A nonlinear adaptive pq control method for inverters in grid-connected state

A control method and inverter technology, applied in the direction of single-network parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve the problems of inconvenient use of PQ double-loop control

Active Publication Date: 2019-09-20
ZHEJIANG UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many parameters need to be adjusted and the parameters affect each other, which makes the traditional PQ double-loop control very inconvenient to use

Method used

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  • A nonlinear adaptive pq control method for inverters in grid-connected state
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  • A nonlinear adaptive pq control method for inverters in grid-connected state

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Embodiment Construction

[0051] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0052] like figure 1 As shown, in the main circuit of the inverter, DC is a direct current power supply, and C 1 is the large capacitor at the DC side of the inverter, L 1 , R 1 are the inductance and resistance of the inverter side of the LCL filter, C, R 3 is the filter capacitor and series resistor, L 2 , R 2 is the inductance and resistance of the grid side of the LCL filter, Breaker is the switch at the common connection point between the inverter and the grid, Grid is equivalent to the large grid, v abc is the load terminal voltage, i abc to flow through L 2 The current, the PWM signal input by the inverter composed of insulated gate bipolar transistors (IGBT) is the control signal from the control circuit to the inverter. When the circuit breaker Breaker is closed, the inverter works in grid-connected state.

[0053] like figure 2 As shown, the contr...

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Abstract

The invention discloses a nonlinear adaptive PQ control method of an inverter in a grid-connected state, comprising the following steps: (1) collecting the three-phase output voltage vabc and the output current iabc of the LCL output port; (2) according to the output voltage and current obtained in the step (1) to calculate the active power P and reactive power Q output from the inverter; (3) calculating the d-axis component v<*>[d] of the modulation voltage; (4) calculating the q-axis component v<*>[q] of the modulation voltage; (5) adjusting the parameters in the step (3) and the step (4) through the adaptive control scale function; and (6) subjecting the v<*>[d] and v<*>[q] obtained in the step (3) to dq0 / abc transform to generate a PWM modulation wave, wherein the PWM modulation wave is input to the PWM wave generator to generate the PWM control signal for controlling the inverter. The method of the present invention not only does not require complex multi-parameter tuning, but also can set the control accuracy and is simple and efficient.

Description

technical field [0001] The invention relates to the technical field of three-phase inverter power control, in particular to a nonlinear self-adaptive PQ control method of an inverter in a grid-connected state. Background technique [0002] With the development of the economy, people's demand for energy continues to grow, and the shortage of fossil energy makes countries pay more and more attention to the development and utilization of new energy. Today's distributed new energy is mostly connected to the traditional large power grid in the form of a microgrid, and the microgrid works in a grid-connected state most of the time. During grid-connected operation, distributed power generally works in constant power mode. [0003] In the prior art, the control method adopts PQ double-loop control, and the quality of the control effect greatly depends on the selection of LCL filter parameters and double-loop PI parameters. There are many parameters that need to be adjusted and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24
Inventor 项基杨振铨余杰顾一丰沈祥朱亚萍钱一宏朱权
Owner ZHEJIANG UNIV
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