Minimum backflow power phase shift control method for isolated-type bidirectional DC converter

A bidirectional DC conversion and phase-shift control technology, which is applied in the direction of DC power input conversion to DC power output, control/regulation system, output power conversion device, etc., can solve the problem of excessive IBDC peak current, increased system path loss, Reduced power transmission efficiency and other issues, to achieve the effect of improving conversion efficiency, reducing peak current and current stress, and small return power
CN106981992AInactive Publication Date: 2017-07-25STATE GRID CORP OF CHINA +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2017-07-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a minimum backflow power phase shift control method for an isolated-type bidirectional DC converter, and relates to the technical field of power and electronic transformer control methods. The method comprises the following steps: enabling a control system to control a sampling chip to collect an output voltage V2 and an output current i2, and determining the output power of the converter through the output voltage V2 and the output current i2; obtaining a standard transmission power p through dividing the transmission power by the maximum transmission power PN of the isolated-type bidirectional DC converter; calculating an internal phase shift angle d1 according to different ranges of the standard transmission power p and a minimum backflow power; solving the difference between the output voltage V2 and a given output voltage V2ref, and obtaining an external phase shift angle d2 through a PI controller; carrying out the pulse generation according to the internal phase shift angle d1 and the external phase shift angle d2, and enabling the output voltage V2 to be constant through the closed-loop adjustment of the value of the external phase shift angle d2 The method is simple in control, and is easy to implement.
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Description

technical field

[0001] The invention relates to the technical field of power electronic transformer control methods, in particular to a minimum return power phase-shift control method for an isolated bidirectional DC converter. Background technique

[0002] Isolated bidirectional DC-DC converter (IBDC) has a distributed, modular and plug-and-play software and hardware structure. The series technology increases the voltage level, and the low-voltage side adopts the parallel technology to increase the power level, thereby realizing energy conversion and electrical isolation. Isolated bidirectional DC converters generally adopt phase-shift control at present, and dual-phase-shift (Dual-Phase-Shift, DPS) is the most widely used algorithm for IBDC. The control is flexible and the dynamic performance is good. In the traditional dual-phase-shift control method, IBDC has shortcomings such as excessive peak current and excessive switch stress. A large amount of backflow power is the...

Claims

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