Control method for reactive power compensation system
A compensation system and control method technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, AC network circuits, etc. The effect of low operating frequency
Inactive Publication Date: 2018-11-02
苏州中康电力开发有限公司
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Problems solved by technology
When multiple reactive power compensation devices are used for mixed compensation, there is a problem of how to coordinate the operation of each reactive power compensation device, for example, how to prevent the reactive power compensation device from overcompensating, and if one or several of them are always used One reactive power compensation device, while other reactive power compensation devices are idle, which will inevitably reduce the service life of the system
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[0011] like figure 1 , figure 2 As shown, a control method for a reactive power compensation system, the reactive power compensation system includes an AC power supply, a load, and a reactive power compensation system, the load is connected to the output end of the AC power supply, the reactive power compensation system and the reactive power compensation system The loads are connected in parallel, and the reactive power compensation system includes a control unit, a first reactive power compensation device to an Nth reactive power compensation device, where N is a natural number greater than or equal to 1; it also includes a controllable inverter rectifier, a controllable reversible rectifier The variable rectifier stores the required energy on M supercapacitors from the high-voltage level grid, where M is a natural number greater than or equal to 1. The storage capacity is W, and the controllable and invertable rectifier is connected to the controller. The control unit of t...
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The invention discloses a control method for a reactive power compensation system. A parallel type reactive power compensation system comprises an alternating current power supply, a load and the reactive power compensation system, wherein the load is connected to the output end of the alternating current power supply; the reactive power compensation system is connected in parallel with the load and comprises a control unit and multiple reactive power compensation devices. The control method of the control unit comprises the following steps: Step I, calculating the sum F of the rated compensation capacities of the reactive power compensation devices from one to n; and Step II, judging a relation between the sum F of the rated compensation capacities of the reactive power compensation devices from one to n and the storage capacity W, and if F is greater than or equal to W, providing the rated compensation capacity through the reactive power compensation devices from one to n-1, and providing the residual reactive power compensation capacity through the nth reactive power compensation device, otherwise, adding one more supercapacitor, and jumping to Step I. The control method has theadvantages of lowering the switching loss, reducing electromagnetic interference and the like.
Description
technical field [0001] The invention relates to the technical field of reactive power compensation, in particular to a large-capacity parallel reactive power compensation system and a control method thereof. Background technique [0002] In the power system, in order to avoid power loss caused by the electrical devices supplying a large amount of reactive current to the distribution network, each power receiving point (such as low-voltage transformers and the installation of large electrical equipment) needs to be equipped with reactive power of corresponding voltage levels. compensation device. Limited by the high cost of large-capacity power switching devices, multiple reactive power compensation devices are often connected in parallel in the known technology to perform hybrid compensation. When using multiple reactive power compensation devices for mixed compensation, there is a problem of how to coordinately operate each reactive power compensation device. One reactive...
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IPC IPC(8): H02J3/18
CPCH02J3/1842Y02E40/30
Inventor 卓钢冯晖张国民
Owner 苏州中康电力开发有限公司