基于<em>P</em>-<em>U</em>下垂特性的虚拟直流电机控制策略

doi:10.19595/j.cnki.1000-6753.tces.200102

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摘要直流微电网中传统P-U下垂控制由于只具备下垂特性、缺乏惯性,无法抑制直流母线电压波动,当网内功率突变时,直流母线电压瞬态特性较差,平稳性低。为抑制直流母线电压波动,提升直流母线电压动态稳定性,提出一种基于P-U下垂特性的虚拟直流电机（VDCM）控制策略。通过模拟直流电机机械惯性,将直流电机机电暂态响应过程与下垂控制特性进行等效,设计直流电压源变换器（VSC）P-U下垂控制环路,使直流变换器具备直流电机大惯性、高阻尼输出特性,有效地提升了母线电压动态稳定性,抑制直流母线电压波动。该文建立虚拟直流电机控制策略小信号模型,分析控制策略动作具体机理及系统稳定性,并与传统P-U下垂控制进行对比,通过仿真及实验验证了该策略的有效性。

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	支娜
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关键词 ：直流微电网, P-U下垂特性, 机械惯性, 虚拟直流电机控制

Abstract：The traditional P-U droop control in DC microgrid only has drooping characteristic and a lack of inertia, which is unable to suppress voltage fluctuation. The sudden fluctuation of the power in the network can cause voltage overshoot. In order to suppress the voltage fluctuations and improve the transient behaviors of the bus voltage, a virtual DC motor control strategy based on the P-U droop characteristics is proposed. By simulating the mechanical inertia characteristics of the DC motor to adjust the P-U droop control loop, the large inertia and high damping output characteristic of the DC motor can be realized in the DC VSC. The specific mechanism of the VDCM control is analyzed, and the effectiveness of the proposed method is verified by the comparative simulation and experiments with the traditional P-U droop control base on the micro-grid experiment platform.

Key words： DC microgrid P-U droop characteristics mechanical inertia characteristics virtual DC motor control

收稿日期: 2020-02-04

PACS:

TM351

基金资助:国家自然科学基金面上项目（51877175）、陕西省重点项目（2017ZDXM-GY-003）和陕西省自然基金项目（2017JM5100）资助

通讯作者: 支娜女,1976年生,副教授,研究方向为新能源发电及微电网控制。E-mail: zhina@xaut.edu.cn

作者简介: 丁可男,1995年生,硕士研究生,研究方向为直流微电网及其协调控制。E-mail: 1597436271@qq.com

引用本文:

支娜, 丁可, 黄庆辉, 李武华, 张辉. 基于P-U下垂特性的虚拟直流电机控制策略[J]. 电工技术学报, 2021, 36(6): 1238-1248. Zhi Na, Ding Ke, Huang Qinghui, Li Wuhua, Zhang Hui. A Virtual DC Motor Control Strategy Based on P-U Drooping Characteristics. Transactions of China Electrotechnical Society, 2021, 36(6): 1238-1248.

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