An Analytical Calculation Method for Total Transfer Capability of Transmission Section Based on Evaluation of System Short Circuit Capability

doi:10.11930/j.issn.1004-9649.202402004

Abstract

Abstract:

In the HVDC sending-end system, the system's short-circuit capacity is mainly provided by conventional generating units. When the operating mode of conventional generating units changes and the short-circuit capacity changes, it will have a significant impact on the system's safety and stability characteristics. The existing section total transfer capability calculation methods often ignore the key variable of short-circuit capacity when verifying the system's safety and stability, which may lead to calculation errors. Therefore, this paper proposes a section total transfer capability analytical calculation method based on short-circuit capacity evaluation. Firstly, the system security and stability constraints considering the short-circuit capacity are constructed. Then, the contribution index of conventional generating units to the system's short-circuit capacity is proposed, and a section total transfer capability analytical calculation method is proposed based on this index. Finally, taking a certain power grid in Northwest China as an example, the effectiveness of this method is verified through case analysis in the power system analysis and simulation program.

Key words: transmission section, short-circuit capacity, start-up mode, total transfer capability, power-angle stability, transient overvoltage

Yao LIU, Ziheng LI, Zixuan ZHENG, Donghui SONG, Xiaoteng LI, Ding ZHANG, Jie REN, Qi XIE. An Analytical Calculation Method for Total Transfer Capability of Transmission Section Based on Evaluation of System Short Circuit Capability[J]. Electric Power, 2025, 58(3): 98-107.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202402004

https://www.electricpower.com.cn/EN/Y2025/V58/I3/98

Figures/Tables 11

References 26

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电厂	容量 (p.u.)	暂态电抗 $ {X'_{\text{d}}} $(p.u.)	短路暂态时间常数T_j(p.u.)	直轴电抗 X_d(p.u.)
QSC电厂	4×10	0.246	7.760	1.934
DT电厂	2×6.6	0.334	6.712	2.496
SH电厂	2×6.6	0.300	7.140	2.080
XF电厂	1×6.6	0.297	6.940	2.059
QY电厂	2×3.5	0.265	6.240	2.171
HL电厂	1×6.6	0.200	9.620	1.800
XYJN电厂	2×3	0.223	5.560	1.800
GJW电厂	2×3	0.202	6.990	1.800
SQC电厂	2×3	0.229	5.260	1.800
XWZ电厂	2×6	0.297	6.940	2.059
YHP电厂	2×6	0.334	6.900	2.496
FXDC电厂	2×10	0.246	7.760	1.934
DTDC电厂	2×6	0.286	6.090	1.985

电厂	容量 (p.u.)	暂态电抗 $ {X'_{\text{d}}} $(p.u.)	短路暂态时间常数T_j(p.u.)	直轴电抗 X_d(p.u.)
QSC电厂	4×10	0.246	7.760	1.934
DT电厂	2×6.6	0.334	6.712	2.496
SH电厂	2×6.6	0.300	7.140	2.080
XF电厂	1×6.6	0.297	6.940	2.059
QY电厂	2×3.5	0.265	6.240	2.171
HL电厂	1×6.6	0.200	9.620	1.800
XYJN电厂	2×3	0.223	5.560	1.800
GJW电厂	2×3	0.202	6.990	1.800
SQC电厂	2×3	0.229	5.260	1.800
XWZ电厂	2×6	0.297	6.940	2.059
YHP电厂	2×6	0.334	6.900	2.496
FXDC电厂	2×10	0.246	7.760	1.934
DTDC电厂	2×6	0.286	6.090	1.985

电厂	提供短路容量 (p.u.)	电厂	提供短路容量 (p.u.)
QSC电厂	23.43	FXDC电厂	3.94
XWZ电厂	17.44	GJW电厂	3.35
YHP电厂	15.69	QY电厂	3.24
XF电厂	13.99	DTDC电厂	3.08
DT电厂	12.45	XYJN电厂	2.85
HL电厂	7.83	SQC电厂	2.84
SH电厂	7.47

电厂	提供短路容量 (p.u.)	电厂	提供短路容量 (p.u.)
QSC电厂	23.43	FXDC电厂	3.94
XWZ电厂	17.44	GJW电厂	3.35
YHP电厂	15.69	QY电厂	3.24
XF电厂	13.99	DTDC电厂	3.08
DT电厂	12.45	XYJN电厂	2.85
HL电厂	7.83	SQC电厂	2.84
SH电厂	7.47

电厂	开机方式1	开机方式2	开机方式3	开机方式4
QSC电厂	4	3	3	4
DT电厂	1	2	2	2
XWZ电厂	2	2	2	2
XF电厂	1	1	1	1
GJW电厂	1	1	2	2
SQC电厂	1	1	2	2
YHP电厂	2	2	2	2
SH电厂	1	1	1	1
XYJN电厂	1	1	1	1
HL电厂	1	1	1	1
QY电厂	2	2	2	2
FXDC电厂	2	2	2	2
DTDC电厂	2	2	2	2