Grid-connected energy storage system and power supply method based on grid-connected energy storage system

Abstract

The invention relates to a grid-connected energy storage system and a power supply method based on the grid-connected energy storage system. The grid-connected energy storage system comprises a plurality of energy storage machines which are in communication connection through wireless networking, and the plurality of energy storage machines are arranged on an AC bus in parallel; the AC bus is connected with commercial power; the AC bus is also connected in parallel with a plurality of load machines; the energy storage machine, the load machine and the mains supply are connected with the control module; and the mains supply is also provided with a monitoring unit for monitoring power. The invention further discloses a power supply method based on the grid-connected energy storage system, after the energy storage machines are connected in a wireless networking mode, the output power of all the energy storage machines is good according to a set command, so that the charging and discharging currents and the battery capacities of all the energy storage machines can be different during use, and the energy storage machines are convenient to use. Therefore, products of different manufacturers are adapted, great convenience is brought to old utilization and capacity expansion of a system of a user, the cost is reduced, meanwhile, stable operation of the system can be ensured, and actual use requirements are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage and power supply, and in particular relates to a grid-connected energy storage system and a power supply method based on the grid-connected energy storage system. Background Art

[0002] At present, electronic intelligent products are becoming more and more popular, and the total power demand is getting higher and higher. The traditional mains power solution can no longer meet the current user's long-term (personality changeable) power demand. In order to solve the power consumption problem, the combination of solar photovoltaic power generation and energy storage system can solve part of the power demand. However, new energy power generation such as solar energy and wind energy has the disadvantages of intermittent and randomness. The power supply system based on energy storage technology can overcome the shortcomings of new energy power generation such as wind energy and solar energy, and realize the safe and stable operation of the mains.

[0003] In the photovoltaic and energy storage industry, it is a very common application scenario for a grid-connected energy storage system consisting of photovoltaic modules and energy storage equipment to supply power to local loads. Sometimes long battery life is required, and sometimes high power is required. These personalized requirements of different local power equipment at different time periods pose a great challenge to the configuration of local grid-connected energy storage machines.

[0004] At present, in order to meet greater power demand and increase battery life, multiple energy storage power supplies are stacked in parallel to increase battery capacity for expansion. When different energy storage power supplies meet different charging and discharging requirements, there is a voltage difference between multiple energy storage power supplies, which leads to the formation of circulation between different energy storage power supplies. That is, energy flows from high-voltage energy storage power supplies to low-voltage energy storage power supplies. Once a circulation is formed between energy storage power supplies, it will damage the energy storage battery module and other devices, and even cause safety accidents.

[0005] At the same time, the traditional stacked energy storage system mainly adopts battery stacking technology. After capacity expansion, the volume becomes larger and inconvenient to move, the safety factor is low, and the high power is prone to heat, combustion and other safety hazards. It is necessary to use the energy storage main control system to connect each energy storage system with power lines and communication lines for management. When an energy storage system encounters an abnormality, it is necessary to manually go to the on-site process to check and then deal with the abnormal energy storage system. The operation is cumbersome and inconvenient, which brings many adverse effects to actual use. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a grid-connected energy storage system and a power supply method based on the grid-connected energy storage system, which has low energy consumption and failure rate, can be adapted and compatible with products of different specifications, and has high reliability and flexibility.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a grid-connected energy storage system, including a number of energy storage machines connected by wireless network communication, and a plurality of the energy storage machines are connected in parallel to the AC bus; the AC bus is connected to the commercial power; a plurality of load machines are also connected in parallel to the AC bus; the energy storage machines, the load machines and the commercial power are connected to the control module.

[0008] Further, the wireless networking refers to a network topology structure, and the wireless signal coverage range is extended through a plurality of relay nodes; the wireless networking includes WIFI, Bluetooth, 4G, Zigbee, Z-Wave, LoRa, SigFox, satellite communication, UWB.

[0009] Further, the energy storage machine is connected to the AC bus through a voltage and current double-loop control module.

[0010] Further, a monitoring unit for monitoring power is also provided on the commercial power.

[0011] Further, a current transformer is correspondingly connected to each of the energy storage machines.

[0012] A power supply method based on the grid-connected energy storage system includes the following steps:

[0013] S1. If the control module determines that the commercial power voltage is continuously greater than 80V within a certain period of time, it enters the grid-connected operation mode;

[0014] S2. When the monitoring unit monitors that a high-power load machine is working, the commercial power first supplies the load, and the monitoring unit sends the monitored effective value of the commercial power to the control module in real time, and obtains the basic physical quantity X in the circuit according to the effective value of the commercial power;

[0015] S3. The control module then drives the No. 1 energy storage machine to output X through wireless networking;

[0016] S4. When the output A1 of the No. 1 energy storage machine at full load power < X, the No. 1 energy storage machine outputs A1, and thereafter the effective value of the commercial power is X1 > 0; when the output A1 of the No. 1 energy storage machine at full load power > X, the No. 1 energy storage machine outputs X, and thereafter the effective value of the commercial power X1 = 0;

[0017] S5. When the control module receives the effective value X1 of the commercial power monitored by the monitoring unit > 0, it means that the output of the No. 1 energy storage machine is limited, and it is necessary to continue to output the No. 2 energy storage machine to the AC bus to supply the load;

[0018] S6. The control module drives the No. 2 energy storage machine to output X1 through wireless networking, and the output of the No. 2 energy storage machine is A2;

[0019] S7-a. When A2 > X1, the No. 2 energy storage machine outputs X1, and thereafter the effective value of the commercial power X2 = 0;

[0020] S7-b1. When A2 < X1, the No. 2 energy storage machine outputs A2, and thereafter the effective value of the mains power X2 > 0;

[0021] S7-b2. Repeat step S6 to continuously drive N energy storage machines to output in sequence until the monitoring unit detects that the detected X is 0; at this time, the corresponding No. N energy storage machine can carry the load, and there is no need for the No. N+1 energy storage machine to carry the load;

[0022] S8. When X < 0, it indicates that the current of the load machine becomes smaller. First, determine which energy storage machine is not outputting at full power, and then control the output current of that energy storage machine to decrease by X or sequentially until the last energy storage machine.

[0023] Furthermore, when the mains power fails and cannot work, it enters the off-grid mode at this time, including the following steps:

[0024] S10. The No. 1 energy storage machine first acts as a voltage source to carry the load, and other energy storage machines act as current sources. The monitoring unit sends the real-time Y of the No. 1 energy storage machine carrying the load to the control module in real time, and the control module then sends a signal to the No. 2 energy storage machine, where Y is the same basic physical quantity as X;

[0025] S11. When the No. 2 energy storage machine is not outputting at full load, drive the No. 2 energy storage machine to output Y through wireless networking;

[0026] S12-a. When the output A2 of the No. 2 energy storage machine at full load power > Y, the No. 2 energy storage machine outputs Y, and at this time the Y2 of the No. 1 energy storage machine = 0;

[0027] S12-b. When the output A2 of the No. 2 energy storage machine at full load power < Y, the No. 2 energy storage machine outputs A2, indicating that the output of the No. 2 energy storage machine is limited, and it is necessary to continue to output the No. 3 energy storage machine to the AC bus to carry the load. Thereafter, the Y2 of the No. 1 energy storage machine > 0;

[0028] S13. The control module drives the No. 3 energy storage machine to output Y2 through wireless networking;

[0029] S14-a. When A3 > Y2, the No. 3 energy storage machine outputs Y2, and thereafter the Y3 of the No. 1 energy storage machine = 0;

[0030] S14-b. When A3 < Y2, the No. 3 energy storage machine outputs A3, and thereafter the Y3 of the No. 1 energy storage machine > 0;

[0031] S15. Sequentially repeat step S13 to continuously drive N energy storage machines to output current until the monitoring unit detects that the detected Yn = 0 or until the last energy storage machine.

[0032] Furthermore, the first online energy storage machine is defaulted to the No. 1 machine.

[0033] Furthermore, the mains effective value is the mains current effective value, and X is the current value, wherein X=mains current effective value*power factor; A represents the current.

[0034] Furthermore, the mains effective value is the mains power effective value, and X is the power value, wherein X=voltage effective value*mains power effective value*power factor; and A represents power.

[0035] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0036] A grid-connected energy storage system and a power supply method based on the grid-connected energy storage system of the present invention use wireless networking to connect multiple energy storage machines to the grid. The control module can wirelessly control the energy storage machines. At the same time, each energy storage machine is a power supply control system that can operate independently, so that users can easily increase or decrease the number of energy storage machines to meet actual usage needs.

[0037] Secondly, when using this power supply method, it is not necessary to know the capacity and power of each energy storage machine. It only needs the energy storage machine to output power according to the set command. In this way, when in use, the charging and discharging currents and battery capacities of various energy storage machines can be different, and they can be from different manufacturers, which greatly facilitates the user's system reuse and expansion and reduces costs. It can flexibly adjust the output power and specify the power output of a certain device in special usage scenarios, solve the needs of various application scenarios of users, reduce product failure rates and costs, and meet actual usage needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0039] Attached Figure 1 It is a structural schematic diagram of a grid-connected energy storage system in one embodiment of the present invention;

[0040] Attached Figure 2 A schematic diagram of a flow chart of an embodiment of the present invention in a grid-connected operation mode;

[0041] Among them: energy storage machine-1, AC bus-2, AC power-3, first load machine-4, second load machine-5, control module-6, automatic protection module-7, monitoring unit-8, current transformer-9, load machine-10. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0044] The present invention provides a grid-connected energy storage system and a power supply method based on the grid-connected energy storage system to solve the problems of high energy consumption and failure rate of the battery stacking technology used in the prior art, as well as complicated and inconvenient operation, low flexibility and reliability.

[0045] For ease of understanding, the specific process in the embodiments of the present application is described below. Figure 1 A stackable energy storage system in an embodiment of the present application includes an energy storage machine 1, an AC bus 2, a mains power 3, a load machine and a control module 6; multiple energy storage machines 1 are connected together through wireless networking communication, and multiple energy storage machines 1 are arranged in parallel on the AC bus 2; the AC bus 2 is connected to the mains power 3; multiple load machines are also connected in parallel to the AC bus 2, and the load machine in this embodiment includes a first load machine 4 and a second load machine 5, which correspond to a high-power load machine and a long-endurance load machine respectively; the energy storage machine 1, the load machine and the mains power 3 are connected to the control module 6 respectively, and the control module 6 can control the energy storage machine 1, the load machine and the mains power 3 accordingly.

[0046] Furthermore, in this embodiment, a wireless networking communication technology is used to achieve seamless connection of multiple energy storage machines 1, intelligent control strategy, and automatic intelligent control of power output, remote monitoring and fault diagnosis. The wireless networking communication technology refers to a network topology structure, which uses multiple relay nodes to expand the wireless signal coverage range and is not limited to (WIFI, Bluetooth, 4G, Zigbee, Z-Wave, LoRa (Long Range), SigFox, satellite communication, UWB (Ultra-Wideband)) and other communication technologies.

[0047] Furthermore, the energy storage machine 1 is connected to the AC bus 2 through a voltage and current dual-loop control module. The voltage and current dual-loop control is an inverter control strategy that simultaneously controls the inverter output current and the mains current to achieve a stable connection between the energy storage machine 1 and the mains 3. The inner loop controls the output current of the energy storage machine 1, and the outer loop controls the mains 2 current. The dual-loop control can achieve accurate matching of the energy storage machine 1 and the mains 2 current.

[0048] Furthermore, the AC bus 2 is also connected to an automatic protection module 8, and the automatic protection module 8 is connected to the control module 6; the automatic protection module 8 can timely identify system abnormalities and take protection measures, such as overvoltage protection, overcurrent protection, short circuit protection and temperature monitoring, to ensure safe operation of the equipment.

[0049] Furthermore, the mains power 3 is also provided with a monitoring unit 7 for monitoring power. The monitoring unit 7 in this embodiment includes a CT transformer or a household electric meter. The power of the mains power 2 is monitored in real time through communication with the assistance of the CT transformer or the household electric meter. When the output of the load machine is greater than the preset threshold of the grid-connected energy storage machine 1, the control module 6 automatically controls the orderly operation of other grid-connected energy storage machines 1 to ensure that the demand of the high-power load machine can be met.

[0050] In addition, the amount of electricity in the energy storage machine 1 can be automatically identified by the control module 6 , so that the corresponding energy storage machine 1 can be automatically turned on or off.

[0051] The energy storage machine 1 is provided with a PV panel therein, and the PV panel is used to connect to the PV inverter, so that when the energy storage machine 1 is discharged, it can be connected to an external power source through the PV inverter for charging.

[0052] At the same time, each of the energy storage machines 1 is provided with a current transformer 9, whose main function is to convert the large current on the primary side into a smaller current suitable for use by an instrument or relay, usually with a rated current of 5A or 1A. In the power grid, the current transformer 9 plays an important role. They are not only used to monitor the operating status of the power grid, but also to achieve protection tripping or other protection actions through microcomputer protection, interlocking, etc. when the motor equipment fails to operate, so as to ensure the safe operation of the power grid.

[0053] Embodiment 1

[0054] based on Figure 1 and Figure 2 The present invention also discloses a power supply method based on an energy storage power supply system. In the power supply method in this embodiment, from left to right, there are energy storage machine No. 1, energy storage machine No. 2, and energy storage machine No. N. The energy storage machine uses wireless MESH networking intelligent control technology. Here, energy storage machine No. 1 is automatically set as the host when it is turned on and online, and other machines are slaves. At the same time, in this embodiment, the current value is used as the basic physical quantity in the circuit, and the current value X = the effective value of the mains current * power factor. In the following, Ia is used to represent X, Ib is used to represent Y, and I is used instead of A for description. In this embodiment, its power supply method includes the following steps:

[0055] S1. If the control module 6 determines that the mains voltage is continuously greater than 80V for a certain period of time, the power supply method of the system enters the grid-connected operation mode;

[0056] S2. When the monitoring unit 8 detects that a high-power load machine is working, the mains power supplies the load first. The monitoring unit sends the measured effective value of the mains power to the control module in real time. Among them, the current value Ia = the effective value of the mains power * power factor;

[0057] S3. The control module drives the No. 1 energy storage machine to output current Ia through wireless networking;

[0058] S4. When the output current I1 of the No. 1 energy storage machine at full load power < Ia, the No. 1 energy storage machine outputs current I1, and then the mains current value Ia1 > 0; when the output current I1 of the No. 1 energy storage machine at full load power > Ia, the No. 1 energy storage machine outputs current Ia, and then the mains current value Ia1 = 0;

[0059] S5. When the control module receives the mains current Ia1 > 0 monitored by the monitoring unit, it indicates that the output of the No. 1 energy storage machine is limited, and it is necessary to continue to output the No. 2 energy storage machine to the AC bus to supply the load;

[0060] S6. The control module drives the No. 2 energy storage machine to output current Ia1 through wireless networking, and the output current of the No. 2 energy storage machine is I2;

[0061] S7-a. When I2 > Ia1, the No. 2 energy storage machine outputs current Ia1, and then the mains current value Ia2 = 0;

[0062] S7-b1. When I2 < Ia1, the No. 2 energy storage machine outputs current I2, and then the mains current value Ia2 > 0;

[0063] S7-b2. Repeat step S6, and drive N energy storage machines to continuously output current in sequence until the mains current value Ia detected by the monitoring unit is 0; at this time, the corresponding No. N energy storage machine can supply the load, and there is no need for the No. N+1 energy storage machine to supply the load;

[0064] S8. When the mains current Ia < 0, it indicates that the current of the load machine becomes smaller. First, determine which energy storage machine is not outputting at full power, and then control the energy storage machine to reduce the output current by Ia or in sequence until the last energy storage machine.

[0065] In summary, in the grid-connected mode, the automatic adjustment of the current output of the energy storage machine can be realized without considering the size of the energy storage machine, and the adaptability is wide.

[0066] Furthermore, when the mains power cannot work, the system enters the off-grid working mode. The specific steps are as follows:

[0067] S10. The No. 1 energy storage machine first acts as a voltage source to supply the load, and other energy storage machines act as current sources. The monitoring unit sends the measured current value Ib of the No. 1 energy storage machine supplying the load to the control module in real time, and the control module then sends a signal to the No. 2 energy storage machine. Among them, Ib = the effective value of the load current * power factor;

[0068] S11. When the No. 2 energy storage machine does not output at full load, drive the output current Ib of the No. 2 energy storage machine through wireless networking;

[0069] S12-a. When the output current I2 of the No. 2 energy storage machine at full load power > Ib, the No. 2 energy storage machine only needs to output the current Ib. At this time, the current value of the No. 1 energy storage machine is Ib2 = 0; specifically, Ib2 at this time represents the current when the No. 1 energy storage machine is loaded as a voltage source. Since the output current I2 of the No. 2 energy storage machine at full load power > Ib, Ib2 = 0 at this time is 0;

[0070] S12-b. When the output current I2 of the No. 2 energy storage machine at full load power < Ib, the No. 2 energy storage machine outputs the current I2, indicating that the output of the No. 2 energy storage machine is limited and the No. 3 energy storage machine needs to continue to output to the AC bus for loading; thereafter, the current value of the No. 1 energy storage machine is Ib2 > 0;

[0071] S13. The control module drives the output current Ib2 of the No. 3 energy storage machine through wireless networking;

[0072] S14-a. When I3 > Ib2, the No. 3 energy storage machine outputs the current Ib2, and thereafter the current value of the No. 1 energy storage machine is Ib3 = 0;

[0073] S14-b1. When I3 < Ib2, the No. 3 energy storage machine outputs the current I3, and thereafter the current value of the No. 1 energy storage machine is Ib3 > 0;

[0074] S14-b2. Sequentially repeat step S13, continuously drive N energy storage machines to output current until the monitoring unit detects Ibn = 0 or until the last energy storage machine.

[0075] In summary, when using this power supply method, it is not necessary to know the capacity and power of each energy storage machine 1. As long as the energy storage machine 1 outputs power according to the set command, the charging and discharging current magnitudes and battery capacities of various energy storage machines can be different during use, and they can be from different manufacturers. This brings great convenience to the system reuse and expansion of users, reduces costs, and well meets the usage requirements.

[0076] In addition, each energy storage machine is relatively independent, and there will be no switching problems, compatibility problems between energy storage machines, connection structures between energy storage machines, etc. that occur in the traditional method. The use is convenient and effective.

[0077] Of course, the above embodiments all use the current value as the basic physical quantity X in the current, where X=RMS current value of the AC power supply*power factor; it is also possible to use the power value as the basic physical quantity X in the current, where X=RMS voltage value*RMS current value of the AC power supply*power factor. The operation steps are the same as the current value and will not be elaborated again; of course, other basic physical quantities are also possible as long as they can adapt to the present power supply method.

[0078] The above are only specific application examples of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A grid-connected energy storage system, characterized in that: It includes several energy storage machines connected by wireless networking communication. A plurality of the energy storage machines are connected in parallel to the AC bus; the AC bus is connected to the commercial power supply; a plurality of load machines are also connected in parallel to the AC bus; the energy storage machines, the load machines, and the commercial power supply are connected to the control module.

2. The grid-connected energy storage system according to claim 1, characterized in that: The wireless networking refers to a network topology structure that extends the wireless signal coverage range through multiple relay nodes; the wireless networking includes WIFI, Bluetooth, 4G, Zigbee, Z-Wave, LoRa, SigFox, satellite communication, UWB.

3. The grid-connected energy storage system according to claim 1, characterized in that: The energy storage machine is connected to the AC bus through a voltage and current double-loop control module.

4. The grid-connected energy storage system according to claim 1, characterized in that: A monitoring unit for monitoring power is also provided on the commercial power supply.

5. The grid-connected energy storage system according to claim 1, characterized in that: A current transformer is correspondingly connected to each of the energy storage machines.

6. A power supply method based on a grid-connected energy storage system, characterized in that: It includes the following steps: S1. If the control module determines that the commercial power supply voltage is continuously greater than 80V within a certain period of time, it enters the grid-connected operation mode; S2. When the monitoring unit monitors that a high-power load machine is working, the commercial power supply first supplies the load. The monitoring unit sends the monitored effective value of the commercial power supply to the control module in real time, and obtains the basic physical quantity X in the circuit according to the effective value of the commercial power supply; S3. The control module then drives the No. 1 energy storage machine to output X through wireless networking; S4. When the output A1 of the No. 1 energy storage machine at full load power < X, the No. 1 energy storage machine outputs A1, and thereafter the effective value of the commercial power supply is X1 > 0; when the output A1 of the No. 1 energy storage machine at full load power > X, the No. 1 energy storage machine outputs X, and thereafter the effective value of the commercial power supply X1 = 0; S5. When the control module receives the effective value X1 of the commercial power supply monitored by the monitoring unit > 0, it means that the output of the No. 1 energy storage machine is limited, and it is necessary to continue to output the No. 2 energy storage machine to the AC bus to supply the load; S6. The control module drives the No. 2 energy storage machine to output X1 through wireless networking, and the output of the No. 2 energy storage machine is A2; S7-a. When A2 > X1, the No. 2 energy storage machine outputs X1, and thereafter the effective value of the commercial power supply X2 = 0; S7-b1. When A2 < X1, the No. 2 energy storage machine outputs A2, and thereafter the effective value of the commercial power supply X2 > 0; S7-b2. Repeat step S6, continuously drive N energy storage machines to output in sequence until the detected X monitored by the monitoring unit is 0; at this time, the corresponding No. N energy storage machine can supply the load, and there is no need for the No. N+1 energy storage machine to supply the load; S8. When X < 0, it means that the current of the load machine becomes smaller. First, judge which energy storage machine does not output at full power, and then control the output current of the energy storage machine to decrease by X or sequentially until the last energy storage machine.

7. The power supply method based on the grid-connected energy storage system according to claim 6, characterized in that: When the commercial power supply fails and cannot work, it enters the off-grid mode at this time, including the following steps: S10. The No. 1 energy storage machine first acts as a voltage source to supply the load, and other energy storage machines act as current sources. The monitoring unit sends the monitored Y of the No. 1 energy storage machine supplying the load to the control module in real time, and the control module then sends a signal to the No. 2 energy storage machine, where Y is the same basic physical quantity as X; S11. When the No. 2 energy storage machine does not output at full load, drive the No. 2 energy storage machine to output Y through wireless networking; S12-a. When the output A2 of the No. 2 energy storage machine at full load power > Y, the No. 2 energy storage machine can output Y, and at this time the Y2 of the No. 1 energy storage machine = 0; S12-b. When the output A2 of the No. 2 energy storage machine at full load power is less than Y, the No. 2 energy storage machine outputs A2, indicating that the output of the No. 2 energy storage machine is limited. It is necessary to continue to output the No. 3 energy storage machine to the AC bus to carry the load. After that, Y2 of the No. 1 energy storage machine is greater than 0; S13. The control module drives the output of the No. 3 energy storage machine Y2 through wireless networking; S14-a. When A3 > Y2, the No. 3 energy storage machine outputs Y2. After that, Y3 of the No. 1 energy storage machine is 0; S14-b. When A3 < Y2, the No. 3 energy storage machine outputs A3. After that, Y3 of the No. 1 energy storage machine is greater than 0; S15. Sequentially repeat step S13 to continuously drive N energy storage machines to output current until the monitoring unit detects that the detected Yn = 0 or until the last energy storage machine.

8. The power supply method based on the grid-connected energy storage system according to claim 6 or 7, characterized in that: The first online energy storage machine is defaulted to the No. 1 machine.

9. The power supply method based on the grid-connected energy storage system according to claim 7, wherein: The effective value of the commercial power is the effective value of the commercial power current, and X is the current value, where X = the effective value of the commercial power current * power factor; A represents the current.

10. The power supply method based on the grid-connected energy storage system according to claim 7, characterized in that: The effective value of the commercial power is the effective value of the commercial power, and X is the power value, where X = the effective value of the voltage * the effective value of the commercial power * power factor; A represents the power.

Images