Three-phase photovoltaic grid-connected inverting control method

A control method and photovoltaic technology, applied in the field of solar photovoltaic power generation, can solve problems such as low efficiency, easy oscillation, slow system response speed, etc.

Inactive Publication Date: 2012-10-24
天威新能源系统工程(北京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The current existing technology uses the current command and the actual current error to adjust and control through PID, which has the defects of slow system response, static error, low tracking accuracy, and low efficiency; moreover, it is prone to oscillation when the light changes , poor reliability

Method used

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  • Three-phase photovoltaic grid-connected inverting control method
  • Three-phase photovoltaic grid-connected inverting control method
  • Three-phase photovoltaic grid-connected inverting control method

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Embodiment Construction

[0052] Its specific method and device structure are illustrated as follows by way of example:

[0053] Such as figure 1 , is the structure of the inverter of the present invention: including an air circuit breaker QK connected to the power grid in sequence, a three-phase isolation transformer T, a three-phase high-frequency filter reactor L, a three-phase IGBT bridge arm, a DC capacitor, an anti-reverse diode, a photovoltaic Panel components PV etc. One end of the isolation transformer T is connected to the power grid, and the other end is connected to the dry-type reactor; the other end of the dry-type reactor is connected to the midpoint of the bridge arm of the IGBT insulated gate transistor; the positive end of the IGBT bridge arm is connected to the positive end of the DC capacitor C to prevent The cathode of the reverse diode D is connected to the positive terminal of the DC capacitor C, the anode of the reverse diode D is connected to the positive terminal of the photo...

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Abstract

The invention aims at providing a three-phase photovoltaic grid-connected inverting control method and a device thereof, relating to the technical field of solar energy power generating. The method and device gather secondary side line voltages u<ab>, u<bc> and u<ca>, and currents i, i and i<c> of a grid-connected isolation transformer, DC voltage Ud and current i<dc> of a panel; magnitude of grid-connected command current is obtained according to maximum power point tracking (MPPT); switching time is calculated by adopting deadbeat predictive current control strategy; on and off of a main circuit switch element are controlled by a controller according to the calculated time, thereby realizing control of grid-connected current. The invention can ensure system current to track the variation of the command current in a control cycle (us level), realize controllable power factor, low harmonic grid-connected current and steady and astatic system and has the characteristics of fast response speed, high tracking accuracy and efficiency, good reliability, etc.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic power generation. Background technique [0002] The three-phase photovoltaic grid-connected inverter inverts the DC power generated by the photovoltaic cells into AC power with the same frequency as the grid, and sends the power to the grid through the power distribution system. Grid-connected photovoltaic system is the development direction of photovoltaic power station. Compared with isolated solar photovoltaic power station, it has the following advantages: ① Photovoltaic cells can always operate at the maximum power point, and the grid absorbs all the electric energy generated by the solar power station, improving The power generation efficiency of the solar power station is improved; ② The battery is omitted as an energy storage link, which reduces the system cost; ③ The energy loss in the charging and discharging process of the battery is saved, and the system efficiency is improv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02N6/00H02J3/01H02J3/18
CPCY02E10/563Y02E40/30Y02E10/56Y02E40/40
Inventor 张喜军任晓鹏穆桂霞焦翠坪赵志强王保利
Owner 天威新能源系统工程(北京)有限公司
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