TW201917283A - Wind farm and method of controlling same - Google Patents

Abstract

Provided is a wind farm with which, when a simultaneous cutout has occurred with respect to a plurality of wind power generation devices, a sharp decrease in the output of the wind farm as a whole is mitigated. The wind farm comprises a wind power generation device and a centralized control device which controls a plurality of wind power generation devices. The wind farm is characterized in that the centralized control device performs control such that, if two or more of the wind power generation devices, either simultaneously or in a predetermined period, have reached or exceeded a cutout wind velocity or have issued a shutdown request, a smaller number of wind power generation devices than the number of the wind power generation devices that, either simultaneously or in a predetermined period, have reached or exceeded the cutout wind velocity or have issued the shutdown request, are permitted to be stopped.

Description

Wind power plant and its control method

The present invention relates to a wind power plant equipped with a plurality of wind power generators and a control method thereof, and in particular to a wind power plant that stops operation of a wind power generator according to wind speed and a control method thereof.

In recent years, as one of the measures for global warming, wind power generation has been actively introduced all over the world. From the perspective of cost-effectiveness, wind power generation systems are mostly set up in a certain area with a plurality of wind power generation devices, and are installed in a manner of a wind power plant using a large number of wind power generation device clusters.

For the control of wind power plants, for example, in Patent Document 1, the following technology has been disclosed: monitoring the wind speed of individual wind power generation equipment, and when the average wind speed time of each windmill exceeds the threshold, the overall output reduction rate of the wind power plant is not excessive The method of increasing the size changes the operating state of each windmill to prevent abrupt output changes. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2006-170208

[Problems to be solved by the invention]

The power generation output of the wind power generator varies depending on the wind conditions, so there is concern about the influence on the maintenance of the voltage and frequency of the power system when the introduction of the power system further increases.

The wind power generation device changes the pitch angle of the blade to keep the rotation fixed, or changes the excitation current of the generator to control the power generation output to be fixed. With this, the wind power generator is configured such that, before the wind speed reaches the rated wind speed, the output increases together with the increase in the wind speed, and when the wind speed further increases, it operates at the rated output until the wind speed is cut out. This cut-out wind speed system generally sets the value of a predetermined safety factor for the fatigue prediction of the mechanical constituent elements accumulated due to the mechanical load acting on the machine of the wind turbine generator, and the economy based on the frequency of machine exchange, etc., to be set to The established wind speed.

In the case of a large number of wind power generators, at a wind speed faster than the cut-out wind speed, a safety function to stop the machine is provided for protection of the machine. At this stop, the output of the wind power generator system fluctuates sharply from the rated output to the output zero. In this regard, in a wind power plant, when a plurality of wind power generators reach the cut-out wind speed at the same time and stop, the output fluctuation of the entire wind power plant becomes extremely large.

On the other hand, the power system system in which a plurality of wind power generators are interconnected needs to sufficiently ensure the equipment capacity of the power generation station, etc., so that even if the output of the wind power generator varies, there is no obstacle in terms of adjustment. However, when the introduction of wind power generators increases and the scale of the wind power plant becomes larger, there is a problem that the equipment burden of the power company that maintains the power system becomes larger. For this reason, power companies are gradually demanding measures to suppress fluctuations in wind power generation companies in such a way as to limit the number of interconnected wind power generators or output fluctuations of wind power plants to fall within a predetermined range.

As mentioned above, there have been various proposals as a method for alleviating output fluctuations of wind power plants during strong winds.

The technique disclosed in Patent Document 1 periodically monitors and calculates the reduction rate of the power generation amount of the entire wind power plant to determine the stopping of each windmill. Therefore, the transition is short within the range that meets the condition of the calculated reduction rate. Time to generate a plurality of windmills that the wind power plant controller permits to stop, the amount of power generation may change greatly.

In addition, the technology disclosed in Patent Document 1 uses the parameters output by the turbine control system to determine the order of stopping permission. Therefore, windmills that remain stopped due to geographic characteristics, wind conditions, etc. may be concentrated in a specific group of windmills.

Based on the above, the present invention aims to provide a wind power plant and a control method thereof, which can alleviate the sudden decrease in the output of the wind power plant as a whole when the wind power plant simultaneously cuts out a plurality of wind power generation devices. [Technical means to solve the problem]

Based on the above, the present invention is "a wind power plant with: a wind power generation device; a centralized control device that controls a plurality of wind power generation devices; wherein, the centralized control device is the same or between a predetermined period, two or more of the foregoing When the wind power generation device reaches or exceeds the cut-out wind speed or issues a shutdown request, it is less than the number of wind power generation devices that reach or exceed the cut-out wind speed or issue a shutdown request at the same time or within a predetermined period. Device, control to stop permission". [Comparing the efficacy of the previous technology]

A control device and a control method for a wind power plant can be provided, which can alleviate the sudden decrease in the overall output of the wind power plant when the wind power plant simultaneously cuts out a plurality of wind power plants.

Hereinafter, an embodiment of the present invention will be described using drawings.

Prior to this, matters concerning the premise of the present invention will be described. First, the wind power generator is cut out by the independent protection operation of the wind power generator. In addition, the cut-out of the wind power plant is in the whole wind power plant, and multiple units may occur simultaneously. In addition, the stand-alone system of the wind power generator of the wind power generator may cause a cut-out delay due to its own condition (fatigue damage degree), and even if the delay is made, the long-term operation of the machine is not problematic or allowed. [Example 1]

FIG. 2 shows a configuration example of a general wind power plant to which the present invention is applied.

The wind power plant 100 includes the following: a plurality of wind power generators 1a, 1b, 1c, 1d, individual control devices 9a, 9b, 9c, 9d that control the wind power generators 1a, 1b, 1c, 1d, and on-site transformer equipment 40. Centralized control device 20 for controlling the wind power plant 100, etc.

In addition, in the wind power plant 100, the power generation outputs Pa, Pb, Pc, Pd of the wind power generators 1a, 1b, 1c, 1d are connected at one place in the plant, such as the plant transformer equipment 40, and are used as the wind power plant 100 The total output of is connected to the power system 50 via the transmission line 90, and the power generated at the wind power plant 100 is supplied to the user 30 via the power system. In addition, the centralized control device 20 and the individual control devices 9a, 9b, 9c, and 9d in the wind power generators 1a, 1b, 1c, and 1d are connected through the communication network 15 to perform information communication between them.

FIG. 3 shows a representative configuration example of the wind power generators 1a, 1b, 1c, and 1d. The wind turbine generator 1 of FIG. 3 has a tower 8, a nacelle 5 rotatably provided on the tower 8, a generator 6 installed in the nacelle 5, and a rotor 4 that drives the generator 6. The rotor 4 is composed of a plurality of Each blade 2, the hub 3, and the rotating shaft are comprised. The three blades 2 fixed to the hub 3 rotate to drive the generator 6 and generate electric power P.

In the nacelle 5 of the wind turbine generator 1, for example, individual control devices 9 (9a, 9b, 9c, 9d) of the wind turbine generator 1 (1a, 1b, 1c, 1d) are housed. The individual control device 9 uses the information of the rotor rotation speed detected by the rotation speed detector 10 to detect the rotation speed of the rotor rotating shaft, the wind speed and the wind direction detected by the wind meter 11, etc., to control the pitch angle of the blade 2 7 Give control signals. By changing the pitch angle of the blade 2, the rotation speed of the rotor can be controlled. In addition, the individual control device 9 can control the yaw motor that changes the direction of the nacelle 5 to adjust the yaw angle. The anemometer 11 is installed in the vicinity of the wind power generator 1, for example, in the nacelle 5, and measures the wind direction, wind speed, and air pressure etc. which the wind power generator 1 receives. In addition, the individual control device 9 controls the pitch angle of the blade 2 to the angle of feathering or stalling according to the situation, and decelerates the rotation speed of the rotor 4, depending on the situation, the inertial brake device 16 of the rotor rotation can be used to stop the rotation of the blade / Deceleration, after which the rotor rotation can be fixed manually or automatically with the rotor lock.

As shown in FIG. 3, in the wind turbine generators 1a, 1b, 1c, and 1d, the individual anemometers 11 are connected to individual individual control devices 9a, 9b, 9c, and 9d. In addition, as shown in FIG. 2, the individual control devices 9 a, 9 b, 9 c, and 9 d are connected to the centralized control device 20 via the communication network 15. In addition, a memory device (not shown) is connected to the centralized control device 20, and the operation information of each wind power generator 1a, 1b, 1c, 1d is memorized sequentially.

As described above, the individual control device 9 of the present invention is configured to give a stop command to the pitch angle control device 7 or the brake when the wind speed detected by the anemometer 11 reaches the preset cut wind speed of each wind power generator The device 16 stops the rotation of the blade 2, and before stopping the power generation control of the generator 6, first sends a stop request to the central control device 20 side, and moves to a specific stop action with the permission of the stop from the central control device 20 side .

FIG. 4 is a flowchart showing the processing contents when the cut-out wind speed of the individual control device 9 arrives. The flow of FIG. 4 is started at a cycle of 1 second, for example. In the first processing step S90, the individual control device 9 obtains the wind direction and wind speed information from the anemometer 11, and in the processing step S91, the cabin is obtained at a predetermined time such as the last 10 minutes The average wind speed. The average value derivation process can be obtained by, for example, a 10-minute moving average per cycle.

In processing step S92, the calculated average wind speed is compared with a preset cut-out wind speed to detect whether the cut-out wind speed is exceeded. This test can be confirmed by further continuation of this state. When the cut-out wind speed is not exceeded, the process returns to the first processing step S90, and the processing from the processing step S90 to the processing step S92 is repeatedly executed in cycles.

The detection of whether the cut-out wind speed is exceeded is compared with the average wind speed in order to confirm the continuation of the overrun condition, but it can also be based on other statistical values, instantaneous wind speed, etc.

When the wind speed exceeds the cut-out wind speed, the process moves to step S93, and the stop request of the wind power generator 1 is transmitted to the centralized control device 20 via the communication network 15. In this case, for example, the wind direction and wind speed information of the wind power generator 1a can be transmitted at the same time, or the wind direction and wind speed information can be transmitted because the average wind speed exceeds the cut-out wind speed, thereby changing to the one requiring the stop of the wind power generator 1a message. After the wind power generator 1a transmits the stop request, it enters the standby state at step S94. That is, even if the average wind speed exceeds the cut-out wind speed, the pitch control device or the brake device 16 is not directly controlled to stop the power generation operation of the wind power generator 1a, but is reported to the centralized control device 20 and the instructions are followed.

In the processing step S95, when there is a return from the centralized control device 20, in the processing step 96, it is confirmed that the content of the return is a stop permission signal or a standby signal that permits the stop of the wind power generator 1, and if it is a stop permission signal, Moving to the next processing step S97, in the case of the standby signal, the standby is continued. In processing step S97, the individual control device 9 transmits a control command to the pitch control device, and drives the inertial brake device 16 as appropriate to stop the rotor rotation and power generation operation of the wind power generator 1a. After confirming the stop, in step S98, a stop completion report is sent to the central control device 20.

In addition, the stand-by here refers to continuous power generation. Specifically, for example, the operation state of the windmill when the stop request is transmitted is continued. As another method, in a standby state, each wind power generator may limit the output at a predetermined ratio. In addition, in the present embodiment, although the case where the centralized control device 20 sends back the standby signal is described, it is possible to send only the permission signal.

In addition, the flow chart of FIG. 4 is shown by extracting only the part that focuses on stopping the operation. Therefore, although a part of the description is omitted, during normal operation, the communication with the centralized control device 20 through the communication network 15 is performed as appropriate. Information transmission.

In addition, in the above description, although the standby control is sent back to the central control device 20 for permission to stop, when the higher wind speed is exceeded during standby, it can be stopped without waiting for permission for protection.

FIG. 14 is a flowchart illustrating the processing contents when the cut-out wind speed of the centralized control device 20 of this embodiment is reached. First, in process S01, through the processing in the individual control device 9 described in FIG. 4, the centralized control device 20 receives the stop request from the individual control device 9 as appropriate. In process S02, it is confirmed whether the stop request is received from the plurality of individual control devices 9 at the same time or within a predetermined short period of time. When the stop request is received from only one individual control device 9, in process S03, a stop permission command is sent to the individual control device 9. When receiving a stop request from a plurality of individual control devices 9, in process S04, any one of the individual control devices 9 is selected to send a stop permission command, and the process returns to the process S01 of confirming whether or not to receive the stop request. This processing cycle can be performed in a predetermined time period. Through the above control, even if a plurality of individual control devices 9 are concurrently or concentratively determined to be stopped in a short period of time, the central control device 20 does not simultaneously send a stop permission for processing, so the wind power plant as a whole , Can suppress the rapid power generation fluctuations.

In addition, although the stop permission is sent one at a time in FIG. 14, for example, the stop permission may be issued more than two at a time. In other words, when a plurality of wind turbines receive a stop request at the same time or within a predetermined period, the wind turbines of a smaller number than the number of the stop request received at the same time or during the period issue a stop permission. In addition, in other words, when a stop request is received from multiple units simultaneously or within a predetermined period, at least one or more windmills do not issue a stop permission. In addition, in this embodiment, although the stop request is explained, the same kind of effect can be obtained when it is changed to another operation state change request.

FIG. 5 shows the output characteristics of the wind turbine generator 1 as a stand-alone unit, and is a characteristic diagram illustrating the relationship between the wind speed [m/s] and the output [W] of the wind turbine generator. The horizontal axis is the wind speed V, the vertical axis is the output P of the wind turbine generator in a single unit, and the rated power Prated is described on the vertical axis.

In general, kinetic energy of wind = (1/2) × "mass of wind [kg]" x "square of wind speed" 　　 mass of wind per unit time [kg/s] = cross-sectional area [m2] × air density [kg /m3]×Wind speed [m/s] 　　Electric wind power [W]=(1/2)דCross-sectional area[m2]דAir density[kg/m3]”דCubic wind speed[m/s] ". Therefore, although the wind power generators 1a, 1b, 1c, and 1d depend on the change of the output coefficient and the conversion efficiency before the wind speed V reaches the rated wind speed V1 of the wind power generator, the output increases approximately proportional to the cube of the wind speed.

When the wind speed V is further increased, the wind power generators 1a, 1b, 1c, 1d are configured to control the rotation frequency by adjusting the blade pitch angle and torque, so the rated output (100%) is used until the wind speed V2 is cut out Operation (rated operation). Specifically, for example, the wind speed at which the wind power generator starts to rotate (cut-in) is 3 m/s, the rated wind speed V1 is 12 m/s, and the stop wind speed V2 (cut-out) is 25 m/s. In addition, the cut-out wind speed of the wind power generator is set for the wind speed of the mechanical constituent elements caused by the mechanical load acting on the wind power generator to ensure a predetermined safety factor of the wind speed or based on the economy of equipment exchange and the like Wind speed. In addition, although the power generation output during the rated operation may vary within a predetermined range, it is preferable that the system between the rated wind speed and the cut-out wind speed is substantially fixed. In terms of safety functions, the wind power generators 1a, 1b, 1c, and 1d are stopped for equipment protection at wind speeds (stop wind speeds) that are faster than the wind speed V2, which is the cut-out wind speed.

With regard to each wind power generator in the wind power plant, the threshold value of the wind speed to be described later may be set to a value greater than the rated wind speed V1 and lower than the stop wind speed V2 (cut-out wind speed), or may be set to the cut-out wind speed or more.

FIG. 6 is a characteristic diagram illustrating the relationship between the wind speed [m/s] and the output [W] of a plurality of wind power generators in the wind power plant 100. The horizontal axis represents the representative wind speed V of the wind power plant, and the vertical axis represents the combined output 4XP of a plurality of wind power generation devices in the wind power plant 100 (here, 4 units are taken as an example), and the vertical axis represents 4 units. The combined output of the rated power is recorded 4XPrated.

Although the figure shows the characteristics of the combined output of four wind turbines, the wind turbines constituting the wind power plant are geographically close to each other and are often installed. Even if each wind turbine is individually controlled and judged In this case, the combined output basically has the same tendency as the output characteristics of the wind turbine generator of FIG. 5 in a single unit, so the explanation here will be omitted.

5 and 6 illustrate the operation at a wind speed lower than the stop wind speed V2 (cut-out wind speed), and in FIGS. 7, 8 and 9 illustrate the operation of a plurality of wind power generators in the wind power plant 100 In this case, the operation is performed at a wind speed higher than the stop wind speed V2 (cutout wind speed).

First, FIG. 7 shows the output change of the wind power plant 100 at the time T before and after the wind speed V that increases with time and exceeds the stop wind speed V2 (cut wind speed) when the control of this embodiment is not used as a comparative example. Figure. Before reaching the stop wind speed V2 (between T1 and T2), the individual control device 9 makes the pitch angle of the blade 2 variable or adjusts the torque, so that the output is separately fixed. As a result, in the wind power plant 100 Realize 4XPrated in terms of synthesis output.

In response to this, at the time T2 when the wind speed V exceeds the stop wind speed V2 (cut-out wind speed), the individual control devices 9 installed in the neighboring windmills respectively detect that the wind speed exceeds, and the central control device 20 is not particularly communicated if it is not provided. If the centralized control device 20 is installed but the power plant control of this embodiment is not installed, a stop request (shutdown request ST) is transmitted to the centralized control device 20, and the centralized control device 20 immediately gives a stop permission to each request. For this reason, almost all of the wind power generators 1a, 1b, 1c, and 1d stop at the same time, and the output of the wind power plant 100 decreases sharply, which greatly affects the power system.

FIG. 8 is a diagram illustrating the output change of the wind power plant 100 at the time T before and after the wind speed V exceeds the stop wind speed V2 (cut wind speed) when the power plant control of the present embodiment is installed. In this embodiment, as an indicator, when the representative wind speed V of the wind power plant exceeds the stop wind speed V2 (cut-out wind speed), as in the previous comparative example, the individual control devices 9 installed in the four wind turbines are considered at close time The case where a stop request is sent centrally. As described with reference to FIG. 14, when a plurality of stop requests are received at the same time or in a short time, the centralized control device 20 sequentially sends permission commands, so the stop timing of the plurality of windmills may deviate. As a result, the wind power generators 1a, 1b, 1c, and 1d are sequentially stopped at T2, T4, T5, and T6 in sequence, and the power generation amount of the entire wind power plant decreases to a substantially stepped shape, and there are many windmills The bottom becomes roughly sloped.

FIG. 10 is a block diagram illustrating the configuration of the centralized control device 20 related to the present invention. In FIG. 10, the centralized control device 20 includes a transceiver unit (not shown) connected to the communication network 15, and a control unit 31 connected to a memory device (not shown). At the control unit 31, the wind power generators 1a, 1b , A plurality of shutdown requests ST issued by the individual control devices 9 in 1c and 1d are processed. Here, the shutdown requests ST1, ST2, ST3, and ST4 are issued by the individual control devices 9a, 9b, 9c, and 9d in the wind power generators 1a, 1b, 1c, and 1d, respectively, and the shutdown permission instructions OP1, OP2, OP3, and OP4 are directed toward Individual control devices 9a, 9b, 9c, 9d to the wind power generators 1a, 1b, 1c, 1d.

The control unit 31 can set the order of issuing permits based on a predetermined rule as the control above the process of simply changing the timing of stopping permission. In this case, the specific processing content of the closing order determination process of the control unit 31 is shown in FIG. 1. This processing is performed based on the following premises. First, the cut-out of the wind power generator is performed based on the autonomous protection operation of the single unit of the wind power generator, and this point has been described. In addition, the cut-out of the wind power plant is in the whole wind power plant, and a plurality of units may be concentrated at the same time or in a short time. In addition, the wind power generation unit of the wind power generation unit is set with a margin of safety and economy to set the cut-out wind speed, which may occur in a state where the cut-out wind speed is exceeded due to the condition of the machine (such as fatigue damage) Continuous operation, even if it is delayed, the machine's long-term operation is still no problem or allowed.

The shutdown sequence determination process of FIG. 1 is activated by receiving the shutdown request ST from the individual control device 9. The processing of FIG. 1 is executed at an appropriate cycle after the activation. In the first processing step S200, when receiving the shutdown request ST (stop request) issued by the individual control device 9, a shutdown request reception list is created in processing step S201. In addition, when a shutdown request ST has been received from another individual control device 9, it is added to the list. The closing request reception list may include information on various signals detected by the individual control device 9 in addition to the ID of the individual control device 9 that sent it. In addition, the past operation results of the wind power generators 1a, 1b, 1c, and 1d are separately stored in a memory device (not shown), and can be referred to from the control unit 31 as appropriate.

Due to the above-mentioned processing steps S200 and S201 of FIG. 1, the shutdown request ST is received from the individual control devices 9a, 9b, 9c, and 9d of the plurality of wind turbine generators 1a, 1b, 1c, and 1d in the shutdown request reception list. In the present invention, the stop permission may be determined in the order of the faster one, but in a state where a plurality of shutdown requests ST are received, the processing of the next processing step S202 is performed.

In processing step S202, the stop sequence is determined for the plurality of shutdown requests ST. At this time, a stop sequence list is created. There may be various ways to determine the stop sequence list. For example, referring to the wind direction, the order is determined from the upwind side. Or, decide the order from the faster during the operation period. Or, determine the order in consideration of the degree of deterioration. Or you can refer to past experience. Or, the order with the larger output as the priority. In addition, the stop sequence is fixed once determined, and can be appropriately changed according to the environmental conditions at the time. In addition, although the stop permission is given according to the stop order list, the wind power generators 1a, 1b, 1c, 1d that have been stopped are excluded from the stop order list, or if a stop permission is requested afterwards, re-examination is performed at the same time as the addition The overall order is handled in this way.

In the next stage, the shutdown permission commands OP1, OP2, OP3, OP4 are sent to the individual control devices 9 of the wind power generators 1a, 1b, 1c, 1d. The processing in this case considers the following cases: the centralized control device 20 transmits individually so as to confirm the stop of each windmill one by one; and transmits simultaneously to reduce the processing load of the centralized control device 20. In the processing step S203, an example of individual transmission is described, and in the processing step S207, an example of simultaneous transmission is described.

In the case of individual transmission, in the processing step S203, referring to the created stop sequence list, the shutdown permission command OP1 is sent to the individual control device 9 of the wind turbine generator 1a to be stopped first, and in the processing step S204, the individual wind turbine generator 1a The control device 9 waits for the execution and ends the reception of the stop confirmation report. If there is a confirmation report, at processing step S205, refer to the stop sequence list to perform a complete machine stop confirmation, and if there are remaining wind turbines 1 that have not been stopped, at processing step S206, refer to the stop sequence list and specify the next stop The individual control device 9 of the wind power generator 1b. After that, it returns to the processing step S203 again, and repeatedly executes a series of processing targeted at the individual control device 9 of the wind turbine generator 1b. When it is confirmed in the process step S205 that the whole machine is stopped, the control of the central control device 20 of the wind power plant 100 is terminated and the response is exceeded.

In addition, in the above sequence of individual transmission, although only the sequence is defined, it is also possible to define the period between giving the shutdown permission command OP to the wind turbine 1 that is to be stopped after sending a stop permission to an individual control device 9, and adjust the timing as appropriate Wait.

In addition, in the case of simultaneous transmission, in step S203, referring to the created stop sequence list, the shutdown permission commands OP1, OP2, OP3, OP4 are transmitted to the individual control devices 9 of all the wind turbine generators 1a, 1b, 1c, 1d. In this case, in the stop sequence list, each wind power generator 1a, 1b, 1c, 1d contains information on the start time of the stop. For example, the wind turbine 1a that was initially allowed to stop is set to zero after the reception of the shutdown permission command OP1, which can be immediately stopped, and then the wait time after the reception of the shutdown permission command OP2 to be stopped is set to 10 minutes, after 10 minutes of permission, permission to enter and stop to start the operation.

In the processing step S208, as in the foregoing processing step S204, the individual control device 9 of the wind turbine generator 1 waits for execution and ends the reception of the stop confirmation report. In this case, it is better to manage the reception period of the stop confirmation report. For example, when the wind power generators 1a and 1b are stopped in this order, the stop operation is entered at a time interval of 10 minutes, so for example, there is a stop confirmation report in the period of 9 minutes to 11 minutes so that it can be confirmed that a series of deal with.

If there is a confirmation report, at processing step S209, refer to the stop order list to perform a complete machine stop confirmation, and if there are remaining wind turbines 1 that have not been stopped, return to processing step S208 to manage the remaining stop confirmation report. In addition, in the case where it is confirmed in the process step S209 that the whole machine is stopped, the control of the central control device 20 of the wind power plant 100 is ended when the cut-out wind speed exceeds.

In addition, in the present embodiment, in the case of simultaneous transmission, although the process of confirming whether the whole machine is stopped is entered in S209, it is not necessary to confirm after simultaneous transmission.

As explained in FIG. 1, the individual control device 9 of the wind power generator 1 is not ranked according to the prior wind condition information, but only needs to be shut down by issuing a request to each machine of the wind power generator 1 at S200-S202. Of the wind power generator 1 requests a report and permission from the centralized control device 20. In this way, the efficiency aspects according to the embodiments of the present invention can be exemplified as follows: there is no need for the individual control device 9 to constantly send information (close related information), and the centralized control device 20 side does not need a calculation load that requires frequent programming.

FIG. 11 is a brief description of the coordinated actors of the individual control device 9 and the centralized control device 20 of the wind power generator 1 described above. According to this, at least one of the individual control devices 9 of the plurality of wind turbine generators 1 performs the processing steps S01 and S02. At processing step S01, it is detected that the wind speed of the nacelle of the wind power generator is equal to or greater than the cut-out wind speed, and at processing step S02, a shutdown request ST is sent from the individual control device 9 to the centralized control device 20.

In the centralized control device 20, the processing steps S03 to S06 are performed. At processing step S03, the centralized control device receives the shutdown request ST, at processing step S04, a reception list of shutdown requests except for the shutdown permission has been sent is created at a predetermined time period, at processing step S05, the centralized control device determines the shutdown sequence, and processes In step S06, the centralized control device sends a shutdown permission OP to the individual control device. This process repeats the process for all the individual control devices 9 of the plurality of wind turbine generators 1 required. In addition, after performing the instruction to the individual control device 9 of the wind power generation device 1 in S06, without returning to S04, the newly added shutdown request can be added to the list, and all the lists prepared for a predetermined period can be sent Turn off the permission signal.

The individual control devices 9 of the plurality of wind turbine generators 1 finally received in this process perform the processing steps S07 and S08. At processing step S07, the shutdown permission OP is received from the centralized control device, and at processing step S08, the individual control device performs shutdown.

In the embodiment of the present invention shown in FIG. 11, the predetermined cycle preset in the centralized control device 20 is regarded as simultaneous or short time, and the shutdown request sent during the cycle is stored in the queue (stop sequence list ), the order is determined based on the priority for the wind power generator 1 in the list, and the sequential stop permission signal is sent back. As for the wind power generator 1 that enters the stop order list of the simultaneous or predetermined period, since it must enter the sequence processing, it can exert the following effects: When the shutdown request occurs at approximately the same time, that is, after the priority is high (for example When the wind turbine generator 1 with a high cumulative damage degree requires shutdown, the wind turbine having a high priority is shut down preferentially (interruption processing), and a plurality of wind turbine generators 1 are collectively shut down and avoided at the same time. Compared with the case of entering the sequence processing only when the conditions such as the rate of change of the power generation amount are met, the shutdown request sent within a predetermined short period of time enters the sequence processing, which makes it possible to suppress the fluctuation of the power generation amount and improve Adjustment effect of life control. [Example 2]

FIG. 12 is a block diagram illustrating the configuration of the centralized control device 20 according to Embodiment 2 of the present invention. In the second embodiment, the description will be made regarding the generation of the fatigue evaluation results based on the past operation experience of the plurality of wind turbine generators 1 in the stop sequence. FIG. 12 is basically the configuration of FIG. 10 in which the information of the fatigue evaluation result M sent by each wind power generator 1 to the shutdown request ST is added to the input signal.

In FIG. 12, the centralized control device 20 includes a transceiver unit (not shown) connected to the communication network 15 and a control unit 41 connected to a memory device (not shown). The control unit 41 processes the wind power generators 1 a and 1 b , A plurality of shutdown requests ST issued by the individual control devices 9 in 1c and 1d, and information on the fatigue evaluation result M sent therewith. Here, shut down requests ST1, ST2, ST3, ST4, fatigue evaluation results M1, M2, M3, M4 are the individual control devices 9a, 9b, 9c, 9d in the wind power generators 1a, 1b, 1c, 1d, shut down The permission commands OP1, OP2, OP3, and OP4 are directed to the individual control devices 9a, 9b, 9c, and 9d in the wind power generators 1a, 1b, 1c, and 1d, respectively.

In this case, the basic processing procedure is as described in the first embodiment, but when setting the stop sequence, referring to the information of the fatigue evaluation result M, the depleted wind power generator 1 is stopped at an early time. Specifically, the value of the fatigue evaluation result M sent at the same time is compared with the sequence of the closing request list received and listed by the central control device 20 at the same time or within a predetermined period, and the windmill with the large fatigue evaluation result M is set to the upper level order of. Continuous operation in a state where the wind speed is above the cut-off speed and waiting for the shutdown request causes a load on the windmill compared to the case where it immediately stops. According to the above control, the plurality of wind power generators in the entire wind power plant can be adjusted to have the same life span. In addition, the stop sequence can also be determined by adjusting the remaining life in accordance with the maintenance time.

The adjustment of the total power generation fluctuation of the wind power plant is given the highest priority, and when the sequence of shutdown requests is performed based on the power generation status of each windmill, etc., there are windmills that are ultimately determined according to the wind condition tendency of the land where the wind power generator 1 is installed, etc. The possibility of stopping the deviation of the priority order may concentrate fatigue, but it can be adjusted through the processing of this embodiment.

Here, in the second embodiment of the present invention, in order to stop the sequence creation, it is proposed to proceed from the point of view of life management. The specific method of obtaining the life is not the purpose. For the method of estimating the life of the wind power generator 1, for example, the description can be used. Published in Japanese Patent Application Publication No. 2015-117682, "Introduction to Windmill Engineering" by Niu Shanquan, 2nd Edition, Senbei Publishing, issued on August 13, 2013, and realized by P81-98 technology. [Example 3]

In the first embodiment, the case where the stop sequence and the waiting time are set on the side of the centralized control device 20 will be described. However, when the individual control device 9 in the wind power generator 1 sends a shutdown request, the shutdown permission waiting time will be sent at the same time. To the central control device 20 side.

13 is a concise description of the coordinated actors of the individual control device 9 and the centralized control device 20 of the wind power generator 1 in the third embodiment. According to this, any one of the individual control devices 9 of the plurality of wind turbine generators 1 performs the processing steps S01, S09, and S02A. In the processing step S01, it is detected that the wind speed of the nacelle of the wind power generator 1 is equal to or higher than the cut-out wind speed, and in the processing step SS09, a waiting time Tw (closing scheduled time or delay time) is set. In the setting of the waiting time Tw (the scheduled closing time), although it may be randomly generated, it can be set based on the prediction of the fatigue condition and wind condition, and the individual control device 9 judges the limit time at which the standby can be stopped. The delay time deviation makes it possible to suppress the simultaneous stop of multiple units. At processing step SS02A, the individual control device 9 sends the shutdown request ST and the delay time Tw to the centralized control device 20.

The centralized control device 20 performs the processing steps S03, S04, S05A, and S06. At processing step S03, the central control device receives the shutdown request ST, at processing step S04, a reception list of shutdown requests except for the shutdown permission has been sent is created at a predetermined time period, and at processing step S05A, although the centralized control device determines the shutdown sequence, At this time, it is determined that the waiting time Tw (closing scheduled time) has priority. In the processing step S06, the centralized control device transmits the shutdown permission OP to the individual control device. This process repeats the process for all the individual control devices 9 of the plurality of wind turbine generators 1 required.

Upon receiving the individual control devices 9 of the plurality of wind turbine generators 1 that are requested to be shut down, the processing steps S07, S08, and S10 are performed. In the processing step S07, when the shutdown permission OP can be received from the centralized control device 20 within the delay time, in the processing step S08, the individual control device performs shutdown. When accepting permission and closing, you can start to stop the operation when you receive the permission to close, or you can start to stop the operation after the set delay time. On the other hand, if the centralized control device and the communication cable do not function, or many wind power generators request shutdown, so that the shutdown permission signal cannot be received before the delay time set by the individual control device 9 elapses, it is detected in processing step S10 When the delay time elapses, the delay is performed only in the state of the delay time generated in the processing step SS09, and the processing in the processing step S08 is performed.

According to the third embodiment of the present invention, it is possible to provide a shutdown sequence for shutting down only according to the request of the individual control device 9 side of the wind power generator 1, and the control load related to the logic for determining the sequence can be omitted on the central control device 20 side. In addition, in the event that the centralized control device 20 has a defect, it can still be shut down within the time required by each wind power generator 1.

The person who needs to shut down the centralized control device in the wind power plant may decide to stop based on the information collected in advance, but each wind power generator 1 can be judged and requested to be shut down by making it, so that the safety can be improved. The reason is that the individual safety functions of the wind turbine generator 1 are turned off. [Example 4]

As Embodiment 4, various modified examples of the present invention will be described below.

First, in the above-described embodiment, the individual control device 9 of the wind power generator 1 determines that the wind speed is exceeded, and sends the wind direction information and/or the stop request to the centralized control device 20. In this regard, the centralized control device 20 may also determine that the cut-out wind speed has exceeded. In this case, instead of sending a stop request, numerical information on the wind direction and wind speed is sent, and the central control device 20 compares it with a threshold. In this case, the wind direction and wind speed information indicates: measured numerical information (including averaged information), or judgment information on the result of comparing the numerical information with a threshold (cut out wind speed).

In addition, at this time, on the premise that sufficient information has been obtained from the individual control device 9 of the wind power generator 1, the calculation of the fatigue evaluation results and the order of creation of the waiting time can be performed on the side of the centralized control device 20.

When the centralized control device 20 determines that the cut-out wind speed has exceeded, the setting of the cut-out wind speed may be varied in order by the windmill in order to deviate the stop timing. In the case of setting the order according to the remaining life/degradation of the diagnosed windmill, the windmill with the longer remaining remaining life/lower degradation degree is set to have a lower cut-out wind speed.

FIG. 9 is a graph showing the combined output characteristics of a plurality of wind power generators of the wind power plant 100 in the case where the cut wind speed is different for each wind power generator as described above. When the wind speed V exceeds the stop wind speed V2 (cut-out wind speed), as the wind speed V rises, the wind power generators 1a, 1b, 1c, and 1d stop in the order specified based on the instruction of the centralized control device 20. When the wind speed V gradually rises, the windmills with low wind speeds are shut down in order. Therefore, it is possible to suppress the stopping of windmills that are concentrated at the same time or within a short period of time, thereby suppressing the change in the total output of the wind power plant.

1a, 1b, 1c, 1d

2‧‧‧blade

3‧‧‧Wheel

4‧‧‧Rotor

5‧‧‧Engine cabin

6‧‧‧Generator

7‧‧‧Pitch Angle Control Department

8‧‧‧ Tower

9a, 9b, 9c, 9d ‧‧‧ individual control device

10‧‧‧rotation speed detector

11‧‧‧ Anemometer

15‧‧‧Communication network

16‧‧‧Brake device

17‧‧‧stop command

20‧‧‧Centralized control device

30‧‧‧User

40‧‧‧In-plant transformer equipment

50‧‧‧Power system

90‧‧‧ transmission line

100‧‧‧Wind power plant

Pa, Pb, Pc, Pd‧‧‧Generation output

[Fig. 1] A diagram showing specific processing contents in the closing order determination process of the control unit 31 in Fig. 10.　　 [FIG. 2] A diagram showing a configuration example of a general wind power plant to which the present invention is applied.　　 [FIG. 3] A diagram showing representative configuration examples of the wind power generators 1a, 1b, 1c, and 1d.　　 [FIG. 4] A flowchart showing the processing contents of the individual control device 9 when the cut-out wind speed is reached.　　 [FIG. 5] A graph showing the output characteristics of the wind turbine generator 1 in the stand-alone unit of the wind turbine generator 1.　　 [FIG. 6] A graph showing the combined output characteristics of a plurality of wind power generation devices in the wind power plant 100. FIG. 7 is a graph showing the output change of the wind power plant 100 before and after the wind speed V exceeds the stop wind speed V2 (cut wind speed) when the present invention is not used. FIG. 8 is a graph showing the output change of the wind power plant 100 at the time T before and after the wind speed V exceeds the stop wind speed V2 (cut wind speed) advertised in the present invention. FIG. 9 is a graph showing the combined output characteristics of a plurality of wind power generators in the wind power plant 100 at the time of sequential stop of FIG. 8. FIG. 10 is a block diagram illustrating the configuration of the centralized control device 20 according to the present invention. FIG. 11 is a diagram briefly describing the coordinated operation of the individual control device 9 and the centralized control device 20 of the wind power generator 1. [FIG. 12] A block diagram showing the configuration of the centralized control device 20 according to Embodiment 2 of the present invention. FIG. 13 is a diagram briefly describing the coordinated operation of the individual control device 9 and the centralized control device 20 of the wind turbine generator 1 in the third embodiment. [FIG. 14] A flowchart of the centralized control device 20 in the first embodiment.

Claims (20)

A wind power plant having: a 　　 wind power generation device and a 　　 centralized control device, which controls a plurality of the aforementioned wind power generation devices; When the wind speed is cut or a shutdown request is issued, the number of wind power generators that reach or exceed the aforementioned wind power generation devices that simultaneously reach or exceed the cut wind speed or issue a shutdown request is controlled to proceed Stop licensing. The wind power plant according to claim 1, wherein the centralized control device is a sequence of wind power generation devices that reach or exceed the cut-out wind speed or issue a shutdown request at the same time or within a predetermined period, and the control is stopped based on the sequence of the sequence The aforementioned wind power generator. The wind power plant according to claim 1, wherein, after the wind power generation device reaches or exceeds the cut-out wind speed, the period before the control is sent to the central control device to send a stop permission or stop to the wind power generation device is limited at a predetermined ratio Power generation output. The wind power plant according to claim 2, wherein, after the wind power generation device reaches or exceeds the cut-out wind speed, the period before the control is sent to the central control device to send a stop permission or stop to the wind power generation device is limited at a predetermined ratio Power generation output. The wind power plant according to claim 2, wherein the aforementioned order is determined based on the wind direction and the configuration of the aforementioned wind power generator. The wind power plant according to any one of claims 1 to 5, wherein the centralized control device obtains wind speed information from the plurality of wind power generation devices, and based on the wind speed information, indicates stop. The wind power plant according to claim 6, wherein the centralized control device changes the shutdown request from the wind power generation device, and determines that there is a shutdown request based on the communication of the wind speed information. The wind power plant according to claim 2, wherein the 　　 wind power generator sets a scheduled stop time or delay time to communicate to the centralized control device, and the 　　 centralized control device sets the sequence based on the scheduled stop time or delay time. The wind power plant according to any one of claims 2 to 5, wherein the aforementioned centralized control device is a plurality of the aforementioned wind power generation devices that reach or exceed the cut-out wind speed or issue a shutdown request, a stop sequence list is prepared, and the management is completed from stop Deletion of the stop sequence list of the wind power generator, and addition and review of the stop sequence list of the wind power generator that reaches or exceeds the cut-out wind speed or newly generates a situation in which a shutdown request is issued. The wind power plant according to claim 6, wherein the aforementioned centralized control device is a plurality of the aforementioned wind power generation devices that reach or exceed the cut-out wind speed or issue a shutdown request, a stop sequence list is prepared, and the aforementioned stop of the wind power generation device from the completion of the stop is managed Deletion of the order list, and the order of addition and review of the stop order list of the wind power generator that reaches or exceeds the cut-out wind speed or newly generates a situation in which a shutdown request is issued. The wind power plant according to claim 7, wherein the aforementioned centralized control device is a plurality of the aforementioned wind power generation devices that reach or exceed the cut-out wind speed or issue a shutdown request, a stop sequence list is prepared, and the aforementioned stop of the wind power generation device from the completion of the stop is managed Deletion of the order list, and the order of addition and review of the stop order list of the wind power generator that reaches or exceeds the cut-out wind speed or newly generates a situation in which a shutdown request is issued. The wind power plant according to any one of claims 2 to 5, wherein the order in which the centralized control device is stopped is determined based on the remaining life or fatigue condition of the wind power generation device. The wind power plant according to claim 6, wherein the order in which the centralized control device is stopped is determined based on the remaining life or fatigue condition of the wind power generation device. The wind power plant according to claim 7, wherein the order in which the centralized control device is stopped is determined based on the remaining life or fatigue condition of the wind power generation device. The wind power plant according to claim 8, wherein the order in which the centralized control device is stopped is determined based on the remaining life or fatigue condition of the wind power generation device. A control method for a wind power plant, which includes a plurality of wind power generators, and at the same time or between a predetermined period of time, when two or more of the aforementioned wind power generators reach or exceed the cut-out wind speed or issue a shutdown request, stop The number of wind power generators is smaller than the number of wind power generators that reach or exceed the aforementioned wind speed cut-off or shutdown request at the same time or within a predetermined period. A wind power plant has a wind power generation device and a centralized control device. The wind power generation device includes: 　　 tower; 　　 engine room, which is rotatably provided on the aforementioned tower; 　　 rotor, which is rotatably provided at one end of the aforementioned engine room Drive generator; 　　 individual control device, which obtains the information of the surrounding wind speed, based on the wind speed information, to control the rotation of the rotor deceleration control; 　　 the centralized control device and the plurality of wind power generators respectively installed through the communication network The individual control device is connected; 　　 The individual control device sends a signal related to the request for the change of the operating state to the centralized control device when the wind speed becomes more than the predetermined cut-out wind speed. The centralized control device will At the same time or within a predetermined period of time, a plurality of requests for the change of the operating state received are sequenced, and based on the sequence, a signal to permit the change of the operating state is sent to the individual control device. The individual control device changes the aforesaid based on the permission signal. The operating state of the wind turbine. The wind power plant according to any one of claims 1 to 5, wherein the 　　 wind power plant sets a scheduled stop time or delay time, and the 　　 wind power plant does not control from the centralized control before the scheduled stop time or delay time passes When the device acquires a signal to permit the stop, the power generation stop operation is started. The wind power plant according to any one of claims 1 to 5, wherein the plurality of wind power generators set at least two or more different cut-out wind speeds. The wind power plant according to any one of claims 1 to 5, wherein the centralized control device is controlled such that after any one of the plurality of wind power generation devices starts to stop or after a predetermined period has elapsed Among the aforementioned wind power generators, other power generators start to stop.