并网变换器的暂态同步稳定性分析:稳定域估计与镇定控制  

Transient Grid-synchronization Stability Analysis of Grid-tied Voltage Source Converters:Stability Region Estimation and Stabilization Control

作　　者：张宇[1] 张琛[1] 蔡旭[1] 邱伟 赵晓斌 ZHANG Yu;ZHANG Chen;CAI Xul;QIU Wei;ZHAO Xiaobin(Key Laboratory of Control of Power Transmission and Conversion,Ministry of Education(Shanghai Jiao Tong University),Minhang District,Shanghai 200240,China;State Key Laboratory of HVDC,Electric Power Research Institute(China Southern Power Grid),Guangzhou 510080,Guangdong Province,China)

机构地区：[1]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市闵行区200240 [2]直流输电技术国家重点实验室(南方电网科学研究院有限责任公司),广东省广州市510080

出　　处：《中国电机工程学报》2022年第21期7871-7883,共13页Proceedings of the CSEE

基　　金：国家自然科学基金(重点项目)(51837007);南网电科院直流输电技术国家重点实验室开放基金项目(SKLHVDC-2019-KF-02)。

摘　　要：针对并网变换器在大扰动下暂态同步稳定性问题,当前的研究缺少基于直接法的严谨分析(如稳定域估计)。为此,该文构造解析的李雅普诺夫函数,通过研究耗散区间和最大临界等位面得到稳定域的定量估计方法。据此,进一步给出暂态同步稳定性的定量判据及稳定裕度指标,定量分析实际变量对暂态同步稳定性的影响。在此基础上提出两种稳定控制方法:一种通过补偿锁相环的负阻尼效应扩大稳定域范围;另一种通过重塑状态轨迹将锁相环的状态引导至稳定域内,以实现失稳镇定。所提稳定域估计方法相较当前其他解析方法(如等面积法)更为严格;所提镇定控制方法的有效性均在PSCAD/EMTDC仿真和RT-LAB硬件在环平台进行了全面验证。Regarding the transient grid-synchronization stability(GSS) of the phase-locked loop(PLL)-synchronized voltage source converters(VSCs), a rigorous practice of Lyapunov’s direct method(e.g., stability region estimation) is still in need. In this regard, a dedicated Lyapunov function(LF)was proposed, and its dissipative-region-based critical level set was derived. A stability criterion was developed, as well as an analytical stability index, to evaluate the GSS of the VSC.Quantitative analysis of the parametric influence on GSS was conducted accordingly, and two control methods were raised to improve the GSS, i.e., the phase-locked loop stabilizer(PLLS)and the PLL-integrator-limiter-based stabilization method. The PLLS could compensate the negative damping effect of PLL,while the integrator limiter could guide the unstable states back into the stability region. The proposed method for GSS evaluation exhibits better performance than the previous methods(e.g., the equal area criterion(EAC)). Furthermore,the proposed stability control methods can be verified via both PSCAD/EMTDC simulation and RT-LAB controller hardwarein-loop(CHIL) platform.

关 键 词：新能源 电压源变换器 锁相环 大扰动 暂态稳定性 稳定域估计 稳定控制 

分 类 号：TM712[电气工程—电力系统及自动化]