Simulation Analysis of Short Circuit Current Control Strategy for 10 kV Distribution Network

doi:10.11985/2021.01.012

Abstract

Abstract:

In order to effectively control the short-circuit level of power grid, a theoretical model is established. The power system department short circuit current program (PSD-SCCP) is used to solve the fault point short-circuit impedance by using the equivalent voltage source method, and the substation is simulated. The short-circuit current level of 10 kV bus is simulated by external network equivalent method, the influence factors of short-circuit current and the current limiting effect of control measures are simulated and analyzed, the short-circuit current control measures that suitable for high load density power grid are proposed. The simulation results show that the short-circuit current level can be effectively controlled by adopting the strategy of high impedance transformer and series reactor at the low side of the transformer according to the degree of exceeding the standard when the target grid is running in different layers and zones.

Key words: Power systems operation, 10 kV distribution network, short circuit current, short circuit model, control measures, simulation calculation, external network equivalent

CLC Number:

TM727

LI Mingke, YU Liwei, CHEN Zhongping, CAI Zhaoqun. Simulation Analysis of Short Circuit Current Control Strategy for 10 kV Distribution Network[J]. Journal of Electrical Engineering, 2021, 16(1): 83-89.

Figures/Tables 12

References 26

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项目	模式①	模式②	模式③	模式④	模式⑤
本地电源接入情况	接入110/10 kV母线	接入110/10 kV母线	接入110/10 kV母线	接入110/10 kV母线	接入110/10 kV母线
110 kV母线运行方式	母线并列运行	母线分列运行	母线并列运行	母线并列运行	母线并列运行
220 kV变电站选型	普通变压器	普通变压器	高阻抗变压器	普通变压器	高阻抗变压器
110 kV变电站选型	普通变压器	普通变压器	高阻抗变压器	普通变压器	高阻抗变压器
是否串联电抗器	无安装串联电抗器	无安装串联电抗器	无安装串联电抗器	变低侧装串联电抗器	变低侧装串联电抗器

是否高阻抗	220 kV变电站							110 kV变电站
	变压器容量比	铜损/p.u.			漏抗/p.u.			变压器容量	铜损/p.u.	漏抗/p.u.
	变压器容量比	高	中	低	高	中	低	变压器容量	铜损/p.u.	U_k=16%	U_k=18%
否	150/150/75	0.001 42	0.000 71	0.001 63	0.103 52	-0.005 8	0.058 90	40	0.008 52	0.240 17	0.240 17
否	180/180/90	0.001 12	0.000 53	0.001 41	0.083 85	-0.005 3	0.053 09	50	0.007 28	0.193 60	0.193 60
否	240/240/80	0.000 62	0.000 51	0.002 12	0.060 22	-0.000 6	0.091 69	63	0.004 03	0.159 46	0.159 46
是	150/150/75	0.001 17	0.001 08	0.002 78	0.103 94	-0.005 2	0.125 83	40	0.010 86	0.365 97	0.411 72
是	180/180/90	0.000 93	0.000 67	0.002 77	0.084 43	-0.003 5	0.204 49	50	0.008 19	0.292 78	0.329 38
是	240/240/80	0.007 93	0.007 12	0.230 61	0.057 49	-0.004 7	0.139 87	63	0.005 25	0.232 36	0.261 41

额定电流/电抗百分数	220 kV变电站								110 kV变电站
额定电流/电抗百分数	4 kA-8%	4 kA-10%	4 kA-12%	3.5 kA-8%	3 kA-7%	3 kA-8%	3 kA-10%	2.5 kA-10%	3 kA-8%
现状数量/台	21	41	2	1	4	24	2	3	—
现状占比(%)	21.43	41.84	2.04	1.02	4.08	24.49	2.04	3.06	—
计算电抗标幺值/p.u.	0.115 208	0.144 010	0.172 812	0.131 667	0.134 410	0.153 611	0.192 014	0.230 416	0.153 611

	① 电源接入,无短路电流控制措施			② 母线分列运行	③ 采用高阻抗变压器		④ 采用串联电抗器			⑤ 高阻抗变压器+串联电抗器
	110/10 kV	仅110 kV	仅10 kV	② 母线分列运行	U_k=16%	U_k=18%	4 kA,10%	4 kA,8%	2.5 kA,8%	⑤ 高阻抗变压器+串联电抗器
220 kV站A	52.46	52.15	50.90	48.78	19.93	19.93	22.45	25.35	16.72	14.81
220 kV站B	82.24	81.12	76.38	71.23	25.49	25.49	26.57	30.73	18.90	15.46
220 kV站C	73.69	72.52	67.48	64.06	39.18	39.17	25.61	29.45	18.41	19.61
110 kV站D	35.92	30.69	35.37	34.61	27.13	24.90	21.92	21.92	21.92	18.69
110 kV站E	31.10	25.88	30.71	30.16	22.95	21.11	20.38	20.38	20.38	17.08
110 kV站F	26.53	21.33	26.27	25.90	19.62	18.11	18.68	18.68	18.68	15.54

变电站	现状/规划	短路电流值分布区间/kA
变电站	现状/规划	(0,20]	(20,21]	(21,22]	(22,23]	(23,24]	(24,25]	(25,∞)
220 kV变电站	现状	62	2	1	8	2	12	6
220 kV变电站	规划	28	0	0	0	0	0	0
110 kV变电站	现状	129	82	61	63	57	16	7
110 kV变电站	规划	140	0	0	0	0	0	0
主变压器数量/台		359	84	62	71	59	28	13
所占比例(%)		53.11	12.43	9.17	10.5	8.73	4.14	1.92