A general method for realizing svpwm control of multiphase converters
A general method and converter technology, applied in the direction of AC motor control, control system, motor control, etc., can solve problems such as complex methods, inaccurate calculation of inverter conduction time, difficulty in realizing sampling cycle, etc., to achieve higher voltage Utilization rate, convenient and seamless connection, simple and clear effects of versatility
Active Publication Date: 2020-09-01
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology
There is also a literature that proposes a carrier-based SVPWM technology based on the principle that the reference voltage in the carrier period is equal to the average voltage output by the inverter, but this method cannot accurately calculate the frequency of each bridge arm of the inverter in each sampling period. The on-time of , and the high requirement on the sampling period makes the implementation of this technique difficult
In addition, there are few SVPWM implementation methods for sinusoidal power supply of nine-phase converters at home and abroad, which are still in the initial stage, and the methods in the existing technology are relatively complicated
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[0050] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0051] figure 1 Indicates that the converter supplies power to the stator windings of m (m = 3, 5, 7, 9, ...) phase symmetrical winding motors, U d To supply the DC voltage of the converter; suppose the numbers of the bridge arms of the converter from left to right are 1, 2,..., m, and the xth (x=1, 2,..., m) phase bridge The spatial position of the axes of the arm-connected windings is 2(x-1)π / m. There are 2 m-phase converters m working state, using the switch function S x Indicates that the switch of the upper bridge arm of the xth phase of the converter is turned on, and the switch of the lower bridge arm is turned off, for example S 1 = 1, it means that the upper bridge arm switch of the first phase of the converter is turned on, and the lower bridge arm switch is turned off; if S 1 = 0, and vice versa; other cases are similar.
[0...
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The invention relates to a universal method for realizing multiphase converter SVPWM control. The method comprises the following steps: S1, sector partitioning is carried out on effective voltage vectors of the multiphase converter; S2, a working vector is selected; S3, the sector of a fundamental voltage reference vector is judged; S4, a virtual voltage vector is constructed for each harmonic plane; S5, the lasting time of the working vector is acquired according to the virtual voltage vector; S6, according to the lasting time of the working vector, the on time and the off time of an upper bridge arm switch of a certain phase of an m-phase converter are determined in a continuous SVPWM method based on zero vector symmetric distribution; and S7, according to each harmonic voltage referencevector change, the converter is controlled. Compared with the prior art, the method of the invention has simple and clear generality towards SVPWM control on an odd phase-symmetric multiphase converter, seamless connection between sinusoidal power supply and harmonic injection can be realized conveniently, and the voltage utilization rate is improved.
Description
technical field [0001] The invention relates to the technical field of variable frequency power supply for symmetrical multiphase loads, in particular to a general method for realizing SVPWM control of multiphase converters. Background technique [0002] Energy shortage, environmental pollution and climate warming are the globalization problems faced by human beings in the 21st century, which have aroused widespread attention from countries all over the world to energy-saving technologies, and it is urgent to save energy and reduce consumption. The electric power industry is not only a large production capacity but also a large energy consumer. Energy saving of motors and their systems is a topic of common concern in the international community. In addition to formulating corresponding energy consumption standards and vigorously promoting high-efficiency motors, the saving effect of adopting high-power AC speed control systems is very obvious, and multi-phase motors with sym...
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IPC IPC(8): H02P27/08H02P23/28
CPCH02P23/28H02P27/08H02P2209/11
Inventor 梅柏杉罗娜晋世博张翔健
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER