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Current control method of photovoltaic grid-connected inverter with APF function

A current control and inverter technology, applied in photovoltaic power generation, AC network circuits, irreversible DC power input conversion to AC power output, etc., can solve the problem of insufficient control accuracy, poor robustness, and difficulty in grid connection Current and other issues, to achieve the effect of improving power quality, good dynamic performance, and reducing adverse effects

Inactive Publication Date: 2017-12-15
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional PI control algorithm has insufficient control precision and poor robustness, and it is difficult to meet the national standard that the grid-connected current distortion rate is less than 5%.

Method used

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  • Current control method of photovoltaic grid-connected inverter with APF function
  • Current control method of photovoltaic grid-connected inverter with APF function
  • Current control method of photovoltaic grid-connected inverter with APF function

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Embodiment Construction

[0060] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0061] Such as figure 1 As shown, a current control method of a photovoltaic grid-connected inverter with APF function includes the following steps:

[0062] Step 1. Establish the mathematical model of the photovoltaic grid-connected inverter with APF function, and derive the APF dynamic model according to the mathematical model.

[0063] The equivalent model of photovoltaic grid-connected inverter with APF function is as follows: figure 2 As shown, it can be seen from the circuit principle that

[0064]

[0065] Among them, U 1 , U 2 and U 3 is the nonlinear load side voltage, L c is the inductance value, R c is the resistance value, i 1 i 2 and i 3 are respectively the currents ...

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Abstract

The invention discloses a current control method of a photovoltaic grid-connected inverter with the APF function. An inverse method is applied to a design of a current tracking control system; an instruction filter is introduced to deal with a problem of inverting input saturation; an instruction filter compensation signal is designed to reduce adverse effects caused by the instruction filter; and the stability and onvergence of the whole system are proved by the asymptotically stable Lyapunov theorem. Compared with the traditional APF, the control method enables the current tracking to be improved and the energy quality to be improved. Compared with the traditional PI algorithm, the method disclosed by the invention has the good dynamic performance and high robustness.

Description

technical field [0001] The invention relates to a current control method of a photovoltaic grid-connected inverter with an APF function, and belongs to the field of power quality management of a power grid. Background technique [0002] There are many similarities in the topology and control methods of the photovoltaic grid-connected system and the active filter. To study the unified control of the two, combine the grid-connected power generation function of the photovoltaic grid-connected system with the harmonic compensation function of the APF, It has dual functions of photovoltaic grid-connected power generation and harmonic compensation. Thereby improving the power quality of the power grid, saving the investment cost of phase equipment, and improving the utilization rate of photovoltaic grid-connected system devices. [0003] APF is a new type of power electronic device for dynamic compensation of harmonic and reactive power. Its basic principle is to detect the harmo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02J3/01H02J3/18
CPCH02J3/01H02J3/1842H02M7/48Y02E10/56Y02E40/20
Inventor 史明明袁晓冬葛乐陈兵崔林罗珊珊张宸宇费骏韬
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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