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Bidirectional buck-boost converter control method based on reduced-order active-disturbance-rejection strategy

A converter control, active disturbance rejection controller technology, applied in control/regulation systems, output power conversion devices, conversion of DC power input to DC power output, etc. The problem of sudden change in voltage and high complexity can achieve the effect of small overshoot and fluctuation amplitude, improving dynamic response performance and reducing complexity

Active Publication Date: 2021-10-29
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can realize the problem of DC bus voltage instability caused by photovoltaic output fluctuations and load uncertainties, it does not consider the sudden change of the output voltage reference value, and at the same time cannot achieve inductor current limiting; patent document CN104734532B discloses a A composite control method and device for a Buck-Boost matrix converter. The method uses the two state variables of the capacitor voltage and the inductor current in the Buck-Boost matrix converter as the system control variables. Control the closed-loop control, so as to adjust the inductor current and capacitor voltage to change according to the determined reference value, so that the output voltage of the Buck-Boost matrix converter output is highly consistent with its reference value
Although this method can accurately track the reference output voltage to effectively deal with its sudden change, and set a limiter to avoid abnormal values ​​of the inductor current, it does not consider the two conditions of load change and power supply voltage change. At the same time, there are many controllers in the composite control device provided by the method, the complexity of control is high, and the amount of calculation is large

Method used

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  • Bidirectional buck-boost converter control method based on reduced-order active-disturbance-rejection strategy
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  • Bidirectional buck-boost converter control method based on reduced-order active-disturbance-rejection strategy

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Embodiment 1

[0066] refer to Figure 1~4 , which is the first embodiment of the present invention, provides a bidirectional buck-boost converter control method based on a reduced-order active disturbance rejection strategy, which includes:

[0067] S1: Sampling the bidirectional buck-boost converter output voltage u C , the error is obtained by comparing the extended state observer in the outer loop ADRC controller with the reference output voltage value of the tracking differentiator;

[0068] S2: The error passes through the nonlinear control law in the outer loop ADRC controller and compensates the external disturbance signal in the extended state observer to obtain the inner loop current reference value i L_ref ;

[0069] S3: Inner loop current reference value After the inner loop model predictive control process, the PWM duty cycle d is obtained, and then used to drive the switch tube to work;

[0070] S4: In the next working cycle, check whether the output voltage and current of...

Embodiment 2

[0085] refer to Figure 2-5 , is the second embodiment of the present invention, and this embodiment is different from the first embodiment in that: the step of establishing the bidirectional buck-boost converter mathematical model also includes: ignoring the secondary and above disturbance items to obtain the bidirectional buck -boost transformer linearization model is

[0086]

[0087] Compared with Embodiment 1, further, the step of S12 constructing the reduced-order expression of the transfer function from the duty cycle to the inductor current includes: performing Laplace transformation on the formula (3), and obtaining the ratio from the duty cycle to the inductor current after finishing. Transfer Function:

[0088]

[0089] The first-order expression is obtained after ignoring its constant term:

[0090]

[0091] The frequency response comparison before and after the order reduction is as follows: Figure 5 shown.

Embodiment 3

[0093] refer to figure 1 and 7 ~10, is the third embodiment of the present invention, and this embodiment is different from the second embodiment in that: S13 constructs the steps of reducing the order expression of the voltage outer loop and current inner loop transfer function as follows: adopt formula (5) Substituting formula (4) as the transfer function from the duty cycle to the inductor current, the transfer function of the voltage outer loop control object and the current inner loop i L_ref to i L The reduced-order expressions of the closed-loop transfer function are:

[0094]

[0095]

[0096] where f s is the control frequency, T s is the control cycle, where the current inner loop control schematic diagram is as follows Figure 6 shown.

[0097] When the inductor current reference value iL _ref When a mutation occurs, i L Can quickly adjust to a given value within about 0.2ms; when the voltage reference value u C_ref (Initial value is set to 250V) When a...

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Abstract

The invention discloses a bidirectional buck-boost converter control method based on a reduced-order active-disturbance-rejection strategy. The method comprises the steps of sampling an output voltage uC of a bidirectional buck-boost converter, enabling the output voltage uC to pass through an extended state observer in an outer-loop active-disturbance-rejection controller, comparing the output voltage uC with a reference output voltage value of a tracking differentiator, and obtaining an error; enabling the error to pass through a nonlinear control law in the outer-loop active-disturbance-rejection controller, and compensating an external disturbance signal in the extended state observer to obtain an inner-loop current reference value iL_ref; and enabling the inner-loop current reference value to be subjected to inner loop model prediction control processing to obtain a PWM duty ratio d, and then driving a switching tube to work by using the PWM duty ratio d. According to the bidirectional buck-boost converter control method based on the reduced-order active-disturbance-rejection strategy provided by the invention, when the bidirectional buck-boost converter is controlled, the complexity of an active-disturbance-rejection controller is reduced by performing reduced-order simplification on a control object at a high frequency band; and when the bidirectional buck-boost converter is controlled, an ADRC + MPC double-closed-loop structure is adopted, compared with a PI + MPC control strategy, the method has the advantages of being high in response speed and small in overshoot and fluctuation amplitude in the adjustment process, and the dynamic response performance of the bidirectional buck-boost converter is remarkably improved.

Description

technical field [0001] The invention relates to the field of DC converter control, in particular to a bidirectional buck-boost converter control method based on a reduced-order active disturbance rejection strategy. Background technique [0002] In the distributed energy storage system, the bidirectional DC-DC converter, as one of the core components, is used to adjust the output voltage of the energy storage unit, effectively respond to wind power, photovoltaic and other renewable energy output fluctuations, quickly compensate or absorb power problems. For renewable energy applications, the output voltage, power magnitude, and power flow direction of bidirectional DC-DC converters may change frequently, which puts higher requirements on the control performance of bidirectional DC-DC converters. [0003] Active Disturbance Rejection Control (ADRC) and Model Predictive Control (MPC) have been widely used in the control of bidirectional DC-DC converters due to their superior p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/00
CPCH02M3/1582H02M1/00
Inventor 龚春阳黄冬梅李辉时帅
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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