Stability Analysis of LCC-HVDC with PV Station at the Receiving End

doi:10.11930/j.issn.1004-9649.202305006

Abstract

Abstract:

A new type of receiving-end power system with high proportion of new energy and HVDC has been formed in Hubei. In the scenario where the PV station is located near the HVDC receiving-end converter station, the sub-synchronous oscillation characteristics of power electronic devices and the interactions between the sub-systems are still to be analyzed. This paper used eigenvalue analysis method to explore the influence of the massive infeed of PV stations. Firstly, with a small signal analysis model of HVDC with PV station established, this paper has confirmed that the infeed of PV stations has a significant influence on the system stability. The interaction characteristics between subsystems were further observed through the dominant mode, and the feasible region of photovoltaic control parameters set, with a view to lower risks of sub-synchronous oscillation in the system. Finally, this paper defined the subsystem participation degree and measured the influence of operational parameters on the sub-synchronous interaction between the systems. It is concluded that the interaction between the PV plant and the DC system is stronger in the case of low grid strength and high light intensity at the receiving end. When designing a PV plant for grid connection, a conductor with a small impedance ratio should be selected to reduce the distance of the PV grid connection line. This conclusion can provide a theoretical basis for photovoltaic grid-connected design.

Key words: LCC-HVDC, PV station, sub-synchronous oscillation, interaction, eigenvalue analysis

Yuqing ZHOU, Dahu LI, Wei YAO, Qihang ZONG, Hongyu ZHOU, Jinyu WEN. Stability Analysis of LCC-HVDC with PV Station at the Receiving End[J]. Electric Power, 2024, 57(3): 170-182.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202305006

https://www.electricpower.com.cn/EN/Y2024/V57/I3/170

Figures/Tables 27

Fig.1 Structure of LCC-HVDC receiving end system with PV feed

Table 1 Parameters of LCC-HVDC system

类型	参数	数值
直流系统	额定电压/kV	500
直流系统	额定功率/MW	1000
换流站	K_r∶1	345 kV/213 kV
	1∶K_i	209 kV/230 kV
	K_p1	30
	K_i1	1200
	K_p2	50
	K_i2	1000
直流线路	L_dc/H	0.5968
直流线路	R_dc/Ω	2.5
交流系统	送端等效电阻/Ω	4.778
	送端等效电抗/H	0.1509
	受端等效电阻/Ω	8.24
	受端等效电抗/H	0.0851

Fig.2 Control structure of GIGRE first standard testing system

Fig.3 Control structure of grid-connected PV station

Table 2 Parameters of PV station system

类型	参数	数值
光伏电池阵列	标准温度/℃	25
	标况短路电流/A	9.16
	标况开路电压/V	36
	最大功率电流/A	8.45
	最大功率电压/V	29.62
	并联个数N_p	6700
	串联个数N_s	300
DC-DC变换器	续流电感L/mH	0.075
DC-DC变换器	光伏出口电容/μF	1000
VSC	K_pdc	10
	K_idc	50
	K_pd	2
	K_id	20
	K_pq	50
	K_iq	1
交流并网线路	L/H	0.04
锁相环	K_ppll	30
锁相环	K_ipll	500
电站	额定功率 P/MW	500

Fig.4 Equivalent input and output variable diagram

Fig.5 Response comparison of small signal and electromagnetic transient modals

Fig.6 Response waveform of DC system to interference before and after PV infeed and its spectrum analysis

Fig.7 Output active power of DC inverter

Table 3 Dominant modals of LCC-HVDC system

模态	名称	特征根	频率/Hz
1、2	交流模态	–28.29 ± j120.01×2π	120.01
3、4	交/直流模态	–37.76 ± j28.11×2π	28.11
5、6	直流模态	–37.27 ± j10.17×2π	10.17

Table 4 Dominant modals of LCC-HVDC system with PV infeed

模态	名称	特征根	频率/Hz
1、2	交流模态	–51.08 ± j115.8×2π	115.80
3、4	交/直流模态	–57.14 ± j27.75×2π	27.75
5、6	直流模态	–34.01 ± j5.80×2π	5.80
7、8	光伏/交流/直流交互模态（交互振荡模态）	–9.12 ± j5.40×2π	5.40

Fig.8 Dominant modal participation factor analysis diagram

Fig.9 Root locus when Kpll increases in (1, 70)

Fig.10 Response of DC active power Pdc under different Kpll

Fig.11 Root locus when KP1 increases in (1, 50)

Fig.12 Response of DC active power Pdc under different KP1

Fig.13 Root locus when KP2 increases in (1, 50)

Fig.14 Response of DC active power Pdc under different KP2

Fig.15 Participation degree changes with SCR changes

Fig.16 Influence of receiving-end SCR on interaction oscillation modal

Fig.17 Participation degree changes with irradiance changes

Fig.18 Influence of irradiance on interaction oscillation modal

Fig.19 Participation degree changes with receiving-end impedance ratio changes

Fig.20 Influence of receiving-end impedance ratio on interaction oscillation modal

Fig.21 Participation degree changes with changes in distance of AC grid-connected line

Fig.22 Effect of line distance on Interaction oscillation mode

Fig.23 Response of DC active power Pdc under different distances of AC grid-connected line

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