基于开关函数的脉冲功率负载大信号模型研究

doi:10.19595/j.cnki.1000-6753.tces.190849

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摘要

以现代电子雷达为代表的脉冲功率负载包含了大量电力电子开关器件, 工作周期通常为10^-2~10^-1s级, 若接入独立微电网运行, 将给系统的安全稳定带来极大挑战。为研究脉冲功率负载接入对独立微电网系统稳定性的影响, 提出基于开关函数的脉冲功率负载大信号模型。该模型基于脉冲功率负载等效拓扑结构, 以三相不可控整流器、Buck变换器和直流开关负载为核心, 通过分析整流器、变换器和直流开关负载各开关器件的工作状态及相应开关函数, 建立脉冲功率负载与外部电网接口的电压电流动态方程。分析结果表明, 采用上述模型所得出的柴油发电机组——脉冲功率负载系统频率波动率δ_f和直流电压波动率δ_u_{_dc}的分析结论与实验结果相一致, 验证了所提出脉冲功率负载大信号模型的正确性。

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关键词 ：脉冲功率负载, 等效拓扑, 大信号模型, 独立微电网

Abstract：

As the representative of pulsed power load (PPL), the modern electronic radar contains a large number of power-electronic devices, and the working cycle of the radar usually ranges from 10-2s to 10-1s. If it is connected to an isolated microgrid, its operation mode will bring great challenges to the safety and stability of the microgrid system. In order to analyze the influence of PPL on the stability of the isolated microgrid, this paper proposed a large-signal model for PPL based on the switching functions. This model adopted a novel equivalent topology of PPL, which consists of a three-phase diode rectifier, a Buck converter and a DC switching load. By analyzing the operation states and switching functions of power electronic components for the rectifier, converter and switching load, this model established the equations of dynamic voltages and currents for the interface between the PPL and the external grid. Based on the PPL modeling, a diesel generator system with PPL could be modeled, and the corresponding indicators such as the fluctuation ratios of frequency and DC voltage, δf and δu_dc respectively, could be analyzed. The analyzing results indicate that the tendencies of δf and δu_dc solved by the model consist with those from the test under the same conditions, which verifies the correctness of the proposed large-signal model for PPL.;

Key words： Pulsed power load equivalent topology large-signal model isolated microgrid

收稿日期: 2019-07-17

PACS:

TM71

通讯作者: 沈沉男, 1970年生, 博士, 教授, 研究方向为电力系统的分析与控制。E-mail: shenchen@mail.tsinghua.edu.cn

作者简介: 严鋆男, 1985年生, 博士, 研究方向为独立微电网分析与保护。E-mail: yanjunnorton@126.com

引用本文:

严鋆, 王金全, 陈颖, 黄克峰, 沈沉. 基于开关函数的脉冲功率负载大信号模型研究[J]. 电工技术学报, 2020, 35(16): 3509-3517. Yan Jun, Wang Jinquan, Chen Ying, Huang Kefeng, Shen Chen. Study on Large-Signal Model for Pulsed Power Load Based on Switching Functions. Transactions of China Electrotechnical Society, 2020, 35(16): 3509-3517.

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