Energy scheduling method and device, direct current elevator, storage medium and electronic equipment

Abstract

The invention discloses an energy scheduling method and device, a direct current elevator, a storage medium and electronic equipment. The energy scheduling method is applied to the direct-current elevator, the direct-current elevator comprises a photovoltaic power generation device, an energy storage device, an energy storage converter, a traction machine and a grid-connected converter, and the energy scheduling method comprises the steps that the working state of the traction machine is judged; wherein the working state comprises a power utilization state and a power generation state; and performing energy scheduling on a power grid, the photovoltaic power generation device and the energy storage device according to the working state of the traction machine, the power generation power of the photovoltaic power generation device and the residual electric quantity of the energy storage device, so that the residual electric quantity of the energy storage device is between a preset electric quantity upper limit and a preset electric quantity lower limit. According to the invention, the problems that the electric quantity of the energy storage device is too high or too low and the electric energy supply and the electric energy consumption of the direct current elevator cannot be ensured at any time can be avoided, and the operation reliability and the safety of the direct current elevator are improved.

Description

Technical Field

[0001] The present invention relates to the field of electronic power technology, and in particular to an energy scheduling method, device, direct current elevator, storage medium and electronic equipment. Background Art

[0002] Elevator equipment (such as DC elevators) has become one of the special equipment frequently used in people's daily life and work. While elevator equipment brings convenience to people's lives, it also consumes a lot of energy. Elevators will generate a lot of feedback energy during operation. At present, the main research direction of elevator energy-saving technology is elevator feedback energy utilization technology. Energy-saving technology that effectively utilizes feedback energy has great development prospects.

[0003] In the existing elevator energy recovery technology, energy storage devices (such as batteries) are usually used to recover and store the energy generated by the elevator traction machine. When the traction machine uses electricity, the energy storage device releases the electricity for the operation of the traction machine. However, when the power grid is off or there is a disaster such as a fire, the elevator can only rely on the electricity stored in the energy storage device to maintain operation. If the energy stored in the energy storage device is insufficient at this time, the elevator will stop operating, posing a threat to the safety of the users. In addition, when the traction machine generates electricity, if the energy storage device is fully charged, it cannot absorb the electricity generated by the traction machine, which will cause this part of the electricity to be fed into the grid. When the power grid is off or abnormal, this part of the electricity cannot be absorbed, which will also cause abnormal operation of the elevator.

[0004] With regard to the problem in the prior art that the power of the energy storage device in the DC elevator is too high or too low, and the power supply and power consumption of the DC elevator cannot be guaranteed at all times, no effective solution has been proposed yet. Summary of the invention

[0005] An energy scheduling method, device, DC elevator, storage medium and electronic device are provided in the embodiments of the present invention to solve the problem in the prior art that the power of the energy storage device in the DC elevator is too high or too low, and the power supply and power consumption of the DC elevator cannot be guaranteed at all times.

[0006] In order to solve the above technical problems, the present invention provides an energy scheduling method, which is applied to a DC elevator. The DC elevator includes a photovoltaic power generation device, an energy storage device, an energy storage converter, a traction machine, and a grid-connected converter. The energy scheduling method includes:

[0007] Determining the working state of the traction machine; wherein the working state includes a power consumption state and a power generation state;

[0008] The power grid, the photovoltaic power generation device and the energy storage device are energy-scheduled according to the working state of the traction machine, the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, so that the remaining power of the energy storage device is between a preset upper power limit and a preset lower power limit.

[0009] Further, judging the working state of the traction machine includes:

[0010] Determining whether the current value on the AC side of the grid-connected converter is positive or negative;

[0011] If the current value of the AC side of the grid-connected converter is negative, it is determined that the working state of the traction machine is a power generation state;

[0012] If the current value of the AC side of the grid-connected converter is positive, it is determined that the working state of the traction machine is a power consumption state.

[0013] Furthermore, according to the working state of the traction machine, the power generation power of the photovoltaic power generation device, and the remaining power of the energy storage device, energy scheduling is performed on the power grid, the photovoltaic power generation device, and the energy storage device, so that the remaining power of the energy storage device is between a preset upper power limit and a preset lower power limit, including:

[0014] If the working state of the traction machine is the power generation state, the grid-connected converter is controlled to switch to the grid-connected power generation state, and then the energy storage device and the grid-connected converter are energy-scheduled based on the remaining power of the energy storage device and the DC bus voltage as constraints;

[0015] If the working state of the traction machine is the power consumption state, the power grid, the photovoltaic power generation device and the energy storage device are continuously energy dispatched according to the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device.

[0016] Furthermore, energy scheduling is performed on the energy storage device and the grid-connected converter using the remaining power of the energy storage device and the DC bus voltage as constraint conditions, including:

[0017] Determining whether the remaining power of the energy storage device has reached a preset power upper limit;

[0018] If not, controlling the energy storage device to charge, and then controlling the charging power of the energy storage device according to the DC bus voltage, so that the DC bus voltage is maintained at a target DC bus voltage value;

[0019] If yes, the energy storage device is controlled to stop charging, and then the grid-connected power generation of the grid-connected converter is controlled according to the DC bus voltage, so that the DC bus voltage is maintained at the target DC bus voltage value.

[0020] Furthermore, energy scheduling is performed on the power grid, the photovoltaic power generation device and the energy storage device according to the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, including:

[0021] Determine the magnitude relationship between the power generation of the photovoltaic power generation device and the power consumption of the traction machine;

[0022] If the power generation power of the photovoltaic power generation device is greater than the power consumption of the traction machine, it is determined whether the remaining power of the energy storage device has reached a preset power upper limit; if not, the energy storage device is controlled to charge, and the charging power of the energy storage device is set to the difference between the power generation power of the photovoltaic power generation device and the power consumption of the traction machine; if reached, the energy storage device is controlled to stop charging, and the power generation power of the photovoltaic power generation device is controlled to be equal to the power consumption of the traction machine;

[0023] If the power generation power of the photovoltaic power generation device is less than the power consumption of the traction machine, it is determined whether the remaining power of the energy storage device has reached a preset lower limit; if not, the energy storage device is controlled to discharge, and the discharge power of the energy storage device is controlled to be equal to the difference between the power consumption of the traction machine and the power generation power of the photovoltaic power generation device; if reached, the energy storage device is controlled to stop discharging, and the grid-connected converter is controlled to switch to the grid power supply state, and the grid power supply power is controlled to be equal to the difference between the power consumption of the traction machine and the power generation power of the photovoltaic power generation device.

[0024] Furthermore, if the power generation power of the photovoltaic power generation device is greater than the power consumption of the traction machine, energy scheduling is performed on the power grid, the photovoltaic power generation device and the energy storage device according to the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, further comprising:

[0025] Determine whether it is possible to sell electricity to the grid;

[0026] If it is possible to sell electricity on the grid, the grid-connected converter is controlled to switch to the grid-connected power generation state, and the sum of the grid-connected power generation of the grid-connected converter, the charging power of the energy storage device and the power consumption of the traction machine is controlled to be equal to the power generation power of the photovoltaic power generation device;

[0027] If it is not possible to sell electricity through the grid, the grid-connected converter is controlled to stop working, and the sum of the charging power of the energy storage device and the power consumption of the traction machine is controlled to be equal to the power generation power of the photovoltaic power generation device.

[0028] Further, after controlling the grid-connected converter to switch to the grid power supply state, the energy scheduling method further includes:

[0029] Determining whether the grid-connected converter has a margin;

[0030] If yes, the power grid is controlled to charge the energy storage device until the remaining power of the energy storage device reaches a preset power; wherein the preset power is greater than the preset power lower limit and less than the preset power upper limit.

[0031] The present invention also provides an energy dispatching device, which is applied to a DC elevator. The DC elevator includes a photovoltaic power generation device, an energy storage device, an energy storage converter, a traction machine, and a grid-connected converter. The energy dispatching device includes:

[0032] A judging module, used for judging the working state of the traction machine; wherein the working state includes a power consumption state and a power generation state;

[0033] The energy scheduling module is used to schedule the energy of the power grid, the photovoltaic power generation device and the energy storage device according to the working state of the traction machine, the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, so that the remaining power of the energy storage device is between a preset upper power limit and a preset lower power limit.

[0034] The present invention also provides a DC elevator, comprising a photovoltaic power generation device, an energy storage device, an energy storage converter, a traction machine, a grid-connected converter, and the above-mentioned energy dispatching device.

[0035] Furthermore, a communication line is provided between the grid-connected converter and the energy storage converter for transmitting the working status of the traction machine, the grid-connected power generation and the charging and discharging instructions.

[0036] The present invention also provides a computer-readable storage medium having a computer program stored thereon, and the program implements the above energy scheduling method when executed by a processor.

[0037] The present invention also provides an electronic device, comprising:

[0038] one or more processors;

[0039] A storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned energy scheduling method.

[0040] By applying the technical solution of the present invention, energy scheduling is performed on the power grid, the photovoltaic power generation device and the energy storage device according to the working state of the traction machine, the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, so that the remaining power of the energy storage device is between a preset upper power limit and a preset lower power limit. This can avoid the problem that the power of the energy storage device is too high or too low, and the power supply and power consumption of the DC elevator cannot be guaranteed at all times, thereby improving the operating reliability and safety of the DC elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a system structure diagram of an existing DC elevator;

[0042] Figure 2 is a flow chart of an energy scheduling method according to an embodiment of the present invention;

[0043] Figure 3 is a flow chart of an energy scheduling method according to another embodiment of the present invention;

[0044] Figure 4 is a structural diagram of an energy scheduling device according to an embodiment of the present invention;

[0045] Figure 5 is a system structure diagram of a DC elevator according to an embodiment of the present invention;

[0046] Figure 6 FIG. 4 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0049] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0050] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0051] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0052] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0053] Example 1

[0054] Figure 1 The system structure diagram of the existing DC elevator is as follows: Figure 1 As shown, the DC elevator includes: a photovoltaic power generation device, an energy storage device, an energy storage inverter, a traction machine, a grid-connected inverter, an energy storage inverter, a photovoltaic inverter, a traction machine inverter, an auxiliary inverter and a door machine inverter. The grid-connected converter is arranged between the power grid and the DC bus, and is used to convert the AC power of the power grid into DC power and then output it to the DC bus; the energy storage converter is arranged between the DC bus and the energy storage device, and is used to charge and discharge the energy storage device; the photovoltaic converter is arranged between the photovoltaic power generation device and the DC bus, and is used to output the electric energy generated by the photovoltaic power generation device to the DC bus; the traction machine converter is arranged between the traction machine and the DC bus, and is used to control the traction machine to take power from the DC bus or transmit power to the DC bus; the auxiliary converter is arranged between the display operation box, the hall call box, the lighting, the cross-flow fan, the light curtain, the speed limiter, the brake and other components and the DC bus, and is mainly used to supply power to the display operation box, the hall call box, the lighting, the cross-flow fan, the light curtain, the speed limiter, the brake and other components; the door machine converter is arranged between the DC bus and the door machine of the DC elevator, and is used to convert the DC power of the DC bus into AC power to control the operation of the door machine.

[0055] In the existing elevator energy recovery technology, energy storage devices (such as batteries) are usually used to recover and store the energy generated by the elevator traction machine. When the traction machine uses electricity, the energy storage device releases the electricity for the operation of the traction machine. However, when the power grid is off or there is a disaster such as a fire, the elevator can only rely on the electricity stored in the energy storage device to maintain operation. If the energy stored in the energy storage device is insufficient at this time, the elevator will stop operating, posing a threat to the safety of the users. In addition, when the traction machine generates electricity, if the energy storage device is fully charged, it cannot absorb the electricity generated by the traction machine, which will cause this part of the electricity to be fed into the grid. When the power grid is off or abnormal, this part of the electricity cannot be absorbed, which will also cause abnormal operation of the elevator.

[0056] In view of the problem that the power of the energy storage device in the DC elevator in the prior art is too high or too low, and the power supply and power consumption of the DC elevator cannot be guaranteed at all times, this embodiment provides an energy scheduling method, which is applied to the DC elevator, as mentioned above. Figure 1 As shown, the DC elevator includes a photovoltaic power generation device, an energy storage device, an energy storage converter, a traction machine, and a grid-connected converter. Figure 2 is a flow chart of an energy scheduling method according to an embodiment of the present invention. Figure 2 As shown, the energy scheduling method includes:

[0057] S101, determining the working state of the traction machine; wherein the working state includes the power consumption state and the power generation state.

[0058] When the elevator is accelerating, the traction machine is in a power consumption state; when the elevator is decelerating and braking, the traction machine is in a power generation state. The flow of electric energy is different in the power generation and power consumption states of the traction machine. Therefore, different energy scheduling strategies need to be adopted for different operating states of the traction machine.

[0059] S102, scheduling the power grid, the photovoltaic power generation device and the energy storage device according to the working state of the traction machine, the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, so that the remaining power of the energy storage device is between a preset upper power limit and a preset lower power limit.

[0060] On the one hand, in order to avoid excessive energy consumption of the energy storage device, which may result in the remaining power of the energy storage device being insufficient to maintain the operation of the elevator when the power grid fails or disasters such as fire occur, it is necessary to determine the preset power lower limit according to the actual situation, so that the remaining power of the energy storage device is not lower than the preset power lower limit, to ensure that the elevator can operate normally when the power grid fails or disasters such as fire occur; on the other hand, in order to avoid the remaining power of the energy storage device being too high and unable to absorb the electric energy generated by the traction machine, resulting in this part of the electric energy only being fed into the grid, when the power grid fails or is abnormal, this part of the electric energy cannot be absorbed, resulting in abnormal operation of the elevator, it is also necessary to determine the preset power upper limit according to the actual situation, so that the remaining power of the energy storage device is not higher than the preset power upper limit, to avoid the problem that the electric energy generated by the traction machine cannot be absorbed.

[0061] The energy dispatching method of this embodiment dispatches energy of the power grid, the photovoltaic power generation device and the energy storage device according to the working status of the traction machine, the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, so that the remaining power of the energy storage device is between a preset upper power limit and a preset lower power limit. This can avoid the problem that the power of the energy storage device is too high or too low, and the power supply and power consumption of the DC elevator cannot be guaranteed at all times, thereby improving the operating reliability and safety of the DC elevator.

[0062] Since the direction of the current is different when the traction machine is consuming electricity and generating electricity, in order to accurately determine whether the traction machine is in a power-consuming state or a power-generating state, the working state of the traction machine is determined, including: determining whether the current value on the AC side of the grid-connected converter is positive or negative; if the current value on the AC side of the grid-connected converter is negative, determining that the working state of the traction machine is a power-generating state; if the current value on the AC side of the grid-connected converter is positive, determining that the working state of the traction machine is a power-consuming state.

[0063] When the elevator traction machine is in deceleration braking operation, that is, in the power generation state, the grid-connected converter will determine that the traction machine is in power generation according to the direction of the current. The grid-connected converter of this embodiment can adopt a voltage source grid-connected converter, and the control target of the grid-connected converter is the DC bus voltage, so that its actual value reaches the DC bus voltage reference value Udc. In the synchronous coordinate axis system oriented by the grid voltage, the active power of the system is only related to the D-axis current, and the power change of the system is reflected by the high and low DC bus voltage. Controlling the DC bus voltage to be constant is to control the balance of the system power. In order to avoid excessive discharge and charging, the remaining power of the energy device is guaranteed to be between the preset upper limit and the preset lower limit, and the DC bus voltage is guaranteed to be constant, thereby achieving power balance. According to the working state of the traction machine, the power generation power of the photovoltaic power generation device, and the remaining power of the energy storage device, the grid, the photovoltaic power generation device and the energy storage device are energy-scheduled so that the remaining power of the energy storage device is between the preset upper limit and the preset lower limit, including: if the working state of the traction machine is the power generation state, the grid-connected converter is controlled to switch to the grid-connected power generation state, and then the energy storage device and the grid-connected converter are energy-scheduled with the remaining power of the energy storage device and the DC bus voltage as constraints; if the working state of the traction machine is the power consumption state, the grid, the photovoltaic power generation device and the energy storage device are continuously energy-scheduled according to the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device.

[0064] Since the electric energy generated by the traction machine may contain harmonics, it will affect the power quality of the power grid, and direct grid feeding will not generate corresponding economic value. Based on the above considerations, when the traction machine is in the power generation state, it is necessary to give priority to storing the electric energy generated by the traction machine in the energy storage device, that is, using the electric energy generated by the traction machine to charge the energy storage device. However, according to the above-mentioned remaining power of the energy storage device cannot exceed the preset power upper limit, therefore, the remaining power of the energy storage device and the DC bus voltage are used as constraints to perform energy scheduling on the energy storage device and the grid-connected converter, including: judging the energy storage device whether the remaining power of the energy storage device reaches a preset power upper limit; if the remaining power of the energy storage device does not reach the preset power upper limit, the energy storage device is controlled to charge according to the preset power, and then the grid-connected power generation power of the grid-connected converter is controlled according to the DC bus voltage, so that the DC bus voltage is maintained at a target DC bus voltage value, thereby achieving power balance; if the remaining power of the energy storage device reaches the preset power upper limit, the energy storage device is controlled to stop charging, and then the grid-connected power generation power of the grid-connected converter is controlled according to the DC bus voltage, so that the DC bus voltage is maintained at a target DC bus voltage value, thereby achieving power balance.

[0065] When the traction machine is in the power consumption state, it is still necessary to ensure the balance between power generation and power consumption. In addition, since the electricity generated by photovoltaic power generation devices has the advantages of being clean, pollution-free and low-cost, in order to save costs and reduce pollution, the electricity generated by photovoltaic power generation devices should be used first. At the same time, it is also necessary to ensure that the remaining power of the energy storage device is not higher than the preset upper limit and not lower than the preset lower limit.

[0066] Therefore, energy scheduling is performed on the power grid, the photovoltaic power generation device and the energy storage device according to the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, including: judging the relationship between the power generation power of the photovoltaic power generation device and the power consumption of the traction machine; if the power generation power of the photovoltaic power generation device is greater than the power consumption of the traction machine, judging whether the remaining power of the energy storage device has reached a preset power upper limit; if not, controlling the energy storage device to charge, and setting the charging power of the energy storage device to the difference between the power generation power of the photovoltaic power generation device and the power consumption of the traction machine; if reached, controlling the energy storage device to stop charging, and controlling the power generation power of the photovoltaic power generation device to be equal to the power consumption of the traction machine, that is, controlling the photovoltaic power generation device to operate with limited power.

[0067] If the power generation power of the photovoltaic power generation device is less than the power consumption of the traction machine, it is determined whether the remaining power of the energy storage device has reached the preset power lower limit; if not, the energy storage device is controlled to discharge, and the discharge power of the energy storage device is controlled to be equal to the difference between the power consumption of the traction machine and the power generation power of the photovoltaic power generation device; if it is reached, the energy storage device is controlled to stop discharging, and the grid-connected converter is controlled to switch to the grid power supply state, and the grid power supply power is controlled to be equal to the difference between the power consumption of the traction machine and the power generation power of the photovoltaic power generation device;

[0068] It should be noted that if the power generation of the photovoltaic power generation device is equal to the power consumption of the traction machine, the photovoltaic power generation device can be directly controlled to maintain the current power to supply power to the traction machine without the involvement of an energy storage device.

[0069] If the power generation of the photovoltaic power generation device is greater than the power consumption of the traction machine, and it can be connected to the grid to sell electricity, in order to maximize economic benefits, the electricity generated by the photovoltaic power generation device can be sold to the power grid and exchanged for economic value. Therefore, if the power generation of the photovoltaic power generation device is greater than the power consumption of the traction machine, the power grid, the photovoltaic power generation device and the energy storage device are energy dispatched according to the power generation of the photovoltaic power generation device and the remaining power of the energy storage device, and it also includes: determining whether it is possible to sell electricity in connection with the grid; if it is possible to sell electricity in connection with the grid, the grid-connected converter is controlled to switch to the grid-connected power generation state, and the sum of the grid-connected power generation of the grid-connected converter, the charging power of the energy storage device and the power consumption of the traction machine is controlled to be equal to the power generation of the photovoltaic power generation device; if it is not possible to sell electricity in connection with the grid, the grid-connected converter is controlled to stop working, and the sum of the charging power of the energy storage device and the power consumption of the traction machine is controlled to be equal to the power generation of the photovoltaic power generation device.

[0070] If the power generation of the photovoltaic power generation device is less than the power consumption of the traction machine, and the energy storage battery cannot continue to discharge, the remaining power gap needs to be supplemented by the power grid. Since the energy storage battery cannot continue to discharge, it is already in a critical dangerous state. In order to ensure the safe and reliable operation of the DC elevator, after controlling the grid-connected converter to switch to the grid power supply state, the above energy scheduling method also includes: judging whether there is a margin in the grid-connected converter; if so, controlling the grid to charge the energy storage device until the remaining power of the energy storage device reaches a preset power; wherein the preset power is greater than the preset lower limit of power and less than the preset upper limit of power; if not, there is no need to perform the above operation.

[0071] Example 2

[0072] This embodiment provides another energy scheduling method. Figure 3 is a flow chart of an energy scheduling method according to another embodiment of the present invention. Figure 3 As shown, the method includes:

[0073] S1, initialize the system and set the execution times of the energy scheduling method c=0.

[0074] S2, determine whether the AC side current value Iac(t) of the grid-connected converter is less than 0; if yes, execute step S3; if not, execute step S5.

[0075] S3, controlling the grid-connected converter to switch to the grid-connected power generation state, and sending the grid-connected power generation of the grid-connected converter to the energy storage converter.

[0076] S4, the energy storage device controls whether to charge itself and the charging power according to the grid-connected power generation and its own remaining power.

[0077] When the elevator's traction machine is in deceleration braking operation, that is, in the power generation state, the grid-connected converter will determine that the traction machine is in power generation according to the direction of the current. The grid-connected converter of this embodiment can adopt a voltage source grid-connected converter, and the control target of the grid-connected converter is the DC bus voltage, so that its actual value reaches the DC bus voltage reference value Udc. In the synchronous coordinate axis system oriented by the grid voltage, the active power of the system is only related to the D-axis current, and the power change of the system is reflected by the high and low DC bus voltage. Controlling the DC bus voltage to be constant is to control the balance of the system power. In order to avoid excessive discharge and charging, the remaining power of the energy device is guaranteed to be between the preset upper and lower limits of the power, and at the same time, the DC bus voltage is guaranteed to be constant, thereby achieving power balance. The energy storage device controls whether to charge itself and the charging power according to the grid-connected power generation power and its own remaining power. If the remaining power of the energy storage device is lower than the preset upper limit, and before the energy storage device is charged, the grid-connected power generation has made the DC bus voltage reach the target DC bus voltage value, then the charging power of the energy storage device is directly equal to the power generation power of the grid-connected converter, that is, the charging power of the energy storage device Pess1(t) = the grid-connected power generation power Pgrid(t), where t is the execution time.

[0078] In addition, the grid-connected converter and the energy storage converter communicate through CAN communication or other means to inform the energy storage converter that there is currently surplus energy and the energy storage can be charged. If the energy storage device meets the charging operation conditions, it switches to charging the energy storage converter and charges the electric energy generated by the traction machine into the energy storage. The energy storage converter obtains the grid-connected power size of the grid-connected converter through real-time communication to achieve the setting of the charging power.

[0079] S5, determine the size relationship between Ppv(t) and Plift(t); if Ppv(t)=Plift(t), execute step S6, if Ppv(t)>Plift(t), execute step S7, if Ppv(t)<Plift(t), execute step S9.

[0080] Among them, Ppv(t) is the photovoltaic power generation power, and Plift(t) is the power consumption of the traction machine.

[0081] S6, controlling the photovoltaic power generation device to maintain the current power to supply power to the traction machine.

[0082] S7, determine whether the remaining power of the energy storage device reaches the preset power upper limit SOC1, if yes, control the energy storage device to charge, if not, control the energy storage device to stop charging, and set Pess1(t)=0.

[0083] S8, determine whether it is possible to sell electricity through the grid. If so, control Pgrid1(t)=Ppv(t)-PlIft(t)-Pess1(t). If it is not possible to sell electricity through the grid, control the photovoltaic power generation device to operate with limited power, and control Ppv(t)=Pess(t)+PlIft(t).

[0084] If grid-connected power generation is not possible and the energy storage device is charged to the preset upper limit and can no longer absorb electricity, the power output of the photovoltaic power generation device will be limited to ensure system power balance.

[0085] Among them, Pgrid1(t) is the grid-connected power generation.

[0086] S9, determine whether the remaining power SOC(t) of the energy storage device reaches a preset power lower limit SOC2; if yes, execute step S10; if not, execute step S12.

[0087] S10, controlling the energy storage device to discharge, and controlling the energy storage discharge power Pess2(t)=PlIft(t)-Ppv(t), using the energy storage device as the main power source to smooth out the unbalanced power of the system.

[0088] S11, controlling the power generation power Pgrid2(t) of the power grid to be 0, so that the power grid remains in an online standby state.

[0089] S12, control the power generation power of the grid Pgrid2(t)=PlIft(t)-Ppv(t), and the grid acts as the main power source to smooth out the unbalanced power of the system.

[0090] S13, if the grid-connected converter still has margin, the power grid is controlled to charge the energy storage device until the remaining power of the energy storage device SOC(t)=SOC2+X.

[0091] When the elevator traction machine is in the power consumption state, when the photovoltaic power generation power is insufficient, that is, Ppv(t)<Plift(t), the energy storage device can be used for discharge or grid power supply. However, in order to ensure the safety of the elevator and increase the risk of elevator shutdown when the grid is powered off or in disasters such as fire, it is necessary to at least maintain the preset power lower limit SOC2, such as 40%. When the remaining power of the energy storage device is lower than the above preset power lower limit SOC2, the energy storage device is not used for discharge, and only the grid power is used to supplement the power gap until the remaining power of the energy storage device SOC(t)=SOC2+X, where X is set to 10% to achieve a certain redundancy; when the photovoltaic power generation power is sufficient, that is, Ppv(t)>Plift(t), the energy storage device can be charged. In order to ensure that the energy storage can absorb the energy generated by the elevator at any time and avoid the redundant photovoltaic power from being connected to the grid when the grid is powered off or abnormal, a preset power upper limit SOC1 needs to be set to ensure a certain charging margin, such as 80%.

[0092] S14, determine whether the time t is greater than a preset threshold; if yes, execute step S15, if not, set the execution times c=c+1, and then return to step S2.

[0093] The preset threshold may be one hour, one day, or one week.

[0094] S15, generating typical operation data.

[0095] Example 3

[0096] This embodiment provides an energy dispatching device, which is applied to a DC elevator. The DC elevator includes a photovoltaic power generation device, an energy storage device, an energy storage converter, a traction machine, and a grid-connected converter. Figure 4 is a structural diagram of an energy scheduling device according to an embodiment of the present invention, such as Figure 4 As shown, the energy scheduling device includes:

[0097] The judging module 10 is used to judge the working state of the traction machine; wherein the working state includes the power consumption state and the power generation state.

[0098] When the elevator is accelerating, the traction machine is in a power consumption state; when the elevator is decelerating and braking, the traction machine is in a power generation state. The flow of electric energy is different in the power generation and power consumption states of the traction machine. Therefore, different energy scheduling strategies need to be adopted for different operating states of the traction machine.

[0099] The energy scheduling module 20 is used to schedule the energy of the power grid, the photovoltaic power generation device and the energy storage device according to the working state of the traction machine, the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, so that the remaining power of the energy storage device is between a preset upper limit and a preset lower limit.

[0100] On the one hand, in order to avoid excessive energy consumption of the energy storage device, which may result in the remaining power of the energy storage device being insufficient to maintain the operation of the elevator when the power grid fails or disasters such as fire occur, it is necessary to determine the preset power lower limit according to the actual situation, so that the remaining power of the energy storage device is not lower than the preset power lower limit, to ensure that the elevator can operate normally when the power grid fails or disasters such as fire occur; on the other hand, in order to avoid the remaining power of the energy storage device being too high and unable to absorb the electric energy generated by the traction machine, resulting in this part of the electric energy only being fed into the grid, when the power grid fails or is abnormal, this part of the electric energy cannot be absorbed, resulting in abnormal operation of the elevator, it is also necessary to determine the preset power upper limit according to the actual situation, so that the remaining power of the energy storage device is not higher than the preset power upper limit, to avoid the problem that the electric energy generated by the traction machine cannot be absorbed.

[0101] The energy dispatching device of this embodiment dispatches energy of the power grid, the photovoltaic power generation device and the energy storage device according to the working state of the traction machine, the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device through the energy dispatching module 20, so that the remaining power of the energy storage device is between the preset upper limit and the preset lower limit. This can avoid the problem that the power of the energy storage device is too high or too low, and the power supply and power consumption of the DC elevator cannot be guaranteed at all times, thereby improving the operating reliability and safety of the DC elevator.

[0102] Since the direction of the current is different when the traction machine is using electricity and generating electricity, in order to accurately judge whether the traction machine is in a power-using state or a power-generating state, the judgment module 10 judges the working state of the traction machine by performing the following specific operations: judging whether the current value on the AC side of the grid-connected converter is positive or negative; if the current value on the AC side of the grid-connected converter is negative, judging that the working state of the traction machine is a power-generating state; if the current value on the AC side of the grid-connected converter is positive, judging that the working state of the traction machine is a power-using state.

[0103] When the elevator traction machine is in deceleration braking operation, that is, in the power generation state, the grid-connected converter will determine that the traction machine is in power generation according to the direction of the current. The grid-connected converter of this embodiment can adopt a voltage source grid-connected converter, and the control target of the grid-connected converter is the DC bus voltage, so that its actual value reaches the DC bus voltage reference value Udc. In the synchronous coordinate axis system oriented by the grid voltage, the active power of the system is only related to the D-axis current, and the power change of the system is reflected by the high and low DC bus voltage. Controlling the DC bus voltage to be constant is to control the balance of the system power. In order to avoid excessive discharge and charging, the remaining power of the energy device is guaranteed to be between the preset upper limit and the preset lower limit, and the DC bus voltage is guaranteed to be constant, thereby achieving power balance. The energy scheduling module 20 performs energy scheduling on the grid, the photovoltaic power generation device and the energy storage device according to the working state of the traction machine, the power generation power of the photovoltaic power generation device, and the remaining power of the energy storage device. When the remaining power of the energy storage device is between the preset upper limit and the preset lower limit, the following operations are specifically performed: if the working state of the traction machine is the power generation state, the grid-connected converter is controlled to switch to the grid-connected power generation state, and then the energy storage device and the grid-connected converter are energy scheduled with the remaining power of the energy storage device and the DC bus voltage as constraints; if the working state of the traction machine is the power consumption state, the grid, the photovoltaic power generation device and the energy storage device are continuously energy scheduled according to the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device.

[0104] Since the electric energy generated by the traction machine may contain harmonics, it will affect the power quality of the power grid, and direct grid feeding will not generate corresponding economic value. Based on the above considerations, when the traction machine is in the power generation state, it is necessary to give priority to storing the electric energy generated by the traction machine in the energy storage device, that is, using the electric energy generated by the traction machine to charge the energy storage device. However, according to the above-mentioned remaining power of the energy storage device cannot exceed the preset power upper limit. Therefore, when the energy scheduling module 20 uses the remaining power of the energy storage device and the DC bus voltage as constraints to perform energy scheduling on the energy storage device and the grid-connected converter, it specifically performs the following operations: The method comprises the following steps: determining whether the remaining power of the energy storage device has reached a preset power upper limit; if the remaining power of the energy storage device has not reached the preset power upper limit, controlling the energy storage device to charge according to the preset power, and then controlling the grid-connected power generation of the grid-connected converter according to the DC bus voltage, so that the DC bus voltage is maintained at a target DC bus voltage value, thereby achieving power balance; if the remaining power of the energy storage device has reached the preset power upper limit, controlling the energy storage device to stop charging, and then controlling the grid-connected power generation of the grid-connected converter according to the DC bus voltage, so that the DC bus voltage is maintained at a target DC bus voltage value, thereby achieving power balance.

[0105] When the traction machine is in the power consumption state, it is still necessary to ensure the balance between power generation and power consumption. In addition, since the electricity generated by photovoltaic power generation devices has the advantages of being clean, pollution-free and low-cost, in order to save costs and reduce pollution, the electricity generated by photovoltaic power generation devices should be used first. At the same time, it is also necessary to ensure that the remaining power of the energy storage device is not higher than the preset upper limit and not lower than the preset lower limit.

[0106] Therefore, when the energy scheduling module 20 schedules the energy of the power grid, the photovoltaic power generation device and the energy storage device according to the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, it specifically performs the following operations: determine the relationship between the power generation power of the photovoltaic power generation device and the power consumption of the traction machine; if the power generation power of the photovoltaic power generation device is greater than the power consumption of the traction machine, determine whether the remaining power of the energy storage device has reached a preset upper limit; if not, control the charging of the energy storage device, and set the charging power of the energy storage device to the difference between the power generation power of the photovoltaic power generation device and the power consumption of the traction machine; if reached, control the energy storage device to stop charging, and control the power generation power of the photovoltaic power generation device to be equal to the power consumption of the traction machine, that is, control the photovoltaic power generation device to operate with limited power.

[0107] If the power generation power of the photovoltaic power generation device is less than the power consumption of the traction machine, it is determined whether the remaining power of the energy storage device reaches the preset power lower limit; if not, the energy storage device is controlled to discharge, and the discharge power of the energy storage device is controlled to be equal to the difference between the power consumption of the traction machine and the power generation power of the photovoltaic power generation device; if reached, the energy storage device is controlled to stop discharging, and the grid-connected converter is controlled to switch to the grid power supply state, and the grid power supply power is controlled to be equal to the difference between the power consumption of the traction machine and the power generation power of the photovoltaic power generation device;

[0108] It should be noted that if the power generation of the photovoltaic power generation device is equal to the power consumption of the traction machine, the photovoltaic power generation device can be directly controlled to maintain the current power to supply power to the traction machine without the involvement of an energy storage device.

[0109] If the power generation of the photovoltaic power generation device is greater than the power consumption of the traction machine, and it can be connected to the grid to sell electricity, in order to maximize economic benefits, the electric energy generated by the photovoltaic power generation device can be sold to the power grid and exchanged for economic value. Therefore, if the power generation of the photovoltaic power generation device is greater than the power consumption of the traction machine, the energy scheduling module 20 can also perform the following operations when scheduling the power grid, the photovoltaic power generation device and the energy storage device according to the power generation of the photovoltaic power generation device and the remaining power of the energy storage device: determine whether it is possible to sell electricity in connection with the grid; if it is possible to sell electricity in connection with the grid, control the grid-connected converter to switch to the grid-connected power generation state, and control the sum of the grid-connected power generation of the grid-connected converter, the charging power of the energy storage device and the power consumption of the traction machine to be equal to the power generation of the photovoltaic power generation device; if it is not possible to sell electricity in connection with the grid, control the grid-connected converter to stop working, and control the sum of the charging power of the energy storage device and the power consumption of the traction machine to be equal to the power generation of the photovoltaic power generation device.

[0110] If the power generation of the photovoltaic power generation device is less than the power consumption of the traction machine, and the energy storage battery cannot continue to discharge, the remaining power gap needs to be supplemented by the power grid. Since the energy storage battery cannot continue to discharge, it is already in a critical dangerous state. In order to ensure the safe and reliable operation of the DC elevator, the energy scheduling module 20 can also perform the following operations after controlling the grid-connected converter to switch to the grid power supply state: determine whether there is a margin in the grid-connected converter; if so, control the grid to charge the energy storage device until the remaining power of the energy storage device reaches a preset power; wherein the preset power is greater than the preset lower limit and less than the preset upper limit; if not, there is no need to perform the above operations.

[0111] Example 4

[0112] This embodiment provides a DC elevator, including a photovoltaic power generation device, an energy storage device, an energy storage inverter, a traction machine, a grid-connected inverter, and also includes the energy scheduling device of the above embodiment.

[0113] Figure 5 The system structure diagram of the DC elevator according to the embodiment of the present invention is shown in FIG. In the prior art, a general energy dispatching module is often used to obtain information such as the power of photovoltaic power generation devices, energy storage devices, power grids, and traction machines, and then dispatch them. However, such a communication structure is relatively overloaded, and once a communication abnormality occurs in one of the above links, the entire dispatching plan cannot be completed. In order to improve the above problems, Figure 5 As shown, in this embodiment, a communication line is set between the grid-connected converter and the energy storage converter for transmitting the working status of the traction machine, the grid-connected power generation and the charging and discharging instructions, which can realize local point-to-point communication and avoid the problem that a communication anomaly in one of the above links will cause the entire scheduling plan to fail to be completed.

[0114] Example 5

[0115] This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the energy scheduling method of the above embodiment is implemented.

[0116] Example 6

[0117] This embodiment provides an electronic device, including:

[0118] one or more processors;

[0119] A storage device is used to store one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors implement the energy scheduling method of the above embodiment.

[0120] Figure 6 FIG. 1 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Figure 6 As shown, the electronic device includes:

[0121] One or more processors 610 and memory 620, Figure 6 A processor 610 is taken as an example.

[0122] The electronic device may further include: an input device 630 and an output device 640 .

[0123] The processor 610, the memory 620, the input device 630 and the output device 640 may be connected via a bus or other means. Figure 6 The example of connecting through bus is taken in the following.

[0124] The memory 620 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the energy scheduling method in the embodiment of the present invention. The processor 610 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 620, that is, implementing the above method embodiment.

[0125] The memory 620 may include a program storage area and a data storage area, wherein the program storage area may store an application required for operating the device and at least one function; the data storage area may store data created according to the use of the energy scheduling device, etc. In addition, the memory 620 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0126] The input device 630 can receive input digital or character information and generate key signal input related to user settings and function control of the electronic device. The output device 640 can include a display device such as a display screen.

[0127] The one or more modules are stored in the memory 620, and when executed by the one or more processors 610, the energy scheduling method in any of the above method embodiments is executed.

[0128] The electronic device can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0129] The electronic devices of the embodiments of the present invention exist in various forms, including but not limited to:

[0130] (1) Mobile communication devices: These devices are characterized by their mobile communication functions and their main purpose is to provide voice and data communications. These terminals include: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones.

[0131] (2) Ultra-mobile personal computer devices: These devices fall into the category of personal computers, have computing and processing capabilities, and generally also have mobile Internet access features. These terminals include: PDA, MID and UMPC devices, such as iPad.

[0132] (3) Portable entertainment devices: These devices can display and play multimedia content. They include audio and video players (such as iPods), handheld game consoles, e-books, as well as smart toys and portable car navigation devices.

[0133] (4) Server: A device that provides computing services. The server consists of a processor, hard disk, memory, device bus, etc. The server is similar to the general computer architecture, but because it needs to provide highly reliable services, it has higher requirements in terms of processing power, stability, reliability, security, scalability, manageability, etc.

[0134] (5) Other electronic devices with data interaction functions, such as televisions, large-screen cars, etc.

[0135] The device embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, i.e., they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0136] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the energy scheduling method described in each embodiment or some parts of the embodiment.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy dispatching method, applied to a DC elevator, wherein the DC elevator comprises a photovoltaic power generation device, an energy storage device, an energy storage converter, a traction machine, and a grid-connected converter, characterized in that: The energy scheduling method comprises: Determining the working state of the traction machine; wherein the working state includes a power consumption state and a power generation state; The power grid, the photovoltaic power generation device and the energy storage device are energy-scheduled according to the working state of the traction machine, the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, so that the remaining power of the energy storage device is between a preset upper power limit and a preset lower power limit.

2. The energy scheduling method according to claim 1, characterized in that: Determining the working state of the traction machine includes: Determining whether the current value on the AC side of the grid-connected converter is positive or negative; If the current value of the AC side of the grid-connected converter is negative, it is determined that the working state of the traction machine is a power generation state; If the current value of the AC side of the grid-connected converter is positive, it is determined that the working state of the traction machine is a power consumption state.

3. The energy scheduling method according to claim 1, characterized in that: The power grid, the photovoltaic power generation device and the energy storage device are energy-scheduled according to the working state of the traction machine, the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, so that the remaining power of the energy storage device is between a preset upper power limit and a preset lower power limit, including: If the working state of the traction machine is the power generation state, the grid-connected converter is controlled to switch to the grid-connected power generation state, and then the energy storage device and the grid-connected converter are energy-scheduled based on the remaining power of the energy storage device and the DC bus voltage as constraints; If the working state of the traction machine is the power consumption state, the power grid, the photovoltaic power generation device and the energy storage device are continuously energy dispatched according to the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device.

4. The energy scheduling method according to claim 3, characterized in that: The energy storage device and the grid-connected converter are energy-scheduled using the remaining power of the energy storage device and the DC bus voltage as constraints, including: Determining whether the remaining power of the energy storage device has reached a preset power upper limit; If not, controlling the energy storage device to charge, and then controlling the charging power of the energy storage device according to the DC bus voltage, so that the DC bus voltage is maintained at a target DC bus voltage value; If yes, the energy storage device is controlled to stop charging, and then the grid-connected power generation of the grid-connected converter is controlled according to the DC bus voltage, so that the DC bus voltage is maintained at the target DC bus voltage value.

5. The energy scheduling method according to claim 3, characterized in that: The power grid, the photovoltaic power generation device and the energy storage device are energy dispatched according to the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, including: Determine the magnitude relationship between the power generation of the photovoltaic power generation device and the power consumption of the traction machine; If the power generation power of the photovoltaic power generation device is greater than the power consumption of the traction machine, it is determined whether the remaining power of the energy storage device has reached a preset power upper limit; if not, the energy storage device is controlled to charge, and the charging power of the energy storage device is set to the difference between the power generation power of the photovoltaic power generation device and the power consumption of the traction machine; if reached, the energy storage device is controlled to stop charging, and the power generation power of the photovoltaic power generation device is controlled to be equal to the power consumption of the traction machine; If the power generation power of the photovoltaic power generation device is less than the power consumption of the traction machine, it is determined whether the remaining power of the energy storage device has reached a preset lower limit; if not, the energy storage device is controlled to discharge, and the discharge power of the energy storage device is controlled to be equal to the difference between the power consumption of the traction machine and the power generation power of the photovoltaic power generation device; if reached, the energy storage device is controlled to stop discharging, and the grid-connected converter is controlled to switch to the grid power supply state, and the grid power supply power is controlled to be equal to the difference between the power consumption of the traction machine and the power generation power of the photovoltaic power generation device.

6. The energy scheduling method according to claim 5, characterized in that: If the power generation of the photovoltaic power generation device is greater than the power consumption of the traction machine, energy scheduling is performed on the power grid, the photovoltaic power generation device and the energy storage device according to the power generation of the photovoltaic power generation device and the remaining power of the energy storage device, further comprising: Determine whether it is possible to sell electricity to the grid; If it is possible to sell electricity on the grid, the grid-connected converter is controlled to switch to the grid-connected power generation state, and the sum of the grid-connected power generation of the grid-connected converter, the charging power of the energy storage device and the power consumption of the traction machine is controlled to be equal to the power generation power of the photovoltaic power generation device; If it is not possible to sell electricity through the grid, the grid-connected converter is controlled to stop working, and the sum of the charging power of the energy storage device and the power consumption of the traction machine is controlled to be equal to the power generation power of the photovoltaic power generation device.

7. The energy scheduling method according to claim 5, characterized in that: After controlling the grid-connected converter to switch to a grid power supply state, the energy scheduling method further includes: Determining whether the grid-connected converter has a margin; If yes, the power grid is controlled to charge the energy storage device until the remaining power of the energy storage device reaches a preset power; wherein the preset power is greater than the preset power lower limit and less than the preset power upper limit.

8. An energy dispatching device, applied to a DC elevator, the DC elevator comprising a photovoltaic power generation device, an energy storage device, an energy storage converter, a traction machine, and a grid-connected converter, characterized in that: The device comprises: A judging module, used for judging the working state of the traction machine; wherein the working state includes a power consumption state and a power generation state; The energy scheduling module is used to schedule the energy of the power grid, the photovoltaic power generation device and the energy storage device according to the working state of the traction machine, the power generation power of the photovoltaic power generation device and the remaining power of the energy storage device, so that the remaining power of the energy storage device is between a preset upper power limit and a preset lower power limit.

9. A DC elevator, comprising a photovoltaic power generation device, an energy storage device, an energy storage converter, a traction machine, and a grid-connected converter, characterized in that: It also includes the energy scheduling device as described in claim 8.

10. The DC elevator according to claim 9, characterized in that: A communication line is provided between the grid-connected converter and the energy storage converter for transmitting the working state of the traction machine, the grid-connected power generation and the charging and discharging instructions.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the energy scheduling method according to any one of claims 1 to 7 is implemented.

12. An electronic device, characterized in that: include: one or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, enables the one or more processors to implement the energy scheduling method as described in any one of claims 1 to 7.

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