A control method and control device for a micro power supply
A control method and control device technology, applied in the direction of circuit devices, electrical components, AC network circuits, etc., can solve problems such as system crashes, high power supply dependence, and inability to operate stably, and achieve the effect of reducing frequency jitter
Inactive Publication Date: 2016-04-27
XJ ELECTRIC +1
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Problems solved by technology
When peer-to-peer control is adopted, the voltage amplitude and frequency of the system will change accordingly with the change of load demand. The reason is that the Droop control mode belongs to differential regulation. It may exceed the specified allowable deviation range, and the system cannot run stably; when using master-slave control based on a single V / f power supply, although the voltage amplitude and frequency of the system can be maintained within the adjustable capacity range of the V / f power supply , but the system relies heavily on the power supply. Once a large amount of power exchange is required in the system, exceeding its adjustable capacity range, or the power supply fails, the stable operation of the system cannot be maintained, and even the entire system collapses.
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[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0023] Take two micro-power sources as an example (this method is of course also applicable to more micro-power sources), micro-power sources DG1 and DG2 are connected to the busbar of the micro-grid, and DG1 and DG2 are equipped with corresponding parallel and off-grid controllers with power regulation capabilities . Such as figure 1 The schematic diagram of the basic composition of the control system is shown. The control system of the micro power supply includes a grid-connected converter, a converter control module, a power calculation module, a phase-locked loop module, and a voltage and current detection module.
[0024] The voltage and current detection module is mainly used to detect the voltage and current variables of the current system; the phase-locked loop module is mainly used to detect the real-time frequency of the system to control the frequ...
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The invention relates to a control method and device of micro power supplies. When the fact that a micro power grid is in isolated island operation is judged, at least one micro power supply is selected to be used as a main control power supply for stabilizing system frequency. The micro power supply which is used as the main control power supply is in a V / f control mode, and other micro power supplies with a power adjusting function are in a Droop control mode. A method for selecting is that system frequency and set frequency threshold values of the micro power supplies are compared, and the micro power supply with the system frequency reaching the set frequency threshold value is converted from the Droop control mode to the V / f control mode. The micro power supply is used as the main control power supply for providing stable voltage and frequency for a system, and the system can operate stably.
Description
technical field [0001] The invention relates to a control method of a micro power supply with hysteresis output characteristics. Background technique [0002] Vigorously promoting the development and utilization of new energy is an effective measure to solve the current energy shortage crisis and alleviate the pressure of environmental protection. With the strong support of governments in various countries, distributed power generation technologies that are environmentally friendly, efficient, flexible, and based on renewable energy have been obtained. rapid development. In order to give full play to the advantages of distributed power generation and solve the contradictions between the large power grid and the large power grid, the distributed power generation system is generally operated in the form of a micro-grid. However, with the access of the micro-grid, some new problems have emerged. What kind of control method the power grid adopts in the island operation mode can...
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IPC IPC(8): H02J3/00H02J3/38
Inventor 王以笑崔丽艳雷振锋路进升唐云龙孔波利王留送唐宇
Owner XJ ELECTRIC