CN114928079A - Platform area load balance control method based on intelligent fusion terminal and shared energy storage system - Google Patents
Platform area load balance control method based on intelligent fusion terminal and shared energy storage system Download PDFInfo
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
- H02J13/00017—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using optical fiber
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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
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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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
- 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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention provides a platform area load balancing control method based on an intelligent fusion terminal and a shared energy storage system, which comprises the following steps: step S1: selecting a fusion terminal of a certain zone as a master control fusion terminal and establishing communication connection with fusion terminals of other zones according to a master multi-slave mode and in combination with the preset fusion terminal priority; step S2: judging whether the slave fusion terminals of each station area inquire the master control fusion terminal to normally communicate; step S3: judging whether a transformer area is in an emergency power supply mode; step S4: the master control fusion terminal acquires information of interconnected mutual aid transformer areas, and solves the transfer power required by each transformer area by taking the load rate of each transformer area as a target; step S5: judging whether the surplus power of the direct-current side bus meets an energy storage power constraint condition or not; step S6: and the master control convergence terminal issues power instructions to each area PCS converter device and forwards the power instructions to each area convergence terminal. The load rate balance of the distribution transformer of the shared energy storage system participating in the distribution transformer area is realized, the utilization rate of energy storage resources is improved, and the overload operation loss of the distribution transformer is reduced.
Description
Technical Field
The invention relates to the technical field of low-voltage transformer area energy storage control, in particular to a transformer area load balancing control method based on an intelligent fusion terminal and a shared energy storage system.
Background
With the rapid development of new energy power generation technology, a low-voltage distribution area is used as the tail end of a power distribution network, and a large amount of electric energy brought by the access of a distributed power supply needs to be consumed. In addition, as the load increases rapidly, the peak-to-valley difference is increased continuously, and the problems of overload, low voltage and the like in the transformer area are gradually obvious. By introducing an energy storage technology, the distributed power supply can be supported and efficiently consumed and the platform area load balance can be realized. However, the problems of low resource utilization rate, poor comprehensive benefit, incapability of regional control of a power distribution network main station and the like existing in the energy storage independently configured in each distribution area are gradually highlighted, and the optimal control of a shared energy storage system gradually becomes an important problem to be faced by the economic operation of a low-voltage power distribution area.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a platform area load balancing control method based on an intelligent fusion terminal and a shared energy storage system, and aims to solve the problems that the loss of the platform area is increased when the platform area is overloaded, independent energy storage cannot be carried out, the overload of the platform area cannot be controlled across the platform areas, and the technical problem that the electric energy of a distributed power supply is consumed.
The method mainly comprises the following steps: step S1: when the shared energy storage system based on the fusion terminals starts to operate, according to the number of the fusion terminals, a master multi-slave mode is combined with the preset fusion terminal priority, the fusion terminal of a certain platform area is selected as a master control fusion terminal, and communication connection is established between the fusion terminal of the certain platform area and the fusion terminals of other platform areas; step S2: judging whether the slave fusion terminals of each station area inquire the master control fusion terminal to normally communicate; step S3: judging whether a transformer area is in an emergency power supply mode or not; step S4: the master control fusion terminal acquires information of interconnected mutual aid transformer areas, and solves the transfer power required by each transformer area by taking the load rate of each transformer area as a target; step S5: judging whether the surplus power of the direct-current side bus meets the energy storage power constraint condition or not; step S6: and the master control fusion terminal issues power instructions to each area PCS converter device and forwards the power instructions to each area fusion terminal.
The main control fusion terminal calculates the power interconnection and mutual assistance power instruction of each fusion terminal in a unified way, and comprehensively considers the energy storage power constraint, thereby realizing the balance of the distribution transformer load rate of the shared energy storage system participating in the distribution transformer area, improving the utilization rate of energy storage resources and reducing the overload operation loss of the distribution transformer.
The invention specifically adopts the following technical scheme:
a platform load balance control method based on an intelligent fusion terminal and a shared energy storage system is characterized in that based on a platform model formed by a plurality of interconnected shared energy storage systems, each shared energy storage system is formed by a fusion terminal, a communication gateway, an energy storage communication intermediate computer, an energy storage PCS converter and an energy storage BMS device which are connected in sequence;
the method comprises the following steps:
step S1: when the shared energy storage system is started to operate, selecting a fusion terminal of a certain platform area as a master control fusion terminal according to the number of the fusion terminals, a master-slave mode and a preset fusion terminal priority, and establishing communication connection with fusion terminals of other platform areas;
step S2: judging whether the slave fusion terminals of each station area inquire the master control fusion terminal to normally communicate;
step S3: judging whether a transformer area is in an emergency power supply mode or not;
step S4: the master control fusion terminal acquires information of interconnected mutual aid transformer areas, and solves the transfer power required by each transformer area by taking the load rate of each transformer area as a target;
step S5: judging whether the surplus power of the direct-current side bus meets the energy storage power constraint condition or not;
step S6: and the master control fusion terminal issues power instructions to the energy storage PCS converter devices of each transformer area and forwards the power instructions to the fusion terminals of each transformer area.
Further, step S2 is specifically:
the slave convergence terminal communicates with the master convergence terminal respectively and inquires the working state bit of the master convergence terminal for multiple times; if the master control fusion terminal is still in the communication abnormal state after being inquired for many times, the master control fusion terminal is transferred to the fusion terminal with the next priority according to the preset fusion terminal priority, master-slave relation communication is reestablished, and the judgment of the step S2 is carried out again; if the master control fusion terminal can not be determined to belong to the master control fusion terminal by polling all the fusion terminal priority sequences, feeding back a shared energy storage abnormal working alarm signal and stopping the power interconnection mutual aid function;
the slave convergence terminal communicates with the master convergence terminal respectively and inquires the working state bit of the master convergence terminal for multiple times; and if the feedback of the master control convergence terminal is normal, acquiring the operation mode of the energy storage communication central computer of each station by the master control convergence terminal, and determining the number n of the station which can participate in power interconnection and mutual assistance.
Further, step S3 is specifically:
setting all the fusion terminals in a normal working mode, collecting the running data of an energy storage system connected with a central computer of energy storage communication for multiple times through a communication gateway at fixed time intervals by the fusion terminals belonging to the same distribution area, and calculating an average value of electric quantity; the main control fusion terminal acquires the average value data of the electric quantity of n district fusion terminals participating in power interconnection and mutual aid at a time according to a fixed time interval through a subscription mechanism;
if a certain area convergence terminal is in the emergency power supply mode, after the master control convergence terminal acquires the slave convergence terminal emergency power-conserving state word, the master control convergence terminal takes over the control right of the convergence terminal of the emergency power supply area, and the number n of the participating power interconnection mutual aid areas obtained in the step S2 is reduced by 1; collecting the running data of an energy storage PCS converter device connected with a central computer of energy storage communication in an emergency power station area for multiple times at fixed time intervals by a master control fusion terminal and calculating an average value; and the calculated average value of the load power of the emergency power supply station area is uniformly distributed to the rest n-1 station areas participating in power interconnection and mutual assistance.
Further, the acquiring, by the master control convergence terminal, the electric quantity average value data of the other convergence terminals includes: distribution capacity of each area: s i And load ratio of distribution transformer: RoL i Split-phase voltage, current, active power, reactive power and power factor, energy storage PCS capacity S pcs_i PCS operating mode, PCS operating power: p pcs_i And an energy storage system SOC: SOC (system on chip) i And the electric quantity of the energy storage system such as real-time power and the like and the working state position of the fusion terminal.
Further, step S4 is specifically:
step S41: based on load rate RoL of each region i Calculating the average load rate of the n regions participating in power interconnection as follows:
step S42: calculating mutual-aid power P of energy storage PCS participation of each station area T_i (ii) a Definition P T_i <0 represents the AC to DC feed-in of electrical energy, P T_i >0 represents that the direct current feeds out electric energy to the alternating current; definition of RoL lim The load factor is the upper limit value of the distribution transformer load factor; calculated as follows:
further, step S5 is specifically:
step S51: calculating the surplus power P of the direct current bus without taking the absorption of the energy storage battery into account according to the following formula bus0 ：
Wherein, P bus0 <0, indicating that surplus power exists in the direct current bus, the energy storage battery participates in surplus power absorption of the transformer area, and the energy storage battery is in a charging state; p is bus0 >0, indicating the gap power of the direct current bus, enabling the energy storage battery to participate in gap power supplement of the transformer area, and enabling the energy storage battery to be in a discharging state;
step S52: the master control fusion terminal obtains the charging and discharging power limit value of the energy storage battery in each area, wherein the charging power limit value is P charge_lim_i Discharge power limit P discharge_lim_i Respectively calculating the total power limit P of charge and discharge according to the following formula charge_lim And P discharge_lim ：
Step S53: according to the DC bus surplus power P which is obtained by calculation in the step S4 and does not take the energy storage battery absorption into account bus0 Positive-negative relation of (1), judging P bus0 Whether the charging and discharging power limit value of the energy storage battery is met or not;
if P bus0 <0, the energy storage battery participates in the absorption of the surplus power of the direct current bus, and the surplus power P of the direct current bus absorbed by the energy storage battery is taken into account bus The requirements are as follows:
-P charge_lim ≤P bus ≤0 (1.6)
if P bus0 >0, the energy storage battery participates in the supplement of the notch power of the direct current bus, and the surplus power P of the direct current bus absorbed by the energy storage battery is taken into consideration bus The requirements are as follows:
0≤P bus ≤P discharge_lim (1.7)
step S54: if the direct current bus power which does not satisfy the formulas (1.6) and (1.7) exists, the common energy storage battery can not absorb the direct current bus power, and the required transfer power of each distribution area is reduced according to the following formula:
further, step S6 is specifically:
all the converged terminals are provided with a power interconnection mutual aid function enabling bit FlagA and a heavy load threshold value RoL th A trigger bit flag b; wherein, FlagA ═ 1 indicates the input power interconnection coordination function, and FlagA ═ 0 indicates the cut power interconnection coordination function; load rate RoL of any cell i >＝RoL th (ii) such that FlagB is 1, otherwise FlagB is 0; according to the power to be transferred of the energy storage PCS of each area obtained by calculation in the steps S1-S5, the master control fusion terminal issues a power instruction to be transferred of the energy storage PCS of each area to the energy storage communication middle computer of each area according to the following formula by combining flag bits FlaGA and FlagB, and forwards the power instruction to the fusion terminal of each area:
P T_i ＝P T_i ·FlagA·FlagB (1.9)。
further, the communication gateway should include at least 2 RJ45 interfaces and 2 optical fiber interfaces; the fusion terminal is connected with a first path of RJ45 interface of the gateway 1 through a network port, a second path of RJ45 interface of the gateway 1 is connected with an RJ45 interface of the energy storage communication central computer 1, a first path of optical fiber interface of the gateway 1 is connected with a second path of optical fiber interface of the gateway 2, the first path of optical fiber interface of the gateway 2 is connected with a second path of interface of the gateway 3, and the like are carried out until a first path of optical fiber interface of the gateway n is connected with a second path of optical fiber interface of the gateway 1, so that optical ring network communication is formed; the energy storage communication central computer at least comprises 3 RJ45 interfaces, a first RJ45 interface of the energy storage communication central computer 1 is connected with a second RJ45 interface of the gateway 1, a second RJ45 interface of the energy storage communication central computer 1 is connected with an RJ45 interface of the energy storage PCS converter equipment, and a third RJ45 interface of the energy storage communication central computer 1 is connected with an RJ45 interface of the energy storage BMS device.
Furthermore, an alternating current side electrical connector of the energy storage PCS converter device is connected with the transformer area alternating current, a direct current side electrical connector of the energy storage PCS converter device is connected with direct current side electrical connectors of other energy storage PCS converter devices to form a cross-transformer area direct current side bus sharing energy storage connection structure, an electrical connector 1 of the energy storage BMS device is connected with an energy storage battery, and an electrical connector 2 of the energy storage BMS device is connected with a direct current side bus.
Furthermore, the communication gateway supplies power through an uninterrupted power supply UPS (uninterrupted power supply) device of the energy storage system and is used as a standby power supply under the power failure condition of the transformer area; the fusion terminal receives electrical quantity data sent by a plurality of intelligent fusion terminals and a plurality of energy storage communication intermediate computers; the intelligent fusion terminal is connected with other equipment through one or more of a wireless public network, an RS485 mode and an HPLC mode; and the energy storage communication central computer receives a power regulation and control instruction sent by the fusion terminal through an RJ45 interface and forwards the power regulation and control instruction to the energy storage PCS converter.
The invention and the preferred scheme thereof have the following advantages or beneficial effects: the main control fusion terminal calculates the power interconnection mutual aid power instruction of each fusion terminal in a unified way, and the energy storage power constraint is comprehensively considered, so that the sharing energy storage system participates in the distribution transformer load rate balance, the energy storage resource utilization rate is improved, and the overload operation loss of the distribution transformer is reduced.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic overall flow chart of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a communication connection manner and an electrical connection according to an embodiment of the present invention.
Detailed Description
Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present application can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present application.
In order to make the features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail as follows:
as shown in fig. 1, the platform load balancing control method based on the intelligent convergence terminal and the shared energy storage system provided in this embodiment is based on a system as shown in fig. 2, and includes an intelligent convergence terminal, a communication gateway, an energy storage communication intermediate computer, an energy storage PCS converter device, and an energy storage BMS device; and is made up of a plurality of interconnected lands.
The intelligent fusion terminal is used for acquiring energy storage system operation information sent by a mid-position machine in energy storage communication connected below a local station area, acquiring station area load rate and split-phase active power and reactive power information of a low-voltage power distribution network, acquiring energy storage system operation information sent by other station area intelligent fusion terminals, station area load rate and split-phase active power and reactive power information, calculating station area balance load rate at the edge, and generating a power instruction of an energy storage PCS converter required by load balance;
the communication gateway is used for providing communication conversion between the network interface and the optical fiber interface and is used for being connected with other communication gateways according to optical fibers to form a communication ring network, so that the communication reliability is improved;
the energy storage communication central computer is used for collecting running information of the energy storage BMS device connected downwards, collecting running information of the energy storage PCS converter device connected downwards, receiving a power instruction sent by the intelligent fusion terminal and forwarding the power instruction to the energy storage PCS converter device;
the energy storage PCS converter equipment is used for realizing power conversion between direct current and alternating current, responding to and executing a power instruction issued by the energy storage communication central computer through an RJ45 interface and uploading operation information of the energy storage PCS converter;
the energy storage BMS equipment is used for managing the charging and discharging of the energy storage battery, stabilizing and sharing the voltage of the energy storage direct current bus and compensating a power gap;
the UPS equipment is used for supplying electric energy to the communication gateway and supplying electric energy to the communication gateway under the condition of power failure in the transformer area, and communication stability is maintained.
The method scheme as the main body specifically comprises the following steps:
step S1: when the shared energy storage system based on the fusion terminals starts to operate, according to the number of the fusion terminals, a master multi-slave mode is combined with the preset fusion terminal priority, the fusion terminal of a certain platform area is selected as a master control fusion terminal, and communication connection is established between the fusion terminal of the certain platform area and the fusion terminals of other platform areas;
step S2: judging whether the slave convergence terminals of each station area inquire the master control convergence terminal to normally communicate;
the slave convergence terminal communicates with the master convergence terminal respectively and inquires the master convergence terminal for a plurality of times about the working state bit. If the master control fusion terminal is still in the communication abnormal state after being inquired for many times, the master control fusion terminal is transferred to the fusion terminal with the next priority according to the preset fusion terminal priority, master-slave relation communication is reestablished, and the judgment of the step S2 is carried out again; and if the master control fusion terminal can not be determined to belong to by polling all the fusion terminal priority sequences, feeding back a shared energy storage abnormal working alarm signal and stopping the subsequent power interconnection mutual aid function.
The slave convergence terminal communicates with the master convergence terminal respectively and inquires the master convergence terminal for a plurality of times about the working state bit. If the feedback of the master control fusion terminal is normal in communication, the master control fusion terminal acquires the operation mode of the energy storage communication central computer of each area and confirms the number n of the areas capable of participating in power interconnection and mutual assistance.
Step S3: judging whether a transformer area is in an emergency power supply mode or not;
all the fusion terminals are in a normal working mode, and the fusion terminals which belong to the same distribution room collect the running data of the energy storage system connected with the lower computer of the energy storage communication for multiple times at fixed time intervals through the communication gateway and calculate the average value of the electric quantity. The main control fusion terminal acquires the average value data of the electric quantity of n district fusion terminals participating in power interconnection and mutual aid at a time according to a fixed time interval through a subscription mechanism.
If there is a certain area convergence terminal in the emergency power supply mode, after the master control convergence terminal obtains the slave convergence terminal emergency power-conserving state word, the master control convergence terminal takes over the control right of the convergence terminal of the emergency power supply area, and reduces the number n of the participating power interconnection mutual aid areas obtained in the step S2 by 1. And the main control fusion terminal collects the running data of the energy storage PCS converter device connected with the energy storage communication intermediate computer in the emergency power station area for a plurality of times at fixed time intervals and calculates the average value. And the calculated average value of the load power of the emergency power supply station area is uniformly distributed to the rest n-1 station areas participating in power interconnection and mutual assistance.
The main control fusion terminal obtains the average value data of the electric quantities of other fusion terminals, including but not limited to: distribution capacity of each area: s. the i And load ratio of distribution transformer: RoL i Split-phase voltage, current, active power, reactive power and power factor, energy storage PCS capacity S pcs_i PCS operating mode, PCS operating power: p pcs_i And an energy storage system SOC: SOC (system on chip) i And the electric quantity of the energy storage system such as real-time power and the like and the working state position of the fusion terminal.
Step S4: the master control fusion terminal acquires information of interconnected mutual aid transformer areas, and solves the transfer power required by each transformer area by taking the load rate of each transformer area as a target; the method specifically comprises the following steps:
1. based on load rate RoL of each region i The average load rate of n cells participating in power interconnection is calculated as follows.
2. Calculating mutual-aid power P of energy storage PCS participation of each station area T_i . Definition P T_i <0 represents the AC to DC feed of electrical energy, P T_i >0 represents the direct current to alternating current feed-out power. Definition of RoL lim The load factor is the upper limit value of the distribution transformation load factor. Calculated as follows:
step S5: judging whether the surplus power of the direct-current side bus meets the energy storage power constraint condition or not; the method specifically comprises the following steps:
1. calculating the surplus power P of the direct current bus without taking the absorption of the energy storage battery into account according to the following formula bus0 。
Wherein, P bus0 <And 0, indicating that surplus power exists in the direct current bus, the energy storage battery participates in surplus power absorption of the transformer area, and the energy storage battery is in a charging state. P is bus0 >And 0, indicating the notch power of the direct current bus, and enabling the energy storage battery to participate in the notch power supplement of the transformer area, so that the energy storage battery is in a discharging state.
2. The master control fusion terminal obtains the charging and discharging power limit value of the energy storage battery in each area, wherein the charging power limit value is P charge_lim_i Discharge power limit P discharge_lim_i Respectively calculating the total power limit P of charge and discharge according to the following formula charge_lim And P discharge_lim 。
3. The surplus power P of the direct current bus, which is obtained by calculation according to the step S4 and does not take the absorption of the energy storage battery into account bus0 Positive-negative relation of (D), judging P bus0 And whether the charging and discharging power limit value of the energy storage battery is met or not.
If P bus0 <0, the energy storage battery participates in the absorption of the surplus power of the direct current bus, and the surplus power P of the direct current bus absorbed by the energy storage battery is taken into account bus The requirements are as follows:
-P charge_lim ≤P bus ≤0 (1.6)
if P bus0 >0, the energy storage battery participates in the supplement of the notch power of the direct current bus, and the surplus power P of the direct current bus absorbed by the energy storage battery is taken into consideration bus The requirements are as follows:
0≤P bus ≤P discharge_lim (1.7)
4. if the direct current bus power which does not satisfy the formulas (1.6) and (1.7) exists, the common energy storage battery can not absorb the direct current bus power, and the required transfer power of each station area needs to be reduced according to the following formula:
step S6: and the master control fusion terminal issues power instructions to each area PCS converter device and forwards the power instructions to each area fusion terminal.
All the fusion terminals are provided with a power interconnection mutual-aid function enabling bit FlagA and a heavy-load threshold value RoL th The trigger bit flag b. The cloud master station can directly modify flag A and RoL th . Where, FlagA ═ 1 indicates the input power interconnection coordination function, FlagA ═ 0 indicates the cut power interconnection coordination function, and the FlagA initial value can be set to 1. Load rate RoL of any cell i >＝RoL th So that FlagB is 1, otherwise FlagB is 0, RoL th The initial value may be configured to be 65%. According to the power to be transferred of the energy storage PCS of each area obtained by calculation in the steps of S1-S5, the master control fusion terminal issues a power instruction to be transferred of the energy storage PCS of each area to the energy storage communication intermediate computer of each area according to the following formula by combining flag bits FlaGA and FlagB, and forwards the power instruction to the fusion terminal of each area:
P T_i ＝P T_i ·FlagA·FlagB (1.9)
as shown in fig. 2, in this embodiment, the communication gateway should include at least 2 RJ45 interfaces and 2 optical fiber interfaces, the intelligent convergence terminal is connected to the first RJ45 interface of the gateway 1 through a network port, the second RJ45 interface of the gateway 1 is connected to the RJ45 interface of the energy storage communication central computer 1, the first optical fiber interface of the gateway 1 is connected to the second optical fiber interface of the gateway 2, the first optical fiber interface of the gateway 2 is connected to the second optical fiber interface of the gateway 3, and so on until the first optical fiber interface of the gateway n is connected to the second optical fiber interface of the gateway 1, thereby forming optical fiber ring network communication; the energy storage communication intermediate computer at least comprises 3 RJ45 interfaces, a first path of RJ45 interface of the energy storage communication intermediate computer 1 is connected with a second path of RJ45 interface of the gateway 1, a second path of RJ45 interface of the energy storage communication intermediate computer 1 is connected with an RJ45 interface of the energy storage PCS converter equipment, and a third path of RJ45 interface of the energy storage communication intermediate computer 1 is connected with an RJ45 interface of the energy storage BMS equipment.
In this embodiment, the ac-side electrical connector of the energy storage PCS device is connected to the station ac, the dc-side electrical connector is connected to the dc-side electrical connector of another energy storage PCS device, so as to form a dc-side bus sharing energy storage connection structure across the station, the electrical connector 1 of the energy storage BMS device is connected to the energy storage battery, and the electrical connector 2 of the energy storage BMS device is connected to the dc-side bus.
In this embodiment, the communication gateway supplies power through an uninterruptible power supply UPS device of the energy storage system, and supports normal communication of the communication gateway as a backup power supply under a power failure condition in the distribution room.
In this embodiment, the intelligent fusion terminal is equipped with the electric quantity data that the host computer sent in a plurality of intelligent fusion terminal, a plurality of energy storage communication of receipt.
In this embodiment, the intelligent integrated terminal is connected with other devices through a wireless public network, an RS485 mode and an HPLC mode.
In this embodiment, the energy storage communication central computer has a data forwarding function of receiving a power regulation and control instruction sent by the intelligent fusion terminal through an RJ45 interface and forwarding the power regulation and control instruction to the energy storage PCS converter.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
The present invention is not limited to the above preferred embodiments, and any other various types of cell load balancing control methods based on the intelligent convergence terminal and the shared energy storage system can be obtained according to the teaching of the present invention.
Claims (10)
1. A platform load balance control method based on an intelligent fusion terminal and a shared energy storage system is characterized in that based on a platform model formed by a plurality of interconnected shared energy storage systems, each shared energy storage system is formed by a fusion terminal, a communication gateway, an energy storage communication intermediate computer, an energy storage PCS converter and an energy storage BMS device which are connected in sequence;
the method comprises the following steps:
step S1: when the shared energy storage system is started to operate, selecting a fusion terminal of a certain platform area as a master control fusion terminal according to the number of the fusion terminals, a master-slave mode and a preset fusion terminal priority, and establishing communication connection with fusion terminals of other platform areas;
step S2: judging whether the slave convergence terminals of each station area inquire the master control convergence terminal to normally communicate;
step S3: judging whether a transformer area is in an emergency power supply mode;
step S4: the master control fusion terminal acquires information of interconnected mutual aid transformer areas, and solves the transfer power required by each transformer area by taking the load rate of each transformer area as a target;
step S5: judging whether the surplus power of the direct-current side bus meets an energy storage power constraint condition or not;
step S6: and the master control fusion terminal issues power instructions to the energy storage PCS converter devices of each transformer area and forwards the power instructions to the fusion terminals of each transformer area.
2. The platform area load balancing control method based on the intelligent fusion terminal and the shared energy storage system according to claim 1, characterized in that:
step S2 specifically includes:
the slave convergence terminal communicates with the master control convergence terminal respectively and inquires the working state bit of the master control convergence terminal for many times; if the master control fusion terminal is still in the communication abnormal state after being inquired for many times, the master control fusion terminal is transferred to the fusion terminal with the next priority according to the preset fusion terminal priority, master-slave relation communication is reestablished, and the judgment of the step S2 is carried out again; if the master control fusion terminal attribution still cannot be determined by polling all the fusion terminal priority sequences, feeding back a shared energy storage working abnormal alarm signal and stopping the power interconnection and mutual assistance function;
the slave convergence terminal communicates with the master convergence terminal respectively and inquires the working state bit of the master convergence terminal for multiple times; if the feedback of the master control fusion terminal is normal in communication, the master control fusion terminal acquires the operation mode of the energy storage communication central computer of each area and confirms the number n of the areas capable of participating in power interconnection and mutual assistance.
3. The platform area load balancing control method based on the intelligent convergence terminal and the shared energy storage system according to claim 2, characterized in that:
step S3 specifically includes:
setting all the fusion terminals in a normal working mode, collecting the operation data of an energy storage system connected with a central computer of energy storage communication for multiple times through a communication gateway according to a fixed time interval and calculating an average value of electric quantity by the fusion terminals belonging to one distribution area; the main control fusion terminal acquires the average value data of the electric quantity of n station area fusion terminals participating in power interconnection and mutual aid at a time at fixed time intervals through a subscription mechanism;
if a certain area convergence terminal is in the emergency power supply mode, after the master control convergence terminal acquires the slave convergence terminal emergency power-conserving state word, the master control convergence terminal takes over the control right of the convergence terminal of the emergency power supply area, and the number n of the participating power interconnection mutual aid areas obtained in the step S2 is reduced by 1; collecting the running data of an energy storage PCS converter device connected with a central computer of energy storage communication in an emergency power station area for multiple times at fixed time intervals by a master control fusion terminal and calculating an average value; and (4) the calculated load power average value of the emergency power supply area is uniformly distributed to the rest n-1 areas participating in power interconnection and mutual assistance.
4. The platform area load balancing control method based on the intelligent convergence terminal and the shared energy storage system according to claim 3, characterized in that: the main control fusion terminal acquiring the electric quantity average value data of other fusion terminals comprises the following steps: distribution capacity of each area: s i And load ratio of distribution transformer: RoL i Split-phase voltage, current, active power, reactive power and power factor, energy storage PCS capacity S pcs_i PCS operating mode, PCS operating power: p pcs_i And an energy storage system SOC: SOC i And the electric quantity of the energy storage system such as real-time power and the like and the working state position of the fusion terminal.
5. The platform area load balancing control method based on the intelligent convergence terminal and the shared energy storage system according to claim 4, characterized in that:
step S4 specifically includes:
step S41: based on load rate RoL of each region i Calculating the average load rate of the n regions participating in power interconnection as follows:
step S42: calculating mutual-aid power P of energy storage PCS of each station area T_i (ii) a Definition P T_i <0 represents the AC to DC feed-in of electrical energy, P T_i >0 represents that the direct current feeds out electric energy to the alternating current; definition of RoL lim The load factor is the upper limit value of the distribution transformer load factor; calculated as follows:
6. the platform area load balancing control method based on the intelligent convergence terminal and the shared energy storage system according to claim 5, characterized in that:
step S5 specifically includes:
step S51: calculating the surplus power P of the direct current bus without taking the absorption of the energy storage battery into account according to the following formula bus0 ：
Wherein, P bus0 <0, indicating that surplus power exists in the direct current bus, the energy storage battery participates in surplus power absorption of the transformer area, and the energy storage battery is in a charging state; p bus0 >0, indicating the gap power of the direct current bus, enabling the energy storage battery to participate in the gap power supplement of the distribution room, and enabling the energy storage battery to be in a discharging state;
step S52: the master control fusion terminal acquires the charging and discharging power limit value of the energy storage battery in each area, wherein the charging power limit value is P charge_lim_i Discharge power limit P discharge_lim_i Respectively calculating the total power limit P of charge and discharge according to the following formula charge_lim And P discharge_lim ：
Step S53: according to the DC bus surplus power P which is obtained by calculation in the step S4 and does not take the energy storage battery absorption into account bus0 Positive-negative relation of (D), judging P bus0 Whether the charging and discharging power limit value of the energy storage battery is met or not;
if P bus0 <0, the energy storage battery participates in the absorption of the surplus power of the direct current bus, and the surplus power P of the direct current bus absorbed by the energy storage battery is taken into account bus The requirements are as follows:
-P charge_lim ≤P bus ≤0 (1.6)
if P bus0 >0, the energy storage battery participates in the supplement of the notch power of the direct current bus, and the surplus power P of the direct current bus absorbed by the energy storage battery is taken into consideration bus The requirements are as follows:
0≤P bus ≤P discharge_lim (1.7)
step S54: if the direct current bus power which does not satisfy the formulas (1.6) and (1.7) exists, the common energy storage battery can not absorb the direct current bus power, and the required transfer power of each distribution area is reduced according to the following formula:
7. the platform area load balancing control method based on the intelligent fusion terminal and the shared energy storage system according to claim 6, characterized in that:
step S6 specifically includes:
all the converged terminals are provided with a power interconnection mutual aid function enabling bit FlagA and a heavy load threshold value RoL th A trigger bit flag b; wherein, FlagA ═ 1 indicates the input power interconnection coordination function, and FlagA ═ 0 indicates the cut power interconnection coordination function; load rate RoL of any cell i >＝RoL th (ii) such that FlagB is 1, otherwise FlagB is 0; according to the power to be transferred of the energy storage PCS of each area obtained by calculation in the steps S1-S5, the master control fusion terminal issues a power instruction to be transferred of the energy storage PCS of each area to the energy storage communication central computer of each area according to the following formula by combining flag bits FlagA and FlagB, and forwards the power instruction to the fusion terminal of each area:
P T_i ＝P T_i ·FlagA·FlagB (1.9)。
8. the platform area load balancing control method based on the intelligent fusion terminal and the shared energy storage system according to claim 1, characterized in that: the communication gateway should include at least 2 RJ45 interfaces and 2 optical fiber interfaces; the fusion terminal is connected with a first path of RJ45 interface of the gateway 1 through a network port, a second path of RJ45 interface of the gateway 1 is connected with an RJ45 interface of the energy storage communication central computer 1, a first path of optical fiber interface of the gateway 1 is connected with a second path of optical fiber interface of the gateway 2, a first path of optical fiber interface of the gateway 2 is connected with a second path of interface of the gateway 3, and the like until a first path of optical fiber interface of the gateway n is connected with a second path of optical fiber interface of the gateway 1, so that optical fiber ring network communication is formed; the energy storage communication central computer at least comprises 3 RJ45 interfaces, a first RJ45 interface of the energy storage communication central computer 1 is connected with a second RJ45 interface of the gateway 1, a second RJ45 interface of the energy storage communication central computer 1 is connected with an RJ45 interface of the energy storage PCS converter equipment, and a third RJ45 interface of the energy storage communication central computer 1 is connected with an RJ45 interface of the energy storage BMS device.
9. The platform area load balancing control method based on the intelligent convergence terminal and the shared energy storage system according to claim 8, wherein: the alternating current side electrical connector of the energy storage PCS converter device is connected with the transformer area alternating current, the direct current side electrical connector of the energy storage PCS converter device is connected with the direct current side electrical connectors of other energy storage PCS converter devices to form a cross-transformer area direct current side bus sharing energy storage connection structure, the electrical connector 1 of the energy storage BMS device is connected with an energy storage battery, and the electrical connector 2 of the energy storage BMS device is connected with the direct current side bus.
10. The platform area load balancing control method based on the intelligent convergence terminal and the shared energy storage system according to claim 8, wherein: the communication gateway supplies power through an uninterrupted power supply UPS (uninterrupted Power supply) device of the energy storage system and is used as a standby power supply under the power failure condition of the transformer area; the fusion terminal receives electrical quantity data sent by a plurality of intelligent fusion terminals and a plurality of energy storage communication intermediate computers; the intelligent fusion terminal is connected with other equipment through one or more of a wireless public network, an RS485 mode and an HPLC mode; and the energy storage communication central computer receives a power regulation and control instruction sent by the fusion terminal through an RJ45 interface and forwards the power regulation and control instruction to the energy storage PCS converter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN116996011A (en) * | 2023-08-02 | 2023-11-03 | 北京垒实科技有限公司 | Distributed photovoltaic flexible regulator based on carrier communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN116996011A (en) * | 2023-08-02 | 2023-11-03 | 北京垒实科技有限公司 | Distributed photovoltaic flexible regulator based on carrier communication |
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