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Control method of single-phase photovoltaic grid-connected inverter with power quality adjustment function

A technology of power quality adjustment and control method, which is applied in photovoltaic power generation, single grid parallel feeding arrangement, irreversible DC power input conversion into AC power output and other directions, which can solve the problem that single-phase photovoltaic grid-connected inverter cannot take both Reactive power and harmonic compensation and other issues to achieve the effect of improving quality

Active Publication Date: 2014-10-15
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0003] The control methods for single-phase photovoltaic grid-connected inverters in the prior art cannot take into account the compensation of reactive power and harmonics at the same time

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  • Control method of single-phase photovoltaic grid-connected inverter with power quality adjustment function
  • Control method of single-phase photovoltaic grid-connected inverter with power quality adjustment function
  • Control method of single-phase photovoltaic grid-connected inverter with power quality adjustment function

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] For the structure of single-phase photovoltaic inverter grid-connected system, see figure 1 . The DC source is obtained from the photovoltaic array through DC / DC boost. In order to reduce the harmonic content of the grid-connected current and reduce the inductance, the inverter uses LCL filtering. In order to suppress the instability of the LCL filter, this paper uses the filter capacitor C f The upper series damping resistor R d The passive damping method improves system stability.

[0024] For the control model block diagram of the inverter, see figure 2 , in an embodiment of the present invention where the reference current I ref The calculation process is as image 3 shown. Due to the high switching frequency, in this embodiment, the switching frequency is 10kHz, which is much higher than the grid frequency, so the PWM gain link K ...

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Abstract

The invention provides a control method of a single-phase photovoltaic grid-connected inverter with a power quality adjustment function. The control method aims at allowing grid-connected power generation of the inverter to have reactive compensation and harmonic compensation capacity. The control method is characterized by comprising the steps of constructing a two-phase rest frame by utilizing an improved SOGI-QSG (Second-Order Generalized Integrator-Quadrature Signal Generator), quickly detecting a reactive current component and a harmonic current component in a load, synthesizing to-be-compensated reactive current and harmonic current with active current obtained by a photovoltaic array, forming reference current output by the inverter, selecting a recombination current controller combining a quasi-ratio resonance controller PR and a non-ideal resonance controller according to the formed reference current, controlling a fundamental component of current of the load and to-be-compensated harmonic current of the inverter, and then obtaining a control signal of a switching tube of the inverter. Therefore, reactive compensation and harmonic compensation functions are provided during the grid-connected power generation of the single-phase photovoltaic grid-connected inverter.

Description

technical field [0001] The invention relates to a control method for a single-phase photovoltaic grid-connected inverter distributed at the end of a power grid in a power system, in particular to a control method for a single-phase photovoltaic grid-connected inverter with a power quality adjustment function. Background technique [0002] The nonlinear and impact loads in the low-voltage distribution network are increasing day by day, and the harmonic currents and reactive currents generated by them have brought enormous pressure to the power quality of the public power grid. Due to its high cost and single function, the active power filter (APF) is mainly used in the industrial field, and it is rarely used in residential areas with single-phase grids. The grid-connected system of photovoltaic power generation is similar to the structure of APF, so the control method for the photovoltaic power generation system to provide active filtering function while being connected to th...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/01H02J3/18H02M7/48
CPCY02E10/56Y02E40/30Y02E40/40
Inventor 林焱吴丹岳苏绍泽黄道姗杨洪耕张健陈绍君
Owner STATE GRID CORP OF CHINA
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