JP2011172457A - Power generation output controller, integrated power controller, power generation output control method, and integrated power control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To interconnect wind-power generation and photovoltaic power generation in large quantities inexpensively. <P>SOLUTION: A pitch angle control unit 16 of a wind-power generation apparatus 1 performs control to change a pitch angle of a blade 11 in accordance to a peripheral velocity ratio according to characteristic data shown in the figure. When generated power increases and there is not enough power margin to reduce the output systematically in a power system, the pitch angle is controlled to one offset from the optimal pitch angle to suppress an increase in generated power, thereby making a gradient of increase in generated power smaller and suppressing a rate of rise in generated power. When generated power is stable and there is not enough power margin to increase the output systematically in the power system, the pitch angle is shifted before the optimal pitch angle in preparation of a drop of generated power, thereby making small a difference between the power when generated power is stable and the power after the drop of generated power and suppressing a rate of drop in generated power. When a drop of generated power is predicted and there is not enough power margin to increase the output, the pitch angle may be offset from the optimal pitch angle. Conversely, when the drop in generated power is not predicted or there is enough power margin to increase the output, the wind-power generation apparatus is operated at the optimal operating point. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus and a method for controlling power output to a power system when a wind power generator or a solar power generator is connected to the power system.

  In wind power generation, in order to efficiently extract wind energy, the pitch angle of wind turbine blades (blades) is controlled (see Patent Document 1). In solar power generation, the power conditioner performs maximum power point tracking control (MPPT [Maximum Power Point Tracking] control) to follow the point where the output power of the solar cell is maximized (optimum operating point). (See Patent Document 2).

JP 2002-48050 A JP-A-7-281775

  By the way, when linking wind power generation or solar power generation to the power grid, the generated power tends to fluctuate greatly depending on the strength of the wind or sunlight. There are limitations. Therefore, it has been proposed to install a storage battery in order to increase the possible amount of interconnection. However, storage batteries are expensive and expensive to install, which may impede the introduction of wind and solar power generation.

  This invention is made | formed in view of the said subject, The main objective is to carry out grid connection of wind power generation and photovoltaic power generation cheaply and in large quantities.

  In order to solve the above-described problem, the present invention provides a power generation output control device that controls output power of a distributed power source connected to a power system, wherein an increase rate of the generated power of the distributed power source is greater than a predetermined value. And when the margin for lowering the power system is smaller than a predetermined value, the operating point of the distributed power source is shifted from the operating point at which the output power becomes maximum.

  According to this configuration, when the generated power rises and the power saving margin is insufficient, the output power to the power system is shifted from the maximum. Thereby, since the difference between the output power before the increase and the output power shifted from the maximum after the increase is small, the increase speed of the output power can be suppressed. According to this, the possible amount of interconnection of the distributed power source can be increased, and the distributed power source can be interconnected in a large amount at a low cost. Further, when the power system has sufficient margin for lowering, the output power remains at the maximum, so that the maximum output power can be maintained.

  Further, the present invention is a power generation output control device for controlling output power of a distributed power source connected to a power system, wherein the generated power of the distributed power source is stable and the power system has a margin for raising power. When it is smaller than a predetermined value, the operating point of the distributed power source is shifted from the operating point at which the output power becomes maximum.

  According to this configuration, when the generated power is stable and the surplus power of the power system is insufficient, the output power to the power system is shifted from the maximum. Thereby, when the generated power is reduced, the difference between the output power shifted from the maximum at the stable time and the output power after the reduction is reduced, so that the rate of reduction of the output power can be suppressed. According to this, the possible amount of interconnection of the distributed power source can be increased, and the distributed power source can be interconnected in a large amount at a low cost. In addition, when the power system has sufficient reserve capacity, the output power remains at the maximum, so that the maximum output power can be maintained during stable operation.

  Further, the present invention is a power generation output control device for controlling the output power of a distributed power source linked to a power system, wherein the generated power of the distributed power source is stable, and the power surplus margin of the power system is a predetermined value. When it is smaller and when it is predicted that the generated power will decrease, the operating point of the distributed power source is shifted from the operating point at which the output power becomes maximum.

  According to this configuration, the output power to the power system is shifted from the maximum when the generated power is stable and the surplus power of the power system is insufficient, and when the decrease in the generated power is predicted. Thereby, when the generated power is reduced, the difference between the output power shifted from the maximum at the stable time and the output power after the reduction is reduced, so that the rate of reduction of the output power can be suppressed. According to this, the possible amount of interconnection of the distributed power source can be increased, and the distributed power source can be interconnected in a large amount at a low cost. In addition, when the decrease in generated power is not predicted, or when the power system has sufficient reserve capacity, the output power remains at the maximum, so that the maximum output power can be maintained during stable operation. .

  In addition, the present invention is a general power control device that communicates with a plurality of generated power control devices that control output power of a distributed power source linked to a power system, and means for receiving output power from each generated power control device And means for summing up and storing each received output power, and calculating the fluctuation speed of the total output power, and when the calculated fluctuation speed exceeds a predetermined value, the generated power control apparatus related to the fluctuation And a means for transmitting a power fluctuation suppression command in preference to.

  According to this configuration, when the total output power increase rate exceeds a predetermined value, the suppression command is transmitted in preference to the generated power control device related to the output power increase, while the total output power When the decrease rate exceeds a predetermined value, the suppression command is transmitted with priority over the generated power control device related to the decrease in output power. According to this, by determining the total of the output power related to the plurality of generated power control devices, it is possible to suppress sudden output fluctuation as much as possible, and even if a fluctuation speed exceeding a predetermined value is detected, depending on the fluctuation situation Since the suppression command is transmitted to the selected generated power control device, the output fluctuation can be efficiently suppressed.

  The distributed power source in the claims corresponds to the wind power generator 1, the solar power generator 3, and the power conditioner 4 in the embodiment. The generated power control device in the claims corresponds to the pitch angle control unit 16 and the power conditioner 4 in the embodiment. The overall power control device in the claims corresponds to the overall control device 7 in the embodiment.

  The present invention includes a power generation output control method and a general power control method. In addition, the problems disclosed by the present application and the solutions thereof will be clarified by the description of the mode for carrying out the invention and the drawings.

  According to the present invention, wind power generation and solar power generation can be grid-connected at low cost and in large quantities.

It is a figure which shows the structure of the electric power generating apparatus which concerns on 1st Embodiment, (a) shows the structure of a wind power generator and its periphery, (b) shows the limit of the power adjustment capability in an electric power grid, (c ) Shows the configuration of the photovoltaic power generation apparatus and its surroundings. It is a figure which shows the example of a fluctuation | variation with time of generated electric power. It is a figure which shows the detail of the power generation output control method corresponding to electric power fluctuation | variation, (a) shows the control method of the wind power generator 1, (b) shows the control method of the power conditioner 4 connected to the solar power generation device 3. Show. It is a figure which shows the structure of the electric power generation output control system which concerns on 2nd Embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The power generation output control device according to the embodiment of the present invention, when performing control to maximize the output power to the power system based on the power generated by the power generation device such as wind power generation or solar power generation, When the fluctuation and the remaining capacity of the power system with respect to the output power satisfy a predetermined condition, control for shifting the operating point from the maximum point is performed. Regarding the remaining capacity of the power system relative to the output power, the load fluctuation amount of the entire system, which is the fluctuation of the load of the consumer and the fluctuation of the generated power by natural energy such as wind and solar power, is within the range of the adjustment capacity of the power system ( LFC [Load Frequency Control] control range (details will be described later).

  According to this, since the fluctuation speed of the output power can be suppressed by suppressing the output power after the fluctuation of the generated power or before the fluctuation, it is possible to increase the possible amount of the power generation apparatus that can be connected to the power system. Can do. In other words, if the generated power of the distributed power source suddenly increases or decreases, the power system side adjustment capability for the output power may not be provided, but by suppressing the fluctuation speed of the output power, It can be within the adjustment range on the system side.

<< First Embodiment >>
In the first embodiment according to the present invention, output control of a single power generator is individually performed. FIG. 1 is a diagram illustrating the configuration of the power generation device according to the first embodiment. Fig.1 (a) shows the structure of a wind power generator and its periphery. The wind power generator 1 is connected to the power system 2 and outputs the power generated by the wind power to the power system 2. The blade 11, the variable pitch 12, the rotor 13, the speed increaser 14, the generator 15, and the pitch angle are output. A control unit 16 is provided. The blade 11 is a blade of a windmill. The variable pitch 12 is a drive mechanism that connects the blade 11 and the rotor 13 and changes the direction of the blade 11, that is, the pitch angle. The rotor 13 supports the blade 11 via the variable pitch 12 and rotates when the blade 11 receives wind. The step-up gear 14 is between the rotor 13 and the generator 15, increases the rotational speed of the rotor 13, and transmits it to the generator 15. The generator 15 generates power by the rotation transmitted from the speed increaser 14.

  The pitch angle control unit 16 includes a microprocessor such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor) that is built in or externally connected to the wind turbine generator 1, and acquires output power of the generator 15. The variable pitch 12 is controlled so that the pitch angle of the blade 11 becomes appropriate. In normal times, control is performed so that the operating point becomes the optimum pitch angle at which the maximum efficiency point is obtained. However, the output power fluctuation speed (unit: [% / min], for example) and the remaining capacity of the power system 2 are controlled. In response, the pitch angle is slightly shifted from the optimum pitch angle to suppress the fluctuation speed. As an amount of shifting the pitch angle, for example, the angle corresponding to an output decrease of about several percent of the rated output of the wind turbine generator 1 is shifted.

  The electric power system 2 includes a power plant, a substation, a control station, a distribution line, and the like. The computer of the substation and the control station obtains the output power of the power plant, the output power of the wind power generator 1, the power consumption of the customer's load connected to the distribution line, etc. The lowering margin surplus power (details will be described later) is calculated, and information on the raising margin surplus power and the lowering margin surplus power is transmitted to the pitch angle control unit 16 of the wind turbine generator 1.

  FIG.1 (b) shows the structure of a solar power generation device and its periphery. The solar power generation device 3 is connected to the power system 5 through the power conditioner 4, and a power monitor 6 is provided between the power conditioner 4 and the power system 5. The solar power generation device 3 receives sunlight and generates power, and outputs the generated power to the power conditioner 4, and is realized by, for example, a solar battery. The power conditioner 4 includes a microprocessor such as a CPU and a DSP, and a storage device such as an HDD (Hard Disk Drive) and an SSD (Solid State Drive), and adjusts the power output to the power system 5. It receives the power generated from the power generation device 3 and controls it to operate at a point slightly deviated from the optimum operating point according to the fluctuation of the generated power and the remaining power of the power system 5, and the output voltage corresponding to the operating point Is converted to 100V and output to the power system 5. The operating point is adjusted according to the voltage / current characteristics of the photovoltaic power generator 3. The power monitor 6 monitors the power output from the power conditioner 4 to the power system 5.

  The power system 5 includes a power plant, a substation, a control station, a distribution line, and the like. The computer at the substation and the control station acquires the output power of the power plant, the output power of the photovoltaic power generation device 3, the power consumption of the customer's load connected to the distribution line, etc., and based on these, the surplus power of the power system is increased And the lowering margin surplus power (details will be described later) is calculated, and information on the raising margin and lowering margin surplus power is transmitted to the power conditioner 4.

  In addition, when the computer of the substation transmits information on the remaining power of the system to the wind power generator 1 or the power conditioner 4, for example, the master station (transfer cutoff signal transmission device) that interrupts transfer to the slave station (transfer cutoff device) A route (IP [Internet Protocol] network or the like) for transmitting a transfer cut-off signal is used.

  2 and 3 are diagrams showing details of the power generation output control method. FIG. 2A is a graph showing an example of temporal variation in generated power, where the horizontal axis represents time and the vertical axis represents generated power. The power generated by the wind power generator 1 or the solar power generator 3 fluctuates, for example, as rising → stable → falling. And with respect to the electric power fluctuation of the wind power generator 1, the pitch angle control part 16 with which the wind power generator 1 was equipped controls the pitch angle of the braid | blade 11, and the output from the wind power generator 1 to the electric power grid | system 2 is carried out. Adjust the power. That is, the generated power itself of the wind power generator 1 is adjusted. On the other hand, the power conditioner 4 connected to the solar power generation device 3 outputs the power fluctuation of the solar power generation device 3 to the power system 5 according to the generated power received from the solar power generation device 3. Adjust the power. Therefore, the generated power itself of the solar power generation device 3 is not adjusted. Details will be described later.

  FIG. 2B is a graph showing the limit of the power adjustment capability in the power system, with the horizontal axis representing time and the vertical axis representing generator output. LFC is a control that responds to power fluctuations (periods of several minutes to tens of minutes) and demand / supply mismatches that are difficult to predict demand. The LFC control range indicates the power fluctuation range that can be tolerated by the LFC. The range is about ± 5% of the machine output. Governor-free is control corresponding to power fluctuations (periods of several seconds to several minutes) that cannot be followed by LFC, for example, by absorption due to mechanical inertial force of a turbine or the like. EDC (Economic Load Dispatching Control) is control corresponding to a relatively long-time power fluctuation (a period of about ten minutes to several hours), and is controlled in advance in accordance with supply and demand prediction.

  And as the remaining capacity of the power system with respect to the power fluctuation received from the distributed power source, there is a surplus surplus capacity and a down surplus capacity. The surplus surplus power is the surplus power with respect to the drop in output power, and more specifically, the difference between the power generation output upper limit of a power plant that performs LFC control in the power system and the current power generation. The lowering margin surplus power is the surplus power with respect to the increase in output power, and more specifically, the difference between the lower limit of the generated power of the power plant that performs LFC control in the power system and the current generated power. Governor-free means the instantaneous power adjustment capability of the power plant connected to the power system due to boiler steam, turbine inertia, and the like. Therefore, if the fluctuation of the output power falls within the range of the surplus surplus power and the reduction surplus power, the output control is performed as it is, and if it does not fall within the range of the surplus power, it is necessary to suppress the fluctuation of the output power.

  In other words, it is necessary to perform output control as it is if the surplus surplus power and the lower surplus power are sufficient, and if the surplus power is not sufficient, it is necessary to suppress fluctuations in the output power. In other words, when the margin for reduction is insufficient, there is sufficient power system adjustment in the direction of output power drop, so the emphasis is placed on the control in the direction of output power increase, and the output power is controlled in order to suppress the drop speed. There is no control for lowering. On the other hand, when the surplus power is insufficient, there is sufficient power system adjustment in the direction of increasing output power. Therefore, control for suppressing the rate of increase is performed with emphasis on control in the direction of decreasing output power. Absent.

  Therefore, the electric power system 2 sequentially transmits information on the surplus surplus power and the surplus surplus power to the pitch angle control unit 16 of the wind turbine generator 1. In addition, the electric power system 5 sequentially transmits information on the surplus power and the surplus power to the power conditioner 4 connected to the solar power generation device 3. Information on the system reserve is acquired by constantly monitoring the operating state of the power plant and the power transmission state of the distribution line. For example, if the overall output power is moving at 80% of the upper limit value of the LFC control range, This means that there is a surplus margin of 20%. Further, if the entire output power is moving at 110% with respect to the lower limit value of the LFC control range, it means that there is a margin for reduction of 10%. On the other hand, the pitch angle control unit 16 and the power conditioner 4 control the output power to the power system based on the received information on the surplus power and the surplus power and the fluctuation of the generated power. The details will be described next.

  FIG. 3A shows a control method of the wind turbine generator 1 corresponding to the power fluctuation of FIG. 2A, and is a graph with the peripheral speed ratio as the horizontal axis and the pitch angle of the blade 11 as the vertical axis. . The curve drawn in the graph shows the relationship between the peripheral speed ratio of the blade 11 and the optimum pitch angle for obtaining the maximum output. The peripheral speed ratio is a ratio of the rotational speed [m / sec] of the outer peripheral portion of the blade to the wind speed [m / sec] hitting the blade, and is calculated by dividing the wind turbine blade tip speed by the wind speed. The pitch angle control unit 16 stores the characteristic data indicated by this curve, and normally performs control to adjust the pitch angle of the blade 11 to the optimum value according to the peripheral speed ratio according to the stored characteristic data. In addition, the following control is performed for the remaining power of the system.

(1) When the generated power rises and the margin for reduction is insufficient (when the increase in power is detected or predicted and the margin for reduction is insufficient)
When the rising speed of the generated power exceeds a predetermined value (for example, 5 [% / min]) and the reduction margin of the electric power system 2 is smaller than the predetermined value (for example, 20 [%]), it deviates from the optimum pitch angle. By increasing the pitch angle, the increase in generated power is suppressed as much as possible. Thereby, the inclination of the increase is reduced, and the increase rate of the generated power can be suppressed. “Pitch angle deviated from the optimum pitch angle” means a pitch angle obtained by multiplying a pitch angle obtained by subtracting a predetermined value or a predetermined ratio (<1) with respect to the optimum pitch angle corresponding to the peripheral speed ratio at that time. Say. Even if the lowering allowance is not sufficient, if the weather is not expected to increase and the generated power is not expected to increase, the operation at the optimum pitch angle is continued without shifting the pitch angle.
In order to detect an increase in electric power, the electric power is sequentially measured, and a gradient when the electric power starts increasing is detected. Then, the gradient is converted into an ascending speed, and the converted ascending speed is compared with a predetermined value.

(2) When the generated power is stable and the surplus power is insufficient The generated power is stable when the generated power is stable and the surplus power is smaller than a predetermined value (for example, 10 [%]). In preparation for the descent, move the pitch angle just before the optimum pitch angle. Thereby, the difference between the power at the time of stabilization and the power after the drop is reduced, and the slope at the time of the drop is reduced. Note that the pitch angle may be shifted from the optimum pitch angle when it is predicted that the generated power will drop and the reserve margin is smaller than a predetermined value. In other words, when a drop in generated power is not predicted or when the surplus power is greater than or equal to a predetermined value, the operation is performed as it is at the optimum operating point. According to this, the power loss at the time of stability can be reduced and the maximum output can be maintained.
In order to detect the stability of the power, the power is sequentially measured and it is detected that there is no increase or decrease.

(3) When the generated power is falling After the pitch angle is set to be close to the optimum pitch angle at the stable time, the generated power starts to drop, and the descending speed reaches a predetermined value (for example, -5 [% / min]). If lower, the pitch angle is returned to the optimum pitch angle. Thereby, the electric power after the descent can be increased, and the difference between the stable electric power and the electric power after the descent can be reduced, and as a result, the descent speed of the generated power can be suppressed.
To detect a drop in power, the power is measured sequentially and the slope when it starts to drop is detected. Then, the gradient is converted into a descending speed, and the converted descending speed is compared with a predetermined value.

  In addition, in order to predict the generated power of the wind power generator 1, there are methods of predicting the wind speed and direction from the data of weather information, or using past performance data, for example, power supply by wind power generation online. There is a wind power generation prediction tool AWPT (Advanced Wind Power Prediction Tool) that grasps the amount of electric power generated.

  FIG. 3B shows a control method of the power conditioner 4 connected to the photovoltaic power generation apparatus 3 corresponding to the power fluctuation of FIG. 2A, where the horizontal axis is the voltage V and the vertical axis is the current I. It is a graph. The curve drawn in the graph shows the VI output characteristics of the solar cell under a certain light source. A rectangular area surrounded by each broken line is output power.

In the optimum operating point P _A, and the voltage V _P, the balance of the current I _P well, the output power is maximized. The operating point of the voltage V _1, while the current is large, because the voltage is low, a small output power. The operating point of the voltage V _2, the voltage is high, because the current is small, a small output power. Incidentally, the open-circuit voltage is shown in _{V O,} the short-circuit current indicated by _{I S.}

  The power conditioner 4 stores the characteristic data indicated by this curve, and normally performs control so as to operate optimally according to sunlight in accordance with the stored characteristic data. Perform such control. It is assumed that the operating point moves on a characteristic data curve under a certain light source.

(1) When the generated power rises and the margin for reduction is insufficient (when the increase in power is detected or predicted and the margin for reduction is insufficient)
When the rising speed of the generated power exceeds a predetermined value (for example, 5 [% / min]) and the reduction margin is smaller than the predetermined value (for example, 20 [%]), the operating point deviates from the optimal operating point. By operating, the increase of output power is suppressed as much as possible. As a result, the output power after the increase is reduced and the inclination of the increase is reduced, so that the increase rate of the output power can be suppressed. “Operating at an operating point deviating from the optimal operating point” means outputting power obtained by multiplying power at the optimal operating point by a predetermined value or a predetermined ratio (<1), or The output of power corresponding to the operating point when the voltage or current at the optimal operating point is increased or decreased by a predetermined value. Even if the lowering allowance is not sufficient, if the weather is not expected and the generated power is not expected to rise, the operation at the optimum point is continued without shifting the operating point.
In order to detect an increase in generated power, the generated power is sequentially measured, and the gradient when it starts to increase is detected. Then, the gradient is converted into an ascending speed, and the converted ascending speed is compared with a predetermined value.

(2) When the generated power is stable and the surplus power is insufficient The generated power is stable when the generated power is stable and the surplus power is smaller than a predetermined value (for example, 10 [%]). In preparation for the descent, the operating point is deviated before the optimum operating point. Thereby, the difference between the output power at the time of stabilization and the output power after the drop is reduced, and the slope at the time of the drop is reduced. Note that the operating point may be shifted from the optimum operating point when it is predicted that the generated power will drop and the surplus margin is smaller than a predetermined value. In other words, when a drop in generated power is not predicted or when the surplus power is greater than or equal to a predetermined value, the operation is performed as it is at the optimum operating point. According to this, the power loss at the time of stability can be reduced and the maximum output can be maintained.
In order to detect the stability of the generated power, the generated power is measured sequentially and it is detected that there is no increase or decrease.

(3) When the generated power is decreasing After operating at the operating point before the optimum operating point at the stable time, the generated power starts to decrease and the decreasing speed is a predetermined value (for example, -5% / min) If the value is below, the operating point is returned to the optimum operating point. As a result, the output power after the drop can be increased, and the difference between the output power at the stable time and the output power after the drop can be reduced. According to this, the rate of decrease in output power can be suppressed.
In order to detect the drop in generated power, the generated power is sequentially measured, and the gradient when it starts to drop is detected. Then, the gradient is converted into a descending speed, and the converted descending speed is compared with a predetermined value.

  In order to predict the generated power of the solar power generation device 3, for example, there is a method of predicting the amount of solar radiation from the data of weather information and predicting the amount of power generation from the amount of solar radiation.

<< Second Embodiment >>
In the second embodiment according to the present invention, a control device connected to a plurality of power generation devices located in a certain area is comprehensively controlled. FIG. 4 is a diagram illustrating a configuration of the power generation output control system. The power generation output control system 10 makes it possible to suppress sudden output fluctuations by combining outputs of a plurality of power generation devices located in a limited area, and a plurality of wind power generation devices 1 (pitch angle control). Unit 16) and the plurality of power conditioners 4 and the overall control device 7 are communicably connected via the network 8. The overall control device 7 is realized by a PC (Personal Computer) or server including a communication unit (NIC [Network Interface Card], etc.), a processing unit (CPU), and a storage unit (HDD, SSD, etc.). The output power is received from each of the power conditioner 4 and a power fluctuation suppression command is sent to each wind power generator 1 and the power conditioner 4 according to the output power.

  Specifically, when the sum of output power of the wind power generator 1 in the area and the power conditioner 4 connected to the solar power generator 3 is calculated, and the power fluctuation speed based on the sum exceeds the specified value Transmits a power fluctuation suppression command to the wind turbine generator 1 and the power conditioner 4. In that case, a priority order is given with respect to each wind power generator 1 and the power conditioner 4, and the suppression command is sent. There are the following two ways of assigning priorities.

(1) By checking which state each device is in during the power increase, stable operation, and power decrease, the power in the necessary state is suppressed. For example, if the total value of power is increasing, the device in a state where power suppression is necessary means that the device whose output power is increasing is the target of suppression, that is, the cause of fluctuation. Suppress things. This is a method with a great suppression effect.
(If power increase suppression is required, select only the device whose power is increasing and send a suppression command.)
Specifically, a command to shift the operating point from the optimum point is issued to the device whose power is increasing. A command for returning the operating point to the optimum point is issued to the device whose power is dropping.
(2) The power is suppressed (cut) preferentially from the one with a small output power. This is a method that prioritizes costs (effectively uses the generated power), and those with low output power are based on the idea that they are not operating at the highest efficiency point because they are not exposed to sufficient wind and light. .

  In addition, you may combine both control of each power generator by the wind power generator 1 (pitch angle control part 16) and the power conditioner 4, and control of the whole area by the integrated control apparatus 10, or only control of the whole area. May be performed. In addition, the overall control device 10 performs finer control by exchanging information with the overall control device 10 that monitors and controls the power generation devices located in other areas and the power systems 2 and 5 that are connected to the power generation devices. You may make it perform. For example, when the overall control device 10 calculates the sum of the power generation outputs in a plurality of areas and the fluctuation speed of the sum output exceeds a predetermined value, power fluctuations are caused in a specific wind power generator 1 or power conditioner 4. It is conceivable to send a suppression command or send a power fluctuation suppression command to the wind power generator 1 or the power conditioner 4 when the power adjustment capabilities of the power systems 2 and 5 are insufficient.

  In the above-described embodiment, the CPU and the DSP execute the function of the pitch angle control unit 16 of the wind turbine generator 1 shown in FIG. 1A and the power conditioner 4 shown in FIG. The pitch angle control unit 16 and the power conditioner 4 according to the embodiment of the present invention are realized by recording the program to be recorded on a computer-readable recording medium, causing the computer to read and execute the recorded program. Shall be. In this case, the program may be provided to the computer via a network such as the Internet, or a semiconductor chip or the like in which the program is written may be incorporated in the computer.

  According to the embodiment of the present invention described above, when the generated power rises with respect to the wind power generation device 1 or the solar power generation device 3 and the power generation margin is insufficient, By shifting the output power from the maximum, the difference between the output power before the increase and the output power shifted from the maximum after the increase is reduced. Next, when the generated power is stable and the output power to the power system is shifted from the maximum when the power generation margin is insufficient, if the generated power is reduced, the generated power is shifted from the stable maximum. The difference between the output power and the output power after the decrease is reduced. And when the generated power is actually reduced, by returning the output power to the power system to the maximum, the difference between the output power shifted from the stable maximum and the output power returned to the maximum after the decrease is small. Become.

  According to the above, the possible amount of interconnection is increased by suppressing the slope at which the power output from the wind power generator 1 or the solar power generator 3 to the power system changes, that is, the fluctuation speed, without using a storage battery. Can do. According to this, the wind power generation device 1 and the solar power generation device 3 that are limited in the possible amount of interconnection can be grid-connected in a large amount at a low cost. Furthermore, the effect which accelerates | stimulates introduction of the wind power generator 1 and the solar power generation device 3 by this can be anticipated.

  As mentioned above, although the form for implementing this invention was demonstrated, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention. For example, in the above embodiment, the output control of a single distributed power source has been described as in the case of the wind power generator 1 or the solar power generator 3, but the above power generation output control method is applied to a large scale such as a wind farm or a mega solar. It is conceivable to apply it to a simple power generator. In the case of a large-scale power generator, the generated power can be predicted with high accuracy, so that the grid can be more effectively connected.

DESCRIPTION OF SYMBOLS 1 Wind power generator 2 Electric power system 3 Solar power generator 4 Power conditioner (power generation output control apparatus)
5 Power system 7 Overall control device (Overall power control device)
16 Pitch angle control unit (Power generation output control device)

Claims (8)

A power generation output control device for controlling the output power of a distributed power source linked to a power system,
When the increasing speed of the generated power of the distributed power source is larger than a predetermined value and the lowering margin of the power system is smaller than a predetermined value, the operating point of the distributed power source is the operating point at which the output power is maximum. Power generation output control device characterized by being shifted from A power generation output control device for controlling the output power of a distributed power source linked to a power system,
The operating point of the distributed power source is shifted from the operating point at which the output power is maximized when the generated power of the distributed power source is stable and the margin for raising the power system is smaller than a predetermined value. Power generation output control device. A power generation output control device for controlling the output power of a distributed power source linked to a power system,
When the generated power of the distributed power source is stable, the power reserve of the power system is smaller than a predetermined value, and when it is predicted that the generated power will decrease, the operating point of the distributed power source is output as the output power. A power generation output control device that is shifted from an operating point at which electric power becomes maximum. A general power control device that communicates with a plurality of generated power control devices that control output power of a distributed power source linked to a power system,
Means for receiving output power from each generated power control device;
Means for summing and storing each received output power;
Means for calculating the total fluctuation speed of the output power, and when the calculated fluctuation speed exceeds a predetermined value, transmitting a power fluctuation suppression command in preference to the generated power control apparatus related to the fluctuation;
A general power control apparatus comprising: A power generation output control method by a power generation output control device for controlling the output power of a distributed power source linked to a power system,
The power generation output control device includes:
When the increasing speed of the generated power of the distributed power source is larger than a predetermined value and the lowering margin of the power system is smaller than a predetermined value, the operating point of the distributed power source is the operating point at which the output power is maximum. A power generation output control method characterized by deviating from the above. A power generation output control method by a power generation output control device for controlling the output power of a distributed power source linked to a power system,
The power generation output control device includes:
The operating point of the distributed power source is shifted from the operating point at which the output power is maximized when the generated power of the distributed power source is stable and the margin for raising the power system is smaller than a predetermined value. Power generation output control method. A power generation output control method by a power generation output control device for controlling the output power of a distributed power source linked to a power system,
The power generation output control device includes:
When the generated power of the distributed power source is stable, the power reserve of the power system is smaller than a predetermined value, and when it is predicted that the generated power will decrease, the operating point of the distributed power source is output as the output power. A power generation output control method characterized by shifting from an operating point at which power is maximized. A general power control method by a general power control device that communicates with a plurality of generated power control devices that control output power of a distributed power source connected to a power system,
The overall power control device
Receiving output power from each generated power control device;
Summing and storing each received output power; and
Calculating the total fluctuation speed of the output power, and when the calculated fluctuation speed exceeds a predetermined value, transmitting a power fluctuation suppression command in preference to the generated power control apparatus related to the fluctuation;
The integrated power control method characterized by performing.