Phase-shift Control Strategy of Modular Multilevel High-frequency DC Transformer Based on Multi-objective Performance Optimization

ZHANG Huanqing; ZHANG Mujie; WANG Yu; TANG Yang

doi:10.13296/j.1001-1609.hva.2019.09.003

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Phase-shift Control Strategy of Modular Multilevel High-frequency DC Transformer Based on Multi-objective Performance Optimization

更新时间：2025-04-26

- Phase-shift Control Strategy of Modular Multilevel High-frequency DC Transformer Based on Multi-objective Performance Optimization
- High VoltageApparatus Vol. 55, Issue 9, Pages: 18-25+33(2019)
- 作者机构：
  
  1. 国家电网湖北省电力公司
  2. 国家电网公司华中分部
  3. 广东工业大学自动化学院
  4. 三峡大学电气与新能源学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2019.09.003
  CLC： TM41
- Published：2019
- 稿件说明：
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[1]张焕青,张慕婕,王裕,唐阳.基于多目标性能优化的模块化多电平高频直流变压器移相控制策略[J].高压电器,2019,55(09):18-25+33.

ZHANG Huanqing, ZHANG Mujie, WANG Yu, et al. Phase-shift Control Strategy of Modular Multilevel High-frequency DC Transformer Based on Multi-objective Performance Optimization[J]. High voltageapparatus, 2019, 55(9): 18-25+33.
[1]张焕青,张慕婕,王裕,唐阳.基于多目标性能优化的模块化多电平高频直流变压器移相控制策略[J].高压电器,2019,55(09):18-25+33. DOI： 10.13296/j.1001-1609.hva.2019.09.003.

ZHANG Huanqing, ZHANG Mujie, WANG Yu, et al. Phase-shift Control Strategy of Modular Multilevel High-frequency DC Transformer Based on Multi-objective Performance Optimization[J]. High voltageapparatus, 2019, 55(9): 18-25+33. DOI： 10.13296/j.1001-1609.hva.2019.09.003.

摘要

高频直流变压器（high-frequency DC transformer

HDCT）是直流电网的关键设备。为了满足中高压直流电网母线互联、电压变换、功率双向传输和电气隔离的需求

两端皆为模块化多电平变换器（modular multilevel converter

MMC）结构的模块化多电平高频直流变压器（modular multilevel DC transformer

M2DCT）尤受关注。目前

移相控制是提高M2DCT性能的有效方法之一

而现有的移相控制方法主要优化M2DCT的单一特性。因此

为了同时降低电流应力

最小化功率损耗

改善软开关特性

实现M2DCT性能的多目标综合优化

提出了一种基于多目标性能优化的双相移（dual-phase-shift

DPS）控制策略。建立M2DCT电流应力

功率损耗和软开关特性的数学模型

提出多目标性能优化DPS的控制策略。通过M2DCT样机实验结果

验证了所提策略的有效性和优越性。

Abstract

The high-frequency DC transformers（DCTs）are important equipment in DC grids.To satisfy the requirements of buses connection

voltage conversion

bidirectional power transmission and electrical isolation in MVDC and HVDC grids

the modular multilevel DC transformer（M2DCT）with modular multilevel converter（MMC）topology is developed.Currently

the phase-shift control is one of the most effective ways to improve M2DCT performance However

the existing phase-shift strategies mainly optimize a single characteristic of M2DCT.Therefore

to reduce current stress

minimize power loss and improve soft switching characteristics

achieving the comprehensive optimization for M2DCT

a multi-objective optimization control strategy based on dual-phase-shift（DPS）scheme is proposed in this paper.The mathematical model of current stress

power loss and soft-switching performers in M2DCT are established

and the control principle and framework of proposed multi-objective optimization DPS strategy is investigated.The experimental results in M2DCT prototype are presented to verify the correctness and effectiveness of the proposed strategy.

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