Island detection and control method of distributed energy resource of safety automatic control system
An automatic control system and distributed energy technology, applied in the electric power field, can solve the problems of adding disturbance to the system and complicated wiring, so as to ensure the island detection rate, simple wiring method, and solve the island problem.
Active Publication Date: 2015-05-13
CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER +2
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Problems solved by technology
The traditional interlock trip island protection wiring is complex and requires a large number of control cables to be connected
Island protection based on local measurement includes passive and active island protection. Passive island protection has detection blind spots, while active island protection needs to add disturbance signals to the system and can only be installed on the distributed power supply side.
Method used
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[0017] The island detection and control method of the distributed energy source of the safety automatic control system of this embodiment includes the following steps:
[0018] The control terminal installed on the distributed power supply side measures the frequency of the distributed power supply synchronously, and marks the frequency, and sends the synchronous measurement frequency data to the public power grid side through the 3G network;
[0019] The control terminal installed on the public grid side measures the frequency of the public grid synchronously, and marks it with a time stamp, and at the same time receives the synchronous measurement frequency data sent from the distributed power supply side;
[0020] The control terminal installed on the public grid side calculates the frequency difference between the public grid side and the distributed power supply side according to the time scale. If the frequency difference exceeds a set action value (the set action value i...
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The present invention relates to a method for detecting an island of a distributed energy source of a safety automatic control system, including: a control terminal mounted at a distributed power supply side performing synchronous frequency measurement on a distributed power supply, making a time mark, and sending the synchronous frequency measurement data to a utility grid side via a 3G network; a control terminal mounted at the utility grid side performing synchronous frequency measurement on a utility grid, and making a time mark, while receiving the synchronous frequency measurement data sent from the distributed power supply side; the control terminal mounted at the utility grid side calculating a frequency difference of the utility grid side and the distributed power supply side according to the time marks, and if the frequency difference exceeds a set operating value, sending a trip command to the distributed power supply side after a specified time delay; if the frequency difference exceeds a set start value but does not exceed the set operating value, calculating a frequency difference energy integral value Kdf; and if the Kdf exceeds a frequency difference energy integral set value, sending a trip command to the distributed power supply side.
Description
technical field [0001] The invention relates to the field of electric power technology, in particular to an island detection and control method for a distributed energy source of a security automatic control system based on a 3G network. Background technique [0002] The so-called isolated island phenomenon refers to that in the distributed power generation system, when the grid power supply trips due to a fault accident or power outage maintenance, the distributed grid-connected power generation system at each user end fails to detect the power outage state in time and cuts itself off from the mains network. Finally, a self-sufficient power supply island power generation system composed of a distributed power station grid-connected power generation system and its connected loads is formed. The occurrence of the island effect will bring serious safety hazards to the system equipment and related personnel, including: (1) The island effect will cause the voltage and frequency ...
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IPC IPC(8): H02J3/38
CPCH02J3/38H02J3/388
Inventor 曹良何晓明罗皎虹奚汉江王强强
Owner CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER