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Isolation method and system based on MGP grid-connected harmonic waves of new energy power grid

A new energy and power grid technology, applied to the AC network to reduce harmonics/ripples, harmonic reduction devices, single-network parallel feeding arrangements, etc., can solve the problem of reducing the proportion of synchronous generators, crisis grid frequency stability, non Problems such as lack of linearity and inertia to achieve the effect of improving stability

Inactive Publication Date: 2020-05-15
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] New energy power generation is generally connected to the grid through power electronic converters. Compared with traditional grid-connected methods (such as thermal power units), this method has the characteristics of fast and flexible control, but it also has the defects of nonlinearity and insufficient inertia. With the continuous penetration of new energy power generation, a large number of grid-connected power electronic inverters will appear in the grid
On the contrary, the proportion of traditional synchronous generators will be reduced, thereby reducing the rotating reserve capacity and moment of inertia of the power grid, and then endangering the frequency stability of the power grid. The SSO problem caused by the harmonics of the new energy grid in my country is prominent, and the MGP system can provide inertia for new energy Support and enhance the frequency stability of the new energy grid

Method used

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  • Isolation method and system based on MGP grid-connected harmonic waves of new energy power grid
  • Isolation method and system based on MGP grid-connected harmonic waves of new energy power grid
  • Isolation method and system based on MGP grid-connected harmonic waves of new energy power grid

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Experimental program
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Effect test

Embodiment 1

[0041] refer to image 3 , the MGP harmonic isolation test platform is composed of frequency converter, PLC control system, power transmitter, MGP system and power grid. Harmonics are injected into the new energy side, and the harmonic content on both sides of the MGP system is measured to study the MGP system. For the isolation of harmonics on the new energy side, the inverter simulates the new energy to drive the MGP, and the generator side is connected to the grid. Under different working conditions, measure the voltage harmonic content of measuring point 1 and measuring point 2 to obtain the MGP’s effect on the harmonics. Decay effect.

[0042] refer to Figure 1 to Figure 6 , which is the first embodiment of the present invention, this embodiment provides a method for isolating harmonics based on new energy grid MGP grid connection, including:

[0043] S1: Connect the frequency converter to the power feedback control device, start the frequency converter, and drive the ...

Embodiment 2

[0088] refer to Figure 11 and Figure 12, which is the second embodiment of the present invention, the method of the present invention realizes the control of transmission active power by controlling the power angle of the MGP (i.e. the voltage phase difference on both sides of the MGP), referring to the voltage at the grid-connected side of the MGP, and collecting the measured voltage and current of the generator Calculate the active power, if the actual active power transmitted is greater than the target power, reduce the frequency of the inverter output voltage, thereby reducing the active power transmitted by the MGP; if the active power is less than the target power, increase the output voltage of the inverter to increase the phase difference, Thereby increasing the active power of MGP. The difference between the actual active power transmitted by the MGP and the target power is used as the input of the PI controller, and the frequency adjustment of the output voltage o...

Embodiment 3

[0095] refer to Figure 16 , is the third embodiment of the present invention. This embodiment is different from the above two embodiments in that it provides an isolation system based on new energy grid MGP grid-connected harmonics, including:

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Abstract

The invention discloses an isolation method and system based on MGP grid-connected harmonic waves of a new energy power grid, and the method comprises the steps: connecting a frequency converter intoa power feedback control device, starting the frequency converter, and driving an MGP to operate at a synchronous rotating speed; detecting voltages on two sides of grid connection, closing the gridconnection switch after a grid connection condition is met, and enabling the MGP to operate in a grid connection manner; respectively measuring voltage waveforms of the measuring point 1 and the measuring point 2 under different working conditions and storing measurement result data; and performing Fourier transform on the measuring point 1 and the measuring point 2 by using the different workingconditions, obtaining spectrogram data by combining a 50HZ fundamental wave amplitude, and analyzing the isolation effect of the MGP on harmonic waves according to the measurement result data and thespectrogram data. The new energy power grid harmonic waves are isolated through the MGP system, the power feedback control system and the voltage feedback control system, the MGP system can isolate the generated harmonic waves under different working conditions, the harmonic waves are attenuated, and the operation stability of the new energy power grid is improved.

Description

technical field [0001] The present invention relates to the technical field of new energy grid and MGP grid connection, in particular to a method and system for isolating harmonics based on new energy grid MGP grid connection. Background technique [0002] In order to protect the global environment, reduce the proportion of fossil energy, use new energy to generate electricity to replace traditional thermal power plants, and increase the proportion of new energy is an important means. The new energy power system with high penetration rate is the general trend of the future power system development. [0003] New energy power generation is generally connected to the grid through power electronic converters. Compared with traditional grid-connected methods (such as thermal power units), this method has the characteristics of fast and flexible control, but it also has the defects of nonlinearity and insufficient inertia. With the continuous penetration of new energy power genera...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/38
CPCH02J3/01Y02E40/40
Inventor 陈巨龙刘振铭孙斌薛毅李庆生张裕何向刚罗宁王健赵庆明张方银邓朴罗文雲
Owner GUIZHOU POWER GRID CO LTD
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