| 引用本文: | 葛乐,顾佳易,王存平,史明明,黄仁乐.基于改进无差拍光伏并网谐振抑制研究[J].电力系统保护与控制,2018,46(19):66-73.[点击复制] |
| GE Le,GU Jiayi,WANG Cunping,SHI Mingming,HUANG Renle.Research on resonance suppression based on improved deadbeat grid-connected photovoltaic[J].Power System Protection and Control,2018,46(19):66-73[点击复制] |
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| 摘要: |
| 分布式光伏接入配电网会产生谐波，易引发系统谐振，危害配电网可靠运行。为解决这一问题，建立并网逆变器等效模型，分析其产生谐振机理。在此基础上，为提高谐振抑制效果，提出一种改进无差拍控制策略，通过预测k+2时刻采样电流，解决了传统无差拍控制延时以及电流闭环控制响应性差等问题。然后将其与虚拟谐波阻抗法结合，重塑逆变器自身输出阻抗，破坏谐振形成条件。通过系统实验验证，表明了所提方法对抑制谐振的有效性。 |
| 关键词: 分布式光伏 等效模型 谐振机理 无差拍控制 虚拟谐波阻抗法 |
| DOI：10.7667/PSPC171362 |
| 投稿时间：2017-09-13修订日期：2017-11-10 |
| 基金项目:国家自然科学基金项目资助(51707089);国家电网公司总部科技项目资助(52020116000D);国网江苏省电力公司科技项目资助(J2017038) |
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| Research on resonance suppression based on improved deadbeat grid-connected photovoltaic |
| GE Le,GU Jiayi,WANG Cunping,SHI Mingming,HUANG Renle |
| (School of Electrical Engineering, Nanjing Institute of Technology, Nanjing 211167, China;State Grid Beijing Electric Power Company, Beijing 100031, China;Jiangsu Electric Power Company Research Institute, Nanjing 211103, China) |
| Abstract: |
| Large harmonics can be generated when distributed PV is connected to distribution network, initiating system resonance and damaging distribution network operation. To solve this problem, this paper establishes grid inverter equivalent model and analyzes the causes of resonance. On this basis, an improved deadbeat control strategy is proposed to improve the harmonic suppression effect. By predicting k+2 sampling current, it overcomes the shortcomings of the traditional deadbeat control delay and the poor response of the current closed-loop control. Then, it combines with the virtual harmonic impedance method, increases the output current bandwidth, reshapes the output impedance of the inverter, and destroys the resonant forming condition. Through system experiment verification, the results show that the method is effective to inhabit resonance. This work is supported by National Natural Science Foundation of China (No. 51707089), Science and Technology Project of Headquarter of State Grid Corporation of China (No. 52020116000D) and Science and Technology Project of State Grid Jiangsu Electric Power Company (No. J2017038). |
| Key words: distributed PV equivalent model harmonic mechanism deadbeat control virtual harmonic impedance method |
