An optimal control method for the minimum circulating current power of a bidirectional half-bridge three-level dc-dc converter
A half-bridge three-level, minimum power technology, applied in the output power conversion device, the conversion of DC power input to DC power output, and the adjustment of electrical variables, etc., can solve the problem of reducing the efficiency of the converter, increasing the current stress of the switch tube, Problems such as increasing the loss of the switch tube
Active Publication Date: 2017-03-01
SOUTHWEST JIAOTONG UNIV
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
Phase shift control is simple and easy to implement, but there is circulating power in the converter, such as figure 2 In the shaded part of , the circulating power will increase the current stress of the switch tube, thereby increasing the loss of the switch tube and reducing the efficiency of the converter
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[0053] According to the control method provided in the Summary of the Invention, Table 1 provides the D 1 about relational formula. The concrete implementation block diagram that controller realizes the optimized control method that the present invention proposes is as Figure 5 shown.
[0054] The controller includes a voltage control module, D 1 Calculation module and switch signal generation module, which actually adds a D to the existing controller composed of voltage control module and switch signal generation module 1 computing module. First, the voltage control module controls the load side voltage (V 2 ) and reference voltage (V 2ref ) error for feedback control, get shift phase Then, calculate according to Table 1 Corresponding D 1 ; Finally, the modulation module according to D 1 , The two control quantities generate corresponding switching signals to control the on-off of the switching devices in the main circuit.
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The invention discloses an optimal control method suitable for a bidirectional half-bridge three-level DC-DC converter to realize the minimum circulation power. A period of zero level is added to reduce the circulating current power; the circulating current power between the input and output sides is minimized by coordinating the control of the shifting phase and the action time of zero level, thereby reducing the converter loss and improving the overall efficiency of the converter. At the same time, within the entire transmission power range, all the switching tubes in the circuit can realize zero-voltage conduction, which effectively reduces the switching loss of the power device.
Description
technical field [0001] The invention relates to a control method of an isolated bidirectional DC-DC converter, in particular to an optimal control of a bidirectional half-bridge three-level DC-DC converter. Background technique [0002] The isolated bidirectional DC-DC converter can not only realize the electrical isolation of the input and output sides, but also realize the bidirectional transmission of energy. It is widely used in the fields of smart microgrid, distributed power generation system, and electric locomotive traction system. [0003] The structure of the isolated bidirectional half-bridge three-level DC-DC converter is as follows: figure 1 As shown, it consists of two symmetrical half-bridge three-level circuits, an intermediate frequency transformer and four DC stabilizing capacitors. The converter has simple structure, high power density, electrical isolation and bidirectional flow of energy; and the voltage stress of each switching tube in the circuit is ...
Claims
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IPC IPC(8): H02M3/335
Inventor 舒泽亮郭潇潇况祖杭何晓琼
Owner SOUTHWEST JIAOTONG UNIV