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
输电网络具有结构复杂、节点密集的特点,需要有效的手段对其进行动态调控。为了提升电网系统运行效率,研究提出一种基于异步优势动作评价算法的变电站主接线网络动态调控模型(Dynamic control model of substation main connection netw...输电网络具有结构复杂、节点密集的特点,需要有效的手段对其进行动态调控。为了提升电网系统运行效率,研究提出一种基于异步优势动作评价算法的变电站主接线网络动态调控模型(Dynamic control model of substation main connection network based on A3C algorithm,SMWA)。该模型通过强化学习的方式对电网结构进行模拟输出,再基于用电需求和故障状态,利用异步优势动作评价对网络进行动态调控。测试结果显示,在128节点和256节点环境下,所构建模型取得的奖励值分别为91和85。在实际的应用中,模型可将实际的变电站主接线网络负载率降低至65.9%。以上结果说明,所构建模型具有优越的工作性能,能够较好地完成实际的电网动态调控任务,有效提升变电站主接线网络的运行效率。展开更多
This paper constructs a synthetic framework for the operational reliability evaluation and risk mitigation of asynchronous grids coupled through flexible high-voltage DC(HVDC)systems(AGs-FDCSs).First of all,an analyti...This paper constructs a synthetic framework for the operational reliability evaluation and risk mitigation of asynchronous grids coupled through flexible high-voltage DC(HVDC)systems(AGs-FDCSs).First of all,an analytical model for the unavailability of DC units is reformulated to refine and facilitate the reliability modeling of such flexible HVDC systems considering their time-dependent features as well as the impacts of converter station configurations.Subsequently,the operational risk associated with the redispatch procedure is extended to the reliability evaluation of composite power system,and the risk is mitigated through an optimal power flow(OPF)based short-term state assessment model.In addition,some new reliability indices like expected DC transmission power(EDCTP)and DC terminal outage probability(DCTOP)are defined to quantify the impact of the reliability of flexible HVDC systems on the entire grid.The effectiveness of the proposed framework on a modified IEEE RTS-79 system is validated with the elaborate discussions on the time-dependent reliability of AGs-FDCSs as well as the impacts of the converter station configurations.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
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.
文摘输电网络具有结构复杂、节点密集的特点,需要有效的手段对其进行动态调控。为了提升电网系统运行效率,研究提出一种基于异步优势动作评价算法的变电站主接线网络动态调控模型(Dynamic control model of substation main connection network based on A3C algorithm,SMWA)。该模型通过强化学习的方式对电网结构进行模拟输出,再基于用电需求和故障状态,利用异步优势动作评价对网络进行动态调控。测试结果显示,在128节点和256节点环境下,所构建模型取得的奖励值分别为91和85。在实际的应用中,模型可将实际的变电站主接线网络负载率降低至65.9%。以上结果说明,所构建模型具有优越的工作性能,能够较好地完成实际的电网动态调控任务,有效提升变电站主接线网络的运行效率。
基金supported by the National Natural Science Foundation of China(No.52177071)。
文摘This paper constructs a synthetic framework for the operational reliability evaluation and risk mitigation of asynchronous grids coupled through flexible high-voltage DC(HVDC)systems(AGs-FDCSs).First of all,an analytical model for the unavailability of DC units is reformulated to refine and facilitate the reliability modeling of such flexible HVDC systems considering their time-dependent features as well as the impacts of converter station configurations.Subsequently,the operational risk associated with the redispatch procedure is extended to the reliability evaluation of composite power system,and the risk is mitigated through an optimal power flow(OPF)based short-term state assessment model.In addition,some new reliability indices like expected DC transmission power(EDCTP)and DC terminal outage probability(DCTOP)are defined to quantify the impact of the reliability of flexible HVDC systems on the entire grid.The effectiveness of the proposed framework on a modified IEEE RTS-79 system is validated with the elaborate discussions on the time-dependent reliability of AGs-FDCSs as well as the impacts of the converter station configurations.
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.
