New energy power station grounding protection system, method, electronic device, and storage medium

A new energy power station grounding protection system, comprising a grounding transformer neutral-point device, a first current transformer, a potential transformer and a grounding protection apparatus;

• wherein a new energy power station comprises a plurality of lines, and the plurality of lines comprise a bus, an outgoing line and a plurality of branches;
• the branches and the outgoing line are respectively connected to the bus, the bus is provided with the potential transformer, and the outgoing line is provided with the first current transformer;
• the potential transformer and the first current transformer are respectively connected to the grounding protection apparatus;
• wherein the potential transformer is configured to detect a voltage of the bus;
• the first current transformer is configured to detect a current of the outgoing line;
• wherein the plurality of branches comprise a grounding transformer branch provided with a grounding transformer and the grounding transformer neutral-point device;
• the grounding transformer neutral-point device comprises a disconnector, a circuit breaker and a resistor which are connected in sequence;
• a high voltage side of the grounding transformer is connected to the bus, and a neutral point of the grounding transformer is grounded sequentially through the disconnector, the circuit breaker and the resistor;
• wherein the grounding protection apparatus is configured to:
• acquire the voltage of the bus and the current of the outgoing line, perform amplitude-phase comparison;
• acquire a closed/open state of the circuit breaker, and determine whether a grid side connected to the outgoing line has a ground fault to obtain a first determination result;
• generate a corresponding open/close command according to the first determination result and send the open/close command to the circuit breaker;
• wherein the circuit breaker performs a corresponding opening/closing operation according to the open/close command;
• the grounding protection apparatus comprises a processing module, and an analog input acquisition module, a binary input acquisition module and an output module which are respectively connected to the processing module;
• wherein the analog input acquisition module comprises a first interface of the analog input acquisition module and a tenth interface of the analog input acquisition module;
• the first interface of the analog input acquisition module is connected to the first current transformer;
• the tenth interface of the analog input acquisition module is connected to the potential transformer;
• the binary input acquisition module comprises a first interface of the binary input acquisition module, and the first interface of the binary input acquisition module is connected to the circuit breaker and configured to acquire the closed/open state of the circuit breaker;
• the output module comprises a fifth interface of the output module and a sixth interface of the output module, wherein the fifth interface of the output module is connected to a trip circuit of the circuit breaker and configured to output an open command, and the sixth interface of the output module is connected to a close circuit of the circuit breaker to output a close command;
• the processing module comprises a first processing circuit and a second processing circuit connected in parallel, and the output module comprises an output relay and a starting relay;
• the output relay comprises a first output relay, a second output relay, a third output relay, a fourth output relay, a fifth output relay and a sixth output relay;
• the fifth output relay is the fifth interface of the output module;
• the sixth output relay is the sixth interface of the output module;
• the first processing circuit comprises a first analog-to-digital conversion module and a first processor which are connected in sequence, and the second processing circuit comprises a second analog-to-digital conversion module and a second processor which are connected in sequence;
• the first processor is respectively connected to the first output relay, the second output relay, the third output relay, the fourth output relay, the fifth output relay and the sixth output relay;
• the second processor is connected to the starting relay;
• the starting relay controls whether a positive power supply of the output relay is applied;
• the plurality of branches further comprise a collector line and an SVG line;
• the collector line is provided with a second current transformer, and the SVG line is provided with a third current transformer;
• the grounding transformer branch is provided with a fourth current transformer arranged between the grounding transformer and the bus;
• the second current transformer, the third current transformer and the fourth current transformer are respectively configured to detect a current of the collector line, a current of the SVG line, and a current of the grounding transformer branch;
• the grounding protection apparatus performs threshold comparison on the voltage of the bus when the circuit breaker is in the open state, and if the voltage of the bus is greater than or equal to a preset threshold, the grounding protection apparatus performs calculation and amplitude-phase comparison on the voltage of the bus, the current of the outgoing line, the current of the collector line, the current of the SVG line, and the current of the grounding transformer branch to determine whether the bus has a ground fault and obtain a second determination result;
• the grounding protection apparatus performs threshold comparison on the voltage of the bus when the circuit breaker is in the open state, and if the voltage of the bus is greater than or equal to the preset threshold, the grounding protection apparatus performs calculation and amplitude-phase comparison on the voltage of the bus and the current of the collector line to determine whether the collector line has a ground fault and obtain a third determination result;
• the grounding protection apparatus performs threshold comparison on the voltage of the bus when the circuit breaker is in the open state, and if the voltage of the bus is greater than or equal to the preset threshold, the grounding protection apparatus performs calculation and amplitude-phase comparison on the voltage of the bus and the current of the SVG line to determine whether the SVG line has a ground fault and obtain a fourth determination result;
• the grounding protection apparatus performs threshold comparison on the voltage of the bus when the circuit breaker is in the open state, and if the voltage of the bus is greater than or equal to the preset threshold, the grounding protection apparatus performs calculation and amplitude-phase comparison on the voltage of the bus and the current of the grounding transformer branch to determine whether the grounding transformer branch has a ground fault and obtain a fifth determination result.