Low-voltage hybrid dynamic reactive compensation control method and device
A control method and a hybrid technology, applied in reactive power adjustment/elimination/compensation, circuit devices, AC network circuits, etc., can solve the problems of inability to switch on or off SVC capacitors, long intervals between compensation switching and slow response of SVC and other issues, to achieve the effect of avoiding reactive power oscillation, effective dynamic response, and reducing the number of switching times
Active Publication Date: 2021-09-07
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 invention provides a low-voltage hybrid dynamic reactive compensation control method and device. The method comprises the following steps of: calculating a reactive compensation power demand according to a three-phase voltage, a three-phase current and a preset power factor threshold; and comparing the reactive compensation power demand with the rated output power of a SVG, and selecting the combination of a first compensation step and a third compensation step or the combination of a second compensation step and the third compensation step according to the comparison result; executing the first compensation step: selecting the reactive compensation power demand and performing compensation by adopting an SVG compensation mode; executing the second compensation step: selecting the rated output power of the SVG and performing compensation by adopting an SVG compensation mode; and executing the third compensation step: performing compensation by adopting an SVC according to at least one of first static reactive power, second static reactive power and third static reactive power, then performing calculation to obtain residual reactive power, and performing compensation by adopting the SVG according to the residual reactive power. The switching frequency of SVC parts is reduced, and the service life is prolonged.
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