Model direct power forecast control method, device and system

A power prediction and control method technology, applied in the direction of output power conversion device, circuit device, AC power input conversion to DC power output, etc., can solve the problem that the common mode current of photovoltaic grid-connected inverter cannot be effectively suppressed, and achieve Effects of low common mode current, suppression of common mode current, and flexible control
CN105897029AActive Publication Date: 2016-08-24JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO LTD
Publication Date
2016-08-24

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Abstract

The invention discloses a model direct power forecast control method, device and system, and belongs to the technical field of photovoltaic power generation conversion control. The method comprises the following steps of acquiring an output voltage u<out> of a single-phase photovoltaic grid-connected inverter, a common-mode voltage u<cm> and a corresponding relation of each group of on-off state combinations; calculating a value of a target function g(k+1) of model direct power forecast control corresponding to each group of on-off state combinations; calculating the minimum value g<op>(k+1) in the target functions g(k+1); and acquiring the on-off state combination corresponding to the minimum g<op>(k+1), and achieving low common-mode model direct power forecast control of the single-phase photovoltaic grid-connected inverter. By the method, the active power and the reactive power of the inverter can be flexibly controlled, moreover, high static and dynamic performance is achieved, and the common-mode current of the single-phase photovoltaic grid-connected inverter can be effectively inhibited.
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Description

technical field

[0001] The invention relates to the technical field of photovoltaic power generation conversion control technology, in particular to a model direct power predictive control method, device and system. Background technique

[0002] In recent years, renewable energy sources such as solar energy, wind energy, and bioenergy have been paid more and more attention by governments of various countries and developed rapidly. As a renewable energy source with great potential, solar energy has been widely used in recent years.

[0003] Photovoltaic grid-connected inverter, as the bridge connecting the distributed generation system and the grid, is the core of the distributed generation system. The performance of photovoltaic grid-connected inverter directly affects the performance of the entire distributed generation system. For the control of single-phase photovoltaic grid-connected inverters, there are currently quasi-resonant control in the stationary coordinate sys...

Claims

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