CN115800332A

CN115800332A - Load adjusting method and system

Info

Publication number: CN115800332A
Application number: CN202310024086.0A
Authority: CN
Inventors: 王利强; 范杨平
Original assignee: Xian Linchr New Energy Technology Co Ltd
Current assignee: Xian Linchr New Energy Technology Co Ltd
Priority date: 2023-01-09
Filing date: 2023-01-09
Publication date: 2023-03-14
Anticipated expiration: 2043-01-09
Also published as: CN115800332B

Abstract

The application provides a load adjusting method and system, and relates to the technical field of power electronics. The method comprises the steps of obtaining power current of each phase in three phases corresponding to a preset alternating current bus, respectively calculating current regulating quantity of each phase according to the power current of each phase, respectively determining target current regulating quantity of each phase of each three-phase transformation device in at least one three-phase transformation device to be dispatched according to the current regulating quantity of each phase, and sending the target current regulating quantity of each phase to each three-phase transformation device, so that each three-phase transformation device respectively regulates loads of each phase on the preset alternating current bus according to the target current regulating quantity of each phase, electric energy transfer among phase lines is realized, load balance of the three phases is guaranteed, and normal power consumption requirements do not need to be restrained.

Description

Load adjusting method and system

Technical Field

The application relates to the technical field of power electronics, in particular to a load adjusting method and system.

Background

Along with the continuous popularization of electric vehicles, the charging power demand is larger and larger, and the demand in industrial parks or communities is more obvious. The charging power is high, and the charging time period of the charging equipment is overlapped with the residential electricity time period, so that the charging equipment and the residential electricity equipment compete for charges of the power grid, wherein one phase or two phases of the three-phase power grid can generate load pressure due to a three-phase load and a single-phase load in the equipment.

In the prior art, in order to relieve the load pressure of a phase line, three-phase loads and single-phase loads can be charged in different time periods, a priority order is set, the power of the load on the phase line generating the load pressure can be reduced, and the normal electricity utilization power of the load is recovered when the load pressure is low.

Disclosure of Invention

The present invention provides a load adjustment method and system to solve the problem of the prior art that the load adjustment needs to suppress the normal power consumption.

In order to achieve the above purpose, the technical solutions adopted in the embodiments of the present application are as follows:

in a first aspect, an embodiment of the present application provides a load adjustment method, where the method includes:

acquiring power current of each phase in three phases corresponding to a preset alternating current bus;

respectively calculating the current regulating quantity of each phase according to the power current of each phase;

respectively determining the target current regulating quantity of each three-phase transformation device in at least one three-phase transformation device to be scheduled in each phase according to the current regulating quantity of each phase;

and sending the target current regulation quantity of each phase to each three-phase transformation device, so that each three-phase transformation device respectively regulates the load of each phase on the preset alternating current bus according to the target current regulation quantity of each phase.

Optionally, the power current comprises: the method comprises the steps of calculating the current regulation quantity of each phase according to the power current of each phase, wherein the current regulation quantity comprises the following steps:

respectively calculating the active current regulating quantity of each phase according to the active current of each phase;

respectively determining the reactive current regulating quantity of each phase according to the reactive current of each phase;

the determining, according to the current adjustment amount of each phase, a target current adjustment amount of each three-phase transformation device in at least one three-phase transformation device to be scheduled in each phase includes:

respectively determining the target active current regulating quantity of each phase of each three-phase transformation device in at least one three-phase transformation device to be scheduled according to the active current regulating quantity of each phase;

determining the target reactive current regulating quantity of each three-phase conversion device in each phase according to the reactive current regulating quantity of each phase;

the sending the target current adjustment amount of each phase to each three-phase conversion device includes:

and sending the target active current regulating quantity and the target reactive current regulating quantity of each phase to each three-phase conversion device.

Optionally, if the number of the three-phase conversion devices is at least one, respectively determining a target active current adjustment amount of each three-phase conversion device in the at least one three-phase conversion device to be scheduled in each phase according to the active current adjustment amount of each phase, including:

respectively determining an active scheduling coefficient corresponding to each three-phase conversion device according to the schedulable active capacity of at least one three-phase conversion device;

and respectively determining the target active current regulating quantity of each three-phase transformation device in each phase according to the active current regulating quantity of each phase and the active scheduling coefficient corresponding to each three-phase transformation device in the at least one three-phase transformation device.

Optionally, if the number of the three-phase transformation devices is at least one, the determining the target reactive current adjustment amount of each three-phase transformation device in each phase according to the reactive current adjustment amount of each phase includes:

respectively determining a reactive power dispatching coefficient corresponding to each three-phase conversion device according to the dispatching reactive power capacity of at least one three-phase conversion device;

and respectively determining the target reactive current regulating quantity of each three-phase transformation device in each phase according to the reactive current regulating quantity of each phase and the reactive scheduling coefficient corresponding to each three-phase transformation device.

Optionally, the active current of each phase is the active current of each phase on the power grid side; the calculating the active current regulating quantity of each phase according to the active current of each phase includes:

calculating a first average active current according to the active current of each phase;

and respectively calculating the active current regulating quantity of each phase by adopting a preset active current loop control algorithm according to the first average active current and the active current of each phase.

Optionally, the reactive current of each phase is a reactive current of each phase on the grid side; the determining the reactive current regulating quantity of each phase according to the reactive current of each phase comprises:

and respectively calculating the reactive current regulating quantity of each phase by adopting a preset reactive current loop control algorithm according to the reactive current of each phase and a preset reference reactive current value.

Optionally, the active current of each phase is the active current of each phase on the load side; the calculating the active current regulating quantity of each phase according to the active current of each phase includes:

calculating a second average active current according to the active current of each phase;

and obtaining the active current regulating quantity of each phase according to the difference value of the active current of each phase and the second average active current.

Optionally, the reactive current of each phase is a reactive current of each phase on a load side; the determining the reactive current regulating quantity of each phase according to the reactive current of each phase comprises:

and determining the reactive current of each phase as the reactive current regulating quantity of each phase.

Optionally, the obtaining power current of each phase in the three phases corresponding to the preset alternating current bus includes:

detecting the three-phase current and the three-phase voltage corresponding to the preset alternating current bus;

and respectively determining the active current of each phase and the reactive current of each phase according to the current of the three phases and the voltage of the three phases.

Optionally, the obtaining of the power current of each phase in the three phases corresponding to the preset ac bus includes:

acquiring power and power factor information of each three-phase conversion device;

and determining the active current of each phase and the reactive current of each phase according to the power of each three-phase conversion device, the power factor information of each three-phase conversion device and the voltage of a preset alternating current power supply.

In a second aspect, an embodiment of the present application provides a load adjustment system, including: the device comprises a transformer, at least one three-phase conversion device, a control device and a load;

the transformer is used for being electrically connected with a preset alternating current bus, the at least one three-phase transformation device is used for being electrically connected with the preset alternating current bus, the load is used for being electrically connected with the preset alternating current bus, the control device is in communication connection with the control unit of each three-phase transformation device, the control device is electrically connected with the outgoing line of the transformer, the control device is further electrically connected with the incoming line of the load, and the control device is used for executing the load adjusting method of the first aspect.

Compared with the prior art, the method has the following beneficial effects:

the load adjusting method and system provided by the application can be used for obtaining the power current of each phase in the three phases corresponding to the preset alternating current bus, respectively calculating the current adjusting quantity of each phase according to the power current of each phase, respectively determining the target current adjusting quantity of each phase of each three-phase transformation equipment in at least one three-phase transformation equipment to be scheduled according to the current adjusting quantity of each phase, and sending the target current adjusting quantity of each phase to each three-phase transformation equipment, so that each three-phase transformation equipment respectively adjusts the load of each phase on the preset alternating current bus according to the target current adjusting quantity of each phase, electric energy transfer between the phase lines is realized, the load balance of the three phases is ensured, and normal power consumption requirements are not required to be inhibited.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a load adjustment system according to an embodiment of the present application;

fig. 2 is a schematic flowchart of a load adjustment method according to an embodiment of the present application;

fig. 3 is a schematic flowchart of another load adjustment method provided in the embodiment of the present application;

fig. 4 is a schematic flowchart of another load adjustment method provided in the embodiment of the present application;

fig. 5 is a schematic flow chart of another load adjustment method provided in the embodiment of the present application;

fig. 6 is a schematic flowchart of another load adjustment method provided in the embodiment of the present application;

fig. 7 is a schematic flowchart of another load adjustment method provided in the embodiment of the present application;

fig. 8 is a schematic flowchart of another load adjustment method provided in the embodiment of the present application;

fig. 9 is a schematic flowchart of another load adjustment method provided in the embodiment of the present application;

FIG. 10 is a schematic view of a load adjustment apparatus provided in accordance with an embodiment of the present application;

fig. 11 is a schematic diagram of a control device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present invention, the terms "first", "second", and the like, if any, are used only for distinguishing the description, and are not intended to indicate or imply relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

After the transformer is fed with wire, a plurality of loads are connected to the three-phase four-wire, and the three-phase load can be divided into a single-phase load for taking power in a single phase and a three-phase load for taking power in a three-phase manner according to the power taking mode of the loads. In a single-phase power taking mode, such as residential power utilization or charging of a charging pile, any single-phase load can be connected to one of any three phases and a zero line, and the load is flexible and changeable, so that even if all three-phase loads meet the total power load amount, the load currents of the corresponding three phases are generally different, namely the charges in the three phases are uneven and unbalanced; the three-phase power taking method, such as a three-phase load, generally controls three-phase currents to be symmetrical and equal, but the three-phase currents may not be equal, so that the electric charges in the three phases may be unbalanced. When single-phase load and three-phase load exist on the three-phase four-wire, the charge in the three phases is unbalanced as a whole.

In the prior art, load regulation in three phases is performed by setting a priority order of loads and limiting power consumption, which are both used for suppressing a normal power consumption demand, and in order to regulate three-phase loads to balance charges in the three phases on the basis of not suppressing the normal power consumption demand, in the scheme of the application, a load regulation system is provided, and a load regulation system provided in the embodiment of the application is explained by using specific examples as follows. Fig. 1 is a schematic structural diagram of a load adjustment system according to an embodiment of the present application. As shown in fig. 1, the system includes: transformer 100, at least one three-phase transformation device 300, control means 400, load 500.

The transformer 100 is used to electrically connect the preset ac bus 200, and the transformer 100 can transmit current and voltage to the preset ac bus 200, where the preset ac bus 200 is a three-phase four-wire, and the last wire is a zero wire.

The load 500 is used for electrically connecting the preset alternating current bus 200, and the load 500 is provided with electric energy through the preset alternating current bus 200, so that the load 500 can work normally. All loads 500 may be divided into a-phase load (load a in fig. 1), B-phase load (load B in fig. 1), and C-phase load (load C in fig. 1) from a three-phase perspective, and the total current of the loads 500 may be divided into IAL, IBL, and ICL.

The at least one three-phase transformation device 300 is used for electrically connecting the preset alternating current bus 200, and the at least one three-phase transformation device 300 can transfer the electric energy of the phase line with less load to the phase line with heavier load when the load phase difference of the three phases is larger under the condition of meeting the total load requirement, so that the electric energy transfer and the load balance among the phase lines are realized, and the three phases are always in the load balance state.

At least one of the three-phase transforming devices 300 is a composite charging device distributed in each geographical area and capable of operating independently, and may be charged or discharged, and may be discharged into three-phase lines, or into a device to be charged connected to the three-phase transforming device 300. Each three-phase transformation device 300 has the capability of independently adjusting reactive and active power, and can be normally charged or discharged.

Alternatively, the at least one three-phase transformation device 300 may be a charging pile or the like.

Optionally, each three-phase transformation device 300 needs to reserve capacity for energy transfer and reactive current regulation between three phases on the basis of the original power balance, so that three-phase incoming current can ensure the condition that the load balance and reactive power of the three phases are approximately 0.

For example, the three-phase conversion device 300 may be a three-phase four-wire AC/DC topology structure, such as a three-phase four-leg, a three-phase split capacitor midpoint, and the like, and may be used as a topology scheme of the three-phase conversion device 300, and of course, other devices having the capability of independently adjusting reactive power and active power may also be used, and are not particularly limited in the embodiment of the present application.

After the n three-phase inverter devices 300 are input, the currents of the three-phase inverter devices 300 may be IA1, IB1, IC1 to IAn, IBn, ICn, respectively. In this embodiment, when the sum of the currents of the three-phase transformation device 300 and the current of the load is approximately the same in real time and the reactive components are offset, the active current and the reactive current of the three phases of the three-phase incoming line current are balanced and approximately equal to 0.

The control apparatus 400 is communicatively connected to each of the three-phase transformation devices 300, and specifically, the control apparatus 400 is communicatively connected to the control unit of each of the three-phase transformation devices 300, so that the control unit of the control apparatus 400 can send a control instruction to each of the three-phase transformation devices 300, so that each of the three-phase transformation devices 300 can perform current regulation of each of the three phases according to the control instruction, and specifically, regulation of active current and reactive current of each of the phases, thereby achieving power transfer and load balancing between the phases.

The control device 400 is electrically connected to the outgoing line of the transformer 100, and the control device 400 is further electrically connected to the incoming line of the load 500, so as to calculate a current regulation amount of the three-phase converter 300 according to a current at the outgoing line of the transformer 100, specifically, an active current and a reactive current regulation amount, or calculate a current regulation amount of the three-phase converter 300 according to a current at the incoming line of the load 500, and further control the three-phase converter 300 according to the regulation amount to realize electric energy transfer and load balance.

Alternatively, the control device 400 may be connected to the outgoing line of the transformer 100 through a current sensor to detect and obtain the current at the outgoing line of the transformer 100, and the control device 400 may be connected to the incoming line of the load 500 through a current sensor to detect and obtain the current at the incoming line of the load 500.

The application provides a load regulation system, includes: the transformer, at least one three-phase transformation equipment, a control device and a load, wherein the transformer is used for electrically connecting a preset alternating current bus, the at least one three-phase transformation equipment is used for electrically connecting the preset alternating current bus, the load is used for electrically connecting the preset alternating current bus, the control device is in communication connection with a control unit of each three-phase transformation equipment, the control device is electrically connected with an outgoing line of the transformer, the control device is also electrically connected with an incoming line of the load, and the control device is used for controlling the three-phase transformation equipment to carry out current regulation of each phase in the three phases according to collected current information.

On the basis of the embodiment of the load regulation system described in fig. 1, in order to achieve power transfer and load balancing between the phase lines, in the solution of the present application, a load regulation method is provided, and a load regulation method provided by the embodiment of the present application is explained by using a specific example as follows. Fig. 2 is a schematic flowchart of a load adjustment method according to an embodiment of the present application. As shown in fig. 2, the method includes:

s201, obtaining power current of each phase in three phases corresponding to a preset alternating current bus.

Because three phases in the preset alternating current bus need to be adjusted, the power current of each phase in the three phases corresponding to the preset alternating current bus needs to be acquired at first, and the adjustment amount is determined according to the acquired current power current, and then the adjustment can be performed through the three-phase conversion equipment.

S202, calculating the current adjustment amount of each phase according to the power current of each phase.

When the power currents of the three phases corresponding to the preset alternating current bus are unbalanced, the power currents of the phases need to be adjusted respectively, so that the current adjustment quantity of each phase can be calculated respectively according to the power currents of the phases, and the power currents of the three phases can be adjusted according to the current adjustment quantity of each phase through the three-phase conversion equipment.

S203, respectively determining the target current regulating quantity of each three-phase transformation device in at least one three-phase transformation device to be scheduled in each phase according to the current regulating quantity of each phase.

The load adjusting system comprises at least one three-phase transformation device, and the three-phase transformation device is inquired through communication or uploads the running state (receiving scheduling or not receiving scheduling) of each three-phase transformation device in real time to determine the at least one three-phase transformation device which can receive scheduling. The three-phase converter system which can be subjected to scheduling can be understood as a three-phase converter system which can be subjected to load regulation.

And if the number of the three-phase transformation equipment to be scheduled is one, the current regulating quantity of each phase is the target current regulating quantity of the three-phase transformation equipment in each phase. That is, the current adjustment amount is distributed to the one three-phase conversion device by one hundred percent, and if the adjustment requirement is greater than the adjustment capability of the one three-phase conversion device, the adjustment is performed according to the adjustment capability of the one three-phase conversion device.

If the number of the three-phase transformation devices to be scheduled is multiple, a target current adjustment amount of each three-phase transformation device in the multiple three-phase transformation devices needs to be determined according to the current adjustment amount of each phase, so that load adjustment is performed through the multiple three-phase transformation devices together.

And S204, sending the target current regulating quantity of each phase to each three-phase conversion device, so that each three-phase conversion device respectively regulates the load of each phase on the preset alternating current bus according to the target current regulating quantity of each phase.

And after each three-phase transformation device receives the target current adjustment quantity, each three-phase transformation device respectively adjusts the load of each phase on the preset alternating current bus according to the target current adjustment quantity of each phase.

Specifically, each three-phase conversion device adds the adjustment amount to the original power consumption according to the target current adjustment amount of each phase, so that the magnitude of the output current or the received current of the three phases corresponding to the preset alternating current bus by each three-phase conversion device can be determined.

Optionally, the state of each three-phase transformation device is processed according to the following principle according to the respective setting and the actual state: if the total current or apparent power converted by adding the regulating quantity to the current operation capacity of a certain three-phase conversion device is less than or equal to the total capacity of the three-phase conversion device, the regulating quantity is directly added on the basis of the original operation. If the total current or apparent power converted by adding the regulating quantity to the current operation capacity of a certain three-phase conversion device is larger than or equal to the total capacity, the regulating quantity is preferentially met, and the rest part except the regulating quantity in the total capacity is the power utilization capacity of the three-phase conversion device. That is, the present operating capacity may be sacrificed when adjusting the load according to the amount of current adjustment, such as sacrificing the charging power requirements of the three-phase transformation device.

Optionally, if the scheduling capacity of all currently operating three-phase transformation devices is smaller than the adjustment amount for adjusting the three-phase imbalance, when the three-phase imbalance reaches the warning threshold, the active current is forcibly limited, and the load constraint principle is executed.

Optionally, the current of one phase of the three phases corresponding to the preset alternating-current bus may also be obtained, the target current regulating quantity of the one phase is obtained through calculation, and each three-phase transformation device adjusts the load of each phase on the preset alternating-current bus according to the target current regulating quantity of the one phase. In the adjustment, the target current adjustment amount for each phase is the same, and may be the target current adjustment amount for the phase.

The load adjusting method includes the steps of obtaining power currents of all phases in three phases corresponding to a preset alternating current bus, calculating current adjustment quantities of all phases according to the power currents of all phases, determining target current adjustment quantities of all three-phase transformation equipment in at least one to-be-scheduled three-phase transformation equipment according to the current adjustment quantities of all phases, and sending the target current adjustment quantities of all phases to all three-phase transformation equipment, so that each three-phase transformation equipment respectively adjusts loads of all phases on the preset alternating current bus according to the target current adjustment quantities of all phases, electric energy transfer between phase lines is achieved, load balance of the three phases is guaranteed, and normal power consumption requirements do not need to be restrained.

On the basis of the load adjustment method shown in fig. 2, the embodiment of the present application further provides another load adjustment method. Optionally, fig. 3 is a schematic flow chart of another load adjustment method provided in the embodiment of the present application, and as shown in fig. 3, the power current includes: active current, which is the current generated by the operation of a load, and reactive current, which depends on the load characteristics or the control performance of the three-phase transformation device. When a phase difference occurs between the sinusoidal current and the sinusoidal voltage, a sin value corresponding to the phase difference is a reactive component, and a cos value corresponding to the phase difference is an active component.

The active current and the reactive current of each phase in the three phases corresponding to the preset alternating current bus may be the current on the incoming line side or the outgoing line side of the preset alternating current bus, and the like.

The method S202, which calculates the current adjustment amount of each phase according to the power current of each phase, includes:

and S301, respectively calculating the active current regulating quantity of each phase according to the active current of each phase.

Specifically, according to the active currents of the three phases (phase a, phase B, and phase C) and the active current of the phase a, the active current adjustment amount of the phase a can be calculated, that is, the active adjustment of the phase a in the preset ac bus is required.

According to the active current of the three phases (phase A, phase B and phase C) and the active current of the phase B, the active current regulating quantity of the phase B can be calculated, namely the active regulation of the phase B in the preset alternating current bus is required.

According to the active current of the three phases (phase A, phase B and phase C) and the active current of the phase C, the active current regulating quantity of the phase C can be calculated, namely the active regulation of the phase C in the preset alternating current bus is required.

And S302, respectively determining reactive current regulating quantity of each phase according to the reactive current of each phase.

The reactive current regulating quantity of the phase A can be determined according to the reactive current of the phase A, namely the reactive regulation of the phase A in a preset alternating current bus is needed.

And determining the reactive current regulating quantity of the B phase according to the reactive current of the B phase, namely the reactive regulation of the B phase line in the preset alternating current bus is required.

And determining the reactive current regulating quantity of the C phase according to the reactive current of the C phase, namely the reactive regulation of the C phase line in the preset alternating current bus is required.

The method S203, respectively determining a target current adjustment amount of each three-phase transformation device in at least one three-phase transformation device to be scheduled in each phase according to the current adjustment amount of each phase, includes:

and S303, respectively determining a target active current regulating quantity of each phase of each three-phase conversion device in at least one three-phase conversion device to be scheduled according to the active current regulating quantity of each phase.

The at least one three-phase transformation device performs active regulation on three phases in a preset alternating current bus together, so that a target active current regulation quantity of each three-phase transformation device in the at least one three-phase transformation device to be scheduled in each phase needs to be determined according to the active current regulation quantity.

And if the number of the three-phase conversion equipment to be scheduled is one, the active current regulating quantity of each phase is the target active current regulating quantity of the three-phase conversion equipment in each phase. That is, the active current regulating quantity is distributed to the three-phase conversion equipment in percentage, and if the active regulation requirement is greater than the regulation capacity of the three-phase conversion equipment, the regulation is performed according to the regulation capacity of the three-phase conversion equipment.

And S304, determining the target reactive current regulating quantity of each three-phase conversion device in each phase according to the reactive current regulating quantity of each phase.

The at least one three-phase conversion device also commonly performs reactive power regulation on three phases in the preset alternating current bus, so that the target reactive current regulation quantity of each three-phase conversion device in the at least one three-phase conversion device to be scheduled in each phase needs to be determined according to the reactive current regulation quantity.

And if the number of the three-phase transformation equipment to be scheduled is one, the reactive current regulating quantity of each phase is the target reactive current regulating quantity of the three-phase transformation equipment in each phase. That is, the reactive current regulating quantity is distributed to the three-phase conversion equipment in percentage, and if the reactive power regulating requirement is greater than the regulating capacity of the three-phase conversion equipment, the regulation is carried out according to the regulating capacity of the three-phase conversion equipment.

The method S204 of sending the target current adjustment amount of each phase to each three-phase conversion device includes:

and S305, sending the target active current regulating quantity and the target reactive current regulating quantity of each phase to each three-phase conversion device.

After each three-phase conversion device receives the current regulating quantity, each three-phase conversion device respectively regulates the load of each phase on the preset alternating current bus according to the target active current regulating quantity and the target reactive current regulating quantity of each phase.

Optionally, the active current and the reactive current of one phase of the three phases corresponding to the preset alternating-current bus can be obtained, the target active current regulating quantity and the target reactive current regulating quantity of the one phase are obtained through calculation, and each three-phase conversion device adjusts the load of each phase on the preset alternating-current bus according to the target active current regulating quantity and the target reactive current regulating quantity of the one phase. During regulation, the target active current regulating quantity and the target reactive current regulating quantity of each phase are the same, and can be the target active current regulating quantity and the target reactive current regulating quantity of the phase.

The load regulation method includes the steps of obtaining active current of each phase and reactive current of each phase in three phases corresponding to a preset alternating current bus, respectively calculating active current regulating quantity of each phase according to the active current of the three phases and the active current of each phase, respectively determining reactive current regulating quantity of each phase according to the reactive current of each phase, respectively determining target active current regulating quantity of each phase of each three-phase conversion device in at least one three-phase conversion device to be scheduled according to the active current regulating quantity of each phase, determining target reactive current regulating quantity of each phase of each three-phase conversion device according to the reactive current regulating quantity of each phase, and sending the target active current regulating quantity and the target reactive current regulating quantity of each phase to each three-phase conversion device, so that each three-phase conversion device respectively regulates loads of each phase on the preset alternating current bus according to the target active current regulating quantity and the target reactive current regulating quantity of each phase, and current regulation of each phase is achieved.

On the basis of the load adjustment method shown in fig. 3, an embodiment of the present application further provides another load adjustment method. Optionally, fig. 4 is a schematic flowchart of another load adjustment method provided by the embodiment of the present application, and as shown in fig. 4, if the number of the three-phase conversion devices is at least one, the method S303 determines, according to the active current adjustment amount of each phase, a target active current adjustment amount of each three-phase conversion device in at least one three-phase conversion device to be scheduled in each phase, respectively, and includes:

s401, respectively determining an active scheduling coefficient corresponding to each three-phase conversion device according to the schedulable active capacity of at least one three-phase conversion device.

The method comprises the steps of obtaining reported schedulable active capacity reported by at least one three-phase transformation device, multiplying the reported schedulable active capacity by a constant less than 1 on the basis of the reported schedulable active capacity to obtain the schedulable active capacity of each three-phase transformation device, and ensuring the reliability of the schedulable active capacity.

And calculating the schedulable total active capacity according to the schedulable active capacity of each three-phase transformation device in the at least one three-phase transformation device, and calculating the active scheduling coefficient of each three-phase transformation device according to the schedulable total active capacity and the schedulable active capacity of each three-phase transformation device.

Specifically, the proportion of the schedulable active capacity of each three-phase transformation device in the schedulable total active capacity (the schedulable active capacity of each three-phase transformation device divided by the schedulable total active capacity) is the active scheduling coefficient of each three-phase transformation device.

If the number of the three-phase transformation equipment is one, the active scheduling coefficient is 1.

And S402, respectively determining the target active current regulating quantity of each three-phase transformation device in each phase according to the active current regulating quantity of each phase and the active scheduling coefficient corresponding to each three-phase transformation device in at least one three-phase transformation device.

Specifically, the active scheduling coefficient corresponding to each three-phase conversion device is multiplied by the active current adjustment amount of each phase, so that the target active current adjustment amount of each three-phase conversion device in each phase can be obtained.

If the number of the three-phase conversion devices is one, the active scheduling coefficient is 1, and at this time, the active current regulating quantity of each phase is the target active current regulating quantity of the three-phase conversion device in each phase.

According to the load adjusting method provided by the embodiment of the application, if the number of the three-phase transformation devices is at least one, according to the schedulable active capacity of at least one of the three-phase transformation devices, the active scheduling coefficient corresponding to each of the three-phase transformation devices is respectively determined, according to the active current adjustment amount of each phase and the active scheduling coefficient corresponding to each of the three-phase transformation devices in at least one of the three-phase transformation devices, the target active current adjustment amount of each of the three-phase transformation devices in each phase is respectively determined, and then each of the three-phase transformation devices can realize active current balance according to the target active current adjustment amount.

On the basis of the load adjustment method shown in fig. 3, an embodiment of the present application further provides another load adjustment method. Optionally, fig. 5 is a schematic flowchart of another load adjustment method provided in this embodiment of the present application, and as shown in fig. 5, if the number of the three-phase converter devices is at least one, the method S304 determines a target reactive current adjustment amount of each three-phase converter device in each phase according to the reactive current adjustment amount of each phase, including:

s501, respectively determining reactive power dispatching coefficients corresponding to the three-phase transformation equipment according to the dispatching reactive power capacity of the at least one three-phase transformation equipment.

And acquiring the reported schedulable reactive capacity reported by at least one three-phase conversion device, multiplying the reported schedulable reactive capacity by a constant less than 1 on the basis of reporting the schedulable reactive capacity to obtain the schedulable reactive capacity of each three-phase conversion device, and ensuring the reliability of the schedulable reactive capacity.

And calculating the schedulable total reactive capacity according to the schedulable reactive capacity of each three-phase transformation device in the at least one three-phase transformation device, and calculating the reactive scheduling coefficient of each three-phase transformation device according to the schedulable total reactive capacity and the schedulable reactive capacity of each three-phase transformation device.

Specifically, the proportion of the schedulable reactive capacity of each three-phase transformation device in the schedulable total reactive capacity (the schedulable reactive capacity of each three-phase transformation device divided by the schedulable total reactive capacity) is the reactive scheduling coefficient of each three-phase transformation device.

And if the number of the three-phase transformation equipment is one, the reactive power scheduling coefficient is 1.

And S502, respectively determining the target reactive current regulating quantity of each three-phase transformation device in each phase according to the reactive current regulating quantity of each phase and the reactive scheduling coefficient corresponding to each three-phase transformation device.

Specifically, the reactive scheduling coefficient corresponding to each three-phase conversion device is multiplied by the reactive current adjustment amount of each phase, so that the target reactive current adjustment amount of each three-phase conversion device in each phase can be obtained.

If the number of the three-phase transformation equipment is one, the reactive scheduling coefficient is 1, and at this time, the reactive current regulating quantity of each phase is the target reactive current regulating quantity of the three-phase transformation equipment in each phase.

According to the load adjusting method provided by the embodiment of the application, if the number of the three-phase transformation equipment is at least one, the reactive scheduling coefficient corresponding to each three-phase transformation equipment is respectively determined according to the schedulable reactive capacity of the at least one three-phase transformation equipment, the target reactive current adjusting quantity of each three-phase transformation equipment in each phase is respectively determined according to the reactive current adjusting quantity of each phase and the reactive scheduling coefficient corresponding to each three-phase transformation equipment, and therefore each three-phase transformation equipment can achieve the reactive component close to zero according to the reactive active current adjusting quantity.

On the basis of the load adjustment method shown in fig. 3, an embodiment of the present application further provides another load adjustment method. Optionally, fig. 6 is a schematic flowchart of another load regulation method provided by the embodiment of the present application, and as shown in fig. 6, when the active current of each phase is the active current (IA, IB, IC side) of each phase at the grid side, the method S301 calculates the active current regulation amount of each phase according to the active current of each phase, respectively, including:

and S601, calculating a first average active current according to the active current of each phase.

And averaging the active currents of the three phases to obtain a first average active current.

And S602, respectively calculating the active current regulating quantity of each phase by adopting a preset active current loop control algorithm according to the first average active current and the active current of each phase.

Specifically, the first average active current and the phase a (or the phase B or the phase C) are input into a preset active current loop control algorithm, so that the active current adjustment amount of the phase a (or the phase B or the phase C) can be obtained.

The preset active current loop control algorithm can be a PI control algorithm, the first average active current is used as a target quantity through amplitude limitation of the PI control algorithm, the active current of each phase is used as input information, and the PI control algorithm can output corresponding regulating quantity. The magnitude and direction of the regulating variable represent the active component and the magnitude.

According to the load regulation method provided by the embodiment of the application, when the active current of each phase is the active current of each phase on the power grid side, the first average active current is calculated according to the active current of each phase, the active current regulation quantity of each phase is respectively calculated according to the first average active current and the active current of each phase by adopting a preset active current loop control algorithm, and then the target active current regulation quantity of each three-phase conversion device in each phase can be determined through the active current regulation quantity of each phase.

On the basis of the load adjustment method shown in fig. 3, an embodiment of the present application further provides another load adjustment method. Optionally, when the reactive current of each phase is the reactive current (IA, IB, IC side) of each phase on the grid side, the method S302 determines the reactive current adjustment amount of each phase according to the reactive current of each phase, respectively, and includes:

and respectively calculating reactive current regulating quantity of each phase by adopting a preset reactive current loop control algorithm according to the reactive current of each phase and a preset reference reactive current value.

Specifically, a preset reference reactive current value and a phase a (or a phase B, or a phase C) are input into a preset reactive current loop control algorithm, so that a reactive current adjustment amount of the phase a (or the phase B, or the phase C) can be obtained.

In the embodiment of the present application, the preset reference reactive current value may be O amperes.

The preset reactive current loop control algorithm can be a PI control algorithm, amplitude limitation is carried out on the PI control algorithm, a preset reference reactive current value is used as a target quantity, the reactive current of each phase is used as input information, and the PI control algorithm can output corresponding regulating quantity. The magnitude and direction of the adjustment amount represent the reactive component as well as the magnitude.

According to the load adjusting method provided by the embodiment of the application, the reactive current adjusting quantity of each phase is respectively calculated by adopting a preset reactive current loop control algorithm according to the reactive current of each phase and a preset reference reactive current value, and then the target reactive current adjusting quantity of each three-phase conversion device in each phase can be determined through the reactive current adjusting quantity of each phase.

On the basis of the load adjustment method shown in fig. 3, an embodiment of the present application further provides another load adjustment method. Optionally, fig. 7 is a schematic flowchart of another load adjustment method provided in this embodiment of the present application, and as shown in fig. 7, when the active current of each phase is the active current of each phase on the load side (the IAL, IBL, ICL side), the method S301 calculates the active current adjustment amount of each phase according to the active current of each phase, respectively, where the method includes:

and S701, calculating a second average active current according to the active current of each phase.

And calculating the average value of the active currents of the three phases to obtain a second average active current.

And S702, obtaining the active current regulating quantity of each phase according to the difference value of the second average active current and the active current of each phase.

Specifically, the difference value between the active current of each phase and the second average active current is used as the active current regulating quantity of each phase.

According to the load regulation method provided by the embodiment of the application, when the active current of each phase is the active current of each phase on the load side, the second average active current is calculated according to the active current of each phase, the active current regulation quantity of each phase is obtained according to the difference value between the active current of each phase and the second average active current, and then the target active current regulation quantity of each three-phase conversion device in each phase can be determined according to the active current regulation quantity of each phase.

On the basis of the load adjustment method shown in fig. 3, an embodiment of the present application further provides another load adjustment method. Optionally, when the active current of each phase is the active current (IAL, IBL, ICL side) of each phase at the load side, the method S302 determines the reactive current adjustment amount of each phase according to the reactive current of each phase, respectively, including:

According to the load adjusting method provided by the embodiment of the application, the reactive current of each phase is the reactive current of each phase at the load side, the reactive current of each phase is determined to be the reactive current adjusting quantity of each phase, and then the target reactive current adjusting quantity of each three-phase conversion device at each phase can be determined through the reactive current adjusting quantity of each phase.

On the basis of the load adjustment method shown in fig. 3, an embodiment of the present application further provides another load adjustment method. Optionally, fig. 8 is a schematic flow chart of another load adjustment method provided in this embodiment of the present application, and as shown in fig. 8, the obtaining, by the method S201, power currents of respective phases in three phases corresponding to a preset ac bus includes:

and S801, detecting three-phase current and three-phase voltage corresponding to a preset alternating current bus.

The method comprises the steps of detecting three-phase currents and three-phase voltages on a power grid side or a load side of a preset alternating-current bus.

And S802, respectively determining the active current and the reactive current of each phase according to the current and the voltage of the three phases.

According to the three-phase voltage, the frequency and the phase can be obtained through phase-locked loop processing, and according to the frequency and the phase and the current of each phase in the three phases, the active current of each phase and the reactive current of each phase can be determined through single-phase current detection.

Specifically, the voltage of the a phase can be processed by a phase-locked loop to obtain a frequency and a phase, wherein the phase is a detection phase of the a phase, and since the phase difference of three phases is 120 degrees, the active current of the a phase and the reactive current of the a phase can be obtained by single-phase current detection according to the frequency, the phase and the a-phase current; according to the frequency, the phase minus 120 and the phase B current, the active current of the phase B and the reactive current of the phase B can be obtained through single-phase current detection; according to the frequency, the phase plus 120 and C phase currents, the active current of the C phase and the reactive current of the C phase can be obtained through single-phase current detection.

Optionally, the three-phase voltages may be processed by phase-locked loops respectively to obtain a frequency and a phase of each phase, where the phase of each phase is a detected phase of an a phase, a detected phase of a B phase, and a detected phase of a C phase, and then the active current of each phase and the reactive current of each phase may be obtained by single-phase current detection according to the frequency, the phase of each phase, and the current of each phase.

According to the load adjusting method provided by the embodiment of the application, the three-phase current and the three-phase voltage corresponding to the preset alternating-current bus are detected, the active current and the reactive current of each phase are respectively determined according to the three-phase current and the three-phase voltage, and the active current and the reactive current of each phase under the detection condition are determined.

On the basis of the load adjustment method shown in fig. 3, an embodiment of the present application further provides another load adjustment method. Optionally, fig. 9 is a schematic flow chart of another load adjustment method provided in this embodiment of the present application, and as shown in fig. 9, the obtaining, by the method S201, power currents of respective phases in three phases corresponding to a preset ac bus includes:

and S901, acquiring power and power factor information of each three-phase conversion device.

If the system does not detect the current and voltage conditions, before each three-phase conversion device is connected to the system as required, the power and power factor information (the relation curve of the corresponding relation between the power factor and the voltage) of the operation of each three-phase conversion device is provided to a control device in the load regulation system, namely the power and power factor information of each three-phase conversion device is obtained.

Alternatively, the power factor information may be: the three-phase transformation equipment calculates or measures the curve relation of the power factor of all power sections from 0 to full power under different AC network voltages. Particularly, when the machine is shut down and connected into an alternating current power grid, the capacitive reactive power of the EMC capacitor is uncontrollable, the capacitive reactive current is in direct proportion to the effective value of the voltage of the power grid, and the voltage relation of the power grid needs to be considered.

Optionally, if the system has no detection condition, for a local small range such as a charging station or a parking lot, the three-phase transformation devices can be networked for communication to upload the data values to the control device.

And S902, determining the active current and the reactive current of each phase according to the power of each three-phase conversion device, the power factor information of each three-phase conversion device and the voltage of a preset alternating current power supply.

Each three-phase transformation device comprises a preset alternating current power supply which is connected with a preset alternating current bus.

The power factor corresponding to the voltage can be determined according to the voltage of the preset alternating current power supply and the power factor information of each three-phase conversion device. According to the power factor and the power corresponding to the voltage, the active power (the power factor is multiplied by the power) can be calculated, and then the active current can be calculated according to the active power and the voltage. Thus, the active current of each phase can be determined.

According to the power factor and the power corresponding to the voltage, the reactive power ((1-power factor) power) can be calculated, and further, according to the reactive power and the voltage, the reactive current can be calculated. Thus, the reactive current of each phase can be determined.

The power and power factor information of each three-phase conversion device are obtained through communication instead of real-time current detection, cost can be saved, however, the dynamic adjusting speed is limited by the communication transmission speed, when the communication transmission is slow, the adjusting speed is slow, and when the communication transmission is fast, the adjusting speed is fast.

According to the load adjusting method provided by the embodiment of the application, the power and the power factor information of each three-phase conversion device are obtained, the active current of each phase and the reactive current of each phase are determined according to the power of each three-phase conversion device, the power factor information of each three-phase conversion device and the voltage of the preset alternating current power supply, and the determination of the active current of each phase and the reactive current of each phase without detection conditions is realized.

For the following description, specific implementation processes and technical effects of the charging control device, the controller and the storage medium provided by the present application for execution are described above, and will not be described again below.

Fig. 10 is a schematic view of a load adjustment apparatus provided in an embodiment of the present application, and as shown in fig. 10, the load adjustment apparatus includes:

the obtaining module 1001 is configured to obtain a power current of each phase in three phases corresponding to a preset alternating current bus.

The calculating module 1002 is configured to calculate a current adjustment amount of each phase according to the power current of each phase.

The determining module 1003 is configured to determine, according to the current adjustment amount of each phase, a target current adjustment amount of each three-phase transformation device in the at least one three-phase transformation device to be scheduled in each phase.

A sending module 1004, configured to send the target current adjustment amount of each phase to each three-phase conversion device, so that each three-phase conversion device respectively adjusts the load of each phase on the preset ac busbar according to the target current adjustment amount of each phase.

Optionally, the calculating module 1002, specifically for the power current, includes: the active current and the reactive current respectively calculate the current regulating quantity of each phase according to the power current of each phase, and the method comprises the following steps: respectively calculating the active current regulating quantity of each phase according to the active current of each phase; respectively determining reactive current regulating quantity of each phase according to the reactive current of each phase; respectively determining a target current regulation amount of each three-phase transformation device in at least one three-phase transformation device to be scheduled in each phase according to the current regulation amount of each phase, wherein the target current regulation amount comprises the following steps: respectively determining the target active current regulating quantity of each phase of each three-phase transformation device in at least one three-phase transformation device to be scheduled according to the active current regulating quantity of each phase; determining the target reactive current regulating quantity of each three-phase conversion device in each phase according to the reactive current regulating quantity of each phase; transmitting the target current adjustment amount of each phase to each three-phase transformation device, including: and sending the target active current regulating quantity and the target reactive current regulating quantity of each phase to each three-phase conversion device.

Optionally, the determining module 1003 is specifically configured to, if the number of the three-phase transformation devices is at least one, respectively determine, according to the active current adjustment amount of each phase, a target active current adjustment amount of each three-phase transformation device in the at least one three-phase transformation device to be scheduled, where the determining module includes: respectively determining an active scheduling coefficient corresponding to each three-phase transformation device according to the schedulable active capacity of at least one three-phase transformation device; and respectively determining the target active current regulating quantity of each three-phase transformation device in each phase according to the active current regulating quantity of each phase and the active scheduling coefficient corresponding to each three-phase transformation device in at least one three-phase transformation device.

Optionally, the determining module 1003 is specifically configured to, if the number of the three-phase conversion devices is at least one, determine the target reactive current adjustment amount of each phase of each three-phase conversion device according to the reactive current adjustment amount of each phase, and includes: respectively determining a reactive power dispatching coefficient corresponding to each three-phase conversion device according to the dispatching reactive power capacity of at least one three-phase conversion device; and respectively determining the target reactive current regulating quantity of each three-phase transformation device in each phase according to the reactive current regulating quantity of each phase and the reactive scheduling coefficient corresponding to each three-phase transformation device.

Optionally, the calculating module 1002 is specifically configured to calculate the active current adjustment amount of each phase according to the active current of each phase, where the active current of each phase is the active current of each phase on the power grid side, and includes: calculating a first average active current according to the active current of each phase; and respectively calculating the active current regulating quantity of each phase by adopting a preset active current loop control algorithm according to the first average active current and the active current of each phase.

Optionally, the determining module 1003 is specifically configured to determine the reactive current of each phase as the reactive current of each phase on the grid side, and respectively determine the reactive current adjustment amount of each phase according to the reactive current of each phase, where the determining module includes: and respectively calculating reactive current regulating quantity of each phase by adopting a preset reactive current loop control algorithm according to the reactive current of each phase and a preset reference reactive current value.

Optionally, the calculating module 1002 is specifically configured to calculate the active current adjustment amount of each phase according to the active current of each phase, where the active current of each phase is the active current of each phase at the load side, and the calculating includes: calculating a second average active current according to the active current of each phase; and obtaining the active current regulating quantity of each phase according to the difference value of the active current of each phase and the second average active current.

Optionally, the determining module 1003 is specifically configured to determine the reactive current of each phase as the reactive current of each phase at the load side, and respectively determine the reactive current adjustment amount of each phase according to the reactive current of each phase, where the determining module includes: and determining the reactive current of each phase as the reactive current regulating quantity of each phase.

Optionally, the obtaining module 1001 is specifically configured to detect a three-phase current and a three-phase voltage corresponding to a preset ac bus; and respectively determining the active current of each phase and the reactive current of each phase according to the current of the three phases and the voltage of the three phases.

Optionally, the obtaining module 1001 is specifically configured to obtain power and power factor information of each three-phase conversion device; and determining the active current and the reactive current of each phase according to the power of each three-phase conversion device, the power factor information of each three-phase conversion device and the voltage of a preset alternating current power supply.

These above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when one of the above modules is implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. As another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

Fig. 11 is a schematic diagram of a control device according to an embodiment of the present application, where the control device may be an apparatus with a calculation processing function.

The control device includes: a processor 1101, a storage medium 1102, a bus 1103. The processor 1101 and the storage medium 1102 are connected by a bus 1103.

The storage medium 1102 is used to store a program, and the processor 1101 calls the program stored in the storage medium 1102 to execute the above-described method embodiments. The specific implementation and technical effects are similar, and are not described herein again.

Optionally, the present invention also provides a program product, for example a computer-readable storage medium, comprising a program which, when being executed by a processor, is adapted to carry out the above-mentioned method embodiments.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer-readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for enabling a control device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the method according to various embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a portable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other media capable of storing program codes.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of load regulation, comprising:

2. The load regulation method of claim 1, wherein the power current comprises: the method comprises the steps of calculating the current regulation quantity of each phase according to the power current of each phase, wherein the current regulation quantity comprises the following steps:

respectively determining reactive current regulating quantity of each phase according to the reactive current of each phase;

the transmitting the target current adjustment amount of each phase to each three-phase transformation device includes:

3. The load regulation method according to claim 2, wherein if the number of the three-phase converter devices is at least one, the determining the target active current regulation amount of each of the at least one three-phase converter device to be scheduled in each phase according to the active current regulation amount of each phase respectively comprises:

4. The method according to claim 2, wherein if the number of the three-phase converter devices is at least one, the determining the target reactive current regulating quantity of each three-phase converter device in each phase according to the reactive current regulating quantity of each phase comprises:

5. The load regulation method according to claim 2, wherein the active current of each phase is the active current of each phase on the grid side; the calculating the active current regulating quantity of each phase according to the active current of each phase includes:

6. The load regulation method according to claim 2, wherein the reactive current of each phase is a reactive current of each phase on the grid side; the determining the reactive current regulating quantity of each phase according to the reactive current of each phase comprises:

7. The load regulation method according to claim 2, wherein the active current of each phase is the active current of each phase on the load side; the calculating the active current regulating quantity of each phase according to the active current of each phase includes:

8. The load regulation method according to claim 2, wherein the reactive current of each phase is a reactive current of each phase on a load side; the determining the reactive current regulating quantity of each phase according to the reactive current of each phase comprises:

9. The load regulation method according to claim 2, wherein the obtaining of the power current of each of the three phases corresponding to the preset alternating current bus comprises:

10. The load regulation method according to claim 2, wherein the obtaining of the power current of each of the three phases corresponding to the preset alternating current bus comprises:

and determining the active current and the reactive current of each phase according to the power of each three-phase conversion device, the power factor information of each three-phase conversion device and the voltage of a preset alternating current power supply.

11. A load regulation system, comprising: the device comprises a transformer, at least one three-phase conversion device, a control device and a load;

the transformer is used for electrically connecting a preset alternating current bus, the at least one three-phase transformation device is used for electrically connecting the preset alternating current bus, the load is used for electrically connecting the preset alternating current bus, the control device is in communication connection with the control unit of each three-phase transformation device, the control device is electrically connected with the outgoing line of the transformer, the control device is also electrically connected with the incoming line of the load, and the control device is used for executing the load adjusting method of any one of the claims 1 to 10.