Energy storage current device three-phase voltage independent current limiting control method
A current limiting control, three-phase voltage technology, applied in the field of power system, can solve problems such as grid voltage imbalance, equipment capacity waste, DC voltage fluctuation, etc., to improve stability, improve utilization efficiency, and overcome the effects of influence
Inactive Publication Date: 2013-12-18
BEIJING SIFANG JIBAO AUTOMATION
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However, in reality, the load in the microgrid is very likely to be unbalanced. If the three-phase control is still adopted, it will inevitably cause waste of equipment capacity, affect the economy of the grid operation, and even affect the safe and stable operation of the microgrid in severe cases; at the same time The unbalanced load in the microgrid will also cause the unbalanced grid voltage. At this time, the energy storage converter will generate negative sequence current, causing DC voltage fluctuations, which will also reduce the effective capacity of the converter and affect the operation of the grid. stability and economy
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[0025] The technical solution of the present invention will be further described in detail below according to the accompanying drawings in the description and in combination with specific cases.
[0026] figure 1 It is a structural block diagram of the control system of the present invention. The control system consists of three parts: the phase-locked loop part, the power calculation link, and the voltage calculation link. The system input is the three-phase voltage of the AC bus and the three-phase current of the device, and the output is the PWM signal. The phase-locked loop locks the angle according to the collected voltage; the power calculation link calculates the active power and reactive power according to the collected voltage, current and the output of the phase-locked loop; The pulse signal is output, and the pulse signal is sent to the drive board of the main circuit through the optical fiber, and then the control of the device is realized.
[0027] Based on the...
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The invention discloses an energy storage current device three-phase voltage independent current limiting control method. The energy storage current device three-phase voltage independent current limiting control method comprises the steps that a phase-locked ring with thee independent phases is provided, the angle of each phase is independently locked, and therefore angle difference is effectively reduced; a voltage ring with thee three independent phases is provided, the reference voltage of each phase is calculated and is independently controlled, and therefore output voltage deviation is effectively reduced; three-phase independent power calculated is carried out, and therefore different power can be output by each phase respectively. The energy storage current device three-phase voltage independent current limiting control method effectively improves the utilization ratio of an energy storage current device under unbalanced load and unbalanced voltage conditions, improves system operation economical efficiency and stability, and has good universality, practicability and application prospects.
Description
technical field [0001] The invention belongs to the power electronic control technology in the field of electric power system, and is suitable for the converter control technology of three-phase independent control. Background technique [0002] With the development of distributed energy generation technology, the capacity of distributed power generation is getting larger and larger, and the connection of a large number of distributed power sources to the grid will inevitably affect the safe and stable operation of the power grid. organization form is proposed. In recent years, micro-grid related technologies have developed rapidly, and micro-grid has become a new development direction in the field of power systems. [0003] As the energy conversion unit in the microgrid, the energy storage converter plays an important role in the microgrid. At present, most energy storage converters adopt three-phase control. The advantage of three-phase control is that the control is sim...
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IPC IPC(8): H02M1/08
Inventor 韩健张效宇赵璐璐何岩操丰梅张涛刘树刘志超陈建卫刘坤杜金陵刘智全王立超
Owner BEIJING SIFANG JIBAO AUTOMATION