| 引用本文: | 张骞,李征,蔡旭,饶芳权.一种电网强度在线感知的自适应虚拟同步控制策略[J].电力系统保护与控制,2019,47(21):117-125.[点击复制] |
| ZHANG Qian,LI Zheng,CAI Xu,RAO Fangquan.An adaptive VSG control strategy based on online grid impedance measurements[J].Power System Protection and Control,2019,47(21):117-125[点击复制] |
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| 摘要: |
| 微电网中的储能虚拟同步发电机(virtual synchronous generator, VSG)需在并网和微电网等不同强度电网工况下切换运行。为提高VSG在工况切换前后的一次调频特性与动态响应特性，采用小信号建模与广义根轨迹分析的方法，通过向阻尼环节引入微分，提高VSG一次调频响应的准确性。建立了VSG参数与电网强度的关系，基于对电网强度的在线感知，设计自适应优化虚拟阻尼的方法，使得VSG在电网强度变化前后均具有良好的一次调频特性与动态响应特性。在RTDS-DSP硬件在环半实物仿真实验平台上构建了光-储-柴微电网模型，通过相关实验验证了所提方法的有效性。 |
| 关键词: 虚拟同步控制 一次调频 电网强度 自适应 硬件在环 |
| DOI：10.19783/j.cnki.pspc.181522 |
| 投稿时间：2018-12-05修订日期：2019-04-15 |
| 基金项目:国家重点研发计划项目资助(2018YFB0904005) |
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| An adaptive VSG control strategy based on online grid impedance measurements |
| ZHANG Qian,LI Zheng,CAI Xu,RAO Fangquan |
| (School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;School of Information Science and Technology, Donghua University, Shanghai 201620, China) |
| Abstract: |
| Virtual Synchronous Generator (VSG) requires to be shifted between grid-connected state and micro-grid state, which have different grid strength. Aiming to keep precise Primary Frequency Regulation (PFR) ability and dynamic response characteristics of VSG, a modification of VSG control loop is proposed based on the small signal analysis and generalized root locus analysis to improve the precision of PRF by introducing differential element to the virtual damping, and an adaptive virtual damping optimization method is proposed to keep the dynamic response characteristics constant under different grid conditions. A micro-grid model is established on the Real Time Digital System (RTDS) and DSP united hardware-in-the-loop (HIL) platform, which contains PV, BESS and the diesel generator, experiment results demonstrate the effectiveness of the proposed method. This work is supported by National Key Research and Development Program of China (No. 2018YFB0904005). |
| Key words: virtual synchronous generator primary frequency regulation power grid strength adaptive control hardware-in-the-loop |
