考虑限流的构网型变流器及角频率PID补偿器暂态稳定性分析OA
Transient Stability Analysis of Grid-forming Converter and Angular Frequency PID Compensator Considering Current Limiting
大扰动故障时有限过载能力的构网型变流器可能出现暂态失稳问题.首先,分析有功环暂态稳定性改造思路,推导了有功环参变量对暂态功角和频率稳定性的作用,得出了较为统一的角频率比例-积分-微分(PID)补偿器,该方法分别通过比例、积分和微分系数修正阻尼、功率指令和惯量,改善功角动态过程并构造功角平衡点以提高变流器暂态稳定性能;其次,考虑了限流幅值对变流器的影响,揭示了限流幅值恶化功角曲线的内在机制;随后,针对补偿器系数暂态稳定性分析比例和微分系数适用于功角平衡点存在的故障穿越,积分系数构造平衡点适用于永久故障穿越;同时,提出了考虑限流的补偿器参数设计流程,突出了限流削弱补偿器参数大小的潜在联系,并以吸引域大小和极限切除时间长短的暂态稳定性指标定性描述;最后,通过仿真和实验对比几种方案,验证了角频率PID补偿器提高构网型变流器暂态稳定性能的有效性.
Transient instability may occur in grid-forming converters with limited overload capacity under large-disturbance faults.Firstly,the concept of transient stability enhancement in active power control loops is analyzed,and the influence of active power control loop parameters on transient power-angle and frequency stability is investigated.A relatively unified angular frequency proportional-integral-differential(PID)compensator is proposed.This method improves the power-angle dynamic process and constructs a power-angle equilibrium point by adjusting damping,power command,and inertia through proportional,integral,and derivative coefficients,thereby enhancing the transient stability performance of the converter.Secondly,considering the impact of current limiting amplitude on the converter,the inherent mechanism of deteriorating power-angle curve due to current limiting amplitude is revealed.Subsequently,for the transient stability analysis of compensator coefficients,the proportional and differential coefficients are applicable for fault ride-through when the power-angle balance point exists,while the integral coefficients are used to construct balance points for permanent fault ride-through.At the same time,a compensator parameter design process considering current limiting is proposed,highlighting the potential connection between current limiting and compensator parameters,and qualitatively describing it with transient stability indicators such as the size of the attraction domain and the length of the clearing time.Finally,the effectiveness of the angular frequency PID compensator in improving the transient stability performance of grid-forming converters is verified through simulation and experimental comparison of several schemes.
颜湘武;胡演;蔡光;贾焦心;邵尹池
河北省分布式储能与微网重点实验室(华北电力大学),河北省 保定市 071003河北省分布式储能与微网重点实验室(华北电力大学),河北省 保定市 071003河北省分布式储能与微网重点实验室(华北电力大学),河北省 保定市 071003河北省分布式储能与微网重点实验室(华北电力大学),河北省 保定市 071003国网冀北电力有限公司电力科学研究院,北京市 100054
构网型变流器有功环限流幅值暂态稳定性比例-积分-微分补偿器功角曲线故障穿越
grid-forming converteractive power control loopcurrent limiting amplitudetransient stabilityproportional-integral-differential(PID)compensatorpower-angle curvefault ride-through
《电力系统自动化》 2026 (6)
87-99,13
国家自然科学基金青年基金资助项目(52207102)智能电网国家科技重大专项资助项目(2025ZD0805201). This work is supported by National Natural Science Foundation of China(No.52207102)and Smart Grid-National Major Science and Technology Project of China(No.2025ZD0805201).
评论