Control Strategy of Hybrid Unified Power Flow Controller to Suppress Wind Power Sub-synchronous Oscillation

doi:10.12204/j.issn.1000-7229.2021.09.006

Abstract

Abstract:

The hybrid unified power flow controller (HUPFC) combines the advantages of unified power flow controller (UPFC) and ‘Sen’ transformer (ST), so HUPFC is widely applied in power flow control of the power system. However, little literature has studied the application of HUPFC to suppress sub-synchronous oscillation (SSO). To solve the problem of SSO in double-fed induction generator (DFIG) based wind farm connected to series compensated transmission system, a suppression strategy is proposed in the paper on the basis of the supplementary active resistance control (SARC) of HUPFC. Firstly, the principle of HUPFC and the suppression mechanism for SSO are introduced. Then, the SARC strategy is designed. By tracking sub-synchronous current in the transmission line, the SARC strategy makes HUPFC inject a sub-synchronous voltage which has the same phase as the sub-synchronous current and variable amplitude to the grid. Thereby, the system equivalent resistance is increased to a positive value to suppress SSO. Finally, the parameters design method of SARC is introduced and a detailed simulation model is carried out in PSCAD/EMTDC using the data of an actual wind farm in North China. The results of the frequency scanning and the time domain simulation both show that the proposed SARC strategy of HUPFC can effectively suppress SSO in DFIG-based wind farm connected to series compensated transmission system.

Key words: hybrid unified power flow controller (HUPFC), sub-synchronous oscillation (SSO), doubly-fed wind farms, serious complement transmission, supplementary active resistance control (SARC)

CLC Number:

TM712

GAO Benfeng, WANG Xiao, LIANG Jifeng, ZHAO Shuqiang. Control Strategy of Hybrid Unified Power Flow Controller to Suppress Wind Power Sub-synchronous Oscillation[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(9): 53-64.

Figures/Tables 20

Fig.1 Structure of UPFC

Fig.2 Structure of a ST

Fig.3 Compensation voltage vector of HUPFC when the number of taps is two

Fig.4 Output power curve of a wind farm

Fig.5 Active power output of a wind farm

Fig.6 Schematic diagram of SSO generation mechanism of DFIG-based wind farm connected to series compensated transmission system

Fig.7 Equivalent circuit of DFIG-based wind farm connected to series compensated transmission system

Fig.8 Simplified equivalent circuit of DFIG-based wind farm connected to series compensated transmission system

Fig.9 The principle of HUPFC to suppress SSO

Fig.10 Overall control strategy of HUPFC with SARC

Fig.11 DFIG-based wind farm connected to series compensated transmission system with HUPFC

Table A1 Parameters of HUPFC

Table A2 Equivalent parameters of DFIG and system

Fig.12 Comparison of Bode diagrams before and after compensation

Fig.13 Equivalent impedance of the system with or without SARC under different line load

Fig.14 Active power with or without SARC under different line load

Fig.15 Line active power with or without SARC under different series compensated levels

Fig.16 System equivalent impedance with or without SARC under different capacity ratios

Fig.17 Active power with or without SARC under different capacity ratios

Fig.18 Active power with or without SARC under different fault types

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