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CN-122001228-A - ISOP-DAB converter decoupling modeling and supercoiled sliding mode control method integrating input voltage equalizing information

CN122001228ACN 122001228 ACN122001228 ACN 122001228ACN-122001228-A

Abstract

The invention discloses an ISOP-DAB converter decoupling modeling and supercoiled sliding mode control method which fuses input voltage equalizing information, aiming at the problems of coupling of an input equalizing ring and an output voltage stabilizing ring and high-frequency buffeting of the ISOP-DAB converter, an input voltage differential error is defined to reduce buffeting caused by uncertainty of parameters of the input equalizing ring, and introducing control compensation quantity to realize complete decoupling between the input voltage equalizing control loop and the output voltage control loop, constructing a double-loop independently controllable complete decoupling controllable model, designing a supercoiled sliding mode control strategy for the input equalizing control loop and the output voltage control loop respectively for considering the rapidity and high robustness of the system, and obtaining the parameter value constraint of the controller through Lyapunov stability theory analysis. The method can remarkably improve the rapid equalization capability of the input voltage and the stable regulation performance of the output voltage of the ISOP-DAB converter, and enhance the robustness of the system and the buffeting suppression capability while improving the dynamic response speed.

Inventors

  • YANG MING
  • JIN HUILIN
  • SIMA WENXIA
  • FENG MOKE
  • YUAN TAO
  • SUN POTAO

Assignees

  • 重庆大学

Dates

Publication Date
20260508
Application Date
20260114

Claims (10)

  1. 1. The ISOP-DAB converter decoupling modeling and supercoiled sliding mode control method integrating input voltage equalizing information is characterized by comprising the following steps of: step 1), constructing a voltage dynamic model input and output by each module of the ISOP-DAB converter; Step 2) defining a new control quantity for linearizing nonlinear coupling items in the voltage dynamic model, and reducing voltage differential errors of explicit disturbance items in the voltage dynamic model; Step 3) based on the new control quantity and the voltage differential error, realizing complete decoupling of the input equalizing ring and the output voltage ring, so as to optimize the voltage dynamic model into a complete decoupling controllable model; step 4) designing a double-ring supercoiled sliding mode controller based on the complete decoupling controllable model; And 5) determining the controller parameter constraint of gradual stability of the system, and completing the control of the ISOP-DAB converter by using the double-ring supercoiled sliding mode controller under the condition of meeting the controller parameter constraint.
  2. 2. The method for controlling decoupling modeling and supercoiled sliding mode of an ISOP-DAB converter with integrated input voltage equalizing information according to claim 1, wherein in step 1), the ISOP-DAB converter comprises n cascaded dual-active bridge DAB modules.
  3. 3. The method for decoupling modeling and supercoiled sliding mode control of an ISOP-DAB converter with integrated input voltage equalizing information according to claim 1, wherein in step 1), the voltage dynamic model input and output by each module of the ISOP-DAB converter is constructed according to the law of conservation of energy and the law of kirchhoff current.
  4. 4. The method for decoupling modeling and supercoiled sliding mode control of an ISOP-DAB converter with integrated input voltage equalizing information according to claim 1, wherein in step 1), the voltage dynamic model input and output by each module of the ISOP-DAB converter is as follows: (1) Wherein N is the transformation ratio of a high-frequency transformer of each module of the system, f is the switching frequency of a switching device of each module, L s is the sum of auxiliary inductance of each module and leakage inductance reduced to the primary side of the transformer, C d is the input filter capacitance of each module, C f is the output filter capacitance of the system, v o is the output voltage of the system, i in is the input current of the system, v ini is the input voltage of the module i, R load is the load of the output side, i=1, 2.
  5. 5. The method for decoupling modeling and supercoiled sliding mode control of an ISOP-DAB converter with integrated input voltage equalizing information according to claim 1, wherein in step 2), the new control amount is D is the common shift phase of each module of the ISOP-DAB converter; The linear relation between the new control amounts of different modules is that ; The common shift phase of each module of the ISOP-DAB converter is output by an output voltage loop; the new equalizing correction quantity of each module is output by an input equalizing ring; The new control amount of the module i is the actual control amount acting on each module.
  6. 6. The method for decoupling modeling and supercoiled sliding mode control of an ISOP-DAB converter with integrated input voltage equalization information of claim 1, wherein in step 2), the voltage differential error is Wherein The instantaneous average input voltage value of each module of the ISOP-DAB converter is obtained; is the input voltage value of the ISOP-DAB converter module i.
  7. 7. The method for controlling decoupling modeling and supercoiled sliding mode of an ISOP-DAB converter with integrated input voltage equalizing information according to claim 1, wherein in step 3), the step of implementing complete decoupling of the input voltage equalizing ring and the output voltage ring comprises: step 3.1) utilizing constraints And eliminating the coupling of the correction quantity among the modules, and constructing a complete decoupling input equalizing first-order differential equation only related to the equalizing correction quantity F si , namely: (2) Step 3.2) designing the output voltage control offset V in is the input voltage; Is the input voltage deviation; Step 3.3) controlling the amount of compensation using the output voltage The coupling influence of the input voltage deviation on the output voltage ring is counteracted, and a completely decoupled output voltage first-order differential equation which is only related to the common control quantity F o is constructed, namely: (3) Step 3.4) constructing a complete decoupling controllable model, which comprises a complete decoupling input voltage equalizing first-order differential equation and a complete decoupling output voltage first-order differential equation.
  8. 8. The method for controlling decoupling modeling and supercoiled sliding mode of an ISOP-DAB converter with integrated input voltage equalizing information according to claim 1, wherein in step 4), the double-loop supercoiled sliding mode controller is as follows: (4) Wherein the parameters are Parameter(s) Parameter(s) E is tracking error, k 1 、k 2 、k 3 and k 4 are sliding mode surface gains which are positive real parameters to be set, s i is a sliding variable of an input equalizing ring, s is a sliding variable of an output voltage ring; ; ; 、 gain for the ultra-spiral algorithm of the input equalizing ring; 、 the gain of the voltage loop supercoiled algorithm is output.
  9. 9. The method for controlling decoupling modeling and supercoiled sliding mode of an ISOP-DAB converter with integrated input voltage equalizing information according to claim 1, wherein the controller parameter constraints for progressive stabilization of the system are as follows: (5) In the parameters of Parameter(s) ; 、 The upper limit of the input ring disturbance term and the upper limit of the output ring disturbance term are used; And outputting voltage for the system.
  10. 10. The method for performing decoupling modeling and supercoiled sliding mode control of an ISOP-DAB converter with integrated input voltage equalizing information according to claim 1, wherein in step 5), the step of performing ISOP-DAB converter control by using a double-loop supercoiled sliding mode controller comprises the steps of: Step 5.1), under the condition that the parameter constraint of the controller is met, generating the control quantity F i of each module of the ISOP-DAB converter by using the double-loop supercoiled sliding mode controller; Step 5.2) calculating a phase shift ratio D i using an inverse solution function, wherein the phase shift ratio D i satisfies ; And 5.3) taking the shift D i as the direct driving quantity of the PWM modulation module to control the DAB bridge arm conduction moment, thereby realizing the control of the ISOP-DAB converter.

Description

ISOP-DAB converter decoupling modeling and supercoiled sliding mode control method integrating input voltage equalizing information Technical Field The invention relates to the technical field of power electronic converter control, in particular to an ISOP-DAB converter decoupling modeling and supercoiled sliding mode control method integrating input voltage equalizing information. Background Under the national strategy of the novel power system, the ISOP-DAB converter can break through the limit of single-module voltage and current stress through the modularized combination, and improve the transmission power level, and is suitable for medium-high voltage and high power occasions. However, ISOP-DAB converters face serious control challenges in practical applications. On the one hand, the inconsistent parameters of each sub-module can lead to unbalanced input voltage, and if the effective voltage equalizing control is lacked, the module overvoltage damage can be caused. On the other hand, the converter is required to have extremely high dynamic performance under complex working conditions such as power fluctuation, frequent switching of loads and the like in the novel power system. In the prior art, the control of the ISOP-DAB converter mainly has two problems, namely, firstly, in the aspect of input equalizing control, an input equalizing ring in the existing decoupling method generally only considers PI control without model information. Although the structure is simple, when the working condition greatly jumps or approaches to the physical limit, the linear control is difficult to combine the steady-state precision and the dynamic performance, and the efficient adjustment is difficult to realize. In the nonlinear control method, although the sliding mode control has stronger robustness, the inherent high-frequency buffeting phenomenon of the traditional sliding mode control easily causes system oscillation to influence steady-state precision, and in an ISOP-DAB system with multi-variable strong coupling, the problem of double-loop coupling further aggravates the difficulty of control design. Therefore, a high-performance control method capable of realizing complete decoupling by fusing model information and effectively suppressing buffeting is needed. Disclosure of Invention The invention aims to provide an ISOP-DAB converter decoupling modeling and supercoiled sliding mode control method integrating input voltage equalizing information, which comprises the following steps: step 1), constructing a voltage dynamic model input and output by each module of the ISOP-DAB converter; Step 2) defining a new control quantity for linearizing nonlinear coupling items in the voltage dynamic model, and reducing voltage differential errors of explicit disturbance items in the voltage dynamic model; Step 3) based on the new control quantity and the voltage differential error, realizing complete decoupling of the input equalizing ring and the output voltage ring, so as to optimize the voltage dynamic model into a complete decoupling controllable model; step 4) designing a double-ring supercoiled sliding mode controller based on the complete decoupling controllable model; And 5) determining the controller parameter constraint of gradual stability of the system, and completing the control of the ISOP-DAB converter by using the double-ring supercoiled sliding mode controller under the condition of meeting the controller parameter constraint. Further, in step 1), the ISOP-DAB converter comprises n cascaded dual active bridge DAB modules. In step 1), the voltage dynamic model input and output by each module of the ISOP-DAB converter is constructed according to the law of conservation of energy and the law of kirchhoff current. Further, in step 1), the voltage dynamic model input and output by each module of the ISOP-DAB converter is as follows: (1) Wherein N is the transformation ratio of a high-frequency transformer of each module of the system, f is the switching frequency of a switching device of each module, L s is the sum of auxiliary inductance of each module and leakage inductance reduced to the primary side of the transformer, C d is the input filter capacitance of each module, C f is the output filter capacitance of the system, v o is the output voltage of the system, i in is the input current of the system, v ini is the input voltage of the module i, R load is the load of the output side, and i=1, 2. Further, in step 2), a new control amountD is the common shift phase of each module of the ISOP-DAB converter; The linear relation between the new control amounts of different modules is that ;The common shift phase of each module of the ISOP-DAB converter is output by an output voltage loop; the new equalizing correction quantity of each module is output by an input equalizing ring; The new control amount of the module i is the actual control amount acting on each module. Further, in step 2), the voltage differential