Control Method for Extending the Stable Operating Region of Cascaded H-bridge PV Inverter

YUAN Yisheng; Lü Sen

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Control Method for Extending the Stable Operating Region of Cascaded H-bridge PV Inverter

更新时间：2025-12-08

- Control Method for Extending the Stable Operating Region of Cascaded H-bridge PV Inverter
- Vol. 47, Issue 3, Pages: 972-982(2021)
- 作者机构：
  
  华东交通大学电气与自动化工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 March 2021，
  
  Published：2021
- 稿件说明：
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YUAN Yisheng, Lü Sen. Control Method for Extending the Stable Operating Region of Cascaded H-bridge PV Inverter[J]. 2021, 47(3): 972-982.
DOI：

YUAN Yisheng, Lü Sen. Control Method for Extending the Stable Operating Region of Cascaded H-bridge PV Inverter[J]. 2021, 47(3): 972-982. DOI：

摘要

针对级联型光伏逆变器在单元间功率不均衡情况下出现的并网电流畸变的问题

提出了一种基于无功补偿的级联型光伏逆变器优化控制策略。首先在dq坐标系下

经过深入研究得到了单位功率因数下的稳定运行约束条件;并以此为基础

得到了功率不平衡时所需补偿的无功电流值

各单元遵循有功按比例分配

无功按可承受能力分配的原则;然后

通过量化分析研究了无功补偿法对电压环的影响程度

优化了系统控制框图结构

进而消除了这一影响;最后

通过仿真与实验验证了所提控制策略的有效性和可行性。结果表明:在光伏功率严重不均衡时

所提方法仍能使逆变器稳定运行且系统电压环不再受无功补偿的影响。研究可为光伏逆变器的控制提供参考。

Abstract

In order to solve the problem of current distortion in the case of cascaded photovoltaic inverter with unbalanced power between units

an optimized control strategy for cascaded photovoltaic inverters based on reactive power compensation is proposed in this paper. The stable operating range of the inverter under the unit power factor is studied in the dq coordinate system. Thereby

the reactive current value to be compensated when the power is unbalanced is obtained. The active power of each unit is distributed proportionally

and the reactive power is distributed according to the affordability. Through quantitative analysis

the degree that the reactive power compensation method affects the voltage loop is obtained

and the system control block diagram is optimized so as to eliminate this influence. Simulations and experiments verify the effectiveness and feasibility of the proposed control strategy. The results show that when the photovoltaic power is severely unbalanced

the proposed method can still be used to ensure the inverter to run stably and the system voltage loop is no longer affected by reactive power compensation. The research can provide references for the control of the photovoltaic inverters.

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