CN116316903A

CN116316903A - Active power adjusting method and system and wind farm

Info

Publication number: CN116316903A
Application number: CN202111575258.0A
Authority: CN
Inventors: 左美灵
Original assignee: Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Current assignee: Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2023-06-23

Abstract

An active power adjusting method, an active power adjusting system and a wind farm relate to the technical field of wind power generation. When the method is applied to a reactive power management platform VMP of a wind power plant, when automatic power generation control and primary frequency modulation are simultaneously carried out, determining a current remaining scheduling plan value according to the active power of a current grid-connected point and a scheduling plan value of automatic power generation control sent by an energy management platform EMP; and the time from the EMP to the next control period of the automatic power generation control is divided evenly according to the first sub-periods, and the average scheduling plan value in each first sub-period is determined according to the number of the first sub-periods and the remaining scheduling plan value. And issuing a first comprehensive scheduling instruction to each wind generating set of the wind power plant in each first sub-period, wherein the first comprehensive scheduling instruction indicates the sum of an average scheduling plan value and a primary frequency modulation scheduling plan value in each first sub-period. The method can enable the AGC command to be issued step by step in a single scheduling control period, and realize coordination control between AGC and primary frequency modulation.

Description

Active power adjusting method and system and wind farm

Technical Field

The application relates to the technical field of wind power generation, in particular to an active power adjusting method and system and a wind power plant.

Background

At present, the scale of the wind power grid-connected installation is increased rapidly, and the future wind power grid-connected scale is still increased continuously. With the development of the extra-high voltage power grid and the large-scale continuous grid connection of new energy, the extra-high voltage alternating current and direct current hybrid power grid is gradually formed, the power grid pattern and the power supply structure are greatly changed, the power grid characteristics are also deeply changed, and the working condition of large-scale wind power grid connection operation is more complicated. With the improvement of the permeability of wind power generation to the power grid, the original thermal power and hydropower have insufficient frequency regulation capability to the power grid, and new energy is needed to participate in frequency control.

Primary frequency modulation (Primary Frequency Control, PFR) refers to an automatic control process in which when the frequency of a power system (e.g., a power grid) deviates from a target frequency, the active power is adjusted to limit the grid frequency variation by controlling the system's automatic reaction, so that the grid frequency remains stable. The automatic power generation control (Automatic Generation Control, AGC) means that the wind power plant is enabled to track the instruction issued by the power dispatching transaction mechanism within the specified output adjustment range through an automatic control program, and the power generation output is adjusted in real time according to a certain adjustment rate so as to meet the service of the frequency and power control requirements of the power system.

At present, an AGC command of a wind power generation system is distributed and issued in one step in one control period, so that the power adjustment quantity indicated by the AGC command is larger, and impact on a power grid is larger, so that the AGC command is expected to be issued step by step in a single control period at present, but when the wind power generation system is subjected to primary frequency modulation at the same time, the coordination control between the AGC and the primary frequency modulation cannot be realized.

Disclosure of Invention

In order to solve the technical problems in the prior art, the application provides an active power adjusting method, an active power adjusting system and a wind farm, which can enable an AGC instruction to be issued step by step in a single scheduling control period, and realize coordination control between AGC and primary frequency modulation.

In a first aspect, the present application provides a method for regulating active power, applied to a reactive power management platform (VMP) of a wind farm, also called Voltage/reactive power management platform, the method comprising:

when primary frequency modulation is carried out, an energy management platform (Energy Management Platform, EMP) is in a first automatic power generation control state, and the EMP does not carry out automatic power generation control, a primary frequency modulation control instruction is issued to each wind generating set, the primary frequency modulation control instruction is used for indicating a scheduling value of active power corresponding to the primary frequency modulation, and the first automatic power generation control state is that the EMP carries out automatic power generation control according to the scheduling value of the active power sent by a power grid side;

When the EMP is in a first automatic power generation control state and simultaneously performs automatic power generation control and primary frequency modulation, determining a current residual scheduling plan value according to the active power of the current grid-connected point and the scheduling plan value of the automatic power generation control acquired from the EMP; dividing the time of a control period of the next automatic power generation control acquired from the EMP according to the average of first sub-periods, and determining an average scheduling plan value in each first sub-period according to the number of the first sub-periods and the residual scheduling plan value; and issuing a first comprehensive scheduling instruction to each wind generating set of the wind power plant in each first sub-period, wherein the first comprehensive scheduling instruction is used for indicating the sum of an average scheduling plan value distributed by the wind generating set in each first sub-period and the scheduling plan value of primary frequency modulation in each first sub-period.

In summary, when the primary frequency modulation is performed, the VMP of the wind power station is utilized to control the active power output by each wind generating set, so that the quick response to the primary frequency modulation is realized. When primary frequency modulation and AGC are performed simultaneously, the VMP of the wind power station controls the active power output by each wind generating set, and the VMP gradually issues a first comprehensive scheduling instruction according to a first sub-period, and the first comprehensive scheduling instruction simultaneously indicates the response to the primary frequency modulation and the response to the AGC. Therefore, the scheme can enable the AGC command to be issued step by step in a single scheduling control period, and realize coordination control between AGC and primary frequency modulation.

In one possible implementation, the method further includes:

when the power grid frequency is determined to be in a preset normal frequency range, determining that the primary frequency modulation is finished;

and in the preset number of first sub-periods, issuing a recovery scheduling instruction to each wind generating set of the wind power plant, wherein the recovery scheduling instruction is used for indicating an average scheduling plan value distributed by the wind generating set in each first sub-period.

In one possible implementation, the method further includes:

when the active power output by the wind power plant is smaller than a first preset value, controlling the wind power plant not to perform primary frequency modulation, and controlling the wind power generator set with the output active power smaller than a second preset value not to perform primary frequency modulation.

In one possible implementation, the method further includes:

and when the first comprehensive scheduling instruction determines that the wind generating set needs to be shut down, sending a shutdown instruction to the EMP, wherein the machine instruction is used for instructing the EMP to control the corresponding wind generating set to be shut down.

In one possible implementation, the method further includes:

when primary frequency modulation is carried out, the EMP is in a second automatic power generation control state and automatic power generation control is not carried out, the primary frequency modulation control instruction is issued to each wind generating set, and the second automatic power generation control state is that the EMP carries out automatic power generation control according to a locally input scheduling value of active power;

When the EMP is in a second automatic power generation control state and performs automatic power generation control and primary frequency modulation simultaneously, a second comprehensive scheduling instruction is issued to each wind generating set according to the current active power of the grid-connected point and the scheduling plan value of the automatic power generation control acquired from the EMP, and the second comprehensive scheduling instruction is used for indicating the sum of the scheduling plan value of the automatic power generation control distributed by the wind generating set and the scheduling plan value of the primary frequency modulation. In one possible implementation, the method further includes:

obtaining an output upper limit value of active power of the wind power plant from the EMP;

when primary frequency modulation is performed and automatic power generation control is not performed, or when automatic power generation control and primary frequency modulation are simultaneously performed, clipping is performed using the output upper limit value of the active power.

In a second aspect, the present application also provides a method for regulating active power, applied to an energy management platform (Energy Management Platform, EMP) of a wind farm, the method comprising:

when automatic power generation control is performed, the automatic power generation control is in a first automatic power generation control state and primary frequency modulation is not performed, the control period of the automatic power generation control is divided evenly according to second sub-periods, an automatic power generation control instruction is issued to each wind generating set in each second sub-period, the automatic power generation control instruction is used for indicating a dispatching value of active power corresponding to the automatic power generation control distributed by the wind generating set, and the first automatic power generation control state is that the EMP performs automatic power generation control according to the dispatching value of the active power sent by the power grid side.

When in the first automatic power generation control state and the automatic power generation control and the primary frequency modulation are simultaneously performed, determining the time from the next control period and the scheduling plan value of the automatic power generation control.

In summary, when the scheme of the application is used for performing AGC only, the EMP of the wind power station is utilized to control the active power output by each wind generating set, so that the AGC command is issued gradually in a single control period, the impact on a power grid is reduced, the reliability and stability of the wind power station are improved, and the scheme can be applied to scenes that the power grid is unstable or the wind power generation has higher permeability to the power grid. When primary frequency modulation and AGC are carried out simultaneously, the VMP acquires information required by AGC from an EMP side, and the VMP controls active power output by each wind generating set.

The VMP gradually issues a first integrated scheduling instruction in accordance with a first sub-period, the first integrated scheduling instruction indicating both a response to primary frequency modulation and a response to AGC. Therefore, the scheme can enable the AGC command to be issued step by step in a single scheduling control period, and realize coordination control between AGC and primary frequency modulation.

In one possible implementation manner, the issuing an automatic power generation control command to each wind generating set in each second sub-period specifically includes:

In each second sub-period, determining a scheduling value of the active power corresponding to each wind generating set in each second sub-period according to the target value of automatic power generation control and the current active power of the grid-connected point;

and determining an automatic power generation control instruction corresponding to each wind generating set in each second sub-period according to the scheduling value of the active power corresponding to each wind generating set in each second sub-period.

In one possible implementation, the method further includes:

receiving a shutdown instruction sent by the VMP;

and determining the wind generating set which needs to be stopped at present according to the stopping instruction, and controlling the corresponding wind generating set to stop.

In one possible implementation, the method further includes:

when the automatic power generation control is performed, the wind turbine generator is in the second automatic power generation control state and the primary frequency modulation is not performed, a local automatic power generation control command is issued to each wind turbine generator set in a control period of the automatic power generation control. The local automatic power generation control instruction is used for indicating a scheduling value of corresponding active power distributed by the wind generating set when the local automatic power generation control is performed. And the second automatic power generation control state is that the EMP performs automatic power generation control according to the dispatching value of the local input active power.

And determining a scheduling plan value of the automatic power generation control when the automatic power generation control is in the second automatic power generation control state and the automatic power generation control and the primary frequency modulation are performed simultaneously.

In one possible implementation, the method further includes:

and obtaining the output upper limit value of the active power of the wind power plant and storing the output upper limit value in a local place.

In a third aspect, the present application further provides an active power conditioning device, where the device is a VMP of a wind farm, and the device includes a first memory, a first controller, a first interface, and a plurality of second interfaces. The first interface is used for being connected with an EMP of a wind power plant, each second interface in the plurality of second interfaces is used for being connected with a wind power generator set, an executable program is stored in the first memory, and the executable program is used for realizing the active power adjusting method in the implementation mode when being executed by the first controller.

In a fourth aspect, the present application further provides an active power conditioning apparatus, the apparatus being an EMP of a wind farm, the apparatus comprising: the system comprises a second memory, a second controller, a third interface and a plurality of fourth interfaces. The third interface is used for being connected with a reactive power management platform VMP of the wind power plant, each interface in the plurality of interfaces is used for being connected with a wind power generator set, an executable program is stored in the second memory, and when the executable program is executed by the second controller, the active power adjusting method in the implementation mode is achieved.

In a fifth aspect, the present application also provides a wind farm comprising the EMP and VMP provided by the above implementations. Wherein, the EMP and the VMP are connected with each other.

In one possible implementation, the EMP and the VMP are coupled by an optical fiber.

By utilizing the wind power plant provided by the application, the AGC command can be issued gradually in a single dispatching control period, the coordination control between AGC and primary frequency modulation is realized, the impact on a power grid can be reduced when AGC is performed, and the wind power plant can be applied to a scene that the power grid is unstable or the wind power generation has higher permeability to the power grid.

Drawings

FIG. 1 is a schematic diagram of a wind farm;

fig. 2 is a schematic diagram of a method for adjusting active power according to an embodiment of the present application;

FIG. 3 is a waveform diagram of a primary frequency modulation droop control according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of another active power adjustment method according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of another method for adjusting active power according to an embodiment of the present disclosure;

FIG. 6 is a flowchart of another method for adjusting active power according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of an active power adjusting device according to an embodiment of the present application;

FIG. 8 is a schematic diagram of another active power conditioning apparatus according to an embodiment of the present application;

fig. 9 is a schematic diagram of a wind farm according to an embodiment of the present application.

Detailed Description

In order to make the person skilled in the art more clearly understand the application scheme, the application scenario of the application scheme is first described below.

With the development of the extra-high voltage power grid and the large-scale continuous grid connection of new energy, the extra-high voltage alternating current and direct current hybrid power grid is gradually formed, the power grid pattern and the power supply structure are greatly changed, the power grid characteristics are also deeply changed, and the working condition of large-scale wind power grid connection operation is more complicated. With the improvement of the permeability of wind power generation to the power grid, the original thermal power and hydropower have insufficient frequency regulation capability to the power grid, and new energy is needed to participate in frequency control. The technical scheme provided by the application can be applied to a new energy grid-connected scene, and wind power generation grid-connected is taken as an example for explanation.

Referring to fig. 1, a schematic diagram of a wind farm is shown.

The power plant 10 shown in fig. 1 includes a plurality of wind power generation sets 11, a reactive management platform (VMP) 12, and an energy management platform (Energy Management Platform, EMP) 13.

The wind power generation units 11 are connected with the VMP12 and the EMP13 through a fan communication network, and the fan communication network can support Modbus communication protocol, profinrt automation bus standard and Ethernet control automation technology (Ether Control Automation Technology, etherCAT).

VMP12 of wind power plant is used for carrying out primary frequency modulation (Primary Frequency Control, PFR), and the active power of the grid-connected point is controlled by automatically detecting the frequency of the grid-connected point so as to meet the condition that the frequency of the grid-connected point is in a preset normal range. The primary frequency modulation control device VMP12 is used for controlling within the lower active power control limit and rated power section of the wind generating set, and cannot start the wind generating set when the power is insufficient or stop the wind generating set when the power is limited.

The EMP13 of the wind power plant is automatic power generation control (Automatic Generation Control, AGC) equipment, which is used for enabling the wind power plant to track an instruction issued by a power dispatching transaction mechanism within a specified output adjustment range through an automatic control program, and adjusting the power generation output in real time according to a certain adjustment rate so as to meet the service required by the frequency and power control of the power system. The AGC control command is distributed and issued in one step in each control period, and in practical application, the control period is relatively long, for example, can reach 5 minutes, which makes the power adjustment amount indicated by the AGC command larger and causes larger impact on the power grid, so it is expected that the AGC command can be issued gradually in a single control period.

However, when the wind power generation system also carries out primary frequency modulation, the two types of adjustment simultaneously need to adjust the power output by the wind power generator set, but only one of the VMP12 or the EMP13 can control the wind power generator set at the same time, so that the coordination control between AGC and primary frequency modulation cannot be realized at present.

In order to solve the problems, the embodiment of the application provides an active power adjusting method, an active power adjusting system and a wind farm, which can enable an AGC instruction to be issued gradually in a single scheduling control period, and realize coordination control between AGC and primary frequency modulation.

In order to make the technical solution more clearly understood by those skilled in the art, the following description will refer to the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application.

The words "first," "second," and the like in the description herein are used for descriptive purposes only and are not to be interpreted as indicating or implying a relative importance or implicitly indicating the number of features indicated

In the present application, unless explicitly specified and limited otherwise, the term "coupled" is to be construed broadly, and for example, "coupled" may be either fixedly coupled, detachably coupled, or integrally formed; may be directly connected or indirectly connected through an intermediate medium.

The embodiment of the application provides a method for adjusting active power, and the method is specifically described below with reference to the accompanying drawings.

Referring to fig. 2, the diagram is a schematic diagram of a method for adjusting active power according to an embodiment of the present application.

When the method shown in fig. 2 is applied to a wind farm, which performs primary frequency modulation only and does not perform AGC, the method is specifically implemented by VMP of the wind farm, and when the wind farm does not perform AGC, EMP equipment of the wind farm can be in a first automatic power generation control state or a first automatic power generation control state.

The first automatic power generation control state is that EMP performs automatic power generation control according to a scheduling value of active power sent by a power grid side. And the second automatic power generation control state is that the EMP performs automatic power generation control according to the locally input scheduling value of the active power.

The method comprises the following steps:

s201: when the frequency of the power grid is determined to deviate from the preset frequency range, the primary frequency modulation is determined to be needed at the moment.

S202: and when the primary frequency modulation is determined and the automatic power generation control is not performed, issuing a primary frequency modulation control command to each wind generating set.

The primary frequency modulation control instruction is used for indicating a scheduling value of active power corresponding to primary frequency modulation distributed by the wind generating set.

Under the condition that the wind power plant has disturbance, the total scheduling amount of the primary frequency modulation is not adjusted downwards after reaching a first preset proportion of rated output of the wind power plant, and is not adjusted upwards after reaching a second preset proportion of rated output of the wind power plant. The first preset proportion and the second preset proportion are not particularly limited, for example, the first preset proportion may be 10%, and the second preset proportion may be 5%.

The droop characteristic of primary frequency modulation is realized by setting a broken line function of frequency and active power, and the broken line function is as follows:

p in the formula (1) is the active power which is expected to be output currently, P ₀ As the actual initial value of the active power, delta% is the primary frequency modulation difference adjustment coefficient, P _N For rated power, f is the actual frequency of the current power grid, f _d For primary frequency modulation dead zone frequency f _N Is the rated frequency of the power generation system.

Referring to fig. 3, a waveform diagram of primary frequency modulation droop control according to an embodiment of the present application is shown.

At this time, the primary frequency modulation dead zone frequency is set to 0.05Hz, the difference adjustment coefficient is set to 5%, and the primary frequency modulation power is adjusted to be 6%P by maximum power limiting _N Regulating maximum power limiting limit to 10% P under primary frequency modulation power _N The sagging curve of the wind power station participating in primary frequency modulation of the power grid is shown in fig. 3.

When primary frequency modulation is only carried out, VMP determines the total scheduling value of active power corresponding to the primary frequency modulation by using formula (1) according to the primary frequency modulation difference coefficient of the wind power plant, the rated power of the wind power plant, the current power grid frequency, the primary frequency modulation dead zone frequency and the rated frequency.

And then the VMP acquires the current running state of each wind generating set, determines the scheduling value of the active power corresponding to the primary frequency modulation allocated to each wind generating set, and issues a primary frequency modulation control instruction to each wind generating set, wherein the primary frequency modulation control instruction is used for indicating the scheduling value of the active power corresponding to the primary frequency modulation.

In response to the primary frequency modulation control command, the speed of the wind generating set for adjusting the active power output by the wind generating set after responding to the primary frequency modulation control command can reach 100kW/s.

To sum up, according to the scheme of the application, when the EMP equipment is in the first automatic power generation control state and does not perform automatic power generation control, or when the EMP equipment is in the second automatic power generation control state and does not perform automatic power generation control, the VMP of the wind power station is utilized to control the active power output by each wind power generator set during primary frequency modulation, and therefore the quick response to the primary frequency modulation is realized.

The implementation of the wind power station when only AGC is performed is described below.

When the EMP device performs the automatic power generation control, the device may be in the first automatic power generation control state or the first automatic power generation control state. The implementation of the EMP device when in the first automatic power generation control state will be described first.

Referring to fig. 4, a schematic diagram of another active power adjustment method according to an embodiment of the present application is shown.

The method shown in fig. 4 is specifically implemented by the EMP of the wind farm when the wind farm performs AGC only and does not perform primary frequency modulation, and includes the following steps:

s301: when the automatic power generation control is performed, the automatic power generation control is in the first automatic power generation control state, and the primary frequency modulation is not performed, the control period of the automatic power generation control is divided equally according to the second sub-period.

The first automatic power generation control state is that the EMP performs automatic power generation control according to the dispatching value of the active power sent by the power grid side, namely, performs automatic power generation control according to the dispatching value of the non-local active power.

In the embodiment of the present application, specific values of the control period and the second sub-period of the AGC are not limited, for example, in one possible implementation, the control period of the AGC is 5 minutes, the second sub-period is 10 seconds, the control period is divided into 30 second sub-periods,

S302: and issuing an automatic power generation control instruction to each wind generating set in each second sub-period, wherein the automatic power generation control instruction is used for indicating a scheduling value of active power corresponding to the automatic power generation control allocated to each wind generating set.

Because the control period corresponding to the AGC is longer, in order to reduce direct impact on a power grid, the method for gradually issuing the AGC scheduling value is adopted. I.e. the control period is divided into a number of second sub-periods and the AGC schedule value is issued step by step, as will be explained in more detail below.

Firstly, in each second sub-period, EMP is according to the deviation value between the target value of automatic power generation control and the current active power of the grid-connected point, and the deviation value is the sum of the scheduling values of the active power corresponding to all wind generating sets in the second sub-period.

And then, determining the scheduling value of the active power corresponding to each wind generating set in each second sub-period.

Taking the second sub-period as 10 seconds as an example, that is, performing closed loop control once every 10 seconds of EMP, so that the active power change of AGC is equally divided within 5 minutes, and the final grid-connected point reaches the scheduling target value.

In summary, when the scheme of the application is used for performing AGC only, the EMP of the wind power station is utilized to control the active power output by each wind generating set, so that the AGC command is issued gradually in a single control period, the impact on a power grid is reduced, the reliability and stability of the wind power station are improved, and the scheme can be applied to scenes that the power grid is unstable or the wind power generation has higher permeability to the power grid.

The implementation of the EMP device when in the second automatic power generation control state is described below.

When the EMP equipment is in the second automatic power generation control state, namely, the EMP performs automatic power generation control according to the locally input scheduling value of the active power, and the scheduling value of the active power is locally input by the power station.

The EMP determines the scheduling value of the active power which is supposed to be distributed for each wind generating set according to the active power which is currently output by each wind generating set and the scheduling value of the active power.

And the EMP issues local automatic power generation control instructions to each wind generating set in the control period of automatic power generation control. And the local automatic power generation control instruction is used for indicating the corresponding scheduling value of the active power distributed by the wind generating set when the local automatic power generation control is performed, namely the EMP can realize the local automatic power generation control by adopting an implementation mode of one-time issuing of the scheduling value of the active power.

In the above description, since the AGC device for active power control and the control device for primary frequency modulation are operated in parallel, both devices need to implement power adjustment by controlling the wind turbine, but one wind turbine can only be controlled by one device at a time, so that under different working conditions, the control right of the wind turbine needs to be switched between the two devices, that is, between the EMP and the VMP.

The implementation of the wind power station when AGC and primary frequency modulation are performed simultaneously is described below.

Firstly, the implementation mode of the wind power station for simultaneously performing AGC and primary frequency modulation when the EMP is in the first automatic power generation control state is described.

Referring to fig. 5, a schematic diagram of another active power adjustment method according to an embodiment of the present application is shown.

When the method shown in fig. 5 is applied to a wind farm and performs primary frequency modulation and AGC, the following description will take an example of performing primary frequency modulation in one control period of AGC, and the method includes the following steps:

s401: when the EMP is in the first automatic power generation control state and simultaneously performs automatic power generation control and primary frequency modulation, the time from the next control period and the scheduling plan value of the automatic power generation control are determined. In practice, the VMP may read the automatic power generation control state identifier of the EMP to determine whether the EMP is in the first automatic power generation control state or the second automatic power generation control state.

When the AGC and the primary frequency modulation are carried out simultaneously, the VMP catcher controls each wind generating set, and the EMP does not control each wind generating set any more, so that the VMP needs to be informed of the execution condition of the AGC.

The AGC performance, i.e., the time from the next control period, and the schedule value of the automatic power generation control.

Wherein the time from the next control period, i.e. the remaining time of the current control period.

The scheduling plan value of the automatic power generation control, namely, the active power value output by the grid connection point of the wind power plant is expected by performing AGC.

It will be appreciated that in practical applications, after the current AGC control period is completed and the next AGC control period is performed, the EMP obtains a new scheduling plan value but the primary frequency modulation is not yet completed. At this time, the EMP may continue to send information to the VMP to update the time from the next control period and the schedule value, and the VMP may still control each wind turbine generator.

S402: when the VMP performs automatic power generation control and primary frequency modulation simultaneously, determining the current remaining scheduling plan value according to the active power of the current grid-connected point and the scheduling plan value of the EMP transmitting automatic power generation control.

Before starting control of the catcher, VMP measures the active power output by the current grid-connected point as P ₁ 。

The scheduling plan value of the EMP transmission acquired by the VMP is P ₂ 。

The current remaining schedule value Δp is determined by:

ΔP＝P ₂ -P ₁ (2)

Δp is the difference in grid-tie point distance schedule plan value. After the control is started, the comparison active power difference value is not measured any more, and open loop control is performed.

S403: and the time from the EMP to the next control period of the automatic power generation control is divided evenly according to the first sub-periods, and the average scheduling plan value in each first sub-period is determined according to the number of the first sub-periods and the remaining scheduling plan value.

The first sub-period may be set according to practical situations, and the embodiment of the present application is not specifically limited. In view of practical application, in order to quickly respond to primary frequency modulation, the first sub-period is generally smaller than the second sub-period when AGC is performed, for example, the first sub-period may be set to 1 second.

The VMP equally divides the time from the control period of the next automatic power generation control in accordance with the first sub-period. Taking the first sub-period of 1 second as an example, the time from the control period of the next automatic power generation control is 2 minutes. Then the VMP determines that there are 120 first sub-periods.

Then within 2 minutes, the average scheduling plan value P in each first sub-period _ave Can be determined by the following formula:

P _ave ＝ΔP/120 (3)

s404: and issuing a first comprehensive scheduling instruction to each wind generating set of the wind power plant in each first sub-period, wherein the first comprehensive scheduling instruction indicates the sum of an average scheduling plan value distributed by the wind generating set in each first sub-period and a scheduling plan value of primary frequency modulation in each first sub-period.

VMP determines the scheduling plan value ΔP for primary frequency modulation in each first sub-period _f 。

VMP issues first comprehensive dispatching instruction to each wind generating set of wind power plant, and the comprehensive dispatching value P indicated by the first comprehensive dispatching instruction ₃ Satisfies the following formula:

P ₃ ＝P ₀ +ΔP _f +P _ave (4)

i.e. P ₃ And the sum of the active power output by the wind generating set in the last first sub-period, the average scheduling plan value in the current first sub-period and the scheduling plan value of primary frequency modulation in the current first sub-period is used. The scheduling plan value of the primary frequency modulation calculated in each first sub-period is directly issued.

Δp above _f And P _ave May be greater than zero or less than zero.

It will be appreciated that when the current first sub-period is the first sub-period, P ₀ Zero.

In addition, because the running states of the wind power generation sets in the wind power plant are different, the sizes of the scheduling values indicated in the first comprehensive scheduling instructions corresponding to the wind power generation sets are generally different in each first period.

The above steps in the embodiments of the present application are merely for convenience of description, and are not limited to the technical solution of the present application, and a person skilled in the art may appropriately adjust the above steps during actual application, so that the obtained implementation manner is also within the protection scope of the present application.

In summary, by using the method provided by the embodiment of the present application, when primary frequency modulation and AGC are performed simultaneously, the VMP of the wind power station controls active power output by each wind power generator set, and the VMP gradually issues a first comprehensive scheduling instruction according to a first sub-period, where the first comprehensive scheduling instruction indicates a response to the primary frequency modulation and a response to the AGC at the same time. Therefore, the scheme can enable the AGC command to be issued step by step in a single scheduling control period, and realize coordination control between AGC and primary frequency modulation. The impact on the power grid can be reduced when AGC is performed, and the method can be applied to the scenes that the power grid is unstable or the permeability of wind power generation on the power grid is high.

Further, the method may further comprise the steps of:

s405: and when the VMP determines that the power grid frequency is in the preset normal frequency range, determining that primary frequency modulation is finished.

That is, after the frequency of the power grid is recovered to be normal, the VMP determines that the primary frequency modulation is finished, and prepares to give control right to the wind generating set back to the EMP equipment.

This normal frequency range is also referred to as the dead band frequency of the power grid in practice.

S406: and in the preset number of the first sub-periods, issuing a recovery scheduling instruction to each wind generating set of the wind power plant, wherein the recovery scheduling instruction is used for indicating an average scheduling plan value distributed by the wind generating set in each first sub-period.

When the power grid frequency returns to a preset number of first sub-periods within a preset normal frequency range, the VMP needs to send a scheduling restoration instruction to the fan. In the embodiment of the present application, the preset number is not specifically limited, and in practical application, the preset number may take a smaller value such as 1, 2 or 3.

The comprehensive scheduling value P indicated by the recovery scheduling instruction ₄ Satisfies the following formula:

P ₄ ＝P ₀ +P _ave (5)

i.e., corresponds to ΔP in formula (4) _f Zero.

The VMP continues to control the preset number of first sub-periods of each wind generating set, so as to prevent big fluctuation caused by that the frequency modulation recovery power of the fan is not executed in place and changed measured values are acquired when the EMP starts to control.

When the control right is switched back to the EMP, the EMP continues to control in a manner shown in fig. 4, that is, the remaining control periods are divided equally according to the second sub-periods, and an automatic power generation control command is issued to each wind generating set in each second sub-period, which is not described herein.

In practical application, when the VMP performs primary frequency modulation, and when the active power output by the wind farm is smaller than a first preset value, the wind farm is controlled not to perform primary frequency modulation, and the first preset value is not specifically limited in the embodiment of the present application, and may be set to 10% of rated power of the wind farm, for example. Similarly, when the active power output by a single wind turbine generator set is smaller than a second preset value, the wind turbine generator set is controlled not to perform primary frequency modulation, and the second preset value is not particularly limited in the embodiment of the present application, and may be set to 10% of the rated power of the single wind turbine generator set, for example.

In addition, when VMP performs primary frequency modulation, or VMP performs automatic power generation control and primary frequency modulation simultaneously, when active power up-regulation is performed, the active power output by the wind farm cannot exceed the output upper limit value of the active power of the wind farm. The output upper limit value of the active power of the wind power plant can be issued from the central control side, and the EMP acquires the output upper limit value and stores the output upper limit value locally.

The VMP obtains an output upper limit value of active power of the wind farm from the EMP by communicating with the EMP.

Then, when primary frequency modulation is performed and automatic power generation control is not performed, or when automatic power generation control and primary frequency modulation are simultaneously performed, VMP uses the output upper limit value of the active power to perform amplitude limitation. Namely, the control instruction calculated from the primary frequency modulation and AGC coordinated control mode is finally executed after the amplitude limiting calculation of the output upper limit value of the active power.

The implementation mode of the wind power station in the process of simultaneously performing AGC and primary frequency modulation when the EMP is in the second automatic power generation control state is described below.

And when the EMP is in the second automatic power generation control state and simultaneously performs automatic power generation control and primary frequency modulation, determining a scheduling plan value of the automatic power generation control.

When the EMP is in a second automatic power generation control state and simultaneously performs automatic power generation control and primary frequency modulation, the VMP issues a second comprehensive scheduling instruction to each wind generating set according to the active power of the current grid-connected point and the scheduling plan value of the automatic power generation control acquired by the EMP.

In practical applications, the VMP may read the automatic power generation control state identifier of the EMP to determine whether the EMP is in the second automatic power generation control state.

The second comprehensive dispatching instruction is used for indicating the sum of the dispatching planning value of the automatic power generation control distributed by the wind generating set and the dispatching planning value of primary frequency modulation.

At this point, in one possible implementation, the VMP superimposes the primary tuned scheduling plan value and the remaining auto-power-generation controlled scheduling plan values to determine the overall scheduling plan value. And then determining a scheduling value of the active power distributed by each wind generating set according to the active power currently output by each wind generating set, and then issuing the scheduling value to the fan in place in one step, so that the period dividing operation in the description is not performed.

In practical application, the EMP can control the wind generating set to start and stop, and perform active control in a large range, and the VMP can only perform control over the lower limit value of the output power, and can not realize stop and the like. In order to cope with the situation that a wind power plant needs to be shut down when AGC is performed simultaneously in the frequency modulation process, the application also provides a method for controlling the shutdown of a wind power generator set, and the method is specifically described below.

Referring to fig. 6, a flowchart of another active power adjustment method according to an embodiment of the present application is shown.

The method shown in fig. 6 is used for realizing shutdown control of the wind generating set, and comprises the following steps:

s501: and when the VMP determines that the wind generating set needs to be shut down according to the first comprehensive scheduling instruction, sending a shutdown instruction to the EMP, wherein the machine instruction is used for instructing the EMP to control the corresponding wind generating set to be shut down.

S502: and the EMP receives a stop instruction sent by the VMP.

S503: and the EMP determines the wind generating set which needs to be stopped at present according to the stopping instruction and controls the corresponding wind generating set to stop.

In one possible implementation, the EMP actively returns control to the VMP after completing shutdown control of the wind turbine.

In another possible implementation, the EMP continues to operate normally after the shutdown control of the wind turbine is completed, and when the EMP determines that primary frequency modulation is currently required, or both primary frequency modulation and AGC are performed, the control right is handed over to the VMP in the manner provided in the above embodiment.

In summary, by using the scheme of the present application, when the EMP performs automatic power generation control according to the scheduling value of the active power sent by the power grid side, the AGC instruction can be issued step by step in a single scheduling control period, and coordination control between AGC and primary frequency modulation is achieved. In addition, the active power of the output of the wind power station can be ensured not to exceed the output upper limit value of the active power in the dispatching process, VMP and EMP can be flexibly switched and can normally and independently operate, and the primary frequency modulation and the coordination control with AGC under the full working condition of the wind power station are realized.

Based on the active power adjusting method provided by the embodiment, the embodiment of the application also provides active power adjusting equipment, and the active power adjusting equipment is specifically described below with reference to the accompanying drawings.

Referring to fig. 7, a schematic diagram of an active power adjustment device according to an embodiment of the present application is shown.

The active power regulating device 70 shown in fig. 7 is a VMP of a wind power plant, the device comprising: a first memory 71, a first controller 72, a first interface 73, and a plurality of second interfaces 74.

Wherein the first interface 73 is for connecting to an EMP of a wind farm. Each second interface 74 of the plurality of second interfaces 74 is for connecting one wind power generation set 11.

The first memory has an executable program stored thereon.

The executable program, when executed by the first controller 72, implements the active power adjustment method applied to the VMP provided in the above embodiment.

For the method for adjusting the active power applied to the VMP, reference may be made to the related description in the above embodiments, which are not described herein.

In summary, by using the device provided by the embodiment of the application, when the wind farm only carries out primary frequency modulation, active power output by each wind generating set can be controlled, and then quick response to the primary frequency modulation is realized. When the EMP is in a first automatic power generation control state and primary frequency modulation and AGC are performed at the same time, active power output by each wind generating set can be controlled, and a first comprehensive scheduling instruction is gradually issued according to a first sub-period, and the first comprehensive scheduling instruction simultaneously indicates the response to the primary frequency modulation and the response to the AGC. The device can enable the AGC command to be issued step by step in a single scheduling control period, and realize coordination control between AGC and primary frequency modulation.

Another active power adjusting device provided in the embodiments of the present application is described below.

Referring to fig. 8, a schematic diagram of another active power adjustment device according to an embodiment of the present application is shown.

The active power regulating device 70 shown in fig. 8 is an EMP of a wind power plant, the device comprising: a second memory 81, a second controller 82, a third interface 83, and a plurality of fourth interfaces 84.

Wherein the third interface 83 is for connecting to a VMP of a wind farm. Each of the plurality of fourth interfaces 84 is used to connect to a wind turbine generator set, and the second memory 81 stores an executable program.

The executable program, when executed by the second controller 82, implements the active power adjustment method applied to the EMP provided in the above embodiment.

For the method for adjusting the active power applied to the EMP, reference may be made to the related description in the above embodiments, which are not described herein.

In summary, the device provided by the embodiment of the application is in the first automatic power generation control state, and when the wind power station only performs AGC, the AGC command can be issued step by step in a single control period, so that the impact on a power grid is reduced, the reliability and stability of the wind power station are improved, and the device can be applied to scenes where the power grid is unstable or the wind power generation has higher permeability to the power grid. When the device is in a first automatic power generation control state and performs primary frequency modulation and AGC simultaneously, the device sends information required by AGC to the VMP, and the VMP controls active power output by each wind generating set. The VMP gradually issues a first integrated scheduling instruction in accordance with a first sub-period, the first integrated scheduling instruction indicating both a response to primary frequency modulation and a response to AGC.

The first controller 72 and the second controller 82 in the above embodiments of the present application may be application specific integrated circuits (Application Specific Integrated Circuit, ASIC), programmable logic devices (Programmable Logic Device, PLD), digital signal processors (Digital Signal Processor, DSP), or a combination thereof. The PLD may be a complex programmable logic device (Complex Programmable Logic Device, CPLD), a Field programmable gate array (Field-programmable Gate Array, FPGA), a general-purpose array logic (Generic Array Logic, GAL), or any combination thereof, and embodiments of the present application are not particularly limited.

Based on the active power adjusting device provided by the embodiment, the embodiment of the application also provides a wind farm, and the wind farm is specifically described below with reference to the accompanying drawings.

Referring to fig. 9, a schematic diagram of a wind farm is provided in an embodiment of the present application.

The wind farm 90 shown in fig. 9 includes the work

power regulating devices

70 and 80 provided by the above embodiments, and also includes a plurality of wind power generating sets 11.

The wind power generation unit 11 is for generating electric power from wind energy.

For a description of the

power adjusting devices

70 and 80, reference may be made to the above embodiments, and the embodiments of the present application will not be repeated here.

By utilizing the wind power plant provided by the embodiment of the application, when EMP performs automatic power generation control according to the scheduling value of active power sent by the power grid side, an AGC command can be issued gradually in a single scheduling control period, coordination control between AGC and primary frequency modulation is realized, impact on the power grid can be reduced when AGC is performed, and the wind power plant can be applied to scenes where the power grid is unstable or the wind power generation has higher permeability to the power grid.

It should be understood that in this application, "at least one" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. The apparatus embodiments described above are merely illustrative, wherein the units and modules illustrated as separate components may or may not be physically separate. In addition, some or all of the units and modules can be selected according to actual needs to achieve the purpose of the embodiment scheme. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

The foregoing is merely exemplary of the application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the application and are intended to be comprehended within the scope of the application.

Claims

1. A method for regulating active power, characterized by being applied to a reactive management platform VMP of a wind farm, the method comprising:

when primary frequency modulation is carried out, an energy management platform EMP is in a first automatic power generation control state and automatic power generation control is not carried out, a primary frequency modulation control instruction is issued to each wind generating set, the primary frequency modulation control instruction is used for indicating a scheduling value of active power corresponding to the primary frequency modulation distributed by each wind generating set, and the first automatic power generation control state is that the EMP carries out automatic power generation control according to the scheduling value of the active power sent by a power grid side;

When the EMP is in a first automatic power generation control state and simultaneously performs automatic power generation control and primary frequency modulation, determining a current residual scheduling plan value according to the active power of the current grid-connected point and the acquired scheduling plan value of the automatic power generation control;

dividing the time of the next automatic power generation control period acquired from the EMP according to the average of first sub-periods, and determining an average scheduling plan value in each first sub-period according to the number of the first sub-periods and the residual scheduling plan value;

and issuing a first comprehensive scheduling instruction to each wind generating set of the wind power plant in each first sub-period, wherein the first comprehensive scheduling instruction is used for indicating the sum of an average scheduling plan value distributed by the wind generating set in each first sub-period and the scheduling plan value of primary frequency modulation in each first sub-period.

2. The method of active power regulation according to claim 1, further comprising:

3. The method of active power regulation according to claim 1, further comprising:

4. The method of active power regulation according to claim 1, further comprising:

5. The method of active power regulation according to claim 1, further comprising:

When the EMP is in a second automatic power generation control state and performs automatic power generation control and primary frequency modulation simultaneously, a second comprehensive scheduling instruction is issued to each wind generating set according to the current active power of the grid-connected point and the scheduling plan value of the automatic power generation control acquired from the EMP, and the second comprehensive scheduling instruction is used for indicating the sum of the scheduling plan value of the automatic power generation control distributed by the wind generating set and the scheduling plan value of the primary frequency modulation.

6. The method of active power adjustment according to any one of claims 1 to 5, characterized in that the method further comprises:

7. A method for regulating active power, characterized by being applied to an energy management platform EMP of a wind farm, the method comprising:

when automatic power generation control is performed, the automatic power generation control is in a first automatic power generation control state and primary frequency modulation is not performed, the control period of the automatic power generation control is divided evenly according to second sub-periods, an automatic power generation control instruction is issued to each wind generating set in each second sub-period, the automatic power generation control instruction is used for indicating a scheduling value of active power corresponding to the automatic power generation control distributed by the wind generating set, and the first automatic power generation control state is that the EMP performs automatic power generation control according to the scheduling value of the active power sent by a power grid side;

When the first automatic power generation control state is adopted, and the automatic power generation control and the primary frequency modulation are simultaneously carried out, the time from the next control period and the scheduling plan value of the automatic power generation control are determined.

8. The method for adjusting active power according to claim 7, wherein the issuing an automatic power generation control command to each wind turbine generator set in each second sub-period specifically includes:

9. The method of active power adjustment according to claim 7, characterized in that the method further comprises:

receiving a shutdown instruction sent by the VMP;

10. The method of active power adjustment according to claim 7, characterized in that the method further comprises:

when automatic power generation control is performed, the automatic power generation control is in a second automatic power generation control state and primary frequency modulation is not performed, a local automatic power generation control instruction is issued to each wind generating set in a control period of the automatic power generation control, wherein the local automatic power generation control instruction is used for indicating a scheduling value of corresponding active power distributed by the wind generating set when the automatic power generation control is performed locally, and the second automatic power generation control state is that the EMP performs the automatic power generation control according to the scheduling value of the active power input locally;

11. The method of active power adjustment according to any one of claims 7 to 10, characterized in that the method further comprises:

12. An active power conditioning apparatus, the apparatus comprising: a first memory, a first controller, a first interface, and a plurality of second interfaces;

The first interface is used for connecting an energy management platform EMP of the wind power plant;

each second interface of the plurality of second interfaces is used for connecting with a wind generating set;

the first memory stores an executable program;

the executable program, when executed by the first controller, implements the active power adjustment method of any one of claims 1 to 6.

13. An active power conditioning apparatus, the apparatus comprising: a second memory, a second controller, a third interface, and a plurality of fourth interfaces;

the third interface is used for connecting with a reactive power management platform VMP of the wind power plant;

each fourth interface of the plurality of fourth interfaces is used for connecting with a wind generating set;

the second memory stores an executable program;

the executable program, when executed by the second controller, implements the active power adjustment method of any one of claims 7 to 11.

14. A wind farm, characterized in that it comprises a plurality of wind power units and an active power regulating device according to claim 12 and claim 13 connected to each other.