Isolated AC/DC converter control method based on modulation signal compensation
A converter control and modulation signal technology, which is applied in the output power conversion device, the conversion of AC power input to AC power output, and the conversion of AC power input to DC power output, etc., can solve the complex mathematical relationship between control variables and driving signals, It is difficult to ensure the quality of grid-side current, increase the amount of controller calculation, etc., to achieve the effect of facilitating stability analysis, improving soft switching characteristics, and reducing open-loop loss
Active Publication Date: 2022-01-18
CHINA UNIV OF MINING & TECH
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However, in the case of virtual current quadrature, it is greatly affected by the background harmonics of the power grid, and it is difficult to ensure the quality of the grid-side current. At the same time, the process of outputting the control signal to the converter under this current control strategy is a nonlinear link, and the relationship between the control variable and the driving signal The mathematical relationship between them is complicated, which increases the calculation amount of the controller and is not conducive to stability analysis
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[0071] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. (The support of the following embodiment and the mathematical relationship method seems to be insufficiently connected)
[0072] figure 1 It is the topological diagram of the single-phase single-stage bidirectional isolated AC / DC converter based on the closed-loop compensation of the modulation signal in this embodiment, including an input LC filter, a matrix converter, a high-frequency isolation transformer, a DC-side full-bridge converter and an output Stabilizing capacitor C t and load. The matrix converter consists of four four-quadrant switches S 11 -S 14 , each four-quadrant switch consists of two common-emitter power switch tubes S 1ia , S 1ib(i＝1,2,3,4) Composition; DC side full-bridge converter contains four two-quadrant switches S 21 -S 24 ; One side of the matrix converter is connected to the input LC filter, and the ...
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The invention discloses an isolated AC / DC converter control method based on modulation signal compensation. The method comprises the steps of firstly carrying out high-frequency carrier phase shift through employing the output of a DC voltage control loop as an external phase shift angle so as to control the transmission size and direction of active power; secondly, obtaining a grid-side current reference value by using a mathematical relationship between a phase shift ratio and a grid-side current component, and further introducing a current control loop to compensate a modulation wave signal; and finally, generating a switch tube trigger pulse by using the synthesized modulation signal and the phase-shift carrier signal. Therefore, target voltage output of the converter is realized, and relatively high grid-side current quality is ensured at the same time; the sudden change of the grid-side current switching period caused by voltage mismatching during power transmission is avoided, the soft switching characteristic of a converter is improved, and the conduction loss is reduced; and mapping and application of a traditional PWM converter control method are facilitated, the dynamic performance of the system is improved, and the application range is expanded.
Description
technical field [0001] The invention relates to an AC / DC converter control method, in particular to a single-phase single-stage bidirectional isolation AC / DC converter control method based on modulation signal closed-loop compensation. Background technique [0002] With the increasing market share of electric vehicles, how to efficiently utilize vehicle batteries has become a research hotspot at home and abroad, and V2G technology, which centers on electric vehicle energy storage and feeding power to the grid, has emerged as the times require. When the grid load is high, electric vehicles are used to store energy to send power to the grid; when the grid load is low, electric vehicles are used to store excess power generation. V2G technology can realize the two-way interaction between the power grid and vehicles, improve the load curve of the power grid through peak shaving and valley filling, and achieve load balancing to improve the utilization rate of the power grid. The ...
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IPC IPC(8): H02M7/219H02M5/293H02M1/088
CPCH02M7/219H02M5/293H02M1/088Y02B70/10
Inventor 李小强徐荣姬叶继铭黄金伟谢淼伍小杰
Owner CHINA UNIV OF MINING & TECH