| 引用本文: | 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.[点击复制] |
| WANG Xinggui,LI Yu,LI Jinjian,DING Yingjie,XUE Sheng.Power balance control for HCSY-MG based on positive-sequence component synthesized zero-sequence voltage and overmodulation compensation[J].Power System Protection and Control,2025,53(12):82-93[点击复制] |
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| 摘要: |
| 在微源半桥变流器串联结构星型连接微电网(half-bridge converter series Y-connection microgrid, HCSY-MG)系统中，由于环境因素(如风速、光照等)影响，各风、光微源的输出功率存在显著差异，导致系统三相输出功率不一致，进而引发三相并网电流不对称，严重影响系统的并网运行。为解决该问题，提出了一种正序分量合成零序电压注入和过调制补偿相结合的控制方法。该方法利用与三相电网电压同相位的正序分量合成零序电压，与传统方法相比，简化了计算过程。然而，零序电压注入的功率平衡能力有限，当三相功率不平衡程度较大时，系统容易发生过调制。为此，过调制补偿通过修改零序电压，进一步扩大了系统的相间功率平衡范围，从而确保在相间功率不平衡的情况下，系统仍然能够正常运行，且并网电流能够满足并网要求。最后，通过仿真和实验验证了所提控制策略的正确性与可行性。 |
| 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 |
| DOI：10.19783/j.cnki.pspc.240652 |
| 投稿时间：2024-05-29修订日期：2024-08-07 |
| 基金项目:国家自然科学基金项目资助(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) |
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| Power balance control for HCSY-MG based on positive-sequence component synthesized zero-sequence voltage and overmodulation compensation |
| WANG Xinggui1,LI Yu1,LI Jinjian1,DING Yingjie1,XUE Sheng1,2 |
| (1. College of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Gansu Advanced Control for Industrial Processes, Lanzhou 730050, China) |
| 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. |
| Key words: series microgrid power imbalance inter-phase power balance range zero-sequence voltage overmodulation compensation |
