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Device and method for reactive power compensation and harmonic suppression of grid-connected potovoltaic system

A photovoltaic and harmonious technology, applied in the direction of reactive power compensation, harmonic reduction device, reactive power adjustment/elimination/compensation, etc., can solve the problem of not being equal, and achieve the effects of real-time detection and control, fast current response, and simple structure

Active Publication Date: 2011-05-25
YINGLI ENERGY CHINA
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Problems solved by technology

[0007] The neuron-based adaptive harmonic current detection method is adopted. Although the circuit structure is simple, the dynamic response speed is fast, and the detection accuracy is high, it is not a conventional method, and further research is needed for practical applications.

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Embodiment Construction

[0052] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the environment-photovoltaic grid-connected system to which the technical solution of the present invention is applied is introduced below, see figure 1 , which is a structural diagram of a photovoltaic grid-connected system in the prior art.

[0053] The direct current generated by the photovoltaic cell 101 is converted into an adjustable direct current voltage by the step-up unit 102, and the direct current voltage enters the inverter unit 104 after being limited by the current limiting unit 103, and the inverter unit 104 inverts the direct current voltage into an alternating current voltage, the AC voltage passes through the filter isolation unit 105 to complete the grid connection function, and provides AC power for the load circuit 106 at the same time.

[0054] The filter isolation unit 105 in the photovoltaic grid-connected system of the...

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Abstract

The invention discloses a device and a method for reactive power compensation and harmonic suppression of a grid-connected potovoltaic system. The method comprises the following steps of: directly acquiring current on a harmonic source, decomposing the acquired current into harmonic current, fundamental current, reactive current and active current through Fourier transformation, doing a summation on the harmonic current requiring compensation and the reactive current to obtain compensating current, comparing the compensating current with command current, utilizing PWM (pulse width modulation) tracking control method to output PWM waveforms according to the comparison results and driving the PWM waveforms to first control the state of every switching tube in an inversion unit and then control the current output by the inversion unit. Therefore, current on a load can track the command current in a sawtooth wave form, the harmonic current and the reactive current can be offset and the purposes of harmonic suppression and reactive power compensation are achieved. The device and the method can be realized on the basis of the traditional grid-connected potovoltaic system, and the device has a simple structure, carries out detection and control in a real-time manner and has fast responding current.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a device and method for reactive power compensation and harmonic suppression of a photovoltaic grid-connected system. Background technique [0002] With the increasingly prominent problem of energy shortage in the world, the utilization of renewable energy, especially the comprehensive utilization of solar photovoltaic power generation has attracted extensive attention. [0003] The existing grid-connected photovoltaic power generation technology only provides active power to the grid, that is, it inverts the DC power of the solar photovoltaic array into AC power and feeds it to the grid, and ensures that it has a high power factor. The reactive power of the load is generally provided by the grid. With the popularization and application of photovoltaic power generation technology, the realization of reactive power compensation and harmonic suppression techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/01
CPCY02E40/30Y02E10/563Y02E10/56Y02E40/40
Inventor 王士元宋登元甄云云陈敬欣王占友
Owner YINGLI ENERGY CHINA
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