Method for detecting synchronization of distributed power supply and power grid

A technology of distributed power supply and power grid, which is applied in the parallel feeding arrangement of a single network and the use of digital measurement technology for measurement, etc., can solve problems such as excessive harmonics, improve reliability and stability, suppress frequent jumps and The effect of shock, seamless and fast grid connection

Inactive Publication Date: 2013-11-27
TELLHOW SCI TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grid-connected operation of distributed power sources can improve the reliability of power supply for users, alleviate local congestion of the power grid, reduce network loss and solve power consumption problems in marginal areas. Problems causing overcurrent faults

Method used

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  • Method for detecting synchronization of distributed power supply and power grid
  • Method for detecting synchronization of distributed power supply and power grid

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Embodiment Construction

[0009] like figure 1 As shown, the present invention is implemented in this way. On the basis of the distributed power supply 1, the grid-connected inverter 2, the output filter 3, the isolation transformer 4 and the static switch 5 being connected in series in sequence, the distributed power supply 1 is connected by the grid-connected inverter Converter 2 is reversed into AC, and after output filter 3, feeds into the grid by static switch 5 through isolation transformer 4, it is characterized in that said method is to connect detection module 6 between grid-connected inverter 2 and grid, The detection module 6 also controls the static switch 5, and uses the detection module 6 to compare the voltage difference between the distributed power supply 1 and the grid. If it is within the error range, the detection module 6 controls the static switch 5 to connect to the grid. If it is outside the error range, calculate Determine the magnitude of the voltage value that needs to be adj...

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Abstract

A method for detecting synchronization of a distributed power supply and a power grid aims to solve the problems that harmonic waves are too large and overcurrent faults are caused when the distributed power supply merges into the power grid in the prior art. The method for detecting the synchronization of the distributed power supply and the power grid comprises the connected distributed power supply, a grid connected inverter, an output filter, an isolation transformer and a static switch, and the distributed power supply is reversed into alternating currents through the grid connected inverter and is feed into the power grid through the isolation transformer and the output filter from the static switch. The method is characterized in that a detecting module is connected between the grid connected inverter and the power grid. The detecting module is used for comparing the voltage difference between the distributed power supply and the power grid, if the voltage difference is within an error range, the power grid is connected, if the voltage difference is out of the error range, the voltage value need to be regulated is calculated, and the output value of the grid connected inverter is adjusted to enable the distributed power supply to be capable of being merged into the power grid. The grid-connected operation of the distributed power supply can improve the service reliability of power supply for users, relieve partial congestion of the power grid, reduce grid loss and solve power utilization problems in marginal areas.

Description

technical field [0001] The invention relates to a method for detecting the synchronization between a distributed power supply and a power grid. Background technique [0002] After China's "Renewable Energy Law" was promulgated and implemented, relevant national policies such as price, taxation, mandatory market quota and grid-connected access have been introduced one after another. Renewable distributed power sources such as small hydropower, wind power, and solar energy have entered an unprecedented stage. period of accelerated development. Different from conventional power sources (thermal power, nuclear power and large-scale hydropower), distributed power sources are small, distributed and diversified, and generally have a small capacity (tens of kW to 50 MW, close to end users), so as to be isolated or connected to the distribution network The grid-connected mode operates at the distribution voltage level. The grid-connected operation of distributed power sources can i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38G01R19/25
Inventor 郑琦
Owner TELLHOW SCI TECH CO LTD
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