Electromechanical Transient Modeling and Simulation of Multi-type Component Hybrid DC Grid

doi:10.11985/2021.03.008

Abstract

Abstract:

The hybrid DC grid composed of the line commutated converter (LCC) and the voltage source converter (VSC) is expected to become a new manifestation of the future DC network. In view of the various types of components in the hybrid DC grid, a comprehensive electromechanical transient modeling method for hybrid DC grid is proposed. First, the components in the hybrid DC power grid are analyzed, and the electro-mechanical transient model of each component is established; then the control system models of various types of converters are analyzed; finally the established electromechanical transient model is applied to the four-terminal hybrid. In the simulation of the DC grid example, the electromechanical transient and electro-magnetic transient simulation results under three working conditions are compared and analyzed, and the feasibility of the proposed hybrid DC grid electromechanical transient modeling method is verified.

Key words: Hybrid DC grid, electromechanical transient model, simulation comparison, LCC, MMC

CLC Number:

TM561

XU Panteng, ZHU Bo, YU Wenxiang, SONG Shubo, LI Jianxun, FAN Youping. Electromechanical Transient Modeling and Simulation of Multi-type Component Hybrid DC Grid[J]. Journal of Electrical Engineering, 2021, 16(3): 54-61.

Figures/Tables 21

References 21

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换流器参数	M_i(i=1, 2, 3)	L₁
交流母线电压/kV	230	230
换流变压器变比	230 kV/100 kV	230 kV/209.2 kV×2
电平数/脉动数	31	12
额定容量	200 MVA	591.8 MVA×2
直流电压/kV	±100	500
直流变压器参数	D₁
变比	200 kV/500 kV
低压侧电感/H	L=0.8
高压侧电容/μF	C=7.812 5
直流线路参数	电缆	架空线(LCC)
电阻/(Ω/km)	R=0.054 83	R=0.01
电感/(mH/km)	L=0.176	L=1.25
电容/(μF/km)	C=0.267	忽略

控制方式(有功/无功)	参考值
定直流电压控制/定无功功率M₁	U_dcref=200 kV,Q_ref=30 MVar
定交流有功/无功功率M₂	P_ref=150 MW,Q_ref=30 MVar
定交流有功/无功功率M₃	P_ref=150 MW,Q_ref=0 MVar
定支路功率控制D₁	P_dcref=400 MW
考虑关断角限值定直流电压控制L₁	U_dcref=500 kV,γ_min=15°
考虑功率边界的恒电压控制M₁	U_dcref=200 kV
适时下垂控制M₂	P_ref=150 MW,Q_ref=10 MVar
适时下垂控制M₃	U_dch=220 kV,U_dcl=180 kV
恒有功功率控制D₁	P_dcref=400 MW
考虑关断角限值的恒电压控制L₁	U_dcref=500 kV,γ_min=15°

参数	换流站潮流(功率正方向：注入)
参数	M₁			M₂		M₃		D₁		L₁
U_dc/kV	200.0			197.6		201.5		192.3		489.6
P_s/MW	115.4			150.0		150.0		400.0		-393.6
Q_s/MVar	-30.0			-30.0		0		0		311.2
参数		直流网络潮流(功率正方向：i->j)
参数		M₁M₂	M₁M₃		M₁D₁		M₂D₁		M₃D₁		D₁L₁
P_ij/MW		43.4	-36.6		108.5		192.9		113.2		400.0
P_loss/MW		0.5	0.2		4.2		5.2		5.2		6.4

系统参数	变化前	变化后
站D1直流电压/kV	192	165
站D1有功功率/MW	-400	-470
站M1直流电压/kV	200	178
站M1有功功率/MW	120	220
站M2有功功率/MW	150	210
站M3有功功率/MW	150	160

系统参数	变化前	变化后
站D1有功功率/MW	-400	-400
站M1有功功率/MW	116	140
站M2有功功率/MW	150	150
站M3有功功率/MW	150	150