Owing to climate change and environmental pollution, the proportion of fossil fuels is decreasing, and penetration of renewable energy such as PV and wind power is increasing. This affects not only the energy transaction of generation, but also the distribution system to which distributed generation...
Owing to climate change and environmental pollution, the proportion of fossil fuels is decreasing, and penetration of renewable energy such as PV and wind power is increasing. This affects not only the energy transaction of generation, but also the distribution system to which distributed generation(DG)s such as renewable energy are introduced. As DGs are introduced to the distribution system, a problem occurs in protection coordination methods in radial distribution system, which is most commonly used in the conventional distribution system. In this system detects a fault using only Over Current Relay (OCR) or Over Current Ground Relay (OCGR), which detects only over-current.
This is not suitable for a distribution system in which a DGs are introduced. Therefore, Directional Over Current Relay(DOCR) and Directional Over Current Ground Relay(DOCGR) is proposed to solve these problems, However those relay has limitation due to grounding of DG transformer. In addition, a communication-based protection coordination method is applied in loop distribution system to solve a problems of the radial distribution system. However, this also causes an protection coordination error due to the diversification of the fault current caused by DG.
Also, it is necessary to protect DG. A method is needed to continue the operation of DG, which is immediately disconnected when an temporary fault occurs. In addition, the inrush current occurred when the circuit breaker(CB) is reclosed need to be resolved to minimize a damage to power conditioning system(PCS) and system.
Therefore, this paper proposes a protection coordination methods on the grid side and DG side to solve these problems. In radial distribution system, a distance relay(DR) and DOCGR are used to detect and isolate only fault section. This algorithm prevent malfunction and non-operate of adjacent lines. In loop distribution system, this paper proposes a method of detecting all faults occurring in the line and isolating the fault section by proposing protective coordination using symmetrical components.
In the case of DG side protection coordination, this paper proposes a TFRT algorithm that maintains operation even if an temporary fault occurs on distribution system and controls the voltage during islanding operation. In addition, damage is reduced by minimizing the inrush current using inrush current control.
To verify the proposed protection coordination, radial, loop distribution system and DGs are modeled through PSCAD/EMTDC software tool. And then, by simulation it is verified that the proposed coordination operated properly.
Owing to climate change and environmental pollution, the proportion of fossil fuels is decreasing, and penetration of renewable energy such as PV and wind power is increasing. This affects not only the energy transaction of generation, but also the distribution system to which distributed generation(DG)s such as renewable energy are introduced. As DGs are introduced to the distribution system, a problem occurs in protection coordination methods in radial distribution system, which is most commonly used in the conventional distribution system. In this system detects a fault using only Over Current Relay (OCR) or Over Current Ground Relay (OCGR), which detects only over-current.
This is not suitable for a distribution system in which a DGs are introduced. Therefore, Directional Over Current Relay(DOCR) and Directional Over Current Ground Relay(DOCGR) is proposed to solve these problems, However those relay has limitation due to grounding of DG transformer. In addition, a communication-based protection coordination method is applied in loop distribution system to solve a problems of the radial distribution system. However, this also causes an protection coordination error due to the diversification of the fault current caused by DG.
Also, it is necessary to protect DG. A method is needed to continue the operation of DG, which is immediately disconnected when an temporary fault occurs. In addition, the inrush current occurred when the circuit breaker(CB) is reclosed need to be resolved to minimize a damage to power conditioning system(PCS) and system.
Therefore, this paper proposes a protection coordination methods on the grid side and DG side to solve these problems. In radial distribution system, a distance relay(DR) and DOCGR are used to detect and isolate only fault section. This algorithm prevent malfunction and non-operate of adjacent lines. In loop distribution system, this paper proposes a method of detecting all faults occurring in the line and isolating the fault section by proposing protective coordination using symmetrical components.
In the case of DG side protection coordination, this paper proposes a TFRT algorithm that maintains operation even if an temporary fault occurs on distribution system and controls the voltage during islanding operation. In addition, damage is reduced by minimizing the inrush current using inrush current control.
To verify the proposed protection coordination, radial, loop distribution system and DGs are modeled through PSCAD/EMTDC software tool. And then, by simulation it is verified that the proposed coordination operated properly.
주제어
#Distribution System, Distributed Generation, Protective Relay, Protection Coordination, Fault Ride-Through
※ AI-Helper는 부적절한 답변을 할 수 있습니다.