CN111193264A - Comprehensive control method for power quality control - Google Patents
Comprehensive control method for power quality control Download PDFInfo
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- CN111193264A CN111193264A CN202010137705.3A CN202010137705A CN111193264A CN 111193264 A CN111193264 A CN 111193264A CN 202010137705 A CN202010137705 A CN 202010137705A CN 111193264 A CN111193264 A CN 111193264A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The invention provides an electric energy quality control comprehensive control method, which comprises the steps of monitoring the changes of voltage and current in an electric power system in real time, collecting the voltage waveform and the current waveform of the current moment, calculating current components, namely fundamental wave current and 2-50 times of harmonic current components through discrete Fourier transform, then calculating electric power parameters such as reactive power, active power, apparent power, power factors, harmonic voltage and distortion rate of each time and harmonic current and wave distortion rate of each time by combining the voltage, and setting three compensation modes, wherein a main control module is communicated with compensation equipment, the main control module operates the three compensation modes according to the electric power parameters, and the three compensation modes are selected to be used according to an electric power environment.
Description
Technical Field
The invention relates to the technical field of electric energy management, in particular to an electric energy quality management comprehensive control method.
Background
With the rapid progress of current social electrification, a plurality of electric equipment with good performance and high efficiency are used by users at the electricity utilization end from a power supply end to the electricity utilization end, but the requirements of the electric equipment on a power grid are higher and higher, the original electric energy quality environment cannot meet the increasingly refined electric equipment, the problems of electric energy quality such as reactive compensation, harmonic waves, inter-harmonic waves, frequency change, direct current in an alternating current network, voltage flicker, inrush current, three-phase imbalance and the like are mainly reflected, and the electric energy quality control is required to move towards the direction of integration, greenization and intellectualization.
Therefore, in order to further improve the power quality in a low-voltage power distribution system and meet the requirements of power utilization terminals, the method aims to research a specific implementation technical path required by power quality management in a direction of integration, greening and intellectualization, wherein an optimized comprehensive control method plays a particularly important role in power quality management, which is beneficial to better realizing power quality management, for example, the same set of compensation hardware adopts different control methods and brings different technical effects, and therefore, the method researches the problems and provides a power quality management comprehensive control method with better performance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a comprehensive control method for controlling the quality of electric energy, which has better performance.
In order to solve the technical problems, the invention provides an electric energy quality management comprehensive control method, which comprises the steps of monitoring the changes of voltage and current in an electric power system in real time, collecting the voltage waveform and the current waveform of the current moment, calculating current components, namely fundamental wave current and harmonic current components of 2-50 times through discrete Fourier transform, then calculating power parameters such as reactive power, active power, apparent power, power factors, harmonic voltage and distortion rate of each time and harmonic current and harmonic distortion rate of each time by combining the voltage, and setting three compensation modes, wherein the main control module is communicated with compensation equipment, the main control module runs three compensation modes according to the power parameters, the three compensation modes are selected and used according to the power environment, and the three compensation modes are as follows:
1) and a reactive compensation mode:
the priority order of compensation of the compensation equipment is C, SVC, SVG and SPC, C is an intelligent capacitor, SVC is a static dynamic reactive compensator, SVG is a static reactive generator, and SPC is a three-phase imbalance adjusting device; when the detection result shows that the harmonic distortion rate in the circuit is smaller than the set upper limit value of the harmonic distortion rate, static reactive compensation is carried out, during the static reactive compensation, the reactive compensation amount is firstly compensated by C, SVC, and the rest part which cannot be compensated by C and SVC is compensated by SVG; after balancing, when the reactive compensation amount of the system changes, the SVG can preferentially and quickly respond to the reactive amount for compensating the change, and when the compensated capacity of the SVG is increased or reduced to the compensation amount which can be completely compensated by one C, the compensated reactive amount of the SVG is switched to be compensated by the C or the SVC or the combination of the C and the SVC, and the SVG compensates other uncompensated reactive amounts or completes the compensation, and cuts off the SVG; if the three phases of the system have the condition that the compensation amount is not equal and is smaller than the static single compensation capacity after C, SVC compensation, starting SPC to perform three-phase unbalance adjustment;
2) and a harmonic filtering mode:
when the APF detects that harmonic waves are generated in the power system and exceed the set upper limit value of the harmonic wave distortion rate, a filtering mode in the APF is started, the harmonic waves in the circuit are calculated by analyzing feedback data, and then the APF system generates corresponding reverse harmonic waves to be eliminated; APF is an active filter;
3) and a hybrid compensation mode:
preferentially operating a harmonic filtering mode, then operating a reactive compensation mode, and simultaneously, always operating the harmonic filtering mode, specifically: when the harmonic distortion rate in the circuit is detected to be larger than the set upper limit value of the harmonic distortion rate, firstly, harmonic filtering is carried out according to a harmonic filtering mode, whether reactive compensation is needed or not is detected, if yes, compensation is carried out according to a reactive compensation mode, and at the moment, the harmonic filtering mode and the reactive compensation mode are in a simultaneous operation state to form hybrid compensation.
After adopting the structure, compared with the prior art, the invention has the following advantages: the invention provides an optimized control method, which can realize the comprehensive control of SVG, SPC, APF, C and SVC, wherein three compensation modes are selected and used according to the power environment, when the power environment only needs reactive compensation, only the 1 st) mode needs to be operated, when the power environment only needs harmonic filtering, only the 2 nd) mode needs to be operated, and in addition, the 3 rd) mode can be selected to be operated.
As an improvement, the main control module is connected with a touch screen, and the touch screen displays related parameters and setting information, so that real-time parameters and running states of the whole system can be observed more visually through the touch screen, and meanwhile, manual control and parameter setting are convenient to carry out.
As an improvement, the touch screen can perform related settings, wherein the related settings include a CT transformation ratio, a target power factor, an overvoltage protection value, a temperature upper limit value, a reactive compensation setting, a harmonic compensation setting, a hybrid compensation setting, and manual/automatic compensation, and are specifically defined as follows:
1) CT transformation ratio: calculating the current magnitude and analyzing the current waveform of each sampling point by setting the transformation ratio of a system side transformer, the transformation ratio of a reactive compensation branch transformer and the transformation ratio of an SVG/APF compensation branch transformer;
2) target power factor: setting a target power factor to be achieved, and after the target power factor is determined, controlling each reactive power compensation device to compensate by the system until the power factor reaches a set value;
3) overvoltage protection value: when the voltage is too high, the protection function is started, and the added compensation device is cut off to achieve the protection effect;
4) upper limit of temperature: the settable range of the upper limit value of the temperature is 50-70 ℃, and after the upper limit value is set, if the detected temperature exceeds the upper limit value, the thrown compensation device is cut off to achieve the protection effect;
5) the electric energy quality governance mode:
the following three power quality control modes are automatically or manually selected:
① reactive compensation setting, through which the type of reactive compensation device can be selected and set accordingly;
② harmonic compensation setting, by which the number of harmonics to be filtered and the harmonic current magnitude ratio can be set;
③ hybrid compensation setting, by which it can be set to preferentially filter out harmonics and then reactive compensation;
6) manual/automatic compensation: the manual mode or the automatic mode can be set through the setting, and the added compensation device can be cut off or the compensation device which is not added can be added in the manual mode, so that the test and the debugging are convenient; in an automatic state, automatically operating according to one of three manually selected compensation modes;
therefore, abundant settings are provided, and the method is better realized according to the field application environment, so that the method has higher flexibility.
As an improvement, the main control module uploads related parameters and setting information to the cloud platform through the communication module and displays the parameters and the setting information in the visual interface, and the cloud platform sends the user setting information to the main control module, so that remote monitoring of workers is facilitated better, and meanwhile real-time regulation and control and historical record query can be carried out according to field requirements.
As an improvement, related parameters and setting information are uploaded to a cloud platform or a mobile terminal or both and displayed in a visual interface, so that development of the Internet of things is linked, an authorizer can monitor real-time data of the whole system at any time and any place and set the related parameters through interface operation, the data is sent to a database, the received data is returned to a main control module by the data, the main control module updates the corresponding setting parameters and recalculates power parameters, and then the corresponding compensation equipment is controlled according to a set control mode.
As an improvement, the main control module and the compensation equipment are communicated with each other, the data format of the transmitted data adopts a 16-system format, the high order is in front, the low order is in back, the data format comprises 16 bytes, and the data format comprises a header, an address, a command, a length, data 1 to data 9, checking, carriage return and line change;
1) the word header is used for representing the address information of the main control module;
2) the address is used for containing address information of the compensation equipment to be connected;
3) the command is used for representing a compensation command mode issued by the main control module to the compensation equipment;
4) the length is used for representing the data length of the data 1-9 sent by the main control module;
5) data field representation:
data 1-2 for information including harmonic order, namely: information related to 17 th-2 nd harmonic current with 8bits higher and 8bits lower;
data 3, used for representing the information of idle selection and power on/off, the low 4bit is used for idle selection, the high 4bit is used for power on/off selection, specifically: 0xF0 indicates a power-on state, no power on; 0xFF represents a starting state and is started in a reactive mode; 0x00 represents a shutdown state, reactive shutdown.
Data 4, which is used for representing the amplitude of the total effective value amplitude of the harmonic phase A;
data 5 for the magnitude of the harmonic B phase total effective value clipping;
data 6 for the magnitude of the harmonic C phase total effective value clipping;
data 7 for indicating the magnitude of clipping of the total effective value of the reactive a phase;
data 8 for representing the magnitude of clipping of the reactive B-phase total effective value;
data 9, which is used for representing the amplitude limit of the reactive C phase total effective value;
6) checking, which is used for representing the information of the accumulated sum of 2) to 5), and the accumulated sum is lower than the information of 8 bits;
7) carriage return and line feed for indicating the end of the command;
therefore, the command format is simplified, the online with compensation equipment of other manufacturers is facilitated, the communication protocol content is simple and specific, the application range is wide, the performance of the invention is more favorably exerted on the basis, and the performance of the invention is better in practical engineering application after the design.
Drawings
Fig. 1 is a system block diagram that can operate a power quality management integrated control method of the present invention.
Detailed Description
The invention is described in further detail below:
the invention relates to an electric energy quality control comprehensive control method, which comprises the steps of monitoring the changes of voltage and current in an electric power system in real time, collecting the voltage waveform and the current waveform of the current moment, calculating current components, namely fundamental current and 2-50 times of harmonic current components through discrete Fourier transform, then calculating electric power parameters such as reactive power, active power, apparent power, power factors, harmonic voltage and distortion rate of each time and harmonic current and wave distortion rate of each time by combining the voltage, and setting three compensation modes, wherein a main control module is communicated with compensation equipment, runs three compensation modes according to the electric power parameters, and the three compensation modes are selected to be used according to an electric power environment and are as follows:
1) and a reactive compensation mode:
the priority order of compensation of the compensation equipment is C, SVC, SVG and SPC, C is an intelligent capacitor, SVC is a static dynamic reactive compensator, SVG is a static reactive generator, and SPC is a three-phase imbalance adjusting device; when the detection result shows that the harmonic distortion rate in the circuit is smaller than the set upper limit value of the harmonic distortion rate, static reactive compensation is carried out, during the static reactive compensation, the reactive compensation amount is firstly compensated by C, SVC, and the rest part which cannot be compensated by C and SVC is compensated by SVG; after balancing, when the reactive compensation amount of the system changes, the SVG can preferentially and quickly respond to the reactive amount for compensating the change, and when the compensated capacity of the SVG is increased or reduced to the compensation amount which can be completely compensated by one C, the compensated reactive amount of the SVG is switched to be compensated by the C or the SVC or the combination of the C and the SVC, and the SVG compensates other uncompensated reactive amounts or completes the compensation, and cuts off the SVG; if the three phases of the system have the condition that the compensation amount is not equal and is smaller than the static single compensation capacity after C, SVC compensation, starting SPC to perform three-phase unbalance adjustment;
2) and a harmonic filtering mode:
when the APF detects that harmonic waves are generated in the power system and exceed the set upper limit value of the harmonic wave distortion rate, a filtering mode in the APF is started, the harmonic waves in the circuit are calculated by analyzing feedback data, and then the APF system generates corresponding reverse harmonic waves to be eliminated; APF is an active filter;
the APF system generates corresponding reverse harmonic waves to be eliminated, so that the filtering effect is achieved, the output amplitude ratio of 2-50 integer harmonic wave current can be set, for example, the amplitude ratio is set to be 50% aiming at 3 harmonic waves, namely, the APF outputs 3 harmonic wave current with the size accounting for 50% of the capacity of the whole APF;
3) and a hybrid compensation mode:
preferentially operating a harmonic filtering mode, then operating a reactive compensation mode, and simultaneously, always operating the harmonic filtering mode, specifically: when the harmonic distortion rate in the circuit is detected to be larger than the set upper limit value of the harmonic distortion rate, firstly, harmonic filtering is carried out according to a harmonic filtering mode, whether reactive compensation is needed or not is detected, if yes, compensation is carried out according to a reactive compensation mode, and at the moment, the harmonic filtering mode and the reactive compensation mode are in a simultaneous operation state to form hybrid compensation.
The main control module is connected with a touch screen, and the touch screen displays related parameters and setting information.
The touch screen can be set in a related way, the related settings comprise CT transformation ratio, target power factor, overvoltage protection value, temperature upper limit value, reactive compensation setting, harmonic compensation setting, mixed compensation setting and manual/automatic compensation, and the related settings are specifically defined as follows:
1) CT transformation ratio: calculating the current magnitude and analyzing the current waveform of each sampling point by setting the transformation ratio of a system side transformer, the transformation ratio of a reactive compensation branch transformer and the transformation ratio of an SVG/APF compensation branch transformer;
2) target power factor: setting a target power factor to be achieved, and after the target power factor is determined, controlling each reactive power compensation device to compensate by the system until the power factor reaches a set value;
3) overvoltage protection value: when the voltage is too high, the protection function is started, and the added compensation device is cut off to achieve the protection effect;
4) upper limit of temperature: the settable range of the upper limit value of the temperature is 50-70 ℃, and after the upper limit value is set, if the detected temperature exceeds the upper limit value, the thrown compensation device is cut off to achieve the protection effect;
5) the electric energy quality governance mode:
the following three power quality control modes are automatically or manually selected:
① reactive compensation setting, through which the type of reactive compensation device can be selected and set accordingly;
② harmonic compensation setting, by which the number of harmonics to be filtered and the harmonic current magnitude ratio can be set;
③ hybrid compensation setting, by which it can be set to preferentially filter out harmonics and then reactive compensation;
6) manual/automatic compensation: the manual mode or the automatic mode can be set through the setting, and the added compensation device can be cut off or the compensation device which is not added can be added in the manual mode, so that the test and the debugging are convenient; in the automatic state, the automatic operation is performed according to one of three compensation modes selected manually.
The main control module uploads the related parameters and the setting information to the cloud platform through the communication module and displays the related parameters and the setting information in the visual interface, and the cloud platform sends the user setting information to the main control module.
And uploading the related parameters and the setting information to the cloud platform or the mobile terminal or both, and displaying the related parameters and the setting information in a visual interface.
The main control module and the compensation equipment are communicated with each other, the data format of the transmitted data adopts a 16-system mode, the high order is in front, the low order is in back, 16 bytes are provided, and the data format comprises a header, an address, a command, a length, data 1 to data 9, checking, carriage return and line feed;
1) the word header is used for representing the address information of the main control module;
2) the address is used for containing address information of the compensation equipment to be connected;
3) the command is used for representing a compensation command mode issued by the main control module to the compensation equipment;
4) the length is used for representing the data length of the data 1-9 sent by the main control module;
5) data field representation:
data 1-2 for information including harmonic order, namely: information related to 17 th-2 nd harmonic current with 8bits higher and 8bits lower; specific examples are as follows:
data 3, used for representing the information of idle selection and power on/off, the low 4bit is used for idle selection, the high 4bit is used for power on/off selection, specifically: 0xF0 indicates a power-on state, no power on; 0xFF represents a starting state and is started in a reactive mode; 0x00 represents a shutdown state, reactive shutdown.
Data 4, which is used for representing the amplitude of the total effective value amplitude of the harmonic phase A;
data 5 for the magnitude of the harmonic B phase total effective value clipping;
data 6 for the magnitude of the harmonic C phase total effective value clipping;
data 7 for indicating the magnitude of clipping of the total effective value of the reactive a phase;
data 8 for representing the magnitude of clipping of the reactive B-phase total effective value;
data 9, which is used for representing the amplitude limit of the reactive C phase total effective value;
6) checking, which is used for representing the information of the accumulated sum of 2) to 5), and the accumulated sum is lower than the information of 8 bits;
7) carriage return and line feed to indicate the end of the command.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.
Claims (6)
1. A comprehensive control method for power quality control is characterized in that voltage waveform and current waveform at the current moment are collected by monitoring changes of voltage and current in a power system in real time, current components, namely fundamental wave current and 2-50 harmonic current components, are calculated through discrete Fourier transform, then power parameters such as reactive power, active power, apparent power, power factors, harmonic voltage and distortion rate and harmonic current and wave distortion rate are calculated by combining the voltage, three compensation modes are set, a main control module is communicated with compensation equipment, the main control module operates three compensation modes according to the power parameters, the three compensation modes are selected and used according to power environments, and the three compensation modes are as follows:
1) and a reactive compensation mode:
the priority order of compensation of the compensation equipment is C, SVC, SVG and SPC, C is an intelligent capacitor, SVC is a static dynamic reactive compensator, SVG is a static reactive generator, and SPC is a three-phase imbalance adjusting device; when the detection result shows that the harmonic distortion rate in the circuit is smaller than the set upper limit value of the harmonic distortion rate, static reactive compensation is carried out, during the static reactive compensation, the reactive compensation amount is firstly compensated by C, SVC, and the rest part which cannot be compensated by C and SVC is compensated by SVG; after balancing, when the reactive compensation amount of the system changes, the SVG can preferentially and quickly respond to the reactive amount for compensating the change, and when the compensated capacity of the SVG is increased or reduced to the compensation amount which can be completely compensated by one C, the compensated reactive amount of the SVG is switched to be compensated by the C or the SVC or the combination of the C and the SVC, and the SVG compensates other uncompensated reactive amounts or completes the compensation, and cuts off the SVG; if the three phases of the system have the condition that the compensation amount is not equal and is smaller than the static single compensation capacity after C, SVC compensation, starting SPC to perform three-phase unbalance adjustment;
2) and a harmonic filtering mode:
when the APF detects that harmonic waves are generated in the power system and exceed the set upper limit value of the harmonic wave distortion rate, a filtering mode in the APF is started, the harmonic waves in the circuit are calculated by analyzing feedback data, and then the APF system generates corresponding reverse harmonic waves to be eliminated; APF is an active filter;
3) and a hybrid compensation mode:
preferentially operating a harmonic filtering mode, then operating a reactive compensation mode, and simultaneously, always operating the harmonic filtering mode, specifically: when the harmonic distortion rate in the circuit is detected to be larger than the set upper limit value of the harmonic distortion rate, firstly, harmonic filtering is carried out according to a harmonic filtering mode, whether reactive compensation is needed or not is detected, if yes, compensation is carried out according to a reactive compensation mode, and at the moment, the harmonic filtering mode and the reactive compensation mode are in a simultaneous operation state to form hybrid compensation.
2. The electric energy quality governance integrated control method according to claim 1, wherein the master control module is connected with a touch screen, and the touch screen displays relevant parameters and setting information.
3. The electric energy quality governance integrated control method according to claim 2, wherein the touch screen can perform relevant settings including CT transformation ratio, target power factor, overvoltage protection value, upper temperature limit, reactive compensation setting, harmonic compensation setting, hybrid compensation setting, manual/automatic compensation, specifically defined as follows:
1) CT transformation ratio: calculating the current magnitude and analyzing the current waveform of each sampling point by setting the transformation ratio of a system side transformer, the transformation ratio of a reactive compensation branch transformer and the transformation ratio of an SVG/APF compensation branch transformer;
2) target power factor: setting a target power factor to be achieved, and after the target power factor is determined, controlling each reactive power compensation device to compensate by the system until the power factor reaches a set value;
3) overvoltage protection value: when the voltage is too high, the protection function is started, and the added compensation device is cut off to achieve the protection effect;
4) upper limit of temperature: the settable range of the upper limit value of the temperature is 50-70 ℃, and after the upper limit value is set, if the detected temperature exceeds the upper limit value, the thrown compensation device is cut off to achieve the protection effect;
5) the electric energy quality governance mode:
the following three power quality control modes are automatically or manually selected:
① reactive compensation setting, through which the type of reactive compensation device can be selected and set accordingly;
② harmonic compensation setting, by which the number of harmonics to be filtered and the harmonic current magnitude ratio can be set;
③ hybrid compensation setting, by which it can be set to preferentially filter out harmonics and then reactive compensation;
6) manual/automatic compensation: the manual mode or the automatic mode can be set through the setting, and the added compensation device can be cut off or the compensation device which is not added can be added in the manual mode, so that the test and the debugging are convenient; in the automatic state, the automatic operation is performed according to one of three compensation modes selected manually.
4. The electric energy quality governance integrated control method according to claim 1, wherein the master control module uploads relevant parameters and setting information to the cloud platform through the communication module and displays the same in the visual interface, and the cloud platform sends user setting information to the master control module.
5. The electric energy quality governance integrated control method according to claim 4, wherein the relevant parameters and setting information are uploaded to a cloud platform or a mobile terminal or both and displayed in a visual interface.
6. The power quality governance integrated control method according to claim 1, wherein the master control module communicates with the compensation equipment, the data format of the transmitted data adopts a 16-system, the high order is before, the low order is after, and has 16 bytes, the data format comprises a header, an address, a command, a length, data 1 to data 9, checking, carriage return, and line feed;
1) the word header is used for representing the address information of the main control module;
2) the address is used for containing address information of the compensation equipment to be connected;
3) the command is used for representing a compensation command mode issued by the main control module to the compensation equipment;
4) the length is used for representing the data length of the data 1-9 sent by the main control module;
5) data field representation:
data 1-2 for information including harmonic order, namely: information related to 17 th-2 nd harmonic current with 8bits higher and 8bits lower;
data 3, used for representing the information of idle selection and power on/off, the low 4bit is used for idle selection, the high 4bit is used for power on/off selection, specifically: 0xF0 indicates a power-on state, no power on; 0xFF represents a starting state and is started in a reactive mode; 0x00 represents a shutdown state, reactive shutdown.
Data 4, which is used for representing the amplitude of the total effective value amplitude of the harmonic phase A;
data 5 for the magnitude of the harmonic B phase total effective value clipping;
data 6 for the magnitude of the harmonic C phase total effective value clipping;
data 7 for indicating the magnitude of clipping of the total effective value of the reactive a phase;
data 8 for representing the magnitude of clipping of the reactive B-phase total effective value;
data 9, which is used for representing the amplitude limit of the reactive C phase total effective value;
6) checking, which is used for representing the information of the accumulated sum of 2) to 5), and the accumulated sum is lower than the information of 8 bits;
7) carriage return and line feed to indicate the end of the command.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111525574A (en) * | 2020-07-06 | 2020-08-11 | 深圳华工能源技术有限公司 | Harmonic suppression energy-saving and three-phase imbalance treatment energy-saving coordination control method |
| CN113346525A (en) * | 2021-04-25 | 2021-09-03 | 西安交通大学 | Power quality control cluster system at tail end of power distribution network and power quality control method |
| CN113708383A (en) * | 2021-09-16 | 2021-11-26 | 安徽海螺建材设计研究院有限责任公司 | Electric energy loss and electric energy quality comprehensive processing method and system |
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| EP4224653A4 (en) * | 2020-09-30 | 2024-04-10 | Daikin Industries, Ltd. | Power control system and equipment |
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