Day-ahead Economic Dispatch of Combined Electro-thermal System Based on Multi-scenario Stochastic Programming

doi:10.11985/2020.02.012

Abstract

Abstract:

The combined electro-thermal system has higher flexibility which can accommodate more wind power. Considering the uncertainty of wind power in day-ahead economic dispatch of combined electro-thermal system is a subject that needs to be studied. Wind power forecast error can be described as variable of probability following normal distribution. Sampling and scenario reduction are used to obtain stochastic scenes with certain probability. Aiming to minimize the expected value of the operating cost, considering the operating constraints of the combined electro-thermal system and the reserve constraints of thermal power units in each scenario, a day-ahead economic dispatch model of combined electro-thermal system based on multi-scenario stochastic programming is established. At last, a case of 6-node electric network and 7-node heating network is simulated to verify the effectiveness and economy of the proposed model and method.

Key words: Combined electro-thermal system, wind power accommodation, multi-scenario stochastic programming, day-ahead economic dispatch

CLC Number:

TM732

ZHANG Peng, XU Wenbao. Day-ahead Economic Dispatch of Combined Electro-thermal System Based on Multi-scenario Stochastic Programming[J]. Journal of Electrical Engineering, 2020, 15(2): 85-91.

Figures/Tables 11

References 16

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参数	数值
弃风惩罚成本系数δ/(￥/MW)	200
电锅炉的效率η^EB	0.99
水的比热容C_p/(MJ/(kg·℃))	4.182×10^-3
管道每单位长度的总传热系数λ/(W/(m·℃))	0.2
室内温度下限$T_{\min }^{\text{in}}$/℃		16
室内温度上限$T_{\max }^{\text{in}}$/℃		20
总调度时间T_c/h		24
空气热导率η_air/(kW/℃)		0.18

参数		数值
火电机组成本函数系数	b₀/￥	665
	b₁/(￥/MW·h)	27.27
	b₂/(￥/MW·h²)	0.002 22
火电机组出力下限$P_{\min }^{\text{G}}$/MW		25
火电机组出力上限$P_{\max }^{\text{G}}$/MW		55
火电机组上爬坡率P^up/(MW/min)		1
火电机组下爬坡率P^down/(MW/min)		1

参数		数值
CHP机组成本函数系数	a₀/￥	312.5
	a₁/(￥/MW·h)	30
	a₂/(￥/MW·h)	0.002 719
	a₃/(￥/MW·h²)	0.15
	a₄/(￥/MW·h²)	0.001 688
	a₅/(￥/MW·h²)	0.000 688
最大向上热功率爬坡速率Ф^up/(MW/min)		1
最大向下热功率爬坡速率Ф^down/(MW/min)		1

管道编号	L/m	D/m	m/(kg/s)
1	700	0.8	93.270 55
2	500	0.6	77.764 28
3	500	0.6	62.248 33
4	400	0.5	46.720 26
5	500	0.3	31.179 25
6	500	0.3	15.613 97

情景	运行成本/元	弃风量(%)
含电锅炉	63 431.932	0.091
不含电锅炉	66 102.234	4.325