| 引用本文: | 陈建新,张 旭,孟浩杰,等.基于下垂控制的单台换流器-无穷大系统数学模型及
直流系统稳定的解析条件[J].电力系统保护与控制,2022,50(1):60-68.[点击复制] |
| CHEN Jianxin,ZHANG Xu,MENG Haojie,et al.Mathematical model and analytical stabilizing condition of a droop-based single converter-infinite DC system[J].Power System Protection and Control,2022,50(1):60-68[点击复制] |
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| 摘要: |
| 基于功率-电压下垂控制的换流器因其较好的控制灵活性在多端直流输电系统中的应用日益广泛，同时也为直流电网稳定运行带来了新的挑战。利用单输入单输出分析法研究了单台并网换流器直流系统的稳定性问题。首先，建立系统扰动后的直流电压变化量和直流电流变化量间的传递函数。其次，利用Routh判据得到不同控制模式下系统的稳定判据。然后，定义了一个评价系统稳定性的关键指标—直流功率传输极限。最后，数值仿真结果验证了稳定性分析的准确性，以及所提稳定判据的正确性。 |
| 关键词: 基于功率-电压下垂控制换流器 直流侧稳定性 单输入单输出 Routh判据 直流功率传输极限 |
| DOI：DOI: 10.19783/j.cnki.pspc.210255 |
| 投稿时间：2021-03-10修订日期：2021-05-23 |
| 基金项目:国家自然科学基金项目资助(51807150)；杭州电力设备制造有限公司科技项目资助“交直流柔性互联配电网规划及协同控制技术研究与示范”(HD020112001039) |
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| Mathematical model and analytical stabilizing condition of a droop-based single converter-infinite DC system |
| CHEN Jianxin,ZHANG Xu,MENG Haojie,XU Yinfei,REN Xinzhuo,DENG Xiaodian,LI Yujun |
| (1. Hangzhou Electric Equipment Manufacturing Co., Ltd., Hangzhou 310018, China;
2. School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China)) |
| Abstract: |
| The droop-based converter plays an important role in a multi-terminal DC (MTDC) system because of its control flexibility. However, this imposes a great challenge on the stability of the DC grid. The main purpose of the paper is to examine the DC side stability of a single grid-connected VSC with the single input single output (SISO) method. The transfer function between the small perturbation of DC-link voltage and DC current at the end of transmission line is first constructed. Based on the SISO model, the stability criteria for a single VSC converter in different control modes is proposed by using the classical Routh judgement. A critical operation index, namely the DC power transfer limit, is defined to assess system stability. Finally, numerical simulation results validate the accuracy of the proposed stability analysis and the criteria for the droop-based converter.This work is supported by the National Natural Science Foundation of China (No. 51807150). |
| Key words: droop-based converter DC side stability single input single output (SISO) Routh judgement DC power transfer limit (DCPTL) |
