Dynamic Security Region Analysis of Power System under Different Penetration Rate of New Energy

doi:10.12204/j.issn.1000-7229.2022.04.007

Abstract

Abstract:

The large-scale grid-connection of new energy sources will bring new impact on the dynamic safety and stability of the power system, so the safe, stable and efficient utilization of new energy sources is one of the future directions of energy development. Different types of new energy sources have different effects on the transient stability of power systems, and this problem can be better solved by using the “region” analysis method. This paper proposes to construct and analyze the dynamic safety region applying the improved dynamic differential evolution-interior point method (DDE-IPM), which has the advantages of high speed, low error and high accuracy compared with the traditional method. The time-domain simulation in DIgSILENT/PowerFactory calibrates the dynamic safety region of the system under different types of new energy and different penetration rate under fault, and analyzes the low voltage ride-through capability of the system under different penetration rates, and draws the following conclusions: the dynamic safety region hyperplane of the system is parallel in nature and the boundary distance is proportional to the capacity of the new energy under each penetration rate of the system. The compensation equipment of the new energy source supports the transient safety of the system within a certain range, and the dynamic safety region of the system is expanded; both wind power and PV plants of the system have the LVRT capability of grid-connected operation.

Key words: permeability, hyperplane coefficient, time domain simulation, practical fitting, dynamic security region

CLC Number:

TM73

YANG Jinhai, WU Jiahui, WANG Haiyun, YAO Lei. Dynamic Security Region Analysis of Power System under Different Penetration Rate of New Energy[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(4): 58-68.

Figures/Tables 22

Fig.1 Dynamic security region diagram

Fig.2 Flow chart for solving hyperplane coefficients in safety region

Fig.A1 Improved IEEE 118 node test system wiring diagram

Fig.3 Active response during failure of each generator set

Table 1 Fitting hyperplane equation coefficients

Fig.4 DNEP-DSR at 5% penetration rate

Fig.5 DNEP-DSR at 50% penetration rate

Fig.B1 DNEP-DSR at 10% permeability rate

Fig.B2 DNEP-DSR at 15% permeability rate

Fig.B3 DNEP-DSR at 20% permeability rate

Fig.B4 DNEP-DSR at 25% permeability rate

Fig.B5 DNEP-DSR at 30% permeability rate

Fig.B6 DNEP-DSR at 35% permeability rate

Fig.B7 DNEP-DSR at 40% permeability rate

Fig.B8 DNEP-DSR at 45% permeability rate

Table 2 Time domain simulation results for 5% penetration rate

Table 3 Comparison of system operation indicators under different new energy penetration rate

Table 4 Comparison of the results of different methods of constructing dynamic security regions

Fig.6 Fault voltage dip curves for DFIG wind farms with different penetration rate

Fig.7 LVRT capability of DFIG wind farms with different penetration rate

Fig.8 Fault voltage dip curves for PV plants with different penetration rate

Fig.9 LVRT capability of PV plants with different penetration rate

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