含光伏并网的弱交流系统低频振荡协调控制策略
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毕悦(1993-),女,硕士,助理工程师,主要从事新能源并网检测与运行控制研究;E-mail:ellenb@163.com

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TM721

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国家电网公司科技项目(SGNXJY00GHJS1900039)


Coordinated control strategy for low frequency oscillations of weak AC grid connected PV systems
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    摘要:

    基于中国太阳能的实际分布情况,大规模光伏电站往往接入短路容量较低且背景谐波含量较高的弱交流送端系统。光伏的大规模并网对末端电网阻尼特性产生显著影响的同时也为低频振荡的抑制提供了新途径。在此背景下,基于四机两区域系统建立送端电网接入大容量光伏的电磁暂态仿真模型,并利用 TLS-ESPRIT 算法辨识系统低频振荡特性。此外,分别针对光伏逆变器与 SVG 控制环节,提出利用带观测器的线性二次型最优控制方法在其各自控制回路设计附加阻尼控制器,实现对局部和全局低频振荡的协调控制。仿真结果表明,所提控制策略具有明显抑制效果,且能在一定程度内增大送端系统功率传输能力。

    Abstract:

    According to the actual distribution of solar energy in China, largescale photovoltaic power plants frequently connect to weak delivery AC systems, which have a low shortcircuit capacity but a high background harmonic content. The large capacity of photovoltaics connecting to the grid has already made a significant impact on the end grid’s damping characteristics, meanwhile providing a new method to suppress low frequency oscillation. Under the background, on the basis of the fourmachine twoarea system, an electromagnetic transient simulation model including largecapacity photovoltaic plantsis set up. And the low frequency oscillation characteristics of the system areanalyzed by the total least squaresestimation of signal parameters via the rotational invariance technique(TLSESPRIT). Aiming at coordinatelysuppressing low frequency oscillation in intraarea and interarea, the additional damping controller designed by linear quadratic regulator(LQR) control method with an observer isrespectively set in the different control loop of photovoltaic inverter and SVG. Simulation results show that the proposed method can effectively suppress the low frequency oscillation and increase the system's capability ofsending power in a certain extent.

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毕悦,方思瑞,于舒祺.含光伏并网的弱交流系统低频振荡协调控制策略[J].电力科学与技术学报,2021,(4):59-65. Bi Yue, Fang Sirui, Yu Shuqi. Coordinated control strategy for low frequency oscillations of weak AC grid connected PV systems[J]. JOURNAL OF EIECTRIC POWER SCIENCE AND TECHNOLOGY,2021,(4):59-65.

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  • 在线发布日期: 2021-08-28
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