Optimal control method for grid-connected inverter based on double-filter grid voltage feed-forward

A technology of grid voltage and double filtering, which is applied in the direction of circuit devices, AC network circuits, single-network parallel feeding arrangements, etc., can solve the problem that the amplitude and phase of the output impedance of the grid-connected inverter cannot be taken into account at the same time, and achieve improved stability performance, simple implementation, and good robustness

Active Publication Date: 2021-11-30
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to provide an optimal control method for grid-connected inverters based on double-filter grid voltage feedforward, which solves the problem that the existing control strategy has on the output impedance of grid-connected inverters. The problem that the value and phase cannot be considered at the same time

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  • Optimal control method for grid-connected inverter based on double-filter grid voltage feed-forward
  • Optimal control method for grid-connected inverter based on double-filter grid voltage feed-forward
  • Optimal control method for grid-connected inverter based on double-filter grid voltage feed-forward

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Embodiment 1

[0050] Embodiment 1: as Figure 1 to Figure 6 Shown; An optimal control method for grid-connected inverters based on double-filter grid voltage feedforward, which includes:

[0051] S1: collect the voltage and current at the PCC point and the capacitor current of the LCL filter;

[0052] S2: Extract the phase of the voltage at the PCC point and multiply it with the given grid-connected current value to obtain a given reference signal of the grid-connected current;

[0053] S3: The voltage at the PCC point is output through a power grid voltage feedforward link corrected by a double filter link to output a feedforward signal;

[0054]S4: Comparing the given reference signal with the current at the PCC point to obtain an error signal, and adjusting the error signal through a current regulator to obtain a command signal;

[0055] S5: comparing the instruction signal with the collected capacitive current signal and the feedforward signal to generate a modulation signal, and comp...

Embodiment 2

[0082] Embodiment 2, the present embodiment is a preferred implementation mode; as figure 1 As shown, an optimal control method for grid-connected inverters based on double-filter grid voltage feedforward, which includes:

[0083] S1: collect the voltage and current at the PCC point and the capacitor current of the LCL filter;

[0084] S2: Extract the phase of the voltage at the PCC point and multiply it with the given grid-connected current value to obtain a given reference signal of the grid-connected current;

[0085] S3: The voltage at the PCC point is output through a power grid voltage feedforward link corrected by a double filter link to output a feedforward signal;

[0086] S4: Comparing the given reference signal with the current at the PCC point to obtain an error signal, and adjusting the error signal through a current regulator to obtain a command signal;

[0087] S5: comparing the instruction signal with the collected capacitive current signal and the feedforwar...

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Abstract

The invention discloses a grid-connected inverter optimization control method based on double-filter power grid voltage feedforward, which includes: collecting the voltage and current at the PCC point and the capacitor current of the LCL filter; extracting the phase of the voltage at the PCC point and comparing it with the The given grid current value is multiplied to obtain a given reference signal of the grid current; the voltage at the PCC point is output through a grid voltage feedforward link corrected by a double filter link to output a feedforward signal; the given reference signal is combined with the given The current at the PCC point is compared to obtain an error signal, and the error signal is adjusted by a current regulator to obtain an instruction signal; the instruction signal is compared with the collected capacitive current signal and the feedforward signal to generate a modulation signal , comparing the modulated signal with a triangular carrier wave to generate a PWM wave; using the PWM signal to control the operation of the grid-connected inverter. It solves the problem that the existing control strategy cannot take into account the amplitude and phase of the output impedance of the grid-connected inverter at the same time.

Description

technical field [0001] The invention relates to the technical field of grid-connected inverters, in particular to a grid-connected inverter optimization control method based on double-filter grid voltage feedforward. Background technique [0002] The renewable energy grid-connected system is a dynamic interactive system formed by grid-connected inverters and weak grids. At present, experts and scholars at home and abroad have carried out extensive research on this dynamic interaction. Aiming at the stability control problem of the grid-connected inverter under the weak grid, in the prior art, the weighted average current control (WACC) reduces the system from the third order to the first order by weighting the inverter side current and the grid-connected current, simplifying The system control is achieved, but the method will lose stability under weak grid. In view of the instability of WACC under weak power grids, some scholars have proposed an additional strategy of addin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCH02J3/38H02J2203/20
Inventor 宫林薛统宇孙鹏菊胡晓锐藉勇亮朱坤龙王晋宇向菲
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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