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Photovoltaic virtual synchrony control method of inverter based on master-slave control

A control method and virtual synchronization technology, applied in photovoltaic power generation, AC network circuits, electrical components, etc., can solve problems such as inability to adjust frequency

Active Publication Date: 2018-10-09
HEFEI UNIV OF TECH
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Problems solved by technology

[0009] The object of the present invention is that the photovoltaic virtual synchronous control method based on Lagrangian interpolation prediction needs to test the maximum power point offline, and a single photovoltaic virtual synchronous machine without energy storage needs to perform maximum power tracking at intervals to refresh the standby power point and frequency modulation coefficient. For the problem of not being able to adjust the frequency during this period, a virtual synchronization control method for photovoltaic inverters based on master-slave control is provided. This method is aimed at existing photovoltaic power stations with strong communication connections, and improves some photovoltaic inverters in photovoltaic power stations. The entire photovoltaic power station has the function of frequency regulation and voltage regulation

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Embodiment Construction

[0092] The present embodiment will be specifically described below in conjunction with the accompanying drawings.

[0093] figure 1 It is a grid-connected structural diagram of a photovoltaic power station according to an embodiment of the present invention. The specific parameters of all inverters are as follows: rated output line voltage is 380V / 50Hz, DC side filter capacitor C in =15mF, filter inductance L on bridge arm side f =0.06mH, AC measurement filter capacitance C f =300uF, the filter inductance value of the grid side is L g =0.02mH, the rated capacity of the inverter is 500KVA. The impedance of each inverter connected to the grid is Z L =0.001+j0.001Ω. In this embodiment, m=1, i=1.

[0094] figure 2 It is a block diagram of the slave inverter control structure according to the embodiment of the present invention. The steps of control method of the present invention are as follows:

[0095] A virtual synchronous control method for photovoltaic inverters ba...

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Abstract

The invention discloses a photovoltaic virtual synchrony control method of an inverter based on master-slave control. In the method, a photovoltaic inverter of a photovoltaic power station is set on the master-slave control mode; the master inverter executes a maximum power tracking control method; a slave inverter executes a photovoltaic virtual synchrony control method; and, the power and the voltage when the master inverter acquires the maximum power point are sent to the slave inverter through communication, so that the slave inverter adjusts the step size of tracking and the parameter offrequency modulation. The method provided by the invention improves the prior photovoltaic virtual synchrony control method, so that the slave inverter is always in the state of frequency modulation;and thus, the frequency of the power grid can be better adjusted.

Description

technical field [0001] The invention belongs to the field of grid-connected control of photovoltaic inverters, and in particular relates to a photovoltaic virtual synchronous control method for inverters based on master-slave control. Background technique [0002] With the gradual maturity of distributed power generation technology, new energy generation applications such as photovoltaics and wind power are becoming more and more widely used. However, distributed power generation systems are connected to the grid through power electronic devices such as inverters. Although the transient response speed is fast, the It does not have inertia, nor can it support a frequency regulation of the power grid. When large-scale new energy is connected to the grid, the penetration rate of the power grid continues to increase, and the installed capacity of traditional synchronous generators continues to decline, which leads to the reduction of the power system's rotational inertia and sys...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/42
CPCH02J3/385H02J3/42Y02E10/56
Inventor 张兴张海峥李明刘芳刘晓玺陈巧地
Owner HEFEI UNIV OF TECH
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