Protection Adaptability Analysis of Distributed Generation Connected to 10 kV Distribution Network

doi:10.12204/j.issn.1000-7229.2024.02.005

Abstract

Abstract:

Distributed generation (DG) connected to a power network has changed the traditional single-radiation power supply network structure, while the two-way power flow and load current affect the safe and stable operation of power systems. In this study, the line protection adaptability under the scenario of DG connected to a 10 kV distribution network is analyzed. Based on the different locations of distributed generation, the effects of the infeed current, outflow current, and reverse current on the existing protection of the distribution network are analyzed theoretically. The effect of the power capacity of DG on the protection performance is clarified. Moreover, the protection performance boundary conditions of a 10 kV distribution network are quantified. This study provides theoretical support for subsequent research on protection configuration schemes and new protection principles. The simulation results verify the accuracy of the protection adaptability analysis.

Key words: distributed generation (DG), 10 kV distribution network, protection adaptability, boundary conditions

CLC Number:

TM73

YUAN Zhaoxiang, ZHANG Yi, NIE Ming, LI Meng, HE Jinghan. Protection Adaptability Analysis of Distributed Generation Connected to 10 kV Distribution Network[J]. ELECTRIC POWER CONSTRUCTION, 2024, 45(2): 49-57.

Figures/Tables 17

Fig.1 Topology of the inverter

Fig.2 Two-level VSC control strategy

Fig.3 10 kV distribution network (infeed current)

Fig.4 Equivalent circuit diagram of 10 kV distribution system (infeed current)

Fig.5 10 kV distribution network (out flowing current)

Fig.6 Equivalent circuit diagram of 10 kV distribution system (out flowing current)

Fig.7 10 kV distribution network (reverse current, PV-D)

Fig.8 10 kV distribution network (reverse current, PV-B)

Fig.9 Simulation system of 10 kV distribution network

Table 1 Simulation system parameter

Table 2 Setting values of stage current protect

Fig.10 Simulation waveform of circuit breaker E1 when PV is not connected (infeed current)

Fig.11 Simulation waveform of circuit breaker E1 when PV is connected (infeed current)

Fig.12 Simulation waveform of circuit breaker E1 when PV is not connected (out flowing current)

Fig.13 Simulation waveform of circuit breaker E1 when PV is connected (out flowing current)

Fig.14 Simulation waveform of circuit breaker E3 when PV is connected

Fig.15 Simulation waveform of circuit breaker E1

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