Coordinated Optimization Model of Active Power and Reactive Power in Power and Gas Systems with the Objective of Carbon Neutrality

doi:10.16183/j.cnki.jsjtu.2021.233

Abstract

Abstract:

With the objective of carbon neutrality, renewable energy resources gradually become the main power supply, whose variability poses great challenges to the operation and optimization of the system, especially to the power distribution network. In order to solve the problem of reactive power caused by high penetration of renewable energy sources, a centralized optimization model is proposed, which takes reactive power optimization and “generation-network-load-storage” multi-energy integration into account. The model aims at optimizing the operating cost and minimizing network losses and carbon emissions of the system. Reactive power compensation, regulation of energy storage, and energy conversion are considered to achieve safe and low-carbon economic dispatch of the power and gas systems. An improved second-order cone relaxation method is used for the convex relaxation of non-linear equality constraints concerned with the distribution network. The switching capacity produced by discrete reactive power compensators can be exactly linearized by the application of the big M approach. The simulation results demonstrate that the proposed method could effectively compensate the reactive power required by the grid-connection point of wind turbine, coordinate the energy interaction between the power and gas, thus improving the stability and elasticity of the distribution network after integration of large-scale renewable energy sources, which helps promote the consumption of renewable energy.

Key words: coordinated optimization of active power and reactive power, power and gas system, carbon neutrality, renewable energy sources, improved second-order cone relaxation

CLC Number:

TM73

SUN Xin, YAN Jiajia, XIE Jingdong, SUN Bo. Coordinated Optimization Model of Active Power and Reactive Power in Power and Gas Systems with the Objective of Carbon Neutrality[J]. Journal of Shanghai Jiao Tong University, 2021, 55(12): 1554-1566.

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可调范围	SVC1出力/ Mvar	SVC2出力/ Mvar	SC出力/ Mvar	OLTC 变比
最小值	-0.2	-0.1	0	0.95
最大值	2	1	2	1.05
调节步长	连续	连续	0.5	0.01

是否计及无功补偿	电压波动水平(标准差)
计及	0.0092
未计及	0.0126

是否考虑 P2G	购电碳排放量/kg	购气碳排放量/kg	总碳排放量/kg
考虑	67239	213524	280763
不考虑	66859	217547	284406

风电渗透率	是否考虑碳排放成本	购电碳排放量/kg	购气碳排放量/kg	总碳排放量/kg
21%	考虑	93810	216427	310237
	不考虑	93990	216344	310334
32%	考虑	83119	216378	299497
	不考虑	83195	216358	299553
53%	考虑	67239	213524	280763
	不考虑	68071	213033	281104