High Voltage Crossing Strategy of Wind Farm Considering Active and Reactive Coordinated Recovery

doi:10.12096/j.2096-4528.pgt.24216

Abstract

Abstract:

Objectives To address the serious high voltage ride-through (HVRT) problem faced by wind farms as a result of the large voltage surge at the grid-connected point after a DC fault, a recovery mechanism of “active priority balancing - reactive power dynamic compensation” considering the coordination of protection action time is proposed. Methods Based on the double closed-loop control function of doubly-fed wind turbine, the dynamic characteristics of the reactive power response speed of the rotor side converter is better than that of the grid side converter are revealed. Under the load shedding mode, a HVRT strategy of wind farm considering coordinated recovery of active and reactive power is proposed. Results By balancing active power and reactive power dynamic compensation, the dual objectives of voltage stabilization and energy balance during faults are achieved. Simulation results show that this strategy can effectively suppress the risk of transient overvoltage and improve the HVRT capability of wind farms. Conclusions The proposed strategy effectively solves the contradiction between system power imbalance and safe operation of equipment during HVRT through the active-reactive synergistic regulation mechanism, which provides a new idea for transient voltage stabilization control of power systems containing large-scale wind power.

Key words: wind power, wind power integration, DC fault, load shedding allocation strategy, high voltage ride-through (HVRT), transient overvoltage, cooperative regulation, power imbalance

CLC Number:

TK 712

Jisheng MO, Chunya YIN, Xinmin HUANG, Lu HAN, Jiangshan LIU. High Voltage Crossing Strategy of Wind Farm Considering Active and Reactive Coordinated Recovery[J]. Power Generation Technology, 2025, 46(4): 737-747.

Figures/Tables 17

Fig. 1 Equivalent circuit diagram of AC system after DC fault

Fig. 2 Converter bus voltage to unbalance power and short circuit ratio curve

Tab. 1 Group information about wind turbines at different speeds

分组	转速/pu	整定值/pu
0 1 2	>1.15	1.2
	1.1 $±$ 0.5	1.1
	1.0 $±$ 0.5	1.0
3 4 5	0.9 $±$ 0.5	0.9
	0.8 $±$ 0.5	0.8
	0.7 $±$ 0.5	0.7

Tab. 1 Group information about wind turbines at different speeds

分组	转速/pu	整定值/pu
0 1 2	>1.15	1.2
	1.1 $±$ 0.5	1.1
	1.0 $±$ 0.5	1.0
3 4 5	0.9 $±$ 0.5	0.9
	0.8 $±$ 0.5	0.8
	0.7 $±$ 0.5	0.7

Fig. 3 Improved control strategy for overspeed load shedding

Fig. 4 Control of reactive power additions to the machine-side converter

Fig. 5 Control strategies for variable DC bus voltage

Fig. 6 HVRT Control Flowchart

Fig. 7 Wind farm simulation model

Tab. 2 Parameters to wind turbine simulation

部件	参数	数值
风轮机	额定风速/(m/s)	12
风轮机	叶轮半径/m	45
发电机	额定功率/MW	2
	定子额定电压/kV	0.69
	定子电阻/pu	0.002 5
	定子漏抗/pu	0.082 4
	转子电阻/pu	0.007 6
	转子漏抗/pu	0.098 5
	励磁电抗/pu	2.759 8
	基准功率/MW	10
	基准电压/V	690

Tab. 3 Speed distribution and operating conditions of wind turbines during mild voltage surge

风机所处转速/pu	风机台数	单台最大功率/MW	单台风机减载功率/MW	减载后转速/pu
0.7 $±$ 0.5	5	1.42	0.37	1.12
0.8 $±$ 0.5	5	1.68	0.30	1.12
0.9 $±$ 0.5	5	1.91	0.22	1.12
1.0 $±$ 0.5	3	2.00	0.15	1.12
1.1 $±$ 0.5	1	1.95	0.08	1.12
>1.15	1	1.78	0

Tab. 3 Speed distribution and operating conditions of wind turbines during mild voltage surge

风机所处转速/pu	风机台数	单台最大功率/MW	单台风机减载功率/MW	减载后转速/pu
0.7 $±$ 0.5	5	1.42	0.37	1.12
0.8 $±$ 0.5	5	1.68	0.30	1.12
0.9 $±$ 0.5	5	1.91	0.22	1.12
1.0 $±$ 0.5	3	2.00	0.15	1.12
1.1 $±$ 0.5	1	1.95	0.08	1.12
>1.15	1	1.78	0

Fig. 8 Curve of active power change of wind farm during small load change

Fig. 9 Simulation diagram of integrated control strategy during mild grid voltage surge

Tab. 4 Changes in turbine reactive power under different control strategies

类型	参数	传统控制策略/pu	本文控制策略/pu
机侧变流器	无功功率极限值	0.30	0.7
机侧变流器	无功功率实际值	0.30	0.6
网侧变流器	无功功率极限值	0.15	0.5
网侧变流器	无功功率实际值	0.15	0.3

Tab. 5 Speed distribution and operation of wind turbines during heavy voltage surge

风机所处转速/pu	风机台数	单台最大功率/MW	单台最大减载功率/MW	单台风机减载功率/MW	减载后转速/pu	转速整定值/pu
0.7 $±$ 0.5	5	1.42	0.46	0.75	1.3	1.2
0.8 $±$ 0.5	5	1.68	0.40	0.59		1.2
0.9 $±$ 0.5	5	1.91	0.32	0.45		1.2
1.0 $±$ 0.5	3	2.00	0.25	0.30		1.2
1.1 $±$ 0.5	1	1.95	0.12	0.15		1.2
>1.15	1	1.78	0	0		1.2

Tab. 5 Speed distribution and operation of wind turbines during heavy voltage surge

风机所处转速/pu	风机台数	单台最大功率/MW	单台最大减载功率/MW	单台风机减载功率/MW	减载后转速/pu	转速整定值/pu
0.7 $±$ 0.5	5	1.42	0.46	0.75	1.3	1.2
0.8 $±$ 0.5	5	1.68	0.40	0.59		1.2
0.9 $±$ 0.5	5	1.91	0.32	0.45		1.2
1.0 $±$ 0.5	3	2.00	0.25	0.30		1.2
1.1 $±$ 0.5	1	1.95	0.12	0.15		1.2
>1.15	1	1.78	0	0		1.2

Fig. 10 Curve of active power change of wind farm during large load change

Fig. 11 System frequency variation curve

Fig. 12 Simulation diagram of integrated control strategy during grid voltage redundancy surge

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