CN116054220A

CN116054220A - Method and device for controlling voltage of transformer area and distributed energy storage equipment

Info

Publication number: CN116054220A
Application number: CN202310085365.8A
Authority: CN
Inventors: 孙运杰; 赵秦; 梁亚琳; 许立; 卫建荣
Original assignee: Xian Linchr New Energy Technology Co Ltd
Current assignee: Xian Linchr New Energy Technology Co Ltd
Priority date: 2023-02-03
Filing date: 2023-02-03
Publication date: 2023-05-02

Abstract

The embodiment of the application provides a method and a device for controlling voltage of a transformer area and distributed energy storage equipment, and relates to the technical field of power control. The method comprises the following steps: acquiring alternating current voltage of an input end of an alternating current load of a preset platform area; determining a power parameter according to the alternating current voltage, the preset target voltage and the line impedance; determining a priority parameter according to the reactive contribution degree and the active contribution degree of the converter equipment relative to the alternating current load; the variable current equipment is variable current equipment of a preset station area; and determining control parameters of the variable current device according to the priority parameters and the power parameters. Therefore, the alternating voltage of the input end of the alternating load of the preset transformer area can be adaptively controlled through the current transformation equipment under the condition that the line impedance of the preset transformer area is unknown.

Description

Method and device for controlling voltage of transformer area and distributed energy storage equipment

Technical Field

The application relates to the technical field of power control, in particular to a method and a device for controlling voltage of a transformer area and distributed energy storage equipment.

Background

With the gradual increase of the power supply radius of the power distribution network in the remote mountain area, the power distribution network has difficult to solve the problems of too fast increase of the load demand of the alternating current load of the preset area, larger load fluctuation, too scattered users, wide access of distributed energy sources and the like, and the line of the power distribution network is easy to dynamically generate overvoltage and low voltage, so that the improvement of the self-adaptive control effect of the alternating current voltage at the input end of the alternating current load of the preset area in the power distribution network is an important subject for the management of the power supply quality of the area.

At present, a distributed energy storage device is added to the input end of the ac load of the preset area in the power distribution network under the condition that the line impedance of the preset area is known to solve the above problem, but no mention is made of how to solve the problem under the condition that the line impedance of the preset area is unknown, so that the self-adaptive control effect of the ac voltage of the input end of the ac load of the preset area is lower under the condition that the line impedance of the preset area in the power distribution network is unknown.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a method and a device for controlling a transformer area voltage and distributed energy storage equipment, so as to solve the problem that in the prior art, under the condition of unknown line impedance of a preset transformer area in a power distribution network, the self-adaptive control effect of alternating current voltage at the input end of an alternating current load of the preset transformer area is lower.

In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

in a first aspect, an embodiment of the present application provides a method for controlling a voltage of a cell, where the method includes:

acquiring alternating current voltage of an input end of an alternating current load of a preset platform area;

determining a power parameter according to the alternating current voltage and a preset target voltage;

Determining a priority parameter according to the reactive contribution degree and the active contribution degree of the converter equipment relative to the alternating current load; the current transformation equipment is the current transformation equipment of the preset station area;

and determining the control parameters of the variable flow equipment according to the priority parameters and the power parameters.

Optionally, the determining the priority parameter according to the reactive contribution degree and the active contribution degree of the converter device relative to the ac load includes:

and determining the priority parameter according to the ratio of the reactive contribution degree to the active contribution degree.

Optionally, the determining the priority parameter according to the ratio of the reactive contribution degree and the active contribution degree includes:

if the ratio is larger than a first preset contribution threshold and smaller than a second preset contribution threshold, determining the priority parameter as a preset equalization coefficient;

the determining the control parameter of the converter device according to the priority parameter and the power parameter includes:

according to the preset equalization coefficient and the power parameter, respectively calculating a reactive power setting parameter and an active power setting parameter;

and determining the reactive power setting parameters and the active power setting parameters as control parameters of the converter equipment.

if the ratio is greater than or equal to the second preset contribution threshold, determining that the priority parameter is a first parameter with reactive priority;

calculating reactive power setting parameters according to the first parameters and the power parameters;

and determining the reactive power setting parameter as a control parameter of the converter equipment.

if the ratio is smaller than or equal to a first preset contribution threshold, determining the priority parameter as a second parameter with active priority;

calculating an active setting parameter according to the second parameter and the power parameter;

and determining the active setting parameters as control parameters of the converter equipment.

Optionally, before determining the priority parameter according to the reactive contribution degree and the active contribution degree of the converter device relative to the ac load, the method further includes:

The variable-current equipment is controlled to perform reactive power adjustment according to a first preset rule, and a first adjusted alternating-current voltage of the alternating-current load and an adjusted reactive power parameter of the variable-current equipment are obtained;

determining the reactive contribution according to the first regulated alternating voltage and the regulated reactive parameter;

and/or

Controlling the current transformation equipment to perform active adjustment according to a second preset rule, and acquiring a second adjusted alternating current voltage of the alternating current load and an adjusted active parameter of the current transformation equipment;

and determining the active contribution degree according to the second regulated alternating voltage and the regulated active parameter.

Optionally, the determining the reactive contribution according to the first regulated ac voltage and the regulated reactive parameter includes:

if the first regulated alternating voltage or the regulated reactive power parameter meets a first preset rule, determining a change value of the reactive power parameter according to the regulated reactive power parameter and the initial reactive power parameter, and determining a change value of the first alternating voltage according to the first regulated alternating voltage and the initial alternating voltage;

calculating the reactive contribution degree according to the change value of the reactive parameter and the change value of the first alternating voltage;

And/or

Said determining said active contribution from said second regulated ac voltage and said regulated active parameter comprises:

if the second regulated alternating voltage or the regulated active parameter meets a second preset rule, determining a change value of a reactive parameter according to the second regulated active parameter and the initial active parameter, and determining a change value of a second alternating voltage according to the second regulated alternating voltage and the initial alternating voltage;

and calculating the active contribution according to the change value of the active power and the change value of the second alternating voltage.

Optionally, the method further comprises:

when the current transformation equipment is electrified and initialized, controlling the current transformation equipment to perform reactive power adjustment according to the first preset rule, and/or controlling the current transformation equipment to perform active power adjustment according to the second preset rule;

or when the preset calibration period of the current transformation equipment is reached, controlling the current transformation equipment to perform reactive power adjustment according to the first preset rule, and/or controlling the current transformation equipment to perform active power adjustment according to the second preset rule.

In a second aspect, an embodiment of the present application further provides a device for controlling a voltage of a station, where the device includes:

The acquisition module is used for acquiring alternating current voltage input by alternating current loads of a preset platform area;

the power module is used for determining the power parameter according to the alternating voltage, a preset target voltage and line impedance;

the priority module is used for determining priority parameters according to the active contribution degree and the reactive contribution degree of the converter equipment relative to the alternating current load; the current transformation equipment is the current transformation equipment of the preset station area;

and the output module is used for determining the control parameters of the variable-current equipment according to the priority parameters and the power parameters.

In a third aspect, embodiments of the present application further provide a distributed energy storage device, the distributed energy storage device including: the system comprises a controller, a converter device and an energy storage device; the controller is in communication connection with the variable-current device and the energy storage device;

the energy storage device is electrically connected with an input end of an alternating current load of a preset station area through the current transformation device, and the controller is used for executing the station area voltage control method according to any one of the first aspect.

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

the embodiment of the application provides a method and a device for controlling the voltage of a platform area and distributed energy storage equipment, wherein the method comprises the steps of firstly obtaining the alternating current voltage of an input end of an alternating current load of a preset platform area; determining a power parameter according to the alternating current voltage, the preset target voltage and the line impedance; then determining a priority parameter according to the reactive contribution degree and the active contribution degree of the converter equipment relative to the alternating current load; the variable current equipment is variable current equipment of a preset station area; and finally, determining the control parameters of the variable current device according to the priority parameters and the power parameters. Therefore, the alternating voltage of the input end of the alternating load of the preset transformer area can be adaptively controlled through the current transformation equipment under the condition that the line impedance of the preset transformer area is unknown.

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 will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an exemplary schematic diagram of a system for controlling a voltage of a platform according to an embodiment of the present application;

fig. 2 is an exemplary schematic diagram of a voltage control vector analysis of a transformer area according to an embodiment of the present application;

fig. 3 is a schematic flow chart of an exemplary method for controlling a voltage of a cell according to an embodiment of the present application;

fig. 4 is an exemplary schematic diagram of a voltage control outer ring structure of a transformer area according to an embodiment of the present application;

fig. 5 is a schematic diagram of an example of determining a priority parameter in a method for controlling a cell voltage according to an embodiment of the present application;

fig. 6 is a schematic diagram two of an example of determining a priority parameter in a method for controlling a cell voltage according to an embodiment of the present application;

fig. 7 is a schematic diagram III of an example of determining priority parameters in a method for controlling a cell voltage according to an embodiment of the present application;

Fig. 8 is a schematic diagram of an example of a flow before determining a priority parameter in a method for controlling a cell voltage according to an embodiment of the present application;

fig. 9 is a schematic diagram two of a flow example before determining a priority parameter in a method for controlling a cell voltage according to an embodiment of the present application;

fig. 10 is a schematic diagram fourth of an example of determining a priority parameter in a method for controlling a cell voltage according to an embodiment of the present application;

fig. 11 is a fifth exemplary schematic diagram of determining a priority parameter in a method for controlling a cell voltage according to an embodiment of the present application;

fig. 12 is a schematic diagram of a simulation waveform of a dual-platform area interconnection system simulation system in a PSIM software environment according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a voltage control device for a transformer area according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a computer device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the accompanying drawings in the present application are only for the purpose of illustration and description, and are not intended to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this application, illustrates operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to the flow diagrams and one or more operations may be removed from the flow diagrams as directed by those skilled in the art.

In addition, the described embodiments are only some, but not all, of the embodiments of the present application. The components of one embodiment of the present application, which are generally described and provided in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the presence of the features stated hereinafter, but not to exclude the addition of other features.

In order to determine that the line impedance of the preset platform is unknown, the adaptive control of the alternating current voltage of the input end of the alternating current load of the preset platform can be realized.

For clarity of description of the method for controlling the voltage of the platform area provided by the embodiment of the application, the distributed energy storage device is described in detail with reference to the accompanying drawings. Fig. 1 is an exemplary schematic diagram of a distributed energy storage device of a platform according to an embodiment of the present application. As shown in fig. 1, the distributed energy storage device 100 includes: a controller 110, a variable current device 120, and an energy storage device 130.

Wherein the distributed energy storage device 100 may absorb power peaks by adjusting the load of the ac load of a preset zone, injecting power when the power supply suddenly decreases, and in-situ energy storage may mitigate power fluctuations caused by renewable energy production output. And because the access position of the distributed energy storage device 100 is flexible, the distributed energy storage device is currently applied to four fields of a medium-low voltage distribution network, distributed power generation, a user side and a micro-grid, wherein the distributed power generation benefits from the development and driving of a new energy industry, and is a main power for pushing an energy storage market.

Further, the energy storage device 130 in the distributed energy storage device 100 may be electrically connected to an input end of an ac load of the preset area through the current transformation device 120, and the controller 110 is respectively in communication connection with the current transformation device 120 and the energy storage device 130, so as to control the current transformation device 120, thereby implementing control of charging and discharging of the energy storage device 130, and implementing adaptive control of an ac voltage of the input end of the ac load of the preset area.

Wherein the energy storage device 130 in the distributed energy storage device 100 is an apparatus that stores electrical energy or other energy sources, which may include: a battery management system 131 (Battery Management System, BMS) and a battery unit 132. Among them, the battery management system 131 is a system that manages batteries.

The current transformation device 120 may control the charging and discharging process of the energy storage device 130, that is, the current transformation device 120 is an energy storage current transformer (Power Conversion System, PCS), wherein the current transformation device 120 may include: an ac-dc conversion unit 121 and a control unit 122.

The controller 110 may be a control unit in the inverter device 120, or may be an additional control unit. The above mentioned communication connection between the controller 110 and the converter device 120 means that the controller 110 performs communication interaction with the ac/dc conversion unit 121 in the converter device 120, so as to control the charging and discharging processes of the ac/dc conversion unit 121, thereby implementing adaptive control of the ac voltage at the input end of the ac load of the preset area.

Further, the communication connection between the controller 110 and the energy storage device 130 means that the controller 110 performs communication interaction with the battery management system 131 in the energy storage device 130, so as to implement adaptive control of the ac voltage at the input end of the ac load of the preset area through management of the battery management system 131.

It should be noted that, in the above embodiment, the controller 110 may be, for example, in communication with the battery management system 131 through a CAN (Controller Area Network, i.e., a controller area network) interface to obtain the state information of the battery unit 132, so as to implement the protective charging and discharging of the energy storage device 130, and ensure the operation safety of the energy storage device 130.

Further, it should be noted that, when the ac voltage U at the input end of the ac load of the preset zone in fig. 1 _g When the change occurs, or the alternating current I of the input end of the alternating load of the preset area _g When the alternating voltage is changed, the alternating voltage U of the alternating load of the preset area is caused _L A change occurs, the change of which is shown in formula (1):

namely U _g -I _L *Z＝U _L Formula (1)

Wherein Z is line impedance, I _L The input end current of the alternating current load of the preset transformer area.

Therefore, it can be seen that if the AC voltage U of the AC load of the transformer area is preset _L When the power supply voltage of the user load is seriously affected due to the change, a distributed energy storage device 100 can be added to the input end of the alternating current load of the preset area, so that the distributed energy storage device 100 serves the alternating current load of the preset area, and the alternating current voltage U of the alternating current load of the preset area is achieved _L In a stable state.

It should be noted that, after the configuration of the distribution network is fixed, the line impedance of the preset area is a certain value, and at this time, the ac current I at the input end of the ac load of the preset area _g The method meets the following conditions: i _g ＝I _L 。

As shown in fig. 1, the current transformation device 120 is electrically connected with an input end of an ac load of a preset transformer area, which not only ensures smoothness of a transformer area voltage control circuit, but also realizes parallel power supply, reduces electric energy loss and improves power supply quality.

Fig. 2 is a schematic diagram of an example of a voltage control vector analysis of a transformer area according to an embodiment of the present application. With continued reference to fig. 1, the ac current I at the input of the ac load of the pre-set bay is known _g (i.e. presetting the alternating current I on the output line of the transformer zone) _g ) Line impedance flowing through the preset zone to generate AC voltage U of AC load of the preset zone _L The line impedance of the preset area is generally divided into a resistor and an inductor, i.e. a resistor R as shown in FIG. 2 _g And an inductance jωL _g 。

At the same time, presetting the alternating current I on the output line of the transformer area _g Can also be decomposed into active current I _Pg And reactive current I _Qg I.e. as shown in fig. 2, the horizontal axis represents the active current I _Pg The vertical axis represents reactive current I _Qg . Wherein the active current I on the horizontal axis _Pg Ac voltage U at input to ac load of preset zone _g In phase, i.e. the horizontal axis as shown in FIG. 2, can represent the active current I _Pg And can represent the AC voltage U of the input end of the AC load of the preset area _g And the phase directions of the two are consistent; reactive current I on the horizontal axis in FIG. 2 _Qg Ac voltage U at input to ac load of preset zone _g The phases are 90 deg. out of phase, i.e. the vertical axis as shown in fig. 2 may represent reactive current I _Qg Ac voltage U at input of ac load of preset zone indicated by horizontal axis _g The phases differ by 90 deg..

As shown in fig. 2, the current vector of the inductive reactive power of the preset zone lags the voltage vector by 90 °, and the current vector of the capacitive reactive power leads the voltage vector by 90 °. The inductive reactive power is that the equipment with induction coils such as a motor or a transformer is in operation, an alternating magnetic field is established, the process of electric and magnetic conversion or the process of electromagnetic energy and mechanical energy conversion is carried out, the absorbed power and the released power in one cycle are equal, and the energy is not consumed actually, and the power is called inductive reactive power; the capacitive reactive power is that in operation of a device with an inductance coil such as a motor or a transformer, the charging power of the upper half cycle and the discharging power of the lower half cycle are equal in one cycle (without considering active loss), and no energy is consumed in practice, and the charging and discharging power is called capacitive reactive power. Thus, inductive reactive power is typically compensated with capacitive reactive power to reduce grid reactive load.

Further, as can be seen from the above known conditions, the active current I at the input end of the ac load of the preset station area _Pg Flow-through resistor R _g An AC voltage U at the input end of the AC load of the preset area is generated _g Same phase; active current I _Pg Through inductance jωL _g An AC voltage U at the input end of the AC load of the preset area is generated _g The phases differ by 90 °; and presetting reactive current I of input end of AC load of transformer area _Qg Through inductance jωL _g An AC voltage U at the input end of the AC load of the preset area is generated _g In phase, reactive current I _Qg Flow-through resistor R _g An AC voltage U at the input end of the AC load of the preset area is generated _g Is 90 deg. out of phase.

Thus, the alternating current I at the input of the alternating load of the pre-set bay _g Voltage U of ac load flowing through preset zone generated by line impedance Z _L The contribution of the variations being different, i.e. the same phase flowing through the resistor R _g The generated voltage I _Pg *R _g Or through an inductance jωL _g The generated voltage I _Qg *ωL _g Which is connected with the alternating voltage U of the input end of the alternating load of the preset area _g The voltage U of the final AC load added to the predetermined area _L The method comprises the steps of carrying out a first treatment on the surface of the And the inductances jωl being 90 ° out of phase _g The generated voltage I _Pg *ωL _g Or through resistor R _g The generated voltage I _Qg *R _g Which is connected with the alternating voltage U of the input end of the alternating load of the preset area _g Is the vector sum of the ac voltages U of the final ac load of the predetermined area _L . It can thus also be seen that the ac voltage U of the ac load of the predetermined bay, which is generated in phase _L The change is obviously larger than the alternating voltage U which is 90 degrees out of phase to generate alternating load _L And (3) a change.

For example, assume that the ac voltage U at the input of the ac load of the transformer area is preset _g =220V, presetting the resistance R in the line impedance of the bay _g =0.5 ohm, inductance in line impedance jωl _g Equivalent to an impedance of 0.5ohm, the active current I flowing through the input of the AC load of the preset zone _Pg Reactive current I at input of ac load flowing through preset zone and =100deg.A _Qg Voltage U of ac load of =100deg.A _L The following table shows:

/>

as can be seen from the above table, when the line impedance of the preset zone is unknown, the active current I of the input end of the ac load of the preset zone _Pg And reactive current I _Qg Voltage U to AC load _L The power contribution of the variation is greatly different, namely the active current I is shown in the table _Pg And reactive current I _Qg Ac voltage U to ac load _L The power contributions of the variations differ by a factor of 8. Therefore, it is necessary to determine the power contribution of the input end of the ac load of the preset area, and then select whether reactive control or active control is adopted.

The control method executed by the controller in the zone voltage control system provided in the above embodiment of the present application is explained and described in detail below with reference to the accompanying drawings. Fig. 3 is a schematic flowchart of an exemplary method for controlling a cell voltage according to an embodiment of the present application. The method for controlling the voltage of the platform region provided by the embodiments below can be implemented by a computer device, and for example, the control function of the computer device can be integrated with a controller in the distributed energy storage device in advance, so that the control of the alternating voltage of the input end of the alternating load of the preset platform region is implemented by executing the method for controlling the voltage of the platform region. As shown in fig. 3, the method includes:

s301, acquiring an alternating voltage of an input end of an alternating load of a preset transformer area.

Specifically, as shown in fig. 1, the ac voltage at the input end of the ac load of the preset zone is obtained by obtaining the ac voltage U on the output line of the transformer of the preset zone _{g_back} . For example, the ac voltage U may be obtained by direct sampling of the ac voltage and conversion by the controller 110 in the distributed energy storage device 100 _{g_back} Or directly obtain the alternating voltage U by means of a voltage transmitter and the like _{g_back} Without limitation, those skilled in the art may choose according to the actual circumstances.

S302, determining a power parameter according to the alternating voltage, the preset target voltage and the line impedance.

In order to clearly describe the calculation process of the power parameter in the method for controlling the cell voltage provided by the embodiment of the application, the calculation process is described in detail with reference to the accompanying drawings. Fig. 4 is an exemplary schematic diagram of a region voltage control outer ring structure according to an embodiment of the present application.

In the example of fig. 4, the zone voltage control outer loop structure 400 includes: AC voltage U _{g_back} And a preset target voltage U _{g_ref} A comparator 410, a PI regulator 420 and a line impedance 430. If the outer ring structure 400 for the voltage control of the transformer area can obtain the line impedance 430, the line impedance 430 is an actual value, and if the outer ring structure 400 for the voltage control of the transformer area cannot obtain the line impedance 430, the line impedance 430 is a set value (e.g., the line impedance 430 is 1 ohm).

With continued reference to FIG. 1, a target voltage U is preset _{g_ref} Ac voltage U for ac load of preset zone _L The method comprises the steps of carrying out a first treatment on the surface of the After executing the step S301, the ac voltage U at the input end of the ac load of the preset zone can be obtained _{g_back} The alternating voltage U is supplied by the comparator 410 _{g_back} And a preset target voltage U _{g_ref} Comparing the voltage values to determine the AC voltage U _{g_back} Whether or not the preset target voltage U is satisfied _{g_ref} Then, the comparison result of the comparator 410 is input into the PI regulator 420 for correction and adjustment, so that the performance of the outer loop structure 400 is stable, and the power parameter S on the output line of the outer loop structure 400 is determined _{v_set} 。

It should be noted that, the power parameter S on the output line of the outer ring structure 400 is controlled by the cell voltage _{v_set} The power representation may be set visually to represent the product of the effective voltage value and the effective current value of the output line of the cell voltage control outer loop structure 400.

And S303, determining a priority parameter according to the reactive contribution degree and the active contribution degree of the converter equipment relative to the alternating current load.

The current transformation equipment is current transformation equipment of a preset platform area.

Specifically, the reactive contribution QZ is used for indicating the ac voltage U of the reactive power Q output by the converter device of the preset zone through the input end of the ac load of the preset zone _{g_back} Contribution of (3). The active contribution PZ can indicate the AC voltage U of the active power P output by the current transformer of the preset area through the input end of the AC load of the preset area _{g_back} Contribution of (3).

In a possible implementation, the ac voltage U of the reactive power Q and the active power P at the input to the ac load of the predetermined bay can be determined from the reactive contribution QZ and the active contribution PZ _{g_back} Priority in the control process is performed. Wherein the priority parameter can be used for indicating the control mode of the converter device to control the AC voltage U at the input end of the AC load of the preset station area _{g_back} 。

S304, determining control parameters of the variable flow equipment according to the priority parameters and the power parameters.

In particular, a control mode for the converter device may be determined based on the priority parameter, and then based on the control mode, and the power parameter S of the output line _{v_set} The control mode is adopted to control the converter equipment so as to control the alternating current voltage U of the input end of the alternating current load of the preset transformer area _{g_back} Adjusting to realize the alternating voltage U of the input end of the alternating load of the preset area in the power distribution network under the condition that the line impedance of the preset area is unknown _{g_back} Is provided.

It should be noted that the transformer of the preset area in the present application may be connected to another preset area, and the control parameter of the other preset area may be used to control the ac voltage U of the input end of the ac load of the preset area _{g_back} And performing compensation adjustment. The present invention is not limited thereto, and may be selected according to practical circumstances.

In summary, in the method for controlling the voltage of the transformer area provided in the embodiments of the present application, the ac voltage of the input end of the ac load of the preset transformer area may be obtained first; determining a power parameter according to the alternating current voltage, the preset target voltage and the line impedance; then determining a priority parameter according to the reactive contribution degree and the active contribution degree of the converter equipment relative to the alternating current load; the variable current equipment is variable current equipment of a preset station area; and finally, determining the control parameters of the variable current device according to the priority parameters and the power parameters. Therefore, the priority parameter of the preset transformer area can be determined according to the reactive contribution degree and the active contribution degree of the current transformation equipment relative to the alternating current load under the condition that the line impedance of the preset transformer area is unknown, and then the alternating current voltage of the input end of the alternating current load of the preset transformer area is adaptively controlled through the current transformation equipment according to the priority parameter and the power parameter.

On the basis of the method for controlling the cell voltage provided in the above embodiment, the following further illustrates possible implementation manners for determining the priority parameter through a plurality of embodiments. Optionally, in some embodiments of the present application, determining the priority parameter according to the reactive contribution and the active contribution of the converter device to the ac load may include:

And determining a priority parameter according to the ratio of the reactive contribution degree to the active contribution degree.

Specifically, the comparison of the reactive contribution degree QZ and the active contribution degree PZ can be performed to obtain a comparison magnitude relation by comparing the comparison value with a preset contribution degree threshold value, and the corresponding relation between the comparison magnitude relation and the priority parameter is adopted according to the comparison magnitude relation, so that the priority parameter is determined.

It should be noted that, in the embodiment of the ratio of the reactive contribution degree to the active contribution degree, the ratio obtained by the reactive contribution degree QZ to the active contribution degree PZ is used to indicate the effect of the power contribution degree in the case of unknown line impedance of the preset area.

The following description is continued with reference to a plurality of examples of possible implementation manners of determining the priority parameter, and fig. 5 is a schematic diagram first of an example of determining the priority parameter in a method for controlling a cell voltage according to an embodiment of the present application. As shown in fig. 5, determining the priority parameter according to the ratio of the reactive contribution degree to the active contribution degree in the above method may include:

s501, judging whether the ratio is larger than a first preset contribution threshold and smaller than a second preset contribution threshold. If yes, step S502 is executed.

The first preset contribution degree threshold value and the second preset contribution degree threshold value may be set according to actual situations, and are not limited herein. If the first preset contribution threshold is 0.8, the second preset contribution threshold is 1.2.

S502, determining the priority parameter as a preset equalization coefficient.

The preset equalization coefficient is any value of the first preset contribution threshold and the second preset contribution threshold, such as any preset value between 0.8 and 1.2.

Specifically, the preset equalization coefficient may be used to indicate that the reactive power Q control is performed on the converter device and the active power P control is performed on the converter device, that is, within the preset equalization coefficient, the reactive power Q control and the active power P control are half of each other.

Accordingly, e.g.According to the priority parameter and the power parameter S shown above _{v_set} Determining control parameters of the variable flow device may include:

s503, respectively calculating an active setting parameter and a reactive setting parameter according to a preset balance coefficient and a power parameter.

Specifically, as can be seen from fig. 4, the power parameter S on the output line of the outer ring structure 400 is controlled by the cell voltage _{v_set} Can be represented by an apparent set power, and the apparent set power S _{v_set} And an active set parameter P _{out_set} And reactive power setting parameter Q _{out_set} There is a relationship of trigonometric functions, S _{v_set} ² ＝P _{out_set} ² +Q _{out_set} ² 。

At this time, the calculated active setting parameter P _{out_set} And reactive power setting parameter Q _{out_set} All satisfy the preset value of the preset equalization coefficient.

I.e. the active set parameter P _{out_set} Square sum reactive power setting parameter Q _{out_set} The squares of the power S are all apparent settings _{v_set} Half of the square.

S504, determining reactive power setting parameters and active power setting parameters as control parameters of the converter equipment.

Specifically, the active set parameter P identified in accordance with the above step S503 _{out_set} And reactive power setting parameter Q _{out_set} Reactive power Q control and active power P control are respectively carried out on the converter equipment so as to carry out alternating current voltage U of the input end of an alternating current load of a preset transformer area _{g_back} Adjusting to realize the alternating voltage U of the input end of the alternating load of the preset area in the power distribution network under the condition of unknown line impedance of the preset area _{g_back} Is provided. Wherein, the reactive power parameters and the active parameters of the current transformation equipment are controlled, and the current transformation equipment can be controlled by reactive power Q and/or active power P, and can also be controlled by reactive current I _Qg Control and/or active current I _Pg Control, here, is not limited, and may be specifically selected according to actual conditions. In addition, the following will be made clearDescription of controlling reactive and active parameters of the converter device for regulating the ac voltage, respectively, wherein the reactive and active parameters of the converter device are controlled mainly by reactive current I _Qg Control and/or active current I _Pg Control is not described in detail later.

It should be noted that, the value of the contribution threshold in the above embodiment should not be construed as limiting the present application. In other examples or embodiments or examples, which may be selected in accordance with the present application, are not specifically limited herein.

According to the method for controlling the voltage of the transformer area, the ratio of the reactive contribution degree to the active contribution degree is larger than the first preset contribution degree threshold and smaller than the second preset contribution degree threshold, if the ratio of the reactive contribution degree to the active contribution degree is larger than the first preset contribution degree threshold and smaller than the second preset contribution degree threshold, the priority parameter is determined to be a preset balance coefficient, and the control parameter of the converter equipment is determined according to the priority parameter and the power parameter, wherein the method comprises the following steps: and respectively calculating reactive power setting parameters and active power setting parameters, finally determining the reactive power setting parameters and the active power setting parameters as control parameters of the converter equipment, respectively controlling the active power parameters and the reactive power parameters of the converter equipment to regulate alternating voltage, further determining a preset balance coefficient of alternating voltage control of an input end of an alternating current load of the preset area according to the reactive power contribution degree and the active power contribution degree of the preset area in the power distribution network under the condition that the line impedance of the preset area is unknown, and then carrying out self-adaptive control on the alternating voltage of the input end of the alternating current load of the preset area in the power distribution network through the converter equipment according to the preset balance coefficient and the power parameters.

The following description is continued with reference to a plurality of examples of possible implementation manners for determining the priority parameter, and fig. 6 is a schematic diagram two of an example for determining the priority parameter in the method for controlling a cell voltage according to the embodiment of the present application. As shown in fig. 6, determining the priority parameter according to the ratio of the reactive contribution degree to the active contribution degree in the above method may include:

s601, judging whether the ratio is larger than or equal to a second preset contribution threshold. If yes, step S602 is executed.

For example, when it is determined that the ratio of the reactive contribution degree to the active contribution degree is greater than or equal to the second preset contribution degree threshold (e.g., 1.2), step S602 is performed.

S602, determining the priority parameter as a first parameter of reactive priority.

Wherein the reactive priority first parameter can be used for indicating reactive power Q control and/or reactive current I of the converter device _Qg And (5) controlling.

That is, outside the preset equalization coefficient, the contribution of the reactive contribution QZ is greater than the active contribution PZ, which may be used to indicate reactive power Q control and/or reactive current I to the converter device _Qg And (5) controlling.

Accordingly, determining the control parameters of the variable current device according to the priority parameters and the power parameters as described above may include:

s603, calculating reactive power setting parameters according to the first parameters and the power parameters.

Specifically, as can be seen from fig. 4, the power parameter S on the output line of the outer ring structure 400 is controlled by the cell voltage _{v_set} Can be represented by an apparent set power, when the first parameter is reactive priority, the apparent set power S _{v_set} And an active set parameter P _{out_set} And reactive power setting parameter Q _{out_set} The relationship of the trigonometric function between them becomes S _{v_set} ² ＝Q _{out_set} ² 。

At this time, the calculated reactive power setting parameter Q _{out_set} I.e. power parameter S _{v_set} And satisfies a preset value of a preset equalization coefficient of the reactive priority first parameter.

S604, determining reactive power setting parameters as control parameters of the converter equipment.

Specifically, the reactive power setting parameter Q confirmed according to the above step S603 _{out_set} Reactive power Q control is carried out on the converter equipment so as to carry out alternating current voltage U of the input end of alternating current load of a preset transformer area _{g_back} And adjusting the AC load so as to realize the self-adaptive control of the AC voltage at the input end of the AC load of the preset station in the power distribution network under the condition of unknown line impedance of the preset station area.

According to the method for controlling the transformer area voltage, the reactive contribution degree and the active contribution degree are judged to be larger than or equal to the second preset contribution degree threshold, if the reactive contribution degree and the active contribution degree are larger than or equal to the second preset contribution degree threshold, the priority parameter is determined to be the first parameter with reactive priority, the reactive setting parameter is calculated according to the first parameter and the power parameter, the reactive setting parameter is finally determined to be the control parameter of the current transformer equipment, the reactive parameter of the current transformer equipment is controlled to regulate the alternating voltage, and then under the condition that the line impedance of the preset transformer area is unknown, the first parameter with reactive priority of the alternating voltage control of the input end of the alternating current load of the preset transformer area in the power distribution network is determined according to the reactive contribution degree of the output line of the transformer of the preset transformer area in the power distribution network, and then the alternating voltage of the input end of the alternating current load of the preset transformer area in the power distribution network is adaptively controlled through the current equipment according to the first parameter with the reactive priority.

The following description is continued with reference to a plurality of examples for possible implementation manners of determining the priority parameter, and fig. 7 is a schematic diagram three of an example of determining the priority parameter in the method for controlling a cell voltage according to the embodiment of the present application. As shown in fig. 7, determining the priority parameter according to the ratio of the reactive contribution degree to the active contribution degree in the above method includes:

S701, judging whether the ratio is smaller than or equal to a first preset contribution threshold. If yes, go to step S702.

For example, when it is determined that the ratio of the reactive contribution degree and the active contribution degree is less than or equal to the first preset contribution degree threshold (e.g., 0.8), step S602 is performed.

S702, determining the priority parameter as a second parameter of active priority.

Wherein the second parameter of active priority can be used for indicating active power Pcontrol and/or active current I of the converter device _Pg And (5) controlling.

That is, outside the preset equalization coefficient, the contribution of the active contribution PZ is greater than the reactive contribution QZ, which can be used to indicate active power P control and/or active current I to the converter device _Pg And (5) controlling.

s703, calculating an active setting parameter according to the second parameter and the power parameter.

Specifically, as can be seen from fig. 4, the power parameter S on the output line of the outer ring structure 400 is controlled by the cell voltage _{v_set} Can be represented by an apparent set power, when the first parameter is reactive priority, the apparent set power S _{v_set} And an active set parameter P _{out_set} And reactive power setting parameter Q _{out_set} The relationship of the trigonometric function between them becomes S _{v_set} ² ＝P _{out_set} ² 。

At this time, the calculated active setting parameter P of the output line _{out_set} I.e. power parameter S _{v_set} And satisfies a preset value of the second parameter of the active priority.

S704, determining the active setting parameters as control parameters of the converter equipment.

Specifically, the active set parameter P identified in accordance with the above step S703 _{out_set} Active power P control is performed on the converter device to control the alternating current voltage U at the input end of the alternating current load _{g_back} Adjusting to realize distribution under the condition of unknown line impedance of preset areaAnd (3) adaptively controlling the alternating current voltage of the input end of the alternating current load of a preset area in the power grid.

According to the method for controlling the transformer area voltage, whether the ratio of the reactive contribution degree to the active contribution degree is smaller than or equal to the first preset contribution degree threshold value can be judged, if the ratio of the reactive contribution degree to the active contribution degree is smaller than or equal to the first preset contribution degree threshold value, the priority parameter is determined to be the second parameter with active priority, the active setting parameter is calculated according to the second parameter and the power parameter, finally the active setting parameter is determined to be the control parameter of the current transformer equipment, the active parameter of the current transformer equipment is controlled to regulate the alternating current voltage, and then under the condition that the line impedance of the preset transformer area is unknown, the active priority second parameter of the alternating current voltage control of the alternating current load of the preset transformer area in the power distribution network is determined according to the active contribution degree on the output line of the transformer of the preset transformer area in the power distribution network, and then the alternating current voltage of the alternating current load of the preset transformer area in the power distribution network is adaptively controlled through the current transformer equipment according to the active priority second parameter.

The possible implementations before determining the priority parameters are explained and illustrated in detail in the following in connection with several examples. Fig. 8 is a schematic diagram of an example of a flow before determining a priority parameter in a method for controlling a cell voltage according to an embodiment of the present application. As shown in fig. 8, before determining the priority parameter according to the reactive contribution degree and the active contribution degree of the converter device relative to the ac load, the method further includes:

s801, controlling the converter equipment to perform reactive power regulation according to a first preset rule.

The first preset rule is a ratio of a preset reactive contribution QZ to a preset active contribution PZ calculated in a first preset mode, and a condition of a preset priority parameter is determined.

Specifically, taking reactive power adjustment as an example, when the first preset rule is satisfied, reactive power Q control adjustment is performed on the converter device, that is, at this time, the contribution degree of reactive contribution degree QZ is greater than the active contribution degree PZ, and the reactive power Q control adjustment is performed on the preset tableAc voltage U at the input of the ac load of the field _{g_back} And adjusting the alternating current load so as to realize the self-adaptive control of the alternating current voltage of the input end of the alternating current load of the preset transformer area in the power distribution network under the condition that the line impedance of the preset transformer area is unknown.

S802, acquiring a first regulated alternating voltage of an alternating load and a regulated reactive parameter of the converter equipment.

The first regulated AC voltage of the AC load is obtained by obtaining the AC voltage U of the input end of the AC load of the preset area _{g_back} Target voltage U of regulated alternating current load of preset transformer area _L The method comprises the steps of carrying out a first treatment on the surface of the The reactive power parameters after adjustment of the current transformation equipment are obtained by obtaining reactive power current I of an input end of an alternating current load of a preset area corresponding to the current transformation equipment _Qg Generated reactive power Q ₁ 。

S803, determining reactive contribution degree according to the first regulated alternating voltage and the regulated reactive power parameter.

Specifically, the first regulated ac voltage U is determined according to step S802 described above _L And regulated reactive power Q ₁ And determining the reactive contribution QZ. As shown in formula (2):

wherein Q is reactive current I of an input end of an alternating current load of a preset transformer area corresponding to the current transformation equipment _Qg The initial reactive power generated.

According to the method for controlling the voltage of the transformer area, reactive power adjustment can be performed according to the first preset rule by controlling the current transformation equipment, and the first adjusted alternating voltage of the alternating load and the adjusted reactive power parameter of the current transformation equipment are obtained; and finally, determining reactive contribution degree according to the first regulated alternating current voltage and the regulated reactive power parameter, and further determining reactive contribution degree of alternating current voltage control of the input end of the alternating current load of the preset area in the power distribution network according to the alternating current voltage and the reactive power parameter of the input end of the alternating current load of the preset area under the condition that the line impedance of the preset area is unknown, and further carrying out self-adaptive control on the alternating current voltage of the input end of the alternating current load of the preset area in the power distribution network through the converter equipment.

An exemplary schematic diagram of a process before determining the priority parameter in the method for controlling the cell voltage is also provided below. Fig. 9 is a schematic diagram of a second flowchart before determining a priority parameter in a method for controlling a cell voltage according to an embodiment of the present application. As shown in fig. 9, before determining the priority parameter according to the reactive contribution degree and the active contribution degree of the converter device relative to the ac load in the above method, the method further includes:

and S901, controlling the variable current device to perform active adjustment according to a second preset rule.

The second preset rule is a ratio of a second preset calculated preset reactive contribution degree QZ to a preset active contribution degree PZ, and a preset priority parameter condition is determined.

Specifically, taking active power adjustment as an example, when the second preset rule is satisfied, active power P control adjustment is performed on the converter device, that is, at this time, the contribution of the active contribution PZ is greater than the reactive contribution QZ, and the ac voltage U at the input end of the ac load of the preset transformer area _{g_back} And adjusting the AC voltage of the input end of the AC load of the preset area in the power distribution network under the condition of unknown line impedance of the preset area.

S902, acquiring a second regulated alternating voltage of the alternating load and regulated active parameters of the converter equipment.

The second regulated AC voltage of the AC load is obtained by obtaining the AC voltage U of the input end of the AC load of the preset area _{g_back} Target voltage U of regulated alternating current load of preset transformer area _L The method comprises the steps of carrying out a first treatment on the surface of the The reactive power parameters after adjustment of the current transformation equipment are obtained by obtaining the active current I of the input end of the alternating current load of the preset transformer area corresponding to the current transformation equipment _Pg Active power P generated ₂ 。

S903, determining the active contribution degree according to the second regulated alternating voltage and the regulated active parameter.

Specifically, the second regulated ac voltage U identified in accordance with step S902 described above _L And regulated active power P ₂ And determining the active contribution degree PZ. As shown in formula (3):

wherein P is the active current I of the input end of the alternating current load of the preset transformer area corresponding to the current transformation equipment _Pg The initial active power generated.

According to the method for controlling the voltage of the transformer area, active adjustment can be performed according to the second preset rule by controlling the current transformation equipment, and the second adjusted alternating current voltage of the alternating current load and the adjusted active parameter of the current transformation equipment are obtained; and finally, determining the active contribution degree according to the second regulated alternating current voltage and the regulated active parameter, and further determining the active contribution degree of alternating current voltage control of the input end of the alternating current load of the preset area in the power distribution network according to the alternating current voltage and the active parameter of the input end of the alternating current load of the preset area under the condition that the line impedance of the preset area is unknown, and further carrying out self-adaptive control on the alternating current voltage of the input end of the alternating current load of the preset area in the power distribution network through the converter equipment.

The possible implementations before determining the priority parameters are explained and illustrated in detail in the following in connection with several examples. Fig. 10 is a schematic diagram fourth of an example of determining priority parameters in a method for controlling a cell voltage according to an embodiment of the present application. As shown in fig. 10, determining the reactive contribution according to the first regulated ac voltage and the regulated reactive parameter in the above method may include:

s1001, judging whether the first regulated alternating voltage or the regulated reactive power parameter meets a first preset rule. If yes, step S1002 is executed.

Wherein the first preset rule is a first regulated AC voltage U _L Rated voltage Ue greater than 7% or regulated reactive power Q ₁ Up to 90%Is set to the rated reactive power Qe.

For example, when the first regulated AC voltage U is determined _L Rated voltage Ue greater than 7% or regulated reactive power Q ₁ When 90% of the rated reactive power Qe is reached, step S1002 is performed.

S1002, determining a change value of the reactive power parameter according to the adjusted reactive power parameter and the initial reactive power parameter, and determining a change value of the first alternating voltage according to the first adjusted alternating voltage and the initial alternating voltage.

The initial reactive power parameter is reactive power Q of an input end of an alternating current load of a preset transformer area before adjustment; the initial AC voltage is the AC voltage U of the input end of the AC load of the preset area before adjustment _{g_back} 。

Specifically, taking reactive power as an example, calculating the regulated reactive power Q ₁ The difference value with the initial reactive power Q to determine the variation value delta Q of the reactive parameter, and calculate the first regulated alternating voltage U _L With initial alternating voltage U _{g_back} Determining the variation DeltaU of the first alternating voltage _{g_back} 。

And S1003, calculating reactive contribution degree according to the change value of the reactive parameter and the change value of the first alternating voltage.

Specifically, the change value DeltaQ of the reactive parameter and the change value DeltaU of the first alternating voltage are used for _{g_back} And further determining the reactive contribution QZ, as shown in a formula (4):

from this, it is understood that the reactive contribution degree QZ decreases with an increase in the variation value Δq of the reactive parameter, and the reactive contribution degree QZ decreases with the variation value Δu of the first ac voltage _{g_back} Is increased by an increase in (a).

According to the method for controlling the transformer area voltage, whether the first adjusted alternating current voltage or the adjusted reactive power parameter meets the first preset rule can be judged, if the first adjusted alternating current voltage or the adjusted reactive power parameter meets the first preset rule, the change value of the reactive power parameter is determined according to the adjusted reactive power parameter and the initial reactive power parameter, the change value of the first alternating current voltage is determined according to the first adjusted alternating current voltage, then the reactive power contribution degree is calculated according to the change value of the reactive power parameter and the change value of the first alternating current voltage, and further under the condition that the line impedance of the preset transformer area is unknown, the reactive power contribution degree of alternating current voltage control of the input end of the alternating current load of the preset transformer area is determined according to the change value of the reactive power parameter and the change value of the first alternating current voltage of the input end of the alternating current load of the preset transformer area, and the alternating current voltage of the alternating current load of the preset transformer area is adaptively controlled through the current equipment.

An exemplary schematic diagram for determining priority parameters in a method for controlling a cell voltage is also provided below. Fig. 11 is a fifth exemplary schematic diagram of determining a priority parameter in a method for controlling a cell voltage according to an embodiment of the present application. As shown in fig. 11, determining the active contribution according to the second regulated ac voltage and the regulated active parameter in the above method may include:

and S1101, judging whether the second regulated alternating voltage or the regulated active parameter meets a second preset rule. If yes, step S1102 is executed.

Wherein the second preset rule is a second regulated AC voltage U _L Rated voltage Ue greater than 7% or regulated active power P ₂ Reaching 90% of rated active power Pe.

For example, when the second regulated AC voltage U is determined _L Rated voltage Ue greater than 7% or regulated active power P ₂ When 90% of the rated active power Pe is reached, step S1102 is performed.

S1102, determining a change value of the reactive power parameter according to the second adjusted active parameter and the initial active parameter, and determining a change value of the second alternating voltage according to the second adjusted alternating voltage and the initial alternating voltage.

The initial active parameter is the active power P of the input end of the alternating current load of the preset platform area before adjustment; the initial AC voltage being regulated Ac voltage U at the input of the ac load of the preceding pre-set bay _{g_back} 。

Specifically, taking the active parameter as active power as an example, calculating the adjusted active power P ₂ The difference value with the initial active power P, the change value delta P of the active parameter is determined, and the second regulated alternating voltage U is calculated _L With initial alternating voltage U _{g_back} And determining the variation DeltaU of the second alternating voltage _{g_back} 。

And S1103, calculating the active contribution degree according to the change value of the active parameter and the change value of the second alternating voltage.

According to the change value delta P of the active parameter and the change value delta U of the second alternating voltage _{g_back} And further determining the active contribution degree PZ, as shown in a formula (5):

from this, it is understood that the unit active contribution degree PZ decreases with an increase in the variation value Δp of the active parameter, and the unit active contribution degree PZ decreases with the variation value Δu of the second ac voltage _{g_back} Is increased by an increase in (a).

According to the transformer area voltage control method, whether the second regulated alternating current voltage or the regulated active parameter meets the second preset rule can be judged, if the second regulated alternating current voltage or the regulated active parameter meets the second preset rule, the change value of the reactive parameter is determined according to the second regulated active parameter and the initial active parameter, the change value of the second alternating current voltage is determined according to the second regulated alternating current voltage and the initial alternating current voltage, then the active contribution degree is calculated according to the change value of the active parameter and the change value of the second alternating current voltage, and further under the condition that the line impedance of the preset transformer area is unknown, the active contribution degree of alternating current voltage control of the input end of the alternating current load of the preset transformer area is determined according to the change value of the active parameter and the change value of the second alternating current voltage of the alternating current load of the preset transformer area, and the alternating current voltage of the input end of the alternating current load of the preset transformer area in the power distribution network is adaptively controlled through the current equipment.

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

when the current transformation equipment is electrified and initialized, the current transformation equipment is controlled to perform reactive power adjustment according to a first preset rule, and/or the current transformation equipment is controlled to perform active power adjustment according to a second preset rule;

or when the preset calibration period of the current transformation equipment is reached, controlling the current transformation equipment to perform reactive power regulation according to a first preset rule, and/or controlling the current transformation equipment to perform active power regulation according to a second preset rule.

Specifically, before reactive power adjustment is performed on the converter device, power-on initialization is performed on the converter device, for example, an initialization flow of a main function in the converter device (such as an energy storage converter) is operated, the converter device is further controlled to perform reactive power adjustment according to a first preset rule, a preset reactive power contribution QZ is calculated, and/or the converter device is controlled to perform active power adjustment according to a second preset rule, a preset active power contribution PZ is calculated, and finally a preset priority parameter is determined.

Or when the preset calibration period of the current transformer equipment is reached, if the preset calibration period of the current transformer equipment is 3 months for 1 time, triggering a preset rule when the preset calibration period is reached. Therefore, whether the line transformation of the alternating current voltage at the input end of the alternating current load of the preset station area or the equipment outage is carried out, the active contribution degree PZ or the reactive contribution degree QZ of the preset station area can be calculated, the priority parameter of the preset station area is determined, the self-adaptive control of the alternating current voltage at the input end of the alternating current load of the preset station area is realized under the condition that the line impedance of the preset station area is unknown.

Fig. 12 is a schematic diagram of an example simulation waveform of a dual-platform area interconnection system simulation system in a PSIM software environment according to an embodiment of the present application. As shown in fig. 12, when the load voltage starts to decay after the start-up voltage is controlled for a preset time (e.g., 0.4S), the load power is suddenly changed to 11KW, but the PCS power is unchanged; when the load voltage is controlled for a preset time (such as 1S) at the starting voltage, the load power and the PCS power are changed, wherein the load power starts to rise, and the PCS power starts to decay, so that the load voltage is effectively supported; when the load voltage is controlled for a preset time (such as 1.5S) at the start voltage, the power grid voltage starts to suddenly change, namely, the power grid voltage starts to decay, and then the PCS power also has suddenly change in decay. And then the load voltage is adaptively controlled through the power grid voltage.

Based on the same inventive concept, the embodiment of the present application further provides a device for controlling a cell voltage, and since the principle of solving the problem by the device in the embodiment of the present application is similar to that of the method for controlling a cell voltage in the embodiment of the present application, the implementation of the device may refer to the implementation of the method, and the repetition is omitted.

Fig. 13 is a schematic structural diagram of a voltage control device for a transformer area according to an embodiment of the present application. As shown in fig. 13, the bay voltage control apparatus 1300 includes:

an acquisition module 1301, configured to acquire an ac voltage at an input end of an ac load of a preset area;

a power module 1302 for determining a power parameter according to the ac voltage, the preset target voltage, and the line impedance;

the priority module 1303 is configured to determine a priority parameter according to a reactive contribution degree and an active contribution degree of the converter device relative to the ac load; the variable current equipment is variable current equipment of a preset station area;

and an output module 1304, configured to determine a control parameter of the variable current device according to the priority parameter and the power parameter.

In an alternative embodiment, the priority module 1303 is specifically configured to:

and determining a priority parameter according to the ratio of the active contribution degree to the reactive contribution degree.

if the ratio is larger than the first preset contribution threshold and smaller than the second preset contribution threshold, determining the priority parameter as a preset equalization coefficient;

determining control parameters of the converter equipment according to the priority parameters and the power parameters, wherein the control parameters comprise:

Respectively calculating an active setting parameter and a reactive setting parameter according to a preset balance coefficient and a power parameter;

and determining reactive power setting parameters and active power setting parameters as control parameters of the converter equipment.

if the ratio is greater than or equal to a second preset contribution threshold, determining that the priority parameter is a first parameter of reactive priority;

determining control parameters of the variable current device according to the priority parameters and the power parameters, wherein the control parameters comprise:

if the ratio is smaller than or equal to the first preset contribution threshold, determining that the priority parameter is a second parameter with active priority;

In an alternative embodiment, the power module 1302 is further configured to:

The method comprises the steps of controlling the converter device to perform reactive power regulation according to a first preset rule, and obtaining a first regulated alternating voltage of an alternating load and a regulated reactive power parameter of the converter device;

determining reactive contribution according to the first regulated alternating voltage and the regulated reactive parameter;

and/or

The variable current device is controlled to perform active adjustment according to a second preset rule, and second adjusted alternating current voltage of the alternating current load and adjusted active parameters of the variable current device are obtained;

In an alternative embodiment, the power module 1302 is further configured to:

calculating reactive contribution according to the change value of the reactive parameter and the change value of the first alternating voltage;

and/or

Determining an active contribution from the second regulated ac voltage and the regulated active parameter, comprising:

if the second regulated alternating voltage or the regulated active parameter meets a second preset rule, determining a change value of the active parameter according to the regulated active parameter and the initial active parameter, and determining a change value of the second alternating voltage according to the second regulated alternating voltage and the initial alternating voltage;

And calculating the active contribution degree according to the change value of the active parameter and the change value of the second alternating voltage.

In an alternative embodiment, the output module 1304 is further configured to:

It should be noted that, for details not disclosed in the voltage control device for a cell in the embodiment of the present application, please refer to details disclosed in the voltage control method for a cell in the embodiment of the present application, and detailed descriptions thereof are omitted here.

The above modules may be one or more integrated circuits configured to implement the above methods, for example: one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASICs), or one or more microprocessors, or one or more field programmable gate arrays (Field Programmable Gate Array, abbreviated as FPGAs), etc. For another example, when a module above 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 (Central Processing Unit, CPU) or other processor that may invoke the program code. For another example, the modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

Fig. 14 is a schematic structural diagram of a computer device according to an embodiment of the present application, as shown in fig. 8, where the computer device 1400 may include: processor 1401, memory 1402 and bus, memory 1402 stores machine-readable instructions executable by processor 1401, which when the computer device is running, are executed, processor 1401 and memory 1402 communicate with each other via the bus, and processor 1401 is configured to execute the steps of the method for controlling a cell voltage in the above-described embodiment.

The memory 1402, the processor 1401, and the bus are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The removable storage includes at least one software functional module that may be stored in memory 1402 in the form of software or firmware (firmware) or cured in the Operating System (OS) of the computer device. The processor 1401 is configured to execute executable modules stored in the memory 1402, such as software functional modules and computer programs included in a land voltage control method of a mobile storage medium.

The Memory 1402 may be, but is not limited to, a random access Memory (Random Access Memory, RAM), a Read Only Memory (ROM), a programmable Read Only Memory (Programmable Read-Only Memory, PROM), an erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), an electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc.

Optionally, the embodiment of the present application further provides a computer readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the processor executes the steps of the method for controlling the area voltage of the mobile storage medium in the above embodiment. The specific implementation manner and the technical effect are similar, and are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function 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 with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

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 on 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 each embodiment 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 hardware plus software functional units.

The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (english: processor) to perform part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: u disk, mobile hard disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are covered by the protection 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 for controlling a cell voltage, the method comprising:

determining a power parameter according to the alternating voltage, a preset target voltage and line impedance;

2. The method for controlling the voltage of the transformer area according to claim 1, wherein determining the priority parameter according to the reactive contribution and the active contribution of the converter device to the ac load comprises:

3. The method according to claim 2, wherein the determining the priority parameter according to a ratio of the reactive contribution and the active contribution includes:

4. The method according to claim 2, wherein the determining the priority parameter according to a ratio of the reactive contribution and the active contribution includes:

5. The method according to claim 2, wherein the determining the priority parameter according to a ratio of the reactive contribution and the active contribution includes:

6. The method for controlling a voltage of a transformer area according to claim 1, wherein before determining the priority parameter according to the reactive contribution and the active contribution of the converter device to the ac load, the method further comprises:

and/or

7. The method of claim 6, wherein the determining the reactive contribution from the first regulated ac voltage and the regulated reactive parameter comprises:

and/or

If the second regulated alternating voltage or the regulated active parameter meets a second preset rule, determining a change value of the active parameter according to the regulated active parameter and the initial active parameter, and determining a change value of a second alternating voltage according to the second regulated alternating voltage and the initial alternating voltage;

and calculating the active contribution according to the change value of the active parameter and the change value of the second alternating voltage.

8. The method of claim 6, further comprising:

9. A bay voltage control apparatus, the apparatus comprising:

The power module is used for determining power parameters according to the alternating voltage, the preset target voltage and the line impedance;

10. A distributed energy storage device, the distributed energy storage device comprising:

the system comprises a controller, a converter device and an energy storage device; the controller is respectively in communication connection with the variable-current device and the energy storage device;

the energy storage device is electrically connected to an input end of an ac load of a preset zone through the current transformation device, and the controller is configured to execute the zone voltage control method according to any one of claims 1 to 8.