Optimization control strategy of pumped storage station in power system with high proportion wind/photovoltaic power

doi:10.19799/j.cnki.2095-4239.2021.0696

Abstract

Abstract:

The pumped storage power plant is reliable and flexible, with the ability to adapt swiftly to load changes. When the storage station was previously operational, the load distribution between units did not always take into account the differences in operation characteristics between the units, which resulted in higher energy consumption during operation. For this issue, this study considers energy balance and unit operation constraints and develops a two-layer optimization model with the optimal overall efficiency of the extraction and storage system. The top model primarily optimizes the grids storage system scheduling mode and gives power instructions to the bottom model. The lower model is mostly based on the difference in water turbine and water pump efficiency, and the loads power requirement should be evenly divided among the units to match the real power grid requirement. The results demonstrate that the proposed strategy effectively promotes the operation and economic efficiencies of the storage station.

Key words: pumped storage, double-layer optimization, peak load shifting, load distribution

CLC Number:

TM 921

Liande LIU, Jiang HE, Jiaxu ZHOU, Cuiping LI, Kaiqiang LI, Xingxu ZHU, Gangiu YAN, Junhui LI. Optimization control strategy of pumped storage station in power system with high proportion wind/photovoltaic power[J]. Energy Storage Science and Technology, 2022, 11(7): 2197-2205.

Figures/Tables 16

Fig. 1

Table 1

Table 2

Working condition coefficient of pumped storage power station"

	项目	数值
水量/电量转换系数/(m³/MWh)	抽蓄系统平均水量/电量转换系数 $C W$	778.71
	机组1水量/电量转换系数 $C w 1$	786.02
	机组2水量/电量转换系数 $C w 2$	782.62
	机组3水量/电量转换系数 $C w 3$	774.68
	机组4水量/电量转换系数 $C w 4$	771.52
水库库容/m³	上水库最大库容 $V m a x$	6.9002×10⁶
	上水库最小库容 $V m i n$	5.229×10⁵
	下水库最大库容 $V m a x$	7.0508×10⁶
	下水库最小库容 $V m i n$	7.626×10⁵

Table 2

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Table 3

Pumped-storage peak-shaving indicators under different upper-level controls"

上层控制策略	$Δ P$ /MW	$Δ P'$ /MW	$γ$ /%	D
恒功率	3983.95	2405.16	65.78	577.92
变功率	3983.95	1583.95	98.90	473.05

Table 3

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Fig. 10

Fig. 11

Fig. 12

Table 4

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运行状态转换	最多所需时间/s
静止→满载发电	120
静止→满载抽水	360
满载抽水→满载发电	360
满载发电→静止	240
满载抽水→静止	200

性能指标	均分控制	差异性控制
恒功率模式抽蓄系统平均效率/%	57.4101	57.4101
变功率模式抽蓄系统平均效率/%	71.1249	74.1326
恒功率模式抽蓄系统耗水量/m³	6.3076×10⁶	5.7577×10⁶
变功率模式抽蓄系统耗水量/m³	6.2179×10⁶	5.6615×10⁶

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