A control method and device for low-voltage hybrid dynamic reactive power compensation
A control method and hybrid technology, applied in reactive power adjustment/elimination/compensation, circuit devices, AC network circuits, etc., can solve the problem of inability to switch on or off SVC capacitors, long compensation switching interval, and slow SVC response speed and other problems to achieve the effect of avoiding reactive power oscillation, effective dynamic response, and reducing the number of switching times
Active Publication Date: 2022-01-25
浙江南德电气制造有限公司
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Problems solved by technology
[0010] 3. Repeat 1~3 until it is impossible to put in or remove capacitors with a standard specification slightly smaller than this value in the SVC
[0013] First, the overall response speed of the device is limited by the response speed of SVC, and the response speed of SVC is slow (≤50ms)
[0014] Second, the overall switching speed of the device is limited by the switching interval of SVC, and the compensation switching interval of SVC is long (≤3min)
[0015] Third, if the dynamic change of the reactive power of the on-site load is less than a minute level, it will cause frequent switching of the SVC, and the number of switching times will increase, while the life of the SVC switching components is certain (such as the switching times of the magnetic latching relay 50,000 to 100,000 times). shorten the useful life
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[0071] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0072] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0073] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
[0074] The present invention includes a control method for low-voltage hybrid dynamic reactive power compensatio...
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The present invention provides a low-voltage hybrid dynamic reactive power compensation control method and its device. The method includes: calculating reactive power compensation power demand according to three-phase voltage, three-phase current and preset power factor threshold; calculating reactive power compensation power demand and SVG rated output power is compared, and the combination of the first compensation step and the third compensation step or the combination of the second compensation step and the third compensation step is selected according to the comparison result; for the first compensation step, SVG is used to select the reactive power compensation power requirement In the second compensation step, the SVG rated output power is selected to be compensated by the SVG compensation method; in the third compensation step, according to the first static reactive power, the second static reactive power and the third static reactive power At least one of them uses SVC for compensation, and then calculates the remaining reactive power, and uses SVG to compensate according to the remaining reactive power; reduce the switching times of SVC components and prolong their life.
Description
technical field [0001] The invention relates to the technical field of power supply and distribution, in particular to a control method and device for low-voltage hybrid dynamic reactive power compensation. Background technique [0002] The current low-voltage hybrid dynamic reactive power compensation device refers to a reactive power compensation device composed of a low-voltage SVG (static var generator) and a low-voltage SVC (static var compensator). The above-mentioned low-voltage hybrid dynamic reactive power compensation device can be combined into a hybrid device in a reactive power compensation cabinet, or a hybrid device composed of one or more SVG reactive power compensation cabinets and one or more SVC reactive power compensation cabinets ,Such as figure 1 shown. [0003] Among them, SVG is characterized by fast dynamic compensation response speed, inductive bidirectional reactive power compensation, stepless compensation, high compensation accuracy, and no cap...
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IPC IPC(8): H02J3/18
CPCH02J3/1821H02J3/1835Y02E40/10
Inventor 戴珏珺郑坚刘维城
Owner 浙江南德电气制造有限公司