基于旋转潮流控制器的用户侧电压调控方法

doi:10.19595/j.cnki.1000-6753.tces.L10068

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Abstract

In view of the problem of user-side voltage exceeding the limit and voltage fluctuation caused by a high proportion of photovoltaic grid connection, a rotary power flow controller (RPFC) consisting of a rotary phase shifting transformer (RPST) can be used for voltage regulation and control. This paper compared the voltage regulation of RPST and RPFC. The voltage regulation strategy of RPST mainly consists of two parts: power factor limitation and output voltage phase control. RPST connects a series output voltage with fixed amplitude and adjustable phase in the line by changing the phase θ_RPST .During the voltage regulation of RPST, there is a certain phase offset δ between the voltages Û₁ and Û₂, this offset will cause a phase shift between the ? and Û₁, resulting in a change in the line power factor. To ensure that the line power factor meets the minimum specified requirements, the regulation range of RPST should be limited.
The RPFC control strategy consists of three parts: output voltage amplitude calculation, rotation angle control and speed coordination control. RPFC regulates the output voltage amplitude ΔU_RPFC by adjusting the rotation angles α₁ and α₂, keeping the phase constant. To ensure that the stator voltages Û_st1 and Û_st2 are symmetrical about the Û₁, the speed of the servo motor is adjusted to keep the rotation angle always satisfying a1+a2=0 to achieve the coordinated regulation of speed.
This paper developed an RPFC experimental prototype and built a voltage regulation scenario at 220V voltage level to compare and analyze the voltage regulation capability of RPST and RPFC in terms of steady and transient control characteristics, respectively. In terms of steady-state control characteristics, the rotation angle of the voltage regulator is adjusted and the load power remains unchanged. In the process of RPST regulation, the voltage phase shift between Û₁ and Û₂ tend to increase and then decrease. In the process of RPFC regulation, the voltage phase shift is not generated. In terms of transient control characteristics, the load power is changed and the Û₂ is set to 220V. Both RPFC and RPST can control the Û₂ within the set range. In the process of RPST regulation, the line power factor does not meet the specified requirements. In the process of RPFC regulation, the line power factor is consistent with the power factor without regulator.
The following conclusions can be drawn from the experiments analysis: (1) The control structure of RPST is relatively simple. However, RPST changes the user-side voltage phase in the regulation process, resulting in phase shift between line voltages, its regulation range will be limited by the power factor. (2) RPFC indirectly controls the output voltage amplitude by adjusting the magnitude of the rotation angle to achieve closed-loop control of the user-side voltage, and quantifies the duty cycle of the servo motor according to the deviation of the rotation angle from its set value to achieve coordinated control of the rotation angle speed and ensure that RPFC does not produce voltage phase shift during voltage regulation. (3) The experimental results show that both RPST and RPFC can realize voltage regulation, but RPST will change the line power factor during the regulation process, while RPFC always keeps the power factor constant during the regulation process, which has better application prospects.

Key words： Rotary phase shifting transformer rotary power flow controller voltage regulation comparison experiments

Received: 13 January 2023

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	Yan Xiangwu
	Peng Weifeng
	Shao Chen
	Jia Jiaoxin
	Li Tiecheng

Cite this article:

Yan Xiangwu,Peng Weifeng,Shao Chen等. User-Side Voltage Regulation Method Based on Rotary Power Flow Controller[J]. Transactions of China Electrotechnical Society, 0, (): 147-147.

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