Collaborative Expansion Planning of Source-Grid-Storage in Medium Voltage Distribution System Considering Operational Flexibility

doi:10.11930/j.issn.1004-9649.202312058

Abstract

Abstract:

To adapt to the dual volatility of distributed generation (DG) and load in the new distribution system, it is necessary to coordinate the source-grid-storage allocation to meet the needs of system operational flexibility. To characterize the operational flexibility level of the distribution system, three indexes including the net load adaptability index, net load fluctuation index and line load margin balance index are proposed from three aspects including flexible supply and demand balance, net load curve smoothness and line transmission balance, and a distribution system source-grid-storage three-layer expansion planning model is established with consideration of above indexes. The upper and middle layers are optimized in distribution lines, DG and energy storage to minimize the annual comprehensive costs, and the lower layer is optimized in operation to maximize the operational flexibility. The composite clustering algorithm is used to generate the typical planning scenarios of the distribution system, and the three-layer extended planning model is solved with the improved particle swarm algorithm and non-dominated genetic algorithm in the bi-level nested form. Finally, the effectiveness and superiority of the proposed planning model are verified based on the improved IEEE33 node system.

Key words: distribution system expansion planning, operational flexibility, distributed generation, energy storage system, source-grid-storage coordination planning

Fengliang XU, Keqian WANG, Wenhao WANG, Peng WANG, Huanchang WANG, Shuai Zhang, Fengzhan ZHAO. Collaborative Expansion Planning of Source-Grid-Storage in Medium Voltage Distribution System Considering Operational Flexibility[J]. Electric Power, 2024, 57(7): 98-108.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202312058

https://www.electricpower.com.cn/EN/Y2024/V57/I7/98

Figures/Tables 13

References 27

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单位线路长度成本/ （万元·km^–1）	新建线路使用年限/年	维护成本系数
单位线路长度成本/ （万元·km^–1）	新建线路使用年限/年	新建线路	DG
15	20	0.03	0.03

投资成本/(元·kW^–1)		使用年限/年
分布式光伏	分布式风机	分布式光伏	分布式风机
4000	5000	20	15

ESS成本			ESS使用年限/年
容量投资/ (元·(kW·h)^–1)	功率投资/ (元·kW^–1)	运行/ (元·(kW·h)^–1)	ESS使用年限/年
1000	500	0.08	20

ESS荷电状态			ESS充放电效率/%
初始值	最大值	最小值	ESS充放电效率/%
0.5	0.9	0.1	95

电价/(元·(kW·h)^–1)			单位网损成本/ (元·(kW·h)^–1)	贴现率
峰时	平时	谷时
10:00—14:00， 17:00—21:00	07:00—10:00， 14:00—17:00， 21:00—23:00	23:00至次日07:00
1.64	1	0.41	0.4	0.1

单位线路长度成本/ （万元·km^–1）	新建线路使用年限/年	维护成本系数
单位线路长度成本/ （万元·km^–1）	新建线路使用年限/年	新建线路	DG
15	20	0.03	0.03

投资成本/(元·kW^–1)		使用年限/年
分布式光伏	分布式风机	分布式光伏	分布式风机
4000	5000	20	15

ESS成本			ESS使用年限/年
容量投资/ (元·(kW·h)^–1)	功率投资/ (元·kW^–1)	运行/ (元·(kW·h)^–1)	ESS使用年限/年
1000	500	0.08	20

ESS荷电状态			ESS充放电效率/%
初始值	最大值	最小值	ESS充放电效率/%
0.5	0.9	0.1	95

电价/(元·(kW·h)^–1)			单位网损成本/ (元·(kW·h)^–1)	贴现率
峰时	平时	谷时
10:00—14:00， 17:00—21:00	07:00—10:00， 14:00—17:00， 21:00—23:00	23:00至次日07:00
1.64	1	0.41	0.4	0.1

方案	线路建设编号	DG规划节点号（容量/kW)	ESS规划节点号（功率/kW,容量/(kW·h)）
1）	33, 34, 43, 36, 37, 38, 39, 40, 42, 45	3(600),17(500), 27(800),41(900)	—
2）	33, 34, 35, 37, 38, 39, 40, 42, 45, 46	10(800),16(700), 21(800),32(1000)	—
3）	33, 35, 43, 37, 44, 38, 39, 40, 42, 45	2(700),15(700), 32(900),33(800)	2(100,700),9(200,800), 19(100,800),24(200,900), 37(300,1200)
4）	33, 34, 35, 36, 37, 38, 39, 40, 41, 45	12(900),17(900), 32(700),40(800)	8(400,800),17(300,900), 32(200,800),34(300,9000),41(400,1200)
5）	33, 34, 43, 46, 37, 38, 39, 40, 42, 45	8(1000),17(800),18(700),39(1000)	6(200,800),15(200,800), 19(100,600),34(200,1000),35(400,1200)

方案	线路建设编号	DG规划节点号（容量/kW)	ESS规划节点号（功率/kW,容量/(kW·h)）
1）	33, 34, 43, 36, 37, 38, 39, 40, 42, 45	3(600),17(500), 27(800),41(900)	—
2）	33, 34, 35, 37, 38, 39, 40, 42, 45, 46	10(800),16(700), 21(800),32(1000)	—
3）	33, 35, 43, 37, 44, 38, 39, 40, 42, 45	2(700),15(700), 32(900),33(800)	2(100,700),9(200,800), 19(100,800),24(200,900), 37(300,1200)
4）	33, 34, 35, 36, 37, 38, 39, 40, 41, 45	12(900),17(900), 32(700),40(800)	8(400,800),17(300,900), 32(200,800),34(300,9000),41(400,1200)
5）	33, 34, 43, 46, 37, 38, 39, 40, 42, 45	8(1000),17(800),18(700),39(1000)	6(200,800),15(200,800), 19(100,600),34(200,1000),35(400,1200)

方案	等年值投资成本			年维护成本		年网损成本	上级电网年购电成本	总成本
方案	线路	DG	ESS	新建线路	设备	年网损成本	上级电网年购电成本	总成本
1）	44.4	163.4	—	1.3	4.9	28.7	1293.9	1536.6
2）	46.7	188.8	—	1.4	5.7	24.0	1233.7	1500.3
3）	45.4	177.5	57.0	1.4	10.8	25.9	1082.7	1400.2
4）	43.0	183.2	63.4	1.3	10.9	24.7	1042.1	1367.3
5）	48.1	196.3	58.1	1.4	11.6	22.8	1012.4	1300.5