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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

Active Publication Date: 2016-08-24
JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Therefore, the technical problem to be solved by the embodiments of the present invention is that the existing technology cannot effectively suppress the common mode current of the photovoltaic grid-connected inverter

Method used

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  • Model direct power forecast control method, device and system
  • Model direct power forecast control method, device and system

Examples

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Embodiment 1

[0053] This embodiment provides a model direct power predictive control method, which can be used in a single-phase photovoltaic grid-connected inverter power generation system, such as figure 1 As shown, the method includes the following steps:

[0054] S1. Obtain the output voltage u of the single-phase photovoltaic grid-connected inverter out , common mode voltage u cm The corresponding relationship between each group of switch state combinations, the switch state combination represents the combination of the on / off state of the power switch tube of the single-phase photovoltaic grid-connected inverter;

[0055] S2. Calculate the value of the objective function g(k+1) of the model direct power predictive control corresponding to each group of switch state combinations,

[0056] g(k+1)=|P ref (k+1)-P(k+1)|+λ Q |Q ref (k+1)-Q(k+1)|+λ cm | u cm -V dc / 2|, where λ Q is the reactive power weight coefficient, λ cm is the common-mode voltage weighting coefficient, V dc ...

Embodiment 2

[0112] Corresponding to Embodiment 1, this embodiment provides a model direct power predictive control device, such as image 3 shown, including:

[0113] Acquisition unit 1, used to obtain the output voltage u of the single-phase photovoltaic grid-connected inverter out , common mode voltage u cm The corresponding relationship between each group of switch state combinations, the switch state combination represents the combination of the on / off state of the power switch tube of the single-phase photovoltaic grid-connected inverter;

[0114] The first calculation unit 2 is used to calculate the value of the objective function g(k+1) of the model direct power predictive control corresponding to each group of switch state combinations,

[0115] g(k+1)=|P ref (k+1)-P(k+1)|+λ Q |Q ref (k+1)-Q(k+1)|+λ cm | u cm -V dc / 2|, where λ Q is the reactive power weight coefficient, λ cm is the common-mode voltage weighting coefficient, V dc is the DC bus voltage, P(k+1) and Q(k+1)...

Embodiment 3

[0127] This embodiment provides a model direct power predictive control system, such as Figure 4 As shown, it includes a photovoltaic array 10, a single-phase photovoltaic grid-connected inverter 20, an LC filter 30, a power grid 40 and a model direct power predictive control device 50 of Embodiment 2;

[0128] The photovoltaic array 10 , the single-phase photovoltaic grid-connected inverter 20 , the LC filter 30 and the grid 40 are connected sequentially, and the model direct power predictive control device 50 is respectively connected to the single-phase photovoltaic grid-connected inverter 20 and the grid 40 .

[0129] The above model direct power predictive control system, by defining the objective function of the model direct power predictive control on the active power and reactive power of the single-phase photovoltaic grid-connected inverter, can predict the minimum objective function value according to the limited combination of switch states, Combining the advantage...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38
CPCH02J3/383H02M7/5387H02M1/123Y02E10/56
Inventor 黄敏杨勇方刚卢进军刘滔蒋峰曾维波
Owner JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO LTD
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