CN114156902A - Reactive compensation intelligent management and control system for photovoltaic power generation surplus power internet - Google Patents
Reactive compensation intelligent management and control system for photovoltaic power generation surplus power internet Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 claims description 13
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- 238000004891 communication Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
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- 230000036555 skin type Effects 0.000 claims description 3
- 238000007726 management method Methods 0.000 description 7
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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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- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The invention provides a reactive compensation intelligent management and control system for surplus power online of photovoltaic power generation, wherein a photovoltaic power generation mechanism comprises a photovoltaic power generation board, an MPPT module, a switch module, a controller and a reactive power calculation module; the photovoltaic power generation board is connected to a power grid through an inverter and an LCL filter circuit; the reactive power calculation module is connected between the LCL filter circuit and the power grid, acquires an internet surfing current value and an internet surfing voltage value, calculates the reactive power and sends the calculated reactive power to the controller; and the controller judges whether the reactive power of the internet meets the requirements or not according to the acquired photovoltaic power generation current and voltage values and the internet current value and the internet voltage value, and starts the reactive power compensation device to compensate the reactive power of the internet if the reactive power of the internet does not meet the requirements. The system realizes reactive intelligent control of distributed photovoltaic power generation and improves the average power factor of photovoltaic internet access.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation internet surfing, in particular to a reactive power compensation intelligent control system for photovoltaic power generation surplus power internet surfing.
Background
The existing spontaneous self-using and surplus electricity internet distributed photovoltaic power generation device mainly has the following problems:
the existing reactive compensation management and control device is free of harmonic suppression devices, is greatly affected by harmonic waves, cannot compensate accurately, and causes low power factor of clients provided with the self-generation self-use and surplus electricity internet distributed photovoltaic power generation devices.
The existing reactive compensation management and control device cannot monitor the running conditions of the self-generation self-use and residual electricity internet-surfing distributed photovoltaic power generation device, and the input reactive compensation capacity is the unnecessary reactive load of the network load and is inconsistent with the actual reactive compensation requirement of a client.
Disclosure of Invention
The invention provides a reactive power compensation intelligent control system for photovoltaic power generation surplus power internet, which realizes reactive power intelligent control of a client provided with a self-generation self-use and surplus power internet distributed photovoltaic power generation device and improves the power factor of the client.
The method comprises the following steps: a plurality of photovoltaic power generation mechanisms;
the photovoltaic power generation mechanism comprises a photovoltaic power generation board, an MPPT module, a switch module, a controller and a reactive power calculation module; the photovoltaic power generation board is connected to a power grid through an inverter and an LCL filter circuit;
the output end of the photovoltaic power generation board is connected with a capacitor C1;
the MPPT module is connected to the output end of the photovoltaic power generation panel; 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 an internet surfing current value and an internet surfing voltage value, calculates the reactive power and sends the calculated reactive power to the controller;
and the controller judges whether the reactive power of the internet meets the requirements or not according to the acquired photovoltaic power generation current and voltage values and the internet current value and the internet voltage value, and starts the reactive power compensation device to compensate the reactive power of the internet if the reactive power of the internet does not meet the requirements.
It should be further noted that the inverter raises the voltage output by the photovoltaic power generation panel and reaches a preset voltage value;
the inverter adopts an electronic skin type full-bridge inverter circuit and 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 amount and merging the continuous current amount into a power grid;
the LCL filter circuit is also used for filtering the higher switching frequency in the system, keeping high resistance on higher harmonics in the system and maintaining the low resistance effect on harmonic current.
It should be further noted that a harmonic detection circuit can be further arranged in the system to detect the harmonic content in the nonlinear load and send the harmonic content to the controller as an instruction current signal, and the controller is a DSP processing chip and controls the on and off of the inverter IGBT switching tube to compensate the current harmonic.
It should be further noted that the controller adopts a PWM control mode to control the current effective value and implement reactive compensation; the controller generates a PWM pulse algorithm to trigger the reactive compensation device to generate reactive compensation current required by photovoltaic internet access.
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 the control signal is compared with the high-frequency triangular wave after passing through an adjusting link;
and the controller judges the intersection point of the difference value and the triangular wave and determines the on-off time of the inverter.
It should be further noted that each photovoltaic power generation mechanism is in communication connection with a distributed photovoltaic intelligent terminal, and the distributed photovoltaic intelligent terminals acquire the power generation state and the internet data of each photovoltaic power generation mechanism and display the power generation state and the internet data for the 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 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 a preset frequency according to a preset condition, decomposing photovoltaic power generation characteristic values of an inverse matrix of the photovoltaic power generation mechanism loop impedance matrix, and recording absolute values of the characteristic values in the photovoltaic power generation process; traversing all frequencies which are possible to generate harmonic resonance to form the absolute value distribution condition of the characteristic value in the photovoltaic power generation process;
and 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 a power grid and the photovoltaic power generation mechanism.
It should be further noted that the photovoltaic power generation mechanism further includes: a fault disconnection device and an anti-islanding device;
and the fault splitting device is used for realizing fault splitting 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 islanding device is immediately disconnected from the power grid.
According to the technical scheme, the invention has the following advantages:
the reactive compensation intelligent control system for photovoltaic power generation surplus power internet access provided by the invention realizes reactive intelligent control of distributed photovoltaic power generation and improves the average power factor of photovoltaic internet access.
According to the photovoltaic power generation surplus power online reactive compensation intelligent control system, the harmonic elimination and rectification modules are additionally arranged in the existing reactive compensation sampling loop, so that the accuracy of data sampling of the existing device is improved, the control accuracy of the existing reactive compensation device is improved, and the power factor of a client is improved.
The system realizes the direction difference of sampling data by adding the judgment in the existing reactive compensation sampling loop, and when a client does not have a power load, the system accurately controls the reactive power device when the self-generation self-use and residual power internet distributed photovoltaic power generation device normally generates power.
By means of sharing with distributed photovoltaic data, reactive power is accurately switched. The harmonic elimination and rectification can be carried out on the photovoltaic power generation internet data. And accurately performing reactive compensation. And the functions of data sharing and data monitoring are also realized.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a reactive power compensation intelligent management and control system for photovoltaic power generation surplus power internet surfing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a reactive compensation intelligent management and control system for photovoltaic power generation surplus power internet surfing, as shown in figure 1, comprising: 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 panel 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 an internet surfing current value and an internet surfing 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 online meets the requirements or not according to the acquired photovoltaic power generation current and voltage values and the online current value and the online voltage value, and starts the reactive power compensation device to compensate the reactive power of the online if the reactive power of the online does not meet the requirements.
As an embodiment of the present invention, the inverter 6 raises the voltage output by the photovoltaic power generation panel 1 and reaches a preset voltage value; the inverter 6 adopts an electronic skin type 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 amount and merging the continuous current amount into the power grid; the LCL filter circuit 7 is also used for filtering the higher switching frequency in the system, keeping high resistance to the higher harmonic in the system and maintaining the low resistance effect to the harmonic current. The LCL filter circuit 7 outputs harmonic current to compensate the harmonic generated by the nonlinear load in the system.
The system of the invention can also be provided with a harmonic detection circuit for detecting the harmonic content in the nonlinear load and sending the harmonic content to the controller 4 as an instruction current signal, wherein the controller 4 is a DSP processing chip and controls the on and off of an IGBT switching tube of the inverter 6 to compensate the current harmonic.
The controller 4 controls the current effective value in a PWM control mode and realizes reactive compensation; the controller 4 generates a PWM pulse algorithm to trigger the reactive compensation device to generate reactive compensation current required by photovoltaic internet access.
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 the control signal is compared with the high-frequency triangular wave after passing through an adjusting link;
the controller 4 determines the intersection point of the difference value and the triangular wave and determines the on and off time 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 terminals acquire the power generation state and the internet surfing data of each photovoltaic power generation mechanism and display 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 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 a preset frequency according to a preset condition, decomposing photovoltaic power generation characteristic values of an inverse matrix of the photovoltaic power generation mechanism loop impedance matrix, and recording absolute values of the characteristic values in the photovoltaic power generation process; traversing all frequencies which are possible to generate harmonic resonance to form the absolute value distribution condition of the characteristic value in the photovoltaic power generation process; and 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 device comprises a current quick-break protection device, a fault disconnection device and an anti-islanding device; the current quick-break protection device is used for cutting off the photovoltaic grid-connected switch and the photovoltaic incoming line switch when short-circuit faults occur between a power grid and the photovoltaic power generation mechanism.
And the fault splitting device is used for realizing fault splitting 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 islanding device is immediately disconnected from the power grid.
The reactive compensation intelligent management and control system for photovoltaic power generation surplus power internet surfing can be realized in hardware, software, firmware or any combination of the hardware, the software and the firmware. Various features are described as 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 an electronic circuit may be implemented as one or more integrated circuit devices, such as an integrated circuit chip or chipset.
The photovoltaic power generation surplus power online reactive compensation intelligent management and control system 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 above-described methods. For example, a computer-readable data storage medium may store instructions that are executed, such as by a processor.
The controller 4 includes one or more processors executing, for example, one or more Digital Signal Processors (DSPs), general purpose microprocessors, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), or other equivalent integrated or discrete logic circuitry. Thus, the term "processor," as used herein, may refer to any of the foregoing structure or any other structure more suitable for implementing the techniques described herein. In addition, 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, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method 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 (10)
1. The utility model provides a reactive compensation intelligence management and control system of surplus electricity of photovoltaic power generation online which characterized in that includes: a plurality of photovoltaic power generation mechanisms;
the photovoltaic power generation mechanism comprises a photovoltaic power generation board, an MPPT module, a switch module, a controller and a reactive power calculation module; the photovoltaic power generation board is connected to a power grid through an inverter and an LCL filter circuit;
the output end of the photovoltaic power generation board is connected with a capacitor C1;
the MPPT module is connected to the output end of the photovoltaic power generation panel; 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 an internet surfing current value and an internet surfing voltage value, calculates the reactive power and sends the calculated reactive power to the controller;
and the controller judges whether the reactive power of the internet meets the requirements or not according to the acquired photovoltaic power generation current and voltage values and the internet current value and the internet voltage value, and starts the reactive power compensation device to compensate the reactive power of the internet if the reactive power of the internet does not meet the requirements.
2. The intelligent management and control system for the reactive compensation of the photovoltaic power generation surplus power grid according to claim 1,
the inverter raises the voltage output by the photovoltaic power generation panel and reaches a preset voltage value;
the inverter adopts an electronic skin type full-bridge inverter circuit and is connected with a power grid through an LCL filter circuit.
3. The intelligent management and control system for the reactive compensation of the photovoltaic power generation surplus power grid according to claim 1,
the LCL filter circuit is used for converting the PWM voltage waveform output by the inverter into continuous current amount and merging the continuous current amount into a power grid;
the LCL filter circuit is also used for filtering the higher switching frequency in the system, keeping high resistance on higher harmonics in the system and maintaining the low resistance effect on harmonic current.
4. The intelligent management and control system for the reactive compensation of the photovoltaic power generation surplus power grid according to claim 1,
the system can also be provided with a harmonic detection circuit for detecting the harmonic content in the nonlinear load and sending the harmonic content to the controller as an instruction current signal, wherein the controller is a DSP processing chip and controls the on and off of an IGBT switching tube of the inverter to compensate current harmonics.
5. The intelligent management and control system for the reactive compensation of the photovoltaic power generation surplus power grid according to claim 1,
the controller adopts a PWM control mode to control the effective value of current and realize reactive compensation; the controller generates a PWM pulse algorithm to trigger the reactive compensation device to generate reactive compensation current required by photovoltaic internet access.
6. The intelligent management and control system for the reactive compensation of the photovoltaic power generation surplus power grid according to claim 5,
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 the control signal is compared with the high-frequency triangular wave after passing through an adjusting link;
and the controller judges the intersection point of the difference value and the triangular wave and determines the on-off time of the inverter.
7. The intelligent management and control system for the reactive compensation of the photovoltaic power generation surplus power grid according to claim 1,
each photovoltaic power generation mechanism is in communication connection with a distributed photovoltaic intelligent terminal, and the distributed photovoltaic intelligent terminals acquire the power generation state and the internet surfing data of each photovoltaic power generation mechanism and display 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 data of the photovoltaic power generation mechanism to the upper computer.
8. The intelligent management and control system for the reactive compensation of the photovoltaic power generation surplus power grid according to claim 7,
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 a preset frequency according to a preset condition, decomposing photovoltaic power generation characteristic values of an inverse matrix of the photovoltaic power generation mechanism loop impedance matrix, and recording absolute values of the characteristic values in the photovoltaic power generation process; traversing all frequencies which are possible to generate harmonic resonance to form the absolute value distribution condition of the characteristic value in the photovoltaic power generation process;
and judging whether harmonic waves exist in the photovoltaic power generation process according to the absolute value of each characteristic value.
9. The intelligent management and control system for the reactive compensation of the photovoltaic power generation surplus power grid according to claim 8,
photovoltaic power generation mechanism still 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 a power grid and the photovoltaic power generation mechanism.
10. The intelligent management and control system for the reactive compensation of the photovoltaic power generation surplus power grid according to claim 1 or 2,
photovoltaic power generation mechanism still includes: a fault disconnection device and an anti-islanding device;
the fault splitting device is used for realizing fault splitting 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 islanding device is immediately disconnected from the power grid.
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