Energy management method, device, medium, equipment and system of in-phase power supply device

Abstract

The invention relates to the technical field of railway traction power supply, in particular to an energy management method, device, medium, equipment and system of an in-phase power supply device. The method comprises the following steps: acquiring incoming line current and incoming line voltage of an incoming line three-phase power grid of an in-phase power supply device; determining rectification side power and inversion side power according to the incoming line current and the incoming line voltage; performing closed-loop control on the inverter side power and the rectifier side power to obtain a rectifier side given current and an inverter side given current; and the in-phase power supply device performs energy management according to the given current of the rectification side and the given current of the inversion side. Closed-loop control is adopted, so that actual output power completely compensates negative sequence and reactive power, comprehensive treatment of the negative sequence and the reactive power is achieved, accurate compensation is achieved, the negative sequence is smaller than or equal to 1%, and the power factor is larger than or equal to 0.99.

Description

Technical Field

[0001] The present invention relates to the technical field of railway traction power supply, and specifically relates to an energy management method, device, medium, equipment and system for a same-phase power supply device. Background Art

[0002] The co-phase power supply system not only solves the problem of over-phase in the electrified railway system, but also compensates for the power quality, which helps to improve the working efficiency and stability of the traction power supply system. In the co-phase power supply system, the co-phase power supply device is its core equipment, which is responsible for converting the voltage phase as well as negative sequence compensation and reactive power compensation. In actual engineering applications, the co-phase power supply device is generally installed in the traction substation.

[0003] The core topology of the co-phase power supply device is the AC-DC-AC converter, which is responsible for converting the voltage of one phase of the traction transformer output and connecting it to the other phase of the traction transformer output, thereby eliminating the phase split structure and completing the power quality compensation by controlling the current output of the device. However, the co-phase power supply device is essentially a power electronic device. Its introduction changes the impedance distribution of the original system. The embedding of a large number of power electronic devices into the traction power supply system will undoubtedly bring about system stability problems.

[0004] The control strategy of the existing co-phase power supply device mainly chooses to compensate for the load current, which makes the impedance of the co-phase power supply device and the load impedance mutually coupled, that is, the impedance of the co-phase power supply device will change with the topology of the train and the change of the control method. The existing method has a simple algorithm and is easy to implement. It can control the negative sequence to less than 5% and the power factor to more than 0.95 in real time. However, it only compensates for the negative sequence and reactive power generated by the load on the traction network side, and does not consider the negative sequence and reactive power caused by the co-phase power supply system itself, SCOTT transformer, co-phase power supply device, and line. If the active and reactive power corresponding to the compensation transformer and line parameters are actively added, the system will be highly dependent on the parameters and not robust. Moreover, each parameter part is a time-varying parameter affected by the environment and working mode, which is difficult to implement in practice. Summary of the invention

[0005] In response to the above technical problems, the present invention proposes an energy management method, device, medium, equipment and system for a co-phase power supply device. The present application obtains the incoming current and voltage of the incoming three-phase power grid of the co-phase power supply device; determines the rectifier side power and the inverter side power according to the incoming current and the incoming voltage; obtains the rectifier side given current and the inverter side given current through closed-loop control of the inverter side power and the rectifier side power; the co-phase power supply device performs energy management according to the rectifier side given current and the inverter side given current. The present invention adopts closed-loop control to make the actual output power fully compensate for the negative sequence and reactive power, realize the comprehensive management of negative sequence and reactive power, and achieve precise compensation, realizing negative sequence ≤1% and power factor ≥0.99.

[0006] To solve the above technical problems, the technical solution provided by the present invention includes five aspects.

[0007] In the first aspect, the present application provides an energy management method for a same-phase power supply device, including: obtaining the incoming current and the incoming voltage of the three-phase power grid of the same-phase power supply device; determining the rectifier side power and the inverter side power according to the incoming current and the incoming voltage; obtaining a given rectifier side current and a given inverter side current by closed-loop controlling the inverter side power and the rectifier side power; and the same-phase power supply device performs energy management according to the given rectifier side current and the given inverter side current.

[0008] In some embodiments, the rectifier side power includes: rectifier side reactive power and rectifier side active power; the closed-loop control includes: active closed-loop control, first reactive closed-loop control and second reactive closed-loop control; the inverter side power includes: inverter side reactive power and inverter side active power; the inverter side power and the rectifier side power are subjected to closed-loop control to obtain a rectifier side given current and an inverter side given current: the rectifier side active power and the inverter side active power are subjected to the active closed-loop control to obtain a rectifier side active feedforward current and an inverter side active given current; the rectifier side reactive power is subjected to the first reactive closed-loop control to obtain a rectifier side reactive given current; the inverter side reactive power is subjected to the second reactive closed-loop control to obtain an inverter side reactive given current.

[0009] In some embodiments, the active power on the rectifier side and the active power on the inverter side are controlled through the active closed-loop to obtain the active feedforward current on the rectifier side and the active given current on the inverter side, including: determining the active difference according to the active power on the rectifier side and the active power on the inverter side; obtaining the transferred active current through the active closed-loop control of the active difference; and determining the active feedforward current on the rectifier side and the active given current on the inverter side according to the transferred active current.

[0010] In some embodiments, the reactive power on the rectifier side is controlled through the first reactive closed-loop to obtain a reactive given current on the rectifier side, including: obtaining a preset desired reactive power on the rectifier side and a first current limit of the rectifier side converter; determining a reactive difference on the rectifier side according to the desired reactive power on the rectifier side and the reactive power on the rectifier side; determining first reactive current upper and lower limits according to the first current limit and the active feedforward current on the rectifier side; and obtaining the reactive given current on the rectifier side by controlling the reactive difference on the rectifier side and the first reactive current upper and lower limits through the first reactive closed-loop.

[0011] In some embodiments, the method of controlling the inverter side reactive power through the second reactive closed-loop to obtain the inverter side reactive given current includes: obtaining a preset desired inverter side reactive power and a second current limit of the inverter side converter; determining the inverter side reactive difference according to the desired inverter side reactive power and the inverter side reactive power; determining the second reactive current upper and lower limits according to the second current limit and the inverter side active given current; and controlling the inverter side reactive difference and the second reactive current upper and lower limits through the second reactive closed-loop to obtain the inverter side given current.

[0012] In some embodiments, the rectifier side power includes: rectifier side active power and rectifier side reactive power; the inverter side power includes: inverter side active power and inverter side reactive power; the determining of the rectifier side power and inverter side power according to the incoming line current and the incoming line voltage includes: determining the reactive power and active power of each electrical phase according to the incoming line current and the incoming line voltage; obtaining the connection mode of the Scott transformer and the three-phase power grid; determining the first electrical phase connected to the rectifier side and the second electrical phase and the third electrical phase connected to the inverter side according to the connection mode; determining the reactive power of the first electrical phase as the rectifier side reactive power, and determining the active power of the first electrical phase as the rectifier side active power; determining the inverter side reactive power according to the sum of the reactive power of the second electrical phase and the third electrical phase; determining the inverter side active power according to the arithmetic mean of the sum of the active power of the second electrical phase and the third electrical phase.

[0013] In some embodiments, the co-phase power supply device performs energy management according to the given current on the rectifier side and the given current on the inverter side, including: the co-phase power supply device performs energy management on the rectifier side converter according to the active feedforward current on the rectifier side and the reactive given current on the rectifier side; the co-phase power supply device performs energy management on the inverter side converter according to the active given current on the inverter side and the reactive given current on the inverter side.

[0014] In the second aspect, the present application discloses an energy management device for a same-phase power supply device, comprising: a first acquisition module, used to obtain the incoming current and the incoming voltage of the incoming three-phase power grid of the same-phase power supply device; a first determination module, used to determine the rectifier side power and the inverter side power according to the incoming current and the incoming voltage; a first execution module, used to obtain the rectifier side given current and the inverter side given current through closed-loop control of the inverter side power and the rectifier side power; a second execution module, used for the same-phase power supply device to perform energy management according to the rectifier side given current and the inverter side given current.

[0015] In a third aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any one of the methods described in the first aspect.

[0016] In a fourth aspect, the present application provides a readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of any one of the methods described in the first aspect are implemented.

[0017] In a fifth aspect, the present application provides an energy management system for a same-phase power supply device, characterized in that it includes: a same-phase power supply device and an electronic device as described in the third aspect, wherein the electronic device is connected to the same-phase power supply device.

[0018] Beneficial effects created by the present invention: The present application obtains the incoming current and voltage of the incoming three-phase power grid of the same-phase power supply device; determines the rectifier side power and the inverter side power according to the incoming current and the incoming voltage; obtains the rectifier side given current and the inverter side given current through closed-loop control of the inverter side power and the rectifier side power; the same-phase power supply device performs energy management according to the rectifier side given current and the inverter side given current. The present invention adopts closed-loop control to make the actual output power fully compensate for the negative sequence and reactive power, realize the comprehensive management of negative sequence and reactive power, and achieve precise compensation, realizing negative sequence ≤1% and power factor ≥0.99. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The scope of the present disclosure may be better understood by reading the following detailed description of exemplary embodiments in conjunction with the accompanying drawings. The drawings included are:

[0020] Figure 1 An overall flow chart of an energy management method provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the structure of a same-phase power supply device provided in an embodiment of the present application;

[0022] Figure 3A logic diagram of active closed-loop control with a given feedforward current provided in an embodiment of the present application;

[0023] Figure 4 A logic diagram of a first reactive closed-loop control provided in an embodiment of the present application;

[0024] Figure 5 A logic diagram of a second reactive closed-loop control provided in an embodiment of the present application;

[0025] Figure 6 A schematic diagram of an energy management device for a same-phase power supply device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0027] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0028] If similar descriptions of "first\second\third" appear in the application documents, the following instructions will be added. In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0030] Embodiment 1:

[0031] The control strategy of the existing co-phase power supply device mainly chooses to compensate for the load current, which makes the impedance of the co-phase power supply device and the load impedance coupled with each other, that is, the impedance of the co-phase power supply device will change with the topology of the train and the change of the control method. The existing method has a simple algorithm and is easy to implement. It can control the negative sequence to less than 5% and the power factor to more than 0.95 in real time. However, it only compensates for the negative sequence and reactive power generated by the load on the traction network side, and does not consider the negative sequence and reactive power caused by the co-phase power supply system itself, the Scott transformer, the co-phase power supply device, and the line. If the active and reactive power corresponding to the compensation transformer and line parameters are actively added, the system will be highly dependent on the parameters and not robust. Moreover, each parameter part is a time-varying parameter affected by the environment and working mode, which is difficult to implement in practice.

[0032] In view of the problems existing in the prior art, such as Figure 1 As shown, the present application provides an energy management method for a co-phase power supply device, and the method is applied to an electronic device, and the electronic device can be a server, a mobile terminal, a computer, a cloud platform, etc. The function implemented by the device data processing provided in the embodiment of the present application can be implemented by calling a program code by a processor of the electronic device, wherein the program code can be stored in a computer storage medium, and the energy management method of the co-phase power supply device includes:

[0033] Step S1: Obtain the incoming line current and the incoming line voltage of the incoming three-phase power grid of the same-phase power supply device.

[0034] like Figure 2 As shown, a common co-phase power supply device is connected to a three-phase power grid through a scott transformer. The scott transformer can convert three phases into two phases. Generally speaking, one end of the T seat of the scott transformer is connected to one phase of the three-phase power grid, and the other end is connected to the middle tap of the M seat, while the remaining two phases of the three phases are connected to the two ends of the M seat. Then the secondary side of the T seat of the scott transformer is connected to the high voltage side of the rectifier side transformer through a 27.5kV switch cabinet, and the secondary side of the M seat of the scott transformer is connected to the 27.5kV bus through a 27.5kV switch cabinet. The co-phase power supply device is generally composed of two transformers and a single-phase AC-DC-AC converter, wherein the rectifier side converter phase-locks the switch cabinet 2 voltage, adopts voltage stabilization control, stabilizes the intermediate DC voltage and sets the reactive current, and the inverter side converter phase-locks the switch cabinet 3 voltage, adopts given current control, sets the active current and reactive current, and then the inverter side is connected to the 27.5kV bus through the switch cabinet 3. Moreover, generally, multiple same-phase power supply devices are connected in parallel in the entire same-phase power supply system. In order to make the scheme of the present application easier to understand, a single same-phase power supply device is used as an example. At the same time, in order to facilitate the introduction of the scheme of the present application, the present application is explained in the manner of connecting phase A to the T seat and phase BC to the M seat.

[0035] During the operation of the locomotive, the load of the locomotive does not change stably or linearly. The load of the locomotive will change randomly due to the driving state of the locomotive, the passengers on the car and other needs. The role of the same-phase converter is to adjust the output power in time to meet the load demand of the locomotive when the load of the locomotive changes. However, negative sequence and reactive power will inevitably be generated during the output process. The existence of negative sequence and reactive power will cause power loss and pollute the power grid. Therefore, how to reduce negative sequence and reactive power, and improve the power factor at the same time to reduce the ineffective loss of power is the main research direction. The current existing technology can only control the negative sequence at 5% and the power factor at 0.95. However, such a result will still result in considerable power loss and affect the power supply quality of the power grid. In order to further reduce the negative sequence and improve the power factor, the application needs to first determine the given current of the same-phase power supply device at each moment. In order to determine the given current, it is necessary to first obtain the incoming line current and incoming line voltage of the three-phase power grid input to the scott transformer at this time.

[0036] Step S2: determining the rectifier-side power and the inverter-side power according to the incoming line current and the incoming line voltage.

[0037] In some embodiments, step S2 “determine the rectifier side power and the inverter side power according to the incoming line current and the incoming line voltage” includes:

[0038] Step S21: Determine the reactive power and active power of each electrical phase according to the incoming line current and the incoming line voltage.

[0039] Step S22: obtaining the connection mode between the Scott transformer and the three-phase power grid.

[0040] Step S23: determining the first electrical phase connected to the rectifier side and the second electrical phase and the third electrical phase connected to the inverter side of the same-phase power supply device according to the connection mode.

[0041] Step S24: Determine the reactive power of the first electrical phase as the rectifier-side reactive power, and determine the active power of the first electrical phase as the rectifier-side active power.

[0042] Step S25: Determine the inverter-side reactive power according to the sum of the reactive powers of the second electrical phase and the third electrical phase.

[0043] Step S26: Determine the inverter-side active power according to the arithmetic mean of the sum of the active power of the second electrical phase and the third electrical phase.

[0044] The power on the rectifier side includes: active power on the rectifier side and reactive power on the rectifier side. Similarly, the power on the inverter side includes: active power on the inverter side and reactive power on the inverter side. Since the connection methods of each phase may be different in the actual process, when determining the reactive power and active power on the rectifier side and the active power and reactive power on the inverter side, it is necessary to determine the connection method first, and determine the various powers on the rectifier side and the inverter side according to the connection method.

[0045] Since the present application takes the connection of phase A to T seat and phase BC to M seat as an example, the connection method in the present application is: phase A is connected to T seat, phase B and phase C are connected to M seat, so the first electrical phase connected to the rectifier side is phase A, and the active power and reactive power of the rectifier side at this time are the active power and reactive power of phase A. Therefore, the second electrical phase is phase B, and the third electrical phase is phase C. At this time, the active power of the inverter side is the arithmetic mean of the sum of the active power of phase B and the active power of phase C, and its mathematical expression is as follows:

[0046] Inverter side active power = (Pb + Pc) / 2, where Pb is the active power of phase B, and Pc is the active power of phase C.

[0047] Similarly, the reactive power on the inverter side is the sum of the reactive power of phase B and phase C, and the expression is as follows:

[0048] Inverter side reactive power = Qb + Qc, where Qb is the reactive power of phase B and Qc is the reactive power of phase C.

[0049] Step S3: The inverter side power and the rectifier side power are controlled through closed loop to obtain a rectifier side given current and an inverter side given current.

[0050] The closed-loop control of the present application includes: active closed-loop control, first reactive closed-loop control and second reactive closed-loop control. Since the active power values ​​of the inverter-side converter and the rectifier-side converter are equal, an active closed-loop control can be used, and the reactive power of the rectifier side and the inverter side are not equal, so the first closed-loop control is used to determine the reactive given current of the rectifier side in the present application, and the second closed-loop control is used to determine the reactive given current of the inverter side.

[0051] In some embodiments, step S3 "obtaining a rectifier-side given current and an inverter-side given current by closed-loop control of the inverter-side power and the rectifier-side power" includes:

[0052] Step S31: the rectifier-side active power and the inverter-side active power are controlled through the active closed-loop control to obtain the rectifier-side active feedforward current and the inverter-side active given current.

[0053] In some embodiments, step S31 "obtaining a rectifier side active feedforward current and an inverter side active given current through the active closed-loop control of the rectifier side active power and the inverter side active power" includes:

[0054] Step S311: determining an active power difference according to the rectifier-side active power and the inverter-side active power.

[0055] Step S312: obtaining the transferred active current by controlling the active power difference through the active power closed-loop control.

[0056] Step S313: determining the rectifier-side active feedforward current and the inverter-side active given current according to the transferred active current.

[0057] When the transferred active current is obtained through active closed-loop control, PI control can be performed with the active difference being 0, and the PI controller outputs the transferred active current. The active given current on the inverter side is the transferred active current itself, and the active feedforward current on the rectifier side is the negative value of the transferred active current.

[0058] In some embodiments, in order to speed up the response speed of active closed-loop control, active current feedforward can be added to the PI link. The active closed-loop control with active current feedforward is as follows: Figure 3 In the figure, Pa is the active power of phase A, Pb is the active power of phase B, Pc is the active power of phase C, and Id_Fdf is the active current feedforward.

[0059] Step S32: The rectifier-side reactive power is controlled by the first reactive closed-loop control to obtain a rectifier-side reactive given current.

[0060] In some embodiments, step S32 of "obtaining a rectifier-side reactive given current through the first reactive closed-loop control of the rectifier-side reactive power" includes:

[0061] Step S321: Obtain a preset desired reactive power on the rectifier side and a first current limit value of the rectifier side converter.

[0062] The purpose of this application is to improve the power factor and reduce the negative sequence, so the reactive power on the rectifier side is expected to be 0. However, since the converter itself has a maximum rated current, when it is desired to output active power first, it is necessary to limit the range of the reactive given current of the reactive power, so it is necessary to obtain the first current limit value of the rectifier-side converter.

[0063] Step S322: determining a rectifier-side reactive power difference according to the rectifier-side expected reactive power and the rectifier-side reactive power.

[0064] Step S323: determining first reactive current upper and lower limits according to the first current limit value and the rectifier-side active feedforward current.

[0065] Step S324: the rectifier-side reactive difference and the first reactive current upper and lower limits are controlled by the first reactive closed-loop control to obtain the rectifier-side reactive given current.

[0066] Since the present application wants the reactive power to be as small as possible and wants the reactive power on the rectifier side to be as close to the expected value as possible, it is necessary to know the difference between the expected value and the actual value, that is, the reactive difference on the rectifier side. After the reactive difference on the rectifier side is obtained, during the first reactive closed-loop control, the reactive difference on the rectifier side is brought closer to 0, so that the reactive power on the rectifier side is as close to the expected value as possible.

[0067] Since the converter has a current limit, and the present application needs to ensure active power output, it is necessary to determine the first reactive current upper and lower limits according to the active given current and the first current limit, wherein the mathematical expressions of the first reactive current upper and lower limits are as follows:

[0068]

[0069] In the formula, I lim is the first current limit, Iq_max is the first reactive current upper limit, Iq_min is the first reactive current lower limit, and Id_ref is the transferred active current.

[0070] Therefore, in this application, the control diagram of the reactive given current on the rectifier side is obtained by the first reactive control as follows: Figure 4 In the figure, Iq1_ref is the reactive given current on the rectifier side, and Qa is the reactive power of phase A, i.e. the reactive power on the rectifier side.

[0071] Step S33: the inverter-side reactive power is controlled through the second reactive closed-loop control to obtain an inverter-side reactive given current.

[0072] In some embodiments, step S33 "controlling the inverter-side reactive power through the second reactive closed-loop control to obtain the inverter-side reactive given current" includes:

[0073] Step S331: Obtain the preset inverter-side expected reactive power and the second current limit value of the inverter-side converter.

[0074] Step S332: Determine the inverter side reactive power difference according to the inverter side expected reactive power and the inverter side reactive power.

[0075] Step S333: determining the second reactive current upper and lower limits according to the second current limit value and the inverter-side active given current.

[0076] Step S334: the inverter-side reactive difference and the second reactive current upper and lower limits are controlled through the second reactive closed-loop control to obtain the inverter-side given current.

[0077] In general, the inverter-side converter and rectifier-side converter used in the same-phase power supply device have the same specifications, so the second current limit is the same as the first current limit. Since the active feedforward current on the rectifier side is the same as the active given current on the inverter side, the second reactive current upper and lower limits are the same as the first reactive current upper and lower limits. Therefore, the closed-loop control diagram for calculating the given current on the inverter side is as follows: Figure 5 As shown in the figure, Iq2_ref is the reactive given current on the inverter side, Qb is the reactive power of phase B, Qc is the reactive power of phase C, and Qb+Qc is the reactive power on the inverter side.

[0078] Step S4: the same-phase power supply device performs energy management according to the given current on the rectifier side and the given current on the inverter side.

[0079] In some embodiments, step S4 “the same-phase power supply device performs energy management according to the given current on the rectifier side and the given current on the inverter side” includes:

[0080] Step S41: the same-phase power supply device performs energy management on the rectifier-side converter according to the rectifier-side active feedforward current and the rectifier-side reactive given current.

[0081] Step S42: the same-phase power supply device performs energy management on the inverter-side converter according to the inverter-side active given current and the inverter-side reactive given current.

[0082] The same-phase power supply device can control the output power of the inverter-side converter and the rectifier-side converter according to the corresponding given current, thereby achieving the purpose of energy management according to the given current.

[0083] This application adopts active closed-loop and reactive closed-loop PI control to make the actual output power fully compensate for the negative sequence and reactive power, realize the comprehensive management of negative sequence and reactive power, and achieve precise compensation, realizing negative sequence ≤1% and power factor ≥0.99.

[0084] Embodiment 2:

[0085] Based on the foregoing embodiments, an embodiment of the present application provides an energy management device for a co-phase power supply device. The modules included in the device and the units included in each module can be implemented by a processor in a computer device; of course, they can also be implemented by a specific logic circuit; in the implementation process, the processor can be a central processing unit (CPU, Central Processing Unit), a microprocessor (MPU, Microprocessor Unit), a digital signal processor (DSP, Digital Signal Processing) or a field programmable gate array (FPGA, Field Programmable Gate Array), etc.

[0086] like Figure 6 As shown, an energy management device for a same-phase power supply device includes: a first acquisition module, a first determination module, a first execution module and a second execution module.

[0087] The first acquisition module 1 is used to obtain the incoming current and the incoming voltage of the incoming three-phase power grid of the same-phase power supply device. The first determination module 2 is used to determine the rectifier side power and the inverter side power according to the incoming current and the incoming voltage. The first execution module 3 is used to obtain the rectifier side given current and the inverter side given current through closed-loop control of the inverter side power and the rectifier side power. The second execution module 4 is used for the same-phase power supply device to perform energy management according to the rectifier side given current and the inverter side given current.

[0088] Each module in the energy management device of the above-mentioned same-phase power supply device can be fully or partially implemented by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the device in the form of hardware, or can be stored in the memory in the processing device in the form of software, so that the processor can call and execute the operations corresponding to the above modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0089] Embodiment 3:

[0090] In a third aspect, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any one of the methods described in the first aspect.

[0091] Embodiment 4:

[0092] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect.

[0093] Embodiment 5:

[0094] In a fifth aspect, the present application provides an energy management system for a same-phase power supply device, comprising: a same-phase power supply device and an electronic device as described in the third aspect, wherein the electronic device is connected to the same-phase power supply device.

[0095] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0096] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above-mentioned sequence numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments.

[0097] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article 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 process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0098] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0099] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units. They may be located in one place or distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0100] In addition, all functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit. The above integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0101] Those skilled in the art can understand that all or part of the steps of the above method embodiments can be completed by hardware related to program instructions, and the above program can be stored in a computer-readable storage medium, and when the program is executed, the steps of the above method embodiments are executed. The above storage medium includes: a mobile storage device, a read-only memory (ROM), a magnetic disk or an optical disk, and other media that can store program codes.

[0102] Alternatively, if the above-mentioned integrated unit of the present application is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application can essentially or in other words, the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for a controller to execute all or part of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0103] The above is only an implementation method of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An energy management method for a same-phase power supply device, characterized in that: include: Obtain the incoming line current and the incoming line voltage of the incoming three-phase power grid of the same-phase power supply device; Determine the rectifier side power and the inverter side power according to the incoming line current and the incoming line voltage; The inverter side power and the rectifier side power are controlled by closed loop to obtain a rectifier side given current and an inverter side given current; The same-phase power supply device performs energy management according to the given current on the rectifier side and the given current on the inverter side.

2. The method according to claim 1, characterized in that The rectifier side power includes: rectifier side reactive power and rectifier side active power; the closed-loop control includes: active closed-loop control, first reactive closed-loop control and second reactive closed-loop control; the inverter side power includes: inverter side reactive power and inverter side active power; the inverter side power and the rectifier side power are controlled through closed loop to obtain a rectifier side given current and an inverter side given current: The active power on the rectifier side and the active power on the inverter side are controlled by the active closed loop to obtain the active feedforward current on the rectifier side and the active given current on the inverter side; The rectifier-side reactive power is controlled by the first reactive closed-loop control to obtain a rectifier-side reactive given current; The inverter side reactive power is controlled through the second reactive closed-loop control to obtain the inverter side reactive given current.

3. The method according to claim 2, characterized in that The step of controlling the rectifier-side active power and the inverter-side active power through the active closed-loop control to obtain the rectifier-side active feedforward current and the inverter-side active given current comprises: Determine an active power difference according to the rectifier side active power and the inverter side active power; The active power difference is controlled by the active power closed loop to obtain the transferred active power current; The active feedforward current on the rectifier side and the active given current on the inverter side are determined according to the transferred active current.

4. The method according to claim 3, characterized in that The step of controlling the reactive power on the rectifier side through the first reactive closed-loop control to obtain a given reactive current on the rectifier side includes: Obtaining a preset rectifier-side expected reactive power and a first current limit value of a rectifier-side converter; Determining a reactive power difference on the rectifier side according to the desired reactive power on the rectifier side and the reactive power on the rectifier side; Determine the first reactive current upper and lower limits according to the first current limit value and the rectifier-side active feedforward current; The rectifier-side reactive difference and the first reactive current upper and lower limits are controlled by the first reactive closed-loop control to obtain the rectifier-side reactive given current.

5. The method according to claim 3, characterized in that: The step of controlling the inverter-side reactive power through the second reactive closed-loop control to obtain the inverter-side reactive given current includes: Obtaining a preset inverter-side expected reactive power and a second current limit value of the inverter-side converter; Determining the inverter side reactive power difference according to the inverter side expected reactive power and the inverter side reactive power; Determine the second reactive current upper and lower limits according to the second current limit value and the inverter-side active given current; The inverter side reactive difference and the second reactive current upper and lower limits are controlled by the second reactive closed-loop control to obtain the inverter side given current.

6. The method according to claim 1, characterized in that The rectifier side power includes: rectifier side active power and rectifier side reactive power; the inverter side power includes: inverter side active power and inverter side reactive power; the determining of the rectifier side power and inverter side power according to the incoming line current and the incoming line voltage includes: Determining reactive power and active power of each electrical phase according to the incoming line current and the incoming line voltage; Obtaining a connection mode between a Scott transformer and the three-phase power grid; Determine, according to the connection mode, the first electrical phase connected to the rectifier side and the second electrical phase and the third electrical phase connected to the inverter side of the same-phase power supply device; Determine the reactive power of the first electrical phase as the rectifier-side reactive power, and determine the active power of the first electrical phase as the rectifier-side active power; Determine the inverter-side reactive power according to the sum of the reactive powers of the second electrical phase and the third electrical phase; The inverter-side active power is determined according to the arithmetic mean of the sum of the active power of the second electrical phase and the third electrical phase.

7. The method according to claim 2, characterized in that: The same-phase power supply device performs energy management according to the given current on the rectifier side and the given current on the inverter side, including: The in-phase power supply device performs energy management on the rectifier-side converter according to the rectifier-side active feedforward current and the rectifier-side reactive given current; The same-phase power supply device performs energy management on the inverter-side converter according to the inverter-side active given current and the inverter-side reactive given current.

8. An energy management device for a same-phase power supply device, characterized in that: include: A first acquisition module is used to acquire the incoming line current and the incoming line voltage of the incoming three-phase power grid of the same-phase power supply device; A first determination module, used to determine the rectifier side power and the inverter side power according to the incoming line current and the incoming line voltage; A first execution module, used for obtaining a rectifier-side given current and an inverter-side given current by controlling the inverter-side power and the rectifier-side power through a closed loop; The second execution module is used for the same-phase power supply device to perform energy management according to the given current on the rectifier side and the given current on the inverter side.

9. An electronic device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 7.

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

11. An energy management system for a same-phase power supply device, characterized in that: include: A same-phase power supply device and the electronic device as claimed in claim 9, wherein the electronic device is connected to the same-phase power supply device.

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