CN111509719B - Intelligent harmonic control system based on Internet of things - Google Patents

Intelligent harmonic control system based on Internet of things Download PDF

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Publication number
CN111509719B
CN111509719B CN202010205755.0A CN202010205755A CN111509719B CN 111509719 B CN111509719 B CN 111509719B CN 202010205755 A CN202010205755 A CN 202010205755A CN 111509719 B CN111509719 B CN 111509719B
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power grid
harmonic
intelligent
current
module
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CN111509719A (en
Inventor
张家亮
胡锦波
李梓瑞
尹湛青
梁嘉键
丁安康
丁逸洲
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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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
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • H02J2213/00—Indexing scheme relating to details of circuit arrangements for providing remote indication of network conditions of for circuit arrangements for providing remote control of switching means in a power distribution network
    • H02J2213/10—Indexing scheme relating to details of circuit arrangements for providing remote indication of network conditions of for circuit arrangements for providing remote control of switching means in a power distribution network using simultaneously two or more different transmission means
    • 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
    • Y02E40/20—Active power filtering [APF]
    • 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
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol

Abstract

The invention provides an intelligent harmonic governance system based on the Internet of things, which relates to the technical field of power systems and comprises an LCLCL active power filter, wherein the LCLCL active power filter is connected with a three-phase power grid in parallel and is used for rapidly, stably and highly accurately tracking power grid harmonic and reactive power, filtering the power grid harmonic and compensating the reactive power of the power grid; the intelligent power grid based on WM-BUS communication is used for carrying out remote monitoring and management on the power grid; the LCLCL type active power filter and the intelligent power grid based on WM-BUS communication are connected in series to form an intelligent harmonic treatment system based on the Internet of things, and the intelligent harmonic treatment system is connected in parallel to a three-phase power grid, so that the intelligent harmonic treatment system is suitable for power grid compensation and monitoring of medium-voltage heavy loads. The method effectively carries out remote transmission and remote reconstruction of waveforms, efficiently carries out communication between the power grid end and the monitoring center, ensures safe, stable and reliable operation of the power grid, realizes low-cost and high-efficiency measurement and transmission of power grid monitoring information in the Internet of things, and can adapt to the change of the power grid frequency.

Description

Intelligent harmonic control system based on Internet of things
Technical Field
The invention relates to the technical field of power systems,
in particular, the invention relates to an intelligent harmonic treatment system based on the Internet of things.
Background
Electrical energy is an important basis for social progress and development, and human attention to electrical energy quality has never been stopped.
Based on the rapid progress of intelligent electronic application technology, various power electronic technical equipment and facilities are widely applied in various fields such as power, traffic, industrial production and the like, but a power electronic equipment device is a nonlinear time-varying topological load, reactive power and harmonic waves generated during the working of the power electronic equipment device enter a power grid, the capacity and line energy loss of the power electronic equipment device can be increased, the utilization rate of a power generation and distribution device can be greatly reduced, the quality of power supply is greatly reduced, and the working stability and safety of the power electronic equipment are threatened.
In recent years, the development of distributed energy and renewable energy is accelerated, so that the power grid scale is continuously enlarged, the management difficulty is continuously increased, and the reliability of power grid monitoring is more difficult to ensure. In the traditional power data acquisition monitoring system, 2-4 seconds are required from a sensor to a control center due to slower data transmission, so that real-time performance is difficult to ensure. In addition, the data measured by the system does not contain a time stamp, and the information of the system state at a specific moment cannot be provided, so that the unreliability of power grid monitoring is further increased.
Therefore, in order to solve the above problems, it is necessary to design a reasonable intelligent harmonic control system based on the internet of things.
Disclosure of Invention
The invention aims to provide the intelligent harmonic wave treatment system based on the Internet of things, which can effectively carry out remote transmission and remote reconstruction of waveforms, effectively carry out communication between a power grid end and a monitoring center, realize low-cost and high-efficiency measurement and transmission of power grid monitoring information in the Internet of things while ensuring safe, stable and reliable operation of the power grid, and simultaneously adapt to the change of power grid frequency.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
an intelligent harmonic governance system based on the internet of things, comprising:
an LCLCL Active Power Filter (APF) connected in parallel with the three-phase power grid and used for rapidly, stably and highly accurately tracking the power grid harmonic wave and reactive power, filtering the power grid harmonic wave and compensating the reactive power of the power grid;
the intelligent power grid based on WM-BUS communication is used for carrying out remote monitoring and management on the power grid;
the LCLCL active power filter and the intelligent power grid based on WM-BUS communication are connected in series to form an intelligent harmonic treatment system based on the Internet of things, and the intelligent harmonic treatment system is connected in parallel to the three-phase power grid, so that the intelligent harmonic treatment system is suitable for power grid compensation and monitoring of medium-voltage heavy loads.
As a preferred aspect of the present invention, the LCLCL type active power filter includes an LCLCL type filter, a detection module, a control module, a light-blocking driving module, and an IGBT module, which form a current control closed loop, wherein:
the LCLCL type filter is used for realizing the suppression effect on harmonic waves at the system switching frequency;
the detection module is used for detecting harmonic current of the three-phase power grid;
the control module is used for calculating instruction current according to the harmonic current data input by the detection module;
and the light isolation driving module is used for controlling the output current of the IGBT module according to the instruction current output by the control module.
As an advantage of the present invention, the smart grid based on WM-BUS communication includes a data processing module, a grid-side transmission module, a monitoring-side transmission module, and a monitoring center, where:
the data processing module is used for processing the collected three-phase power grid terminal voltage and current data to obtain frequency, energy and waveform information containing a time tag, and then packaging the information into a WM-BUS data packet;
the power grid end transmission module is used for receiving the instruction of the monitoring center and transmitting the data packet of the data processing module to the monitoring center;
the monitoring end transmission module is used for sending an instruction to the power grid end and receiving data information transmitted by the power grid end;
the monitoring center is used for generating instructions, and displaying the power grid data received by the monitoring end transmission module through the upper computer in real time and dynamically to realize man-machine interaction.
As the optimization of the invention, the LCLCL type filter comprises a reactor and a capacitor, wherein the reactor and the capacitor are connected in series to form a series resonant circuit, after the series resonant circuit is connected in parallel with another capacitor, two branches are led out, one series reactor is connected to a power grid, the other series reactor is connected with the IGBT module, the system switching frequency has a function of inhibiting harmonic waves, and fundamental wave current and harmonic wave compensation current output by the IGBT module are ensured to be transmitted to the power grid, so that the LCLCLCL type filter has a good high-frequency harmonic wave bypass function.
It should be noted that the parameters of the reactor and the capacitor in the lclclcl type filtering are 49.53 μh, 2 μf, 0.1 μh, and 2 μh in sequence, that is, the reactor with the parameter of 49.53 μh and the capacitor with the parameter of 2 μf are connected in series to form a series resonant circuit, after the series resonant circuit is connected in parallel with the capacitor with the parameter of 2 μf, two branches are led out, one reactor with the parameter of 0.1 μh in series is connected to the power grid, and the other reactor with the parameter of 2 μh in series is connected with the IGBT module.
Preferably, the LCLCL type filter adopts capacitance-current proportional feedback to inhibit resonance peaks of the system.
As a preferred aspect of the present invention, the detection module uses AD7606 for power grid harmonic current data acquisition.
As the preferable mode of the invention, the control module uses a DSP chip with the model TMS32F28035, calculates the current to be compensated after acquiring the data of the harmonic current from the detection module, and converts the current to the command current to control the light barrier drive.
As the optimization of the invention, the LCLCL type active power filter adopts a control mode of proportional feedforward control, and is used for realizing all-pass characteristics in a low frequency band of a resonant frequency and attenuation characteristics in a middle-high frequency band, thereby realizing the purposes of constant low-frequency gain and compensating the phase angle margin of a system.
Preferably, the data processing module automatically generates MCT vectors by using RTSG algorithm, namely a data saving waveform recording mode based on interpolation, which is used for remote transmission and remote reconstruction of waveforms.
As the optimization of the invention, the power grid end transmission module and the monitoring end transmission module use F8913D zigbee to send data to the Internet of things and receive data from the Internet of things.
The intelligent harmonic treatment system based on the Internet of things has the beneficial effects that: the RTSG algorithm is adopted to carry out remote transmission and remote reconstruction of waveforms, the WM-BUS communication mode is used to carry out communication between the power grid end and the monitoring center, the safe, stable and reliable operation of the power grid is ensured, the low-cost and high-efficiency measurement and transmission of the power grid monitoring information in the Internet of things are realized, and meanwhile, the change of the power grid frequency can be adapted.
Drawings
FIG. 1 is a schematic diagram of a main circuit structure of an intelligent harmonic governance system based on the Internet of things;
FIG. 2 is a working block diagram of an RTSG algorithm for waveform remote transmission and reconstruction related to an intelligent harmonic governance system based on the Internet of things;
FIG. 3 is a graph showing the relationship between the relative error of frequency measurement and SNR and frequency variation of RTSG algorithm related to an intelligent harmonic governance system based on the Internet of things;
fig. 4 is a graph showing the relationship between the relative error of frequency measurement and the change of SNR and frequency in the Goetzel algorithm, which is related to the intelligent harmonic governance system based on the Internet of things.
Detailed Description
The following are specific examples of the present invention, and the technical solutions of the present invention are further described, but the present invention is not limited to these examples.
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the modules and steps set forth in these embodiments and the steps do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the flow in the drawings is not merely performed alone, but a plurality of steps are performed to cross each other for convenience of description.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and systems known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate.
In recent years, the development of distributed energy and renewable energy is accelerated, so that the power grid scale is continuously enlarged, the management difficulty is continuously increased, and the reliability of power grid monitoring is more difficult to ensure. In the traditional power data acquisition monitoring system, 2-4 seconds are required from a sensor to a control center due to slower data transmission, so that real-time performance is difficult to ensure. In addition, the data measured by the system does not contain a time stamp, and the information of the system state at a specific moment cannot be provided, so that the unreliability of power grid monitoring is further increased.
Embodiment one: as shown in fig. 1, which is only one embodiment of the present invention, an intelligent harmonic control system based on the internet of things includes:
an LCLCL Active Power Filter (APF) connected in parallel with the three-phase power grid and used for rapidly, stably and highly accurately tracking the power grid harmonic wave and reactive power, filtering the power grid harmonic wave and compensating the reactive power of the power grid;
the intelligent power grid based on WM-BUS communication is used for carrying out remote monitoring and management on the power grid;
the LCLCL active power filter and the intelligent power grid based on WM-BUS communication are connected in series to form an intelligent harmonic treatment system based on the Internet of things, and the intelligent harmonic treatment system is connected in parallel to the three-phase power grid, so that the intelligent harmonic treatment system is suitable for power grid compensation and monitoring of medium-voltage heavy loads.
Here, the active power filter of lclclcl type, including LCLCL type filter, detection module, control module, light separates drive module and IGBT module, constitute the current control closed loop, wherein:
the LCLCL type filter is used for realizing the suppression effect on harmonic waves at the system switching frequency;
the detection module is used for detecting harmonic current of the three-phase power grid;
the control module is used for calculating instruction current according to the harmonic current data input by the detection module;
and the light isolation driving module is used for controlling the output current of the IGBT module according to the instruction current output by the control module.
In addition, smart power grids based on WM-BUS communication include data processing module, electric wire netting end transmission module, monitor end transmission module and monitoring center, wherein:
the data processing module is used for processing the collected three-phase power grid terminal voltage and current data to obtain frequency, energy and waveform information containing a time tag, and then packaging the information into a WM-BUS data packet;
the power grid end transmission module is used for receiving the instruction of the monitoring center and transmitting the data packet of the data processing module to the monitoring center;
the monitoring end transmission module is used for sending an instruction to the power grid end and receiving data information transmitted by the power grid end;
the monitoring center is used for generating instructions, and displaying the power grid data received by the monitoring end transmission module through the upper computer in real time and dynamically to realize man-machine interaction.
In addition, the LCLCL type filter comprises a reactor and a capacitor, wherein the reactor and the capacitor are connected in series to form a series resonant circuit, after the series resonant circuit is connected in parallel with another capacitor, two branches are led out, one series reactor is connected with a power grid, the other series reactor is connected with the IGBT module, the harmonic wave is inhibited at the system switching frequency, and fundamental wave current and harmonic wave compensation current output by the IGBT module are guaranteed to be transmitted to the power grid, so that the LCLCLCL type filter has a good high-frequency harmonic wave bypass effect.
It should be noted that the parameters of the reactor and the capacitor in the lclclcl type filtering are 49.53 μh, 2 μf, 0.1 μh, and 2 μh in sequence, that is, the reactor with the parameter of 49.53 μh and the capacitor with the parameter of 2 μf are connected in series to form a series resonant circuit, after the series resonant circuit is connected in parallel with the capacitor with the parameter of 2 μf, two branches are led out, one reactor with the parameter of 0.1 μh in series is connected to the power grid, and the other reactor with the parameter of 2 μh in series is connected with the IGBT module.
In this embodiment, the lclclcl filter employs capacitive current proportional feedback to suppress the resonance peak of the system.
In this embodiment, the detection module uses AD7606 to collect the harmonic current data of the power grid.
In this embodiment, the control module uses a DSP chip with the model TMS32F28035, obtains the harmonic current data from the detection module, calculates the current to be compensated, and converts the current to an instruction current to control the light-isolation driving.
In this embodiment, the lclclcl active power filter adopts a control mode of proportional feedforward control, so as to achieve all-pass characteristics in a low frequency band of a resonant frequency, and achieve attenuation characteristics in a middle-high frequency band, thereby achieving the purposes of keeping low-frequency gain unchanged and compensating a system phase angle margin.
In this embodiment, the data processing module automatically generates the MCT vector by using the RTSG algorithm, that is, a data saving waveform recording mode based on interpolation, which is used for remote transmission and remote reconstruction of waveforms.
In this embodiment, the power grid end transmission module and the monitoring end transmission module use F8913D zigbee to send data to the internet of things, and receive data from the internet of things.
According to the intelligent harmonic management system based on the Internet of things, the RTSG algorithm is adopted for remote transmission and remote reconstruction of waveforms, the WM-BUS communication mode is used for communication between the power grid end and the monitoring center, the safe, stable and reliable operation of the power grid is ensured, the low-cost and high-efficiency measurement and transmission of power grid monitoring information in the Internet of things are realized, and meanwhile, the system can adapt to the change of power grid frequency.
Embodiment two: as shown in fig. 1 to 4, which are only one embodiment of the present invention, an intelligent harmonic treatment system based on the internet of things, wherein specific technical design details are as follows:
(1) RTSG algorithm for waveform remote transmission and reconstruction
Fig. 2 is a working block diagram of an RTSG algorithm for waveform remote transmission and reconstruction according to the present invention, wherein the RTSG algorithm is divided into two steps:
a. and (5) intelligent filtering. The iterative filtering characteristic of the RTSAL algorithm is utilized to realize low-pass filtering in the digital domain, MCT vectors are generated in the iterative process, and effective values of voltage and current can be calculated by utilizing the MCT vectors, so that the energy consumption parameter of the power grid is calculated.
b. And (5) calculating the power grid index. Calculating voltage spectrums at five frequencies (k is 40, 45, 50, 55 and 60Hz respectively) by adopting a Goertzel algorithm based on interpolation, and finding a spectrum maximum value by utilizing the interpolation algorithm to perform frequency estimation; calculating effective values of the voltage and the current; and storing time information of energy and frequency by adopting a time tag.
The present design uses a simplified calculation method using the effective value of the MCT vector, namely:
the RMS value is calculated using the MCT vector, and less data can be used, thereby reducing the time complexity of the algorithm and the computational burden of the MCU.
The RTSG algorithm processes the voltage and current waveforms of the power grid by using intelligent filtering formed by RTSAL iteration while measuring the frequency precision by using the Goertzel algorithm without reducing the frequency precision, improves the noise immunity of the system, and greatly reduces the time complexity of calculating the voltage and current effective values of the system, thereby reducing the energy/power calculation burden of the power grid and realizing the low-cost and high-efficiency measurement and transmission of the monitoring information of the power grid in the Internet of things. Meanwhile, the algorithm can adapt to the change of the frequency of the power grid, keeps higher accuracy in the calculation of the energy effective value, and avoids the problem of inaccurate energy metering evaluation caused by the fixed frequency constant of the ammeter.
The results of evaluating the frequency measurement relative error of the RTSG algorithm and the Goetzel algorithm as a function of SNR versus frequency are shown in fig. 3 and 4.
(2) WM-BUS communication method
The WM-BUS standard determines the way in which low-loss communications between smart meters occur.
According to the intelligent harmonic management system based on the Internet of things, the RTSG algorithm is adopted for remote transmission and remote reconstruction of waveforms, the WM-BUS communication mode is used for communication between the power grid end and the monitoring center, the safe, stable and reliable operation of the power grid is ensured, the low-cost and high-efficiency measurement and transmission of power grid monitoring information in the Internet of things are realized, and meanwhile, the system can adapt to the change of power grid frequency.
The above examples are only illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical scheme of the present invention will fall within the protection scope of the present invention without departing from the design concept of the present invention, and the technical content of the present invention is fully described in the claims.

Claims (7)

1. Intelligent harmonic governance system based on thing networking, its characterized in that includes:
the LCLCL type active power filter is connected with the three-phase power grid in parallel and is used for rapidly, stably and highly accurately tracking the power grid harmonic wave and reactive power, filtering the power grid harmonic wave and compensating the power grid reactive power;
the intelligent power grid based on WM-BUS communication is used for carrying out remote monitoring and management on the power grid;
the LCLCL type active power filter and the intelligent power grid based on WM-BUS communication are connected in series to form an intelligent harmonic treatment system based on the Internet of things, and the intelligent harmonic treatment system is connected in parallel to the three-phase power grid, so that the intelligent harmonic treatment system is suitable for power grid compensation and monitoring of medium-voltage heavy loads;
the LCLCL type active power filter comprises an LCLCL type filter, a detection module, a control module, an optical isolation driving module and an IGBT module, and forms a current control closed loop, wherein:
the LCLCL type filter is used for realizing the suppression effect on harmonic waves at the system switching frequency;
the detection module is used for detecting harmonic current of the three-phase power grid;
the control module is used for calculating instruction current according to the harmonic current data input by the detection module;
the light isolation driving module is used for controlling the output current of the IGBT module according to the instruction current output by the control module;
the intelligent power grid based on WM-BUS communication comprises a data processing module, a power grid end transmission module, a monitoring end transmission module and a monitoring center, wherein:
the data processing module is used for processing the collected three-phase power grid terminal voltage and current data to obtain frequency, energy and waveform information containing a time tag, and then packaging the information into a WM-BUS data packet;
the power grid end transmission module is used for receiving the instruction of the monitoring center and transmitting the data packet of the data processing module to the monitoring center;
the monitoring end transmission module is used for sending an instruction to the power grid end and receiving data information transmitted by the power grid end;
the monitoring center is used for generating instructions, and displaying the power grid data received by the monitoring end transmission module through the upper computer in real time and dynamically to realize man-machine interaction;
the data processing module automatically generates MCT vectors through an RTSG algorithm, namely a data saving type waveform recording mode based on interpolation, and is used for remote transmission and remote reconstruction of waveforms;
the RTSG algorithm for waveform remote transmission and reconstruction comprises the following steps:
the iterative filtering characteristic of the RTSAL algorithm is utilized to realize low-pass filtering in a digital domain, an MCT vector is generated in the iterative process, and the effective value of voltage and current is calculated by utilizing the MCT vector, so that the energy consumption parameter of the power grid is calculated;
calculating voltage spectrums at five frequencies of 40, 45, 50, 55 and 60Hz by adopting a Goertzel algorithm based on interpolation, and finding a spectrum maximum value by utilizing the interpolation algorithm to perform frequency estimation; calculating effective values of the voltage and the current; and storing time information of energy and frequency by adopting a time tag.
2. The intelligent harmonic remediation system based on the internet of things of claim 1, wherein: the LCLCL type filter comprises a reactor and a capacitor, wherein the reactor and the capacitor are connected in series to form a series resonant circuit, after the series resonant circuit is connected in parallel with another capacitor, two branches are led out, one series reactor is connected with a power grid, the other series reactor is connected with the IGBT module, the harmonic wave is inhibited at the system switching frequency, the fundamental wave current and the harmonic wave compensation current output by the IGBT module are ensured to be transmitted to the power grid, and the high-frequency harmonic wave bypass effect is good.
3. The intelligent harmonic remediation system based on the internet of things according to claim 2, wherein the lclclcl type filter employs capacitive current proportional feedback to suppress resonance peaks of the system.
4. The intelligent harmonic remediation system based on the internet of things of claim 1, wherein: the detection module uses AD7606 to collect power grid harmonic current data.
5. The intelligent harmonic remediation system based on the internet of things of claim 1, wherein: the control module uses a DSP chip with the model TMS32F28035, calculates the current to be compensated after acquiring the data of the harmonic current from the detection module, and converts the current to an instruction current to control the light barrier drive.
6. The intelligent harmonic remediation system based on the internet of things of claim 1, wherein: the LCLCL type active power filter adopts a control mode of proportional feedforward control and is used for realizing all-pass characteristics in a low frequency band of resonant frequency and attenuation characteristics in a middle-high frequency band, so that the purposes of keeping low-frequency gain unchanged and compensating the phase angle margin of a system are realized.
7. The intelligent harmonic remediation system based on the internet of things of claim 1, wherein: the power grid end transmission module and the monitoring end transmission module use F8913D zigbee to send data to the Internet of things and receive data from the Internet of things.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102624002A (en) * 2011-01-28 2012-08-01 江苏华研电力科技有限公司 Reactive power compensation and filtering integrated device
CN105119377A (en) * 2015-09-09 2015-12-02 国网福建晋江市供电有限公司 Super-ZigBee Internet of Things-based power grid intelligent monitoring system and method
CN108899907A (en) * 2018-07-11 2018-11-27 太原科技大学 Based on the LCLCL type Control Method of Active Power Filter for repeating sliding formwork control
CN110417803A (en) * 2019-08-06 2019-11-05 杭州继保南瑞电子科技有限公司 A kind of protection TT&C system with internet of things functional

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102624002A (en) * 2011-01-28 2012-08-01 江苏华研电力科技有限公司 Reactive power compensation and filtering integrated device
CN105119377A (en) * 2015-09-09 2015-12-02 国网福建晋江市供电有限公司 Super-ZigBee Internet of Things-based power grid intelligent monitoring system and method
CN108899907A (en) * 2018-07-11 2018-11-27 太原科技大学 Based on the LCLCL type Control Method of Active Power Filter for repeating sliding formwork control
CN110417803A (en) * 2019-08-06 2019-11-05 杭州继保南瑞电子科技有限公司 A kind of protection TT&C system with internet of things functional

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