复合型功率同步逆变器:序阻抗建模与并网特性  

Compound Power Synchronized Inverters:Sequence Impedance Modelling and Grid Integration Characteristics

作　　者：陈哲[1] 朱淼[1] 侯川川 蔡旭[1] CHEN Zhe;ZHU Miao;HOU Chuanchuan;CAI Xu(Key Lab of Control of Power Transmission and Conversion,Ministry of Education(Shanghai Jiao Tong University),Minhang District,Shanghai 200240,China)

机构地区：[1]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市闵行区200240

出　　处：《中国电机工程学报》2023年第5期1927-1939,共13页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51877137)。

摘　　要：分布式能源通常借助逆变器接入电网,但基于锁相环的传统电流控制策略在弱电网并网场景下易引发失稳现象。因此,文中提出“复合型功率同步逆变器”概念,通过有功功率与无功功率相结合的复合功率同步方法替代传统锁相环,以改善逆变器在弱电网条件下的并网暂态响应,并有效提升并网稳定性。基于谐波线性化方法,推导建立复合型功率同步逆变器的序阻抗模型,并针对同步系数及稳态工作点对并网逆变器稳定性影响机理展开理论分析。阻抗分析结果表明,所提出的复合型功率同步逆变器的输出阻抗基频段幅值在宽工作范围内主要受同步系数影响。同时,搭建实验样机,硬件实验结果证明了所提复合功率同步方法的有效性与阻抗分析的正确性。Distributed generations are usually connected to the power grid through inverters,but the traditional current control strategy based on phase-locked loop(PLL)is likely to cause instability under weak grid connection.Therefore,this paper proposes the concept of“compound power synchronized(CPS)inverter”,which replaced the traditional PLL with a CPS method.The proposed CPS inverter combined active and reactive power to improve the transient response under weak grid scenario and effectively improved the stability of grid connection.Based on the harmonic linearization method,this paper derives and establishes the sequence impedance model of the CPS inverter,and conducts a theoretical analysis of the mechanism of the synchronization coefficient and steady-state operation point on the stability of the grid-connected inverter system.The impedance analysis results show that the fundamental frequency amplitude of the output impedance of the CPS inverter proposed in this paper is mainly affected by the synchronization coefficient in a wide operation range.An experimental prototype is built at the same time,and the hardware experiment results proves the effectiveness of the CPS method proposed in this paper and the correctness of impedance analysis.

关 键 词：功率同步控制 序阻抗建模 电流源型控制 并网逆变器 

分 类 号：TM46[电气工程—电器]