A kind of control method of multilevel converter
A technology of multilevel converters and control methods, which is applied in the direction of electrical components, output power conversion devices, etc., and can solve the problems of poor current output and suppression effects of multilevel converters
Active Publication Date: 2020-02-21
CHNA ENERGY INVESTMENT CORP LTD +1
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Problems solved by technology
[0003] At present, the current output effect of multilevel converters is not good, mainly reflected in the poor suppression effect of low-order (such as 1, 5, 7, 11, 13, etc.) harmonics in the output current and voltage
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[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0021] Before describing the embodiments of the present invention, the control structure model of the multilevel converter in the prior art will be described for better comparison with the technical solutions to be described in the embodiments of the present invention. Such as image 3 As shown in , a schematic diagram of a control structure model of a multilevel converter in the prior art is shown. In the control structure, I fa * , I fb * , I fc * is the given value of the three-phase grid-connected current, I fa * , I fb * , I fc * Generate I after abc / αβ transformation fα * , I fβ * , and further get the current value I in the two-phase synchronous rotating coordinate system (dq coordinate system) through αβ / dq transformation fd * , I fq * , I fd * , I fq * Generate output V after dq / αβ transformation α * , V β * , V α * , V ...
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The invention provides a control method of a multi-level converter. The control method comprises the following steps: carrying out abc / alpha beta conversion on three-phase grid-connected current values I<fa><*>, I<fb><*> and I<fc><*> to obtain current values I<f[alpha]><*>, I<f[beta]><*>, and carrying out alpha beta / dq conversion and low-pass filter treatment to obtain current values I<fd1><*> and I<fq1><*> under a two-phase synchronous rotating reference frame; carrying out abc / alpha beta conversion on three-phase grid-connected current feedback current values Ifa, Ifb and Ifc, carrying out further alpha beta / dq conversion to obtain corresponding current values Ifd and Ifq under the two-phase synchronous rotating reference frame, carrying out PI conversion and dq / alpha beta conversion to generate primary voltage output values V<[alpha]1><*> and V<[beta]1><*> by a subtracter, and carrying out alpha beta / abc conversion to generate a target voltage output value. According to the control method, the low-order harmonics, such as at least one of one-order, five-order, seven-order, eleven-order and thirteen-order harmonics, in output current voltage are restricted simply and effectively.
Description
technical field [0001] The invention relates to converter control technology, in particular to a control method for multilevel converters. Background technique [0002] The topology of a multilevel converter such as figure 1 As shown, the multilevel converter includes three pairs of bridge arms, each pair of bridge arms includes an upper bridge arm and a lower bridge arm, and each of the upper bridge arm and the lower bridge arm includes multiple And the sub-module (SM) at the output end and the reactor L, the number of sub-modules is between 1-n. Among them, such as figure 2 As shown, each sub-module includes an IGBT (insulated gate bipolar transistor) half-bridge as a switching unit and a 50ah DC energy storage battery (B 0 ), each sub-module has three switching states: 1) When the upper and lower IGBTs (insulated gate bipolar transistors) of the sub-module are turned off, it is called a latched state, which generally occurs during startup and failure; 2) when the uppe...
Claims
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IPC IPC(8): H02M1/12
Inventor 周友吴峂
Owner CHNA ENERGY INVESTMENT CORP LTD