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Method for controlling grid-connected inverter with anti-load disturbance function

A control method and inverter technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of increasing system cost and not considering the impact, and achieve the effect of saving system cost, simplifying design, and realizing damping effect.

Inactive Publication Date: 2013-12-25
ZHEJIANG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, this method changes the filter structure of the inverter, and an additional current sensor is required to detect the current between the two capacitors, which will undoubtedly increase the cost of the system; in addition, this method does not consider the influence of the local load on the grid side current. influences

Method used

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  • Method for controlling grid-connected inverter with anti-load disturbance function
  • Method for controlling grid-connected inverter with anti-load disturbance function
  • Method for controlling grid-connected inverter with anti-load disturbance function

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Embodiment Construction

[0026] In order to describe the present invention more specifically, the control method of the grid-connected inverter of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] Such as figure 2 As shown, a control method of a grid-connected inverter with anti-load disturbance includes the following steps:

[0028] (1) Acquisition of grid voltage v g and grid side current;

[0029] In this embodiment, the grid-connected inverter converts 450V direct current into 220V alternating current, which is filtered by an LCL filter and then input to the grid.

[0030] The grid-connected inverter is a 5kW single-phase voltage source inverter VSI, which has 4 IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), and the switching frequency of the IGBT is 8.4kHz.

[0031] The LCL filter includes the inverter side inductance L 1 , capacitor C and grid side inductance L 2 ; L 1 =1....

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Abstract

The invention discloses a method for controlling a grid-connected inverter with an anti-load disturbance function. The method comprises the following steps of: (1) acquiring a grid voltage and a grid side current; (2) according to the grid side current, generating an instruction signal; (3) according to the grid voltage and the grid side current, acquiring a feed-forward signal; and (4) superposing the instruction signal and the feed-forward signal to obtain a modulation signal, and generating a switching signal for controlling the grid-connected inverter according to the modulation signal. Compared with the prior art, the method has the advantages that: feed-forward quantity is calculated by using a feed-forward signal estimator according to the grid voltage and the grid side current, a sensor which is required for detecting a capacitance current of a filter is eliminated, and system cost is saved; and under the condition that the grid-connected inverter has a local load, the grid side current cannot be influenced by load disturbance, so that a third-order system is reduced to a first-order system, a damping effect on the system is achieved, and the design process of a current regulator is simplified.

Description

technical field [0001] The invention belongs to the technical field of power inverter control, and in particular relates to a control method of a grid-connected inverter with load disturbance resistance. Background technique [0002] With the increasingly severe energy and environmental problems, the development and utilization of renewable energy (such as solar energy, wind energy, etc.) has become an urgent need for human society. Grid-connected inverter, as a necessary interface device connecting renewable energy power generation system and grid, directly affects the performance of the entire grid-connected power generation system, so it has become a research hotspot in the field of power electronics. [0003] figure 1 Shown is a typical photovoltaic power generation system structure, which is mainly composed of photovoltaic cell arrays, grid-connected inverters, AC filters, local loads, etc. Its working principle is: the direct current generated by the photovoltaic cel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
Inventor 白志红马皓
Owner ZHEJIANG UNIV
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