Three-level wind power AVC coordinated control strategy

doi:10.3969/j.issn.2097-0706.2022.04.003

Abstract

Abstract:

In recent years, China's new energy technology has developed rapidly. Among them, power generated by grid-connected wind farms has grown rapidly. However, wind power accesses to the grid in a way of large-scale wind farm cluster, which leads to severe voltage instability and voltage over-limit at wind power grid-connected points. Automatic voltage control （AVC） system is an important technical means for reactive power voltage management, and is of great significance to the economic and stable operation of the power grid. Based on the current situation that large-scale wind power has connected to the power grid, an improved control strategy for the AVC system with wind power participation is proposed. It is a three-level wind power AVC system coordinated control strategy constructed based on a hierarchical control structure, with wind power collection stations as the intermediate co-ordination layer. The control decision is made on this layer by converting multi-unit nonlinear reactive power optimization to reactive power extreme value distribution through penalty function process. Finally, the optimal solution of reactive power is found through the proposed improved harmony search algorithm. The strategy can ensure the economic and stable operation of the power grid under the control of the AVC system.

Key words: wind power, AVC system, voltage control strategy, nonlinear reactive power optimization, simulation model, new energy

CLC Number:

TK83

CHEN Yihui, LIN Lingqi, TIAN Xin, ZHANG Dongliang, WU Jun, LIU Zichen. Three-level wind power AVC coordinated control strategy[J]. Integrated Intelligent Energy, 2022, 44(4): 20-27.

Figures/Tables 10

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Fig.3

Table 1

Table 2

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Table 3

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Fig.6

Table 4

Statistics of the value of W t at certain moments

时刻	$W t$
时刻	无策略	方式1	方式2
15:10	0.799 095 023	0.199 095 023	0.530 920 060
15:20	0.995 475 113	0.265 460 030	0.398 190 045
15:30	0.796 380 090	0.199 095 023	0.265 460 030
15:40	0.995 475 113	0.132 730 015	0.530 920 060
15:50	0.862 745 098	0.265 460 030	0.663 650 075
16:00	1.061 840 121	0.132 730 015	0.597 285 068

Table 4

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参数	数值
额定电压/V	690
定子电阻（标幺值）	0.008 4
定子漏抗（标幺值）	0.124 8
转子电阻（标幺值）	0.008 3
转子漏抗（标幺值）	0.088 4
励磁电抗（标幺值）	1.836 5
额定功率/MW	1.5
阻抗基值（标幺值）	0.563

风电场	装机容量/MW	动态无功补偿装置容量/(MV·A)
1	150.0	20
2	225.0	20
3	300.0	20
4	120.0	20
5	180.0	20

参数	数值
搜索库大小	80
搜索概率	0.7~0.9
扰动调整率	0.05
迭代次数	500