| 引用本文: | 王仕韬,郭方正,李立,宋新新,刘矞,宋蕙慧,李经纬.孤岛下基于虚拟振荡器控制的构网型并联逆变器电压控制策略[J].电力自动化设备,2025,45(1):131-138,183 |
| WANG Shitao,GUO Fangzheng,LI Li,SONG Xinxin,LIU Yu,SONG Huihui,LI Jingwei.Voltage control strategy of grid forming parallel inverters based on virtual oscillator control under islanded mode[J].Electric Power Automation Equipment,2025,45(1):131-138,183 |
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| 摘要: |
| 现有基于虚拟振荡器控制的构网型并联逆变器由于控制参数耦合，存在母线电压谐波含量高、受负载影响波动大的问题，降低了孤岛模式下的供电质量。因此，针对电压建立阶段和电压维持阶段的不同需求，通过优化虚拟振荡器参数提出了谐波抑制方法。基于逆变器输出特性，提出了调压方法。结合参数滚动优化方法将谐波抑制和调压关联，形成电压控制策略。此外，建立了基于虚拟振荡器控制的并联逆变器系统带阻感性负载的小信号状态空间模型。结果表明，在所提电压控制策略下，并联系统的母线电压总谐波畸变率能降低至1.13 %，负载切换时母线电压能快速恢复稳定，在轻载、额定和重载3种工况下，系统状态矩阵的主导特征值均位于左半复平面内，系统是渐近稳定的。 |
| 关键词: 并联逆变器 构网型控制 虚拟振荡器控制 调压 稳定性分析 |
| DOI：10.16081/j.epae.202409020 |
| 分类号:TM464 |
| 基金项目:国家自然科学基金资助项目(52477085)；国家电网有限公司技术学院分公司科技项目(SGTC0000JWIS2310087, SGTC0000JWJS2310134) |
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| Voltage control strategy of grid forming parallel inverters based on virtual oscillator control under islanded mode |
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WANG Shitao1, GUO Fangzheng1, LI Li2, SONG Xinxin1, LIU Yu3, SONG Huihui4, LI Jingwei1
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1.Technology College Branch of State Grid Corporation of China, Jinan 250002, China;2.School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China;3.Ultra-high Voltage Company of State Grid Shandong Electric Power Company, Jinan 250002, China;4.School of New Energy, Harbin Institute of Technology(Weihai),Weihai 264200, China
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| Abstract: |
| Because of the coupling of control parameters, the existing grid forming parallel inverters based on virtual oscillator control have the problems of high harmonic content of bus voltage and significant vol-tage fluctuation impacted by load, which reduces the power supply quality under islanded mode. Therefore, according to the different requirements of voltage establishment stage and voltage maintenance stage, the harmonic suppression method is proposed by optimizing the parameters of virtual oscillator. Based on the output characteristics of inverter, a voltage regulation method is proposed. A voltage control strategy is formed by associating harmonic suppression and voltage regulation through a parametric rolling optimization method. In addition, a small signal state space model of virtual oscillator control-based parallel inverter system with resistive-inductive loads is established. The results show that, under the proposed voltage control strategy, the bus voltage total harmonic distortion of the parallel system can be reduced to 1.13 %,and the bus voltage can be quickly restored to stability when the load is switched. The dominant eigenvalues of the system state matrix are all located in the left half complex plane under three working conditions of light load, rated load and heavy load, indicating the asymptotically stability of system. |
| Key words: parallel inverters grid forming control virtual oscillator control voltage regulation stability analysis |
