An Automatic Synchronization Method for Distributed Power Electronics System

Currently, the high-speed serial fiber-optic ring net communication is a main method for performing the distributed control network topology and control mode. Because of a network transmission delay inherent in the topology, synchronization between nodes has become a critical issue which needs to be studied. The existing synchronization methods largely depend on the complex communication protocol. Therefore, this paper has proposed a method of automatic measurement and compensation of synchronization delay, and analyzed its operating principle and implementation procedure in detail. The results obtained from the experiments prove the proposed method to be correct, effective and practicable.

Automatic Generation Control in a Distributed Power Grid Based on Multi-step Reinforcement Learning

The increasing use of renewable energy in the power system results in strong stochastic disturbances and degrades the control performance of the distributed power grids.In this paper,a novel multi-agent collaborative reinforcement learning algorithm is proposed with automatic optimization,namely,Dyna-DQL,to quickly achieve an optimal coordination solution for the multi-area distributed power grids.The proposed Dyna framework is combined with double Q-learning to collect and store the environmental samples.This can iteratively update the agents through buffer replay and real-time data.Thus the environmental data can be fully used to enhance the learning speed of the agents.This mitigates the negative impact of heavy stochastic disturbances caused by the integration of renewable energy on the control performance.Simulations are conducted on two different models to validate the effectiveness of the proposed algorithm.The results demonstrate that the proposed Dyna-DQL algorithm exhibits superior stability and robustness compared to other reinforcement learning algorithms.

PlantScape System—新一代DCS及其在电厂中的应用

总结了美国霍尼韦尔公司采用最新计算机网络技术开发出来的网络监控软件———SCAN30 0 0NT网络平台与新一代控制器S90 0 0组成的PlantScapeSystem ,即新一代DCS的系统结构及其主要特点 ,阐述了其在电厂管理、监视与控制系统中的应用情况 .

Automatic Generation Control of Multi-area Power System with Network Constraints and Communication Delays

Newly proposed power system control methodologies combine economic dispatch(ED) and automatic generation control(AGC) to achieve the steady-state cost-optimal solution under stochastic operation conditions. However, a real power system is subjected to continuous demand disturbance and system constraints due to the input saturation, communication delays and unmeasurable feed-forward load disturbances. Therefore, optimizing the dynamic response under practical conditions is equally important. This paper proposes a state constrained distributed model predictive control(SCDMPC)scheme for the optimal frequency regulation of an interconnected power system under actual operation conditions, which exist due to the governor saturation, generation rate constraints(GRCs), communication delays, and unmeasured feed-forward load disturbances. In addition, it proposes an algorithm to handle the solution infeasibility within the SCDMPC scheme, when the input and state constraints are conflicting. The proposed SCDMPC scheme is then tested with numerical studies on a three-area interconnected network. The results show that the proposed scheme gives better control and cost performance for both steady state and dynamic state in comparison to the traditional distributed model predictive control(MPC) schemes.

Impact of Islanding on Governor Signal of Distributed Resources

Technical and economical impacts of distributed resources have encouraged big industry managers and distribution systems’ owners to utilize small type of electric generations. One important preventive issue to develop these units is islanding situation. Expert diagnosis system is needed to distinguish network cut off from normal occurrences. It should detect islanding in time to disconnect the unit and prevent any additional failures in equipment. An important part of synchronous generator is automatic load-frequency controller (ALFC). This controller is designed properly to respond to load variations and to fix frequency at constant value when working alone as an islanding system and to control output power when operating in parallel with the main. In this paper, a new approach based on monitoring ALFC re-sponse with regard to input signal to governor is introduced. Numbers of initial crossing value are introduced as an index for islanding detection. Simulation results show that input signal to governor has different characteristics in common disturbances.

Network Integration of Distributed Optical Fiber Temperature Sensor

The integration of distributed optical fiber temperature sensor with supervisory control and data acquisition （SCADA） system is proposed and implemented. In the implementation of the integration, both the compatibility with traditional system and the characteristics of distributed optical fiber temperature sensor is considered before Modbus TCP/IP protocol is chosen. The protocol is implemented with open source component Indy. The Modbus TCP/IP protocol used in the system is proved to be fast and robust.

Three Projects of Intelligent Distribution Automation System in East Asia

Intelligent distribution automation system （IDAS） was developed based on distribution automation system that was installed in all distribution offices of Korea. IDAS was designed the combined system with the function of supervisory control and data acquisition （SCADA） and distribution automation system （DAS） for network operation from substation to high voltage customer, and it has been installed in Vietnam, China and Indonesia. This paper explains the project scope, system configuration, and the function of each sy stem.

配电网多馈线负荷协同的直控型虚拟电厂自动功率控制

配电网内具有有功快速调节能力的分布式资源及柔性负荷的增多,为电网运行控制提供了新的方式。研究了配电网多馈线负荷协同的直控型虚拟电厂自动功率控制策略,实现了对自动功率控制指令的主动跟踪。首先,分析了馈线负荷调节特性,建立了基于电能质量等级的调控成本模型,并考虑广泛存在的分布式资源,构建了计及多类型有功资源调节潜力的直控型虚拟电厂。其次,构建了分布式资源聚合与控制指令分解模型,通过聚类算法实现资源分群,并基于经济性原则分解聚合体控制指令;构建了基于解析电压灵敏度的多类型有功调节资源协同优化模型,以确定自动功率控制指令的分解策略。最后,结合MATLAB和实时数字仿真(RTDS)平台搭建中国广东某区域实际配电网仿真模型,验证了所提策略的有效性。

烧碱浓度在线检测与自动配碱控制系统的研究

为了解决印染丝光加工过程中,烧碱浓度不稳定对织物染色加工质量的影响,开发一种浓碱浓度在线检测与自动配碱控制系统,解决了传统印染丝光人工配碱、浓度滴定控制方式存在的弊端。

计及调频能力和经济效益的储能集群多状态区间优化策略

可再生能源发电系统的快速增长使得电力系统的频率安全面临着挑战。针对分布式储能集群二次调频过程中所面临的问题,提出一种计及调频能力和经济效益的储能集群多状态区间优化策略。该策略依据荷电状态将所有储能单元划分为多个状态区间,再结合自动发电控制指令及各区间的极限功率确定优化区间。针对非优化区间内的单元,输出功率直接由出力优先级确定;针对优化区间内的单元,利用反映调频成本和整体荷电状态的目标函数及约束条件完成最优求解,从而确定输出功率。仿真结果表明,所提策略能大大减小控制中心的运算量,功率分配结果能有效提升储能集群的二次调频能力,同时提升储能集群的经济效益。

新型电力系统中异质调频机组分布式协同AGC方法研究

“双碳”目标的实施加速了新型电力系统发展。然而,新型电力系统的转动惯量和调节能力逐渐难以适应复杂多变的负荷变化。因此,开发更高效、更快速的调频资源参与自动发电控制(automatic generation control,AGC)已成为刻不容缓之事。但是,不同调频机组之间的异质性显著,包括机组模型、容量和响应速度的差异,这对AGC提出了挑战。为了提升异质调频资源参与AGC的性能,该文提出了一种分布式协同AGC方法。首先,基于分布式固定时间一致性理论提出了一种分布式固定时间区域控制偏差(area control error,ACE)发掘算法。随后,各AGC机组根据获取的ACE信息设计独立的PI控制器参与频率调节。在ACE调节的最后阶段,根据各机组出力的标幺值,设计了分布式固定时间功率均分控制器,控制低速AGC机组承担更多的功率调整量,从而释放高速AGC机组的容量并为下一轮AGC服务做好准备。通过对包含5种不同调频单元的两区域电力系统进行仿真研究,验证了所提分布式协同AGC方法的性能。结果表明,所提方法可以有效地提高系统的调频性能,且能够在设计的时间内实现期望的有功功率分配。

花瓣型配电网区域备自投系统控制策略优化研究及应用

针对花瓣型配电网发生故障后,若故障无法被保护可靠隔离时会导致区域备自投系统无法实现“花瓣”恢复供电的问题,基于控制策略对等式的思想,提出一种新型区域备自投系统控制策略。新型控制策略主动进行故障隔离并通过相邻开关房的信息交互,实现“花瓣”的恢复供电及恢复供电后线路过载时各开关房中负荷的智能选切功能,通过信息交互也确保了安全稳定系统切负荷功能的有效性;同时提出了经主保护闭锁的后备保护,解决了“花瓣”内合环运行时后备保护定值整定配合困难和工作量大的技术问题。现场应用结果验证了新型控制策略的有效性,对其他配电网区域备自投系统控制策略的研究具有一定的借鉴意义。

玉米烘干自动监控系统设计

谷物干燥监控系统可以实时监测谷物烘干过程中的温度、湿度等关键参数,保证谷物在烘干过程中达到理想的水分含量,从而保证产品质量和食品安全。为提高玉米烘干效率,对玉米烘干过程进行监控。该文提出一种基于DCS的玉米烘干自动监控系统的设计,对输入模块、监控模块和输出模块进行设计,建立实时监测和报警机制,同时结合先进的自动化控制技术,能够有效提高烘干效率,降低能源消耗,提升生产质量,具有重要的应用价值和推广前景。

天然气自动分输系统瞬态控制性能与接驳管道参数相关性研究

随着自动化与智能化技术的发展,天然气分输站场正逐步普及自动分输控制系统。首先通过研究某天然气管道公司供气用户的类型,选取了三类经典用户,并统计整理每类用户的用气组分、分输压力、分输流量等数据,作为建模基础。然后分析主要设备的数学模型,建立分输仿真模型并分析接驳管道的结构参数与该系统瞬态控制性能指标之间的关系。经过对比发现,接驳管线的管径与长度对该系统的瞬态控制性能有显著影响,管线存在临界管径与临界长度,在这两个参数临界值前后,该系统瞬态性能指标的变化趋势不同。

酒钢265 m^(2)烧结机风量控制优化应用

在传统的钢铁行业中自动化、数字化、智能化的应用是降本增效的有效手段,也是传统产业继续发展的必然趋势。本研究通过烧结机风量分布的自动控制及烧结机密封板的拓展应用,降低了烧结机有害漏风,优化了烧结机风量分布,有效提升了烧结矿产、质量。

疾控中心三级生物安全实验室电气设计探讨

结合上海市疾病预防控制中心新建项目,论述疾控中心三级生物安全实验室概况、特点并分析其电气设计要点,包括实验室供配电设计、电气管线敷设原则、电气消防设计、工艺设备及其辅助设备(送排风机、水处理设备等)备用电源设置、自动控制要点等。

DCS在电除尘系统自动控制的应用研究

传统的电除尘器自动控制系统采用可编程逻辑控制器(PLC)控制,其逻辑复杂、可读性差、可维护性低。PLC系统无法与主控系统完成一体化,导致工艺上的割裂,额外地增加了运维成本。本文提出了一种基于分散控制系统(DCS)的电除尘器自动控制方案。

酒厂用起重机智能化控制的应用

针对当前酿酒行业普遍存在的起重机智能化应用不足的问题,本文旨在通过对传统酿酒车间中使用的起重机进行智能化操作技术和自动定位技术的应用与改造,利用现代技术检测、分析酒糟堆表面的三维扫描数据信息情况来改善投料操作,有效提高起重机的工作效率,对现代酒厂中智能化控制起重机的安全运行与日常维护提供有效技术支持。

输配电工程中自动化控制技术的应用分析

随着现代社会对电力需求的不断增长,输配电工程作为电力系统中至关重要的组成部分,承载着保障能源供应、推动工业发展的重要责任。为了适应电力系统规模的不断扩大以及更为复杂的运行环境,自动化控制技术在输配电工程中的应用变得愈发重要。文章探讨了自动化控制技术在输配电系统中的广泛应用,揭示了其在提高系统效率、降低运行风险、推动智能化发展等方面所发挥的关键作用。

配电自动化终端自动验收系统的研制

针对配电自动化终端人工验收方式的耗时长、易出错、效率低等问题,提出一种能够实现信息自动验收系统,通过调度主站控制现场设备,实现程控加量、结果反馈、自动比对等功能,大大缩短配电自动化终端信息验收时间,提高配电网供电可靠性,具有一定的推广应用价值。