Overvoltage Mechanism of 66 kV Submarine Cable Transmission System for Offshore Wind Farm

doi:10.11930/j.issn.1004-9649.202208087

Abstract

Abstract:

Overvoltage level is the key parameter of the offshore wind power transmission system, which has significant impact on the system design and equipment selection. In order to evaluate the key impact factors of the overvoltage level of the offshore wind farm transmission system and calculate its overvoltage accurately, the overvoltage mechanism of offshore wind farm 66 kV submarine cable transmission system is studied in this paper. Firstly, the topology, control and protection strategy of the 66 kV offshore wind power transmission system are analyzed. And then its overvoltage mechanism is studied from the aspects of fault-free load shedding overvoltage, single phase to ground fault load shedding overvoltage and load-free overvoltage. On this basis, the influence of the neutral point grounding resistance on the overvoltage of the 66 kV transmission system is studied. Finally, a simulation model of the offshore wind power transmission system is established in the PSCAD/EMTDC environment and simulation studies are conducted. The research results show that the grounding resistance of the system and the control and protection strategy of the wind turbine are the main impact factors of the overvoltage level in the 66 kV transmission system. With the variation of the grounding resistance, the control and protection actions of the system will change. The system shows different overvoltage characteristics under different grounding resistance ranges.

Key words: offshore wind power generation, overvoltage, 66 kV submarine cable, grid fault, grounding resistance

Xiaohe WANG, Haichao YANG, Shuang SONG, Yuxin YANG, Gui YIN, Ke WANG. Overvoltage Mechanism of 66 kV Submarine Cable Transmission System for Offshore Wind Farm[J]. Electric Power, 2023, 56(11): 29-37, 48.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202208087

https://www.electricpower.com.cn/EN/Y2023/V56/I11/29

Figures/Tables 15

Fig.1 Topology of 66 kV AC submarine cable transmission system for offshore wind farm

Fig.2 Topology of PMSG

Fig.3 Control diagram of the grid-side converter in PMSG

Fig.4 Wind turbine fault voltage ride-through curve

Fig.5 Equivalent circuit diagram of 66 kV AC transmission system for offshore wind farm

Table 1 Parameters of simulation system

参数名称		数值
风电场额定功率/MW		350
交流电网电压(线有效值)/kV		220
交流电网短路比		10
升压站变压器变比		220/66
变压器阻抗(p.u.)		0.15
无功补偿设备容量/(MV·A)		35×2
发生故障的66 kV海缆长度/km		14
66 kV海缆截面/mm²		300
66 kV海缆单位长度电感/(mH·km^–1)		0.411
66 kV海缆单位长度电容/(μF·km^–1)		0.173
66 kV海缆单位长度电阻/(Ω·km^–1)		0.129

Fig.6 Simulation model of the offshore wind farm transmission system (66 kV-side neutral point ungrounded）

Table 2 Parameters of the aggregated PMSG

参数名称		数值
聚合风电机组额定功率/MW		58
风机网侧变流器交流电压/kV		0.69
风机出口变压器变比		66/0.69
风机出口变压器阻抗(p.u.)		0.13
风电机组过电压保护阈值(p.u.)		1.35
直流母线电压/kV		1.1

Fig.7 Overvoltage results under fault-free load shedding

Table 3 Overvoltage results under fault-free load shedding

位置	暂时过电压(p.u.)	操作过电压(p.u.)
66 kV母线	0.955	1.093
故障线路升压站侧	1.028	1.752
故障线路升压站侧	1.041	1.762

Fig.8 Overvoltage results under single phase to ground fault load shedding

Table 4 Overvoltage simulation results under single phase to ground fault load shedding

位置	暂时过电压(p.u.)	操作过电压(p.u.)
66 kV母线	1.740	2.544
故障线路升压站侧	1.742	2.544
故障线路升压站侧	1.748	2.541

Fig.9 Simulation model of the offshore wind farm transmission system（66 kV-side low-resistance neutral grounding method）

Fig.10 Overvoltage results under different grounding resistance values

Table 5 Overvoltage simulation results under different grounding resistance values

接地电阻/Ω	暂时过电压(p.u.)	操作过电压(p.u.)
0.1	1.157	2.311
3.0	1.338	1.764
10.0	1.677	2.149

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