Energy control system of energy storage power station

Abstract

The utility model discloses an energy control system of an energy storage power station. The energy control system comprises an energy controller, a battery energy storage system comprising an energy storage converter, an anti-countercurrent gateway ammeter, an anti-overload gateway ammeter and an energy storage station metering ammeter, the battery energy storage system is connected with a first port of the energy controller; the anti-countercurrent gateway ammeter, the anti-overload gateway ammeter and the energy storage station metering ammeter are connected with a second port of the energy controller. The energy controller collects data of the anti-countercurrent gateway electricity meter, the anti-overload gateway electricity meter and the energy storage station metering electricity meter through a second port and generates a power adjusting instruction; and the energy controller sends the power adjustment instruction to the energy storage converter through the first port. According to the energy control system of the energy storage power station provided by the embodiment of the utility model, a hand-in-hand wiring mode is adopted, so that the energy controller can quickly know the electricity utilization change condition of a user and generate an instruction for adjusting the charging and discharging power of the energy storage power station, and the energy storage power station is prevented from outputting reverse power to a power grid.

Description

Technical Field

[0001] The utility model relates to the field of energy storage power station control, in particular to an energy control system for an energy storage power station. Background Art

[0002] With the continuous development of society and economy, the demand for electricity is increasing continuously, and the operation of the power system is undergoing great changes. On the one hand, the difference between the peak and valley of the grid power consumption is intensifying, and the contradiction of peak shaving is becoming increasingly prominent. The power consumption load during the day is very large, and in some places, power rationing even has to be carried out. However, the power consumption at midnight is very small, and a lot of power generation capacity is wasted in vain. Moreover, at low loads, the power generation efficiency is significantly reduced. And as the difference between the peak and valley continues to widen, the installed capacity of the existing system will be difficult to meet the demand of the peak load. Without a good energy storage medium, the power grid must be planned according to the maximum power consumption load, requiring the construction of power plants and power transmission and distribution systems that can support the maximum peak of the load power consumption, resulting in a very low utilization rate of the facilities during the off-peak period. Energy storage is recognized by the industry as one of the best solutions to solve the above problems. During the operation of an energy storage power station, the EMS (Energy Management System) is an important part of the energy storage system.

[0003] However, the existing EMS is responsible for the control and data transmission of the power station. Due to the large amount of data, there is a large delay in obtaining key data. During the actual operation of the power station, when the user load changes rapidly, phenomena such as reverse power supply and exceeding the maximum demand are likely to occur. Reverse power supply will have an adverse impact on the power grid and will also cause great damage to the power station's revenue. Exceeding the maximum demand will make users bear more electricity bills, which is not conducive to the popularization of energy storage power stations. Summary of the Utility Model

[0004] The embodiment of the utility model provides an energy control system for an energy storage power station, which realizes rapid response of the gateway power, prevents the energy storage power station from outputting reverse power to the power grid, and optimizes the control of the user's maximum demand.

[0005] In order to solve the above technical problems, the embodiment of the utility model provides an energy control system for an energy storage power station, including: an energy controller, a battery energy storage system, a reverse power prevention gateway electric meter, an overload prevention gateway electric meter, and an energy storage station metering electric meter;

[0006] Wherein, the battery energy storage system is connected to the first port of the energy controller; the battery energy storage system includes an energy storage converter;

[0007] The reverse power prevention gateway electric meter is connected to the second port of the energy controller, the overload prevention gateway electric meter is connected to the second port of the energy controller, and the energy storage station metering electric meter is connected to the second port of the energy controller;

[0008] The energy controller collects data from the anti-counterflow gateway meter, the anti-overload gateway meter, and the energy storage station metering meter through the second port and generates a power adjustment instruction; the energy controller sends the power adjustment instruction to the energy storage converter through the first port.

[0009] Implementing the embodiments of the present utility model, a daisy-chain wiring method is adopted between the energy controller, the anti-counterflow gateway meter, the anti-overload gateway meter, and the energy storage station metering meter, so that through the energy controller, the data of the anti-counterflow gateway meter, the anti-overload gateway meter, and the energy storage station metering meter can be quickly read to obtain the user's power consumption change situation in real time and generate a power adjustment instruction, and then the power adjustment instruction is sent to the energy storage converter. Using this power adjustment instruction, the charge and discharge power of the energy storage power station can be quickly adjusted to achieve the goal of rapid response of the gateway power, thereby preventing the energy storage power station from outputting reverse power to the power grid, providing the control accuracy of the user's maximum demand, reducing the user's electricity bill expenditure, and increasing the power station's revenue. In addition, through the cooperation of the energy controller and various meters, the state of the energy storage system and the power flow direction can be monitored in real time to ensure that the operation of the energy storage power station is within the set range and avoid overload or reverse current phenomena in the system.

[0010] As a preferred solution, the battery energy storage system further includes a network switch;

[0011] Wherein, the network switch is connected to the first port of the energy controller;

[0012] The network switch sends the power adjustment instruction output by the energy controller to the energy storage converter through the first port.

[0013] Implementing the preferred solution of the embodiments of the present utility model, the power adjustment instruction is directly transmitted to the energy storage converter through the network switch, simplifying the control logic of the system, reducing the physical connections between different components, thereby reducing the complexity and failure points of the system. The introduction of the network switch enables the energy controller to monitor the state of the battery energy storage system in real time and adjust the power output according to actual needs, ensuring the stability of the system and the reliability of power supply.

[0014] As a preferred solution, the battery energy storage system further includes an energy storage station metering meter and a battery management system;

[0015] Wherein, the energy controller adopts the TCP communication method and communicates with the energy storage converter and the battery management system respectively through the network switch.

[0016] Implementing the preferred embodiment of the present utility model, through TCP communication, the energy controller can receive and send data from the energy storage converter and the battery management system in real time. This enables the energy controller to monitor and adjust the state of the energy storage system in real time, optimize the energy storage and discharge processes, improve the operating efficiency of the system, and the TCP communication protocol provides an error detection and retransmission mechanism, which can improve the reliability of data transmission. Based on this, the network switch can effectively manage the communication between different devices, reduce communication interference, and ensure the stability of system operation. In addition, as the central node, the network switch can effectively manage the data flow between the energy storage converter and the battery management system.

[0017] As a preferred solution, the data transmission direction between the network switch and the energy storage converter is two-way transmission; the data transmission direction between the network switch and the battery management system is two-way transmission; the data transmission direction between the network switch and the energy storage station metering meter in the battery energy storage system is two-way transmission; the data transmission direction between the network switch and the energy controller is two-way transmission.

[0018] Implementing the preferred embodiment of the present utility model, the data transmission directions between the network switch and the energy storage converter, the battery management system, the energy storage station metering meter in the battery energy storage system, and the energy controller are all two-way transmissions. This enables the energy control system of the energy storage power station to perform comprehensive information exchange and real-time control, improving the monitoring and management capabilities of the operating state of the energy storage system. In addition, the two-way data transmission allows not only receiving data but also sending feedback information between various parts of the system, realizing two-way communication of real-time data, ensuring that the system can respond to various changes and requirements in a timely manner, so that it can better coordinate the work of various parts, perform dynamic adjustment and optimization, and improve the flexibility and adaptability of the system.

[0019] As a preferred solution, the second port of the energy controller is connected to the RS485 interface;

[0020] Among them, the data transmission direction between the RS485 interface and the anti-backflow gateway meter is one-way transmission, the data transmission direction between the RS485 interface and the anti-overload gateway meter is one-way transmission, and the data transmission direction between the RS485 interface and the energy storage station metering meter is one-way transmission.

[0021] Implementing the preferred embodiment of the present utility model, the one-way data transmission mode of the RS485 interface can reduce data conflicts, ensure the accurate transmission of data, and improve the communication stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1: It is a schematic structural diagram of an energy control system for an energy storage power station provided in the first embodiment of the present invention. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0024] Embodiment 1:

[0025] It should be noted that advanced energy storage technologies can shave peaks and fill valleys, obtain electric energy from the power grid for charging during the low load period of the power grid, and deliver electric energy to the power grid during the peak load period of the power grid, greatly reducing the peak-valley difference of power consumption in the power grid, helping to reduce the losses of the system's transmission network, slowing down or replacing the construction of new power plants, meeting the growing peak load demand, improving the energy utilization efficiency and the overall asset utilization rate of the power grid, and changing the construction mode of the existing power system, promoting its transformation from an extensive expansion type to an intensive efficiency improvement type, thereby scientifically reducing carbon emissions, achieving the purpose of energy conservation and emission reduction, and promoting the "peak carbon dioxide emissions and carbon neutrality" in the energy field. During the operation of the energy storage power station, the energy management system is an important part of the energy storage system, and regulates the charging and discharging power of the energy storage power station by specifying the power of the energy storage converter. The energy management system is an extremely important core component in the entire energy storage system and the control center of the entire energy storage power station. It is responsible for communication with the dispatching, monitors the power station equipment and the entire energy storage system, and controls the charging and discharging process to achieve the optimal energy use efficiency, system performance, and optimal working state. Peak-valley arbitrage is the main revenue model. With the increase in the scale and volume of the energy storage power station, to ensure the all-round optimal operation and maximum economic benefits of the energy storage power station, on the premise of ensuring the safe and stable power supply for users, the energy storage power station EMS needs to support and adapt to multi-scenario applications and multi-functional implementation, comprehensively consider the scheduling requirements of various complex scenarios, so as to ensure the flexibility, safety, and high efficiency of the operation of the energy storage power station.

[0026] Please refer to Figure 1 , which is a schematic structural diagram of an energy control system for an energy storage power station provided in the embodiments of the present invention. The device includes: an energy controller 1, a battery energy storage system 8, an anti-backflow gateway meter 5, an anti-overload gateway meter 6, and an energy storage station metering meter 7.

[0027] Among them, the battery energy storage system 8 is connected to the first port of the energy controller 1; the battery energy storage system 8 includes an energy storage converter 3. The anti-counterflow gateway meter 5 is connected to the second port of the energy controller 1, the anti-overload gateway meter 6 is connected to the second port of the energy controller 1, and the energy storage station metering meter 7 is connected to the second port of the energy controller 1. The energy controller 1 collects data from the anti-counterflow gateway meter 5, the anti-overload gateway meter 6, and the energy storage station metering meter 7 through the second port and generates a power adjustment command. The energy controller 1 sends the power adjustment command to the energy storage converter 3 through the first port to control and adjust the active power and reactive power of the energy storage converter 3, so as to achieve the purpose of controlling the power factor of the user load.

[0028] In this embodiment, the energy controller 1 adjusts the output power adjustment command in real time by collecting the power data of the anti-counterflow gateway meter 5 and the anti-overload gateway meter 6 in real time and combining the operating power data of the energy storage converter collected from the energy storage station metering meter 7, so as to realize the anti-counterflow control and demand control of the energy storage power station. Among them, when the energy storage power station is discharging normally, it outputs reactive power to compensate for the reactive power of the user load, so that the power factor of the user is above the normal assessment level. At the same time, the compensation range and compensation conditions are set, taking into account the benefits of the energy storage power station. Among them, the power adjustment command output by the energy controller 1 includes active power P1 and reactive power P2.

[0029] In addition, the energy controller 1 not only realizes the data collection and control related to the control function, but also classifies the data, preferentially collects the core key data required under different operating conditions according to different operating conditions, improves the response time of the control, prevents the energy storage power station from outputting reverse power to the power grid, and improves the control accuracy of the user's maximum demand. In the control logic of the energy storage power station, the meter collection method and power factor control are optimized to achieve the purpose of the energy storage power station following the change of the user's electrical load in real time. The process of using the energy controller 1 to realize the control of the energy storage power station includes steps S1 to S6, and the specific steps are as follows:

[0030] Step S1, the energy controller 1 adopts a peak shaving and valley filling plan, outputs active power PZ1, and judges whether PZ1 is equal to 0. If so, execute step S2; if not, execute step S3.

[0031] Step S2, the energy controller 1 executes the acquisition mode C, collects key data from the anti-counterflow gateway meter 5, the anti-overload gateway meter 6, and the energy storage station metering meter 7, and then returns to execute step S1.

[0032] Step S3, judge whether PZ1 is greater than 0. If not, execute step S4; if so, execute step S5.

[0033] Step S4: The energy controller 1 executes the acquisition mode B, collects key data from the anti-counterflow gateway meter 5, the anti-overload gateway meter 6, and the energy storage station metering meter 7, then calculates the active power PZ2 according to the anti-overload control strategy, then performs the demand control strategy operation, calculates the active power P1 based on the active power PZ2, and then executes step S6.

[0034] Step S5: The energy controller 1 executes the acquisition mode A, collects key data from the anti-counterflow gateway meter 5, the anti-overload gateway meter 6, and the energy storage station metering meter 7, then calculates the active power P1 according to the anti-counterflow control strategy, and then executes step S6.

[0035] Step S6: Perform the power factor control strategy operation, calculate the reactive power P2 based on the active power P1, then send the active power P1 and the reactive power P2 to the PCS (Power Conversion System, energy storage converter), and then return to execute step S1.

[0036] It should be noted that due to the operational requirements of the energy storage power station, the energy storage power station operation platform often requires all meters to have data including at least: forward active power consumption (total, peak, peak, flat, valley), forward reactive power consumption (total, peak, peak, flat, valley), reverse active power consumption (total, peak, peak, flat, valley), three-phase voltage, three-phase current, active power, reactive power, apparent power, current demand, maximum demand and occurrence time, etc. More than 20 data. The energy controller 1 communicates with the anti-backflow gate meter 5, the anti-overload gate meter 6, and the energy storage station metering meter 7 using the DLT645 protocol. The DLT645 protocol is a polling-type one-question-one-answer communication method. It takes more than ten seconds or even longer to collect data one by one. However, the user load generally changes quickly, and the data acquisition speed of the meter directly affects the control response speed of the energy storage power station. It is easy for the energy storage power station to reverse to the public network and the maximum demand exceeds the expected standard, affecting the power quality of the power grid and the income of the energy storage power station. In order to improve the control response speed of the energy storage power station, the utility model adopts a round-robin method to collect key data, giving priority to quickly collecting control-related data. The specific collection method is as follows: First, the data required to be collected by the anti-backflow gate meter, the anti-overload gate meter and the energy storage station metering meter are divided into two groups. One group is control-related data (this group is marked as 1), mainly including the active power of the anti-backflow meter (the collection order is represented by 1.1 below) and the apparent power of the anti-overload meter (the collection order is represented by 1.2 below), and the other group is other data required by the platform except 1.1 and 1.2 (this group is marked as 2, and the collection order is represented by 2.1 below. The first data in this group, 2.2 represents the second data in this group, and so on). Secondly, the collection program selects one of the collection modes A, B and C according to the actual operating conditions, and collects key data from the anti-backflow gate meter 5, the anti-overload gate meter 6 and the energy storage station metering meter 7. Among them, the above three collection modes are as follows:

[0037] ① Collection mode A:

[0038] 1.1→2.1→1.1→2.2→1.1→2.3→1.1......and so on. After collecting the last data in 2, start collecting again from 2.1 in a loop.

[0039] In this way, the update time of control-related data can be guaranteed to be within 500ms.

[0040] ② Collection mode B:

[0041] 1.1→1.2→2.1→1.1→1.2→2.2→1.1→1.2→2.3→1.1→1.2→2.4→......and so on. After the last data in 2 is collected, start collecting data in a loop from 2.1.

[0042] ③ Acquisition mode C:

[0043] 1.1 → 1.2 → 2.1 → 2.2 → 2.3 → 2.4 →...... and so on. After collecting the last data in 2, start cyclic acquisition from 1.1 again.

[0044] In this embodiment, the power factor control algorithm is as follows:

[0045] Adopt the peak shifting and valley filling strategy and the demand control strategy - the energy controller calculates the active power P1 of the energy storage converter in real time and judges whether the active power P1 of the energy storage converter is greater than 5 kW.

[0046] If the active power P1 of the energy storage converter is less than or equal to 5 kW, it indicates that the energy storage converter is in the charging state. At this time, the reactive power P2 of the energy storage converter is 0.

[0047] If the active power P1 of the energy storage converter is greater than 5 kW, it indicates that the energy storage converter is in the discharging state, and the reactive power P3 of the user is collected in real time; if |P3| < P * k, then control and adjust the reactive power P2 of the energy storage converter = -P3; if |P3| ≥ P * k and P3 < 0, then control and adjust the reactive power P2 of the energy storage converter = P * k; if |P3| ≥ P * k and P3 > 0, then control and adjust the reactive power P2 of the energy storage converter = -P * k. Where k is the compensation range preset in the energy controller, and its meaning is the percentage of the rated power P of the energy storage power station.

[0048] Among them, 5 kW is a preset fixed value. By presetting this fixed value and adopting different methods to determine the reactive power P2 of the energy storage converter for the two cases of being greater than 5 kW and not greater than 5 kW, the influence of PCS power fluctuation during static state can be avoided.

[0049] In a preferred embodiment, please refer to Figure 1 , the battery energy storage system 8 further includes a network switch 2; wherein, the network switch 2 is connected to the first port of the energy controller 1; the network switch 2 sends the power adjustment instruction output by the energy controller 1 to the energy storage converter 3 through the first port.

[0050] In this embodiment, the energy controller 1 realizes communication and interaction with the energy storage converter 3 and the battery management system 4 through the network switch 2. The use of the network switch allows the system to be more easily expanded and upgraded, for example, adding more energy storage converters or other monitoring devices, without the need for large-scale modification of the existing control structure. In addition, the network switch can provide a more stable and efficient data transmission channel, reducing the problems of control instruction loss or delay caused by unstable data transmission and improving the reliability of data transmission.

[0051] In a preferred embodiment, please refer to Figure 1 , the battery energy storage system 8 further includes an energy storage station metering electric meter 7 and a battery management system 4; wherein, the energy controller 1 adopts the TCP communication method and communicates with the energy storage converter 3 and the battery management system 4 respectively through the network switch 2.

[0052] In this embodiment, the energy controller 1 uses TCP communication to realize the communication and interaction with the energy storage converter 3 and the battery management system 4.

[0053] In a preferred embodiment, please refer to Figure 1 , the data transmission direction between the network switch 2 and the energy storage converter 3 is two-way transmission; the data transmission direction between the network switch 2 and the battery management system 4 is two-way transmission; the data transmission direction between the network switch 2 and the energy storage station metering electric meter 7 in the battery energy storage system 8 is two-way transmission; the data transmission direction between the network switch 2 and the energy controller 1 is two-way transmission.

[0054] In a preferred embodiment, please refer to Figure 1 , the second port of the energy controller 1 is connected to the RS485 interface; wherein, the data transmission direction between the RS485 interface and the anti-counterflow gateway electric meter 5 is one-way transmission, the data transmission direction between the RS485 interface and the anti-overload gateway electric meter 6 is one-way transmission, and the data transmission direction between the RS485 interface and the energy storage station metering electric meter 7 is one-way transmission.

[0055] In this embodiment, the energy controller 1 uses the DLT645 protocol to communicate with the anti-counterflow gateway electric meter 5, the anti-overload gateway electric meter 6, and the energy storage station metering electric meter 7 respectively through 1 RS485 interface.

[0056] Compared with the prior art, the embodiment of the present utility model has the following beneficial effects:

[0057] The utility model provides an energy control system for an energy storage power station. A hand-in-hand wiring mode is adopted between the energy controller, the reverse power prevention gateway meter, the overload prevention gateway meter and the energy storage station metering meter, so that through the energy controller, the data of the reverse power prevention gateway meter, the overload prevention gateway meter and the energy storage station metering meter can be quickly read, the user's power consumption change situation can be obtained in real time and a power adjustment instruction can be generated, and then the power adjustment instruction is sent to the energy storage converter. By using the power adjustment instruction, the charge and discharge power of the energy storage power station can be quickly adjusted to achieve the goal of rapid response of the gateway power, thereby preventing the energy storage power station from outputting reverse power to the power grid, improving the control accuracy of the user's maximum demand, reducing the user's electricity bill expenditure and increasing the power station's revenue. In addition, through the cooperation of the energy controller and various meters, the state of the energy storage system and the power flow direction can be monitored in real time to ensure that the operation of the energy storage power station is within the set range and to avoid overload or reverse current phenomena in the system.

[0058] Furthermore, through the network switch, the power adjustment instruction is directly transmitted to the energy storage converter, which simplifies the control logic of the system, reduces the physical connection between different components, thereby reducing the complexity and fault points of the system. The introduction of the network switch enables the energy controller to monitor the state of the battery energy storage system in real time and adjust the power output according to actual needs, ensuring the stability of the system and the reliability of the power supply.

[0059] The specific embodiments described above further elaborate on the purpose, technical solutions and beneficial effects of the present utility model. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the protection scope of the present utility model. It is particularly pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An energy control system for an energy storage power station, characterized in that: include: Energy controller, battery energy storage system, anti-backflow gate meter, anti-overload gate meter and energy storage station meter; Wherein, the battery energy storage system is connected to the first port of the energy controller; the battery energy storage system includes an energy storage converter; The anti-backflow gate electric meter is connected to the second port of the energy controller, the anti-overload gate electric meter is connected to the second port of the energy controller, and the energy storage station metering electric meter is connected to the second port of the energy controller; The energy controller collects data from the anti-backflow gateway meter, the anti-overload gateway meter and the energy storage station metering meter through the second port and generates a power adjustment instruction; the energy controller sends the power adjustment instruction to the energy storage inverter through the first port.

2. The energy control system of an energy storage power station according to claim 1, characterized in that: The battery energy storage system also includes a network switch; Wherein, the network switch is connected to the first port of the energy controller; The network switch sends the power adjustment instruction output by the energy controller to the energy storage inverter through the first port.

3. The energy control system of an energy storage power station according to claim 2, characterized in that: The battery energy storage system also includes an energy storage station meter and a battery management system; The energy controller uses TCP communication to communicate and interact with the energy storage inverter and the battery management system through the network switch.

4. The energy control system of an energy storage power station according to claim 3, characterized in that: The data transmission direction between the network switch and the energy storage inverter is bidirectional transmission; the data transmission direction between the network switch and the battery management system is bidirectional transmission; the data transmission direction between the network switch and the energy storage station meter in the battery energy storage system is bidirectional transmission; the data transmission direction between the network switch and the energy controller is bidirectional transmission.

5. The energy control system of an energy storage power station according to claim 1, characterized in that: The second port of the energy controller is connected to the RS485 interface; Among them, the data transmission direction between the RS485 interface and the anti-backflow gate meter is unidirectional transmission, the data transmission direction between the RS485 interface and the anti-overload gate meter is unidirectional transmission, and the data transmission direction between the RS485 interface and the energy storage station metering meter is unidirectional transmission.

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