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Electric energy quality evaluation method and system for new energy field station converter device

A converter device and power quality technology, which is applied in the field of power quality evaluation of converter devices in new energy stations, can solve problems such as inability to adjust harmonics, complex harmonic generation mechanism, and reduced accuracy of power quality evaluation, so as to achieve harmonic wave adjustment, accurate harmonic adjustment, and the effect of optimal power output

Inactive Publication Date: 2021-02-12
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The inventors of the present disclosure found that the harmonic generation mechanism of existing power electronic devices is complicated, and the simple equivalent superposition of harmonic sources cannot meet the research requirements of harmonic characteristics of new energy power generation systems; the output of existing inverter devices There are many sources of harmonic components in power, and there are few studies on the direct sources of harmonic influence, so it is impossible to achieve a better evaluation of the power quality of the inverter device; the existing harmonic analysis lacks the power generation unit The research on the harmonic generation mechanism cannot effectively evaluate the harmonic changes brought about by the output factors of the power generation unit and the filter structure factors, thereby reducing the accuracy of power quality evaluation, and it is also impossible to perform accurate harmonic adjustment

Method used

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  • Electric energy quality evaluation method and system for new energy field station converter device
  • Electric energy quality evaluation method and system for new energy field station converter device
  • Electric energy quality evaluation method and system for new energy field station converter device

Examples

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Embodiment 1

[0045] Such as figure 1 As shown, Embodiment 1 of the present disclosure provides a power quality evaluation method for a new energy station converter device, including the following steps:

[0046] Obtain the operating parameter data of the converter device of the new energy station;

[0047] According to the obtained operating parameter data, power generation unit output and filter structure parameters, the resonance amplitude and resonance frequency of the inverter output harmonics are obtained;

[0048] According to the obtained resonant amplitude and resonant frequency of the output harmonics of the inverter, the power quality evaluation result of the converter device is obtained.

[0049] This example is based on the electrical structure of the inverter of the photovoltaic and direct-drive wind turbine, considering the output characteristics of the photovoltaic array and the maximum power point tracking control (MPPT), and studies the principle of harmonic and interharm...

Embodiment 2

[0142] Embodiment 2 of the present disclosure provides a power quality evaluation system for a new energy station converter device, including:

[0143] The data acquisition module is configured to: acquire the operating parameter data of the converter device of the new energy station;

[0144] The resonance analysis module is configured to: obtain the resonance amplitude and resonance frequency of the inverter output harmonics according to the obtained operating parameter data, power generation unit output and filter structure parameters;

[0145] The electric energy evaluation module is configured to: obtain the electric energy quality evaluation result of the converter device according to the obtained resonance amplitude and resonance frequency of the output harmonic of the inverter.

[0146] The working method of the system is the same as the power quality evaluation method of the new energy station converter device provided in Embodiment 1, and will not be repeated here. ...

Embodiment 3

[0148] Embodiment 3 of the present disclosure provides a medium on which a program is stored, and when the program is executed by a processor, the steps in the method for evaluating power quality of a new energy station converter device as described in Embodiment 1 of the present disclosure are implemented, The steps are:

[0149] Obtain the operating parameter data of the converter device of the new energy station;

[0150] According to the obtained operating parameter data, power generation unit output and filter structure parameters, the resonance amplitude and resonance frequency of the inverter output harmonics are obtained;

[0151] According to the obtained resonant amplitude and resonant frequency of the output harmonics of the inverter, the power quality evaluation result of the converter device is obtained.

[0152] The detailed steps are the same as the power quality evaluation method of the new energy station converter device provided in Embodiment 1, and will not...

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Abstract

The invention provides an electric energy quality evaluation method and system for a new energy field station converter device, which belong to the technical field of new energy power generation. Themethod comprises the steps of obtaining operation parameter data of the new energy field station converter device, according to the obtained operation parameter data, the output of the power generation unit and the structure parameters of the filter, obtaining the harmonic amplitude value and the resonant frequency of the output harmonic of the inverter, and obtaining an electric energy quality evaluation result of the converter device according to the obtained harmonic amplitude value and resonance frequency of the output harmonic of the inverter. According to the influence of the output of the power generation unit and the structure of the filter on the output harmonic characteristics of the wind turbine generator / photovoltaic inverter, better evaluation on the output electric energy quality of the inverter is realized, and better electric energy output can be realized through parameter adjustment.

Description

technical field [0001] The present disclosure relates to the technical field of new energy power generation, and in particular to a power quality evaluation method and system for a converter device of a new energy station. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Photovoltaic power stations and wind farms transmit energy to the grid or local AC loads through inverters. The harmonics generated by these inverter devices containing a large number of power electronic devices present characteristics of wide frequency domain, and the harmonic resonance problem caused by network resonance will be Serious damage to the power grid. [0004] The inventors of the present disclosure found that the harmonic generation mechanism of existing power electronic devices is complicated, and the simple equivalent superposition of harmonic sources can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/38H02J3/46
CPCH02J3/01H02J3/381H02J3/46H02J2300/24H02J2300/28Y02E10/56Y02E10/76Y02E40/40
Inventor 王楠王士柏程艳孙树敏王玥娇邢家维滕玮李广磊于芃张兴友张用
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY