CN111446739A - Power distribution station distribution system with distributed energy storage devices and control method thereof - Google Patents
Power distribution station distribution system with distributed energy storage devices and control method thereof Download PDFInfo
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- CN111446739A CN111446739A CN202010226631.0A CN202010226631A CN111446739A CN 111446739 A CN111446739 A CN 111446739A CN 202010226631 A CN202010226631 A CN 202010226631A CN 111446739 A CN111446739 A CN 111446739A
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—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
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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
- Y04S10/14—Energy storage units
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a distribution station power distribution system with distributed energy storage devices and a control method thereof, wherein a transformer in the distribution system is connected with the distributed energy storage devices through a low-voltage distribution switch, the energy storage system comprises an energy storage converter PCS, a battery system, a battery management system BMS, an intelligent controller and a communication module, the energy storage converter PCS is connected with a battery pack at the direct current side, the alternating current side is connected with a low-voltage bus of the station, and meanwhile, the energy storage system is communicated with a TTU of the distribution station where the energy storage converter is located, and all the energy storage devices are integrated in a JP cabinet to realize better management and configuration. According to the distribution system of the distribution area, the distributed energy storage devices are arranged in the distribution system, so that power failure under the conditions of periodical and sudden heavy loads and the like is prevented, overload of lines and transformers is prevented, primary equipment investment of a distribution network is reduced, and equipment utilization rate is improved.
Description
Technical Field
The invention belongs to application of an electric energy storage device in a power distribution system, and particularly relates to a power distribution station distribution system with a distributed energy storage device.
Background
With the increase of the electricity load along with the improvement of the living standard of people in economic development, the normal operation of some distribution areas in many areas is caused, but the peak load appears for a plurality of times in one year and can approach or even exceed the capacity of the existing transformer and line, so that the tripping and power failure are caused, and the power supply reliability is reduced. The method brings great difficulty to power supply service and operation management of a power grid company, and is mainly solved by adopting a mode of capacity increase and extension of a power distribution area at present. But the disadvantages of long construction period and low equipment utilization rate are obvious.
On the other hand, peak power occurs in most distribution substations during peak load periods, such as summer and spring festival, and the situation that the capacity of the transformer and the line is approached or even exceeded occurs frequently. This situation is prone to trip power outage. In addition, if a certain place takes a major activity or a major event occurs, the field power consumption load is greatly increased, and the phenomena of overload and even tripping of a line and a transformer often occur. Therefore, the customer satisfaction is improved, the primary equipment investment of the power distribution network is reduced, and the improvement of the utilization rate of the power distribution network equipment is increasingly emphasized by power customers and power grid companies. It is therefore of great interest to research and develop distributed energy storage devices for distribution substations, which can be used to handle such seasonal, intermittent, high peak loads.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems that the existing transformer and line construction of some distribution substations have small margin and cannot meet the power supply requirement and energy conservation, the invention provides a distribution substation distribution system with distributed energy storage devices. Based on the system, the second purpose of the invention is to provide a control method of a distribution substation power distribution system with distributed energy storage devices.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a transformer in the power distribution system is connected with a distributed energy storage system device through a low-voltage power distribution switch, the energy storage system comprises an energy storage converter, a battery pack, a battery management system, an intelligent controller and a communication module, the battery pack is connected to the direct current side of the energy storage converter, the alternating current side of the energy storage converter is connected with a low-voltage bus of the distribution area, and meanwhile, the energy storage system is communicated with a TTU of the distribution area.
Secondly, the battery pack takes a lithium iron phosphate battery as an electric energy storage medium, and the single batteries are integrated in series and parallel to form a battery pack;
the battery management system monitors and calculates the state information of the battery in real time, wherein the state information comprises SOC, SOH, voltage, current and temperature parameters so as to realize active balance control, thermal management control and alarm of the battery pack;
the energy storage converter converts the alternating current of the power grid and the direct current of the battery into each other;
the intelligent controller determines an operation strategy and controls a PCS operation mode according to the TTU transmission information and the state information of the BMS;
the communication module is used for signal transmission and data acquisition of a transmission system monitoring network.
Furthermore, the system is connected to a distribution automation main station system through an intelligent distribution transformer terminal, and the distribution automation main station system collects data information of a low-voltage distribution switch, a temperature sensor, a concentrator, a three-phase imbalance adjusting device, a branch monitoring unit, a distributed energy storage device and a user side, so that monitoring and distribution regulation are realized.
And further, the capacity of the energy storage battery module is configured according to the capacity of the transformer area and is output by the single distributed energy storage devices in parallel.
And the converter of the power distribution system is a three-phase four-wire system topological framework, the current of the system is monitored in real time through an external current transformer, whether the system is in an unbalanced state is judged, the unbalanced current is transferred from a phase with large current to a phase with small current, and the unbalanced management is realized.
Furthermore, the energy storage battery management system comprises a BMU (battery unit detection), a BCMU (battery pack monitoring unit) and a BAMS (battery system control system):
the battery unit detects the running state information of the BMU in real time, wherein the running state information comprises the temperature, the voltage and the current, the SOC and the SOH of the single battery;
the battery pack monitoring BCMU realizes the detection and control of the battery pack, including the detection of voltage balance indexes and the running state of each battery pack, and performs balance control on the voltage of the battery pack;
the battery system control BAMS displays the state information of the battery management system, detects and controls a battery pack formed by single batteries, and comprises threshold setting and alarming of power grid operation monitoring parameters and fault information display.
A control method of a distribution station distribution system with distributed energy storage devices is characterized in that a harmonic online monitoring unit is integrated in the distributed energy storage devices in the system, an independent data acquisition unit is not needed, when the fact that the harmonic current of the system exceeds a certain given value is detected, harmonic current is filtered in an active mode in the residual capacity range of the device, the primary side of an energy storage converter is equivalent to an active power filter, and the energy storage converter is controlled to generate harmonic quantity opposite to the harmonic current, so that the power grid current is sinusoidal.
Further, the power distribution system is charged by the PCS in the valley of power consumption under the scheduling of edge computing equipment of the intelligent power distribution terminal TTU, and converts the alternating current of a power grid into direct current of a battery to store electric energy; and when the electricity consumption peak is reached, the PCS is charged, the direct current of the battery is converted into alternating current of a power grid, the electric energy is released, and the load level control and the load transfer of the power system are realized.
Has the advantages that: compared with the prior art, the distribution system with the distributed energy storage devices integrates the functions of active power regulation, reactive power regulation and unbalance treatment, harmonic treatment, peak regulation, off-grid operation and plug-and-play and intelligent communication matching for the transformer area, and realizes the functions of increasing the power supply capacity of the transformer area and lines, peak clipping and valley filling of a power grid, treatment of the electric energy quality of the transformer area and autonomy of the intelligent transformer area. The method comprises the following remarkable effects:
(1) the device comprises energy storage converter PCS, energy storage battery, battery management system BMS, intelligent control ware and communication module, and energy storage converter direct current side connects the group battery, and the alternating current side links to each other with platform district low pressure generating line, keeps communicating with platform district TTU simultaneously, and all energy storage device are integrated in a standard JP cabinet. A plurality of similar devices can be operated in parallel to enlarge the system capacity, and the system is convenient and flexible; meanwhile, the device can form an energy management unit with other devices (such as electric automobile charging piles and other devices) in the distribution area, and the power flow flexible control of the power distribution network is realized. The whole device has strong compatibility and flexibility.
(2) The distributed energy storage device in the system supports various charging and discharging modes such as constant current, constant voltage or constant power, can complete the process from full power charging to full power discharging or from full power discharging to full power charging within 60ms, and can effectively stabilize the impulsive load or the power fluctuation of the distributed power supply in a platform area. The intelligent distribution terminal (TTU) intelligent scheduling control Point of Common Coupling (PCC) power can be accepted, the local consumption level of the distributed power supply is improved, the transformer load rate of a transformer in a transformer area is reduced in the peak period of power utilization, and the overload tripping outage fault is avoided.
(3) The converter adopts a three-phase four-wire system topological framework, the current of the system is monitored in real time through an external Current Transformer (CT), whether the system is in an unbalanced state or not is judged, the unbalanced current is transferred from a phase with large current to a phase with small current, and unbalanced management is realized. And sampling the voltage of the compensation point, judging whether the voltage of the compensation point exceeds a set value, and regulating and outputting inductive current or capacitive current to stabilize the voltage of each phase within a normal range.
(4) The distributed energy storage device provided by the invention integrates a harmonic online monitoring function, an independent data acquisition unit is not required to be arranged, when the monitored harmonic current magnitude exceeds a set value, the energy storage converter is not in charge and discharge operation, but is changed into an APF operation mode, and the current change is tracked in real time through the control of a topological circuit to generate harmonic waves with phases opposite to the system harmonic current and inject the harmonic waves into a power grid, so that the power grid current is filtered or the harmonic waves are reduced.
(5) The distributed energy storage device provided by the invention can charge and store electric energy by the PCS in the power consumption valley and discharge and release the electric energy by the PCS in the power consumption peak under the scheduling of edge computing equipment of the intelligent power distribution terminal TTU, so that the peak-valley difference of a power grid is weakened, the load characteristic of the power grid is improved, and the load level control and the load transfer of a power system are realized.
(6) The distributed energy storage device for the distribution area can be constructed into an energy management unit together with a distributed power supply, an electric automobile, a load or a cold and heat storage device in the distribution area. The distributed energy storage device used for the power distribution area is used as an energy storage element support area intelligent distribution transformer terminal to execute various control strategies such as economic operation, peak clipping and valley filling, emergency power support and the like, and flexibly regulates and controls the distribution of electric loads by orderly guiding distributed energy storage charging and discharging strategies, so that the tide flexible control of the power distribution network is realized, and the purposes of peak clipping and valley filling and improvement of the utilization rate of power grid equipment are achieved.
(7) When the device is connected to an on-site monitoring network, the device can be automatically identified as a newly-inserted device by a smart power distribution terminal (TTU) and managed without changing an application program of a scheduling system. Therefore, the complexity of system coding is reduced, the system is easier to maintain, the flexibility of the system is improved, the system tends to be intelligent, and the method has important significance in the aspect of measuring and controlling system application. The device supports various communication protocols such as MODBUS, 104, 61850/GOOSE, 61850/MMS, is automatically associated and matched with a power distribution internet of things terminal based on edge calculation, receives scheduling control of an intelligent power distribution terminal (TTU) device, realizes optimized combination of control modes according to the current situation of the power quality of a transformer area, sets active, reactive and unbalanced capacity proportion, and comprehensively treats power consumption of the transformer area.
Drawings
FIG. 1 is a schematic diagram of a distribution bay system of the power distribution system of the present invention;
FIG. 2 is a schematic diagram of a distributed energy storage apparatus according to the present invention;
fig. 3 is a schematic diagram of a battery management system of the distributed energy storage apparatus according to the present invention.
Detailed Description
To explain the technical solutions disclosed in the present invention in detail, the following description is further made with reference to the accompanying drawings and specific examples.
With the improvement of the living standard of people in economic development and the increase of the power load, the normal operation of some distribution areas in many areas of China is caused at ordinary times, but the peak load appears for a plurality of times in one year and can approach or even exceed the capacity of the existing transformer and line, so that the tripping and power failure are caused, and the power supply reliability is reduced. The method brings great difficulty to power supply service and operation management of a power grid company, and is mainly solved by adopting a method of capacity increase and extension of a power distribution area at present. But the disadvantages of long construction period and low equipment utilization rate are obvious.
The invention provides a power distribution area power distribution system with distributed energy storage devices to solve the technical problems. The device is to the platform district, collect active regulatory function, reactive power regulation and unbalance management function, harmonic management function, peak regulation function, off-grid operation function, plug-and-play and intelligent communication matching function in an organic whole, realize increasing platform district and circuit power supply capacity, the electric wire netting peak clipping is filled the millet, platform district electric energy quality is administered, intelligent platform district is autonomic, with the intelligent control device of other equipment (such as electric automobile charging pile etc.) plug-and-play coordinated control in the platform district. A distributed energy storage device for joining in marriage electric platform district comprises energy storage battery module, battery management system, converter, intelligent control ware, wisdom communication module, adopts compact miniaturized design, can the direct mount in the platform district. The system framework is shown in fig. 1-3.
The energy storage battery module adopts a lithium battery to form the battery module, and the capacity configuration is considered by the capacity of a transformer in a common distribution station area. The transformer in the distribution station area has the models of 100kVA, 200kVA, 400kVA and the like, so that the battery capacity of 100kWh is selected for a single device, and the power of the single device is configured to be 50kW or 100 kW. The device has the characteristics of detachability, parallel use of each single device and the like. The size of the whole device is made into the size of a platform area standard cabinet, and the whole device is directly arranged in the middle of a telegraph pole of a power distribution platform area and does not occupy the space additionally.
The battery management system is mainly used for managing and monitoring the battery. The system mainly comprises a human-computer interface, a master control unit (BAU), a main control unit (BCU), a slave control unit (BMU) and corresponding wiring harnesses. The device has the characteristics of wide functional coverage, small volume, strong anti-interference performance, safety, reliability and the like.
The converter is a three-phase converter, a three-phase four-wire system topological framework is adopted, the rated power of a single converter is 50kW or 100kW, the voltage range of a direct current side is 600V-850V, the voltage of an alternating current side is 380V, and the maximum output power is 55 kW. The converter can realize the parallel operation function of the multiple converters.
The intelligent controller can be automatically associated and matched with an intelligent distribution Transformer Terminal (TTU) and an edge computing device, receives scheduling control of the intelligent distribution Transformer Terminal (TTU), realizes optimized combination of control modes according to the current situation of the power quality of a transformer area, sets active, reactive and unbalanced capacity ratios, and comprehensively governs the power consumption of the transformer area.
The intelligent communication module supports various communication protocols such as MODBUS, 104, 61850/GOOSE, 61850/MMS and the like, and is automatically associated and matched with the power distribution internet of things terminal based on edge computing.
The active regulation function is as follows: the rated capacity of the transformer and line may be exceeded during peak loads in the distribution substation area. The distributed energy storage device can perform power compensation on the distributed energy storage device, and power failure and power limitation caused by overload are prevented. The power distribution system supports various charging and discharging modes such as constant current, constant voltage or constant power, can effectively stabilize impact load or distributed power supply power fluctuation in a transformer area, reduces the transformer load rate of the transformer area in the peak period of power utilization, and avoids overload tripping and power failure.
Reactive power regulation and unbalance treatment functions: the energy storage device can be used for reactive compensation, adjusting bus voltage, sampling compensation point voltage, judging whether the compensation point voltage exceeds a set value, and adjusting and outputting inductive current or capacitive current to enable each phase voltage to be stabilized within a normal range. This device can judge whether the platform district is in unbalanced state, shifts unbalanced current from the big phase transfer of electric current to the little phase of electric current, realizes the unbalanced management in distribution platform district.
The harmonic treatment function: the device is internally integrated with a harmonic online monitoring function, an independent data acquisition unit is not required to be arranged, and harmonic current is filtered in an active mode within the residual capacity range of the device.
The peak regulation function is as follows: according to the requirements of a dispatching center of a power grid company, electric energy can be stored in the low-ebb electricity consumption period, and is released in the high-ebb electricity consumption period, so that the peak-valley difference of the power grid is weakened, the load characteristic of the power grid is improved, and the load level control and load transfer of a power system are realized.
Off-grid operation function: when the platform area is disconnected with an external power grid and is independently connected with a load, the device operates as a main power supply of an off-grid system, stable voltage and frequency support is provided for the load, uninterrupted operation of part of important loads can be guaranteed, and economic loss caused by power failure is reduced. In this mode, it is necessary to ensure that the power of the load should not exceed the capacity range of the device and battery.
Plug-and-play and intelligent communication match functions: the device has a plug-and-play function, and adopts a self-adaptive access distributed variable flow system control strategy in order to ensure that the distribution station area can adaptively respond to the change of the impedance of the power grid, has the robustness of power grid voltage adjustment, adapts to the fault operation states of power grid balance, unbalanced voltage drop, distortion and the like, and realizes the island detection of the multi-distributed variable flow system. The device is connected to the end of a relatively weak power distribution network, the power grid is complex in running state, the power grid impedance is variable, and the device brings about not little challenge to the stability of a power distribution station area. Therefore, the plug-and-play function can realize the self-adaptive change of the power grid impedance, and the output impedance of the power grid can be self-adaptively reconstructed according to the change of the power grid impedance. The output impedance of the converter system of the device is coupled together through the controller, and can be effectively adjusted and reconstructed through a flexible control strategy. The function is good for improving the operation stability of the distribution station area of loads such as a distributed power supply and an electric automobile charging pile and improving the receiving capacity of the distribution station area to the distributed power supply.
When the device is plugged into a distribution substation area, a smart distribution terminal (TTU) can automatically recognize and manage a newly inserted device in a field monitoring network. The device supports various communication protocols such as MODBUS, 104, 61850/GOOSE, 61850/MMS, is automatically associated and matched with a power distribution internet of things terminal based on edge calculation, receives scheduling control of an intelligent power distribution terminal (TTU) device, and can realize coordination control with other devices in a power distribution station area, such as an electric automobile charging pile, distributed photovoltaic, controllable load and the like, according to the current situation of the power quality of the station area, so that all the devices in the power distribution station area can be safely, stably and reliably used.
Claims (8)
1. A power distribution substation power distribution system with distributed energy storage devices, characterized by: the transformer in the power distribution system is connected with a distributed energy storage system device through a low-voltage power distribution switch, the energy storage system comprises an energy storage converter, a battery pack, a battery management system, an intelligent controller and a communication module, the energy storage converter is connected with the battery pack at the direct current side, and the alternating current side is connected with a low-voltage bus of a distribution area and is communicated with a TTU of the distribution area.
2. The power distribution substation power distribution system with distributed energy storage devices of claim 1, wherein: the battery pack takes a lithium iron phosphate battery as an electric energy storage medium, and the single batteries are integrated in series and parallel to form a battery pack;
the battery management system monitors and calculates the state information of the battery in real time, wherein the state information comprises SOC, SOH, voltage, current and temperature parameters so as to realize active balance control, thermal management control and alarm of the battery pack;
the energy storage converter converts the alternating current of the power grid and the direct current of the battery into each other;
the intelligent controller determines an operation strategy and controls a PCS operation mode according to the TTU transmission information and the state information of the BMS;
the communication module is used for signal transmission and data acquisition of a transmission system monitoring network.
3. The power distribution substation power distribution system with distributed energy storage devices of claim 1, wherein: the system is connected to a distribution automation main station system through an intelligent distribution transformer terminal, and the distribution automation main station system collects data information of a low-voltage distribution switch, a temperature sensor, a concentrator, a three-phase imbalance adjusting device, a branch monitoring unit, a distributed energy storage device and a user side, so that monitoring and distribution regulation are realized.
4. The power distribution substation power distribution system with distributed energy storage devices of claim 1, wherein: and the capacity of the energy storage battery module is configured according to the cell capacity and is output in parallel by each single distributed energy storage device.
5. The power distribution substation power distribution system with distributed energy storage devices of claim 1, wherein: the converter of the power distribution system is a three-phase four-wire system topological framework, system current is monitored in real time through an external current transformer, whether the system is in an unbalanced state is judged, unbalanced current is transferred from a phase with large current to a phase with small current, unbalanced management is achieved, the method comprises the steps of sampling voltage of a compensation point, judging whether the voltage of the compensation point exceeds a set value, and adjusting and outputting inductive current or capacitive current to enable each phase voltage to be stabilized within a preset threshold range.
6. The power distribution substation power distribution system with distributed energy storage devices of claim 1, wherein: the energy storage battery management system comprises a battery unit detection BMU, a battery pack monitoring BCMU and a battery system control BAMS, and is characterized in that:
the battery unit detects the running state information of the BMU in real time, wherein the running state information comprises the temperature, the voltage and the current, the SOC and the SOH of the single battery;
the battery pack monitoring BCMU realizes the detection and control of the battery pack, including the detection of voltage balance indexes and the running state of each battery pack, and performs balance control on the voltage of the battery pack;
the battery system control BAMS displays the state information of the battery management system, detects and controls a battery pack formed by single batteries, and comprises threshold setting and alarming of power grid operation monitoring parameters and fault information display.
7. A control method for implementing a power distribution substation power distribution system with distributed energy storage according to any of claims 1-6, characterized by: a harmonic online monitoring unit is integrated in a distributed energy storage device in the system, an independent data acquisition unit is not needed, when the harmonic current of the system is detected to exceed a set value, harmonic current is filtered in an active mode within the range of the residual capacity of the device, the primary side of an energy storage converter is equivalent to an active power filter, and the energy storage converter is controlled to generate harmonic quantity opposite to the harmonic current, so that the current of a power grid is sinusoidal.
8. The method of controlling a power distribution substation power distribution system having distributed energy storage devices of claim 7, wherein: the power distribution system is charged by the PCS in the power utilization valley under the scheduling of edge computing equipment of the intelligent power distribution terminal TTU, converts the power grid alternating current into battery direct current and stores electric energy; and when the electricity consumption peak is reached, the PCS is charged, the direct current of the battery is converted into alternating current of a power grid, the electric energy is released, and the load level control and the load transfer of the power system are realized.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112713604A (en) * | 2020-12-22 | 2021-04-27 | 合肥阳光新能源科技有限公司 | Energy storage power adjusting method and device and energy storage system |
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| CN112713603A (en) * | 2020-12-16 | 2021-04-27 | 惠州电力勘察设计院有限公司 | Intelligent power supply equipment on low-voltage side of power grid area |
| CN112713604A (en) * | 2020-12-22 | 2021-04-27 | 合肥阳光新能源科技有限公司 | Energy storage power adjusting method and device and energy storage system |
| CN112713604B (en) * | 2020-12-22 | 2023-04-07 | 阳光新能源开发股份有限公司 | Energy storage power adjusting method and device and energy storage system |
| CN112994197A (en) * | 2021-03-04 | 2021-06-18 | 江西赣锋锂电科技有限公司 | Modular DC/DC battery energy storage system |
| CN112953599A (en) * | 2021-03-29 | 2021-06-11 | 广东电网有限责任公司电力科学研究院 | Energy storage access terminal with power broadband carrier function |
| CN114513009A (en) * | 2022-04-21 | 2022-05-17 | 石家庄科林物联网科技有限公司 | Flexible-straight control method, device and system based on low-voltage distribution area |
| CN115579923A (en) * | 2022-10-18 | 2023-01-06 | 国网上海能源互联网研究院有限公司 | Energy storage optimization operation method and device for multiple scenes and multiple targets |
| CN115579923B (en) * | 2022-10-18 | 2024-02-23 | 国网上海能源互联网研究院有限公司 | Energy storage optimization operation method and device for multiple scenes and multiple targets |
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