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DC/DC bidirectional converter stabilization direct current bus voltage optimal control method

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: 2017-11-14
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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  • DC/DC bidirectional converter stabilization direct current bus voltage optimal control method
  • DC/DC bidirectional converter stabilization direct current bus voltage optimal control method
  • DC/DC bidirectional converter stabilization direct current bus voltage optimal control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] Example 1: When the system runs for 1s, 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), the DC bus voltage contrast waveform in the optimal control method of the present invention is as follows Image 6 Shown. The waveform of the inductor current on the energy storage side under optimal control provided by the present invention is as follows Figure 7 Shown.

[0130] by Image 6 It can be seen that, compared to the traditional PI control method and the linear optimal control method, the DC bus voltage under the optimal control method provided by the present invention has a shorter adjustment time, and no oscillation occurs during the transition process of voltage adjustment. , The overshoot is within the allowable range of the project. by Figure 7 It can be seen that under the method of the present invention, the energy storage unit can quic...

Embodiment 2

[0131] Embodiment 2: When the system runs to 1s, the active power in the DC microgrid increases suddenly by 80kW, the DC load increases by 80kW at 1.5s, and the DC load increases by 100kW at 2s. The DC / DC bidirectional converter adopts the optimal control method provided by the present invention, and the DC bus voltage waveform and the energy storage side inductor current waveform are respectively as follows Figure 8 with Picture 9 Shown.

[0132] by Figure 8 with Picture 9 It can be seen that the DC / DC bidirectional converter works in both buck and boost modes, 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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PUM

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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 stable DC bus voltage of a DC / DC bidirectional converter. Background technique [0002] As the proportion of new energy integrated into the grid and the number of DC loads are increasing, DC microgrid has become one of the hot spots of research. In the DC microgrid, there is no need to consider the issues of power angle stability and frequency stability, which can effectively reduce energy conversion links. The DC bus voltage is an important index to evaluate the normal and stable operation of the DC microgrid. Therefore, it is necessary to design corresponding control strategies to maintain the DC bus voltage stability. The energy storage unit in the DC microgrid is usually selected, and the DC / DC bidirectional converter is used to stabilize the DC bus voltage and smooth the power fluctuations in the microgrid. [0003] The DC / DC bidirecti...

Claims

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Application Information

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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)