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An Optimal Control Method for Stabilizing the DC Bus Voltage of a DC/DC Bidirectional Converter

A technology of DC bus voltage and bidirectional converter, which is applied in the field of DC bus voltage control, can solve the problems of switching nonlinearity, non-consideration of nonlinear characteristics, etc.

Active Publication Date: 2019-04-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The DC / DC bidirectional converter has the characteristics of switching nonlinearity, and the traditional control method does not consider its nonlinear characteristics

Method used

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  • An Optimal Control Method for Stabilizing the DC Bus Voltage of a DC/DC Bidirectional Converter
  • An Optimal Control Method for Stabilizing the DC Bus Voltage of a DC/DC Bidirectional Converter
  • An Optimal Control Method for Stabilizing the DC Bus Voltage of a DC/DC Bidirectional Converter

Examples

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Effect test

Embodiment 1

[0127] Example 1: When the system runs for 1 second, the active power in the DC microgrid suddenly increases by 100kW. The DC / DC bidirectional converter adopts the traditional PI control method, linear optimal control (LQR control), and the DC bus voltage comparison waveform in the optimal control method proposed by the present invention is as follows: Figure 5 shown. The current waveform of the energy storage side inductor under the optimal control proposed by the present invention is as follows: Image 6 shown.

[0128] Depend on Figure 5 It can be seen that compared with the traditional PI control method and the linear optimal control method, the DC bus voltage under the optimal control method proposed in the present invention has a shorter adjustment time, and no oscillation phenomenon occurs during the transition process of voltage regulation , the overshoot is within the allowable range of the project. Depend on Image 6 It can be seen that under the method propos...

Embodiment 2

[0129] Example 2: When the system runs for 1s, the active power in the DC microgrid suddenly increases by 80kW, the DC load increases by 80kW in 1.5s, and the DC load increases by 100kW in 2s. The DC / DC bidirectional converter adopts the optimal control method proposed by the present invention, and the DC bus voltage waveform and the energy storage side inductor current waveform are respectively as follows: Figure 7 with Figure 8 shown.

[0130] Depend on Figure 7 with Figure 8 It can be seen that the DC / DC bidirectional converter works in two working modes of step-down and step-up, which can effectively maintain the stability of the DC bus voltage, and can achieve the shortest adjustment time, the overshoot is small enough, and there is no oscillation phenomenon .

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Abstract

The invention provides a DC / DC bidirectional converter stabilization direct current bus voltage optimal control method. The method comprises the steps that in two operating modes of step-up and step-down, the affine nonlinear mathematical model of a DC / DC bidirectional converter is established; the shortest transfer time of state variables in the affine nonlinear mathematical model of the DC / DC bidirectional converter in the step-down mode and the affine nonlinear mathematical model of the DC / DC bidirectional converter in the step-up mode is selected as the performance indicator to construct a time optimal controller, and the time optimal control law is acquired; the quadric form function of state variables in the affine nonlinear mathematical model of the DC / DC bidirectional converter in the step-down mode and the affine nonlinear mathematical model of the DC / DC bidirectional converter in the step-up mode is selected as the performance indicator to construct a state optimal regulator, and the state optimal control law is acquired; a fuzzy rule is established for the time optimal control law and the state optimal control law; a fuzzy adaptive weight coordination controller is constructed; and the weight of the time optimal control law and the state optimal control law is acquired. According to the invention, the optimal control of the DC / DC bidirectional converter is realized.

Description

technical field [0001] The invention relates to a DC bus voltage control method. In particular, it relates to an optimal control method for stabilizing a DC bus voltage of a DC / DC bidirectional converter. Background technique [0002] With the increasing proportion of new energy sources integrated into the grid and the number of DC loads, DC microgrids have become one of the research hotspots. In the DC microgrid, there is no need to consider the problems of power angle stability and frequency stability, which can effectively reduce the energy conversion link. DC bus voltage is an important index to evaluate the normal and stable operation of DC microgrid. Therefore, it is necessary to design a corresponding control strategy to maintain the stability of the DC bus voltage. Usually, the energy storage unit in the DC microgrid is selected, and the DC bus voltage is stabilized by means of a DC / DC bidirectional converter, and the power fluctuation in the microgrid is stabiliz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/14
CPCH02J1/14
Inventor 李鹏李鑫明李继红张亮王敏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)