基于余弦定理的旋转潮流控制器功率解耦控制方法

doi:10.19595/j.cnki.1000-6753.tces.220554

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Abstract

With the fluctuation and randomness of high proportional distributed power sources changing the original grid structure of the distribution network, improving the controllability and stability of the power flow will become the focus of the distribution network, and the development of rotary power flow controller (RPFC) with line power decoupling control function gradually becomes the key to solve the problems. The RPFC consists of two rotary phase shift transformers with their rotor windings connected in parallel and stator windings in series. The RPFC can be equated to a variable output voltage source in series with the internal impedance. The output voltage amplitude and phase are continuously adjustable, and the adjustment is related to the rotation angle α₁ and α₂. Since the change of RPFC output voltage amplitude ΔU and phase φ will affect both active and reactive line power, it's necessary to analyze its control strategy to realize the decoupling control of RPFC on active and reactive line power.
An RPFC power decoupling control method based on the cosine theorem is shown in Fig.1. Firstly, the amplitude and phase of each phasor are calculated based on the cosine theorem and virtual power, and the dq-axis components of each voltage phasors are obtained. Secondly, the line power P_k and Q_k at both ends of the RPFC are measured, and the P_k^* and Q_k^* are obtained after PI closed-loop control. Furthermore, the f(U_k) and g(U_k) are obtained from the U_k, U_k_d and U_k_q, respectively, and the dq-axis component settings of the RPFC output voltage ΔU_{d_set} and ΔU_{q_set} are calculated. The ΔU_d and ΔU_q are adjusted respectively according to the deviation of the RPFC output voltage and the actual value of the dq-axis components, and they are synthesized to obtain the output voltage amplitude and phase settings ΔU_set and φ_set. Finally, the rotation angle setting values α_{1_set} and α_{2_set} are calculated according to the output voltage amplitude and phase setting values, and the RPFC rotation angles α₁ and α₂ are adjusted after PI closed-loop control to continuously adjust the output voltage amplitude and phase to control the active and reactive power within the setting range respectively, which realizes the decoupling control of active and reactive power of the line and is of great significance to improve the system reliability.

Fig.1 Scheme diagram of RPFC regulating line power
An experimental RPFC prototype with a capacity of 40 kV·A is developed and a power flow control scenario at 380 V voltage level is set up. The control experiments are conducted by changing the line power setting value and load power magnitude. The RPFC can control the active and reactive line power within the set range when the conditions change, which verifies the feasibility and effectiveness of the decoupling control of active and reactive power. The following conclusions can be drawn from the experiments analysis: (1) RPFC can output continuously adjustable synthesized voltage in amplitude and phase by adjusting the two rotation angles to realize continuous decoupling control of line active and reactive power. (2) When the line power setting values change or the load power fluctuates, RPFC can decoupled to control the line active and reactive power within the setting ranges, which has a good control effect. (3) The RPFC is one of the effective solutions for precise regulation of line power and flexible interconnection between regions, and the proposed control strategy provides a technical reference for the practical engineering application of RPFC.

Key words： Active distribution network rotary power flow controller cosine theorem coordinate transformation decouple control

Received: 08 April 2022

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TM712

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	Jia Jiaoxin
	Peng Weifeng
	Yan Xiangwu
	Shao Chen
	Li Tiecheng

Cite this article:

Jia Jiaoxin,Peng Weifeng,Yan Xiangwu等. Research on Power Decoupling Control Method Rotary Power Flow Controller Based on Cosine Law[J]. Transactions of China Electrotechnical Society, 2023, 38(13): 3425-3435.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220554 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I13/3425

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