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An identification method for control parameters of photovoltaic grid-connected inverters

A technology of control parameters and identification methods, applied in the identification field of photovoltaic grid-connected inverter control parameters, can solve the problems of low identification accuracy and low stability of identification results, and achieve the effect of improving efficiency and accuracy and improving accuracy

Inactive Publication Date: 2016-02-10
HOHAI UNIV
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Problems solved by technology

[0022] Due to the cascading between the inner and outer loop PI controllers, the previous method of using an external disturbance to identify all five parameters at the same time will encounter the problem of parameter identifiability, and the identification accuracy is not high, and when the random search optimization algorithm is used, the identification The stability of the results is not high

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  • An identification method for control parameters of photovoltaic grid-connected inverters
  • An identification method for control parameters of photovoltaic grid-connected inverters
  • An identification method for control parameters of photovoltaic grid-connected inverters

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[0049] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0050] Since the grid-connected inverter adopts double closed-loop control, and the inner and outer loop PI controllers are in a cascaded state, the previous method of simply using a grid-connected side voltage drop disturbance or a step disturbance of the control reference value cannot solve the problem that the parameters cannot be uniquely identified. The parameter identification method proposed by the present invention is to apply disturbance on the secondary side mea...

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Abstract

The invention discloses an identification method for control parameters of a photovoltaic grid-connected inverter. According to the identification method, due to the fact that disturbance is applied to a measuring signal used by the input end of a controller of the photovoltaic grid-connected inverter, step-by-step identification of internal and external ring control parameters is achieved, control parameter identifiability which cannot be achieved in the prior art is achieved, and accuracy of parameter identification can be effectively improved; in addition, on the situation that coupling inductance parameters can be directly measured, no optimization algorithms need to be used in the whole parameter identification process, and efficiency and accuracy of parameter identification can be effectively improved.

Description

technical field [0001] The invention relates to a method for identifying control parameters of a photovoltaic grid-connected inverter, belonging to the field of photovoltaic power generation. Background technique [0002] In the field of solar power generation, photovoltaic power generation is currently the main form, and large-capacity photovoltaic power plants are connected to the transmission network as the main form. In the future, distributed photovoltaic power generation will be connected to the distribution network or form a microgrid. There is also huge room for development. [0003] The photovoltaic power generation system is mainly composed of photovoltaic panels and grid-connected inverters. The output voltage of photovoltaic panels is greatly affected by the intensity of light, and it is an unstable direct current. The direct current must be converted into alternating current with stable voltage and frequency through an inverter to realize grid connection. When ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48
CPCY02E10/56
Inventor 金宇清鞠平潘学萍孙黎霞陈谦
Owner HOHAI UNIV
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