一种适用于直流配电网中半桥-全桥混合型MMC的全电平逼近调制策略

doi:10.12204/j.issn.1000-7229.2022.06.008

电力建设 ›› 2022, Vol. 43 ›› Issue (6): 75-83.doi: 10.12204/j.issn.1000-7229.2022.06.008

• 直流电网关键装备·栏目主持宋强副教授、余占清副教授、赵彪副教授 • 上一篇下一篇

一种适用于直流配电网中半桥-全桥混合型MMC的全电平逼近调制策略

张桂红¹(), 王琛²(), 张祥成¹, 王世斌¹, 白左霞³, 张中锋⁴

1.国网青海省电力公司经济技术研究院,西宁市 810008
2.新能源电力系统国家重点实验室(华北电力大学),河北省保定市 071003
3.国网青海省电力公司,西宁市 810001
4.南京南瑞继保电气有限公司,南京市 211100

收稿日期:2021-11-11 出版日期:2022-06-01 发布日期:2022-05-31
通讯作者: 王琛 E-mail:wangchen1992ncepu@163.com
作者简介:张桂红(1982),女,硕士,高级工程师,主要研究方向为电网规划设计及新能源并网发电技术
张祥成(1983),男,学士,高级工程师,主要研究方向为能源电力规划
王世斌(1995),男,学士,工程师,主要研究方向为电力系统规划设计及新能源并网发电技术
白左霞(1987),女,硕士,高级工程师,主要研究方向为电网规划、设计和新能源消纳
张中锋(1988),男,硕士,工程师,主要研究方向为配网直流变压器。
基金资助:
河北省自然科学基金资助项目(E2021502048)

A Full-Level Modulation Strategy for Half Bridge-Full Bridge Hybrid MMC in DC Distribution Grids

ZHANG Guihong¹(), WANG Chen²(), ZHANG Xiangcheng¹, WANG Shibin¹, BAI Zuoxia³, ZHANG Zhongfeng⁴

1. State Grid Economic and Technological Research Institute of Qinghai Electric Power Company, Xining 810008, China
2. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Baoding 071003, Hebei Province, China
3. State Grid Qinghai Electric Power Company, Xining 810008, China
4. NR Electric Co., Ltd., Nanjing 211100, China

Received:2021-11-11 Online:2022-06-01 Published:2022-05-31
Contact: WANG Chen E-mail:wangchen1992ncepu@163.com
Supported by:
Natural Science Foundation of Hebei Province of China(E2021502048)

摘要/Abstract

摘要：

为改善半桥-全桥混合型子模块数量较少的模块化多电平换洗器(modular multilevel converter, MMC)运行性能,推进其在直流配电网等中低压领域的应用,提出了一种全电平逼近调制策略(full level modulation,FLM)。所提FLM利用全桥子模块(full bridge submodule,FBSM)的全电平输出能力,控制桥臂中某一FBSM运行于“脉宽调制(pulse width modulation, PWM)模式”,将所得全电平PWM波与原阶梯波叠加以进一步逼近正弦调制波。子模块工作模式由电容电压排序结果确定,相单元中任意时刻均有两个FBSM运行于“PWM模式”,输出互补的全电平PWM波。基于Matlab/Simulink的仿真结果和物理实验结果表明,在所提FLM调制策略下,交流侧电压电流质量远高于传统最近电平逼近调制策略,运行损耗、控制复杂度及循环电流均优于传统载波移相脉冲宽度调制,满足中低压领域的调制要求。

关键词: 半桥-全桥混合型MMC, 少子模块, 直流配电网, 全电平调制策略

Abstract:

In order to improve the operating performance of half bridge - full bridge hybrid modular multi-level converter (MMC) with small quantities of submodules and promote its application in medium and low voltage fields such as DC distribution grids, a novel full-level modulation (FLM) strategy is proposed in this paper. The full-level output capability of full-bridge submodule (FBSM) is utilized in the proposed FLM, where a selected FBSM in arm operates in the “PWM mode”. The obtained full-level PWM wave is superimposed with the original step wave to further approximate the sine modulation wave. The operating mode of submodules is determined by the voltage sorting result, and at any time, there are two FBSMs in the phase unit operating in the “PWM mode”, outputting complementary full-level PWM waves. The results of simulation based on Matlab/Simulink and physical experiment reveal that the quality of voltage and current on AC side under FLM is much higher than that of the conventional nearest level modulation strategy. Compared with the carrier phase-shifted pulse width modulation, FLM performs better in terms of operating loss, control complexity and circulating current, which can satisfy the modulation requirements of medium and low voltage fields.

Key words: half bridge - full bridge hybrid MMC, small quantities of submodules, DC distribution grids, full-level modulation strategy

中图分类号:

TM72

张桂红, 王琛, 张祥成, 王世斌, 白左霞, 张中锋. 一种适用于直流配电网中半桥-全桥混合型MMC的全电平逼近调制策略[J]. 电力建设, 2022, 43(6): 75-83.

ZHANG Guihong, WANG Chen, ZHANG Xiangcheng, WANG Shibin, BAI Zuoxia, ZHANG Zhongfeng. A Full-Level Modulation Strategy for Half Bridge-Full Bridge Hybrid MMC in DC Distribution Grids[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(6): 75-83.

图/表 14

图1 FBSM装配比为50%的半桥-全桥混合型MMC拓扑

Fig.1 Topology of half bridge - full bridge hybrid MMC where 50% of the submodules are FBSM

图2 NLM调制策略原理

Fig.2 Modulation principle of NLM strategy

图3 CPS-PWM调制策略原理

Fig.3 Modulation principle of CPS-PWM strategy

图4 全电平逼近调制策略原理

Fig.4 Schematic diagram of full-level modulation strategy

图5 相单元中“PWM”模式下的FBSM输出电压

Fig.5 Output voltage waveforms of the two FBSMs under the “PWM mode” in the phase unit

图6 子模块工作模式确定流程

Fig.6 Flow chart for determining the mode of SMs

图7 单端MMC仿真模型

Fig.7 Simulation model of single-terminal MMC

表1 仿真模型参数

Table 1 Parameters of simulation model

图8 FLM调制策略仿真结果

Fig.8 Simulation results of FLM strategy

图9 三种调制策略下运行性能对比

Fig.9 Comparison of operating characteristics among three modulation strategies

图10 三种调制策略下电压质量、电流质量与开关损耗对比

Fig.10 Comparison of voltage quality, current quality and switching loss among three modulation strategies

图11 单端MMC实验平台

Fig.11 Experiment platform of single-terminal MMC

表2 实验平台参数

Table 2 Parameters of experiment platform

图12 FLM调制策略实验结果

Fig.12 Experiment results of FLM strategy

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一种适用于直流配电网中半桥-全桥混合型MMC的全电平逼近调制策略

A Full-Level Modulation Strategy for Half Bridge-Full Bridge Hybrid MMC in DC Distribution Grids

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