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徐香菊,朱淼,侯川川,蔡旭.计及闭环策略的并网逆变器集群阻抗特性比较分析[J].电源学报,2019,17(5):96-105
计及闭环策略的并网逆变器集群阻抗特性比较分析
Comparative Analysis of Impedance Characteristics of Grid-connected Inverter Cluster with Consideration of Closed-loop Control Strategy
投稿时间:2018-11-21  修订日期:2019-04-19
DOI:10.13234/j.issn.2095-2805.2019.5.96
中文关键词:  阻抗模型  并网逆变器集群  稳定性  次/超同步振荡  闭环控制
英文关键词:impedance modeling  grid-connected inverter cluster  stability  sub/super synchronous oscillation  closed-loop control
基金项目:国家电网科技资助项目(SGTYHT/16-JS-198)
作者单位E-mail
徐香菊 上海交通大学电子信息与电气工程学院, 上海 200240  
朱淼 上海交通大学电子信息与电气工程学院, 上海 200240 miaozhu@sjtu.edu.cn 
侯川川 上海交通大学电子信息与电气工程学院, 上海 200240  
蔡旭 上海交通大学电子信息与电气工程学院, 上海 200240  
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中文摘要:
      以逆变器集群为接口的新能源大规模接入改变了电网的动态特性,次/超同步振荡现象频发,制约了新能源的并网消纳。为深入研究该类型振荡的抑制方法,以单台并网逆变器输出阻抗为最小建模单元,引入谐波线性法推导了PI控制和准PR控制策略下逆变器闭环系统的序阻抗模型,在此基础上建立考虑多台逆变器并联运行的等效阻抗模型。通过对比两种闭环控制策略下逆变器集群输出阻抗的低频段动态特性和接入弱电网后的系统稳定性,在电流内环具有相同稳定裕度的情况下,相较于PI控制,逆变器集群采用准PR控制时互联系统稳定裕度更大,可以降低系统发生次/超同步振荡风险。最后在Matlab/Simulink仿真平台搭建逆变器集群并网仿真模型,模拟了不同强弱电网环境下的并网稳定与失稳现象,从而验证理论分析结果。
英文摘要:
      The connection of large-scale new energy to power grid, which uses an inverter cluster as interface, has changed the dynamic characteristics of power grid. In addition, the sub/super synchronous oscillations occur frequently, thus restricting the absorption of new energy. To further study the suppression method for this kind of oscillations, the impedance output from a single grid-connected inverter is taken as the smallest modelling unit, and a sequence impedance model of inverter closed-loop system under PI and quasi-PR control strategies is formulated through the introduction of the harmonic linear method. On this basis, the equivalent impedance model with the consideration of multiple inverters in parallel operation is proposed. By comparing the low-frequency dynamic characteristics of impedance output from the inverter cluster under two closed-loop control strategies and the system stability after the connection to the weak gird, it is found that under the same stability margin of inner current loop, the stability margin of the grid-connected system based on quasi-PR control is larger than that based on PI control, thus reducing the risk of sub/super synchronous oscillations. Finally, the simulation models of grid-connected inverter cluster are built in the Matlab/Simulink simulation platform, and the stability and instability phenomena of grid-connected system in different strong/weak grid environments are simulated, which verifies the results of theoretical analysis.
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