Power management method and power management system

Abstract

The present application provides a power management method and a power management system, which can reduce cost and effectively manage and apply various power supplies. The power management method comprises the following steps. A sensing circuit senses current information on a bus bar of a power distribution panel. The power distribution panel is coupled with a load, a power grid, an energy storage device or a renewable energy device through the bus bar. A processor calculates bus bar power of the power distribution panel according to the current information. The processor adjusts power settings of the energy storage device or the renewable energy device according to the charge and discharge state of the energy storage device based on the bus bar specification and the bus bar power of the power distribution panel.

Description

Technical Field

[0001] This invention relates to a power management method, and more particularly to a power management method and power management system applied to a distribution panel. Background Technology

[0002] For environmental sustainability, renewable energy and energy storage can be integrated with power systems. Specifically, a power system can, for example, manage various power sources from the grid, renewable energy, and energy storage simultaneously through a newly installed switchboard. Alternatively, a power system can, for example, be equipped with additional power interfaces for renewable energy and energy storage within an existing switchboard.

[0003] However, due to the increased power capacity used in switchboards, the required bus capacity of the switchboards also needs to be increased accordingly to prevent them from operating beyond their specifications. Thus, whenever the power used by renewable energy, energy storage, and loads increases, the current power system must again and correspondingly increase the bus capacity, thereby increasing the cost of the power system and reducing the efficiency of power system management. Summary of the Invention

[0004] This invention provides a power management method that can effectively manage and utilize various power sources such as renewable energy and energy storage without changing the bus capacity, while ensuring that the switchboard operates within specifications.

[0005] The power management method of this invention includes the following steps: Sensing current information on the busbar of a distribution panel via a sensing circuit. The distribution panel is coupled to at least one load, power grid, energy storage device, or renewable energy device via the busbar. A processor calculates the busbar power of the distribution panel based on the current information. The processor adjusts the power setting of the energy storage device or the power setting of the renewable energy device according to the charging and discharging state of the energy storage device, based on the busbar specifications and power of the distribution panel.

[0006] This invention also provides a power management system. The power management system includes a distribution panel, a sensing circuit, and a processor. The distribution panel includes a bus. The distribution panel bus is coupled to at least one load, a power grid, an energy storage device, or a renewable energy device. The sensing circuit is coupled to the distribution panel. The sensing circuit is used to sense current information on the bus. The processor is coupled to the distribution panel, the sensing circuit, the energy storage device, and the renewable energy device. The processor is used to calculate the bus power of the distribution panel based on the current information. The processor is also used to adjust the power setting of the energy storage device or the power setting of the renewable energy device based on the bus specifications and bus power of the distribution panel, according to the charging and discharging state of the energy storage device.

[0007] Based on the above, the power management method and power management system of this invention, through a processor based on bus specifications and calculated bus power, adjust the power settings of the energy storage device or renewable energy device according to the operating state of the energy storage device (i.e., charging state, discharging state, or other states). This adaptively adjusts the power applied by the power management system to prevent the distribution panel from operating beyond the bus specifications. Thus, the power management system does not need to replace the bus with one having a larger capacity to meet the power capacity requirements of the distribution panel, thereby reducing the cost of the power management system and effectively managing and utilizing various power sources such as renewable energy and energy storage.

[0008] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a circuit block diagram of a power management system according to an embodiment of the present invention.

[0010] Figure 2 This is a flowchart illustrating a power management method according to an embodiment of the present invention.

[0011] Figure 3 This is a circuit block diagram of a power management system according to another embodiment of the present invention.

[0012] Figure 4 It is based on the present invention Figure 3 A flowchart illustrating the power management method in the embodiments.

[0013] Figures 5A to 5C It is based on the present invention Figure 3 The embodiment illustrates the application diagram of the power management system.

[0014] Figures 6A to 6C It is based on the present invention Figure 3 The embodiment illustrates the application diagram of the power management system.

[0015] [List of Labels in the Attached Image]

[0016] 100, 300: Power Management System

[0017] 110, 310: Distribution panel

[0018] 111, 311: Busbar

[0019] 120, 320: Sensing circuit

[0020] 130, 330: Processors

[0021] 321~323: Specific flow meter

[0022] 330a: Energy Management System (EMS)

[0023] 341~345: Circuit Breaker

[0024] DI: Current Information

[0025] I1: First current

[0026] I2: Second current

[0027] I3: Third Current

[0028] LD1~LD2, LD: Load

[0029] PT1~PT2: Interval

[0030] PW1: Power Grid

[0031] PW2: Energy storage device

[0032] PW3: Renewable Energy Device

[0033] S210~S230, S410~S454: Steps

[0034] t1~t3: Time Detailed Implementation

[0035] Some embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Component symbols used in the following description, when appearing in different drawings, are considered to be the same or similar components. These embodiments are only a part of the present invention and do not disclose all possible implementations of the invention. More precisely, these embodiments are merely examples in the claims of the present invention.

[0036] Figure 1 This is a circuit block diagram of a power management system according to an embodiment of the present invention. (Reference) Figure 1 The power management system 100 can combine renewable energy and energy storage in existing power distribution environments. The power management system 100 can achieve environmental sustainability through the cyclical charging and discharging of various power sources, while also balancing electricity price differences at different times. Furthermore, the power management system 100 can operate within bus specifications and avoid replacing busbars to meet the power demands of its operation, thereby reducing costs and effectively managing various power sources.

[0037] The power management system 100 includes a distribution panel 110, a sensing circuit 120, and a processor 130. The distribution panel 110 includes a bus 111. The distribution panel 110 is coupled to a mains grid PW1, an energy storage device PW2, or a renewable energy device PW3 via the bus 111. The mains grid PW1 is used to discharge to provide mains power to the bus 111. The energy storage device PW2 is used to charge to store electrical energy and can be used as a load. The energy storage device PW2 is also used to discharge to release the stored electrical energy to the bus 111 and can be used as a power source. The renewable energy device PW3 is used to discharge to provide renewable energy to the bus 111. The distribution panel 110 can also be coupled to one or more loads (e.g., loads LD1~LD2) via the bus 111 based on usage requirements.

[0038] The sensing circuit 120 is coupled to the distribution panel 110 and the processor 130. The sensing circuit 120 may be implemented, for example, by one or more current sensing elements. The sensing circuit 120 may be located in the distribution panel 110.

[0039] Processor 130 is coupled to switchboard 110 and sensing circuit 120, and is also coupled to energy storage device PW2 and renewable energy device PW3. Processor 130 may be, for example, a server, signal converter, field programmable gate array (FPGA), central processing unit (CPU), or other programmable general-purpose or special-purpose microprocessor, digital signal processor (DSP), programmable controller, application-specific integrated circuit (ASIC), programmable logic device (PLD), or other similar device or combination of these devices, which can load and execute computer programs, firmware or software to perform setting, control and various calculation functions.

[0040] Figure 2 This is a flowchart illustrating a power management method according to an embodiment of the present invention. (See reference) Figure 1 as well as Figure 2 The power management system 100 can implement the power management method by executing steps S210 to S230. The order of these steps S210 to S230 is only for illustrative purposes and is not limited thereto.

[0041] In step S210, the sensing circuit 120 senses the current information DI on the bus 111 and outputs the current information DI to the processor 130. The current information DI indicates the total current of the various power sources (including mains power, energy storage, and renewable energy) used by the bus 111.

[0042] In step S220, the processor 130 calculates the bus power of the distribution panel 110 based on the current information DI. That is, the processor 130 converts the various power sources used by the bus 111 into a total power and expresses it as bus power. Bus power indicates the total electrical energy of the various power sources (including mains power, energy storage, and renewable energy) used by the bus 111. The total electrical energy includes the sum of the electrical energy provided by the grid PW1, the electrical energy provided or consumed by the energy storage device PW2, and the electrical energy provided by the renewable energy device PW3.

[0043] In step S230, the processor 130, based on the bus specifications of the distribution panel 110 and the bus power calculated in step S220, adjusts the power setting of the energy storage device PW2 or the power setting of the renewable energy device PW3 according to the charging and discharging state of the energy storage device PW2. The bus specifications indicate the current, voltage, and / or power of the total power supply that the bus 111 can carry.

[0044] In other words, considering whether the total electrical energy used by bus 111 meets the bus specifications, processor 130 adjusts the power setting of energy storage device PW2 or renewable energy device PW3 according to the working state of energy storage device PW2 (i.e., charging state used as a load, discharging state used as a power source, or other states) so that the total electrical energy meets the bus specifications.

[0045] It is worth mentioning that by adjusting the energy storage or renewable energy used by the power management system 100 according to the current charge / discharge state of the energy storage device PW2, the power management system 100 can adaptively adjust (e.g., reduce) the total electrical energy used by the bus 111. Thus, in order for the bus 111 to operate within its specifications, the power management system 100 does not need to replace the existing bus 111 with another bus having a larger capacity. Therefore, the power management system 100 can reduce the required costs and also effectively manage and utilize the energy storage device PW2 and the renewable energy device PW3.

[0046] Figure 3 This is a circuit block diagram of a power management system according to another embodiment of the present invention. (Reference) Figure 3The power management system 300 includes a distribution panel 310, a sensing circuit 320, and a processor 330, wherein the distribution panel 310 includes a bus 311. The distribution panel 310, bus 311, sensing circuit 320, and processor 330 can be deduced from the relevant description of the power management system 100.

[0047] exist Figure 3 In this embodiment, the sensing circuit 320 includes a first current transformer (CT) 321 (hereinafter referred to as current transformer 321), a second current transformer 322 (hereinafter referred to as current transformer 322), and a third current transformer 323 (hereinafter referred to as current transformer 323). Current transformer 321 is coupled to the power grid PW1 and also coupled to bus 311 and processor 330. Current transformer 321 is used to sense a first current I1 flowing through a first power distribution path. The first power distribution path may be, for example, a current path flowing through the power grid PW1 in the distribution panel 310.

[0048] Current comparator 322 is coupled to energy storage device PW2 and also to processor 330. Current comparator 322 is used to sense a second current I2 flowing through a second power distribution path. The second power distribution path may be, for example, a current path flowing through energy storage device PW2 in distribution panel 310. Current comparator 323 is coupled to renewable energy device PW3 and also to processor 330. Current comparator 323 is used to sense a third current I3 flowing through a third power distribution path. The third power distribution path may be, for example, a current path flowing through renewable energy device PW3 in distribution panel 310.

[0049] exist Figure 3 In this embodiment, the power management system 300 further includes an energy management system (EMS) 330a. The EMS 330a includes a processor 330 and is coupled to a switchboard 310, current transformers 321-323, an energy storage device PW2, and a renewable energy device PW3. The EMS 330a is used to monitor and manage the various electrical energy sources used by the power management system 300 via the processor 330.

[0050] In addition, the power management system 300 includes a first circuit breaker 341 (hereinafter referred to as circuit breaker 341), a second circuit breaker 342 (hereinafter referred to as circuit breaker 342), and a third circuit breaker 343 (hereinafter referred to as circuit breaker 343). Circuit breaker 341 is coupled to the power grid PW1 and is also coupled to the current transformer 321 and the busbar 311. Circuit breaker 341 can serve as the main circuit breaker on the first distribution path flowing through the power grid PW1. Circuit breaker 341 is used to automatically disconnect the distribution path to provide protection when a current overload or other electrical problem (including short circuit and leakage) occurs in the first distribution path.

[0051] Similarly, circuit breaker 342 is coupled to energy storage device PW2 and also to current transformer 322. Circuit breaker 342 can serve as a circuit breaker on a second power distribution path flowing through energy storage device PW2, and protect the second power distribution path and energy storage device PW2 (including overload protection). Circuit breaker 343 is coupled to regenerative energy device PW3 and also to current transformer 323. Circuit breaker 343 can serve as a circuit breaker on a third power distribution path flowing through regenerative energy device PW3, and protect the third power distribution path and regenerative energy device PW3 (including overload protection).

[0052] Based on design requirements, the power management system 300 also includes one or more other circuit breakers (e.g., circuit breakers 344-345). Circuit breaker 344 is coupled to load LD2 and serves as a loop circuit breaker on the power distribution path passing through load LD2 to provide protection. The description of circuit breaker 345 can be referenced from that of circuit breaker 344 and deduced similarly.

[0053] Figure 4 It is based on the present invention Figure 3 A flowchart illustrating the power management method in the embodiments. (See reference...) Figure 3 as well as Figure 4 The power management system 300 can implement the power management method by executing steps S410 to S454. The order of these steps S410 to S454 is only for illustrative purposes and is not limited thereto.

[0054] In step S410, EMS 330a accesses information about the distribution panel 310 via processor 330 and sets the bus specifications of the distribution panel 310 based on the information. The bus specifications indicate the total power (including mains power, energy storage, and renewable energy) that the bus 311 is allowed to carry.

[0055] In step S420, EMS 330a accesses the current information DI sensed by the sensing circuit 320 through the processor 330, and calculates the bus power of the distribution panel 110 based on the current information DI.

[0056] Specifically, sensing circuit 320 senses a first current I1 flowing through the first power distribution path of grid PW1 via current comparator 321. The first current I1 includes the magnitude and direction of the current in the first power distribution path and indicates the supply current of grid PW1. Sensing circuit 320 senses a second current I2 flowing through the second power distribution path of energy storage device PW2 via current comparator 322. The second current I2 includes the magnitude and direction of the current in the second power distribution path and indicates the operating current (i.e., supply current, or consumption current) of energy storage device PW2. Sensing circuit 320 senses a third current I3 flowing through the third power distribution path of renewable energy device PW3 via current comparator 323. The third current I3 includes the magnitude and direction of the current in the third power distribution path and indicates the supply current of renewable energy device PW3. Current comparators 321-323 output currents I1-I3 to processor 330 as current information DI. In other words, the current information DI includes the supply current of the grid PW1, the supply current or power consumption current of the energy storage device PW2, and the supply current of the renewable energy device PW3, thereby indicating the total current of the total power supply (including mains power, energy storage and renewable energy) carried by the current bus 311.

[0057] Next, the processor 330 performs a summation calculation based on the first current I1, the second current I2, and the third current I3, and generates the bus power based on the total current using known electrical formulas. In other words, the processor 330 sums the power supplied by the grid PW1, the power supplied or consumed by the energy storage device PW2, and the power supplied by the renewable energy device PW3 to obtain the total power used by the current bus 311.

[0058] In step S430, EMS 330a determines whether the bus power exceeds the bus specifications through processor 330. When the determination is yes, it indicates that the current bus 311 is operating outside the bus specifications. That is, in step S430, processor 330 determines that the bus power exceeds the bus specifications. In order to correct the operating state of bus 311, processor 330 proceeds to steps S441-S446 to reduce at least one of the power limit settings of energy storage device PW2 and renewable energy device PW3, so that bus 311 operates within the bus specifications.

[0059] Specifically, in step S441, when the bus power exceeds the bus specifications, the processor 330 can determine the charging / discharging state of the energy storage device PW2, for example, based on the second current I2 sensed by the current transformer 322. The charging / discharging state can be, for example, a discharging state where the energy storage device PW2 is used as a power source, or, for example, a charging state where the energy storage device PW2 is used as a load. Thus, the processor 330 adjusts the power setting of the energy storage device PW2 based on whether it is in a charging or discharging state, for example, by lowering the upper limit setting of the power of the energy storage device PW2.

[0060] Specifically, in step S442, the processor 330 determines that the energy storage device PW2 is in a discharge state, and adjusts the upper limit of the discharge power of the energy storage device PW2 according to the determination result (i.e., the discharge state). In this way, the energy storage device PW2, used as a power source, will reduce the power supplied to the distribution panel 311, thereby reducing the bus power and correcting the operating state that exceeds the bus specifications.

[0061] In step S443, the processor 330 determines that the energy storage device PW2 is in a charging state, and adjusts the upper limit of the charging power of the energy storage device PW2 according to the determination result (i.e., the charging state). In this way, the energy storage device PW2, used as a load, will reduce the power consumption of the distribution panel 311, thereby reducing the bus power and correcting the operating state that exceeds the bus specifications.

[0062] Furthermore, the charging and discharging state of the energy storage device PW2 can also be other states, such as stopping charging and simultaneously stopping discharging. In this case, the processor 330 adjusts the power setting of the regenerative energy device PW3 based on the charging and discharging state of the energy storage device PW2 being neither a charging state nor a discharging state, for example, by lowering the upper limit setting of the power of the regenerative energy device PW3.

[0063] Specifically, in step S444, when the bus power exceeds the bus specification, and when the energy storage device PW2 is neither in a charging state nor a discharging state, the processor 330 determines whether the regenerative energy device PW3 is discharging. If the determination is yes, it means that while the bus power exceeds the bus specification, the energy storage device PW2 stops discharging and charging, and the regenerative energy device PW3 provides regenerative energy to the bus 311. The processor 330 continues to step S445. If the determination is no, it means that while the bus power exceeds the bus specification, both the energy storage device PW2 and the regenerative energy device PW3 stop operating. The processor 330 continues to step S446.

[0064] In step S445, the processor 330 lowers the upper limit of the discharge power of the regenerative energy device PW3. Thus, the regenerative energy device PW3, used as a power source, reduces the amount of power supplied to the distribution panel 311, thereby reducing the bus power. Therefore, even when the energy storage device PW2 cannot be configured, the processor 330 can still correct operating conditions exceeding bus specifications by configuring the regenerative energy device PW3.

[0065] In step S446, processor 330 outputs a warning message to circuit breaker 341 operating beyond specifications. The warning message indicates that the bus power exceeds the bus specifications and the problem cannot be resolved by adjusting (e.g., reducing) the bus power. In response to the warning message, circuit breaker 341 disconnects the first distribution path flowing through the power grid PW1 according to its own specifications, thereby forcing the protection function to be implemented.

[0066] On the other hand, if the determination in step S430 is negative, it means that the current bus 311 is not operating beyond the bus specifications. That is, if the processor 330 determines in step S430 that the bus power is not exceeding the bus specifications, in order to restore the correction settings made in steps S441 to S446, the processor 330 restores at least one of the power limit settings of the energy storage device PW2 and the power limit settings of the renewable energy device PW3 by continuing through steps S451 to S454.

[0067] Specifically, in step S451, when the bus power does not exceed the bus specifications, the processor 330 determines whether the power limit setting (i.e., the discharge power limit value) of the regenerative energy device PW3, which was reduced in step S445, has reached a preset maximum value. The preset maximum value indicates the maximum adjustable output power of the regenerative energy device PW3. If the determination is negative, it indicates that the power limit setting of the reduced regenerative energy device PW3 still has room for adjustment, meaning that the output power of the regenerative energy device PW3 has not reached its maximum value. Next, in step S453, the processor 310 increases the power limit setting of the regenerative energy device PW3, thereby increasing the electrical energy supplied by the regenerative energy device PW3 to the distribution panel 311. The processor 310 re-executes step S420. On the other hand, if the determination is positive, it indicates that the power limit setting of the reduced regenerative energy device PW3, which was reduced in step S445, has reached the preset maximum value and there is no room for adjustment. The processor 310 continues to step S452.

[0068] In step S452, the processor 310 determines whether the power limit setting (including the discharge power limit value and the discharge power limit value) of the energy storage device PW2, which was lowered in steps S442-S443, has reached a preset maximum value. The preset maximum value indicates the maximum adjustable output power of the energy storage device PW2. If the determination is negative, it indicates that the power limit setting of the lowered energy storage device PW2 still has room for adjustment, that is, the output power of the energy storage device PW2 has not reached the maximum value. Next, in step S454, the processor 310 raises the power limit setting of the energy storage device PW2, thereby increasing the power supplied by the energy storage device PW2 to the distribution panel 311, or increasing the power consumed by the energy storage device PW2 from the distribution panel 311. The processor 310 then re-executes step S420.

[0069] Figures 5A to 5C It is based on the present invention Figure 3 A schematic diagram illustrating the application of the power management system in the embodiment. (Reference) Figure 3 as well as Figures 5A to 5C Taking the average electricity consumption habits outside of summer months as an example, the power management system 300 example illustrates how to adaptively adjust the bus power of bus 311. Figure 5A In this context, the power management system 300 may operate, for example, in the interval PT1. Interval PT1 is the peak period of ionization, and for example, from 11:00 to 14:00.

[0070] exist Figure 5B In section PT1, the electrical energy of distribution panel 310 mainly comes from the power grid PW1 and the renewable energy device PW3. Devices consuming this electrical energy include the load LD used by distribution panel 310 and the energy storage device PW2. The energy storage device PW2 is charged based on the electrical energy of distribution panel 310 for use as a load.

[0071] exist Figure 5C In the diagram, the horizontal axis represents the operating time of the power management system 300 in interval PT1, and the vertical axis represents the power operated by the power management system 300 in interval PT1. The bus specification may indicate, for example, the total power (including mains power, energy storage, and renewable energy) that the bus 311 is allowed to carry, such as 100 watts (W).

[0072] In this embodiment, the bus power calculated by the processor 330 includes the power supplied by the power grid PW1 and the renewable energy device PW3, and also includes the power consumed by the energy storage device PW2. The power consumed by the bus 311 includes the power consumed by the load LD and the power consumed by the energy storage device PW2.

[0073] At time t1, when the bus power exceeds the bus specification, the power consumption of bus 311 also exceeds the bus specification. At this time, as... Figure 4 As shown in steps S441-S442, processor 330 determines that the charging / discharging state of energy storage device PW2 is a charging state. Processor 330 reduces the bus power by lowering the upper limit of the charging power of energy storage device PW2, thereby reducing the power consumption of bus 311 and reducing the power supply power of grid PW1.

[0074] At time t2, when the bus power does not exceed the bus specification, the power consumption of bus 311 also does not exceed the bus specification. At this time, as... Figure 4 As shown in steps S451 to S454, since the power limit setting (i.e., the discharge power limit value) of the regenerative energy device PW3 has not been reduced, the processor 310 restores the reduced bus power by increasing the power limit setting of the regenerative energy device PW3.

[0075] It should be noted that, in order to increase the reduced bus power, the processor 310 prioritizes the use of electrical energy provided by the regenerative energy device PW3 and also reduces the use of electrical energy provided by the grid PW1. Thus, the power consumption of the bus 311 can be reduced accordingly, and the electrical energy provided by the grid PW1 can also be reduced accordingly.

[0076] At time t3, when the bus power does not exceed the bus specifications, the power consumption of bus 311 also does not exceed the bus specifications. At this time, in order to adjust the power consumption of bus 311 to be the same as the bus specifications, processor 310 adjusts the bus power by increasing the power limit setting of energy storage device PW2 (i.e., the charging power limit value).

[0077] Figures 6A to 6C It is based on the present invention Figure 3 A schematic diagram illustrating the application of the power management system in the embodiment. (Reference) Figure 3 as well as Figures 6A to 6C Taking the average electricity consumption habits in summer as an example, the power management system 300 illustrates how it adaptively adjusts the bus power of bus 311. Figure 6A In this context, the power management system 300 may operate, for example, in the period PT2. Period PT2 is the peak electricity consumption period, and for example, from 16:00 to 22:00.

[0078] exist Figure 6B In section PT2, the electrical energy of distribution panel 310 mainly comes from the power grid PW1, energy storage device PW2, and renewable energy device PW3. Devices consuming this electrical energy include the load LD used by distribution panel 310. Energy storage device PW2 provides stored energy to distribution panel 310 for use as a power source.

[0079] exist Figure 6CIn the diagram, the horizontal axis represents the operating time of the power management system 300 in interval PT2, and the vertical axis represents the power operated by the power management system 300 in interval PT2. Compared to Figure 5C ,exist Figure 6C In this embodiment, the bus power calculated by the processor 330 includes the power supplied by the power grid PW1, the energy storage device PW2, and the renewable energy device PW3. The power consumption of the bus 311 includes the power consumption of the load LD.

[0080] At time t1, when the bus power exceeds the bus specification, the power consumption of bus 311 also exceeds the bus specification. At this time, as... Figure 4 As shown in steps S441-S442, processor 330 determines that the charging / discharging state of energy storage device PW2 is a charging / discharging state. Processor 330 reduces bus power by lowering the upper limit of the discharge power of energy storage device PW2.

[0081] In this embodiment, it is assumed that the upper limit of the discharge power of the energy storage device PW2 has been reduced multiple times between time t1 and t2, and thus at time t2, it is in a state that is neither charging nor discharging. At this time, the bus power still exceeds the bus specifications, and the power consumed by the bus 311 also still exceeds the bus specifications.

[0082] At time t2, when the bus power exceeds the bus specification, and simultaneously when the energy storage device PW2 is neither in a charging state nor a discharging state, assume that the regenerative energy device PW3 stops discharging. At this time, if... Figure 4 As shown in steps S441-S446, the electrical energy consumed by the load LD comes entirely from the power grid PW1. The processor 330 outputs a warning message, and based on the warning message, alerts the circuit breaker 341 that it has exceeded its operating specifications and will take protective measures. Based on the warning message, the circuit breaker 341 takes protective measures according to the tripping condition reached by the first power distribution path flowing through the power grid PW1.

[0083] In summary, the power management method and power management system of this invention manage various electrical resources of existing distribution panels by configuring an EMS (including a processor). This ensures that the distribution panels do not operate beyond bus specifications and avoids the need to replace the buses to accommodate the power capacity required by the distribution panels. Based on the operating state of the energy storage device (i.e., charging state, discharging state, or non-operating state), the processor can adaptively adjust the power applied by the power management system, thereby effectively managing and utilizing various power sources such as renewable energy and energy storage, and reducing costs.

[0084] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes and modifications without departing from the concept and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A power management method, comprising: A sensing circuit is used to sense the current information on a busbar of a distribution panel, wherein the distribution panel is coupled to at least one load, a power grid, an energy storage device, or a renewable energy device through the busbar. A processor calculates the power of a busbar in the distribution panel based on the current information. as well as The processor adjusts the power setting of the energy storage device or the power setting of the renewable energy device according to the charging and discharging state of the energy storage device, based on the bus specifications and power of the distribution panel.

2. The power management method as described in claim 1, further comprising: The processor determines that the bus power exceeds the bus specification and adjusts at least one of the power limit setting of the energy storage device and the power limit setting of the renewable energy device.

3. The power management method as described in claim 1, further comprising: The processor determines that the bus power does not exceed the bus specification, thereby restoring at least one of the power limit settings of the energy storage device and the power limit settings of the renewable energy device.

4. The power management method as described in claim 1, wherein when the bus power exceeds the bus specification, the power management method includes: The processor adjusts the power setting of the energy storage device based on whether the energy storage device is in a charging state or a discharging state. as well as The processor adjusts the power setting of the renewable energy device based on whether the energy storage device is in a charging state or a discharging state.

5. The power management method as described in claim 4, wherein when the bus power exceeds the bus specification, the power management method includes: The processor determines the charging / discharging state of the energy storage device as the charging state, and then lowers the upper limit of the charging power of the energy storage device.

6. The power management method of claim 4, wherein when the bus power exceeds the bus specification, the power management method includes: The processor determines the charging / discharging state of the energy storage device as the discharging state, and then adjusts the upper limit of the discharge power of the energy storage device.

7. The power management method of claim 4, wherein when the bus power exceeds the bus specification, the power management method includes: The processor determines that the energy storage device is neither in the charging state nor in the discharging state, and determines that the regenerative energy device is discharging, thereby reducing the upper limit of the discharge power of the regenerative energy device.

8. The power management method of claim 7, wherein when the bus power exceeds the bus specification, the power management method includes: The processor determines that the energy storage device is neither in the charging state nor in the discharging state, and determines that the renewable energy device stops discharging. It then outputs a warning message to a first circuit breaker in the distribution panel that is operating beyond its specifications. The first circuit breaker is coupled to the bus and the power grid.

9. The power management method of claim 1, wherein the step of sensing the current information on the busbar of the distribution panel through the sensing circuit includes: A first current flowing through a first distribution path of the power grid is sensed by a first current transformer in the sensing circuit. A second current flowing through a second power distribution path of the energy storage device is sensed by a second current transformer in the sensing circuit. as well as A third current is sensed through a third current transformer in the sensing circuit, which is used to sense a third current flowing through a third power distribution path of the renewable energy device.

10. The power management method of claim 9, wherein the step of calculating the bus power of the distribution panel based on the current information by the processor includes: The processor performs a summation calculation based on the first current, the second current, and the third current to generate the bus power.

11. A power management system, comprising: A switchboard includes a bus and is coupled to at least one load, a power grid, an energy storage device, or a renewable energy device via the bus. A sensing circuit, coupled to the distribution panel, is used to sense the current information on the busbar; as well as A processor, coupled to the distribution panel, the sensing circuit, the energy storage device, and the renewable energy device, is used to: Based on this current information, calculate the power of one busbar of the distribution panel; as well as Based on the bus specifications and power of the distribution panel, the power setting of the energy storage device or the power setting of the renewable energy device can be adjusted according to the charging and discharging state of the energy storage device.

12. The power management system of claim 11, wherein the sensing circuit comprises: A first current comparator, coupled to the power grid, the bus, and the processor, is used to sense a first current flowing through a first distribution path of the power grid; A second current transformer, coupled to the energy storage device and the processor, is used to sense a second current flowing through a second power distribution path of the energy storage device; as well as A third current transducer, coupled to the regenerative energy device and the processor, is used to sense a third current flowing through a third power distribution path of the regenerative energy device.

13. The power management system of claim 12, further comprising: A first circuit breaker, coupled to the power grid and the first current transformer; A second circuit breaker is coupled to the energy storage device and the second current converter; as well as A third circuit breaker is coupled to the regenerative energy device and the third current transformer.

Images