A three-phase five-level converter capacitor potential balance control method and system
A technology of potential balance and control method, which is applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., and can solve problems such as unsatisfactory effects and complex control methods.
Active Publication Date: 2016-01-06
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
For the three-phase five-level converter shown in Figure 1(a), it needs to control the potential of the midpoint N in balance and control the potential of the flying capacitor C1 of each phase in addition to the general multi-level circuit. Now The control method for the three-phase five-level converter system shown in Figure 1 is relatively complicated to implement, and the effect is not ideal
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[0083] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0084] The embodiment of the present application discloses a three-phase five-level converter capacitor potential balance control method and system to simply and effectively realize the three-phase five-level converter capacitor midpoint potential balance control and the flying capacitor potential of each phase. balance control.
[0085] refer to figure 2 , Embodiment 1 of the present application provides a capacitor potential balance control method for a three-phase five-level converter, ea...
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This application discloses a three-phase five-level converter capacitor potential balance control method and system, which is calculated according to the sorting results of the three-phase output modulation voltage and the corresponding phase output current, reference level and capacitor midpoint voltage offset Zero-sequence component; superimpose the zero-sequence component with the original three-phase output modulation voltage to obtain the modified modulation voltage; detect the voltage of each phase flying capacitor in the three-phase five-level topology, and correct the modulation voltage according to the three-phase current and the voltage of the flying capacitor, determine the switch state combination of the switch tube in the five-level topology of the corresponding phase and the corresponding switch state action time; realize the above switch state combination and its action time by controlling the switch tube, so that the capacitor voltage reaches balance , does not need to add an auxiliary circuit, is low in cost, simple and easy to implement, and ensures the accuracy of the voltage balance control of the converter capacitor; at the same time, it also realizes the potential control of the flying capacitor and solves the problems in the prior art.
Description
technical field [0001] The present application relates to the technical field of electric power control, in particular to a method and system for controlling capacitor potential balance of a three-phase five-level converter. Background technique [0002] In new energy fields such as photovoltaic power generation and wind power generation, multilevel converters have attracted more and more attention because of their characteristics such as large output power, fast dynamic response, and good electromagnetic compatibility. However, because the capacitor potentials of four-level and above-level converters are not easy to balance, the potential control process is complicated, or additional circuit devices need to be added to realize the balance control of each capacitor potential, so the four-level and above-level converters are limited. application of the converter. [0003] In particular, the existing three-phase five-level converter system shown in Figure 1(a) (the five level...
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IPC IPC(8): H02M7/483
CPCH02M7/487H02M1/0095H02M7/4837
Inventor 邹海晏陶磊张建张玉陈长春张明
Owner SUNGROW POWER SUPPLY CO LTD