Technical Requirements For Photovoltaic Power Plants
Author: Source: Datetime: 2016-09-30 11:37:35
The second part of the access system is designed according to the current system, including system relay protection and safety automatic device, system dispatching automation and system communication. When the short circuit fault occurs in the line of the PV power plant, the line protection can move quickly and break the circuit breaker instantly to meet the requirement of fast and reliable fault removal. 10kV line in the line side of the line set to configure a set of over-current protection or distance protection, photovoltaic power plant side may not be equipped with line protection, by the solar power generation system side of the line fault removal. For 2 or more step-up transformer substation or collection station, 10kV line can be configured with a set of longitudinal current differential protection, the direction of over-current protection as its backup protection.
The protection of the circuit in the no-load, light load, full load and other conditions, the occurrence of metallic and non-metallic of the various failures, the line protection should be able to correct action. Protection against malfunctions, external faults, fault transitions, and system operation should not be mishandled. In the event of oscillation of the line should not be protected when the action, the oscillation process failure, should ensure reliable fault removal. Main protection The whole group action time is not more than 20ms (not including the channel transmission time), the return time is not more than 30ms (from the fault removal to the protection of outlet contacts return). Manual closing or coincidence in the fault line, the protection should be able to reliably instantaneous three-phase jump brake. Manual closing or coincidence in the fault-free line should not be reliable action. Protection device should have a good filtering function, with anti-interference and anti-harmonic capacity. In the system switching transformers, static compensation devices, capacitors and other equipment, the protection should not malfunction.
10kV busbar for the installation of photovoltaic power plants, 10kV bus protection configuration should be considered with the 10kV line protection. When the system side configuration line over-current or distance protection, the PV plant side may not configure the bus protection, only by the substation side line protection fault removal; when the lines on both sides of the line longitudinal differential protection, the solar power station side should configure a Bus protection; in the photovoltaic power plant time limit allows, but also rely on the back-line protection fault removal. The busbar protection shall not be affected by the transient saturation of the current transformer and shall operate incorrectly and shall allow the use of current transformers of different ratios. The busbar protection shall not be rejected due to the short-circuit current flowing out of the busbar during the bus fault. In the photovoltaic power plant side of the security device automatically, to achieve frequency voltage abnormal emergency control work can, jump off the photovoltaic power plant side circuit breaker. If the PV power plant side 10kV line protection has the function of voltage loss tripping and checking the voltage lockout closing function, it is possible to realize the deserialization according to Un (20% Un, 0.5 second), or independent safety Automatic device.
It is necessary to check whether the relevant line protection of the system-side substation meets the PV power station access requirements. If you can meet the requirements of access, to be explained. If it can not meet the requirements of the PV power plant access plan, the solar powered portable generator system side of the substation need to do the relevant line protection configuration program. It is necessary to check whether the bus protection of the system-side substation meets the requirements of the access scheme. If you can meet the requirements of access, to be explained. If it can not meet the requirements of the PV power plant access plan, the system side of the substation need to configure the bus protection.
It is necessary to verify the plan of the side-by-side self-inputting of the substation and the reclosing scheme of the related lines, and propose an adjustment scheme according to the anti-islanding detection scheme. After the PV power station is connected to the substation, the standby operation time must be kept away from the detection time of the PV power station.
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