CN111650465A - Voltage and current split type electric energy quality measuring device and method for intelligent substation - Google Patents
Voltage and current split type electric energy quality measuring device and method for intelligent substation Download PDFInfo
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- CN111650465A CN111650465A CN202010694774.4A CN202010694774A CN111650465A CN 111650465 A CN111650465 A CN 111650465A CN 202010694774 A CN202010694774 A CN 202010694774A CN 111650465 A CN111650465 A CN 111650465A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a voltage and current split type electric energy quality measuring device and method for an intelligent substation, which can simultaneously measure voltage type and current type electric energy quality indexes, wherein measuring signals are respectively taken from analog voltage and current signals at the front end of a merging unit, so that electric energy quality indexes such as harmonic waves and the like are accurately obtained, and the problem that a digital electric energy quality measuring device cannot measure high-order harmonic waves and the measuring indexes in a traditional analog signal measuring method are incomplete is solved; the voltage measurement module and the current measurement module are respectively and independently arranged, a plurality of voltage signal measurement channels and current signal measurement channels are respectively arranged on the voltage measurement module and the current measurement module, the voltage measurement module and the current measurement module are both electrically connected with the high-precision clock wireless synchronization module, the voltage signal measurement channels and the current signal measurement channels are respectively and electrically connected with the voltage measurement screen and the current measurement screen, and the voltage measurement screen and the current measurement screen are both electrically connected with the merging unit.
Description
Technical Field
The invention discloses a voltage and current split type electric energy quality measuring device and method for an intelligent substation, belongs to the technical field of electric energy quality measurement, and particularly relates to an accurate electric energy quality measuring method for the intelligent substation.
Background
Intelligent substations are increasingly popular and undertake the tasks of conversion and transmission of electric energy. As power loads are more and more power electronic, the problem of power quality such as harmonic waves is more and more prominent. However, most of the current intelligent transformer substations have the voltage and current and signal sampling frequency of 4kHz and insufficient sampling frequency, and cannot meet the requirement of accurate measurement of electric energy quality indexes such as harmonic waves, particularly higher harmonics. At present, the electric energy quality test methods of the intelligent substation mainly comprise the following steps:
the first method is digital signal measurement. The method adopts a digital power quality test analyzer to acquire digital signals at the output end of a merging unit of the intelligent substation. Because the sampling frequency of the digital signal of the merging unit is 4kHz, and the harmonic transmission characteristic influence of the mutual inductor anti-aliasing filter for the merging unit instrument, only 13 harmonics can be accurately tested.
The second method is conventional analog signal measurement. The method adopts an analog electric energy quality test analyzer, and signals are obtained from analog signals of a mutual inductor input at the front end of a merging unit. The method has accurate test results, but is limited by the installation positions of the on-site voltage control cubicle and the current control cubicle of the intelligent substation, the voltage control cubicle and the current control cubicle are independent from each other and are far away from each other, and the simultaneous measurement of voltage and current is difficult.
The third method is a specific analog-to-digital conversion method for harmonic measurement. The method utilizes the special local module for high-precision harmonic measurement to collect voltage and current waveform data and then calculate the harmonic, can accurately measure the harmonic, increases the special local module and the measurement link, makes the communication protocol of the special local module and the digital measurement device complicated, and increases the difficulty and the cost of the on-site harmonic test of the intelligent station.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides a voltage and current split type electric energy quality measuring device and method for an intelligent substation, can simultaneously measure the voltage type and current type electric energy quality indexes, and the measuring signals are respectively taken from analog voltage and current signals at the front end of a merging unit, so that the electric energy quality indexes such as harmonic waves and the like can be accurately obtained, and the problem that a digital electric energy quality measuring device cannot measure high-order harmonic waves and the measuring indexes in the traditional analog signal measuring method are incomplete is solved.
In order to solve the technical problems, the invention adopts the technical scheme that: a voltage and current split type electric energy quality measuring device for an intelligent substation comprises a voltage measuring module, a current measuring module, a voltage signal measuring channel, a current signal measuring channel and a high-precision clock wireless synchronization module, wherein the voltage measuring module and the current measuring module are respectively and independently arranged and are respectively used for collecting analog waveform sampling signals of voltage and current, the voltage measuring module and the current measuring module are respectively and fixedly arranged in a voltage sink control cabinet and a current sink control cabinet, a plurality of voltage signal measuring channels and current signal measuring channels are respectively arranged on the voltage measuring module and the current measuring module, and the voltage measuring module and the current measuring module can be correspondingly provided with transformation ratio parameters of the voltage signal measuring channels and the current signal measuring channels; the voltage measuring module and the current measuring module are both electrically connected with the high-precision clock wireless synchronization module, so that clocks of the voltage measuring module device and the current measuring module device are kept synchronous, and the obtained voltage waveform data and the current waveform data are ensured to be synchronous; the voltage signal measuring channel and the current signal measuring channel are respectively electrically connected with the voltage measuring screen and the current measuring screen, the voltage measuring screen and the current measuring screen are both electrically connected with the merging unit, and the voltage measuring screen, the current measuring screen and the merging unit are both internally provided with control modules provided with electric energy quality analysis software, so that electric energy parameters can be displayed independently and can be displayed in a merging manner.
The voltage measuring module and the current measuring module can be used for independent measurement or combined use.
The invention relates to a voltage and current split type electric energy quality measuring method for an intelligent substation, which comprises the following steps:
firstly, a voltage signal measuring channel is connected to a voltage signal of a measuring object in a voltage screen, a current signal measuring channel is connected to a current signal of the corresponding measuring object in a current screen, and transformation ratio parameters of the voltage signal measuring channel and the current signal measuring channel are configured;
secondly, configuring a high-precision clock wireless synchronization module to keep clocks of the voltage measurement module device and the current measurement module device synchronous and ensure that the obtained voltage waveform data and the obtained current waveform data are synchronous;
thirdly, analyzing the power quality indexes of voltage classes including harmonic voltage and voltage flicker by using voltage waveform data; analyzing current type power quality indexes including harmonic current and unbalanced current by using current waveform data;
and fourthly, performing superposition calculation by utilizing the synchronous voltage waveform data and current waveform data, and analyzing the power quality indexes of harmonic power, reactive power and the like.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, a voltage signal measuring channel is connected to a voltage signal of a measuring object in a voltage screen, a current signal measuring channel is connected to a current signal corresponding to the measuring object in a current screen, transformation ratio parameters of the voltage signal measuring channel and the current signal measuring channel are configured, a high-precision clock wireless synchronization module is configured, clocks of a voltage measuring module device and a current measuring module device are kept synchronous, the obtained voltage waveform data and the obtained current waveform data are ensured to be synchronous, and the voltage waveform data are used for analyzing electric energy quality indexes of voltage classes such as harmonic voltage, voltage flicker and the like; the invention can simultaneously measure the voltage type and current type electric energy quality indexes, the measurement signals are respectively taken from analog voltage and current signals at the front end of the merging unit, the electric energy quality indexes such as harmonic waves and the like are accurately obtained, and the problem that a digital electric energy quality measuring device cannot measure high-order harmonics and the incomprehensive measurement indexes in a traditional analog signal measuring method is solved.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of the connection of the voltage measuring module and the current measuring module according to the present invention.
In the figure: the device comprises a voltage measuring module 1, a current measuring module 2, a voltage signal measuring channel 3, a current signal measuring channel 4, a high-precision clock wireless synchronization module 5, a voltage measuring screen 6, a current measuring screen 7 and a merging unit 8.
Detailed Description
As shown in fig. 1 and 2, the voltage and current split type power quality measuring device for an intelligent substation of the present invention includes: the voltage measuring module 1, the current measuring module 2, the voltage measuring module 1 are provided with a voltage signal measuring channel 3, the current measuring module 2 is provided with a current signal measuring channel 4, and the voltage measuring module 1 and the current measuring module 2 are respectively provided with a high-precision clock wireless synchronization module 5. The voltage measuring module 1 and the current measuring module 2 are independent devices respectively, collect analog waveform sampling signals of voltage and current respectively, can perform independent measurement, and can also be flexibly combined for use.
The invention relates to a voltage and current split type electric energy quality measuring method for an intelligent substation, which comprises the following steps:
the first step is as follows: the voltage signal measuring channel 3 is connected with a voltage analog signal in the voltage sink control cabinet, the current signal measuring channel 4 is connected with a corresponding current analog signal in the current sink control cabinet, and the transformation ratio parameters of the voltage signal measuring channel 3 and the current signal measuring channel 4 are configured;
the second step is that: a high-precision clock wireless synchronization module 5 is configured to keep the clocks of the voltage measurement module device 1 and the current measurement module device 2 synchronous, so that the obtained voltage waveform data and the obtained current waveform data are ensured to be synchronous;
the third step: analyzing the power quality indexes of voltage types such as voltage deviation, harmonic voltage, voltage flicker and the like by using voltage waveform data; analyzing current type power quality indexes such as harmonic current, unbalanced current and the like by using current waveform data;
the fourth step: and developing or utilizing voltage and current data comprehensive analysis software, such as PQViewer software, and utilizing synchronous voltage waveform data and current waveform data to perform superposition calculation and analyze power quality indexes such as harmonic power, reactive power and the like.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (3)
1. The utility model provides a split type electric energy quality measuring device of voltage electric current for intelligent substation, its characterized in that, includes voltage measurement module (1), current measurement module (2), voltage signal measurement passageway (3), current signal measurement passageway (4) and high accuracy clock wireless synchronization module (5), voltage measurement module (1) and current measurement module (2) independent setting respectively are used for gathering the analog waveform sampling signal of voltage and electric current respectively, voltage measurement module (1) and current measurement module (2) are fixed respectively and are set up in voltage collection accuse cabinet and current collection accuse cabinet, just be provided with a plurality of voltage signal measurement passageways (3) and current signal measurement passageway (4) on voltage measurement module (1) and current measurement module (2) respectively, configuration voltage signal measurement passageway (3) and current signal measurement passageway (4) that voltage measurement module (1) and current measurement module (2) can correspond ) The transformation ratio parameter of (2); the voltage measuring module (1) and the current measuring module (2) are electrically connected with the high-precision clock wireless synchronization module (5), so that clocks of the voltage measuring module device (1) and the current measuring module device (2) are kept synchronous, and the obtained voltage waveform data and the obtained current waveform data are ensured to be synchronous; voltage signal measurement passageway (3) and current signal measurement passageway (4) are connected with voltage measurement screen (6) and current measurement screen (7) electricity respectively, voltage measurement screen (6) and current measurement screen (7) all are connected with merging cells (8) electricity, all be provided with the control module who installs electric energy quality analysis software in voltage measurement screen (6) and current measurement screen (7) and merging cells (8) for the electric energy parameter can show alone also can merge the demonstration.
2. The voltage and current split type power quality measuring device for the intelligent substation is characterized in that the voltage measuring module (1) and the current measuring module (2) can be used independently or in combination.
3. The voltage and current split type power quality measurement method for the intelligent substation according to claim 1 is characterized by comprising the following steps:
firstly, a voltage signal measuring channel (3) is connected to a voltage signal of a measuring object in a voltage screen, a current signal measuring channel (4) is connected to a current signal of the corresponding measuring object in a current screen, and transformation ratio parameters of the voltage signal measuring channel (3) and the current signal measuring channel (4) are configured;
secondly, configuring a high-precision clock wireless synchronization module (5) to keep clocks of the voltage measurement module device (1) and the current measurement module device (2) synchronous and ensure that the obtained voltage waveform data and the obtained current waveform data are synchronous;
thirdly, analyzing the power quality indexes of voltage classes including harmonic voltage and voltage flicker by using voltage waveform data; analyzing current type power quality indexes including harmonic current and unbalanced current by using current waveform data;
and fourthly, performing superposition calculation by utilizing the synchronous voltage waveform data and current waveform data, and analyzing the power quality indexes of harmonic power, reactive power and the like.
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| CN202010694774.4A CN111650465A (en) | 2020-07-18 | 2020-07-18 | Voltage and current split type electric energy quality measuring device and method for intelligent substation |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854424A (en) * | 2012-09-18 | 2013-01-02 | 黑龙江省电力科学研究院 | Online power quality monitoring system for grid-connected points of booster station of wind power plant connected into power grid |
| CN104142434A (en) * | 2013-05-09 | 2014-11-12 | 上海电气自动化设计研究所有限公司 | On-line analysis measuring and monitoring system for power quality |
| CN105842649A (en) * | 2016-03-25 | 2016-08-10 | 国家电网公司 | On-line detection system for secondary side power metering system of smart substation and detection method thereof |
| CN106680617A (en) * | 2016-11-21 | 2017-05-17 | 广西电网有限责任公司电力科学研究院 | Wireless sampling-based electric energy quality test and analysis device |
| CN212622870U (en) * | 2020-07-18 | 2021-02-26 | 国网山西省电力公司电力科学研究院 | Voltage and current split type electric energy quality measuring device for intelligent substation |
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2020
- 2020-07-18 CN CN202010694774.4A patent/CN111650465A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854424A (en) * | 2012-09-18 | 2013-01-02 | 黑龙江省电力科学研究院 | Online power quality monitoring system for grid-connected points of booster station of wind power plant connected into power grid |
| CN104142434A (en) * | 2013-05-09 | 2014-11-12 | 上海电气自动化设计研究所有限公司 | On-line analysis measuring and monitoring system for power quality |
| CN105842649A (en) * | 2016-03-25 | 2016-08-10 | 国家电网公司 | On-line detection system for secondary side power metering system of smart substation and detection method thereof |
| CN106680617A (en) * | 2016-11-21 | 2017-05-17 | 广西电网有限责任公司电力科学研究院 | Wireless sampling-based electric energy quality test and analysis device |
| CN212622870U (en) * | 2020-07-18 | 2021-02-26 | 国网山西省电力公司电力科学研究院 | Voltage and current split type electric energy quality measuring device for intelligent substation |
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