This study presents a comprehensive impact analysis of the rotor angle stability of a proposed international connection between the Philippines and Sabah,Malaysia,as part of the Association of Southeast Asian Nations(...This study presents a comprehensive impact analysis of the rotor angle stability of a proposed international connection between the Philippines and Sabah,Malaysia,as part of the Association of Southeast Asian Nations(ASEAN)Power Grid.This study focuses on modeling and evaluating the dynamic performance of the interconnected system,considering the high penetration of renewable sources.Power flow,small signal stability,and transient stability analyses were conducted to assess the ability of the proposed linked power system models to withstand small and large disturbances,utilizing the Power Systems Analysis Toolbox(PSAT)software in MATLAB.All components used in the model are documented in the PSAT library.Currently,there is a lack of publicly available studies regarding the implementation of this specific system.Additionally,the study investigates the behavior of a system with a high penetration of renewable energy sources.Based on the findings,this study concludes that a system is generally stable when interconnection is realized,given its appropriate location and dynamic component parameters.Furthermore,the critical eigenvalues of the system also exhibited improvement as the renewable energy sources were augmented.展开更多
For a large-scale high voltage direct current (HVDC)asynchronous interconnected power grid, the frequency issue atthe power sending side under DC faults is a crucial problem.To solve this problem, based on rotor motio...For a large-scale high voltage direct current (HVDC)asynchronous interconnected power grid, the frequency issue atthe power sending side under DC faults is a crucial problem.To solve this problem, based on rotor motion equations, theeffect of unbalanced power on the system frequency under DCfaults is analyzed. The characteristics and dynamic developmentprocess of frequencies after the injection of disturbances areanalyzed. In addition, the actions and coordinated strategies ofvarious frequency control measures are also investigated. Basedon the testing projects of an asynchronous interconnection in theChina Southern Power Grid (CSG), the frequency features arestudied according to the measured PMU data. The outcome showsthat the frequency problem of the Yunnan Power Grid after anasynchronous interconnection can be solved and controlled. Italso shows that the frequency limit control (FLC) is importantfor the frequency regulation of large scale HVDC asynchronousinterconnected DC power grids. As demonstrated, DC FLC caneffectively suppress the deviation of the transient frequency.However, reasonable frequency regulation parameters shouldbe set and other area frequency control measures should becoordinated to maintain the frequency stability of the system.展开更多
A novel low-swing interface circuit for high-speed on-chip asynchronous interconnection is proposed in this paper. It takes a differential level-triggered latch to recover digital signal with ultra low-swing voltage l...A novel low-swing interface circuit for high-speed on-chip asynchronous interconnection is proposed in this paper. It takes a differential level-triggered latch to recover digital signal with ultra low-swing voltage less than 50 mV, and the driver part of the interface circuit is optimized for low power using the driver-array method, With a capacity to work up to 500 MHz, the proposed circuit, which is simulated and fabricated using SMIC 0.18-pm 1.8-V digital CMOS technology, consumes less power than previously reported designs.展开更多
The first completely localized DC back-to-back project for asynchronous interconnection between Northwest and Central China plays an important role in realizing national power grid interconnection, spurring indigenous...The first completely localized DC back-to-back project for asynchronous interconnection between Northwest and Central China plays an important role in realizing national power grid interconnection, spurring indigenous manufacturing industries and promoting DC transmission equipment. Insisting on the principle of autonomous innovation, this project was based on domestic forces in every aspect, from engineering organization, system design, equipment completion, engineering design, equipment manufacturing and procurement to construction and debugging. By passing through strict quality control, intermediate supervision and acceptance test and assessment, the project has been proved up to world advanced level.展开更多
随着柔性直流(direct current,DC)异步互联工程相继推进,高水电占比高带来的超低频振荡问题威胁着电力系统频率的稳定。针对超低频振荡现象的发生,提出基于柔性直流输电即电压源换流器的高压直流输电(voltage source converter based hi...随着柔性直流(direct current,DC)异步互联工程相继推进,高水电占比高带来的超低频振荡问题威胁着电力系统频率的稳定。针对超低频振荡现象的发生,提出基于柔性直流输电即电压源换流器的高压直流输电(voltage source converter based high voltage direct current transmission,VSC-HVDC)系统的附加频率控制策略。首先,构建含水电、火电机组的频率响应模型,通过阻尼转矩分析揭示超低频振荡产生机理,明确各类调速器参数以及不同水电占比对系统超低频振荡发生的影响;随后,根据直流电容电压与交流系统频率耦合特性,对换流站参与抑制超低频振荡机理进行研究,提出换流站虚拟惯性与V_(DC)-f下垂的控制方式,并通过约束条件对虚拟惯性与下垂参数进行设计;最后,基于MATLAB/SIMULINK平台搭建含水电、火电机组的负荷频率控制模型,通过对比水轮机参数优化方法验证所提方法的有效性。展开更多
利用储能参与互联电网负荷频率控制(load frequency control,LFC)可有效提升电网的频率韧性。然而,受到荷电状态、突发物理故障等因素影响,储能随机接入或退出可能造成LFC系统结构的不确定变化,不利于控制策略的设计。为此,提出基于异...利用储能参与互联电网负荷频率控制(load frequency control,LFC)可有效提升电网的频率韧性。然而,受到荷电状态、突发物理故障等因素影响,储能随机接入或退出可能造成LFC系统结构的不确定变化,不利于控制策略的设计。为此,提出基于异步切换的自适应LFC策略。首先,预设了一系列储能参与LFC的场景,针对每个场景,通过构造Lyapunov泛函确定控制参数设计约束。其次,针对储能随机接入/退出行为,基于平均驻留时间技术推导控制参数在任意2个场景间切换时的更新准则。最后,以最小化任意2个运行场景间的平均驻留时间为目标,设计基于和声搜索的LFC参数优化方法,有效提升电网对储能随机接入/退出行为的容忍度。仿真结果表明,与不考虑储能接入/退出的方案相比,所提方法有效降低了储能接入/退出行为对LFC系统动态行为的冲击影响。展开更多
The flexible interconnection of microgrids(MGs)adopting back-to-back converters(BTBCs)has emerged as a new development trend in the field of MGs.This approach enables larger-scale integration and higher utilization of...The flexible interconnection of microgrids(MGs)adopting back-to-back converters(BTBCs)has emerged as a new development trend in the field of MGs.This approach enables larger-scale integration and higher utilization of distributed renewable energy sources(RESs).However,their stability characteristics are very different from single MG due to the control characteristics of flexible interconnection.Meanwhile,the uncertainty and stochastic dependence structures of RESs and loads create challenges for stability analysis and cooperative control.In this paper,a probabilistic small-signal stability assessment and cooperative control framework is proposed for interconnected MGs via BTBCs.First,a cooperative control architecture for MGs is constructed.Then,a small-signal model of interconnected MGs via BTBCs containing primary control and secondary control is developed.This model facilitates the analysis of the impacts of BTBCs and various control strategies on the system stability.Subsequently,Copula functions and polynomial chaos expansion(PCE)are combined to achieve the probabilistic small-signal stability assessment.On this basis,the parameters of the cooperative control are optimized,enhancing the robustness of interconnected MGs via BTBCs.Finally,a case of interconnected MGs via BTBCs are built in MATLAB/Simulink to verify the accuracy and effectiveness of the proposed framework.展开更多
文摘This study presents a comprehensive impact analysis of the rotor angle stability of a proposed international connection between the Philippines and Sabah,Malaysia,as part of the Association of Southeast Asian Nations(ASEAN)Power Grid.This study focuses on modeling and evaluating the dynamic performance of the interconnected system,considering the high penetration of renewable sources.Power flow,small signal stability,and transient stability analyses were conducted to assess the ability of the proposed linked power system models to withstand small and large disturbances,utilizing the Power Systems Analysis Toolbox(PSAT)software in MATLAB.All components used in the model are documented in the PSAT library.Currently,there is a lack of publicly available studies regarding the implementation of this specific system.Additionally,the study investigates the behavior of a system with a high penetration of renewable energy sources.Based on the findings,this study concludes that a system is generally stable when interconnection is realized,given its appropriate location and dynamic component parameters.Furthermore,the critical eigenvalues of the system also exhibited improvement as the renewable energy sources were augmented.
文摘For a large-scale high voltage direct current (HVDC)asynchronous interconnected power grid, the frequency issue atthe power sending side under DC faults is a crucial problem.To solve this problem, based on rotor motion equations, theeffect of unbalanced power on the system frequency under DCfaults is analyzed. The characteristics and dynamic developmentprocess of frequencies after the injection of disturbances areanalyzed. In addition, the actions and coordinated strategies ofvarious frequency control measures are also investigated. Basedon the testing projects of an asynchronous interconnection in theChina Southern Power Grid (CSG), the frequency features arestudied according to the measured PMU data. The outcome showsthat the frequency problem of the Yunnan Power Grid after anasynchronous interconnection can be solved and controlled. Italso shows that the frequency limit control (FLC) is importantfor the frequency regulation of large scale HVDC asynchronousinterconnected DC power grids. As demonstrated, DC FLC caneffectively suppress the deviation of the transient frequency.However, reasonable frequency regulation parameters shouldbe set and other area frequency control measures should becoordinated to maintain the frequency stability of the system.
基金the 973 Program of China (Grant No.G1999032903)the National Science Fund for Distinguished Young Scholars (Grant No.60025101)the Major Program of National Natural Science Foundation of China (Grant No.90707002)
文摘A novel low-swing interface circuit for high-speed on-chip asynchronous interconnection is proposed in this paper. It takes a differential level-triggered latch to recover digital signal with ultra low-swing voltage less than 50 mV, and the driver part of the interface circuit is optimized for low power using the driver-array method, With a capacity to work up to 500 MHz, the proposed circuit, which is simulated and fabricated using SMIC 0.18-pm 1.8-V digital CMOS technology, consumes less power than previously reported designs.
文摘The first completely localized DC back-to-back project for asynchronous interconnection between Northwest and Central China plays an important role in realizing national power grid interconnection, spurring indigenous manufacturing industries and promoting DC transmission equipment. Insisting on the principle of autonomous innovation, this project was based on domestic forces in every aspect, from engineering organization, system design, equipment completion, engineering design, equipment manufacturing and procurement to construction and debugging. By passing through strict quality control, intermediate supervision and acceptance test and assessment, the project has been proved up to world advanced level.
文摘随着柔性直流(direct current,DC)异步互联工程相继推进,高水电占比高带来的超低频振荡问题威胁着电力系统频率的稳定。针对超低频振荡现象的发生,提出基于柔性直流输电即电压源换流器的高压直流输电(voltage source converter based high voltage direct current transmission,VSC-HVDC)系统的附加频率控制策略。首先,构建含水电、火电机组的频率响应模型,通过阻尼转矩分析揭示超低频振荡产生机理,明确各类调速器参数以及不同水电占比对系统超低频振荡发生的影响;随后,根据直流电容电压与交流系统频率耦合特性,对换流站参与抑制超低频振荡机理进行研究,提出换流站虚拟惯性与V_(DC)-f下垂的控制方式,并通过约束条件对虚拟惯性与下垂参数进行设计;最后,基于MATLAB/SIMULINK平台搭建含水电、火电机组的负荷频率控制模型,通过对比水轮机参数优化方法验证所提方法的有效性。
文摘利用储能参与互联电网负荷频率控制(load frequency control,LFC)可有效提升电网的频率韧性。然而,受到荷电状态、突发物理故障等因素影响,储能随机接入或退出可能造成LFC系统结构的不确定变化,不利于控制策略的设计。为此,提出基于异步切换的自适应LFC策略。首先,预设了一系列储能参与LFC的场景,针对每个场景,通过构造Lyapunov泛函确定控制参数设计约束。其次,针对储能随机接入/退出行为,基于平均驻留时间技术推导控制参数在任意2个场景间切换时的更新准则。最后,以最小化任意2个运行场景间的平均驻留时间为目标,设计基于和声搜索的LFC参数优化方法,有效提升电网对储能随机接入/退出行为的容忍度。仿真结果表明,与不考虑储能接入/退出的方案相比,所提方法有效降低了储能接入/退出行为对LFC系统动态行为的冲击影响。
基金supported by the National Key R&D Program of China“Response-driven intelligent enhanced analysis and control for bulk power system stability”(No.2021YFB2400800).
文摘The flexible interconnection of microgrids(MGs)adopting back-to-back converters(BTBCs)has emerged as a new development trend in the field of MGs.This approach enables larger-scale integration and higher utilization of distributed renewable energy sources(RESs).However,their stability characteristics are very different from single MG due to the control characteristics of flexible interconnection.Meanwhile,the uncertainty and stochastic dependence structures of RESs and loads create challenges for stability analysis and cooperative control.In this paper,a probabilistic small-signal stability assessment and cooperative control framework is proposed for interconnected MGs via BTBCs.First,a cooperative control architecture for MGs is constructed.Then,a small-signal model of interconnected MGs via BTBCs containing primary control and secondary control is developed.This model facilitates the analysis of the impacts of BTBCs and various control strategies on the system stability.Subsequently,Copula functions and polynomial chaos expansion(PCE)are combined to achieve the probabilistic small-signal stability assessment.On this basis,the parameters of the cooperative control are optimized,enhancing the robustness of interconnected MGs via BTBCs.Finally,a case of interconnected MGs via BTBCs are built in MATLAB/Simulink to verify the accuracy and effectiveness of the proposed framework.
