CN114156902B - Reactive compensation intelligent management and control system for photovoltaic power generation residual electricity internet surfing - Google Patents
Reactive compensation intelligent management and control system for photovoltaic power generation residual electricity internet surfing Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 116
- 230000005611 electricity Effects 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 42
- 238000004364 calculation method Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 18
- 238000012544 monitoring process Methods 0.000 claims description 13
- 239000011159 matrix material Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000036555 skin type Effects 0.000 claims description 2
- 238000007726 management method Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000013500 data storage Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Classifications
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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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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
- 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
- H02J13/00002—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 monitoring
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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
- 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
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- 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
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
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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
- 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
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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
- 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
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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
- 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
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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 a reactive power compensation intelligent control system for surfing the Internet with residual electricity of photovoltaic power generation, wherein a photovoltaic power generation mechanism comprises a photovoltaic power generation plate, an MPPT module, a switch module, a controller and a reactive power calculation module; the photovoltaic power generation plate is connected to a power grid through the inverter and the LCL filter circuit; the reactive power calculation module is connected between the LCL filter circuit and the power grid, acquires a network current value and a network voltage value, calculates reactive power, and sends the calculated reactive power to the controller; and the controller judges whether the reactive power of the Internet surfing meets the requirement according to the obtained photovoltaic power generation current and voltage values, the Internet surfing current value and the Internet surfing voltage value, and if the reactive power of the Internet surfing is not met, the reactive power compensation device is started to compensate the reactive power of the Internet surfing. The system realizes reactive intelligent control of distributed photovoltaic power generation and improves the average power factor of photovoltaic internet surfing.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation internet surfing, in particular to a reactive compensation intelligent management and control system for photovoltaic power generation residual electricity internet surfing.
Background
The reactive compensation of the existing self-powered and residual electricity internet-surfing distributed photovoltaic power generation device mainly has the following problems:
the existing reactive compensation control device has no harmonic treatment device, is greatly influenced by harmonic waves, cannot be accurately compensated, and has low client power factor of installing a spontaneous self-use and residual electricity internet-surfing distributed photovoltaic power generation device.
The existing reactive power compensation control device can not monitor the running conditions of the self-power-consumption and residual electricity internet-surfing distributed photovoltaic power generation device, and the reactive power compensation capacity is the network load without reactive load and is inconsistent with the actual reactive power compensation requirement of a customer.
Disclosure of Invention
The invention provides a reactive power compensation intelligent control system for photovoltaic power generation residual electricity internet surfing, which realizes reactive power intelligent control of clients provided with self-powered and residual electricity internet surfing distributed photovoltaic power generation devices and improves the power factor of the clients.
Comprising the following steps: a plurality of photovoltaic power generation mechanisms;
the photovoltaic power generation mechanism comprises a photovoltaic power generation plate, an MPPT module, a switch module, a controller and a reactive power calculation module; the photovoltaic power generation plate is connected to a power grid through the inverter and the LCL filter circuit;
the output end of the photovoltaic power generation plate is connected with a capacitor C1;
the MPPT module is connected to the output end of the photovoltaic power generation plate; the output end of the MPPT module is connected with the first input end of the switch module; the second input end of the switch module is connected with a reference value;
the output end of the switch module is connected with the controller; the reactive power calculation module is connected between the LCL filter circuit and the power grid, acquires a network current value and a network voltage value, calculates reactive power, and sends the calculated reactive power to the controller;
and the controller judges whether the reactive power of the Internet surfing meets the requirement according to the obtained photovoltaic power generation current and voltage values, the Internet surfing current value and the Internet surfing voltage value, and if the reactive power of the Internet surfing is not met, the reactive power compensation device is started to compensate the reactive power of the Internet surfing.
It should be further noted that, the inverter increases the voltage output by the photovoltaic power generation panel and reaches a preset voltage value;
the inverter adopts an electric skin type full-bridge inverter circuit which is connected with a power grid through an LCL filter circuit.
The LCL filter circuit is used for converting the PWM voltage waveform output by the inverter into continuous current and integrating the continuous current into a power grid;
the LCL filter circuit is also used for filtering out higher switching frequency in the system, keeping high resistance to higher harmonic waves in the system and keeping low resistance effect to harmonic current.
It should be further noted that, the system may further be provided with a harmonic detection circuit pair for detecting the harmonic content in the nonlinear load, and sending the harmonic content as a command current signal to the controller, where the controller is a DSP processing chip, and controls the on/off of the IGBT switching tube of the inverter to compensate the current harmonic.
The controller adopts a PWM control mode to control the effective value of the current and realize reactive compensation; the controller generates a PWM pulse algorithm which can trigger the reactive compensation device to generate reactive compensation current required by photovoltaic surfing.
The controller uses a triangular carrier control algorithm to control the difference value between the instruction current and the actual compensation current as a control signal, and compares the control signal with the high-frequency triangular wave after an adjustment link;
the controller judges the intersection point of the difference value and the triangular wave and determines the on and off moments of the inverter.
It is further noted that each photovoltaic power generation mechanism is in communication connection with a distributed photovoltaic intelligent terminal, and the distributed photovoltaic intelligent terminal obtains the power generation state and the internet surfing data of each photovoltaic power generation mechanism and displays the power generation state and the internet surfing data for monitoring personnel to check;
the distributed photovoltaic intelligent terminal is also in communication connection with the photovoltaic power generation monitoring server, and sends the power generation state and the internet surfing data of the photovoltaic power generation mechanism to the upper computer.
The photovoltaic power generation monitoring server is used for acquiring operation data of each photovoltaic power generation mechanism, configuring and forming a photovoltaic power generation mechanism loop impedance matrix under preset frequency according to preset conditions, decomposing photovoltaic power generation characteristic values of an inverse matrix of the photovoltaic power generation mechanism loop impedance matrix, and recording absolute values of all characteristic values in the photovoltaic power generation process; traversing all possible harmonic resonance frequencies to form absolute value distribution conditions of characteristic values in the photovoltaic power generation process;
judging whether harmonic waves exist in the photovoltaic power generation process according to the absolute value of each characteristic value.
It should be further noted that the photovoltaic power generation mechanism further includes: the current quick-break protection device is used for cutting off the photovoltaic grid-connected switch and the photovoltaic incoming line switch when a short circuit fault occurs between the power grid and the photovoltaic power generation mechanism.
It should be further noted that the photovoltaic power generation mechanism further includes: fault disconnection means and anti-islanding means;
the fault disconnection device is used for realizing fault disconnection between the photovoltaic power supply and the power grid.
The anti-islanding device is used for monitoring the islanding state of the photovoltaic power generation mechanism, and when the photovoltaic power generation mechanism enters the islanding state, the photovoltaic power generation mechanism is immediately disconnected from the power grid.
From the above technical scheme, the invention has the following advantages:
the reactive power compensation intelligent control system for the photovoltaic power generation residual electricity internet surfing provided by the invention realizes reactive power intelligent control of distributed photovoltaic power generation, and improves the average power factor of the photovoltaic internet surfing.
According to the intelligent reactive power compensation control system for the photovoltaic power generation residual electricity internet surfing, disclosed by the invention, the resonance elimination and rectification module is additionally arranged in the existing reactive power compensation sampling loop, so that the accuracy of data sampling of the existing device is improved, the control accuracy of the existing reactive power compensation device is improved, and the power factor of a customer is improved.
The system realizes the direction difference of sampling data by adding the discrimination in the existing reactive compensation sampling loop, and accurately carries out reactive device management and control when the self-power-consumption and residual electricity internet-surfing distributed photovoltaic power generation device normally generates electricity when a customer does not have a power load.
And reactive power is accurately switched by sharing the distributed photovoltaic data. The photovoltaic power generation internet data can be subjected to harmonic elimination and rectification. And reactive compensation is accurately performed. And the data sharing and the data monitoring functions are realized.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a reactive power compensation intelligent control system for surfing the internet with residual electricity of photovoltaic power generation.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a reactive power compensation intelligent management and control system for photovoltaic power generation residual electricity internet surfing, which is shown in fig. 1 and comprises the following components: a plurality of photovoltaic power generation mechanisms;
the photovoltaic power generation mechanism comprises a photovoltaic power generation plate 1, an MPPT module 2, a switch module 3, a controller 4 and a reactive power calculation module 5; the photovoltaic power generation panel 1 is connected to a power grid through an inverter 6 and an LCL filter circuit 7; the output end of the photovoltaic power generation plate 1 is connected with a capacitor C1;
the MPPT module 2 is connected to the output end of the photovoltaic power generation panel 1; the output end of the MPPT module 2 is connected with the first input end of the switch module 3; the second input end of the switch module 3 is connected with a reference value; the output end of the switch module 3 is connected with the controller 4; the reactive power calculation module 5 is connected between the LCL filter circuit 7 and the power grid, acquires a network current value and a network voltage value, calculates reactive power, and sends the calculated reactive power to the controller 4; and the controller 4 judges whether the reactive power of the internet access meets the requirement according to the obtained photovoltaic power generation current and voltage values, the internet access current value and the internet access voltage value, and if the reactive power of the internet access does not meet the requirement, the reactive power compensation device is started to compensate the reactive power of the internet access.
As an embodiment of the present invention, the inverter 6 increases the voltage output from the photovoltaic power generation panel 1 and reaches a preset voltage value; the inverter 6 adopts an electrodermal full-bridge inverter circuit, and is connected with a power grid through an LCL filter circuit 7.
The LCL filter circuit 7 is used for converting the PWM voltage waveform output by the inverter 6 into continuous current and integrating the continuous current into a power grid; the LCL filter circuit 7 is also used for filtering out higher switching frequency in the system, maintaining high impedance to higher harmonics in the system, and maintaining low impedance effect to harmonic current. The LCL filter circuit 7 outputs harmonic current to compensate for harmonics generated by nonlinear loads in the system.
The system can also be provided with a harmonic detection circuit pair for detecting the harmonic content in the nonlinear load and sending the harmonic content as an instruction current signal to the controller 4, wherein the controller 4 is a DSP processing chip for controlling the on-off of the IGBT switching tube of the inverter 6 and compensating the current harmonic.
The controller 4 adopts a PWM control mode to control the effective value of the current and realize reactive compensation; the controller 4 generates a PWM pulse algorithm that triggers the reactive compensation device to generate reactive compensation current required for photovoltaic surfing.
The system of the invention can realize the algorithm of pulse width modulation control of current real-time tracking control.
The controller 4 uses a triangular carrier control algorithm to control the difference value between the instruction current and the actual compensation current as a control signal, and compares the control signal with the high-frequency triangular wave after an adjustment link;
the controller 4 determines the intersection point of the difference and the triangular wave, and determines the on and off timings of the inverter 6.
As an embodiment of the invention, each photovoltaic power generation mechanism is in communication connection with a distributed photovoltaic intelligent terminal, and the distributed photovoltaic intelligent terminal acquires the power generation state and the internet surfing data of each photovoltaic power generation mechanism and displays the power generation state and the internet surfing data for monitoring personnel to check; the distributed photovoltaic intelligent terminal is also in communication connection with the photovoltaic power generation monitoring server, and sends the power generation state and the internet surfing data of the photovoltaic power generation mechanism to the upper computer.
The photovoltaic power generation monitoring server is used for acquiring operation data of each photovoltaic power generation mechanism, configuring and forming a photovoltaic power generation mechanism loop impedance matrix under preset frequency according to preset conditions, decomposing photovoltaic power generation characteristic values of an inverse matrix of the photovoltaic power generation mechanism loop impedance matrix, and recording absolute values of all characteristic values in the photovoltaic power generation process; traversing all possible harmonic resonance frequencies to form absolute value distribution conditions of characteristic values in the photovoltaic power generation process; judging whether harmonic waves exist in the photovoltaic power generation process according to the absolute value of each characteristic value.
As an embodiment of the present invention, the photovoltaic power generation mechanism further includes: the current quick-break protection device, the fault disconnection device and the island prevention device; the current quick-break protection device is used for cutting off the photovoltaic grid-connected switch and the photovoltaic incoming line switch when a short circuit fault occurs between the power grid and the photovoltaic power generation mechanism.
The fault disconnection device is used for realizing fault disconnection between the photovoltaic power supply and the power grid.
The anti-islanding device is used for monitoring the islanding state of the photovoltaic power generation mechanism, and when the photovoltaic power generation mechanism enters the islanding state, the photovoltaic power generation mechanism is immediately disconnected from the power grid.
The reactive compensation intelligent control system for photovoltaic power generation residual electricity internet surfing can be realized in hardware, software, firmware or any combination thereof. The various features described are modules, units, or components that may be implemented together in an integrated logic device or separately as discrete but interoperable logic devices or other hardware devices. In some cases, various features of the electronic circuit may be implemented as one or more integrated circuit devices, such as an integrated circuit chip or chipset.
The reactive compensation intelligent management and control system for photovoltaic power generation residual electricity internet surfing can be used as a processor or an integrated circuit device, such as an integrated circuit chip or a chip set. Alternatively or additionally, if implemented in software or firmware, the techniques may implement a data storage medium readable at least in part by a computer comprising instructions that, when executed, cause a processor to perform one or more of the methods described above. For example, a computer-readable data storage medium may store instructions such as those executed by a processor.
The controller 4 includes one or more processor implementations, such as one or more Digital Signal Processors (DSPs), general purpose microprocessors, application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs), or other equivalents to integrated or discrete logic circuitry. Thus, the term "processor," as used herein, may refer to any of the foregoing structure or any other structure as being better suited for implementation of the techniques described herein. Additionally, in some aspects, the functionality described in this disclosure may be provided in software modules and hardware modules.
The system implements the method and apparatus of the present invention in a number of ways. For example, the methods and apparatus of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, firmware. The above-described sequence of steps for the method is for illustration only, and the steps of the method of the present invention are not limited to the sequence specifically described above unless specifically stated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The utility model provides a surplus electricity of photovoltaic power generation is reactive compensation intelligence management and control system on net, its characterized in that includes: a plurality of photovoltaic power generation mechanisms;
the photovoltaic power generation mechanism comprises a photovoltaic power generation plate, an MPPT module, a switch module, a controller and a reactive power calculation module; the photovoltaic power generation plate is connected to a power grid through the inverter and the LCL filter circuit;
the output end of the photovoltaic power generation plate is connected with a capacitor C1;
the MPPT module is connected to the output end of the photovoltaic power generation plate; the output end of the MPPT module is connected with the first input end of the switch module; the second input end of the switch module is connected with a reference value;
the output end of the switch module is connected with the controller; the reactive power calculation module is connected between the LCL filter circuit and the power grid, acquires a network current value and a network voltage value, calculates reactive power, and sends the calculated reactive power to the controller;
the controller judges whether the reactive power of the internet is required to be met or not according to the obtained photovoltaic power generation current and voltage values, the internet current value and the internet voltage value, and if the reactive power of the internet is not required to be met, the reactive power compensation device is started to compensate the reactive power of the internet;
the inverter increases the voltage output by the photovoltaic power generation plate and reaches a preset voltage value;
the inverter adopts an electric skin type full-bridge inverter circuit which is connected with a power grid through an LCL filter circuit;
the LCL filter circuit is used for converting the PWM voltage waveform output by the inverter into continuous current and integrating the continuous current into a power grid;
the LCL filter circuit is also used for filtering out higher switching frequency in the system, keeping high resistance to higher harmonic waves in the system and keeping low resistance effect to harmonic current;
the system can also be provided with a harmonic detection circuit pair for detecting harmonic content in a nonlinear load and sending the harmonic content as an instruction current signal to a controller, wherein the controller is a DSP processing chip for controlling the on and off of an IGBT switching tube of the inverter and compensating current harmonic;
the photovoltaic power generation monitoring server is used for acquiring operation data of each photovoltaic power generation mechanism, configuring and forming a photovoltaic power generation mechanism loop impedance matrix under preset frequency according to preset conditions, decomposing photovoltaic power generation characteristic values of an inverse matrix of the photovoltaic power generation mechanism loop impedance matrix, and recording absolute values of all characteristic values in the photovoltaic power generation process; traversing all possible harmonic resonance frequencies to form absolute value distribution conditions of characteristic values in the photovoltaic power generation process;
judging whether harmonic waves exist in the photovoltaic power generation process according to the absolute value of each characteristic value.
2. The reactive power compensation intelligent control system for photovoltaic power generation residual electricity internet surfing according to claim 1 wherein,
the controller adopts a PWM control mode to control the effective value of the current and realize reactive compensation; the controller generates a PWM pulse algorithm which can trigger the reactive compensation device to generate reactive compensation current required by photovoltaic surfing.
3. The reactive power compensation intelligent control system for photovoltaic power generation residual electricity internet surfing according to claim 2 wherein,
the controller uses a triangular carrier control algorithm to control the difference value between the instruction current and the actual compensation current as a control signal, and compares the control signal with the high-frequency triangular wave after an adjustment link;
the controller judges the intersection point of the difference value and the triangular wave and determines the on and off moments of the inverter.
4. The reactive power compensation intelligent control system for photovoltaic power generation residual electricity internet surfing according to claim 1 wherein,
each photovoltaic power generation mechanism is in communication connection with a distributed photovoltaic intelligent terminal, and the distributed photovoltaic intelligent terminal acquires the power generation state and the internet surfing data of each photovoltaic power generation mechanism and displays the power generation state and the internet surfing data for monitoring staff to check;
the distributed photovoltaic intelligent terminal is also in communication connection with the photovoltaic power generation monitoring server, and sends the power generation state and the internet surfing data of the photovoltaic power generation mechanism to the upper computer.
5. The reactive power compensation intelligent control system for photovoltaic power generation residual electricity internet surfing according to claim 1 wherein,
the photovoltaic power generation mechanism further includes: the current quick-break protection device is used for cutting off the photovoltaic grid-connected switch and the photovoltaic incoming line switch when a short circuit fault occurs between the power grid and the photovoltaic power generation mechanism.
6. The reactive power compensation intelligent control system for photovoltaic power generation residual electricity internet surfing according to claim 1 wherein,
the photovoltaic power generation mechanism further includes: fault disconnection means and anti-islanding means;
the fault disconnection device is used for realizing fault disconnection between the photovoltaic power supply and the power grid;
the anti-islanding device is used for monitoring the islanding state of the photovoltaic power generation mechanism, and when the photovoltaic power generation mechanism enters the islanding state, the photovoltaic power generation mechanism is immediately disconnected from the power grid.
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