Automatic isolation method for non-standard operation of small hydropower station
A small hydropower, non-standard technology, applied in the direction of automatic disconnection emergency protection devices, electrical components, circuit devices, etc., can solve problems such as difficult to control non-standard operation of small hydropower
Pending Publication Date: 2022-02-15
GUIZHOU POWER GRID CO LTD
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Problems solved by technology
[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that it is difficult to control the non-standard operation of small hydropower, thereby providing an automatic isolation device for non-standard operation of small hydropower
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[0025] At present, small hydropower is widely distributed in China, and the number is large. When the grid is connected to distributed energy, the grid structure of the system changes, resulting in changes in the power quality of the grid, and the power factor is out of tolerance. In order to increase revenue, some hydropower stations generate more active power. , to generate less reactive power. In order to achieve the goal, small and medium-sized hydroelectric generators for power generation consume reactive power, absorb reactive power in the power system, and compensate reactive power during generator operation, resulting in a decline in the voltage quality of the power system. , the power quality suffers too much loss.
[0026] At present, there is no research on non-power factor automatic grid disconnection devices, which leads to a major problem of whether small hydropower can generate electricity according to the standard power, resulting in low voltage operation during...
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The invention provides an automatic isolation method for non-standard operation of a small hydropower station, and the method comprises the following steps: monitoring and collecting a power factor of networking of the small hydropower station, comparing the power factor with a standard power factor, integrating a first tripping judgment condition, performing AND gate logic judgment, if all inputs are met, outputting delay out-of-tolerance protection, and executing a tripping command, otherwise, performing normal operation; monitoring and collecting the alternating current frequency sent by the small hydropower station, comparing the alternating current frequency with a set standard frequency interval, integrating a second tripping judgment condition, performing AND gate logic judgment, outputting a delay splitting function and executing a tripping command if all inputs are met, and otherwise, performing normal operation. Therefore, the problems that reactive output current of small hydropower station networking cannot be monitored in the power generation networking process of a hydropower station, a small hydropower station generator needs to consume reactive power in the power generation process, the reactive power in a power system is absorbed, reactive power compensation is carried out in the operation process of the generator, the voltage quality of the power system is reduced, and the loss of electric energy quality is too large are solved.
Description
technical field [0001] The invention relates to the technical field of power grid control, in particular to an automatic isolation method for non-standard operation of small hydropower. Background technique [0002] At present, there are quite a lot of small hydropower in China, and it is impossible to require small hydropower to be connected to the grid according to the standard power factor in the process of power generation and grid connection. Only when the electricity is copied by hand every month, is the manual calculation of whether the active power ratio meets the standard; currently there is no automatic isolation protection The device is aimed at inadvertently lowering the power factor control during the grid-connected process of small hydropower generation, or artificially reducing the power factor, which makes it difficult to control the power generation of small hydropower peak water seasons; Compensation still operates in full compensation mode, which will also...
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IPC IPC(8): H02H3/46
CPCH02H3/46
Inventor 刘修理胡崇燚黎安俊刘佳菀黎臻李毅周忠丽宋帮喜肖莉夏文郑植陈本富梁小强赵焱子刘艳孙泽林陆秋实
Owner GUIZHOU POWER GRID CO LTD