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Inverter active damping control method based on full-state feedback

A technology of damping control and state feedback, applied in the direction of converting irreversible DC power input to AC power output, output power conversion devices, electrical components, etc., to achieve the effect of simple algorithm, simple and practical design process, and high reliability

Inactive Publication Date: 2017-09-05
TIANJIN WEIHAN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose an active damping control method for inverters based on full state feedback, which is an active damping control method for LCL grid-connected inverters that does not require passive devices such as resistors to be added to the filter branch , to solve the inherent resonance problem of the LCL type grid-connected inverter, and effectively improve the efficiency and stability of the inverter

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  • Inverter active damping control method based on full-state feedback
  • Inverter active damping control method based on full-state feedback
  • Inverter active damping control method based on full-state feedback

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specific Embodiment approach 1

[0022] Specific implementation mode one: as figure 1 As shown, an inverter active damping control method based on full state feedback:

[0023] Step 1: In each sampling period, the bridge arm current i 1 , Inverter grid-connected current i 2 and filter capacitor voltage u c Perform asymmetric regular sampling;

[0024] Step 2: Grid-connected current given value and the feedback value i 2 Subtraction, the obtained current error value passes through the proportional-resonant regulator, and outputs the control signal u of the grid-connected current regulator ctrl ;

[0025] Step 3: The state quantity bridge arm current i 1 , filter capacitor voltage u c and grid current i 2 Respectively and the state feedback coefficient k 1 , k 2 , k 3 multiplied to get the full state feedback signal u feed ;

[0026] Step 4: Connect the output control signal u of the grid-connected current regulator ctrl and full state feedback signal u feed subtraction, plus the feed-forward s...

specific Embodiment approach 2

[0028] Specific embodiment 2: This embodiment is a further description of specific embodiment 1. In the step 3, the state feedback coefficient k 1 , k 2 , k 3 The value of is:

[0029] For the state-space model of the LCL filter ∑ 0

[0030]

[0031] In the formula, x——state variable matrix;

[0032] y——output variable matrix;

[0033] u——input variable matrix;

[0034] —state variable derivative matrix;

[0035] A - state matrix;

[0036] b - input matrix;

[0037] c - output matrix.

[0038] Through the state feedback matrix K, we have

[0039] det[λI-(A-bK)]=f * (λ)

[0040] In the formula, det——calculate matrix determinant;

[0041] λ—the eigenvalue of the system matrix;

[0042] K——state feedback matrix;

[0043] I——identity matrix;

[0044] A - state matrix;

[0045] b - input matrix;

[0046] f * (λ)——characteristic polynomial of system expectation matrix;

[0047]

[0048] where f * (λ)——characteristic polynomial of system expectation matri...

Embodiment 1

[0093] This embodiment discloses an active damping control method for an inverter with full state feedback, which belongs to an improved control method for grid-connected current closed-loop control of an inverter. This control method does not need to adjust the control parameters of the LCL filter and the grid-connected inverter current loop, but only needs to increase the control parameters of the active damping link of the state feedback channel.

[0094] The active damping control method of the inverter based on full state feedback of the present invention is as follows:

[0095] like figure 1 As shown, the LCL grid-connected inverter includes two parts, the main circuit and the control device. The part below the dotted line is the full-state feedback active damping control and current closed-loop control device applied to the LCL grid-connected inverter of the present invention.

[0096] figure 2 It is a control block diagram of an inverter active damping control metho...

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Abstract

An inverter active damping control method based on full-state feedback belongs to the distributed grid-connected generation technology field. The method includes the following steps: conducting asymmetric rule sampling on a bridge arm current i1, an inverter grid-connected current i2 and a filter capacitance voltage uc in each sampling period; subtracting a grid-connected current given value i<2><*> from a feedback value i2 to obtain a current error value which passes through a proportion-resonance regulator, and outputting a control signal uctrl of a grid-connected current regulator; multiplying the state quantity bridge arm current i1, the filter capacitance voltage uc and the grid-connected current i2 by a state feedback coefficient k1, a state feedback coefficient k2 and a state feedback coefficient k3 respectively to obtain a full-state feedback signal ufeed; subtracting the output control signal uctrl of the grid-connected current regulator from the full-state feedback signal ufeed and then adding a feedforward signal uPCC of a common coupling point voltage, the result being a modulation signal u<inv><*> of an inverter; and comparing the modulation signal of the inverter with a high-frequency triangular carrier wave, and generating a PWM pulse. Positions of three poles of an LCL-type grid-connected inverter can be matched freely, and the design process is easy and practical.

Description

technical field [0001] The invention relates to an active damping control method of an inverter based on full state feedback, and belongs to the technical field of distributed grid-connected power generation. Background technique [0002] Compared with single-inductance grid-connected inverters, grid-connected inverters based on LCL filters have significant advantages, but there are resonance problems. Especially in the distributed microgrid, the grid impedance is large and changes with the operation mode, which causes the bandwidth change and phase shift of the LCL filter, affects its control performance, and may even lead to system instability. [0003] In the synchronous coordinate system, the three-phase AC signal is transformed into a two-phase DC signal through abc / dq coordinate transformation. However, there is coupling between the transformed dq components, and this problem becomes particularly prominent in the case of LCL filters, which seriously affects the dynami...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M1/12
CPCH02M7/48H02M1/126
Inventor 纪彦禹胡锡金
Owner TIANJIN WEIHAN ELECTRIC CO LTD
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