基于无源控制的光储直流微网虚拟惯性控制策略研究

doi:10.12096/j.2096-4528.pgt.20080

发电技术 ›› 2021, Vol. 42 ›› Issue (5): 576-584.DOI: 10.12096/j.2096-4528.pgt.20080

基于无源控制的光储直流微网虚拟惯性控制策略研究

杨继鑫¹(), 王久和¹^,²^,*(), 王勉²(), 王振业¹()

¹ 北京信息科技大学自动化学院, 北京市海淀区 100192
² 北京交通大学电气工程学院, 北京市海淀区 100044

收稿日期:2020-09-08 出版日期:2021-10-31 发布日期:2021-10-13
通讯作者: 王久和
作者简介:杨继鑫(1995), 男, 硕士研究生, 研究方向为变换器非线性控制以及多变换器稳定性等, yjx95928@163.com
王勉(1985), 男, 博士研究生, 研究方向为新能源发电以及微电网控制等, 17117421@bjtu.edu.cn
王振业(1995), 男, 硕士研究生, 研究方向为多变换器系统稳定性等, 1032406102@qq.com
基金资助:
国家自然科学基金项目(51777012);北京市自然科学基金-教委联合资助项目(KZ201911232045)

Research on Virtual Inertial Control Strategy of DC Microgrid With Photovoltaic and Storage System Based on Passivity-based Control

Jixin YANG¹(), Jiuhe WANG¹^,²^,*(), Mian WANG²(), Zhenye WANG¹()

¹ School of Automation, Beijing Information Science & Technology University, Haidian District, Beijing 100192, China
² School of Electrical Engineering, Beijing Jiaotong University, Haidian District, Beijing 100044, China

Received:2020-09-08 Published:2021-10-31 Online:2021-10-13
Contact: Jiuhe WANG
Supported by:
National Natural Science Foundation of China(51777012);Beijing Natural Science Foundation-Educational Commission Joint Funding Project(KZ201911232045)

摘要/Abstract

摘要：

为克服光储直流微网（DC microgrid with photovoltaic and storage system，DMPSS）易受功率波动和负载扰动影响的问题，提出VDCM+PBC策略，即在储能接口变换器的控制中电流内环采用无源控制（passivity-based control，PBC）策略，电压外环引入虚拟直流电机（virtual DC machine，VDCM）控制策略。仿真结果表明：与外环为VDCM、内环为PI控制策略（VDCM+PI）相比，VDCM+PBC策略可减小负载以及光伏输出功率变化时的母线电压波动，可更好地提高直流母线电压的稳定性，从而验证了所提VDCM+PBC策略的可行性。

关键词: 光储直流微网(DMPSS), 无源控制, 虚拟直流电机控制(VDCM), 母线电压波动

Abstract:

In order to overcome the susceptibility of DC microgrid with photovoltaic and storage system (DMPSS) to power fluctuations and load disturbances, a VDCM+PBC strategy was formed. That is, in the control of energy storage converter, a passivity-based control (PBC) was adopted in current-loop, and a virtual DC machine (VDCM) control strategy was introduced in voltage-loop. Simulation results show that, compared with the VDCM+PI strategy (i. e., the voltage-loop is VDCM control and the current-loop is PI control), the VDCM+PBC strategy can reduce the bus voltage fluctuations when the load and photovoltaic output power changes. The improved stability of DC bus voltage verifies the feasibility of the proposed VDCM+PBC strategy.

Key words: DC microgrid with photovoltaic and storage system (DMPSS), passivity-based control, virtual DC machine control (VDCM), fluctuation of DC bus voltage

中图分类号:

TK01
TM76

杨继鑫, 王久和, 王勉, 王振业. 基于无源控制的光储直流微网虚拟惯性控制策略研究[J]. 发电技术, 2021, 42(5): 576-584.

Jixin YANG, Jiuhe WANG, Mian WANG, Zhenye WANG. Research on Virtual Inertial Control Strategy of DC Microgrid With Photovoltaic and Storage System Based on Passivity-based Control[J]. Power Generation Technology, 2021, 42(5): 576-584.

图/表 15

图1 DMPSS拓扑结构

Fig.1 Topology of DMPSS

图2 双向DC-DC变换器等效拓扑

Fig.2 Equivalent topology of bidirectional DC-DC converter

图3 双向DC-DC变换器的小信号等效电路

Fig.3 Small signal equivalent circuit of bidirectional DC-DC converter

图4 电流环的小信号模型

Fig.4 Small signal model of current loop

图5 ΔiL的单位阶跃响应

Fig.5 Unit step response of ΔiL

图6 直流电机模型

Fig.6 DC machine model

图7 VDCM控制框图

Fig.7 Block diagram of VDCM contro

图8 J和DF对Tm的影响

Fig.8 Impacts of J and DF on Tm

图9 DMPSS控制框图

Fig.9 Block diagram of DMPSS control

表1 仿真参数

Tab. 1 Parameters of simulation

参数	数值	参数	数值
v_ba/V	140	ω_n/(rad/s)	80
L_ba/mH	2	r/Ω	1
C₁/μF	1 100	阻尼系数D_F	5
r_b1	10	开关频率f_s/kHz	10

图10 负载突变时的仿真结果

Fig.10 Simulation results when the load step-changes

图11 不同J和负载情况下的vbus仿真结果

Fig.11 Simulation results of vbus under different J and load

图12 光伏输出功率突变时的仿真结果

Fig.12 Simulation results when the photovoltaic output power step-changes

图13 不同J和输出功率情况下的vbus仿真结果

Fig.13 Simulation results of vbus under different J and output power

表2 直流母线电压动态响应指标比较

Tab. 2 Index comparison of dynamic response of DC bus voltage

条件	指标	VDCM+PBC	VDCM+PI
负载变化	Δv_bus1, Δv_bus2/V	18.6, 26.6	23.5, 34.0
负载变化	t_r1, t_r2/s	0.35, 0.40	0.25, 0.26
光伏输出	Δv_bus1, Δv_bus2/V	47.6, 25.2	62.0, 33.8
功率变化	t_r1, t_r2/s	0.45, 0.42	0.26, 0.28

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基于无源控制的光储直流微网虚拟惯性控制策略研究

Research on Virtual Inertial Control Strategy of DC Microgrid With Photovoltaic and Storage System Based on Passivity-based Control

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