Research on Deloading Scheme and Primary Frequency Regulation Strategy of Wind Farm Considering Wind Speed Difference

doi:10.12204/j.issn.1000-7229.2022.07.016

Abstract

Abstract:

The large-scale wind power integration brings some problems such as the reduction of inertia and the shortage of primary frequency-regulation capability to the power system. Wind farms with deloading operation and frequency-regulation function could effectively deal with these problems. Therefore, a deloading scheme and the corresponding primary frequency regulation strategy of wind farm are proposed. Firstly, the principle of integrated inertia control and pitch-angle control is introduced, and the necessity of deloading operation of wind farm is analyzed. Then the difference of deloading capability of wind turbines with different wind speeds is studied and the deloading power distribution scheme of wind farm is formulated. Furthermore, according to the deloading power distribution scheme, the corresponding primary frequency regulation strategy is proposed to make full use of the frequency regulation capability of wind farm and avoid the secondary frequency drop. The simulation system model is built based on Matlab/Simulink, and the simulation results show that the deloading scheme and frequency regulation strategy could reasonably distribute the deloading power and improve the frequency regulation effect of wind farm.

Key words: deloading capability, power distribution, primary frequency regulation, integrated inertia control, pitch-angle control

CLC Number:

TM614

HE Tinyi, SUN Ling, LI Shengnan, CHEN Yiping, LI Chongtao, WANG Chenguang. Research on Deloading Scheme and Primary Frequency Regulation Strategy of Wind Farm Considering Wind Speed Difference[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(7): 139-148.

Figures/Tables 14

Fig.1 Power curve of wind turbine

Fig.2 Schematic diagram of pitch-angle control

Fig.3 Schematic diagram of deloading operation by over-speed control

Fig.4 Maximum deloading power of wind turbines with different wind speeds by over-speed control

Fig.5 Schematic diagram of deloading operation by pitch-angle control

Fig.6 Power variation curve of wind turbine

Fig.7 Control flow diagram of wind farm deloading stage and frequency regulation stage

Fig.8 Simulation system model

Table 1 Wind turbine information in the wind farm(scenario 1)

Table 2 Wind turbine deloading data in the wind farm

Fig.9 Simulation results under different control strategies in scenario 1

Table 3 Wind turbine information in the wind farm (scenario 2)

Fig.10 Simulation results under different control strategies in scenario 2

Fig.11 Simulation results under fluctuant wind speeds

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