蔡梦路, 徐晓宇, 贾秀芳, 赵成勇, 郭春义, 宣佳卓. 混合直流供电微电网系统的直流自适应调频方法[J]. 现代电力. DOI: 10.19725/j.cnki.1007-2322.2022.0358
引用本文: 蔡梦路, 徐晓宇, 贾秀芳, 赵成勇, 郭春义, 宣佳卓. 混合直流供电微电网系统的直流自适应调频方法[J]. 现代电力. DOI: 10.19725/j.cnki.1007-2322.2022.0358
CAI Menglu, XU Xiaoyu, JIA Xiufang, ZHAO Chengyong, GUO Chunyi, XUAN Jiazhuo. DC Self-Adapt Frequency Regulation Method for Hybrid DC Power Supply Microgrid System[J]. Modern Electric Power. DOI: 10.19725/j.cnki.1007-2322.2022.0358
Citation: CAI Menglu, XU Xiaoyu, JIA Xiufang, ZHAO Chengyong, GUO Chunyi, XUAN Jiazhuo. DC Self-Adapt Frequency Regulation Method for Hybrid DC Power Supply Microgrid System[J]. Modern Electric Power. DOI: 10.19725/j.cnki.1007-2322.2022.0358

混合直流供电微电网系统的直流自适应调频方法

DC Self-Adapt Frequency Regulation Method for Hybrid DC Power Supply Microgrid System

  • 摘要: 在电网换相换流器(line commutated converter,LCC)-电压源型换流器(voltage source converter,VSC)混合直流供电的微网中,微电网受扰下不可避免地会产生频率波动,为使频率在不同扰动工况下均保持在规定范围内,在LCC-VSC供电微网系统中提出了可自适应扰动变化的直流调频方法。首先理论推导了扰动后将系统频率拉入规定范围内所需的临界下垂系数,并基于此提出了自适应扰动变化的变下垂系数一次调频方法,利用直流动作的快速性将受扰后系统频率迅速控制在规定范围内。其次,由于一次调频仍为有差调节,故进而提出变参考功率二次调频控制策略。最后在PSCAD/EMTDC平台上建立仿真模型,结果表明12.5%以内的负荷变化及10%以内的光照变化时,一次调频均可使频率偏差恢复到0.2 Hz以内,15%以内的负荷变化时二次调频可实现无差调节,验证了所提策略的有效性。

     

    Abstract: Frequency fluctuations will inevitably occur when the microgrid with hybrid DC power supply of line commutated converter (abbr. LCC)-voltage source converter (abbr. VSC) is disturbed. In order to keep the frequency within the specified range under the different kinds of disturbances, a DC frequency regulation method with self-adapt disturbance changes was proposed in the LCC-VSC supplying microgrid system. Firstly, the critical droop coefficient required to pull the system frequency into the specified range after disturbance was theoretically deduced, and based on this, a primary frequency regulation method of variable droop coefficient with self-adapt disturbance changes was proposed to rapidly control the disturbed system frequency within the specified range by means of the rapidity of DC reaction. Secondly, as the primary frequency regulation is still a differential regulation, the secondary frequency regulation strategy of variable reference power was proposed. Finally, a simulation model was established on the PSCAD/EMTDC platform. The results show that when the load changes within 12.5% and the light changes within 10%, the primary frequency regulation can restore the frequency deviation to within 0.2 Hz, and when the load changes within 15%, the secondary frequency regulation can achieve zero-error frequency regulation, which verifies the effectiveness of the proposed strategy.

     

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