Reliable parallel control system and method for efficient bidirectional power conversion module

Abstract

The invention belongs to the technical field of advanced control of a high-performance power conversion system, and particularly relates to a reliable parallel control system and method for a high-efficiency bidirectional power conversion module, and the system comprises a bipolar current space vector modulation module, an input current-sharing backstepping control module, and an output voltage-sharing backstepping control module. Wherein the input current-sharing backstepping control module comprises an output current outer loop backstepping controller, an output voltage middle loop backstepping control unit and an input current inner loop backstepping control unit; the output voltage-sharing backstepping control module comprises an output voltage outer loop backstepping control unit and an input current inner loop backstepping control unit; the current stress and the voltage stress of the switching tube are greatly reduced, and the modular design is adopted, so that the capacity expansion is easy; according to analysis from the angle of energy conservation, output voltage sharing and input current sharing of each module serve as entry points, power balance between the modules is achieved through a power balance backstepping control method, and the safety and reliability of the parallel system are effectively improved.

Description

technical field

[0001] The present disclosure belongs to the technical field of advanced control of high-performance power conversion systems, and in particular relates to a reliable parallel control system and method for high-efficiency bidirectional power conversion modules. Background technique

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] The high-efficiency bidirectional power conversion system is widely used in electric vehicle charging, power battery testing, battery energy storage and other applications, and is a common key technology for the above applications. Conventional power conversion systems often use two-stage structures of AC / DC and DC / DC, which not only require more power switches, complicated drive circuit designs, but also bulky DC bus capacitors, making it difficult to further improve the efficiency and power density of the scheme. . ...

Examples

Embodiment 1

[0059] This embodiment introduces a modular high-frequency chain-matrix converter.

[0060] like figure 1 As shown, the modular high-frequency chain-matrix converter used in this embodiment is an input-side parallel output-side series modular high-frequency chain-matrix converter (IPOS-HFLMC), including a first high-frequency chain-matrix converter sub-module HFLMC-1 and a second High-frequency chain matrix converter sub-module HFLMC-2; wherein, the three-phase input terminals of HFLMC-1 and HFLMC-2 are connected to the three-phase power grid in parallel, and the negative pole of the output capacitor of HFLMC-1 is connected to the positive pole of the output capacitor of HFLMC-2. The positive terminal of the HFLMC-1 output capacitor is connected to the positive terminal of the load battery, and the negative terminal of the HFLMC-2 output capacitor is connected to the negative terminal of the battery load.

[0061] exist figure 1 in, e a , e b , e c is the three-phase grid...

Embodiment 2

[0064] The second embodiment of the present disclosure introduces a reliable parallel control system for high-efficiency bidirectional power conversion modules based on the modular high-frequency chain-matrix converter introduced in the first embodiment.

[0065] In this embodiment, the power balance backstepping control includes an input current sharing backstepping control module (current sharing mode) and an output voltage sharing backstepping control module (voltage sharing mode). In the actual battery charge and discharge process, there are two methods of constant current charge and discharge and constant voltage charge and discharge. In the embodiment, the input current sharing backstep control module is suitable for constant current charging and discharging, and the output voltage sharing backstepping control module is suitable for constant voltage charging and discharging. The overall control block diagram is as follows: figure 2 shown.

[0066] Current sharing mode ...

Embodiment 3

[0080] The third embodiment of the present disclosure introduces a method for a reliable parallel control system based on the high-efficiency bidirectional power conversion module introduced in the first embodiment.

[0081] A reliable parallel control method for a high-efficiency bidirectional power conversion module, including a current sharing mode and a voltage sharing mode; wherein, the specific process of the current sharing mode is:

[0082] Obtain the output voltage reference value and output current error variable of each HFLMC module according to the received given output current reference value and the output current actual value and output voltage actual value of the modular high-frequency link-matrix converter;

[0083] According to the actual value of the output current and the actual value of the output voltage of the modular high-frequency chain-matrix converter, as well as the reference value of the input current on the d-axis of the active component and the ou...

technical field

[0001] The present disclosure belongs to the technical field of advanced control of high-performance power conversion systems, and in particular relates to a reliable parallel control system and method for high-efficiency bidirectional power conversion modules. Background technique

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] The high-efficiency bidirectional power conversion system is widely used in electric vehicle charging, power battery testing, battery energy storage and other applications, and is a common key technology for the above applications. Conventional power conversion systems often use two-stage structures of AC / DC and DC / DC, which not only require more power switches, complicated drive circuit designs, but also bulky DC bus capacitors, making it difficult to further improve the efficiency and power density of the scheme. . ...

Examples

Embodiment 1

[0059] This embodiment introduces a modular high-frequency chain-matrix converter.

[0060] like figure 1 As shown, the modular high-frequency chain-matrix converter used in this embodiment is an input-side parallel output-side series modular high-frequency chain-matrix converter (IPOS-HFLMC), including a first high-frequency chain-matrix converter sub-module HFLMC-1 and a second High-frequency chain matrix converter sub-module HFLMC-2; wherein, the three-phase input terminals of HFLMC-1 and HFLMC-2 are connected to the three-phase power grid in parallel, and the negative pole of the output capacitor of HFLMC-1 is connected to the positive pole of the output capacitor of HFLMC-2. The positive terminal of the HFLMC-1 output capacitor is connected to the positive terminal of the load battery, and the negative terminal of the HFLMC-2 output capacitor is connected to the negative terminal of the battery load.

[0061] exist figure 1 in, e a , e b , e c is the three-phase grid...

Embodiment 2

[0064] The second embodiment of the present disclosure introduces a reliable parallel control system for high-efficiency bidirectional power conversion modules based on the modular high-frequency chain-matrix converter introduced in the first embodiment.

[0065] In this embodiment, the power balance backstepping control includes an input current sharing backstepping control module (current sharing mode) and an output voltage sharing backstepping control module (voltage sharing mode). In the actual battery charge and discharge process, there are two methods of constant current charge and discharge and constant voltage charge and discharge. In the embodiment, the input current sharing backstep control module is suitable for constant current charging and discharging, and the output voltage sharing backstepping control module is suitable for constant voltage charging and discharging. The overall control block diagram is as follows: figure 2 shown.

[0066] Current sharing mode ...

Embodiment 3

[0080] The third embodiment of the present disclosure introduces a method for a reliable parallel control system based on the high-efficiency bidirectional power conversion module introduced in the first embodiment.

[0081] A reliable parallel control method for a high-efficiency bidirectional power conversion module, including a current sharing mode and a voltage sharing mode; wherein, the specific process of the current sharing mode is:

[0082] Obtain the output voltage reference value and output current error variable of each HFLMC module according to the received given output current reference value and the output current actual value and output voltage actual value of the modular high-frequency link-matrix converter;

[0083] According to the actual value of the output current and the actual value of the output voltage of the modular high-frequency chain-matrix converter, as well as the reference value of the input current on the d-axis of the active component and the ou...

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