Series Resonant Megawatt-level DC Transformer for Photovoltaic DC Collection

MA Yiqing; ZHAO Biao; REN Chenglin; CUI Bin; YU Zhanqing; LU Xiang; CHEN Yue; JIAO Shi; ZENG Rong; {{custom_author.name_en}}

doi:10.13334/j.0258-8013.pcsee.250489

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Series Resonant Megawatt-level DC Transformer for Photovoltaic DC Collection

更新时间：2026-10-19

- Series Resonant Megawatt-level DC Transformer for Photovoltaic DC Collection
- Vol. 46, Issue 7, Pages: 2693-2704(2026)
- 作者机构：
  
  1. 新型电力系统运行与控制全国重点实验室(清华大学电机系)，北京市海淀区,100084
  2. 中国南方电网有限责任公司超高压输电公司,广东省,广州市,510760
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.250489
  CLC：
- Received：05 April 2026，
  
  Published：2026
- 稿件说明：
移动端阅览
MA Yiqing, ZHAO Biao, REN Chenglin, et al. Series Resonant Megawatt-level DC Transformer for Photovoltaic DC Collection[J]. 2026, 46(7): 2693-2704.
DOI：

MA Yiqing, ZHAO Biao, REN Chenglin, et al. Series Resonant Megawatt-level DC Transformer for Photovoltaic DC Collection[J]. 2026, 46(7): 2693-2704. DOI： 10.13334/j.0258-8013.pcsee.250489.

摘要

具备高变比、低成本特性的串联谐振型兆瓦级直流变压器是实现大规模光伏直流汇集的关键装备。该文提出基于集成门极换流晶闸管(integrated gate commutated thyristor，IGCT)和无损串联二极管的1.5 kV/10 MW直流变压器(IGCT-high power DC transformer，IGCT-HDCT)拓扑结构，其中，3.34 MW功率子单元采用串联谐振方式以降低IGCT开关损耗。为明确LC与LLC拓扑的适用性差异，文中首先给出IGCT-HDCT的参数设计依据与关键参数，详细分析用于串联二级管电压平衡的无损缓冲电容对谐振过程的影响；研究考虑附加谐振效应时LC和LLC拓扑在全功率范围内的软开关特性并提出开关频率的优化方法；通过建立IGCT-HDCT电流应力与开关损耗的模型，给出优化后开关频率的计算方法，并指出光伏场景下，LC拓扑将节约78.6%的开关能耗；研制IGCT-HDCT实验室样机并开展对比实验，验证拓扑软开关特性分析的正确性。该IGCT-HDCT方案已于2024年成功应用于青海格尔木1.5 kV/±15 kV/ 50 MW光伏中压直流汇集示范工程。

Abstract

Series resonant megawatt-level DC transformers with high step-up and low costs are the key equipment for large-scale photovoltaic DC collection. This paper proposes a 1.5 kV/10 MW high power DC transformer topology based on IGCTs (IGCT- HDCT) and lossless series diodes. The 3.34 MW sub-unit adopts a series resonance method to reduce IGCT switching losses. To clarify the applicability differences between LC and LLC topologies

this paper first presents the parameter design fundamentals and key specifications of the IGCT-HDCT. Subsequently

the influence of lossless snubber capacitors

used for series diode voltage balancing

on the resonance process is analyzed in detail. The soft-switching characteristics of both LC and LLC topologies across the full power range considering the additional resonant effect are studied

and an optimization method for the switching frequency is proposed. By establishing the model of currents and loss of IGCT

the optimized switching frequency is derived. It is demonstrated that the LC solution can reduce switching energy consumption by 78.6% in photovoltaic applications. A laboratory prototype of the IGCT-HDCT is developed

and comparative experiments are conducted to validate the proposed analysis. As of 2024

the proposed IGCT-HDCT solution has been applied to the 1.5 kV/±15 kV/50 MW photovoltaic medium-voltage DC collection project in Golmud

Qinghai.

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