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Method for synchronizing distributed power supply and power grid

A distributed power supply and power grid technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve problems such as over-current faults, large harmonics, etc., achieve good real-time tracking, avoid over-current faults, and have good dynamic and static characteristics.

Active Publication Date: 2013-04-24
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0003] In order to solve the problem in the prior art that the harmonics are too large when the distributed power grid is integrated into the power grid, causing overcurrent faults, the present invention provides a method for seamless grid connection that can suppress frequent jumps and oscillations caused by glitches

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  • Method for synchronizing distributed power supply and power grid
  • Method for synchronizing distributed power supply and power grid
  • Method for synchronizing distributed power supply and power grid

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Embodiment Construction

[0025] The present invention mainly includes the detection of grid voltage, the detection of the output voltage of the grid-connected inverter 2, the detection of the output current of the grid-connected inverter 2, the dq conversion of the grid voltage and the output voltage of the grid-connected inverter, and the grid-connected inverter The dq transformation of the output current, and the grid phase angle θ obtained through a phase locked loop (PLL), when there is no grid connection, it is determined by detecting the deviation of the grid voltage and the dq transformation of the grid-connected inverter output voltage Whether the grid connection conditions are met, and the dq reference value of the current loop is set to 0 at the same time, so as to avoid over-current faults and realize the accurate, safe and fast grid connection of distributed power sources.

[0026] This method first obtains the output voltage value of the distributed power source 1 and the grid, such as figure...

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Abstract

The invention discloses a method for synchronizing a distributed power supply and a power grid and particularly relates to a method for solving voltage fluctuation in the connection of the distributed power supply to the power grid. In the method, a detection module contrasts the voltages of the distributed power supply and the power grid, the power grid is connected to if the voltage difference is within an error range, and the value of the voltage value needed to be regulated is calculated, the output of a grid-connected inverter is regulated and the distributed power supply can be connected to the power grid if the voltage difference is beyond the error range. The method realizes the seamless combination of a distributed power supply system and the power grid and the quick and accuratedetection of the frequencies, amplitudes and phases of the voltages of the distributed power supply system and the power grid, and when a grid connection condition is met, accurately sends a grid connection signal to realize seamless and quick grid connection. The alternating current of the grid-connected inverter is used as a grid connection feedback signal and the output current of the grid-connected inverter is made as close to zero as possible to prevent overcurrent faults from appearing before grid connection, so equipment is protected.

Description

Technical field [0001] The invention relates to a power system adjustment method, in particular to a method for solving voltage fluctuations when distributed power sources are integrated into a power grid. Background technique [0002] With the development of renewable energy sources such as photovoltaic / wind power generation, distributed power sources are increasingly widely used; the role of distributed power sources is to convert solar energy, wind energy, chemical energy, etc. into electrical energy, and the electrical energy obtained after conversion of different energy sources The forms are different; for example, the electrical energy obtained by photovoltaic power generation, fuel cell and other systems through energy conversion is in the form of direct current, while the electrical energy obtained by systems such as wind power generation and micro gas turbines is in the form of alternating current. The grid-connected inverter is an important part of the distributed power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/40
Inventor 侯朝勇胡学浩惠东
Owner CHINA ELECTRIC POWER RES INST
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