Ring current control method and device for inverter parallel system and inverter parallel system
A circulating current control and inverter technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the adverse effects of reliable system operation, positive bus capacitor C1 voltage rise, inverter In order to prevent the voltage increase of the busbar capacitor of the transformer and other problems, the effect of avoiding the voltage rise of the positive and negative busbars until overvoltage and improving the accuracy is achieved.
Active Publication Date: 2012-07-11
HUAWEI DIGITAL POWER TECH CO LTD
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like figure 2 As shown, in the inverter, the continuous negative circulating current flowing through the inductor L1, the switch Q2, the switch Q1, the positive bus capacitor C1 and the negative bus capacitor C2 will increase the voltage of the positive bus capacitor C1, so it can be seen that , under the continuous effect of small circulating current, it is easy to cause the bus capacitor voltage of some inverters to rise continuously until overvoltage, which has an adverse effect on the reliable operation of the system
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[0027] 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.
[0028] An embodiment of the present invention provides a circulating current control method for an inverter parallel system, such as figure 1 As shown, the method includes:
[0029] 101. Obtain the voltage rise of the positive or negative bus of the inverter in the inverter parallel system due to the circulating current of the inverter parallel system;
[0030] In the embodiment of the present invention, the inverter parallel system includes a plurality of paralle...
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The embodiment of the invention provides a ring current control method and device for an inverter parallel system and an inverter parallel system, which relate to the technical field of power supplies and are used for increasing the control accuracy of ring current in the inverter parallel system. The ring current control method of the inverter parallel system comprises the following steps of: acquiring the voltage increasing amount of a positive bus or negative bus of an inverter in the inverter parallel system caused by ring current in the inverter parallel system; acquiring first ring current which causes the increase of the voltage of the positive bus or negative bus according to the voltage increasing amount; sampling the ring current in the inverter parallel system through a current sampling circuit to obtain second ring current; and taking the current sum of the first ring current and the second ring current as current applied to current sharing control in the inverter parallel system.
Description
technical field [0001] The present invention relates to the technical field of power supplies, in particular to a method and device for controlling the circulation of an inverter parallel system and the inverter parallel system. Background technique [0002] In the inverter parallel system, there are more or less differences in voltage, frequency, waveform, phase or phase sequence among the inverters participating in parallel connection, and this difference will make the inverters connected in parallel The circulating current that affects the normal operation of the system is generated. In order to eliminate the impact of this circulating current on the inverter parallel system, it is necessary to control the circulating current in the inverter parallel system. control to eliminate the circulating current in each inverter as much as possible. At present, the method adopted in the industry is to detect the size of the circulating current of each inverter in the system, and p...
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IPC IPC(8): H02M7/493
CPCH02M7/487
Inventor 舒畅
Owner HUAWEI DIGITAL POWER TECH CO LTD