CN105515061B

CN105515061B - A kind of Wind turbines active power controller method and system

Info

Publication number: CN105515061B
Application number: CN201610045810.8A
Authority: CN
Inventors: 郭成; 许守东; 陈勇; 宋忧乐; 赵泽平
Original assignee: Electric Power Research Institute of Yunnan Power System Ltd
Current assignee: Electric Power Research Institute of Yunnan Power System Ltd
Priority date: 2016-01-25
Filing date: 2016-01-25
Publication date: 2018-05-25
Anticipated expiration: 2036-01-25
Also published as: CN105515061A

Abstract

The embodiment of the invention discloses a kind of Wind turbines active power controller method and systems, the described method includes classifying according to Wind turbines participation wind power plant AGC lifting/lowering power control capabilities to Wind turbines, Wind turbines are divided into power per liter, drop power and the non-adjustable Wind turbines of power；The power per liter priority sequence of power per liter Wind turbines is set according to power per liter stability, sets power per liter priority sequence and allocation strategy；According to the drop power priority sequence of drop power stability setting drop power Wind turbines, setting drop power priority sequence and allocation strategy；According to wind power plant AGC lifting/lowerings power control requirements Wind turbines is controlled to perform power per liter or drop power operation.Wind turbines active power controller scheme provided by the invention, can take into full account influences the factor in running of wind generating set service life, is grouped according to the characteristics of above-mentioned factor, selects corresponding control sequence and strategy, active power regulation is carried out to Wind turbines, so as to slow down the aging of Wind turbines.

Description

Active power control method and system for wind turbine generator

Technical Field

The invention relates to the technical field of wind power generation, in particular to a wind turbine generator active power control method and system.

Background

With the increase of installed capacity of wind power, especially large-scale centralized access of wind power, the association degree of the wind power system and the power system is more and more compact. The technical difficulty of wind power predictability and controllability of wind power operation departments is increased, and how to reasonably control the active power output control of the wind turbine generator is a technical problem frequently encountered in the field of wind power.

In the related art, the output Control of the active power of the wind turbine generator is generally realized by an Automatic Generation Control (AGC) Control system of the wind farm. Wherein, to wind turbine generator system active power's output control, include: the active power control scheme of the wind power plant is based on real-time wind measuring data or ultra-short-term active power prediction data. Such a scheme is characterized in that: the possible optimal power and the maximum power of the single machine in the wind turbine generator are calculated according to the real-time wind measurement data or the ultra-short-term active power prediction data, the priority sequence of active power output control of the wind turbine generator is determined by combining the real-time active power of the wind turbine generator, and the optimal distribution of the scheduling instructions is realized according to the priority sequence. The method is based on the effective relation between the prediction data and the real-time active power of the wind turbine generator, the running state of the wind turbine generator is adjusted according to the ambient environmental factors of the wind turbine generator, the active power of the wind turbine generator is controlled, the factors influencing the running life of the wind turbine generator in the wind turbine generator are not considered, the running state of the wind turbine generator is not coordinated, the wind turbine generator is easy to age, and the service life of the wind turbine generator is shortened.

In summary, how to reasonably adjust the active power output of the wind turbine generator to reduce the aging degree of the wind turbine generator becomes a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

The embodiment of the invention provides an active power control scheme of a wind turbine generator, and aims to solve the technical problems that the wind turbine generator is easy to age and the service life of the wind turbine generator is shortened due to the fact that factors influencing the operation life of the wind turbine generator are not considered in the active power control scheme of the wind turbine generator in the prior art.

In order to solve the technical problem, the embodiment of the invention discloses the following technical scheme:

according to a first aspect of the present invention, there is provided a wind turbine active power control method, including:

classifying the wind turbines according to participation capacities of the wind turbines in different running states for participating in AGC up/down power control of a wind power plant, and dividing the wind turbines into a power-up wind turbine, a power-down wind turbine and a power-unadjustable wind turbine;

setting a power-up priority sequence of each group of wind turbines in the power-up wind turbines according to the power-up stability of the wind turbines in different operating states, respectively setting the power-up priority sequences of internal fans of the wind turbines in different operating states in the power-up wind turbines, and setting a power-up distribution strategy of the power-up wind turbines; and the number of the first and second groups,

setting power reduction priority sequences of all groups of wind turbines in the power reduction wind turbines according to the power reduction stability of the wind turbines in different operation states, respectively setting the power reduction priority sequences of internal fans of the wind turbines in different operation states in the power reduction wind turbines, and setting power reduction distribution strategies of the power reduction wind turbines;

controlling the wind turbine generator to execute power-up operation according to a set power-up priority sequence and a power-up distribution strategy according to the AGC power-up control requirement of the wind power plant; or,

and controlling the wind turbine generator to execute power reduction operation according to a set power reduction priority sequence and a power reduction distribution strategy according to the AGC power reduction control requirement of the wind power plant.

Preferably, the operating state of the wind turbine generator includes: a fault shutdown state, a normal operating state, a faulty operating state, an unregulated operating state, a low power operating state, and a free power generation state;

the liter power wind turbine generator comprises: the wind turbine generator comprises a wind turbine generator in a normal shutdown state, a wind turbine generator in a low-output running state and a wind turbine generator in a free power generation state;

the power reduction wind turbine generator comprises: the system comprises a wind turbine generator with a fault operation state, a wind turbine generator with a low output operation state and a wind turbine generator with a free power generation state;

the wind turbine generator system with the non-adjustable power comprises: a wind turbine in a fault shutdown state and a wind turbine in an unregulated operation state.

Preferably, the step of setting the power-up priority sequence of each group of wind turbines in the power-up wind turbines according to the power-up stability of the wind turbines in different operating states includes:

arranging the wind turbines in different running states in the power-up wind turbine generator according to the priority sequence of the power-up stability from high to low; the arranged wind turbine generator set sequentially comprises:

the wind turbine generator comprises a wind turbine generator in a low output state, a wind turbine generator in a free power generation state and a wind turbine generator in a normal shutdown state.

Preferably, the step of respectively setting the power-up priority sequences of the fans inside the wind turbine generator in different operating states includes:

setting a power-up priority sequence of each fan in the wind turbine generator set in the low-output state according to the accumulated generating running time of the fan, wherein the lower the accumulated generating running time of the fan is, the higher the power-up priority of the fan is;

setting a power-up priority sequence of each fan in the wind turbine generator in the free power generation state according to the real-time power of the fan, wherein the smaller the real-time output of the fan is, the higher the power-up priority of the fan is;

setting a power-up priority sequence of each fan in the wind turbine generator set in the normal shutdown state according to the ratio of the accumulated power generation running time to the accumulated shutdown time of the fan, wherein the smaller the ratio of the accumulated power generation running time to the accumulated shutdown time of the fan is, the higher the power-up priority of the fan is.

Preferably, the setting of the power-per-liter distribution strategy of the power-per-liter wind turbine generator set includes:

acquiring the current active power of a fan in the boost power wind turbine generator in real time;

acquiring the temperatures of a generator and a converter of the fan, and setting the active power increment of the fan according to the corresponding relation between the preset temperatures of the generator and the converter and the active power increment;

calculating the sum of the current active power and the active power increment to serve as the updated current active power;

judging whether the updated current active power reaches the fan power specified by the AGC power-up control requirement of the wind power plant;

if the updated current active power reaches the specified fan power, maintaining the fan to operate according to the fan power;

and if the updated current active power does not reach the specified fan power, calculating the sum of the updated current active power and the active power increment.

Preferably, the step of setting the power reduction priority sequence of each group of wind turbines in the power reduction wind turbine according to the power reduction stability of the wind turbines in different operating states includes:

arranging the wind turbines in different running states in the power reduction wind turbine generator according to the priority sequence of power reduction stability from high to low; the arranged wind turbine generator set sequentially comprises:

the wind turbine generator comprises a wind turbine generator in a free power generation state, a wind turbine generator with a fault operation state and a wind turbine generator in a low output state.

Preferably, the step of respectively setting the power-down priority sequences of the wind turbines in the wind turbine generators in different operating states includes:

setting a power reduction priority sequence of each fan in the wind turbine generator in the free power generation state according to the real-time power of the fan, wherein the larger the real-time power of the fan is, the higher the power reduction priority of the fan is;

setting a power reduction priority sequence of each fan in the wind turbine generator with the fault operation state according to the real-time power of the fan, wherein the higher the real-time power of the fan is, the higher the power reduction priority of the fan is;

and setting a power reduction priority sequence of each fan in the low-output wind turbine generator set according to the ratio of the accumulated generating operation time of the fan to the accumulated stopping time, wherein the higher the ratio of the accumulated generating operation time of the fan to the accumulated stopping time is, the higher the power-up priority of the fan is.

Preferably, the power-down distribution strategy of the power-down wind turbine generator set comprises:

acquiring the current active power of a fan in the power-reducing wind turbine generator in real time;

acquiring the temperatures of a generator and a converter of a fan in the power-reducing wind turbine generator, and setting the active power increment of the wind turbine according to the corresponding relation between the preset temperatures of the generator and the converter and the active power increment;

calculating the difference between the current active power and the active power increment as the updated current active power;

judging whether the updated current active power reaches the fan power specified by the AGC power-down control requirement of the wind power plant;

if the updated current active power reaches the fan power, maintaining the fan to operate according to the updated fan power;

and if the updated current active power does not reach the specified fan power, calculating the difference between the updated current active power and the active power increment.

According to the second aspect of the present invention, there is also provided a wind turbine active power control system, which is characterized by comprising:

a classification module; the system comprises a wind power generation set, a wind power generation set and a control system, wherein the wind power generation set is used for classifying wind power generation sets according to participation capacities of the wind power generation sets in different running states for participating in AGC up/down power control of a wind power station, and the wind power generation sets are divided into a power-up wind power generation set, a power-down wind power generation set and a power-unadjustable wind power generation set;

the power-up setting module is used for setting power-up priority sequences of all groups of wind turbines in the power-up wind turbines according to the power-up stability of the wind turbines in different operating states, setting the power-up priority sequences of internal fans of the wind turbines in different operating states in the power-up wind turbines, and setting a power-up distribution strategy of the power-up wind turbines; and the number of the first and second groups,

the power reduction setting module is used for setting power reduction priority sequences of all groups of wind turbines in the power reduction wind turbines according to the power reduction stability of the wind turbines in different operation states, setting the power reduction priority sequences of internal fans of the wind turbines in different operation states in the power reduction wind turbines, and setting a power reduction distribution strategy of the power reduction wind turbines;

the power-up execution module is used for controlling the wind turbine generator to execute power-up operation according to a set power-up priority sequence and a power-up distribution strategy according to the AGC power-up control requirement of the wind power plant; or,

and the power reduction execution module is used for controlling the wind turbine generator to execute power reduction operation according to a set power reduction priority sequence and a power reduction distribution strategy according to the AGC power reduction control requirement of the wind power plant.

Preferably, the classification module includes:

the boosted power wind turbine generator sorting submodule is used for sorting the wind turbines in different running states in the boosted power wind turbines according to the priority sequence of the boosted power stability from high to low; the arranged wind turbine generator set sequentially comprises: the wind turbine generator comprises a wind turbine generator in a low output state, a wind turbine generator in a free power generation state and a wind turbine generator in a normal shutdown state.

Preferably, the boost setting module includes:

the wind turbine generator power-up setting submodule in the low-output state is used for setting a power-up priority sequence of each fan in the wind turbine generator in the low-output state according to the accumulated generating operation time of the fan, wherein the lower the accumulated generating operation time of the fan is, the higher the power-up priority of the fan is;

the wind turbine generator power-up setting submodule in the free power generation state is used for setting a power-up priority sequence of each fan in the wind turbine generator in the free power generation state according to the real-time power of the fan, wherein the smaller the real-time output of the fan is, the higher the power-up priority of the fan is;

and the wind turbine generator power-up setting submodule in the normal shutdown state is used for setting a power-up priority sequence of each fan in the wind turbine generator in the normal shutdown state according to the ratio of the accumulated power generation operation time of the fan to the accumulated shutdown time, wherein the smaller the ratio of the accumulated power generation operation time of the fan to the accumulated shutdown time is, the higher the power-up priority of the fan is.

Preferably, the boost setting module includes:

the first current active power obtaining submodule is used for obtaining the current active power of a fan in the boost power wind turbine generator in real time;

the first active power increment setting submodule is used for acquiring the temperatures of a generator and a converter of the fan and setting the active power increment of the fan according to the corresponding relation between the preset temperatures of the generator and the converter and the active power increment;

the first current active power updating submodule is used for calculating the sum of the current active power and the active power increment to be used as the updated current active power;

the first current active power judgment submodule is used for judging whether the updated current active power reaches the fan power specified by the AGC power-up control requirement of the wind power plant;

the first wind motor operation control submodule is used for maintaining the fan to operate according to the fan power if the updated current active power reaches the fan power; or when the new current active power does not reach the fan power, calculating the sum of the updated current active power and the active power increment.

Preferably, the classification module includes:

the power-reducing wind turbine generator sorting submodule is used for sorting the wind turbines in different running states in the power-reducing wind turbine generators according to the priority sequence of power-reducing stability from high to low; the arranged wind turbine generator set sequentially comprises: the wind turbine generator comprises a wind turbine generator in a free power generation state, a wind turbine generator with a fault operation state and a wind turbine generator in a low output state.

Preferably, the power down setting module includes:

the wind turbine generator set power reduction setting submodule in the free power generation state is used for setting a power reduction priority sequence of each fan in the wind turbine generator set in the free power generation state according to the real-time power of the fan, wherein the larger the real-time power of the fan is, the higher the power reduction priority of the fan is;

the wind turbine generator set power reduction setting submodule with the fault operation state is used for setting a power reduction priority sequence of each fan in the wind turbine generator set with the fault operation state according to the real-time power of the fan, wherein the larger the real-time power of the fan is, the higher the power reduction priority of the fan is;

and the power reduction setting submodule of the wind turbine generator in the low output state is used for setting a power reduction priority sequence of each fan in the wind turbine generator in the low output state according to the ratio of the accumulative power generation operation time of the fan to the accumulative shutdown time, wherein the higher the ratio of the accumulative power generation operation time of the fan to the accumulative shutdown time is, the higher the power increase priority of the fan is.

Preferably, the power down setting module includes:

the second current active power obtaining submodule is used for obtaining the current active power of a fan in the power-reducing wind turbine generator in real time;

the second active power increment setting submodule is used for acquiring the temperatures of a generator and a converter of the fan and setting the active power increment of the fan according to the preset corresponding relation between the temperatures of the generator and the converter and the active power increment;

the second current active power updating submodule is used for calculating the difference between the current active power and the active power increment to be used as the updated current active power;

the second current active power judgment submodule is used for judging whether the updated current active power reaches the fan power specified by the AGC power reduction control requirement of the wind power plant;

the second wind motor operation control submodule is used for maintaining the fan to operate according to the specified fan power if the updated current active power reaches the specified fan power; or when the updated current active power does not reach the specified fan power, calculating the difference between the updated current active power and the active power increment.

According to the technical scheme, the active power control scheme of the wind turbine generator provided by the embodiment of the invention classifies the wind turbine generators in different operating states according to the participation capability of participating in AGC (automatic gain control) up/down power control of the wind power plant, so that the AGC up/down power control of the wind power plant adaptive to the wind turbine generators can be selected according to the operating states of the different wind turbine generators, and the condition that the operating life of the wind turbine generators is shortened due to the fact that the operating states of the wind turbine generators and the participation capability of AGC up/down power are not adaptive can be prevented. Meanwhile, the ascending power priority sequence of each wind turbine in the ascending power wind turbine is set according to the ascending power stability of the wind turbines in different operating states, the ascending power stability of the ascending power wind turbine can be ensured, the operating stability of the ascending power wind turbine is kept, and the operating life of the ascending power wind turbine is prolonged, meanwhile, the ascending power priority sequence of the fans in the wind turbines in different operating states is set, each fan in the wind turbines in different operating states can be operated orderly according to the ascending power requirement, and meanwhile, the ascending power distribution strategy of the ascending power wind turbine is set, so that the active power of the ascending power wind turbine is adjusted according to the ascending power distribution strategy, and the ascending power adaptability of each wind turbine is ensured, and the operating characteristics influencing the ascending power operating life of the wind turbines can be fully considered through the above modes, therefore, the service life of the wind turbine generator is ensured, and the aging and damage of the wind turbine generator are slowed down.

In the process of participating in AGC power reduction control of the wind turbines, the power-up priority sequence of each wind turbine in the power-down wind turbines is set according to the power-down stability of the wind turbines in different operating states, the power-down stability of the power-down wind turbines can be ensured, the operating stability of the power-down wind turbines is maintained, and therefore the operating life of the power-down wind turbines is prolonged, meanwhile, the power-down priority sequence of the fans in the wind turbines in different operating states is set, all the fans in the wind turbines in different operating states can be operated orderly according to the power-down requirement, meanwhile, the active power of the power-down wind turbines is adjusted according to the power-down distribution strategy by setting the power-down distribution strategy of the power-down wind turbines, so that the power-down adaptability of all the wind turbines is ensured, and through the above way, the operating characteristics influencing the power-down operating life of the wind turbines can be fully, therefore, the aging and the damage of the wind turbine generator are slowed down.

The beneficial effects of the invention include: the factors influencing the operating life of the wind turbine generator can be fully considered, the wind turbine generator is divided according to the characteristics of the factors, and corresponding control sequences and strategies are selected to adjust the active power of the wind turbine generator, so that the operating life of the wind turbine generator is ensured, and the aging and the damage of the wind turbine generator are slowed down.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

Fig. 1 is a schematic flow chart of a method for controlling active power of a wind turbine generator according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a method for setting a power-up priority sequence of a fan according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of a power-up allocation strategy according to an embodiment of the present invention;

fig. 4 is a flowchart illustrating a method for setting a power-down priority sequence according to an embodiment of the present invention;

fig. 5 is a schematic flow chart of a power down allocation strategy according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a first wind turbine active power control system according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a second active power control system of a wind turbine generator according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a third active power control system of a wind turbine generator according to an embodiment of the present invention.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic flow chart of a wind turbine active power control method according to an embodiment of the present invention, and as shown in fig. 1, the wind turbine active power control method includes the following steps:

s110: according to participation capacity of wind turbines in different running states in AGC up/down power control of a wind power plant, the wind turbines are classified and are divided into a power-up wind turbine, a power-down wind turbine and a power-unadjustable wind turbine.

The running state of the wind turbine generator is divided according to the running effect, and the method comprises the following steps: a fault shutdown state, a normal shutdown state, a fault operation state, an unregulated operation state, a low-output operation state and a free power generation state; the wind turbines in different operating states have different participation capacities in AGC up/down power control of the wind farm, and please refer to the following table, that is, table 1 shows:

TABLE 1

Class 1-wind turbine in a faulted shutdown state: the wind power plant is in a shutdown state due to the existence of faults, and cannot participate in AGC control of the wind power plant before the faults are eliminated;

class 2-wind turbine in normal shutdown state: because the wind turbine is in normal shutdown (such as man-made shutdown), the active power is zero, and the wind turbine can only participate in AGC power-up control of the wind power plant, but a certain time is needed for starting the wind turbine.

Category 3-wind turbine with faulty operating condition: the wind turbine generator is in a limited power operation state due to the fact that faults exist in the wind turbine generator, if power-up operation is performed forcibly, the damage degree of the wind turbine generator is aggravated, and therefore the wind turbine generator can only participate in the AGC power-down control process of a wind power plant in the regulation.

Generally, the wind turbines with the category 3 are rare, and specific marks are set to facilitate distinguishing, and such wind turbines with fault operation states do not participate in power-up regulation and only participate in power-down regulation, so that the wind turbines also enter wind power plant AGC power-down control. In fact, there are also wind turbines in standby state, but the main reason for the standby state is that the wind conditions have not yet reached the requirements of the power generation operation state, and as long as the wind conditions meet certain conditions, such wind turbines will enter a low-output operation state or a free power generation state.

Category 4-wind turbine generator in unregulated operating state: the wind turbine generator cannot receive a control command of AGC power up/down of the wind farm due to a communication terminal and the like, so that the wind turbine generator cannot perform power up and power down operations.

In the polling process of the wind turbine generator by the wind farm AGC control system, if the wind turbine generator with communication interruption is found, the wind farm AGC control system defines the wind turbine generator to be in category 4, and the wind turbine generator is in an unadjustable operation state. Therefore, the wind turbine generator in the non-adjustable operation state enters the power non-adjustable wind turbine generator for control.

Category 5-wind turbine generator in low-output operating state: the real-time output of the wind turbine generator is small, and the wind turbine generator can only participate in AGC power-up control; or the AGC is stopped and then participates in AGC power-down control after the power is increased to a certain power.

As a preferred embodiment, for a certain wind turbine that is in power generation operation, if the real-time active power output of the wind turbine is less than or equal to 100kW, the AGC control system of the wind farm defines that the wind turbine is in an operating state of less than 100kW, and the wind turbine is in a low-output state. In the operating state, the local end of the wind turbine can only participate in the power reduction control of the wind power plant through a remote shutdown command, and the AGC system of the wind power plant cannot distribute a power reduction command to the wind turbine and only gives a shutdown command; or will give a power up command; therefore, the wind turbine generator in the low-output state can simultaneously enter power reduction and power increase control.

Category 6-wind turbine in free power generation state: the wind turbine generator is in a normal operation state, and the output of the wind turbine generator is between the rated output and the minimum controllable output limit value.

As a preferred embodiment, for a wind turbine in power generation operation, if the real-time active output of such a wind turbine is greater than 100kW and less than 1450kW, the wind farm AGC control system defines such a wind turbine as a wind turbine in free power generation operation state. Under the operation state, the wind turbine generator unit receives the power-up control instruction and the power-down control instruction of the wind power plant AGC control system, so that the wind turbine generator unit can simultaneously enter the power-down control and the power-up control.

Therefore, if the wind power station is classified according to participation capacity of AGC up/down power control of the wind power station, the wind power station can be divided into an up power wind turbine, a down power wind turbine and a non-adjustable power wind turbine. Wherein,

the liter power wind turbine generator comprises: the wind turbine generator system comprises a wind turbine generator set in a normal shutdown state, a wind turbine generator set in a low-output running state and a wind turbine generator set in a free power generation state.

The power reduction wind turbine generator system comprises: the wind turbine generator system comprises a wind turbine generator set in a fault operation state, a wind turbine generator set in a low-output operation state and a wind turbine generator set in a free power generation state.

Because the wind turbines in different operating states have different power-rise operation stability in the power-rise wind turbine, the following steps need to be executed:

s120: setting the ascending power priority sequence of each group of wind turbines in different operating states in the ascending power wind turbines according to the ascending power stability of the wind turbines in different operating states, respectively setting the ascending power priority sequence of internal fans of the wind turbines in different operating states in the ascending power wind turbines, and setting the ascending power distribution strategy of the ascending power wind turbines.

The wind turbines in different running states in the boosted power wind turbine are ranked according to the priority sequence from high to low in the boosted power stability of the wind turbines, and the wind turbines in different states after ranking are sequentially as follows: the wind turbine generator comprises a wind turbine generator in a low output state, a wind turbine generator in a free power generation state and a wind turbine generator in a normal shutdown state.

The wind turbine generator set in the low output state has small real-time output and needs to be adjusted to high power at first, so that the wind turbine generator set in the low output state needs to be adjusted in power increasing mode at first, the wind turbine generator set in the running state is prevented from being too low in running power, the wind turbine generator set is damaged, and the running stability and the running life of the wind turbine generator set in the low output running state are further improved.

For the wind turbine generator in the free power generation state, because the output is between the rated power and the minimum controllable output limit value, the operation stability of the wind turbine generator is higher than that of the wind turbine generator in the low output state, but the active power is also very low, so after the wind turbine generator in the low output state is subjected to power-up regulation, if the AGC operation requirement of a wind power plant cannot be met, the power-up regulation and control of the wind turbine generator in the free power generation state are required.

Although the wind turbine generator in the normal shutdown state can participate in AGC up power regulation of a wind power plant, certain starting time is needed, and therefore, in order to guarantee the stability of the whole AGC operation process of the wind power plant, the wind turbine generator in the normal shutdown state needs to be started up at last.

In the process of carrying out AGC power-up regulation on the wind turbines in different operating states, the wind power plant can carry out polling operation on the operating states of all the wind turbines so as to obtain the operating states of different wind turbines, and then adjust the operating sequences of different wind turbines according to the sequencing mode according to the operating states.

Secondly, after the wind turbines in different operating states are sequenced, the power-up priority sequences of the fans in the wind turbines in different operating states need to be set respectively. Referring to fig. 2, fig. 2 is a schematic flow chart of a method for setting a power-up priority sequence of a fan according to an embodiment of the present invention, and as shown in fig. 2, the method for setting the power-up priority sequence of an internal fan of a power-up wind turbine generator is as follows:

s210: setting a power-up priority sequence of each fan in the wind turbine generator in a low-stress state according to the accumulated generating running time of the fan, wherein the smaller the accumulated generating running time of the fan is, the smaller the possibility that the fan is abraded in the running process is, and therefore, the smaller the accumulated generating running time of the fan is, the higher the power-up priority of the fan is.

S220: setting a power-up priority sequence of each fan in the wind turbine generator in a free power generation state according to the real-time power of the fan, wherein the smaller the power of the fan is, the longer the real-time power of the fan is from the rated power, and the higher the power-up priority of the fan needs to be adjusted first, so the smaller the real-time output of the fan is, the higher the power-up priority of the fan is.

S230: setting a power-up priority sequence of each fan in the wind turbine generator in a normal shutdown state according to the ratio of the accumulated power generation running time to the accumulated shutdown time of the fan, wherein the smaller the ratio of the accumulated power generation running time to the accumulated shutdown time of the fan is, the higher the power-up priority of the fan is.

In summary, for wind turbines in different operating states, the fans in the wind turbines need to be sorted according to the priority sequence, and in the actual AGC power-up operation process, the wind turbine with the highest priority needs to be operated according to the set priority sequence of the wind turbine, and then the power-up adjustment is performed on each fan in the wind turbine according to the priority sequence of each fan in the wind turbine; and carrying out AGC power-up regulation of the wind power plant in sequence according to the sequence.

The method comprises the following steps that seasonal factors are considered, internal parts of the wind turbine generator are damaged due to low temperature in winter, a main control system of the wind turbine generator is provided with a corresponding starting strategy, and the wind turbine generator in a normal shutdown state is basically rare; in summer, according to the principle that more wind turbines participate in power regulation, in order to avoid fatigue of key components of the wind turbines in long-term high-power operation due to high temperature, wind turbines in a normal shutdown state and wind turbines in a standby state are rare.

In order to make the adjustment of the power-up of each wind turbine in the power-up wind turbine controllable, a specific power-up distribution strategy needs to be implemented specifically for different power-up wind turbines, please refer to fig. 3, where fig. 3 is a schematic flow diagram of a power-up distribution strategy provided in an embodiment of the present invention, and as shown in fig. 3, the power-up distribution strategy includes the following steps:

s310: and acquiring the current active power of a fan in the boost power wind turbine generator in real time.

S320: and acquiring the temperatures of a generator and a converter of the fan, and setting the active power increment of the fan according to the preset corresponding relation between the temperatures of the generator and the converter and the active power increment.

S330: and calculating the sum of the current active power and the active power increment to serve as the updated current active power.

S340: judging whether the updated current active power reaches the fan power specified by the AGC power-up control requirement of the wind power plant; if the updated current active power reaches the fan power, executing step S350; and if the updated current active power does not reach the fan power, returning to execute the step S330.

S350: and maintaining the fan to operate according to the fan power.

Similarly, in the wind turbine with reduced power, the wind turbine with different operating states has different stability of reduced power operation, so the following steps need to be executed:

s130: setting power reduction priority sequences of all groups of wind turbines in the power reduction wind turbines according to the power reduction stability of the wind turbines in different operation states, respectively setting the power reduction priority sequences of internal fans of the wind turbines in different operation states in the power reduction wind turbines, and setting a power reduction distribution strategy of the power reduction wind turbines.

The method comprises the following steps of setting a power reduction priority sequence of each wind turbine in the power reduction wind turbines according to the power reduction stability of the wind turbines in different running states: and arranging the wind turbines in different running states in the power reduction wind turbine according to the priority sequence of the power reduction stability from high to low.

Among the wind turbine generator system of falling power after arranging, wind turbine generator system includes in proper order: the wind turbine generator comprises a wind turbine generator in a free power generation state, a wind turbine generator with a fault operation state and a wind turbine generator in a low output state.

The operating output of the wind turbine generator in the free power generation state is between the rated power and the minimum controllable output limit value, the operating power is relatively high, meanwhile, no fault exists, and the stability of the power reduction is strong, so that the wind turbine generator in the free power generation state needs to be adjusted firstly. Meanwhile, the wind turbine generator with fault operation has defects and poor power reduction stability, so that the wind turbine generator with low output power is low in real-time output power after sequencing, and needs to be stopped to participate in AGC power reduction control, and therefore, the wind turbine generator with low output power operation state needs to be finally adjusted in order to improve the efficiency of power reduction operation.

Secondly, after the wind turbines in different operating states are subjected to power reduction sequencing operation, power reduction priority sequences of all fans inside the wind turbines in different operating states need to be set respectively, and due to the fact that the operating states of all the wind turbines in the power reduction wind turbines are different, sequencing modes of the power reduction priority sequences of the fans inside the wind turbines are different for the wind turbines in different operating states. Referring to fig. 4, fig. 4 is a schematic flow chart of a method for setting a power-down priority sequence according to an embodiment of the present invention, and as shown in fig. 4, for a power-down wind turbine generator, the method for setting the power-down priority sequence of an internal fan thereof is as follows:

s410: and setting a power reduction priority sequence of each fan in the wind turbine generator in the free power generation state according to the real-time power of the fan, wherein the larger the real-time power of the fan is, the higher the power reduction priority of the fan is.

S420: and setting a power reduction priority sequence of each fan in the wind turbine generator with the fault operation state according to the real-time power of the fan, wherein the larger the real-time power of the fan is, the higher the power reduction priority of the fan is.

S430: and setting a power reduction priority sequence of each fan in the low-output wind turbine generator set according to the ratio of the accumulated generating operation time of the fan to the accumulated stopping time, wherein the higher the ratio of the accumulated generating operation time of the fan to the accumulated stopping time is, the higher the power-up priority of the fan is.

In summary, for wind turbines in different operating states, it is necessary to sequence the fans in the wind turbines in different operating states according to the power reduction priority sequence, and in the actual AGC power reduction operation process, it is necessary to operate the wind turbine with the highest priority according to the set power reduction priority sequence of the wind turbine, and then perform power reduction adjustment on the fans in the wind turbine according to the power reduction priority sequence of each fan in the wind turbine; and carrying out AGC power reduction regulation of the wind power plant according to the sequence.

In order to control the power reduction regulation process of each fan in the power reduction wind turbine generator, a specific power reduction distribution strategy needs to be specifically implemented for different power reduction wind turbine generators, and the power reduction distribution strategy of the power reduction wind turbine generator comprises the following steps:

s510: acquiring the current active power of a fan in the power-reducing wind turbine generator in real time;

s520: acquiring the temperatures of a generator and a converter of a fan in the power-reducing wind turbine generator, and setting the active power increment of the fan according to the preset corresponding relation between the temperatures of the generator and the converter and the active power increment;

s530: calculating the difference between the current active power and the active power increment as the updated current active power;

s540: judging whether the updated current active power reaches the fan power specified by the AGC power-down control requirement of the wind power plant; if the updated current active power reaches the specified fan power, executing step S550; if not, returning to execute the step S530;

and S550, maintaining the fan to operate according to the specified fan power.

By the method, the regulation of the power-rise priority sequence of each group of wind turbines in the power-rise wind turbines is set aiming at the power-rise wind turbines, the power-rise priority sequences of the internal fans of the wind turbines in different running states are set, and the power-rise distribution strategy of the power-rise wind turbines is set according to the specific conditions of the power-rise wind turbines.

Aiming at the power-down wind turbine generator, the adjustment of the power-down priority sequence of each wind turbine generator in the power-down wind turbine generator is set, the power-down priority sequences of the fans in the wind turbine generator in different running states are set, and the power-down distribution strategy of the power-down wind turbine generator is set according to the specific conditions of the power-down wind turbine generator.

After the above setting configuration is completed, the following can be performed:

step S140: controlling the wind turbine generator to execute power-up operation according to a set power-up priority sequence and a power-up distribution strategy according to the AGC power-up control requirement of the wind power plant; or,

step S150: and controlling the wind turbine generator to execute power reduction operation according to a set power reduction priority sequence and a power reduction distribution strategy according to the AGC power reduction control requirement of the wind power plant.

The wind turbines in different operating states are classified according to participation capabilities of the wind turbine AGC ascending/descending power control, so that the wind turbine AGC ascending/descending power control adaptive to the wind turbines can be selected according to the operating states of the different wind turbines, and the condition that the operating life of the wind turbines is shortened due to the fact that the operating states of the wind turbines and the participation capabilities of the ascending/descending power of the wind turbines do not adapt to each other can be prevented. Meanwhile, the ascending power priority sequence of each wind turbine in the ascending power wind turbine is set according to the ascending power stability of the wind turbines in different operating states, the ascending power stability of the ascending power wind turbine can be ensured, the operating stability of the ascending power wind turbine is kept, and the operating life of the ascending power wind turbine is prolonged, meanwhile, the ascending power priority sequence of the fans in the wind turbines in different operating states is set, each fan in the wind turbines in different operating states can be operated orderly according to the ascending power requirement, and meanwhile, the ascending power distribution strategy of the ascending power wind turbine is set, so that the active power of the ascending power wind turbine is adjusted according to the ascending power distribution strategy, and the ascending power adaptability of each wind turbine is ensured, and the operating characteristics influencing the ascending power operating life of the wind turbines can be fully considered through the above modes, therefore, the service life of the wind turbine generator is ensured, and the aging and damage of the wind turbine generator are slowed down.

In summary, the method for controlling the active power of the wind turbine generator provided by this embodiment can fully consider factors that affect the operating life of the wind turbine generator, group the factors according to the characteristics of the factors, select a corresponding control sequence and strategy, and adjust the active power of the wind turbine generator, thereby ensuring the operating life of the wind turbine generator and slowing down the aging and damage of the wind turbine generator.

Based on the same inventive concept, the embodiment of the present application further provides a wind turbine active power control system, and as the method corresponding to the system is the wind turbine active power control method in the embodiment of the present application, and the principle of the system for solving the problem is similar to that of the system, the implementation of the system can refer to the implementation of the method, and repeated parts are not described again.

Referring to fig. 6 specifically, fig. 6 is a wind turbine active power control system according to an embodiment of the present invention, and as shown in fig. 6, the wind turbine active power control system includes:

a classification module 601; the system comprises a wind power generation set, a wind power generation set and a control system, wherein the wind power generation set is used for classifying wind power generation sets according to participation capacities of the wind power generation sets in different running states for participating in AGC up/down power control of a wind power station, and the wind power generation sets are divided into a power-up wind power generation set, a power-down wind power generation set and a power-unadjustable wind power generation set;

a power-up setting module 602, configured to set a power-up priority sequence of each wind turbine in the power-up wind turbines according to power-up stability of the wind turbines in different operating states, set power-up priority sequences of internal fans of the wind turbines in different operating states in the power-up wind turbines, and set a power-up allocation policy of the power-up wind turbines; and the number of the first and second groups,

the power reduction setting module 603 is configured to set a power reduction priority sequence of each wind turbine in the power reduction wind turbines according to power reduction stability of the wind turbines in different operation states, set power reduction priority sequences of internal fans of the wind turbines in different operation states in the power reduction wind turbines, and set a power reduction allocation strategy of the power reduction wind turbines;

the power-up execution module 604 is configured to control the wind turbine generator to execute a power-up operation according to a set power-up priority sequence and a power-up distribution strategy according to an AGC power-up control requirement of the wind farm;

and a power reduction execution module 605, configured to control the wind turbine generator to execute a power reduction operation according to a set power reduction priority sequence and a power reduction allocation strategy according to the AGC power reduction control requirement of the wind farm.

Wherein, the running state of wind turbine generator system includes: a fault shutdown state, a normal operating state, a faulty operating state, an unregulated operating state, a low power operating state, and a free power generation state;

As shown in fig. 7, the classification module 601 in the foregoing embodiment includes:

a boosted power wind turbine generator sequencing submodule 6011, configured to rank, according to a priority order from high to low, wind turbines in different operating states of the boosted power wind turbines, the wind turbines in different operating states; the arranged wind turbine generator set sequentially comprises: the wind turbine generator comprises a wind turbine generator in a low output state, a wind turbine generator in a free power generation state and a wind turbine generator in a normal shutdown state.

As shown in fig. 7, the power-per-liter setting module 602 includes:

the wind turbine generator power-up setting submodule 6021 in the low-output state is used for setting a power-up priority sequence of each fan in the wind turbine generator in the low-output state according to the accumulated generating operation time of the fan, wherein the lower the accumulated generating operation time of the fan is, the higher the power-up priority of the fan is;

the wind turbine generator power-up setting submodule 6022 in the free power generation state is used for setting a power-up priority sequence of each fan in the wind turbine generator in the free power generation state according to the real-time power of the fan, wherein the smaller the real-time output of the fan is, the higher the power-up priority of the fan is;

the wind turbine generator power-up setting submodule 6023 in the normal shutdown state is configured to set a power-up priority sequence of each fan in the wind turbine generator in the normal shutdown state according to a ratio of an accumulated power generation operation time of the fan to an accumulated shutdown time, where a smaller ratio of the accumulated power generation operation time of the fan to the accumulated shutdown time is, a higher priority of the power-up of the fan is.

As shown in fig. 8, the power per liter setting module 602 further includes:

a first current active power obtaining submodule 6024, configured to obtain a current active power of a fan in the power-up wind turbine in real time;

the first active power increment setting submodule 6025 is configured to obtain temperatures of a generator and a converter of the fan, and set an active power increment of the fan according to a preset corresponding relationship between the temperatures of the generator and the converter and the active power increment;

a first current active power updating submodule 6026, configured to calculate a sum of the current active power and the active power increment as an updated current active power;

a first current active power judgment submodule 6027, configured to judge whether the updated current active power reaches a fan power specified by the AGC power-up control requirement of the wind farm;

a first fan operation control submodule 6028, configured to maintain the fan to operate according to the specified fan power if the updated current active power reaches the fan power; or when the updated current active power does not reach the fan power, calculating the sum of the new current active power and the active power increment.

As shown in fig. 7, the classification module 601 specifically includes:

a reduced-power wind turbine generator sequencing submodule 6012, configured to rank the wind turbines in different operating states in the reduced-power wind turbine generators according to a priority order of reduced-power stability from high to low; the arranged wind turbine generator set sequentially comprises: the wind turbine generator comprises a wind turbine generator in a free power generation state, a wind turbine generator with a fault operation state and a wind turbine generator in a low output state.

As shown in fig. 7, the power-down setting module 603 includes:

a free power generation state wind turbine generator derating setting submodule 6031, configured to set a derating priority sequence of each internal fan of the wind turbine generator in a free power generation state according to a real-time power of the fan, where the greater the real-time power of the fan is, the higher the derating priority of the fan is;

a power reduction setting submodule 6032 of the wind turbine generator with the fault operation state, configured to set a power reduction priority sequence of each fan in the wind turbine generator with the fault operation state according to the real-time power of the fan, where the larger the real-time power of the fan is, the higher the power reduction priority of the fan is;

the power reduction setting submodule 6033 of the wind turbine generator in the low output state is configured to set a power reduction priority sequence of each fan inside the wind turbine generator in the low output state according to a ratio of an accumulated power generation operation time of the fan to an accumulated downtime, where the higher the ratio of the accumulated power generation operation time of the fan to the accumulated downtime is, the higher the power increase priority of the fan is.

As shown in fig. 8, the power down setting module 603 in the foregoing embodiment includes:

a second current active power obtaining submodule 6034, configured to obtain, in real time, a current active power of a fan in the power-down wind turbine;

a second active power increment setting submodule 6035, configured to obtain temperatures of a generator and a converter of the fan, and set an active power increment of the fan according to a preset corresponding relationship between the temperatures of the generator and the converter IGBT and the active power increment; the temperature of the converter is mainly the temperature of an insulated gate bipolar diode (IGBT) in the converter.

A second current active power updating submodule 6036, configured to calculate a difference between the current active power and the active power increment as an updated current active power;

a second current active power determining submodule 6037, configured to determine whether the updated current active power reaches a fan power specified by the AGC power reduction control requirement of the wind farm;

a second fan operation control submodule 6038, configured to maintain the fan to operate according to the specified fan power if the updated current active power reaches the specified fan power; or calculating the difference between the updated current active power and the active power increment if the updated current active power does not reach the specified fan power.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing is directed to embodiments of the present invention, and it is understood that various modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention.

Claims

1. A wind turbine active power control method is characterized by comprising the following steps:

controlling the wind turbine generator to execute power reduction operation according to a set power reduction priority sequence and a power reduction distribution strategy according to the AGC power reduction control requirement of the wind power plant;

the setting of the power-rise distribution strategy of the power-rise wind turbine generator set comprises the following steps:

acquiring the temperatures of a generator and a converter in the fan, and setting the active power increment of the fan according to the corresponding relation between the preset temperatures of the generator and the converter and the active power increment;

if the updated current active power reaches the specified fan power, maintaining the fan to operate according to the specified fan power;

2. The active power control method for the wind turbine generator according to claim 1, wherein the operating state of the wind turbine generator comprises: a fault shutdown state, a normal operating state, a faulty operating state, an unregulated operating state, a low power operating state, and a free power generation state;

3. The active power control method for the wind turbine generator according to claim 2, wherein the step of setting the power-up priority sequence of each wind turbine generator in the power-up wind turbine generator according to the power-up stability of the wind turbine generators in different operating states comprises:

4. The active power control method for the wind turbine generator according to claim 3, wherein the method for respectively setting the power-up priority sequences of the fans inside the wind turbine generator in different operating states comprises the following steps:

setting a power-up priority sequence of each fan in the wind turbine generator set in the low-output state according to the accumulated generating running time of the fan, wherein the smaller the accumulated generating running time of the fan is, the higher the power-up priority of the fan is;

setting a power-up priority sequence of each fan in the wind turbine generator in the free power generation state according to the real-time power of the fan, wherein the smaller the real-time power of the fan is, the higher the power-up priority of the fan is;

5. The active power control method for the wind turbine generator according to claim 1, wherein the step of setting the power reduction priority sequence of each wind turbine generator in the power reduction wind turbine generator according to the power reduction stability of the wind turbine generators in different operating states comprises:

6. The active power control method for the wind turbine generator according to claim 5, wherein the step of respectively setting the power-down priority sequences of the fans inside the wind turbine generator in different operating states comprises:

7. The wind turbine active power control method according to claim 1, wherein the power-down distribution strategy of the power-down wind turbine comprises:

acquiring the temperatures of a generator and a converter of a fan in the power-reducing wind turbine generator, and setting the active power increment of the fan according to the preset corresponding relation between the temperatures of the generator and the converter and the active power increment;

8. The utility model provides a wind turbine generator system active power control system which characterized in that includes:

the power-up execution module is used for controlling the wind turbine generator to execute power-up operation according to a set power-up priority sequence and a power-up distribution strategy according to the AGC power-up control requirement of the wind power plant;

the power reduction execution module is used for controlling the wind turbine generator to execute power reduction operation according to a set power reduction priority sequence and a power reduction distribution strategy according to the AGC power reduction control requirement of the wind power plant;

the boost setting module comprises:

the first active power increment setting submodule is used for acquiring the temperatures of a generator and a converter in the fan and setting the active power increment of the fan according to the corresponding relation between the preset temperatures of the generator and the converter and the active power increment;

the first fan operation control submodule is used for maintaining the fan to operate according to the specified fan power if the updated current active power reaches the specified fan power; or when the updated current active power does not reach the specified fan power, calculating the sum of the updated current active power and the active power increment.

9. The wind turbine active power control system according to claim 8, wherein the operating state of the wind turbine comprises: a fault shutdown state, a normal operating state, a faulty operating state, an unregulated operating state, a low power operating state, and a free power generation state;

10. The wind turbine active power control system according to claim 9, wherein the classification module comprises:

11. The wind turbine active power control system according to claim 10, wherein the boost setting module includes:

the wind turbine generator power-up setting submodule in the low-output state is used for setting a power-up priority sequence of each fan in the wind turbine generator in the low-output state according to the accumulated generating running time of the fan, wherein the smaller the accumulated generating running time of the fan is, the higher the power-up priority of the fan is;

the wind turbine generator power-up setting submodule in the free power generation state is used for setting a power-up priority sequence of each fan in the wind turbine generator in the free power generation state according to the real-time power of the fan, wherein the smaller the real-time power of the fan is, the higher the power-up priority of the fan is;

12. The wind turbine active power control system according to claim 8, wherein the classification module comprises:

13. The wind turbine active power control system according to claim 12, wherein the power reduction setting module includes:

14. The wind turbine active power control system according to claim 8, wherein the power reduction setting module includes:

the second fan operation control submodule is used for maintaining the fan to operate according to the specified fan power if the updated current active power reaches the specified fan power; or calculating the difference between the updated current active power and the active power increment if the updated current active power does not reach the specified fan power.