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双级式光伏发电虚拟惯量控制策略
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1. 国网宁夏电力有限公司电力科学研究院, 宁夏回族自治区银川市 750001; 2. 东北电力大学电气工程学院, 吉林省吉林市 132012; 3. 国网宁夏电力有限公司, 宁夏回族自治区银川市 750001; 4. 宁夏电力能源安全重点实验室(国网宁夏电力有限公司电力科学研究院), 宁夏回族自治区银川市 750002

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基金项目:

国家重点研发计划资助项目(2017YFB0902000);国家电网有限公司科技项目(5229DK17000W)


Virtual Inertia Control Strategies for Double-stage Photovoltaic Power Generation
Author:
Affiliation:

1. Electric Power Research Institute of State Grid Ningxia Electric Power Company, Yinchuan 750001, China; 2. School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China; 3. State Grid Ningxia Electric Power Co. Ltd., Yinchuan 750001, China; 4. Ningxia Key Laboratory of Electrical Energy Security(Electric Power Research Institute of State Grid Ningxia Electric Power Company), Yinchuan 750002, China

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    摘要:

    大规模光伏发电并网挤占了具有转动惯量的同步发电机组空间,导致惯量减小与调频能力不足的问题,迫切需要光伏发电主动参与电网频率调节。以双级式光伏发电为研究对象,在研究基于锁相环动态的常规虚拟惯量控制的同时,提出基于低压直流电容动态的虚拟惯量控制和基于高压直流电容动态的虚拟惯量控制,并分析控制参数对虚拟惯量控制的影响。研究结果表明:(1)对于常规虚拟惯量控制,锁相环控制带宽越小,频率跌落过程中光伏发电可提供支撑的功率越多;(2)对于低压直流电容动态的虚拟惯量控制,由于电压环中引入电网频率-低压侧直流电压(f-UPV)补偿环节,低压直流电压的改变不仅影响频率的暂态过程,还影响频率的稳态偏差;(3)对于高压直流电容动态的虚拟惯量控制,减小Boost变换器的电压环积分系数,减缓直流电压的动态过程,频率跌落过程中光伏发电可提供支撑的功率越多。

    Abstract:

    Large-scale grid-connected photovoltaic(PV)generation has an important effect on synchronous generators with rotational inertia, which causes the problem of insufficient inertia and insufficient frequency modulation capability. Therefore, there is an urgent need for PV generation to take part in frequency regulation. Taking the two-stage PV power generation as the research object, the conventional virtual inertia control based on the dynamics of the phase locked loop(PLL)is studied. At the same time, the virtual inertia control based on the dynamics of the low-voltage DC capacitor and the virtual inertia control based on the dynamics of the high-voltage DC capacitor are proposed, and the influence of control parameters of virtual inertia control is analyzed. The results show that: (1) in the case of conventional virtual inertia control, the narrower PLL control bandwidth is, the more PV power can be provided during the process of frequency sag; (2) in the case of virtual inertia control based on low-voltage DC capacitor dynamics, owing to the introduction of f-UPV compensation in the voltage control loop, the change of low DC voltage affects not only the frequency dynamic process but also the steady-state frequency deviation; (3) in the case of virtual inertia control based on high-voltage DC capacitor dynamics, PV generation can provide more power in the case of frequency sag, when the integral coefficient of the Boost converter voltage control loop rises to slow down the dynamic response of the DC voltage.

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杨慧彪,贾祺,项丽,等.双级式光伏发电虚拟惯量控制策略[J].电力系统自动化,2019,43(10):87-94. DOI:10.7500/AEPS20180812001.
YANG Huibiao, JIA Qi, XIANG Li,et al.Virtual Inertia Control Strategies for Double-stage Photovoltaic Power Generation[J].Automation of Electric Power Systems,2019,43(10):87-94. DOI:10.7500/AEPS20180812001.

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  • 收稿日期:2018-08-12
  • 最后修改日期:2019-03-18
  • 录用日期:2019-01-17
  • 在线发布日期: 2019-04-03
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