CN117081129A

CN117081129A - Control method, controller, power supply system and storage medium of energy storage UPS

Info

Publication number: CN117081129A
Application number: CN202311125117.8A
Authority: CN
Inventors: 戴永辉; 周圣焱; 石楚源; 陈志彬; 刘艺超; 李权峰
Original assignee: Kehua Data Co Ltd
Current assignee: Kehua Data Co Ltd
Priority date: 2023-09-01
Filing date: 2023-09-01
Publication date: 2023-11-17

Abstract

The application provides a control method, a controller, a power supply system and a storage medium of an energy storage UPS. The energy storage UPS comprises a bidirectional rectifier, an inverter and a battery; one end of the bidirectional rectifier is used for connecting with the mains supply, the other end of the bidirectional rectifier is connected with the direct current bus, one end of the inverter is connected with the direct current bus, the other end of the inverter is used for connecting with the load, and the battery is connected with the direct current bus; the control method comprises the following steps: acquiring battery power of a battery and load power of a load in a preset peak electricity period; when the power of the battery is greater than or equal to the power of the load, the battery is controlled to be in a working state, and the bidirectional rectifier is controlled to be in a reverse inversion state so that the battery supplies power to the load and supplies power to the mains supply. The application can expand the power supply mode of the energy storage UPS, so that the application scene of the energy storage UPS is wider.

Description

Control method, controller, power supply system and storage medium of energy storage UPS

Technical Field

The present application relates to the technical field of UPS control, and in particular, to a control method, a controller, a power supply system, and a storage medium for an energy storage UPS.

Background

An uninterruptible power supply (Uninterruptible Power System, UPS) may provide uninterrupted power to a load. When the mains supply is normal, the mains supply supplies power to the load through the rectifier and the inverter. When the mains supply is interrupted, the battery in the UPS may supply power to the load through the inverter to maintain stable operation of the load.

However, with the increasing of urban electricity consumption, most cities optimize the urban power structure by setting peak-to-valley electricity prices, so that the urban power supply balance is maintained to a certain extent. However, the battery in the conventional UPS is used as a standby power source to start power supply only when the mains supply fails, and the power supply mode is single and does not have the peak clipping and valley filling functions.

Disclosure of Invention

The application provides a control method, a controller, a power supply system and a storage medium of an energy storage UPS, which are used for solving the problem that the UPS is single in power supply mode and does not have peak clipping and valley filling functions.

In a first aspect, the present application provides a method for controlling an energy storage UPS, the energy storage UPS including a bidirectional rectifier, an inverter, and a battery; one end of the bidirectional rectifier is used for connecting with the mains supply, the other end of the bidirectional rectifier is connected with the direct current bus, one end of the inverter is connected with the direct current bus, the other end of the inverter is used for connecting with the load, and the battery is connected with the direct current bus;

the control method comprises the following steps:

acquiring battery power of a battery and load power of a load in a preset peak electricity period;

when the power of the battery is greater than or equal to the power of the load, the battery is controlled to be in a working state, and the bidirectional rectifier is controlled to be in a reverse inversion state so that the battery supplies power to the load and supplies power to the mains supply.

In one possible implementation, when the battery power is greater than or equal to the load power, the control method further includes:

judging whether the battery is in an abnormal state or not and judging whether the mains supply is in an abnormal state or not;

when the battery is in an abnormal state and the mains supply is not in the abnormal state, controlling the battery to stop outputting, and controlling the bidirectional rectifier to be in a forward rectifying state so as to enable the mains supply to supply power to a load;

when the battery is not in an abnormal state and the commercial power is in an abnormal state, the battery is controlled to reduce the power output, and the bidirectional rectifier is controlled to stop working, so that the battery supplies power to the load and stops feeding power to the commercial power.

In one possible implementation, the energy storage UPS further includes a bypass switch, one end of the bypass switch being used for connecting with a bypass mains, and the other end being used for connecting with a load;

the control method further comprises the following steps:

when the battery is in an abnormal state and the commercial power is in an abnormal state, the battery is controlled to stop outputting, the bidirectional rectifier is controlled to stop working, and the bypass switch is closed, so that the bypass commercial power supplies power for the load.

In one possible implementation, after controlling the battery to be in an operating state and controlling the bidirectional rectifier to be in a reverse inversion state, the control method further includes:

If the load is unloaded, the battery is controlled to be reduced to a first preset no-load power.

In one possible implementation, the control method further includes:

when the battery power is smaller than the load power, the battery is controlled to be in a working state, and the bidirectional rectifier is controlled to be in a forward rectifying state, so that the commercial power and the battery supply power to the load together.

In one possible implementation, when the battery power is less than the load power, the control method further includes:

when the battery is in an abnormal state and the commercial power is not in the abnormal state, controlling the battery to stop outputting, and controlling the output power of the commercial power to rise so that the commercial power supplies power to the load, and stopping supplying power to the load by the battery;

when the battery is not in an abnormal state and the commercial power is in an abnormal state, the bidirectional rectifier is controlled to stop working, and the battery is controlled to increase power output so that the battery supplies power to the load and the commercial power stops supplying power to the load.

In one possible implementation, after controlling the battery to be in an operating state and controlling the bidirectional rectifier to be in a forward rectifying state, the control method further includes:

If the load is unloaded, the battery is controlled to continue to work, and the commercial power is controlled to be reduced to a second preset no-load power.

In a second aspect, the present application provides a control device of an energy storage UPS, the energy storage UPS including a bidirectional rectifier, an inverter, and a battery; one end of the bidirectional rectifier is used for connecting with the mains supply, the other end of the bidirectional rectifier is connected with the direct current bus, one end of the inverter is connected with the direct current bus, the other end of the inverter is used for connecting with the load, and the battery is connected with the direct current bus;

the control device includes:

the acquisition module is used for acquiring battery power of the battery and load power of the load in a preset peak electricity period;

and the first control module is used for controlling the battery to be in a working state and controlling the bidirectional rectifier to be in a reverse inversion state when the power of the battery is larger than or equal to the power of the load so as to enable the battery to supply power to the load and supply power to the commercial power.

In a third aspect, the present application provides a controller comprising a memory and a processor, the memory storing a computer program executable on the processor, the processor executing the computer program to implement the steps of the method for controlling an energy storage UPS as described above in the first aspect or any one of the possible implementations of the first aspect.

In a fourth aspect, the present application provides a power supply system comprising a controller as in the third aspect above.

In a fifth aspect, the present application provides a computer readable storage medium storing a computer program which when executed by a processor implements the steps of a method of controlling an energy storage UPS as described above in the first aspect or any one of the possible implementations of the first aspect.

The application provides a control method, a controller, a power supply system and a storage medium of an energy storage UPS, wherein the energy storage UPS comprises a bidirectional rectifier, and the battery power of a battery and the load power of a load are obtained through a preset peak electricity period; when the battery power is greater than or equal to the load power, the battery is controlled to be in a working state, and the bidirectional rectifier is controlled to be in a reverse inversion state, so that the battery supplies power to the load and feeds power to the mains supply, the battery is started in a peak power period, excessive power grid energy is avoided being occupied, the power supply balance of a regional power grid is balanced, peak clipping and valley filling are realized to a certain extent, the power supply mode of the energy storage UPS is expanded, and the application scene of the energy storage UPS is wider.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a conventional UPS according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an energy storage UPS according to an embodiment of the present application;

FIG. 3 is a flowchart illustrating a method for controlling an energy storage UPS according to an embodiment of the present application;

FIG. 4 is a schematic diagram of loop switching logic for battery abnormality according to an embodiment of the present application;

FIG. 5 is a schematic diagram of loop switching logic during a mains supply abnormality according to an embodiment of the present application;

FIG. 6 is a schematic diagram of another energy-storing UPS according to an embodiment of the present application;

FIG. 7 is a schematic diagram of loop switching logic when both the battery and the mains supply are abnormal according to an embodiment of the present application;

FIG. 8 is a schematic diagram of loop switching logic during load dump according to an embodiment of the present application;

FIG. 9 is a schematic diagram of loop switching logic for another battery anomaly provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of loop switching logic for a power supply abnormality according to another embodiment of the present application;

FIG. 11 is a schematic diagram of another loop switching logic for abnormal battery and mains supply according to an embodiment of the present application;

FIG. 12 is a schematic diagram of loop switching logic during load dump according to another embodiment of the present application;

fig. 13 is a schematic structural diagram of a control device of an energy storage UPS according to an embodiment of the present application;

Fig. 14 is a schematic diagram of a controller according to an embodiment of the present application.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of an existing UPS provided in an embodiment of the present application, and as shown in fig. 1, the existing UPS may generally include an AC/DC module, a DC/AC module, and a battery module. A direct current bus is arranged between the AC/DC module and the DC/AC module, and the output end of the battery is connected with the direct current bus.

When the commercial power is normal, the battery is in a dormant state, the power grid sequentially rectifies through the AC/DC module, inverts through the DC/AC module and finally supplies power to the load.

When the commercial power is abnormal, the commercial power is disconnected, and the battery is awakened, so that the battery reversely supplies power to the load through the DC/AC module, and the running stability of the load is ensured.

After the commercial power is recovered to be normal, the commercial power is started, and the battery is closed, so that the commercial power can charge the battery.

Generally, in the conventional UPS, only whether the mains supply is abnormal is considered in the power supply process, and further whether to wake up the battery for power supply is determined. However, with the continuous development of urban power supply, in order to relieve power supply pressure and avoid power waste, cities can set peak-to-valley electricity prices according to different use periods. Namely, the electricity consumption peak electricity price is high, and the electricity consumption valley electricity price is low.

The existing UPS is single in power supply mode, only the battery is started to supply power when the commercial power is abnormal, the use cost brought to a user by peak-valley electricity price is not considered, peak clipping and valley filling cannot be realized, the power supply balance of a region can be affected, and the power supply stability of the region is reduced.

In order to solve the above problems, the embodiment of the application provides a control method of an energy storage UPS, which is characterized in that an AC/DC module in a conventional UPS is replaced by a bidirectional rectifying module, peak clipping and valley filling are realized by combining peak electricity time periods, and a regional power structure is balanced on the basis of reducing the use cost of users.

The following is a specific description:

FIG. 2 is a schematic diagram of an energy storage UPS according to an embodiment of the present application, as shown in FIG. 2, in an embodiment of the present application, the energy storage UPS may include a bi-directional rectifier, an inverter, and a battery; one end of the bidirectional rectifier is used for being connected with the mains supply, the other end of the bidirectional rectifier is connected with the direct current BUS, one end of the inverter is connected with the direct current BUS, the other end of the inverter is used for being connected with the load, and the battery is connected with the direct current BUS.

In an embodiment of the present application, the bidirectional rectifier may be a bidirectional AC/DC module, and the bidirectional rectifier has two operation states, i.e., a forward rectifying state or a reverse inverting state.

When the bidirectional rectifier is in a forward rectifying state, the commercial power sequentially supplies power to the load through the bidirectional rectifier and the inverter. When the bidirectional rectifier is in the reverse inversion state, the battery can feed the commercial power through the bidirectional rectifier.

Referring to fig. 3, a flowchart of an implementation method of the energy storage UPS provided by an embodiment of the present application is shown. As shown in fig. 3, a control method of the energy storage UPS may include S101 and S102.

S101, acquiring battery power of a battery and load power of a load in a preset peak power period.

In the embodiment of the application, a day can be divided into a peak electricity period, a valley electricity period and a flat peak period according to different electricity consumption conditions. The electricity prices of different periods are different, the electricity price of the peak electricity period is highest, the electricity price of the valley electricity period is lowest, and the electricity price of the flat peak period is in the middle of the peak electricity period and the valley electricity period.

Illustratively, the peak electricity period may be 10-12 points and 14-19 points, the valley electricity period may be 0-8 points, and the rest periods are flat peak periods. The specific peak-to-valley time periods can be divided according to regional power utilization conditions.

In a preset peak power period, the battery power of the battery, that is, the power that the battery can output, can be obtained. And acquiring load power of the load, namely, power required by the load to operate.

And S102, when the battery power is greater than or equal to the load power, controlling the battery to be in a working state and controlling the bidirectional rectifier to be in a reverse inversion state so as to enable the battery to supply power to the load and supply power to the commercial power.

The battery is in a dormant state by default, when the battery power is greater than or equal to the load power, the battery power is indicated to have redundancy on the basis of meeting the load power, the battery can be awakened to start to work at the moment, and the bidirectional rectifier is controlled to be in a reverse inversion state.

After the battery starts to work and the bidirectional rectifier is in a reverse inversion state, the battery can supply power to a load through the inverter, and meanwhile, the bidirectional rectifier reversely inverts and feeds power to the commercial power.

Specifically, when the battery power is greater than or equal to the load power, the power supply line of the energy storage UPS may be as follows:

power supply line 1: battery → inverter → load.

Power supply line 2: battery → bi-directional rectifier → mains.

According to the embodiment of the application, in the peak electricity period, the mains supply is stopped, and the battery is started to supply power to the load, so that the regional power supply pressure can be reduced, the situation that a user uses high-price electricity in the electricity consumption peak is avoided, and the electricity consumption cost of the user is reduced.

In addition, the embodiment of the application controls the bidirectional rectifier to be in an inversion state so that the battery feeds power to the power grid, the electricity consumption gap can be earned, the electricity consumption cost of a user is further reduced on the basis of realizing peak clipping and valley filling, the power supply mode of the energy storage UPS is expanded, and the application scene of the energy storage UPS is wider.

In some embodiments of the present application, when the battery power is greater than or equal to the load power, the control method may further include:

and judging whether the battery is in an abnormal state or not and judging whether the commercial power is in an abnormal state or not.

When the battery is in an abnormal state and the mains supply is not in the abnormal state, the battery is controlled to stop outputting, and the bidirectional rectifier is controlled to be in a forward rectifying state so that the mains supply supplies power to the load.

When the battery power is greater than or equal to the load power, if the battery is abnormal and the commercial power is not abnormal, the battery can be controlled to stop outputting, and the bidirectional rectifier is controlled to be in a forward rectifying state, so that the commercial power sequentially supplies power to the load through the bidirectional rectifier and the inverter. At this time, the power supply line of the energy storage UPS is: mains supply, bidirectional rectifier, inverter, load.

Wherein controlling the bi-directional rectifier in the forward rectifying state may include: the bidirectional rectifier is controlled to be switched from a reverse inversion state to a forward rectification state or from an inactive state to a forward rectification state.

Specifically, when the battery is suddenly abnormal, the bidirectional rectifier can be controlled to be switched from a reverse inversion state to a forward rectification state, so that the reliable power supply of the load is ensured.

When the energy storage UPS is normal from a battery and the commercial power is abnormal, and the commercial power is normal, the bidirectional rectifier can be controlled to be switched from an unoperated state to a forward rectifying state so as to ensure that the load is reliably powered.

Specifically, the output of the battery can be closed by controlling a battery voltage loop, loop parameters in a reverse inversion state are cleared by controlling a direct current bus voltage loop, and the loop parameters in a forward rectification state are increased, so that the output power of the bidirectional rectifier in the forward rectification state is increased, and the load is ensured not to be powered down.

Fig. 4 is a schematic diagram of loop switching logic when a battery is abnormal, as shown in fig. 4, where Uboost_PID.out and integral Uboost_PID.ui in a battery voltage loop may be controlled to be cleared when the battery is abnormal, and the battery driving output is turned off.

And the Udc_PID.out and the integral Udc_PID.Ui in the direct-current bus voltage loop are controlled to be cleared to realize quick response, and the direct-current bus voltage loop is further positively increased to increase the output power of the commercial power, so that the commercial power supplies power to the load, and the load is ensured not to be powered down. Wherein, the output power of the regulated mains supply is not less than the load power.

When the power of the battery is larger than or equal to the load power, if the battery is normal and the commercial power is abnormal, the battery can be controlled to reduce the power output, and the bidirectional rectifier is controlled to stop the reverse inversion work so as to stop the battery from feeding the commercial power. At this time, the power supply line of the energy storage UPS is: battery → inverter → load.

In particular, the battery output power may be reduced by controlling the battery voltage loop, and the feed may be turned off by controlling the dc bus voltage loop.

Fig. 5 is a schematic diagram of loop switching logic when the utility power is abnormal, as shown in fig. 5, where Uboost_PID.out and integral Uboost_PID.ui in the battery voltage loop can be controlled to be reduced when the utility power is abnormal, so as to maintain the battery to supply power to the load and ensure that the load is not powered down. Wherein, the output power of the battery after adjustment is not less than the load power.

And controlling the udc_PID.out and the integral udc_PID.ui in the direct current bus voltage loop to be reversely cleared, closing the output of the bidirectional rectifier in a reverse inversion state, and stopping feeding power to the commercial power.

According to the embodiment of the application, the working states of the battery and the commercial power are detected, when the battery or the commercial power is abnormal, the working states of the battery and the bidirectional rectifier are controlled through the loop, and on the premise of ensuring reliable power supply of a load, the influence of abnormal factors on the energy storage UPS is cut off, so that the power supply stability of the energy storage UPS is improved.

Fig. 6 is a schematic structural diagram of another energy storage UPS according to an embodiment of the present application, as shown in fig. 6, in some embodiments of the present application, the energy storage UPS further includes a bypass switch SCR, where one end of the bypass switch SCR is used to connect with a bypass mains supply, and the other end is used to connect with a load.

The control method further comprises the following steps:

When the battery power is greater than or equal to the load power, if the battery is abnormal and the commercial power is abnormal, the battery can be controlled to stop outputting, the bidirectional rectifier is controlled to stop working, and the bypass switch SCR is closed, so that the bypass commercial power supplies power for the load. The bypass mains supply and the mains supply in fig. 6 are two different sources of power supply. At this time, the power supply line of the energy storage UPS is: bypass mains supply, bypass switch SCR, load.

Fig. 7 is a schematic diagram of loop switching logic for both battery and mains abnormality, where, as shown in fig. 7, uboost_PID out and integral Uboost_PID.ui in a battery voltage loop may be controlled to be cleared when both the mains and the battery are abnormal, and the battery driving output is turned off.

And, the udc_pid.out and the integral udc_pid.ui in the direct current bus voltage loop are controlled to be reversely cleared, the bidirectional rectifier is controlled to stop working, the supply of the commercial power is stopped, and the commercial power is forbidden to supply power to the load.

And the bypass switch SCR is controlled to be closed, so that the bypass mains supply can reliably supply power to the load, and the load is ensured not to be powered down.

According to the embodiment of the application, when the commercial power and the battery are abnormal, the power supply is switched to the bypass to supply power to the load, so that the power supply reliability of the energy storage UPS is improved.

In some embodiments of the present application, after controlling the battery to be in an operating state and controlling the bidirectional rectifier to be in a reverse inversion state, the control method further includes: if the load is unloaded, the battery is controlled to be reduced to a first preset no-load power.

If the load power is reduced within the preset time period and is lower than the preset power, the load is judged to be unloaded, namely the load is suddenly unloaded. The preset time length can be set according to actual conditions.

When the power of the battery is greater than or equal to the load power, if sudden unloading occurs, the output power of the battery can be controlled to be reduced to the first preset no-load power, the phenomenon that the bus voltage is arched up and devices are damaged when sudden unloading occurs is avoided, and meanwhile the energy storage UPS is guaranteed not to be powered down.

Fig. 8 is a schematic diagram of loop switching logic during sudden load shedding, and as shown in fig. 8, when sudden load shedding occurs, the Uboost_PID.out and the integral Uboost_PID.ui in the battery voltage loop may be controlled to perform the integration de-integration and zero clearing processes, so as to reduce the output power of the battery. That is, uboost_PID.out and Uboost_PID.Ui can be controlled to clear and then raise.

And, the udc_pid.out and the integral udc_pid.ui in the direct current bus voltage loop are controlled to be reversely increased, and the feed network output of the bidirectional rectifier in a reverse inversion state is increased.

According to the embodiment of the application, when the battery power is greater than or equal to the load power and sudden unloading occurs, the output power of the battery is controlled to be reduced, the damage of devices caused by the upper arch of the direct current bus voltage is avoided, the service life of the devices in the energy storage UPS is ensured, and the working reliability of the energy storage UPS is improved.

In some embodiments of the application, the control method further comprises:

The battery is in a dormant state by default, when the battery power is smaller than the load power, the battery power is indicated to be difficult to meet the load power, and at the moment, the bidirectional rectifier can be controlled to be in a forward rectifying state besides waking up the battery to start to work.

After the battery starts to work and the bidirectional rectifier is in a forward rectifying state, the battery can supply power to the load through the inverter, meanwhile, the commercial power supplies power to the load through the bidirectional rectifier and the inverter, and the battery and the commercial power supply jointly supply power to the load.

Specifically, when the battery power is greater than or equal to the load power, the bi-directional rectifier is typically in a reverse inversion state. When the battery power suddenly drops or the load power suddenly rises, so that the battery power is smaller than the load power, the bidirectional rectifier can be controlled to be switched from a reverse inversion state to a forward rectification state at the moment, and the reliable operation of the load is ensured.

When the energy storage UPS is not operating, the bi-directional rectifier is typically in an inactive state. When the energy storage UPS starts to work and the battery power is smaller than the load power, the bidirectional rectifier can be controlled to be switched from an unoperated state to a forward rectifying state at the moment so as to ensure the reliable operation of the load.

Specifically, when the battery power is smaller than the load power, the power supply line of the energy storage UPS may be:

Mains supply, bidirectional rectifier, inverter, load.

Battery → inverter → load.

When the power of the battery is smaller than the power of the load in the peak power period, the embodiment of the application wakes up the battery to supply power to the load while controlling the mains supply to supply power to the load, thereby reducing the power supply output of the mains supply, reducing the power supply pressure of the area and reducing the electric charge of a user in the peak power consumption. Thereby reducing the electricity cost of the user.

In addition, the embodiment of the application can wake the battery to work regularly while reducing the power supply pressure of the commercial power by waking the battery to supply power to the load, so as to keep the activity of the battery, realize the regular detection of the battery and prolong the service life of the battery.

In some embodiments of the application, when the battery power is less than the load power, the control method further comprises:

When the battery power is smaller than the load power, if the battery is abnormal and the commercial power is not abnormal, the battery can be controlled to stop outputting, and the commercial power supply power is regulated to ensure that the commercial power reliably supplies power to the load. At this time, the power supply line of the energy storage UPS is: mains supply, bidirectional rectifier, inverter, load.

Specifically, the battery output may be shut down by controlling the battery voltage loop and the output power of the bi-directional rectifier in the forward rectified state may be increased by controlling the dc bus voltage loop.

Fig. 9 is a schematic diagram of loop switching logic when a battery is abnormal, where, as shown in fig. 9, the uboost_pid.out and the integral uboost_pid.ui in the battery voltage loop may be controlled to be cleared when the battery is abnormal, and the battery driving output is turned off.

And the udc_PID.out and the integral udc_PID.ui in the direct-current bus voltage loop are controlled to be further increased, so that the output power of the commercial power is improved, and the load is ensured not to be powered down.

When the battery power is smaller than the load power, if the battery is normal and the commercial power is abnormal, the bidirectional rectifier can be controlled to stop working, and the battery is controlled to increase the power output so as to supply power to the load. At this time, the power supply line of the energy storage UPS is: battery → inverter → load.

In particular, the battery output power can be raised by controlling the battery voltage loop, and the mains supply can be turned off by controlling the dc bus voltage loop.

Fig. 10 is a schematic diagram of loop switching logic when the utility power is abnormal, as shown in fig. 10, where the Uboost_PID.out and the integral Uboost_PID.ui in the battery voltage loop may be controlled to further increase when the utility power is abnormal, so as to increase the power of the battery to supply power to the load, and ensure that the load is not powered down.

And, the udc_pid.out and the integral udc_pid.ui in the direct current bus voltage loop are controlled to be cleared in the forward direction, the output of the bidirectional rectifier in the forward rectification state is closed, and the mains supply drive is closed.

In some embodiments of the present application, when the battery power is smaller than the load power, if the battery and the utility power are abnormal, the battery is controlled to stop outputting, the bidirectional rectifier is controlled to stop working, and the bypass switch is closed, so that the bypass utility power supplies power to the load, and the load is ensured not to be powered down.

Fig. 11 is a schematic diagram of loop switching logic for an abnormal battery and a abnormal mains supply according to another embodiment of the present application, and as shown in fig. 11, when the battery and the mains supply are abnormal, the uboost_pid out and the integral uboost_pid.ui in the battery voltage loop may be controlled to be cleared, and the battery driving output may be turned off.

And the Udc_PID.out and the integral Udc_PID.Ui in the direct current bus voltage loop are controlled to be cleared in the forward direction, the bidirectional rectifier is controlled to stop working, and the mains supply is forbidden to supply power to the load.

In some embodiments of the present application, after controlling the battery to be in an operating state and controlling the bidirectional rectifier to be in a forward rectifying state, the control method further includes:

When the battery power is smaller than the load power, if sudden unloading occurs, the output power of the battery can be controlled to be unchanged, the operation is continued, the commercial power is controlled to be reduced to the second preset no-load power, the commercial power and the battery are maintained to be output simultaneously, and the energy storage UPS is ensured not to be powered down.

Fig. 12 is a schematic diagram of loop switching logic during sudden load shedding, and as shown in fig. 12, when sudden load shedding occurs, the uboost_pid.out and the integral uboost_pid.ui in the battery voltage loop can be controlled to maintain constant current output, so as to ensure that the loop state is unchanged.

And, the udc_pid.out and the integral udc_pid.ui in the direct current bus voltage loop are controlled to be reduced in the forward direction, and the output of the bidirectional rectifier in the forward rectification state is reduced, namely the commercial power is reduced.

According to the embodiment of the application, when the battery power is smaller than the load power and sudden unloading occurs, the battery output is controlled to be unchanged, the commercial power is reduced, and the electricity consumption cost of a user in the peak electricity period can be reduced on the premise that the energy storage UPS is not powered down.

It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.

The following are device embodiments of the application, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.

Fig. 13 is a schematic structural diagram of a control device of an energy storage UPS according to an embodiment of the present application, and for convenience of explanation, only the portions relevant to the embodiment of the present application are shown, which are described in detail below:

the energy storage UPS comprises a bidirectional rectifier, an inverter and a battery; one end of the bidirectional rectifier is used for connecting with the mains supply, the other end of the bidirectional rectifier is connected with the direct current bus, one end of the inverter is connected with the direct current bus, the other end of the inverter is used for connecting with the load, and the battery is connected with the direct current bus;

as shown in fig. 13, the control device 20 of the energy storage UPS may include:

an obtaining module 201, configured to obtain, during a preset peak power period, a battery power of the battery and a load power of the load;

the first control module 202 is configured to control the battery to be in an operating state and control the bidirectional rectifier to be in a reverse inversion state when the battery power is greater than or equal to the load power, so that the battery supplies power to the load and supplies power to the mains supply.

In some embodiments of the present application, the control device 20 may further include:

a second control module for:

when the battery power is greater than or equal to the load power, judging whether the battery is in an abnormal state or not, and judging whether the mains supply is in an abnormal state or not;

In some embodiments of the present application, the energy storage UPS further includes a bypass switch, one end of the bypass switch being used for connection to a bypass mains, and the other end being used for connection to a load; the control device 20 may further include:

a third control module for:

a fourth control module for:

after the control battery is in a working state and the bidirectional rectifier is in a reverse inversion state, if the load is unloaded, the control battery is reduced to a first preset no-load power.

and the fifth control module is used for controlling the battery to be in a working state and controlling the bidirectional rectifier to be in a forward rectifying state when the battery power is smaller than the load power so as to enable the commercial power and the battery to supply power to the load together.

a sixth control module for:

when the battery power is smaller than the load power, judging whether the battery is in an abnormal state or not, and judging whether the commercial power is in an abnormal state or not;

and the seventh control module is used for controlling the battery to work continuously and controlling the commercial power to be reduced to a second preset no-load power if the load is unloaded after the battery is controlled to be in a working state and the bidirectional rectifier is controlled to be in a forward rectifying state.

Fig. 14 is a schematic diagram of a controller according to an embodiment of the present application. As shown in fig. 14, the controller 30 of this embodiment includes: a processor 300 and a memory 301, the memory 301 having stored therein a computer program 302 executable on the processor 300. The steps of the embodiments of the control method of each energy storage UPS described above are implemented by the processor 300 when the computer program 302 is executed, or the functions of the modules/units in the embodiments of each device described above are implemented by the processor 300 when the computer program 302 is executed.

By way of example, the computer program 302 may be partitioned into one or more modules/units, which are stored in the memory 301 and executed by the processor 300 to accomplish the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing particular functions to describe the execution of the computer program 302 in the controller 30.

The controller 30 may include, but is not limited to, a processor 300, a memory 301. It will be appreciated by those skilled in the art that fig. 14 is merely an example of the controller 30 and is not meant to be limiting of the controller 30, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the controller may further include input and output devices, network access devices, buses, etc.

The processor 300 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 301 may be an internal storage unit of the controller 30, such as a hard disk or a memory of the controller 30. The memory 301 may also be an external storage device of the controller 30, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the controller 30. Further, the memory 301 may also include both an internal storage unit and an external storage device of the controller 30. The memory 301 is used to store computer programs and other programs and data required by the controller. The memory 301 may also be used to temporarily store data that has been output or is to be output.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

The embodiment of the application also provides a power supply system, which comprises the controller 30.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus/controller and method may be implemented in other manners. For example, the apparatus/controller embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of 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.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the procedures in the methods of the foregoing embodiments, or may be implemented by a computer program that instructs related hardware to perform, and the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of the control method embodiments of each of the foregoing energy storage UPS. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. The control method of the energy storage UPS is characterized in that the energy storage UPS comprises a bidirectional rectifier, an inverter and a battery; one end of the bidirectional rectifier is used for connecting with a commercial power, the other end of the bidirectional rectifier is connected with a direct current bus, one end of the inverter is connected with the direct current bus, the other end of the inverter is used for connecting with a load, and the battery is connected with the direct current bus;

the control method comprises the following steps:

acquiring battery power of the battery and load power of the load in a preset peak electricity period;

and when the battery power is greater than or equal to the load power, controlling the battery to be in a working state, and controlling the bidirectional rectifier to be in a reverse inversion state so as to enable the battery to supply power to the load and supply power to the commercial power.

2. The method of claim 1, further comprising, when the battery power is greater than or equal to the load power:

judging whether the battery is in an abnormal state or not and judging whether the commercial power is in an abnormal state or not;

when the battery is in an abnormal state and the commercial power is not in the abnormal state, controlling the battery to stop outputting, and controlling the bidirectional rectifier to be in a forward rectifying state so as to enable the commercial power to supply power to the load;

when the battery is not in an abnormal state and the commercial power is in an abnormal state, controlling the battery to reduce power output, and controlling the bidirectional rectifier to stop working so that the battery supplies power to the load and stops feeding power to the commercial power.

3. The method of claim 2, further comprising a bypass switch having one end for connection to a bypass utility and another end for connection to the load;

the control method further includes:

4. The method of claim 1, further comprising, after controlling the battery to be in an active state and controlling the bidirectional rectifier to be in a reverse inversion state:

and if the load is unloaded, controlling the battery to be reduced to a first preset idle power.

5. The method of claim 1, further comprising:

and when the battery power is smaller than the load power, controlling the battery to be in a working state, and controlling the bidirectional rectifier to be in a forward rectifying state so that the commercial power and the battery supply power to the load together.

6. The method of claim 5, further comprising, when the battery power is less than the load power:

when the battery is in an abnormal state and the commercial power is not in the abnormal state, controlling the battery to stop outputting and controlling the commercial power to increase output power so that the commercial power supplies power to the load and the battery stops supplying power to the load;

When the battery is not in an abnormal state and the commercial power is in an abnormal state, the bidirectional rectifier is controlled to stop working, and the battery is controlled to raise power output so that the battery supplies power to the load and the commercial power stops supplying power to the load.

7. The method of claim 5, further comprising, after controlling the battery to be in an active state and controlling the bidirectional rectifier to be in a forward rectifying state:

and if the load is unloaded, controlling the battery to continue to work, and controlling the commercial power to be reduced to a second preset no-load power.

8. A controller comprising a memory and a processor, the memory having stored thereon a computer program operable to, when executed by the processor, implement the steps of the method of controlling an energy storage UPS as claimed in any one of claims 1 to 7.

9. A power supply system comprising the controller of claim 8.

10. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the steps of the method of controlling an energy storage UPS according to any of the preceding claims 1 to 7.