减小逆变器下垂控制中虚拟阻抗所致电压偏差的方法研究

陆善婷; 杨敏红; 程军照

减小逆变器下垂控制中虚拟阻抗所致电压偏差的方法研究

1.
上海工程技术大学工程实训中心,上海 201620;
2.
国网上海市电力公司市南供电公司,上海 201100;
3.
云南电网有限责任公司电网规划研究中心,云南昆明 650011

基金项目: 上海工程技术大学实践教学建设自助项目(p201724005)

详细信息

作者简介:
陆善婷(1988-),女,实验师,硕士,主要研究方向为配电网和分布式发电,E-mail:lu0910@yeah.net;杨敏红(1989-),女,工程师,硕士研究生,主要研究方向为电气试验研究工作,E-mail:ymhong2012@163.com;程军照(1982-),通信作者,男,硕士,高级工程师,主要从事分布式发电和微电网相关研究工作,E-mail:chengjunzhao@126.com。

中图分类号: TM46
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出版历程
- 收稿日期: 2018-01-02
- 修回日期: 2018-12-17
- 发布日期: 2018-12-08

Reduction of Voltage Deviation Induced by Virtual Impedance in Droop Control of Parallel Inverters

1.
Engineering Practical Training Center, Shanghai University of Engineering Science,Shanghai 201620, China;
2.
Southern Urban Branch of Shanghai Electric Power Company, SGCC, Shanghai 201100;China;
3.
Power Grid Planning and Research Center, Yunnan Power Grid Corporation, Kunming 650011, China

摘要

摘要: 虚拟阻抗可以灵活改变线路阻抗,和下垂控制结合可取得较好效果,在微网中应用广泛。但虚拟阻抗会导致电压偏差,目前该问题尚无有效的解决方法。针对这一问题,本文将虚拟阻抗和功率坐标变换结合,对有功P及无功Q进行功率坐标变换,得到广义有功P_d和广义无功Q_d。根据微网总负荷的功率因数选取虚拟阻抗角,使虚拟阻抗造成的电压降落的纵分量为零,从而大幅减小电压偏差。采用P_df下垂,舍弃Q_dU下垂,按照逆变器容量的反比选择下垂系数和虚拟阻抗值的大小。通过上述措施实现了有功P和无功Q的按比例分担并大幅减小了电压偏差,仿真证明了本文所提方法的有效性。
- 微网 /
- 下垂控制 /
- 虚拟阻抗 /
- 功率坐标变换 /
- 电压偏差
Abstract: Virtual impedance is widely used in the microgrid since it can change line impedance as required and achieve the favorable effect when combined with the droop control. However, the virtual impedance will bring about the voltage deviation, which cannot be solved by using present methods. Aiming at this problem, this paper combines virtual impedance and power coordinate transformation to implement power coordinate transformation for active power P and reactive power Q, by which general active power P_d and reactive power Q_d is got. Virtual impedance angle is chosen according to power factor of microgrid's total load so as to eliminate the longitudinal component of voltage drop deviation due to virtual impedance, by which voltage deviation is reduced greatly. Droop control P_df is adopted and Q_dU is abandoned while droop coefficients are chosen in inverse proportion to rated capacity of inverters and impedance virtual magnitude is chosen in inverse proportion to rated capacity of inverters. In this way, proportional sharing of active power P and reactive power Q are realized while voltage deviation is reduced. The simulation confirms the effectiveness of the proposed method in this paper.
- microgrid /
- droop control /
- virtual impedance /
- power coordinate transformation /
- voltage deviation

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参考文献(14)

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施引文献(10)

期刊类型引用(2)

1.	朱作滨，黄绍平，李振兴. 孤岛型微网并联逆变器下垂控制策略研究. 电力系统及其自动化学报. 2020(02): 119-124 . 百度学术
2.	余巧，张巧杰，李云侠. 一种提高无功分配精度的下垂控制策略. 电机与控制应用. 2020(02): 86-90 . 百度学术

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减小逆变器下垂控制中虚拟阻抗所致电压偏差的方法研究

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Reduction of Voltage Deviation Induced by Virtual Impedance in Droop Control of Parallel Inverters

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其他类型引用(8)

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