CN114421621A - Power regulating system of hybrid energy storage photovoltaic power station - Google Patents

Power regulating system of hybrid energy storage photovoltaic power station Download PDF

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CN114421621A
CN114421621A CN202210067080.7A CN202210067080A CN114421621A CN 114421621 A CN114421621 A CN 114421621A CN 202210067080 A CN202210067080 A CN 202210067080A CN 114421621 A CN114421621 A CN 114421621A
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power
module
information
inverter
regulation
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余伟
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Zhejiang Business College
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Zhejiang Business College
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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
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • 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
    • Y04S10/12—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
    • 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
    • Y04S10/14—Energy storage units

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention provides a power regulating system of a hybrid energy storage photovoltaic power station, which comprises: the device comprises a monitoring module, a calculation and analysis module, a power regulation module and a remote management module; the monitoring module is used for monitoring electrical state parameters and safety information of the power station in the power generation process; the calculation analysis module is electrically connected with the remote management module and is used for receiving adjustment instruction information, judging whether the electrical state parameters are abnormal or not and sending an adjustment signal to the power adjustment module; the power adjusting module is used for adjusting the power generation power and the starting time and distributing the power of each inverter; the remote management module is used for modifying and managing the power regulation process and the regulation parameters and alarming and operation and maintenance management under the condition of abnormal faults.

Description

Power regulating system of hybrid energy storage photovoltaic power station
Technical Field
The invention relates to the technical field of electric power, in particular to a power regulating system of a hybrid energy storage photovoltaic power station.
Background
Solar energy is used as a green new energy source and applied to the field of power generation, and the problems of energy pressure and environmental pollution are reduced to a greater extent. In recent years, photovoltaic power generation has been developed from special power utilization to large-scale grid-connected solar photovoltaic power generation. Because the photovoltaic power generation is greatly influenced by sunlight irradiation, the output power of a photovoltaic system can greatly fluctuate when the illumination is changed violently, and the photovoltaic power generation system has the characteristics of unstable power, output time interval and the like, so that problems are brought to planning and operation scheduling of a power grid.
At present, a power control system is mostly configured in a photovoltaic power station to carry out power regulation, namely, the photovoltaic power station AGC directly carries out power regulation on each inverter through in-station AGC software, but the regulation mode has the problems that the inverter power control instruction response speed is insufficient, the power regulation speed is slow, and the requirement of power grid frequency modulation and voltage regulation cannot be met.
In summary, it is an urgent need to solve the problem of the art to provide a power regulation system of a hybrid energy storage photovoltaic power station, which can flexibly control the regulation speed of an inverter, and improve the regulation capacity of the photovoltaic power station while enabling the photovoltaic power station to have a fast and accurate regulation capability by using a power balance method.
Disclosure of Invention
In view of the above-mentioned problems and needs, the present solution provides a power regulation system for a hybrid energy storage photovoltaic power plant, which can solve the above technical problems due to the following technical solutions.
In order to achieve the purpose, the invention provides the following technical scheme: a power conditioning system for a hybrid energy storage photovoltaic power plant, comprising: the device comprises a monitoring module, a calculation and analysis module, a power regulation module and a remote management module;
the monitoring module is used for monitoring electrical state parameters and safety information of the power station in the power generation process;
the calculation analysis module is electrically connected with the remote management module and is used for receiving adjustment instruction information, judging whether the electrical state parameters are abnormal or not and sending an adjustment signal to the power adjustment module;
the power adjusting module is used for adjusting the power generation power and the starting time and distributing the power of each inverter;
and the remote management module is used for modifying and managing the power regulation process and the regulation parameters and alarming and managing operation and maintenance under the abnormal condition of the fault.
Furthermore, the monitoring module comprises a data detection module, a dividing module and an information transmission module;
the data detection module comprises a current transformer for detecting current information of a grid-connected point and a voltage transformer for detecting voltage information of the grid-connected point;
the dividing module is used for dividing a plurality of inverters in the station into a common inverter and a quick adjusting inverter according to the uplink dividing parameter information, and numbering and describing the common inverter and the quick adjusting inverter;
the data detection module and the dividing module are electrically connected with the information transmission module, and the information transmission module is used for sending detection data to the calculation analysis module and receiving dividing parameter information.
Furthermore, the monitoring module further comprises a temperature detection module and a video monitoring module for detecting the temperature change information of the inverter;
the temperature detection module comprises a plurality of temperature detectors and a controller, each temperature detector transmits detected temperature information to the controller according to a certain frequency, the controller calculates an average value of the temperature information in a preset period, compares the average value with a safety temperature threshold value, and sends alarm information to the remote management module through the calculation and analysis module if the average value exceeds the safety temperature threshold value;
the video monitoring module is used for carrying out safety monitoring on the surrounding environment of the photovoltaic power station, the video monitoring module comprises a video acquisition device and an abnormal behavior identification module, the video acquisition device carries out image preprocessing on acquired environment image information and then sends the processed environment image information to the abnormal behavior identification module, the abnormal behavior identification module carries out feature extraction on the image by utilizing a person abnormal behavior identification algorithm based on deep learning, extracted information is compared with person abnormal feature information stored in an abnormal information database, and whether abnormal behaviors occur or not is judged according to a comparison result.
Further, the calculation analysis module comprises a power prediction module, a power calculation module and an abnormality judgment module;
the power prediction module is used for predicting the maximum active power p of the ith inverter of the photovoltaic power stationmaxAnd minimum starting power pminThe ith inverter is a reference inverter which always operates in a maximum power tracking mode and outputs active power outwards but does not participate in active regulation, and the active output of the photovoltaic power station is po＝p1+p2+pmax；
The power calculation module comprises a real-time calculation module and a period calculation module, the real-time calculation module is used for calculating the real-time power of the grid-connected inverter according to the collected current information and voltage information of the grid-connected point, the period calculation module is used for calculating the total power value of the common inverter and the rapid-adjustment inverter in an adjustment period, and the total power value
Figure BDA0003480580950000031
Wherein p isiuRepresenting the output power of a regulation cycle, N, in the ith inverter of the u-th classuThe value of u is 1 or 2 for the number of the u-type inverters, and the power calculation module sends real-time power information and periodic power information to the power regulation module to be used as a regulation feedback value for power closed-loop regulation;
and the abnormity judgment module is used for judging whether the actual active power value of the photovoltaic power station exceeds the set active power regulation and control range or not and giving a safety alarm to the abnormal condition.
Furthermore, the abnormity judgment module comprises a comparison module and a safety alarm module;
the comparison module compares the actual active power value of the photovoltaic power station with a set active power control threshold of the photovoltaic power station, and if the actual active power value of the photovoltaic power station exceeds the active power control threshold range of the photovoltaic power station, alarm information is sent to the safety alarm module;
the safety alarm module generates a multi-mode alarm control signal according to alarm information, the alarm device carries out on-site acousto-optic alarm and remote alarm according to the alarm control signals in different modes, the actual active power value of the photovoltaic power station is repeatedly detected and calculated within a period of time, whether the actual active power value exceeds a set active power regulation range is judged, if the actual active power value does not exceed the set active power regulation range, the alarm is relieved, otherwise, the safety alarm module sends a control instruction to the removal control device, the removal control device removes a photovoltaic power generation feeder line, and the electrical state information, the alarm information, the station number and the location information of the current photovoltaic power station are uploaded to the remote management module.
Further, the power regulation module comprises an instruction receiving module and a regulation balance module, and the instruction receiving module is used for receiving an uplink active control instruction; the adjusting and balancing module is electrically connected with the instruction receiving module, and controls the rapid adjusting inverter to enable the output power of the photovoltaic power station to meet an active instruction in a short time, controls the common inverter to be in an operating state, and performs power balance on the inverters with different adjusting speeds.
Further, the adjusting and balancing module comprises an adjusting parameter calculating module and a balancing module; the adjusting parameter calculating module is used for calculating adjusting parameters of each rapid adjusting inverter
Figure BDA0003480580950000041
ptAdjusting target power in the active control instruction; the balance module is used for adjusting the common inverter to achieve adjustment balance according to adjustment parameters of the rapid adjustment inverter, the power reference values of the rapid adjustment inverter and the common inverter are the same, and in the adjustment process, the power reference values are the same along with p2Variation of regulation of p1Gradually make pi1＝pi2Reaching a steady state;
the process of adjusting the balance comprises:
s1: calculating the maximum power p that can be output by the fast-regulating inverter in a regulation period2maxAnd minimum power p2minAnd judging the total regulation power of all the fast regulating invertersWhether the ratio is greater than the maximum power p that can be output2max；
S2: when the total regulated power is greater than the maximum power p that can be output2maxThen all the fast regulating inverters are put into operation;
s3: when the total regulated power is less than the maximum power p that can be output2maxAnd is greater than the minimum power p2minIncreasing the number of the rapid adjustment inverters one by one until a steady state is reached;
s4: when the total regulated power is less than the minimum power p2minAnd when the power is required to be adjusted, all the fast adjusting inverters are cut off, and the power of each common inverter is adjusted according to the maximum power and the minimum power of the reference inverter.
Furthermore, the remote management module comprises a regulation and control module, an alarm information management module and an operation and maintenance management module; the regulation and control module is used for inputting an active regulation and control instruction, an electrical regulation parameter and an alarm mode by a user; the alarm information management module comprises a processed alarm module and a to-be-processed alarm module, the processed alarm module is used for recording the processed alarm information of the same day, and the to-be-processed alarm module is used for marking the state of the unprocessed alarm information of the same day as to-be-processed and reminding the unprocessed alarm information of the same day at regular time; and the operation and maintenance management module is used for managing the operation and maintenance period and the operation and maintenance personnel information.
According to the technical scheme, the invention has the beneficial effects that: the invention can flexibly control the speed of the inverter by adopting the inverter classification regulation method, and can ensure that the photovoltaic power station has quick and accurate regulation capability and improve the regulation capacity of the photovoltaic power station by utilizing the power balance method.
In addition to the above objects, features and advantages, preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings so that the features and advantages of the present invention can be easily understood.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly described, wherein the drawings are only used for illustrating some embodiments of the present invention and do not limit all embodiments of the present invention thereto.
Fig. 1 is a schematic structural diagram of a power conditioning system of a hybrid energy storage photovoltaic power station according to the present invention.
Fig. 2 is a schematic diagram of a composition structure of the calculation analysis module according to the present invention.
Fig. 3 is a schematic structural diagram of the monitoring module according to the present invention.
Fig. 4 is a schematic diagram of a power conditioning module according to the present invention.
FIG. 5 is a schematic diagram of the specific steps of the process of adjusting the balance according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention. Like reference symbols in the various drawings indicate like elements. It should be noted that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
The hybrid energy storage photovoltaic grid-connected power generation system adopts an AC/DC bus structure, a photovoltaic array adopts a disturbance monitoring method to carry out MPPT control, and an inverter adopts a three-phase voltage source type grid-connected inverter structure. However, the MPPT power regulation rate of the traditional photovoltaic power station is slow, and the requirements of power grid frequency modulation and voltage regulation cannot be met. How to carry out applicability power balance and control on a new photovoltaic grid-connected power generation system under the conditions of scheduling instruction change, illumination intensity change and load change is an important research direction for realizing scheduling type safe power generation. Therefore, the invention provides a power regulating system of a hybrid energy storage photovoltaic power station. As shown in fig. 1 to 5, the system includes: the power generation system comprises a monitoring module, a calculation and analysis module, a power regulation module and a remote management module, wherein the monitoring module is used for monitoring electrical state parameters and safety information of a power station in the power generation process.
Specifically, the monitoring module comprises a data detection module, a dividing module and an information transmission module; the data detection module comprises a current transformer for detecting current information of a grid-connected point and a voltage transformer for detecting voltage information of the grid-connected point; the dividing module is used for dividing a plurality of inverters in the station into a common inverter and a quick adjusting inverter according to the uplink dividing parameter information, and numbering and describing the common inverter and the quick adjusting inverter; the data detection module and the dividing module are electrically connected with the information transmission module, and the information transmission module is used for sending detection data to the calculation analysis module and receiving dividing parameter information.
In this embodiment, because the difference in the adjustment speed of each inverter in the photovoltaic power plant affects power adjustment, and the adjustment speed of the conventional power adjustment algorithm may be affected by a common (slow) inverter, which results in an excessively long adjustment time, and the like, the inverters are divided into two types, i.e., a common inverter and a fast adjustment inverter, and the fast adjustment inverter is adjusted to meet an adjustment instruction in the adjustment process, and then the common inverter is adaptively adjusted until a steady state is reached.
In the power control and regulation process of the photovoltaic power station, the temperature control of the power station and the power and voltage of a peripheral power grid needs to be ensured, and the safety of power station equipment and personnel also needs to be ensured, so that the monitoring module also designs a temperature detection module and a video monitoring module for detecting the temperature change information of the inverter; the temperature detection module comprises a plurality of temperature detectors and a controller, each temperature detector transmits detected temperature information to the controller according to a certain frequency, the controller calculates an average value of the temperature information in a preset period, compares the average value with a safety temperature threshold value, and sends alarm information to the remote management module through the calculation and analysis module if the average value exceeds the safety temperature threshold value; the video monitoring module is used for carrying out safety monitoring on the surrounding environment of the photovoltaic power station, the video monitoring module comprises a video acquisition device and an abnormal behavior identification module, the video acquisition device carries out image preprocessing on acquired environment image information and then sends the processed environment image information to the abnormal behavior identification module, the abnormal behavior identification module carries out feature extraction on the image by utilizing a person abnormal behavior identification algorithm based on deep learning, extracted information is compared with person abnormal feature information stored in an abnormal information database, and whether abnormal behaviors occur or not is judged according to a comparison result. Temperature detection can predict in advance whether power generation equipment is in an abnormal working state or not so as to carry out early warning and operation and maintenance inspection in advance and guarantee the safety of the power regulation process, and video monitoring can carry out real-time inspection on the surrounding environment of a photovoltaic power station to prevent personnel safety accidents.
In the system, the calculation analysis module is electrically connected with the remote management module and is used for receiving adjustment instruction information, judging whether the electrical state parameters are abnormal or not and sending an adjustment signal to the power adjustment module.
The calculation analysis module comprises a power prediction module, a power calculation module and an abnormality judgment module; the power prediction module is used for predicting the maximum active power p of the ith inverter of the photovoltaic power stationmaxAnd minimum starting power pminThe ith inverter is a reference inverter which always operates in a maximum power tracking mode and outputs active power outwards but does not participate in active regulation, and the active output of the photovoltaic power station is po＝p1+p2+pmax(ii) a The power calculation module comprises a real-time calculation module and a period calculation module, the real-time calculation module is used for calculating the real-time power of the grid-connected inverter according to the collected current information and voltage information of the grid-connected point, the period calculation module is used for calculating the total power value of the common inverter and the rapid-adjustment inverter in an adjustment period, and the total power value
Figure BDA0003480580950000081
Wherein p isiuRepresenting the output power of a regulation cycle, N, in the ith inverter of the u-th classuThe value of u is 1 or 2 for the number of the u-type inverters, and the power calculation module sends real-time power information and periodic power information to the power regulation module to be used as a regulation feedback value for power closed-loop regulation; and the abnormity judgment module is used for judging whether the actual active power value of the photovoltaic power station exceeds the set active power regulation and control range or not and giving a safety alarm to the abnormal condition.
Specifically, the abnormality judgment module comprises a comparison module and a safety alarm module; the comparison module compares the actual active power value of the photovoltaic power station with a set active power control threshold of the photovoltaic power station, and if the actual active power value of the photovoltaic power station exceeds the active power control threshold range of the photovoltaic power station, alarm information is sent to the safety alarm module; the safety alarm module generates a multi-mode alarm control signal according to alarm information, the alarm device carries out on-site acousto-optic alarm and remote alarm according to the alarm control signals in different modes, the actual active power value of the photovoltaic power station is repeatedly detected and calculated within a period of time, whether the actual active power value exceeds a set active power regulation range is judged, if the actual active power value does not exceed the set active power regulation range, the alarm is relieved, otherwise, the safety alarm module sends a control instruction to the removal control device, the removal control device removes a photovoltaic power generation feeder line, and the electrical state information, the alarm information, the station number and the location information of the current photovoltaic power station are uploaded to the remote management module. When an abnormal condition occurs, the photovoltaic power generation part needs to be cut off emergently for troubleshooting, and the photovoltaic power generation part is connected again after safety.
The power adjusting module is used for adjusting the power generation power and the starting time and distributing the power of each inverter, and specifically comprises an instruction receiving module and an adjusting balance module, wherein the instruction receiving module is used for receiving an uplink active control instruction; the adjusting and balancing module is electrically connected with the instruction receiving module, and controls the rapid adjusting inverter to enable the output power of the photovoltaic power station to meet an active instruction in a short time, controls the common inverter to be in an operating state, and performs power balance on the inverters with different adjusting speeds.
The adjusting and balancing module comprises an adjusting parameter calculating module and a balancing module; the adjusting parameter calculating module is used for calculating adjusting parameters of each rapid adjusting inverter
Figure BDA0003480580950000091
Figure BDA0003480580950000092
ptAdjusting target power in the active control instruction; the balance module is used for adjusting the common inverter to achieve adjustment balance according to adjustment parameters of the rapid adjustment inverter, the power reference values of the rapid adjustment inverter and the common inverter are the same, and in the adjustment process, the power reference values are the same along with p2Variation of regulation of p1Gradually make pi1＝pi2Reaching a steady state;
as shown in fig. 5, the process of adjusting the balance is as follows:
s1: calculating the maximum power p that can be output by the fast-regulating inverter in a regulation period2maxAnd minimum power p2minAnd judging whether the total regulated power of all the fast regulating inverters is greater than the maximum power p which can be output2max；
S2: when the total regulated power is greater than the maximum power p that can be output2maxThen all the fast regulating inverters are put into operation;
s3: when the total regulated power is less than the maximum power p that can be output2maxAnd is greater than the minimum power p2minIncreasing the number of the rapid adjustment inverters one by one until a steady state is reached;
s4: when the total regulated power is less than the minimum power p2minAnd when the power is required to be adjusted, all the fast adjusting inverters are cut off, and the power of each common inverter is adjusted according to the maximum power and the minimum power of the reference inverter.
In the system, the remote management module is used for modifying and managing the power regulation process and the regulation parameters, and alarming and operation and maintenance management are carried out under the condition of abnormal faults. The remote management module comprises a regulation and control module, an alarm information management module and an operation and maintenance management module; the regulation and control module is used for inputting an active regulation and control instruction, an electrical regulation parameter and an alarm mode by a user; the alarm information management module comprises a processed alarm module and a to-be-processed alarm module, the processed alarm module is used for recording the processed alarm information of the same day, and the to-be-processed alarm module is used for marking the state of the unprocessed alarm information of the same day as to-be-processed and reminding the unprocessed alarm information of the same day at regular time; and the operation and maintenance management module is used for managing the operation and maintenance period and the operation and maintenance personnel information.
According to the method and the device, the inverters are classified and adjusted, so that the accuracy and the rapidity of power adjustment are improved, and the active power adjustment capacity of the photovoltaic power station is improved.
It should be noted that the described embodiments of the invention are only preferred ways of implementing the invention, and that all obvious modifications, which are within the scope of the invention, are all included in the present general inventive concept.

Claims (8)

1. A power conditioning system for a hybrid energy storage photovoltaic power plant, comprising: the device comprises a monitoring module, a calculation and analysis module, a power regulation module and a remote management module;
the monitoring module is used for monitoring electrical state parameters and safety information of the power station in the power generation process;
the calculation analysis module is electrically connected with the remote management module and is used for receiving adjustment instruction information, judging whether the electrical state parameters are abnormal or not and sending an adjustment signal to the power adjustment module;
the power adjusting module is used for adjusting the power generation power and the starting time and distributing the power of each inverter;
and the remote management module is used for modifying and managing the power regulation process and the regulation parameters and alarming and managing operation and maintenance under the abnormal condition of the fault.
2. The power management system of a hybrid energy storage photovoltaic power plant of claim 1, wherein the monitoring module comprises a data detection module, a partitioning module, and an information transmission module;
the data detection module comprises a current transformer for detecting current information of a grid-connected point and a voltage transformer for detecting voltage information of the grid-connected point;
the dividing module is used for dividing a plurality of inverters in the station into a common inverter and a quick adjusting inverter according to the uplink dividing parameter information, and numbering and describing the common inverter and the quick adjusting inverter;
the data detection module and the dividing module are electrically connected with the information transmission module, and the information transmission module is used for sending detection data to the calculation analysis module and receiving dividing parameter information.
3. The power management system of a hybrid energy storage photovoltaic power plant of claim 2 wherein the monitoring module further comprises a temperature detection module and a video monitoring module for detecting inverter temperature variation information;
the temperature detection module comprises a plurality of temperature detectors and a controller, each temperature detector transmits detected temperature information to the controller according to a certain frequency, the controller calculates an average value of the temperature information in a preset period, compares the average value with a safety temperature threshold value, and sends alarm information to the remote management module through the calculation and analysis module if the average value exceeds the safety temperature threshold value;
the video monitoring module is used for carrying out safety monitoring on the surrounding environment of the photovoltaic power station, the video monitoring module comprises a video acquisition device and an abnormal behavior identification module, the video acquisition device carries out image preprocessing on acquired environment image information and then sends the processed environment image information to the abnormal behavior identification module, the abnormal behavior identification module carries out feature extraction on the image by utilizing a person abnormal behavior identification algorithm based on deep learning, extracted information is compared with person abnormal feature information stored in an abnormal information database, and whether abnormal behaviors occur or not is judged according to a comparison result.
4. The power conditioning system for a hybrid energy storage photovoltaic power plant of claim 1 wherein the calculation and analysis module comprises a power prediction module, a power calculation module, and an anomaly determination module;
the power prediction module is used for predicting the maximum active power p of the ith inverter of the photovoltaic power stationmaxAnd minimum starting power pminThe ith inverter is a reference inverter which always operates in a maximum power tracking mode and outputs active power outwards but does not participate in active regulation, and the active output of the photovoltaic power station is po＝p1+p2+pmax；
The power calculation module comprises a real-time calculation module and a period calculation module, the real-time calculation module is used for calculating the real-time power of the grid-connected inverter according to the collected current information and voltage information of the grid-connected point, the period calculation module is used for calculating the total power value of the common inverter and the rapid-adjustment inverter in an adjustment period, and the total power value
Figure FDA0003480580940000021
Wherein p isiuRepresenting the output power of a regulation cycle, N, in the ith inverter of the u-th classuThe value of u is 1 or 2 for the number of the u-type inverters, and the power calculation module sends real-time power information and periodic power information to the power regulation module to be used as a regulation feedback value for power closed-loop regulation;
and the abnormity judgment module is used for judging whether the actual active power value of the photovoltaic power station exceeds the set active power regulation and control range or not and giving a safety alarm to the abnormal condition.
5. The power conditioning system for a hybrid energy storage photovoltaic plant of claim 4 wherein the anomaly determination module comprises a comparison module and a safety alarm module;
the comparison module compares the actual active power value of the photovoltaic power station with a set active power control threshold of the photovoltaic power station, and if the actual active power value of the photovoltaic power station exceeds the active power control threshold range of the photovoltaic power station, alarm information is sent to the safety alarm module;
the safety alarm module generates a multi-mode alarm control signal according to alarm information, the alarm device carries out on-site acousto-optic alarm and remote alarm according to the alarm control signals in different modes, the actual active power value of the photovoltaic power station is repeatedly detected and calculated within a period of time, whether the actual active power value exceeds a set active power regulation range is judged, if the actual active power value does not exceed the set active power regulation range, the alarm is relieved, otherwise, the safety alarm module sends a control instruction to the removal control device, the removal control device removes a photovoltaic power generation feeder line, and the electrical state information, the alarm information, the station number and the location information of the current photovoltaic power station are uploaded to the remote management module.
6. The power conditioning system for a hybrid energy storage photovoltaic plant of claim 1 wherein the power conditioning module comprises a command receiving module and a conditioning balancing module, the command receiving module configured to receive an upstream active control command; the adjusting and balancing module is electrically connected with the instruction receiving module, and controls the rapid adjusting inverter to enable the output power of the photovoltaic power station to meet an active instruction in a short time, controls the common inverter to be in an operating state, and performs power balance on the inverters with different adjusting speeds.
7. The power management system of a hybrid energy storage photovoltaic power plant of claim 6, wherein the regulation balance module comprises a regulation parameter calculation module and a balance module; the adjusting parameter calculating module is used for calculating adjusting parameters of each rapid adjusting inverter
Figure FDA0003480580940000031
ptAdjusting target power in the active control instruction; the balance module is used for adjusting the common inverter to achieve adjustment balance according to adjustment parameters of the rapid adjustment inverter, the power reference values of the rapid adjustment inverter and the common inverter are the same, and in the adjustment process, the power reference values are the same along with p2Variation of regulation of p1Gradually make pi1＝pi2Reaching a steady state;
the process of adjusting the balance comprises:
s1, calculating the maximum power p which can be output by the quick-adjustment inverter in a regulation period2maxAnd minimum power p2minAnd judging whether the total regulated power of all the fast regulating inverters is greater than the maximum power p which can be output2max；
S2, when the total regulated power is larger than the maximum power p that can be output2maxThen all the fast regulating inverters are put into operation;
s3, when the total regulated power is less than the maximum power p that can be output2maxAnd is greater than the minimum power p2minIncreasing the number of the rapid adjustment inverters one by one until a steady state is reached;
s4, when the total regulated power is less than the minimum power p2minAnd when the power is required to be adjusted, all the fast adjusting inverters are cut off, and the power of each common inverter is adjusted according to the maximum power and the minimum power of the reference inverter.
8. The power conditioning system for a hybrid energy storage photovoltaic power plant of claim 1 wherein the remote management module comprises a regulation module, an alarm information management module, and an operation and maintenance management module; the regulation and control module is used for inputting an active regulation and control instruction, an electrical regulation parameter and an alarm mode by a user; the alarm information management module comprises a processed alarm module and a to-be-processed alarm module, the processed alarm module is used for recording the processed alarm information of the same day, and the to-be-processed alarm module is used for marking the state of the unprocessed alarm information of the same day as to-be-processed and reminding the unprocessed alarm information of the same day at regular time; and the operation and maintenance management module is used for managing the operation and maintenance period and the operation and maintenance personnel information.
CN202210067080.7A 2022-01-20 2022-01-20 Power regulating system of hybrid energy storage photovoltaic power station Withdrawn CN114421621A (en)

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CN116169791A (en) * 2023-03-12 2023-05-26 华北电力大学 Power grid operation safety detection system containing pumped storage power station
CN116380176A (en) * 2023-05-29 2023-07-04 深圳市百事泰电气有限公司 Load early warning system of inverter based on digital signal processing
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CN116054276A (en) * 2022-12-30 2023-05-02 广东电网有限责任公司广州供电局 Photovoltaic power supply power regulation system based on power distribution network and implementation method thereof
CN116054276B (en) * 2022-12-30 2023-08-11 广东电网有限责任公司广州供电局 Photovoltaic power supply power regulation system based on power distribution network and implementation method thereof
CN116169791A (en) * 2023-03-12 2023-05-26 华北电力大学 Power grid operation safety detection system containing pumped storage power station
CN116169791B (en) * 2023-03-12 2024-02-06 华北电力大学 Power grid operation safety detection system containing pumped storage power station
CN116380176A (en) * 2023-05-29 2023-07-04 深圳市百事泰电气有限公司 Load early warning system of inverter based on digital signal processing
CN116380176B (en) * 2023-05-29 2023-08-29 深圳市百事泰电气有限公司 Load early warning system of inverter based on digital signal processing
CN116469058A (en) * 2023-06-19 2023-07-21 安徽省国家电投和新电力技术研究有限公司 Method and system for monitoring fire hazard of photovoltaic power station based on computer vision
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CN117728588A (en) * 2024-02-07 2024-03-19 华能江苏综合能源服务有限公司 Inverter state monitoring method and system
CN117728588B (en) * 2024-02-07 2024-05-10 华能江苏综合能源服务有限公司 Inverter state monitoring method and system

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