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Real-time Feed-forward Force Compensation for Active Magnetic Bearings System Based on H∞ Controller 被引量:11
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作者 GAO Hui XU Longxiang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2011年第1期58-66,共9页
There are two kinds of unbalance vibrations—force vibration and displacement vibration due to the existence of unbalance excitation in active magnetic bearings(AMB) system. And two unbalance compensation methods—c... There are two kinds of unbalance vibrations—force vibration and displacement vibration due to the existence of unbalance excitation in active magnetic bearings(AMB) system. And two unbalance compensation methods—closed-loop feedback and open loop feed-forward are presented to reduce the force vibration. The transfer function order of the control system directly influencing the system stability will be increased when the closed-loop method is adopted, which makes the real-time compensation not easily achieved. While the open loop method would not increase the primary transfer function order, it provides conditions for real-time compensation. But the real-time compensation signals are not easy to be obtained in the open loop method. To implement real-time force compensation, a new method is proposed to reduce the force vibration caused by the rotor unbalance on the basis of AMB active control. The method realizes real-time and on-line force auto-compensation based on H∞ controller and one novel feed-forward compensation controller, which makes the rotor rotate around its inertia axis. The time-variable feed-forward compensatory signal is provided by a modified adaptive variable step-size least mean square(VSLMS) algorithm. And the relevant least mean square(LMS) algorithm parameters are used to solve the H∞ controller weighting functions. The simulation of the new method to compensate some frequency-variable and sinusoidal signals is completed by MATLAB programming, and real-time compensation is implemented in the actual AMB experimental system. The simulation and experiment results show that the compensation scheme can improve the robust stability and the anti-interference ability of the whole AMB system by using H∞ controller to achieve close-loop control, and then real-time force unbalance compensation is implemented. The proposed research provides a new control strategy containing real-time algorithm and H∞ controller for the force compensation of AMB system. And the stability of the control system is finally improved. 展开更多
关键词 active magnetic bearings H∞ robust controller sensitivity and complementary sensitivity VSLMS algorithm feed-forward compensation
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Dynamic Velocity Feed-Forward Compensation Control with RBF-NN System Identification for Industrial Robots 被引量:1
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作者 宋伟科 肖聚亮 +1 位作者 王刚 王国栋 《Transactions of Tianjin University》 EI CAS 2013年第2期118-126,共9页
A dynamic velocity feed-forward compensation (RBF-NN) dynamic model identification was presented for control (DVFCC) approach with RBF neural network the adaptive trajectory tracking of industrial robots. The prop... A dynamic velocity feed-forward compensation (RBF-NN) dynamic model identification was presented for control (DVFCC) approach with RBF neural network the adaptive trajectory tracking of industrial robots. The proposed control approach combined the advantages of traditional feedback closed-loop position control and computed torque control based on inverse dynamic model. The feed-forward compensator used a nominal robot dynamics as accurate dynamic model and on-line identification with RBF-NN as uncertain part to improve dynamic modeling accu- racy. The proposed compensation was applied as velocity feed-forward by an inverse velocity controller that can con- vert torque signal into velocity in the standard industrial controller. Then, the need for a torque control interface was avoided in the real-time dynamic control of industrial robot. The simulations and experiments were carried out on a gas cutting manipulator. The results show that the proposed control approach can reduce steady-state error, suppress overshoot and enhance tracking accuracy and efficiency in joint space and Cartesian space, especially under high- speed condition. 展开更多
关键词 dynamic velocity feed-forward compensation control RBF-NN inverse velocity controller gas cutting manipulator
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Comparative study of effectiveness of different var compensation devices in large-scale power networks 被引量:3
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作者 Reza Sirjani Azah Mohamed Hussain Shareef 《Journal of Central South University》 SCIE EI CAS 2013年第3期715-723,共9页
A comparison of the effectiveness of installing reactive power compensators,such as shunt capacitors,static var compensators(SVCs),and static synchronous compensators(STATCOMs),was presented in large-scale power netwo... A comparison of the effectiveness of installing reactive power compensators,such as shunt capacitors,static var compensators(SVCs),and static synchronous compensators(STATCOMs),was presented in large-scale power networks.A suitable bus was first identified using modal analysis method.The single shunt capacitor,single SVC,and single STATCOM were installed separately on the most critical bus.The effects of the installation of different devices on power loss reduction,voltage profile improvement,and voltage stability margin enhancement were examined and compared for 57-and 118-bus transmission systems.The comparative study results show that SVC,and STATCOM are expensive compared to shunt capacitor,yet the effect of installing STATCOM is better than SVC and the effect of installing SVC is better than that of shunt capacitor in achieving power loss reduction,voltage profile improvement and voltage stability margin enhancement. 展开更多
关键词 shunt capacitor static var compensator static synchronous compensator power loss voltage profile voltage stability
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ADAPTIVE FEED-FORWARD COMPENSATOR FOR HARMONIC CANCELLATION IN ELECTRO-HYDRAULIC SERVO SYSTEM 被引量:3
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作者 YAO Jianjun WANG Liquan +2 位作者 JIANG Hongzhou WU Zhenshun HAN Junwei 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2008年第1期77-81,共5页
Since the dead zone phenomenon occurs in electro-hydraulic servo system, the output of the system corresponding to a sinusoidal input contains higher harmonic besides the fundamental input, which causes harmonic disto... Since the dead zone phenomenon occurs in electro-hydraulic servo system, the output of the system corresponding to a sinusoidal input contains higher harmonic besides the fundamental input, which causes harmonic distortion of the output signal. The method for harmonic cancellation based on adaptive filter is proposed. The task is accomplished by generating reference signals with frequency that should be eliminated from the output. The reference inputs are weighted by the adaptive filter in such a way that it closely matches the harmonic. The output of the adaptive filter is a harmonic replica and is injected to the fundamental signal such that the output harmonic is cancelled leaving the desired signal alone, and the total harmonic distortion (THD) is greatly reduced. The weights of filter are adjusted on-line according to the control error by using least-mean-square (LMS) algorithm. Simulation results performed with a hydraulic system demonstrate the efficiency and validity of the proposed adaptive feed-forward compensator (AFC) control scheme 展开更多
关键词 Adaptive filter Adaptive feed-forward compensator Least-mean-square algorithm Dead zone Harmonic distortion
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Hybrid compensation method for traction power quality compensators in electrified railway power supply system 被引量:1
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作者 Mohammad Arabahmadi Mahdi Banejad Ali Dastfan 《Global Energy Interconnection》 CAS CSCD 2021年第2期158-168,共11页
In order to improve the Power Quality(PQ)of traction power supply system and reduce the power rating and operation cost of compensator,a Static VAR Compensator(SVC)integrated Railway Power Conditioner(RPC)is presented... In order to improve the Power Quality(PQ)of traction power supply system and reduce the power rating and operation cost of compensator,a Static VAR Compensator(SVC)integrated Railway Power Conditioner(RPC)is presented in this paper.RPC is a widely used device in the AC electrified railway systems to enhance the PQ indices of the main network.The next generation of this equipment is Active Power Quality Compensator(APQC).The major concern of these compensators is their high kVA rating.In this paper,a hybrid technique is proposed to solve aforementioned problems.A combination of SVC as an auxiliary device is employed together with the main compensators,i.e.,RPC and APQC that leads on to the reduction of power rating of the main compensators.The use of proposed scheme will cause to reduce significantly the initial investment cost of compensation system.The main compensators are only utilized to balance active powers of two adjacent feeder sections and suppress harmonic currents.The SVCs are used to compensate reactive power and suppress the third and fifth harmonic currents.In this paper firstly,the PQ compensation procedure in AC electrified railway is analyzed step by step.Then,the control strategies for SVC and the main compensators are presented.Finally,a simulation is fulfilled using Matlab/Simulink software to verify the effectiveness and validity of the proposed scheme and compensation strategy and also demonstrate that this technique could compensate all PQ problems. 展开更多
关键词 AC electrified railway Power quality compensation Auxiliary compensator static var compensator Power rating reduction of converters
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Fuzzy-GA based algorithm for optimal placement and sizing of distribution static compensator (DSTATCOM) for loss reduction of distribution network considering reconfiguration 被引量:1
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作者 Mohammad Mohammadi Mahyar Abasi A.Mohammadi Rozbahani 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第2期245-258,共14页
This work presents a fuzzy based methodology for distribution system feeder reconfiguration considering DSTATCOM with an objective of minimizing real power loss and operating cost. Installation costs of DSTATCOM devic... This work presents a fuzzy based methodology for distribution system feeder reconfiguration considering DSTATCOM with an objective of minimizing real power loss and operating cost. Installation costs of DSTATCOM devices and the cost of system operation, namely, energy loss cost due to both reconfiguration and DSTATCOM placement, are combined to form the objective function to be minimized. The distribution system tie switches, DSTATCOM location and size have been optimally determined to obtain an appropriate operational condition. In the proposed approach, the fuzzy membership function of loss sensitivity is used for the selection of weak nodes in the power system for the placement of DSTATCOM and the optimal parameter settings of the DFACTS device along with optimal selection of tie switches in reconfiguration process are governed by genetic algorithm(GA). Simulation results on IEEE 33-bus and IEEE 69-bus test systems concluded that the combinatorial method using DSTATCOM and reconfiguration is preferable to reduce power losses to 34.44% for 33-bus system and to 45.43% for 69-bus system. 展开更多
关键词 distribution FACTS (DFACTS) distribution static compensator (DSTATCOM) network reconfiguration genetic algorithm fuzzy membership function power loss reduction
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Applications of Localized Phase Compensation Method to Design a Stabilizer in a Multi-machine Power System 被引量:4
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作者 DU Wenjuan WANG Haifeng CAO Jun 《中国电机工程学报》 EI CSCD 北大核心 2012年第22期I0010-I0010,16,共1页
为了演示和验证稳定器设计的就地相位补偿法在多机电力系统中的应用,介绍在多机电力系统中,就地补偿设计稳定器的2个应用实例。第1个实例是在多机电力系统中就地补偿设计电力系统稳定器(power system stabilizer,PSS),阻尼电力系统局... 为了演示和验证稳定器设计的就地相位补偿法在多机电力系统中的应用,介绍在多机电力系统中,就地补偿设计稳定器的2个应用实例。第1个实例是在多机电力系统中就地补偿设计电力系统稳定器(power system stabilizer,PSS),阻尼电力系统局部模振荡。第2个实例是就地补偿设计附加在静态同步补偿器(static synchronous compensator,STATCOM)上的稳定器,抑制多机电力系统中的区域模振荡,并给出在一个16机电力系统中的应用计算和仿真结果。 展开更多
关键词 稳定剂 相位补偿法 多机系统 设计 应用 多机电力系统 电力系统稳定器 STATCOM
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Research on resonance fault caused by dc magnetic biasing in ultra high voltage transformer with parallel static var compensator
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作者 Yang Nan Zhu Zimin Yuan Tiejiang 《Journal of Southeast University(English Edition)》 EI CAS 2020年第3期301-312,共12页
For dealing with the resonance fault of ultra-high voltage transformers(UHVTs)with the parallel thyristor controlled reactor(TCR)+the filter compensator(FC)type static var compensator(SVC)caused by dc magnetic biasing... For dealing with the resonance fault of ultra-high voltage transformers(UHVTs)with the parallel thyristor controlled reactor(TCR)+the filter compensator(FC)type static var compensator(SVC)caused by dc magnetic biasing,a simulation model of UHVT with parallel SVC for the frequency analysis of the impedance characteristics and a magnetic-field coupling model for UHVT based on classic Jiles-Atherton hysteresis theories are constructed based on the MATLAB/Simulink platform.Both the theoretical and simulation results prove that the resonance fault is caused by the resonance point on the low-voltage side of the transformer,which will approach the 4th harmonic point under magnetic biasing.Based on the fault analysis,a new resonance control method is proposed by adding reactance with by-pass switches in series with FC branches.Under dc magnetic biasing,the cutoff of the by-pass switch will increase the series reactance rate of the FC branches and change the resonance point.In order to avoid the 7th harmonic increasement caused by this method,the firing angle of the TCR branches is locked between 130°and 180°.The effect of the proposed method is validated by the simulation model of a 750 kV UHVT and the results show that the mechanism analysis of the resonance fault is correct and the resonance control method is valid. 展开更多
关键词 static var compensator ultra-high voltage transformer magnetic biasing resonance fault
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Comprehensive Energy-Saving Optimization Model of Asynchronous Motor for Voltage Regulation Based on Static Synchronous Compensator
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作者 Shuqiao Dan 《Energy Engineering》 EI 2022年第3期1047-1057,共11页
There are several problems existing in the direct starting of asynchronous motor such as large starting current,reactive power absorption from network side and weak interference-resistance,etc.Aiming at this,a compreh... There are several problems existing in the direct starting of asynchronous motor such as large starting current,reactive power absorption from network side and weak interference-resistance,etc.Aiming at this,a comprehensive energy-saving optimization model of asynchronous motor for voltage regulation based on static synchronous compensator(STATCOM)is put forward.By analyzing the working principle and operation performance of static synchronous compensator regulating voltage,a new energy-efficient optimization method for asynchronous motor is proposed based on the voltage regulator model to achieve soft start,continuous dynamic reactive power compensation and the terminal voltage stability control.The multi-objective optimal operation of asynchronous motor is realized by controlling the inverter to adjust the reactive current dynamically.The strategy reduces the influence of starting current and grid voltage by soft starting,and realizes the function of reactive power compensation and terminal voltage stabilization.The effectiveness and superiority of the proposed model is verified by the simulation analysis and the results of comparison with the motor started directly. 展开更多
关键词 Asynchronous motor direct starting static synchronous compensator(STATCOM) energy-saving optimization
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Process for Compensating Local Magnetic Perturbations on Ferromagnetic Surfaces
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作者 Antonio Villalba Madrid Alejandro álvarez Melcón 《Journal of Electromagnetic Analysis and Applications》 2012年第10期387-399,共13页
This paper addresses a practical application for the compensation of a local magnetic perturbation in a ship in the near field region. The process will avoid expensive deperming techniques usually applied to ships to ... This paper addresses a practical application for the compensation of a local magnetic perturbation in a ship in the near field region. The process will avoid expensive deperming techniques usually applied to ships to treat magnetic anomalies. The technique includes a new system to construct magnetic maps on flat ferromagnetic surfaces. Once the magnetic maps are obtained, a new system is proposed to evaluate and locate local magnetic perturbations. Once the local perturbations are located, they are compensated by local degaussing coils. The new technique has been applied to the detection of local magnetic perturbations in four naval platforms. Two of them presented important magnetic anomalies, and were successfully detected and corrected by applying the new technique, thus showing its practical value. 展开更多
关键词 GENETIC Algorithms MAGNETIC compensation Optimization Methods MAGNETIC Mapping static MAGNETIC
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抑制分布式静止串联补偿器对线路保护影响的方法研究 被引量:1
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作者 潘磊 马秀达 +3 位作者 林艺哲 谢华 吴飞翔 任铁强 《电力系统保护与控制》 EI CSCD 北大核心 2024年第3期172-179,共8页
分布式静止串联补偿器(distributed static series compensator,DSSC)通过调节注入线路的电压可改变线路功率,优化电网潮流分布。针对现有交流线路保护算法难以适应DSSC串入线路运行的问题,提出了抑制DSSC对线路保护影响的方法。首先,... 分布式静止串联补偿器(distributed static series compensator,DSSC)通过调节注入线路的电压可改变线路功率,优化电网潮流分布。针对现有交流线路保护算法难以适应DSSC串入线路运行的问题,提出了抑制DSSC对线路保护影响的方法。首先,分析了DSSC对交流线路保护的影响,证明了DSSC注入电压可能改变距离保护的阻抗测量值,导致距离保护有拒动或误动的风险。然后,提出了利用DSSC本体过流保护快速将DSSC旁路、或基于故障辅助判据主动将DSSC注入电压降为0的方法,以抑制不同类型的线路故障时DSSC对线路保护的影响。最后,基于硬件在环RTDS实时仿真平台以及浙江湖州DSSC示范工程现场进行试验,验证了所提抑制DSSC对交流线路保护影响的方法的有效性。 展开更多
关键词 分布式静止串联补偿器 线路保护 距离保护
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基于改进TS模糊的直流电弧炉闪变抑制优化
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作者 朱明星 许路遥 高敏 《电力工程技术》 北大核心 2024年第4期136-146,共11页
为提高静止无功补偿器(static var compensator,SVC)应对直流电弧炉等冲击性负载的闪变抑制性能,文中在改进Takagi-Sugeno(TS)模糊算法的基础上,提出一种SVC滚动预测控制方法。首先,建立直流电弧炉电气模型并仿真分析其无功特性;然后,... 为提高静止无功补偿器(static var compensator,SVC)应对直流电弧炉等冲击性负载的闪变抑制性能,文中在改进Takagi-Sugeno(TS)模糊算法的基础上,提出一种SVC滚动预测控制方法。首先,建立直流电弧炉电气模型并仿真分析其无功特性;然后,针对经典TS模糊预测算法应用于波动负荷时出现的输出异常置0情况,提出一种范围自适应修正的改进方法,该方法能消除一类算法应用机理导致的异常值,从而提高TS模糊算法对波动负荷无功功率预测的可靠性和准确性;最后,基于模型训练时间约束,建立无功功率半周期滚动预测控制模型,提前10 ms预测无功功率,改善了SVC传统控制系统响应的滞后特性。仿真结果表明,相比于SVC传统控制方法,所提方法的平均闪变改善率提高了54.17%,验证了所提方法对闪变现象的抑制效果提升显著。 展开更多
关键词 Takagi-Sugeno(TS)模糊算法 直流电弧炉 静止无功补偿器(SVC) 预测控制 异常值修正 闪变抑制
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数字化波浪补偿分离式液压钻机的研制
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作者 梁文成 欧阳志强 +3 位作者 杨兴文 谭颖 周亲宗 雷统平 《地质装备》 2024年第3期6-9,共4页
基于能源绿色、风力大等优势,海上风力发电技术近年来越来越受到重视,正由浅海向深海发展,且小型发电机逐步被大功率发电机取代。海上风力发电中风电场的选址、风机的基础设计、桩基施工、地层测试等,都离不开钻探和井内静力触探技术。... 基于能源绿色、风力大等优势,海上风力发电技术近年来越来越受到重视,正由浅海向深海发展,且小型发电机逐步被大功率发电机取代。海上风力发电中风电场的选址、风机的基础设计、桩基施工、地层测试等,都离不开钻探和井内静力触探技术。为了满足海上勘察钻机的要求,研发了数字化波浪补偿分离式液压钻机,主要是在数字化、自动化、回转、波浪补偿等功能,以及模块化设计、制造工艺等方面进行了创新。通过理论参数核算、海上应用测试、深海生产施工验证,证明该钻机不仅可满足使用需求,并且比常规钻机更加方便管理、高效安全,还降低了钻探的辅助成本。 展开更多
关键词 海上风电 海洋工程勘察钻探 钻孔静力触探 液压钻机 波浪补偿
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小型光电编码器误差自动检测系统
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作者 杜玉康 赵长海 +1 位作者 万秋华 孙树红 《仪表技术与传感器》 CSCD 北大核心 2024年第4期59-63,70,共6页
为了提高小型光电编码器误差检测的精度和效率,拓展编码器误差检测的应用,设计了一种误差检测系统。通过对编码器误差来源分析,以步进电机为动力,DSP芯片为数据采集与电机驱动核心,21位高精度编码器为角度基准,搭建了可进行编码器动态... 为了提高小型光电编码器误差检测的精度和效率,拓展编码器误差检测的应用,设计了一种误差检测系统。通过对编码器误差来源分析,以步进电机为动力,DSP芯片为数据采集与电机驱动核心,21位高精度编码器为角度基准,搭建了可进行编码器动态误差与静态误差自动检测的系统。并通过对误差的分析与拟合,实现了对编码器的误差补偿,提高了被检编码器测量精度。经实际检测验证,所设计编码器误差检测系统达到设计要求。 展开更多
关键词 光电编码器 动态误差 静态误差 自动检测 误差补偿
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基于扰动观测器-Lyapunov理论的稳压控制策略
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作者 张泽宇 宫萍萍 +1 位作者 郭华杰 卢子广 《电力电子技术》 2024年第5期40-43,共4页
针对小型风力自励异步发电机(SEICG)机端电压在投切负载时产生电压跌落的问题,通过并联静止无功补偿器(STATCOM)提高异SEIG的机端特性,改善电能质量。提出一种基于扰动观测器(DOB)的Lyapunov(DOB-Lyapunov)控制策略,通过数学模型构造Lya... 针对小型风力自励异步发电机(SEICG)机端电压在投切负载时产生电压跌落的问题,通过并联静止无功补偿器(STATCOM)提高异SEIG的机端特性,改善电能质量。提出一种基于扰动观测器(DOB)的Lyapunov(DOB-Lyapunov)控制策略,通过数学模型构造Lyapunov函数,将误差跟踪问题转换成求解Lyapunov函数在平衡点全局渐近稳定问题;针对线路电感测量误差及摄动对控制策略造成影响,内环加入DOB,使得整个控制器在鲁棒性、静态稳定性方面得到提升。结果表明:所提DOB-Lyapunov方法可以在线路阻抗发生变化时仍有较好的控制性能,电压平方外环结构实现了线性化电压控制,在响应速度以及总谐波畸变率(THD)方面均优于传统方法。 展开更多
关键词 自励异步发电机 静止无功补偿器 扰动观测器
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附带STATCOM的HVDC系统改进参考电压控制法
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作者 张博航 王涛 顾雪平 《华北电力大学学报(自然科学版)》 CAS 北大核心 2024年第2期80-89,共10页
在弱交流系统下对于附带有STATCOM的电网换相换流器高压直流输电(Line Commutated Converter based High Voltage Direct Current, LCC-HVDC)系统,存在着LCC逆变站与STATCOM之间耦合导致LCC-HVDC系统的稳定裕度下降问题,这会减弱LCC-HVD... 在弱交流系统下对于附带有STATCOM的电网换相换流器高压直流输电(Line Commutated Converter based High Voltage Direct Current, LCC-HVDC)系统,存在着LCC逆变站与STATCOM之间耦合导致LCC-HVDC系统的稳定裕度下降问题,这会减弱LCC-HVDC抑制换相失败的能力。此外,HVDC控制环节之中的电压指令电流控制(voltage dependent current order limiter, VDCOL)环节的输出电流指令大幅剧烈波动还有几率会导致HVDC系统在首次换相失败之后发生后续换相失败。针对上述问题提出了一种“改进参考电压”的思想,对STATCOM和VDCOL的参考电压与输入电压分别进行修正。首先在STATCOM原本的参考电压经过一个“虚拟电抗”之后得到一个新的参考电压,通过这个改进参考电压弱化了STATCOM电压外环控制模块与LCC逆变站的耦合,减小了交流系统等效阻抗的大小,提升了系统对干扰的抵抗能力。然后对VDCOL的输入电压进行改进,新的改进输入电压改善了故障后VDCOL输出电流指令的大幅剧烈波动情况。最后通过三个层次的对照试验,验证了所提方法的有效性。 展开更多
关键词 LCC-HVDC系统 静止同步补偿器 改进参考电压 电压指令电流控制 换相失败
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分布式静止串联补偿器相间协调控制方法
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作者 林艺哲 潘磊 +1 位作者 邹强 董云龙 《电气技术》 2024年第1期72-78,共7页
分布式静止串联补偿器(DSSC)是一种串联型分布式柔性交流输电装置,功率模组串联接入交流线路。为快速、平稳地处理DSSC的各相模组故障,本文提出相间协调控制策略,通过引入热备用控制机制,在三相DSSC的某一相出现模组故障后,将非故障相... 分布式静止串联补偿器(DSSC)是一种串联型分布式柔性交流输电装置,功率模组串联接入交流线路。为快速、平稳地处理DSSC的各相模组故障,本文提出相间协调控制策略,通过引入热备用控制机制,在三相DSSC的某一相出现模组故障后,将非故障相指定模组转为热备用状态并输出零电压,同时提升各相正常模组的输出电压,从而保持DSSC输出总电压不变,在避免对交流电网造成不平衡扰动的同时,保证模组故障不影响线路稳态潮流。在湖州分布式潮流控制器(DPFC)示范工程中,通过开展模组故障模拟试验,验证了相间协调控制方法的可行性和有效性。 展开更多
关键词 分布式静止串联补偿器(DSSC) 模组故障 相间协调控制 热备用控制
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发电机组低负荷下的SVG无功补偿技术应用分析
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作者 罗浩 刘守豹 +5 位作者 汪凤月 曾恕嘉 袁洋 侯俊宏 李宏博 赵国亚 《电工技术》 2024年第8期106-109,共4页
低负荷运行容易导致发电机组无功功率不足、电压不稳定等问题,影响电力系统的稳定性和可靠性。探讨了在发电机组低负荷条件下应用静止无功发生器(SVG)技术进行无功补偿的途径。分析了SVG在维持电压稳定、改善功率因数以及减轻低负荷运... 低负荷运行容易导致发电机组无功功率不足、电压不稳定等问题,影响电力系统的稳定性和可靠性。探讨了在发电机组低负荷条件下应用静止无功发生器(SVG)技术进行无功补偿的途径。分析了SVG在维持电压稳定、改善功率因数以及减轻低负荷运行对发电机组的不良影响等方面的表现和有效性,并通过实验和仿真开展评估验证。 展开更多
关键词 低负荷 无功补偿 SVG技术 电压稳定
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虚拟同步机控制策略下的STATCOM相间电容电压平衡方法研究
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作者 范利 刘惠康 +1 位作者 柴琳 陈天宇 《电力电容器与无功补偿》 2024年第2期44-51,共8页
针对基于直挂式级联H桥拓扑结构的静止同步补偿器在运行时产生的相间电容电压不平衡的问题,本文在虚拟同步机的控制策略基础上提出了一种平衡相间电容电压的方法。虚拟同步机具有响应速度快的优点,但用于静止同步补偿器来作无功补偿时... 针对基于直挂式级联H桥拓扑结构的静止同步补偿器在运行时产生的相间电容电压不平衡的问题,本文在虚拟同步机的控制策略基础上提出了一种平衡相间电容电压的方法。虚拟同步机具有响应速度快的优点,但用于静止同步补偿器来作无功补偿时会产生相间电容电压不平衡的问题。因此本文首先引入电容电压平均值来完成虚拟同步机的快速并网,其次将虚拟同步机算法的无功调节分为3部分来实现分相无功补偿,再在电压合成前引入电容电压平均值作反馈,以实现相间电容电压平衡。最后在Matlab/Simulink环境下搭建仿真模型,验证了所提控制策略能有效解决相间电容电压不平衡问题,并且仿真结果表明所提控制策略具有良好的动态响应特性。 展开更多
关键词 静止同步补偿器 虚拟同步机控制策略 相间电容电压平衡 级联H桥变换器
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一种基于非线性电流跟踪算法的STATCOM相间电容电压平衡控制策略
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作者 闵一博 刘惠康 +2 位作者 陈天宇 柴琳 范利 《电力电容器与无功补偿》 2024年第2期52-62,共11页
针对基于级联H桥拓扑结构的静止同步补偿器在传统控制框架下所产生的相间电容电压不平衡问题,采用一种新型混合调制方法并提出了一种全新的非线性分相电流控制策略。首先,基于六模块十三电平级联H桥拓扑结构,阐明新型混合调制的调制原理... 针对基于级联H桥拓扑结构的静止同步补偿器在传统控制框架下所产生的相间电容电压不平衡问题,采用一种新型混合调制方法并提出了一种全新的非线性分相电流控制策略。首先,基于六模块十三电平级联H桥拓扑结构,阐明新型混合调制的调制原理,并阐述适用于新型混合调制的相内电容电压均衡策略。其次,推导了静止同步补偿器在两相同步旋转坐标系下的控制模型,并分析指出采用dq解耦控制存在的相间电容电压不平衡问题。针对相间电容电压不平衡问题,提出基于三相静止坐标系下的电流分相控制策略,通过Lyapunov稳定性判据第二法推导并设计实现对交流指令电流无差跟踪的非线性电流控制器。最后,在Matlab/Simulink环境下搭建仿真模型。仿真结果表明,所提控制策略在不同条件下均能保持相间电容电压一致和稳定,且具有良好的动态响应特性。 展开更多
关键词 静止同步补偿器 新型混合调制 相间电容电压平衡控制 非线性电流跟踪算法
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