基于MMC的直流电网换流站控制策略

李慧; 范新桥

doi:10.16513/j.2096-2185.DE.1901121

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分布式能源 ›› 2020, Vol. 5 ›› Issue (1) : 22-28. DOI: 10.16513/j.2096-2185.DE.1901121

学术研究

基于MMC的直流电网换流站控制策略

李慧 ,
范新桥

作者信息 +

Control Strategy for Converter Station in DC Grid Based on MMC

Hui LI ,
Xinqiao FAN

Author information +

文章历史 +

摘要

在基于模块化多电平换流器(modular multilevel converter, MMC)的柔性直流电网中，换流站的控制策略极其重要。针对现有控制方法的缺陷，提出了一种新的换流站控制策略，将改进型比例积分(proportional integral，PI)控制用于外环控制器，此外在有功功率外环控制器中还加入电压下垂控制。该策略可加快控制器的响应速度和调节速度，既能处理主站因故障退出、从站实现定电压控制切换的工况，又能满足当有功功率波动或直流电压波动时系统功率平衡及直流电压稳定的基本要求。利用PSCAD/EMTDC软件搭建了基于MMC的四端直流电网仿真模型，算例结果表明本文提出的控制策略是正确和有效的。

Abstract

The control strategy of the converter station is extremely important in the DC grid based on modular multilevel converter(MMC). Aiming at the shortcomings of current control methods, a new control strategy is proposed for the converter stations, improving controller respond speed and adjusting speed. In the novel control strategy, the improved proportional integral(PI) control is introduced into the outer loop controller, and the voltage droop control is combined for active power control, which can not only deal with the requirement of one slave station switching to the master station quickly when the master station loses due to faults, but also satisfy the requirements of active power balance and DC-side voltage stability during active power or DC voltage fluctuation. Based on the PSCAD/EMTDC software, a four-terminal MMC based DC grid model is built to simulate different conditions. The results show that the proposed control strategy is correct and effective.

导出引用

李慧, 范新桥. 基于MMC的直流电网换流站控制策略[J]. 分布式能源. 2020, 5(1): 22-28 https://doi.org/10.16513/j.2096-2185.DE.1901121

Hui LI, Xinqiao FAN. Control Strategy for Converter Station in DC Grid Based on MMC[J]. Distributed Energy Resources. 2020, 5(1): 22-28 https://doi.org/10.16513/j.2096-2185.DE.1901121

中图分类号： TM72

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