电力系统保护与控制2025，Vol.53Issue(12)：82-93,12.DOI:10.19783/j.cnki.pspc.240652
正序分量合成零序电压与过调制补偿相结合的HCSY-MG功率平衡控制
Power balance control for HCSY-MG based on positive-sequence component synthesized zero-sequence voltage and overmodulation compensation
摘要
Abstract
In half-bridge converter series Y-connection microgrid(HCSY-MG)systems,environmental factors such as wind speed and solar irradiance cause significant variations in the output power of individual wind and solar micro-sources.This results in imbalanced three-phase output power,leading to asymmetry in grid-connected currents,which can severely affect the system's grid-connected operation.To address this issue,a control method combining positive-sequence component synthesized zero-sequence voltage injection with overmodulation compensation is proposed.This method synthesizes the zero-sequence voltage using a positive-sequence component that are in phase with the three-phase grid voltage,simplifying the calculation process compared to traditional methods.However,the power balancing capability of zero-sequence voltage injection is limited,and the system is prone to overmodulation when the degree of three-phase power imbalance is large.To mitigate this,overmodulation compensation is introduced by modifying the zero-sequence voltage,thereby expanding the system's inter-phase power balancing range.This ensures that the system can continue to operate normally under significant inter-phase power imbalance and that the grid-connected currents meet grid code requirements.Finally,simulations and experiments verify the correctness and feasibility of the proposed control strategy.关键词
串联微电网/功率不平衡/相间功率平衡范围/零序电压/过调制补偿Key words
series microgrid/power imbalance/inter-phase power balance range/zero-sequence voltage/overmodulation compensation引用本文复制引用
王兴贵,李昱,李锦键,丁颖杰,薛晟..正序分量合成零序电压与过调制补偿相结合的HCSY-MG功率平衡控制[J].电力系统保护与控制,2025,53(12):82-93,12.基金项目
This work is supported by the National Natural Science Foundation of China(No.51967011). 国家自然科学基金项目资助(51967011) （No.51967011）
甘肃省工业过程先进控制重点实验室开放基金项目资助(2022KX08) （2022KX08）
