Fault Analysis of Inverter-Interfaced Distributed Generators With Different Control Schemes
Fault Analysis of Inverter-Interfaced Distributed Generators With Different Control Schemes
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DOI：
10.1109/tpwrd.2017.2717388
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发表时间：
2018-06
影响因子：
4.4
通讯作者：
Zhikang Shuai;Chao Shen;Xin Yin;Xuan Liu;Z. Shen
中科院分区：
文献类型：
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作者：
Zhikang Shuai;Chao Shen;Xin Yin;Xuan Liu;Z. Shen
逆变器接口分布式电源(IIDG)控制方式的多样化给微电网故障电流估计带来了困难，使原有的保护系统失效，威胁到电力电子设备的安全。因此，研究IIDG的故障特征具有重要意义。研究了IIDG对称故障和不对称故障引起的故障电流特性。研究了电流控制(恒流控制和PQ控制)和电压控制(V/F控制和下垂控制)两种广泛使用的控制方式，以提供对故障电流的直观比较。提出了一种计算下垂控制IIDG故障电流的新算法。发现不同的限制器对IIDG的故障响应有很大的影响，本文对其影响进行了详细的研究。基于PSCAD/EMTDC的仿真结果和基于MATLAB/SIMULINK的计算结果验证了所提出故障模型的正确性。
Diversification of control schemes adopted by inverter-interfaced distributed generators (IIDGs) leads to difficulties in fault current estimation in a microgrid, which might make preexisting protection systems invalid and threaten the safety of power electronic devices. It is therefore important to study fault characteristics of IIDGs. This paper investigates characteristics of fault current of IIDGs caused by both symmetrical and asymmetrical faults. Two kinds of widely used control modes, current control (constant current control and PQ control) and voltage control (V/F control and droop control), are under investigation to provide an intuitive comparison on fault current. In particular, a novel algorithm is proposed to calculate fault current of droop-controlled IIDGs. It is found that different limiters have great impacts on fault response of IIDGs and detailed research works are carried out to identify the effects in this paper. Simulation results based on PSCAD/EMTDC and calculation results based on MATLAB/Simulink verify the correctness of the proposed fault models.