不平衡工况下CLLC型交直流母线接口变换器控制策略

doi:10.12204/j.issn.1000-7229.2021.11.003

电力建设 ›› 2021, Vol. 42 ›› Issue (11): 23-33.doi: 10.12204/j.issn.1000-7229.2021.11.003

• 直流电网关键装备·栏目主持宋强副教授、余占清副教授、赵彪副教授· • 上一篇下一篇

不平衡工况下CLLC型交直流母线接口变换器控制策略

孔健生, 任春光(), 秦月, 张佰富, 杨玉岗, 韩肖清

电力系统运行与控制山西省重点实验室(太原理工大学),太原市 030024

收稿日期:2021-04-29 出版日期:2021-11-01 发布日期:2021-11-02
通讯作者: 任春光 E-mail:renchunguang55@163.com
作者简介:孔健生(1997),男,硕士研究生,主要研究方向为CLLC谐振变换器的建模与控制及其在微电网中的应用;
秦月(1998),女,硕士研究生,主要研究方向为CLLC谐振变换器;
张佰富(1992),男,博士研究生,主要研究方向为微电网与智能电网和新能源发电技术;
杨玉岗(1967),男,博士,教授,博士生导师,主要研究方向电力电子技术及其磁集成技术、数据中心、新能源发电系统、电动汽车用双向直流开关电源、开关磁阻电机电磁调速系统;
韩肖清(1964),女,博士,教授,博士生导师,主要研究方向为电力系统运行与控制、新能源技术。
基金资助:
国家自然科学基金项目(51807130)

Control Strategy of CLLC-Based Interface Converter Between AC/DC Buses under Unbalanced Condition

KONG Jiansheng, REN Chunguang(), QIN Yue, ZHANG Baifu, YANG Yugang, HAN Xiaoqing

Shanxi Key Lab of Power System Operation and Control, Taiyuan University of Technology, Taiyuan 030024, China

Received:2021-04-29 Online:2021-11-01 Published:2021-11-02
Contact: REN Chunguang E-mail:renchunguang55@163.com
Supported by:
National Natural Science Foundation of China(51807130)

摘要/Abstract

摘要：

针对交流微电网电压不平衡工况下直流微电网母线电压二倍频脉动问题,提出一种适用于CLLC直流变压器的两级式双向隔离AC/DC母线接口变换器控制策略。首先,对不平衡工况下交直流母线接口变换器功率传输特性进行分析,并设计抑制交流侧负序电流的控制策略。其次,建立CLLC直流变压器的基波等效模型,并分析其电压增益和输入阻抗特性。在此基础上,考虑不平衡工况下CLLC直流变压器输入电压脉动特点,对CLLC直流变压器进行了参数优化设计并提出了基于脉动电压前馈的控制策略以抑制直流母线电压脉动。最后,通过Matlab/Simulink进行仿真,结果表明,采用所提控制策略,在交流母线电压平衡及不平衡工况下均能保证三相电流平衡的同时抑制直流母线电压脉动。

关键词: 直流微电网, 电压不平衡, 交直流母线接口变换器, CLLC直流变压器, 控制策略

Abstract:

Aiming at the problem of double-frequency pulsation of DC bus voltage in microgrid under unbalanced AC voltage condition, a control strategy for two-stage AC/DC interface converter with CLLC DC transformer is proposed, which can ensure the three-phase currents balance and suppress the voltage pulsation of DC bus under balanced and unbalanced AC bus voltage. Firstly, the power transmission characteristics of the AC/DC interface converter under unbalanced condition are analyzed, and the control strategy to suppress the negative-sequence current at the AC side is designed. Secondly, the fundamental equivalent model of CLLC DC transformer is established, and its voltage gain and input impedance characteristics are analyzed. On this basis, considering the input voltage pulsation characteristics of CLLC DC transformer under unbalanced conditions, the optimal parameter design of CLLC DC transformer is carried out and a control strategy based on the feedforward of pulsation voltage is proposed to suppress the voltage pulsation of DC bus. Finally, the Matlab/Simulink simulation results show that the proposed control strategy can ensure the three-phase currents balance and suppress the voltage pulsation of the DC bus under both balanced and unbalanced AC bus voltage.

Key words: DC microgrid, voltage imbalance, AC/DC interface converter, CLLC DC transformer, control strategyy

中图分类号:

TM46

孔健生, 任春光, 秦月, 张佰富, 杨玉岗, 韩肖清. 不平衡工况下CLLC型交直流母线接口变换器控制策略[J]. 电力建设, 2021, 42(11): 23-33.

KONG Jiansheng, REN Chunguang, QIN Yue, ZHANG Baifu, YANG Yugang, HAN Xiaoqing. Control Strategy of CLLC-Based Interface Converter Between AC/DC Buses under Unbalanced Condition[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(11): 23-33.

图/表 17

图1 两级式双向隔离AC/DC交直流母线接口变换器

Fig.1 Two-stage bi-directional isolated AC/DC interface converter

图2 前级AC/DC变换器控制框图

Fig.2 Control block diagram of front-stage AC/DC converter

图3 CLLC-DCT的基波等效模型

Fig.3 Fundamental equivalent model of CLLC-DCT

图4 电压增益M与ω*、Q的关系(k=4)

Fig.4 Relation between voltage gain M and ω*, Q (k=4)

图5 电压增益M与ω*、k的关系(Q=0.2)

Fig.5 Relation between voltage gain M and ω*, k (Q=0.2)

图6 k一定时不同Q值下的输入阻抗特性曲线

Fig.6 Characteristic curves of input impedance under different values of Q at a given k

表1 CLLC-DCT设计指标

Table 1 Design indices of CLLC-DCT

图8 Lm=2.4 mH,k=8时的电压增益曲线

Fig.8 Voltage gain curve when Lm= 2.4 mH, k=8

图9 Lm=2.4 mH,k=8时的输入阻抗特性曲线

Fig.9 Input impedance characteristic curve when Lm= 2.4 mH, k =8

图10 CLLC-DCT控制框图

Fig.10 Control block diagram of CLLC-DCT

表2 三相全桥AC/DC变换器参数

Table 2 Parameters of three-phase full-bridge AC/DC converter

图11 满载和轻载时CLLC-DCT原边开关管驱动和开关管输出电容电压波形

Fig.11 Waveforms of switch drive and capacitor voltage on the primary side of CLLC-DCT with full load or light load

表3 不同仿真的控制策略

Table 3 Control strategies for different simulations

图12 仿真1波形

Fig.12 The waveform of simulation 1

图13 仿真2波形

Fig.13 The waveform of simulation 2

图14 仿真3波形

Fig.14 The waveform of simulation 3

图15 仿真4波形

Fig.15 The waveform of simulation 4

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不平衡工况下CLLC型交直流母线接口变换器控制策略

Control Strategy of CLLC-Based Interface Converter Between AC/DC Buses under Unbalanced Condition

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