| 引用本文: | 姜汉周,潘 欢,纳春宁.混合负载下基于虚拟振荡器控制的离网逆变器控制策略研究[J].电力系统保护与控制,2023,51(9):88-96.[点击复制] |
| JIANG Hanzhou,PAN Huan,NA Chunning.Island inverter control strategy based on improved virtual oscillator control under mixed load[J].Power System Protection and Control,2023,51(9):88-96[点击复制] |
|
| 摘要: |
| 虚拟振荡器控制(virtual oscillator control, VOC)策略是一种新型分布式控制方法，在离网和并网逆变器中具有巨大的应用潜力。然而，当负载变化及非线性不平衡负载接入系统时，基于VOC的离网逆变器系统会存在频率偏差和谐波问题。针对上述不足，通过分析混合负载对电力系统造成的影响，提出一种改进的VOC策略，并引入电压、电流正负序分离技术，设计了二次频率补偿器。同时改进了电压电流双闭环控制结构，进一步提高了系统抑制谐波的能力。在Matlab/Simulink平台中搭建了离网逆变器系统仿真模型。通过与传统VOC进行对比，验证了所提控制策略在解决频率偏差和抑制谐波问题中的有效性。 |
| 关键词: 离网逆变器 虚拟振荡器控制 混合负载 二次频率补偿 正负序分离 |
| DOI：10.19783/j.cnki.pspc.221012 |
| 投稿时间：2022-07-01修订日期：2022-08-26 |
| 基金项目:国家自然科学基金项目资助(61763040)；宁夏自然科学基金项目资助(2022AAC05001)；中科院“西部之光”人才培养计划项目资助 |
|
| Island inverter control strategy based on improved virtual oscillator control under mixed load |
| JIANG Hanzhou1,PAN Huan1，2,NA Chunning1，2 |
| (1. School of Physics and Electronic-Electrical Engineering, Ningxia University, Yinchuan 750021, China;
2. Ningxia Key Laboratory of Electrical Energy Security, Yinchuan 750004, China) |
| Abstract: |
| The virtual oscillator control (VOC) strategy is a new distributed control method with great application potential in off-grid and grid-connected inverters. However, when load variations and nonlinear unbalanced loads are connected to the system, the off-grid inverter system based on VOC will exhibit problems such as frequency deviation and harmonics. Considering the above-mentioned deficiencies, by analyzing the impact of mixed load on the power system, this paper proposes an improved VOC strategy. The technology of positive and negative sequence separation of voltage and current is introduced and a secondary frequency compensator is designed. Also, the voltage-current double closed-loop structure is improved to further augment the system's ability to suppress harmonics. A simulation model of the inverter off-grid system is built on the Matlab/Simulink platform. Compared with conventional VOC, the effectiveness of the proposed control strategy in solving the problem of frequency deviation and harmonic suppression is verified. |
| Key words: off-grid inverter virtual oscillators control mixed loads secondary frequency compensation separation of positive and negative sequence |
