Method and system for determining control parameters of photovoltaic grid-connected inverter

A technology for controlling parameters and determining methods, which is applied in photovoltaic power generation, AC network circuits, single-network parallel feeding arrangements, etc., and can solve problems such as time-consuming, labor-intensive, and low work efficiency

Inactive Publication Date: 2015-01-28
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present application provides a method and system for determining the control parameters of photovoltaic grid-connected inverters, which are used to determine the control parameters

Method used

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  • Method and system for determining control parameters of photovoltaic grid-connected inverter
  • Method and system for determining control parameters of photovoltaic grid-connected inverter
  • Method and system for determining control parameters of photovoltaic grid-connected inverter

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Embodiment 1

[0048] figure 1 It is a flow chart of a method for determining control parameters of a photovoltaic grid-connected inverter provided in an embodiment of the present application.

[0049] Such as figure 1 As shown, the method for determining the control parameters of the photovoltaic grid-connected inverter provided in this embodiment includes the following steps:

[0050] S101: Establish a system small-signal model for the photovoltaic grid-connected inverter.

[0051] Taking the current loop control mode of the LCL filter as an example, first determine its simplified circuit model, such as figure 2 shown.

[0052] Among them, L 1 , L 2 、C f Respectively, the filter inductance and filter capacitor of the LCL filter, R c is the resistor in series with the filter capacitor, u c is the voltage across the filter capacitor, u, u 0 , u e are the voltages of the corresponding nodes in the figure, i 1 to flow through L 1 current, i 2 is the current injected into the busb...

Embodiment 2

[0091] Figure 8 A structural diagram of a system for determining control parameters of a photovoltaic grid-connected inverter provided in an embodiment of the present application.

[0092] Such as Figure 8 As shown, the system for determining control parameters of a photovoltaic grid-connected inverter provided in this embodiment includes a modeling module 10 , a drawing module 20 and a selection module 30 .

[0093] The modeling module 10 is used to establish a system small-signal model for the photovoltaic grid-connected inverter, which includes a first modeling unit (not shown) and a second modeling unit (not shown).

[0094] Taking the current loop control mode of the LCL filter as an example, the first modeling unit is used to first determine its simplified circuit model, such as figure 2 shown.

[0095] Among them, L 1 , L 2 、C C Respectively, the filter inductance and filter capacitor of the LCL filter, R e is the resistor in series with the filter capacitor, ...

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Abstract

The invention provides a method and system for determining control parameters of a photovoltaic grid-connected inverter. According to the method and system, firstly, a system small-signal model is established for the photovoltaic grid-connected inverter; then, a root locus diagram of the system small-signal model is drawn; finally, according to the root locus diagram, a group of parameter values capable of enabling main system characteristic values to be away from an imaginary axis are selected as the control parameters. Due to the fact that according to the method and system, the control parameters are directly selected through a root locus method without repeated tests, the problems that repeated tests are needed in an existing method for determining the control parameters, time and labor are saved, and work efficiency is low can be solved.

Description

technical field [0001] The present application relates to the technical field of automatic control, and more specifically, to a method and system for determining control parameters of a photovoltaic grid-connected inverter. Background technique [0002] The photovoltaic grid-connected inverter is used to convert the direct current generated by photovoltaic cells into alternating current, and then input it into the grid. During this process, the intensity of light received by the photovoltaic cell will continue to change with changes in the natural environment (weather changes, cloud movement, etc.), so the output power of the grid-connected inverter will also change accordingly. The output power of the inverter is controlled by the control loop. There are multiple proportional-integral controllers in the control loop. The control parameters of the proportional-integral controller determine the control effect of the entire control loop. If the control parameters are not desig...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/383Y02E10/56
Inventor 赵波周丹杨野清张雪松
Owner STATE GRID CORP OF CHINA
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