面向“花瓣型”配电网的旋转潮流控制器两阶段转速功率控制策略

doi:10.19595/j.cnki.1000-6753.tces.232053

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摘要

随着有源配电网建设的迅猛发展,“花瓣型”配电网成为主流供电结构,为保障配电系统的安全供电,应当进一步研究适用于有源配电网的功率控制方法。电磁式旋转潮流控制器（RPFC）是有源配电网功率控制的一种可行方案。本文首先构建了基于瞬时无功理论的RPFC稳态功率解耦控制模型,然而由于旋转移相变压器转子位置角的协调控制难点,难以实现功率稳定控制。在此基础上,通过伺服电机两阶段转速控制和转速协调方案实现两转子角的稳定、无差控制,满足高精度、高可靠性和快速响应的功率调节需求。研制了380 V/40 kV·A的RPFC样机及实验平台,并进行了功率调控和功率均衡实验,结果表明,所提控制方案能够在秒级实现调控,且控制精度保持在4%以内,具有良好的动、静态性能,能够满足未来“花瓣型”配电网的柔性合环运行。

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	邵晨
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关键词 ： “花瓣型”配电网, 旋转潮流控制器, 功率控制, 两阶段转速控制

Abstract：

With the rapid development of active distribution network construction, the "petal-type" distribution network has become the mainstream power supply structure, which significantly improves the reliability of power supply compared with the radiation-type distribution network, but also shows the characteristics of uncontrollable power size and direction. Therefore, an electromagnetic rotating current controller (RPFC) control device is proposed, which can effectively control the power at the closing point of the loop, ensure the safe operation of the closing loop, and thus significantly improve the power supply reliability of the distribution network.
The RPFC consists of two sets of rotary phase-shifting transformers (RPSTs), which are similar to a transformer at rest, and the relative rotation of the stator-rotor angles of the phase-shifting transformers is achieved through the physical association of servo motors and the stator cores of the phase-shifting transformers, and the specific phase-angle difference is related to the relative angles of the stator-rotor angles, α₁ and α₂. Finally, the two RPST stator voltage vectors are superimposed to achieve the stringing of a voltage vector with adjustable amplitude and phase angle in the line.
Firstly, the power decoupling model of distribution network based on RPFC is constructed, and after RPFC is put into operation, the power at the closing loop point can be effectively controlled by adjusting the amplitude and phase angle of the voltage strung into the line.
Then, the research of RPFC two-stage speed control method is carried out. The RPFC power decoupling model includes the power ring, voltage ring, and angle ring, while the control effect of fixed speed is poor when Δα₁ and Δα₂ output servo motor speed based on the angle ring. This is because the power regulation time is longer under low speed regulation (the RPST speed is about 1°/s). And under high speed regulation (the speed of RPST is about 6°/s) may bring the problem of rotor angle overshooting, at this time, the power ring and voltage ring will lag behind the angle ring, and it is difficult to stabilise into the speed co-ordination adaptive stage, which makes the stability of the control system reduced, and in some cases leads to the problem of rotor angle oscillation. Therefore, a two-stage speed control scheme is designed to achieve a fast and stable response of power control. The first stage is the fast power response regulation process, which aims to quickly reach the set power range and reduce the regulation time (acting on the speed of the servo motor driver); the second stage is the speed coordination and adaptive control process, which aims to reduce the overshooting of the rotor angle to avoid the oscillation problem, and to improve the stability of RPFC Regulation stability (acting on the pulse wave)
Finally, a 380 V/40 kV·A RPFC prototype and experimental platform are developed, and power regulation and power balancing experiments are carried out. The results show that the proposed control scheme is capable of achieving regulation at the second level, and the control accuracy is kept within 4%, with good dynamic and static performance, and it is able to satisfy the future "petal-type" power distribution network of flexible closed-loop operation. The results show that the proposed control scheme can achieve regulation in seconds and keep the control accuracy within 4%.

收稿日期: 2023-12-10

PACS:

TM761

基金资助:

国家自然科学基金资助项目（51777162）.

通讯作者: 颜湘武男,1965年生,博士,研究方向为新能源电力系分析与控制、现代电力与变换、新型储能与节能等。E-mail：xiangwuy@ncepu.edu.cn

作者简介: 邵晨男,1995年生,博士生,研究方向为潮流控制器理论及控制。E-mail：shaochen@ncepu.edu.cn

引用本文:

邵晨, 颜湘武, 贾焦心, 吴炜林, 李秉桢. 面向“花瓣型”配电网的旋转潮流控制器两阶段转速功率控制策略[J]. 电工技术学报, 0, (): 11-. Shao Chen, Yan Xiangwu, Jia Jiaoxin, Wu Weilin, Li Bingzhen. Two-Stage Speed-Power Control Strategy for Rotating Power Flow Controller in "Petal-Shaped" Distribution Networks. Transactions of China Electrotechnical Society, 0, (): 11-.

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