Research on Control Strategy for a 3-terminal LCC-MMC HVDC Transmission System

CHEN Lingyun; CHENG Gaihong; SHAO Chong; KANG Yi; PAN Xudong; ZHANG Zheren; XU Zheng

doi:10.13296/j.1001-1609.hva.2018.07.018

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Research on Control Strategy for a 3-terminal LCC-MMC HVDC Transmission System

更新时间：2025-04-26

- Research on Control Strategy for a 3-terminal LCC-MMC HVDC Transmission System
- High VoltageApparatus Vol. 54, Issue 7, Pages: 146-152(2018)
- 作者机构：
  
  1. 中国电力工程顾问集团中南电力设计院有限公司
  2. 浙江大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2018.07.018
  CLC： TM721.1
- Published：2018
- 稿件说明：
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[1]陈凌云,程改红,邵冲,康义,潘旭东,张哲任,徐政.LCC-MMC型三端混合直流输电系统控制策略研究[J].高压电器,2018,54(07):146-152.

CHEN Lingyun, CHENG Gaihong, SHAO Chong, et al. Research on Control Strategy for a 3-terminal LCC-MMC HVDC Transmission System[J]. High voltageapparatus, 2018, 54(7): 146-152.
[1]陈凌云,程改红,邵冲,康义,潘旭东,张哲任,徐政.LCC-MMC型三端混合直流输电系统控制策略研究[J].高压电器,2018,54(07):146-152. DOI： 10.13296/j.1001-1609.hva.2018.07.018.

CHEN Lingyun, CHENG Gaihong, SHAO Chong, et al. Research on Control Strategy for a 3-terminal LCC-MMC HVDC Transmission System[J]. High voltageapparatus, 2018, 54(7): 146-152. DOI： 10.13296/j.1001-1609.hva.2018.07.018.

摘要

整流侧采用电网换相型换流器（line commutated converter

LCC）

逆变侧采用模块化多电平换流器（modular multilevel converter

MMC）的混合型直流输电系统

结合LCC和MMC的优点

尤其适用于特高压直流输电应用场合。为了确保正常状态和故障状态下的稳定运行

文中针对混合型直流输电系统的控制策略进行研究。文中首先针对一个LCC整流站

两个MMC逆变站构成的三端混合直流系统

介绍了数学模型和整个直流系统的基本控制策略。然后针对基本控制策略下

逆变站中串联MMC存在的电压不均问题、整流侧交流系统故障时整流侧功率中断问题和逆变侧交流系统故障时的直流过电压问题

研究了用于改善系统响应特性的附加控制策略。最后在PSCAD/EMTDC中搭建了对应的三端混合直流系统。通过比较采用附加控制策略前后混合直流系统的响应特性

验证了附加控制策略的有效性。

Abstract

Hybrid HVDC system with line commutated converter（LCC）based rectifier and modular multilevel con-verter（MMC）based inverter combined the advantages of LCC and MMC

and is suitable for HVDC power transmis-sion application. To ensure the stable operation both in normal and fault condition

this paper studies the controlstrategy of the hybrid HVDC system. Based on one LCC rectifier and two MMC inverters hybrid HVDC system

thispaper firstly introduce the mathematical model and the basic control scheme. Then

to handle the voltage balancingof series-connected MMCs

the power interruption during AC fault at rectifier side and the DC overvoltage during ACfault at inverter side

this paper analyzed the additional control schemes. Finally

a digital simulation model of the 3-ter-minal LCC-MMC hybrid HVDC is realized in PSCAD/EMTDC. Based on the simulation results with and without theadditional control schemes

the validity of the additional control schemes is proved.

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