双级式光伏发电虚拟惯量控制策略

YANG Huibiao

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双级式光伏发电虚拟惯量控制策略

更新时间：2025-08-13

- 双级式光伏发电虚拟惯量控制策略
- Automation of Electric Power Systems Vol. 43, Issue 10, Pages: 87-94(2019)
- 作者机构：
  
  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
- 作者简介：
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- Published：2019
- 稿件说明：
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YANG Huibiao. [J]. Automation of electric power systems, 2019, 43(10): 87-94.
DOI：

YANG Huibiao. [J]. Automation of electric power systems, 2019, 43(10): 87-94. DOI：

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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