A backup power automatic switching method suitable for a distributed new energy grid
It is a technology for automatic switching of backup power and distributed new energy. It is applied in emergency power supply arrangement, power network operating system integration, electrical components, etc. It can solve the problem of inrush current and impulse voltage damage to automatic devices, protection devices malfunction or refusal to operate, etc. problems, to improve reliability and safety, solve misoperation or refusal to operate, and avoid damage
Inactive Publication Date: 2019-01-04
NARI TECH CO LTD +1
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[0004] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a backup power self-switching method suitable for distributed new energy grids, so as to realize fast short-circuit current in complex multi-power supply systems and complex and changeable topological structures in the network. Cut off the fault, solve the problem of malfunction or refusal of the protection device, and avoid damage to the automatic device due to huge surge current and surge voltage
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[0020] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0021] see figure 1 , on the way, the distributed power sources A~D are put into operation on each busbar respectively. The switching logic of the conventional backup power supply is simply to cut off the distributed energy sources and switch them on automatically. The algorithm of this patent can realize the maximum retention of new energy sources for continuous operation.
[0022] see figure 2 , indicates the rotation tracking relationship between the power supply voltage and the residual voltage. When the two meet the conditions, the residual voltage switching logic can be started.
[0023] The present invention integrates fast switching, captures synchronous switching (capturing synchronous switching, meaning synchronous switching, and ensu...
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The invention discloses a standby power automatic switching method suitable for a distributed new energy grid, includes the following steps: (1) After issuing 2DL trip, rapidly detecting frequency difference and voltage phase difference between incoming voltage U<s> and bus residual voltage U<MY>; 2) after that QF2 trips, if the fast switch is not successful, the residual voltage UMY of the working bus enters an unsafe area, and the switch is not allowed at this time; When the UMY coincides with the power supply voltage US for the first time, the main contact of the 3DL is closed, that is, thecapture synchronization is switched; Backup power switching device real-time calculates voltage phase angle difference and frequency difference between U<s> and U<MY>., When U<s> is ahead U<MY> is set, if the frequency difference does not exceed the set frequency difference, a closing pulse is generated; (3) When the capture synchronization switching is not successful, switch to residual voltageswitching. In the complex multi-power supply system realized by the invention, the short-circuit current in the complex and changeable topology structure in the network can quickly remove the fault, and the huge impulse current and the impulse voltage can be avoided to damage the automatic device.
Description
technical field [0001] The invention relates to a backup power supply self-switching method suitable for distributed new energy grids, in particular to the technical field of new energy power supply. Background technique [0002] In recent years, distributed power generation technology represented by renewable resources such as solar energy and wind power has achieved rapid development, which has attracted worldwide attention. Due to its low investment and flexible features, the distributed power system has shown its advantages in today's centralized large power grid system, which has improved the safety and reliability of the system operation to a certain extent and generated huge economic benefits. benefits and social benefits. However, the access of distributed power sources will turn the original simple single power supply system into a complex multi-power supply system. The complex and changeable topology in the network will change the direction and distribution of the...
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Login to View More IPC IPC(8): H02J9/06
CPCH02J9/06Y02B70/30Y04S20/20
Inventor 沈健陈力周劭亮韩伟唐凯
Owner NARI TECH CO LTD