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Model switching method of multi-hierarchical model predictive control system 被引量:1
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作者 刘琳琳 周立芳 《化工学报》 EI CAS CSCD 北大核心 2012年第4期1132-1139,共8页
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Simulation realization of skip cycle mode integrated control circuit in the switching power supply with low standby loss 被引量:2
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作者 屈艾文 程东方 冯旭 《Journal of Shanghai University(English Edition)》 CAS 2007年第3期318-322,共5页
This paper explores and proposes a design solution of an integrated skip cycle mode (SCM) control circuit with a simple structure. The design is simulated and implemented with XD10H-1.0μm modular DIMOS 650 V proces... This paper explores and proposes a design solution of an integrated skip cycle mode (SCM) control circuit with a simple structure. The design is simulated and implemented with XD10H-1.0μm modular DIMOS 650 V process. In order to meet the requirement of a wide temperature range and high yields of products, the schematic extracted from the layout is simulated with five process corners at 27℃ and 90℃. Simulation results demonstrate that the proposed integrated circuit is immune to noise and achieves skipping cycle control when switching mode power supply (SMPS) works with low load or without load. 展开更多
关键词 standby loss skip cycle mode (SCM) switching mode power supply (SMPS) integrated control circuit.
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Study of Electromagnetism Compatibility of Single-chip Switching Power Supply and Suppression Technique 被引量:2
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作者 HE Hong JIN Shijiu +3 位作者 ZHANG Dajian MENG Hui ZHU Xianwei TANG Lu 《现代电子技术》 2007年第2期159-161,共3页
As for the Domino effect dv/dt and electromagnetic interference during the rapid switching course of single-chip switching power supply,this article firstly analyzes electromagnetic interference source,and then diagno... As for the Domino effect dv/dt and electromagnetic interference during the rapid switching course of single-chip switching power supply,this article firstly analyzes electromagnetic interference source,and then diagnoses the essential interaction relationship between interference and switching activity based on the timely and area measured waveform,analyzes and studies the production mechanism and coupling path of interference mode,and sets up circuit model according to the features of transverse mode interference and common mode interference.Put forward different suppression methods finally. 展开更多
关键词 switching power electromagnetism compatibility common mode interference transverse mode interference coupling path
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A new high-performance AC/DC power factor correction switching converter based on one-cycle control technology and active floating-charge technology 被引量:3
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作者 高潮 《Journal of Chongqing University》 CAS 2008年第2期119-124,共6页
A new family of converters,high-performance AC/DC power factor correction(PFC) switching converters with one-cycle control technology and active floating-charge technology,was derived and experimentally verified.The t... A new family of converters,high-performance AC/DC power factor correction(PFC) switching converters with one-cycle control technology and active floating-charge technology,was derived and experimentally verified.The topology of a single-phase CCM and DCM Boost-PFC switching converter was also analyzed.Its operating prniciples and control methods were expounded.Based on these,a new type of AC/DC switching converter circuits for PFC combined with one-cycle control technology was presented herein.The proposed AC/DC switching converter significantly helps improve the converter efficiency and its power factor value. 展开更多
关键词 AC/DC converter floating charge technology active power factor correction switching converter
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Impact of switching frequencies on the TID response of SiC power MOSFETs 被引量:2
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作者 Sheng Yang Xiaowen Liang +9 位作者 Jiangwei Cui Qiwen Zheng Jing Sun Mohan Liu Dang Zhang Haonan Feng Xuefeng Yu Chuanfeng Xiang Yudong Li Qi Guo 《Journal of Semiconductors》 EI CAS CSCD 2021年第8期73-76,共4页
Different switching frequencies are required when SiC metal-oxide-semiconductor field-effect transistors(MOSFETs)are switching in a space environment.In this study,the total ionizing dose(TID)responses of SiC power MO... Different switching frequencies are required when SiC metal-oxide-semiconductor field-effect transistors(MOSFETs)are switching in a space environment.In this study,the total ionizing dose(TID)responses of SiC power MOSFETs are investigated under different switching frequencies from 1 kHz to 10 MHz.A significant shift was observed in the threshold voltage as the frequency increased,which resulted in premature failure of the drain-source breakdown voltage and drain-source leakage current.The degradation is attributed to the high activation and low recovery rates of traps at high frequencies.The results of this study suggest that a targeted TID irradiation test evaluation method can be developed according to the actual switching frequency of SiC power MOSFETs. 展开更多
关键词 SiC power MOSFET switching frequency oxide trap total ionizing dose TRANSISTOR semiconductor theory
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Repulsive firefly algorithm-based optimal switching device placement in power distribution systems 被引量:3
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作者 Yuanpeng Tan Hai Chen +4 位作者 Wei Liu Mingze Zhang Yinong Li Xincong Li Hanyang Lin 《Global Energy Interconnection》 2019年第6期490-496,共7页
To achieve optimal configuration of switching devices in a power distribution system,this paper proposes a repulsive firefly algorithm-based optimal switching device placement method.In this method,the influence of te... To achieve optimal configuration of switching devices in a power distribution system,this paper proposes a repulsive firefly algorithm-based optimal switching device placement method.In this method,the influence of territorial repulsion during firefly courtship is considered.The algorithm is practically applied to optimize the position and quantity of switching devices,while avoiding its convergence to the local optimal solution.The experimental simulation results have showed that the proposed repulsive firefly algorithm is feasible and effective,with satisfying global search capability and convergence speed,holding potential applications in setting value calculation of relay protection and distribution network automation control. 展开更多
关键词 power distribution systems switching device Repulsive firefly algorithm Optimal placement RELIABILITY
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Improved One-Cycle Control Algorithm in Five-Phase Six-Leg Switching Power Amplifiers for Magnetic Suspension Bearing 被引量:1
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作者 LIU Chengzi YAN Ting +1 位作者 YANG Yan LIU Zeyuan 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2020年第5期796-803,共8页
For the advantages of easy realization and rapidly intelligent response,the one-cycle control was applied in five-phase six-leg switching power amplifier for magnetic bearing.This paper improves the one-cycle control ... For the advantages of easy realization and rapidly intelligent response,the one-cycle control was applied in five-phase six-leg switching power amplifier for magnetic bearing.This paper improves the one-cycle control considering resistance voltage drop and derives its mathematical models.The improved algorithm is compared with the former one.The simulation and experimental results show that the improved algorithm can effectively reduce the output current ripple,achieve good tracking of the given current,improve the control accuracy,and verify the effectiveness and superiority of the method. 展开更多
关键词 one-cycle control magnetic bearing switching power amplifier voltage drop
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Adaptive Quasi-PID Control Method for Switching Power Amplifiers 被引量:1
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作者 Xiaoming Sun 《Journal of Power and Energy Engineering》 2017年第2期19-44,共26页
Quasi-PID control method that is able to effectively inhibit the inherent tracking error of PI control method is proposed on the basis of a rounded theoretical analysis of a model of switching power amplifiers (SPAs).... Quasi-PID control method that is able to effectively inhibit the inherent tracking error of PI control method is proposed on the basis of a rounded theoretical analysis of a model of switching power amplifiers (SPAs). To avoid the harmful impacts of the circuit parameter variations and the random disturbances on quasi-PID control method, a single neuron is introduced to endow it with self-adaptability. Quasi-PID control method and the single neuron combine with each other perfectly, and their formation is named as single-neuron adaptive quasi-PID control method. Simulation and experimental results show that single-neuron adaptive quasi-PID control method can accurately track both the predictable and the unpredictable waveforms. Quantitative analysis demonstrates that the accuracy of single-neuron adaptive quasi-PID control method is comparable to that of linear power amplifiers (LPAs) and so can fulfill the requirements of some high-accuracy applications, such as protective relay test. Such accuracy is very difficult to be achieved by many modern control methods for converter controls. Compared with other modern control methods, the programming realization of single-neuron adaptive quasi-PID control method is more suitable for real-time applications and realization on low-end microprocessors for its simple structure and lower computational complexity. 展开更多
关键词 switching power AMPLIFIER Quasi-PID CONTROL Method Single NEURON ADAPTIVE CONTROL Protective RELAY Test
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High-power High-efficient and Simplified High-frequency Switching Power Supply for Electrolytic Plating 被引量:6
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作者 MA Fujun LUO An XIAO Huagen 《中国电机工程学报》 EI CSCD 北大核心 2012年第21期I0001-I0022,共22页
针对大功率电解电镀开关电源的输入整流级引起的无功和谐波等电能质量问题,研究了一种基于高效PWM整流的高频开关电源。该电源前级整流器仅用4个开关管来进行PWM整流,后级采用半桥逆变器进行高频变换,显著减少了开关数量。针对三相四开... 针对大功率电解电镀开关电源的输入整流级引起的无功和谐波等电能质量问题,研究了一种基于高效PWM整流的高频开关电源。该电源前级整流器仅用4个开关管来进行PWM整流,后级采用半桥逆变器进行高频变换,显著减少了开关数量。针对三相四开关PWM整流器,推导一种基于开关模型的无差拍控制方法,该方法可实现系统的快速、无差整流。针对多台开关电源的并联均流问题,提出一种基于虚拟阻抗的自均流控制方法,可实现多台电源的均流稳定运行。通过仿真与实验验证了所提结构和控制方法的正确性。 展开更多
关键词 高频开关电源 电镀电源 电解 PWM整流器 高功率 半桥式逆变器 电能质量 HSPS
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Consensus of high-order dynamic multi-agent systems with switching topology and time-varying delays 被引量:11
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作者 Fangcui JIANG,Long WANG,Guangming XIE(Institute of Intelligent Engineering,Center for Systems and Control,College of Engineering,and Key Laboratory of Machine Perception(Ministry of Education),Peking University,Beijing 100871,China) 《控制理论与应用(英文版)》 EI 2010年第1期52-60,共9页
This paper studies the consensus problems for a group of agents with switching topology and time-varying communication delays, where the dynamics of agents is modeled as a high-order integrator. A linear distributed c... This paper studies the consensus problems for a group of agents with switching topology and time-varying communication delays, where the dynamics of agents is modeled as a high-order integrator. A linear distributed consensus protocol is proposed, which only depends on the agent's own information and its neighbors' partial information. By introducing a decomposition of the state vector and performing a state space transformation, the closed-loop dynamics of the multi-agent system is converted into two decoupled subsystems. Based on the decoupled subsystems, some sufficient conditions for the convergence to consensus are established, which provide the upper bounds on the admissible communication delays. Also, the explicit expression of the consensus state is derived. Moreover, the results on the consensus seeking of the group of high-order agents have been extended to a network of agents with dynamics modeled as a completely controllable linear time-invariant system. It is proved that the convergence to consensus of this network is equivalent to that of the group of high-order agents. Finally, some numerical examples are given to demonstrate the effectiveness of the main results. 展开更多
关键词 Consensus problems Distributed control multi-agent systems switching topology Time-varying delays Lyapunov-Krasovskii approach
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Consensus problem of second-order multi-agent systems with time-varying communication delay and switching topology 被引量:8
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作者 Chenglin Liu Fei Liu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2011年第4期672-678,共7页
Leader-following stationary consensus problem is investigated for the second-order multi-agent systems with timevarying communication delay and switching topology. Based on Lyapunov-Krasovskii functional and Lyapunov-... Leader-following stationary consensus problem is investigated for the second-order multi-agent systems with timevarying communication delay and switching topology. Based on Lyapunov-Krasovskii functional and Lyapunov-Razumikhin functions respectively, consensus criterions in the form of linear matrix inequality (LMI) are obtained for the system with time-varying communication delays under static interconnection topology con- verging to the leader's states. Moreover, the delay-dependent consensus criterion in the form of LMI is also obtained for the system with time-invariant communication delay and switching topologies by constructing Lyapunov-Krasovskii functional. Numerical simulations present the correctness of the results. 展开更多
关键词 second-order multi-agent system time-varyingcommunication delay switching topology Lyapunov-Krasovskii Lyapunov-Razumikhin.
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Multi-agent consensus with time-varying delays and switching topologies 被引量:3
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作者 Jia Wei Huajing Fang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2014年第3期489-495,共7页
The consensus problems of multi-agents with time-varying delays and switching topologies are studied. First, assume that an agent receives state information from its neighbors with fixed communication delays and proce... The consensus problems of multi-agents with time-varying delays and switching topologies are studied. First, assume that an agent receives state information from its neighbors with fixed communication delays and processes its own state information with time-varying self-delay respectively. The state time-delay feedback is introduced into the existing consensus protocol to begenerate an improved protocol. Then a sufficient condition is derived which can make the system with time-varying self-delays achieve the consensus. On this basis, a specific form of consensus equilibrium influenced by the initial states of agents, time-delays and state feedback intensity is figured out. In addition, the multi-agent consensus is considered with time-varying topologies. Finally, simulations are presented to il ustrate the validity of theoretical results. 展开更多
关键词 CONSENSUS multi-agent system time-varying delay switching topology convergence analysis.
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Reducing the minimum output power of soft-switching inverter arc welding power supplies 被引量:1
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作者 傅强 薛松柏 《China Welding》 EI CAS 2010年第3期45-49,共5页
The full-bridge zero-voltage and zero-current switching inverter, which can adjust the output power by keeping the duty-cycle of lagging arm constant, changing the duty-cycle of leading arm, is a common circuit topolo... The full-bridge zero-voltage and zero-current switching inverter, which can adjust the output power by keeping the duty-cycle of lagging arm constant, changing the duty-cycle of leading arm, is a common circuit topology of soft-switching inverter arc welding power supplies. However, the output power still remains a certain value when the duty-cycle of leading arm decreases to zero. The working-mode of soft-switching inverter and the waveforms of major parameters with the condition of duty-cycle of leading arm being zero are studied in this paper. U-1 characteristic experiments prove that the minimum output power of soft-switching circuit, which depends on the charged voltage of capacitors in parallel with leading arm, can be decreased by reducing the duty-cycle of lagging arm. By switching working-modes between half-bridge and full-bridge, the output power can swing from zero to the power rating. 展开更多
关键词 SOFT-switching inverter arc welding power supplies minimum output power
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H_∞ couple-group consensus of stochastic multi-agent systems with fixed and Markovian switching communication topologies 被引量:1
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作者 Muyun Fang Cancan Zhou +2 位作者 Xin Huang Xiao Li Jianping Zhou 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第1期313-322,共10页
The paper addresses the issue of H_∞ couple-group consensus for a class of discrete-time stochastic multi-agent systems via output-feedback control. Both fixed and Markovian switching communication topologies are con... The paper addresses the issue of H_∞ couple-group consensus for a class of discrete-time stochastic multi-agent systems via output-feedback control. Both fixed and Markovian switching communication topologies are considered. By employing linear transformations, the closed-loop systems are converted into reduced-order systems and the H_∞ couplegroup consensus issue under consideration is changed into a stochastic H_∞ control problem. New conditions for the mean-square asymptotic stability and H_∞ performance of the reduced-order systems are proposed. On the basis of these conditions, constructive approaches for the design of the output-feedback control protocols are developed for the fixed communication topology and the Markovian switching communication topologies, respectively. Finally, two numerical examples are given to illustrate the applicability of the present design approaches. 展开更多
关键词 multi-agent system couple-group CONSENSUS output feedback control switching TOPOLOGIES
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Average Dwell-time Conditions for Consensus of Discrete-time Linear Multi-agent Systems with Switching Topologies and Time-varying Delays 被引量:4
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作者 GE Yan-Rong CHEN Yang-Zhou ZHANG Ya-Xiao 《自动化学报》 EI CSCD 北大核心 2014年第11期2609-2617,共9页
关键词 平均停留时间 拓扑结构 多AGENT系统 线性变换 时变延迟 离散时间 LYAPUNOV泛函 线性矩阵不等式
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Hybrid-triggered consensus for multi-agent systems with time-delays,uncertain switching topologies, and stochastic cyber-attacks 被引量:1
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作者 Xia Chen Li-Yuan Yin +1 位作者 Yong-Tai Liu Hao Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第9期131-144,共14页
We propose a new approach to discuss the consensus problem of multi-agent systems with time-varying delayed control inputs, switching topologies, and stochastic cyber-attacks under hybrid-triggered mechanism.A Bernoul... We propose a new approach to discuss the consensus problem of multi-agent systems with time-varying delayed control inputs, switching topologies, and stochastic cyber-attacks under hybrid-triggered mechanism.A Bernoulli variable is used to describe the hybrid-triggered scheme, which is introduced to alleviate the burden of the network.The mathematical model of the closed-loop control system is established by taking the influences of time-varying delayed control inputs,switching topologies, and stochastic cyber-attacks into account under the hybrid-triggered scheme.A theorem as the main result is given to make the system consistent based on the theory of Lyapunov stability and linear matrix inequality.Markov jumps with uncertain rates of transitions are applied to describe the switch of topologies.Finally, a simulation example demonstrates the feasibility of the theory in this paper. 展开更多
关键词 hybrid-triggered CONSENSUS multi-agent system time-delay and cyber-attacks switching TOPOLOGIES
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Controlling the output power of soft switching arc welding inverter by two-stage continuous PWM method
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作者 傅强 赵善麒 范新南 《China Welding》 EI CAS 2016年第1期64-70,共7页
The full bridge zero voltage zero current switching ( FB-ZVZCS ) , which could adjust the output power by keeping the duty ratio of lagging leg constant and changing the duty ratio of leading leg, was a common circu... The full bridge zero voltage zero current switching ( FB-ZVZCS ) , which could adjust the output power by keeping the duty ratio of lagging leg constant and changing the duty ratio of leading leg, was a common circuit of soft switching arc welding inverter power source. However, when the duty ratio of leading leg was reduced to zero, the output power stayed the constant value instead of becoming zero. The working status and waveforms of some major parameters were studied in this paper while the duty ratio of leading leg was zero. It was concluded that the minimum output power of soft switching inverter was related to the charging voltage of paraUel capacitors, and the output power also could be reduced by reducing the duty ratio of lagging leg. A novel two-stage continuous PWM control method that could switch working-mode between full bridge and half bridge was put forward in this paper. This kind of control method could further reduce the output power of soft switching inverter in order to meet the requirement of low heat input of sheet metal welding. 展开更多
关键词 soft switching inverter arc welding power source minimum output power two stage continuous PWM control
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Soft switching arc welding power source using output inductor as resonant inductor
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作者 陈树君 王军 +1 位作者 卢振洋 殷树言 《China Welding》 EI CAS 2002年第2期109-113,共5页
Full bridge Zero Voltage Switch PWM converter combines advantages of the PWM control technique and resonant technique. However, Full ZVS is achieved only under large load current because resonant tank of this circu... Full bridge Zero Voltage Switch PWM converter combines advantages of the PWM control technique and resonant technique. However, Full ZVS is achieved only under large load current because resonant tank of this circuit is made up of the parasitic capacitance of the power semiconductors and the leakage inductor of the transformer primary. In this paper two saturable inductors as magnetic switches are added to secondary, so output inductor is always reflected to primary and assists resonant transition. Full ZVS is achieved under lower load current. The above mentioned investigated results are validated by the computerized simulation and hardware circuit experiment. 展开更多
关键词 arc welding inverter power source soft switching resonant inductor computerized simulation
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Analysis of Switching Overvoltage in Regional Grid with Small Hydropower Plants
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作者 Juan Chen Haifeng Li 《Engineering(科研)》 2013年第9期19-23,共5页
Present-day small hydropower plants (SHPs) have a large development potential because of the increasing interest in renewable resources and distributed energy generation, therefore, there are many SHPs in places of Ch... Present-day small hydropower plants (SHPs) have a large development potential because of the increasing interest in renewable resources and distributed energy generation, therefore, there are many SHPs in places of China where are rich in water resources. However, it has caused overvoltages in the distribution network, and which is even worse for the switching overvoltage such as isolated network operation, changing power supply path. The simple network model is used to analyze the reasons of the switching overvoltage, and the simulation software DIgSILENT/PowerFactory is used to check out the results of the theoretical analysis. 展开更多
关键词 Small HYDROpower ISOLATED Operation CHANGING power Supply PATH switching OVERVOLTAGE
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Effect of Switching Devices on Power Quality and Transient Voltage Suppression Using Capacitor Bank Model
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作者 Isaac Kofi Mensah Prah Joseph Cudjoe Attachie 《Journal of Power and Energy Engineering》 2022年第5期77-89,共13页
The main purpose of the electrical power system is to transport and distribute energy generated by the central power plants in a safe and reliable manner to the customer premises. Most of the electrical equipment is e... The main purpose of the electrical power system is to transport and distribute energy generated by the central power plants in a safe and reliable manner to the customer premises. Most of the electrical equipment is exposed within the open which suggests they can be vulnerable to lightning strikes, road dwindling, windstorms, and a few engineering activities with the potential of causing different degrees of damage to the electrical equipment. One of the ways to guard the equipment is to deploy switching devices. However, the operations of most of these switching devices produce oscillatory transient in the electrical transmission and distribution systems which result in voltage, current, and frequency fluctuations in the load. This paper investigates the effect of switching devices on power quality and proposes a positive sequence voltage power transient suppression technique that can spontaneously improve the distorted voltage at the instant of capacitor switching using the capacitor line model as a case study. MATLAB/Simulink software was utilized for the analysis on an electrical network model with bus voltages of 69 kV/12.47 kV and 480 V. The results showed that, during switching operations, the positive sequence voltage power detector block produces ripple-free accurate results. 展开更多
关键词 Capacitor Banks Inrush Current Laplace Transform power Quality Posi-tive Sequence switching Transient Voltage
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