基于混合同步的DC电压控制的小型信号同步稳定性,具有不同的内部控制环
1Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou, 510600, China. prongc@yeah.net.
Scientific reports
|March 25, 2025
概括
基于混合同步的直流电压控制 (HS-DVC) 为可再生能源提供了更好的稳定性,特别是在主动功率同步和特定的内部控制循环的情况下. 在弱电网中,它的性能优于传统的电网形成方法.
科学领域:
- 电气工程 电气工程
- 电力系统 电力系统
- 控制理论 控制理论
背景情况:
- 可再生能源 (RES) 需要对电网整合进行强有力的控制.
- 传统的电网形成直流电压控制 (GFM-DVC) 在稳定性上有局限性.
- 基于混合同步的直流电压控制 (HS-DVC) 的小信号同步稳定性需要进一步研究.
研究的目的:
- 分析HS-DVC与各种内部控制环的小信号同步稳定性.
- 为了确定增强HS-DVC稳定性的因素.
- 为了比较HS-DVC与传统GFM-DVC的性能.
主要方法:
- 开发一个闭环模型,专注于同步循环.
- 在三种内部控制循环类型 (i,ii,iii) 下评估高压DVC稳定性.
- 使用Simulink进行验证的电磁瞬态 (EMT) 模拟.
主要成果:
- 与GFM-DVC不同,HS-DVC表现出更大的惯性常数的稳定性.
- 加入主动功率同步可以显著提高HS-DVC的稳定性.
- 与I型和II型相比,III型内部控制环 (电压大小相环) 的稳定性优越.
- 在弱电网中,直流电流等效RES会对高频-DVC稳定性产生负面影响.
结论:
- 与GFM-DVC相比,HS-DVC为RES提供了增强的同步稳定性.
- 内控回路和同步策略的选择对系统稳定性产生了重大影响.
- 高压DVC为可再生能源的稳定电网集成提供了可行的解决方案,特别是在具有挑战性的电网条件下.
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