Voltage Control Strategy of DFIG Coordinating with SVG Under Power-Limited Operation

doi:10.12204/j.issn.1000-7229.2020.10.014

Abstract

Abstract:

Due to its variable-speed constant-frequency operation characteristics, DFIG has become the current mainstream wind power generators. DFIG can generate and absorb reactive power, and support the voltage of point of common coupling (PCC). On the basis of the analysis of the equivalent circuit of DFIG, according to the relationship between the active and reactive power output from the stator side of DFIG, a coordinated voltage control strategy of DFIG under power-limited operation and SVG is proposed. Under normal condition, DFIG operates in Maximum Power Point Tracking (MPPT) mode, and SVG controls the voltage of PCC within a reasonable range. When the voltage of PCC exceeds the limit, DFIG enters the power-limited operation mode. Then DFIG and SVG coordinately control the voltage of PCC and the reactive power regulation capability of DFIG is in priority use. Finally, the effectiveness of the proposed voltage coordinated control strategy is verified by simulation.

Key words: DFIG, SVG, coordinated operation, voltage control, power-limited operation

CLC Number:

TM614

YANG Lei, LIAO Jiasi, GUO Cheng, ZHOU Xin, XIANG Chuan, HUANG Wei, XI Xinze, WANG Delin. Voltage Control Strategy of DFIG Coordinating with SVG Under Power-Limited Operation[J]. ELECTRIC POWER CONSTRUCTION, 2020, 41(10): 125-132.

Figures/Tables 13

Fig.1 P-Q characteristic curve of DFIG

Fig.2 Equivalent circuit of grid-connected SVG

Fig.3 Chart of wind farm grid-connection control

Fig.4 Structure of DFIG active power controller

Fig.5 Structure of DFIG reactive power controller

Fig.6 Structure of SVG controller

Fig.7 Principle of reactive power and voltage coordinated control

Fig.8 Simulation diagram after wind farm integration

Table 1 Parameters of the DFIG and SVG

Table 2 Three working conditions of simulation examples

Fig.9 Simulation results under 10m/s wind speed

Fig.10 Actual wind speed

Fig.11 Simulation result under actual wind speed

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