基于多端直流网络潮流分布的变斜率下垂控制策略

doi:10.3969/j.issn.1000－7229.2017.03.003

摘要/Abstract

摘要： 柔性直流输电(flexible AC transmission system,FACTS)是大规模可再生能源并网的有效技术手段。下垂控制作为多端直流输电系统（multi-terminal high voltage direct current transmission, MTDC）主要的站间协调控制方式，存在直流功率利用率低、直流电压质量较差、易造成系统过电压等缺点。为有效改进下垂控制的控制性能，首先推导直流网络通用潮流计算算法，该算法适用于换流站任意控制方式组合的直流网络。基于潮流计算结果，提出变斜率下垂控制策略。该策略制定了3种控制模式，根据不同需求，通过相关计算，重新分配下垂系数。最后，在PSCAD/EMTDC中搭建4端直流网络进行时域仿真验证。结果表明，所提出的变斜率下垂控制策略能有效减小稳态误差，并有效预防过电压。

关键词: , 多端柔性直流输电（VSC-MTDC）, 模块化多电平变流器(MMC), 潮流计算, 下垂控制

Abstract: Flexible direct current transmission system (FACTS) is an effective technique for large scale renewable energy integration. As the main coordinated control between stations in multi-terminal high voltage direct current transmission (MTDC) system, droop control has some disadvantages such as low utilization rate of DC power, poor quality of DC voltage and causing over-voltage easily. To improve the control performance of droop control, firstly, this paper derives the general power flow calculation method for DC grid, which is applicable for any control combination of DC grid in convertor station. Then, this paper proposes an improved droop control strategy based on power flow calculation. According to different needs, the strategy consists of 3 control modes recalculating droop coefficient. Finally, a 4-terminal DC network is developed in PSCAD/EMTDC and time-domain simulation is performed. The results show that the proposed variable-slope droop control strategy can effectively reduce the steady-state error and prevent overvoltage.

Key words: VSC-MTDC, modular multilevel converter (MMC), power flow, droop control

中图分类号:

TM 72

苗丹, 刘天琪, 王顺亮. 基于多端直流网络潮流分布的变斜率下垂控制策略[J]. 电力建设, 2017, 38(3): 19-.

MIAO Dan, LIU Tianqi, WANG Shunliang. Variable-Slope Droop Control Strategy Based on Power Flow Distribution of Multiterminal DC Grid[J]. Electric Power Construction, 2017, 38(3): 19-.

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