Method for anti-islanding protection configuration of different voltage levels
A protection configuration and voltage level technology, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve the problems of maintenance personnel's life safety hazards, reverse power transmission, etc., to ensure safe and stable operation, The effect of ensuring the security of the power grid and improving the capacity of new energy consumption
Pending Publication Date: 2022-04-12
JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +4
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Problems solved by technology
Similarly, when there is a failure on the photovoltaic side and personnel are required to repair it, and the grid side is still powered, the grid side may reverse power transmission to the station, which will also bring life safety to the maintenance personnel on the photovoltaic side Hidden dangers
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[0036] A method for configuring anti-islanding protection at different voltage levels, the steps of which are as follows:
[0037] The location where the anti-islanding protection device is configured in the system is as follows: figure 1 shown.
[0038] Step 1. The total installed capacity of a 110kV photovoltaic power station is more than 20MW. Not only an inverter is required to invert the current, but a transformer is also required to step up the voltage. When configuring the anti-islanding protection device, configure underfrequency protection, overfrequency protection, low voltage protection, overvoltage protection, frequency mutation, voltage automatic closing, instantaneous reverse power discrimination tripping protection, and zero sequence voltage too high according to its system operation mode. Disconnection and low zero-sequence voltage decoupling protection function, in order to prevent inverter anti-islanding protection failure, the following measures are adopted...
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The invention relates to an anti-islanding protection configuration method with different voltage levels, which can improve the anti-islanding protection stability and effectively improve the action time of a protection device, and is characterized in that when an anti-islanding protection device of a 110kV photovoltaic power station is configured, low-frequency protection, over-frequency protection, low-voltage protection, over-voltage protection, frequency abrupt change and over-high and over-low splitting of zero-sequence voltage are configured according to a system operation mode of the 110kV photovoltaic power station; the anti-islanding protection of the 66kV photovoltaic power station is provided with current direction protection, overload protection, overvoltage protection and low-voltage protection; the anti-islanding protection device of the 35kV photovoltaic power station is provided with overvoltage protection, low-voltage protection and frequency abrupt change protection; the protection function configuration of the 10kV anti-islanding protection device comprises the functions of splitting when the voltage or the frequency is too low, splitting when the voltage or the frequency is too high, and splitting when the bus voltage is too high; the protection functions of the 380V anti-islanding protection device comprise frequency break variable protection, overload protection, overcurrent and frequency break variable protection.
Description
technical field [0001] The invention relates to the field of relay protection, in particular to a method for configuring anti-islanding protection of different voltage levels. Background technique [0002] The anti-islanding protection device is a kind of microcomputer protection device. Its function is that when the power grid has voltage drop, voltage rise, frequency drop, frequency rise, frequency mutation and other faults for some reason, the device receives The amount of faults and timely issue a trip command to trip the grid-connected point switch, making the power station off-grid. Photovoltaic anti-islanding protection device is a special protection for grid-connected access systems. It is mainly suitable for small power grid-connected power supply systems of 110KV, 66KV, 35KV, 10KV and low-voltage 380V photovoltaic power stations. Outlets. The station is quickly separated from the grid side, thereby ensuring the safety of the entire power station and related mainte...
Claims
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Login to view more IPC IPC(8): H02H7/26H02H7/22H02H3/04H02J3/38
CPCY02E10/56Y02P80/20
Inventor 刘美杰纪德贵李忠伟王顺江王洪哲佟永杰邱鹏崔嘉王彥宇王祥武占侠葛俊雄
Owner JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
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