JP5861152B2 - Power generation control device, power generation control method, and program - Google Patents

Description

  The present invention relates to a power generation control device, a power generation control method, and a program.

  For example, Patent Document 1 discloses a chopper circuit that increases or decreases a reactor current of a reactor supplied from a small wind power generator by a switching element that performs a switching operation according to a predetermined PWM drive signal, and the small wind power generation via the chopper circuit. A small wind power charging apparatus comprising: a power storage means for charging the output power of the machine; and a reactor current control means for generating and controlling the reactor current by generating the PWM drive signal, wherein the reactor current control means comprises: Based on the output characteristics obtained by measuring the output power of the small wind power generator and the rotational speed of the rotor under each wind speed in advance, the output power is brought close to the maximum power point at predetermined intervals based on the hill-climbing method. Maximum power point tracking control signal generating means for generating a maximum power point tracking control signal of the small wind power detected A reactor current command value generating means for generating a current command value of the reactor current by adding a proportional component signal proportional to the output voltage of the machine to the maximum power point tracking control signal, and the generated reactor current command value and detection And a drive signal generation means for generating the PWM drive signal based on the reactor current.

  Further, Patent Document 2 utilizes the fact that in a wind turbine that performs constant circumferential speed ratio operation without using an anemometer, the load characteristics are changed during operation, and the operation behavior of the system before and after that varies greatly. A wind turbine performance deterioration monitoring method is disclosed, wherein the system responsiveness is used as a monitoring index.

  As disclosed in the prior art documents, wind power generators have control characteristics unique to each power generator. Conventionally, wind tunnel experiments were conducted before operating the developed wind power generator, and It was necessary to investigate the control characteristics and design a power generation control device based on the control characteristics. However, since a dedicated power generation control device is installed for one wind power generator, the power generation control device is not versatile, and it is difficult to cope with the control characteristics of a wind power generator that has changed due to deterioration over time. There was a problem.

JP 2009-284570 A JP 2009-127598 A

  An object of the present invention is to provide a power generation control device, a power generation control method, and a program that detect control characteristics suitable for a power generation device.

  A power generation control device according to the present invention is measured by a power measurement unit that measures power generated by a generator, a load change unit that changes a load related to power generated by the generator, and the power measurement unit. Based on the result of comparison by the power comparison unit, the power comparison unit that compares the power before the load is changed by the load change unit with the power after the load is changed by the load change unit based on the power And a load determining unit that determines whether or not to change the load by the load changing unit.

  Preferably, the load determining unit instructs the load changing unit to restore the load change when the power comparing unit determines that the power has not increased, and the load changing unit Based on an instruction from the load determination unit, the load once changed is returned to before change.

  Preferably, the generator is a wind power generator, and further includes a fluctuation confirmation unit that confirms whether or not a fluctuation amount of the wind speed before and after the load change by the load changing unit is equal to or less than a predetermined value, The load determination unit causes the load change unit to confirm or return the change of the load before the change based on the confirmation result by the variation confirmation unit.

  Preferably, the apparatus further includes a voltage measuring unit that measures a voltage generated from the wind power generator, and the fluctuation confirmation unit is configured to change the load once by the load changing unit and when the load is temporarily changed and returned. The voltage measuring unit is caused to measure the voltage, and the variation of the measured voltage is confirmed, and the load determining unit is configured such that the variation amount of the voltage before and after the load change is equal to or less than a predetermined value by the variation confirming unit. The load change unit is instructed to confirm the change of the load, and when the fluctuation check unit determines that the voltage fluctuation amount before and after the load change exceeds a predetermined value, The load changing unit is instructed to return the load once changed before the change.

  Preferably, after changing the load by the load changing unit, based on the voltage measured by the voltage measuring unit, further includes a power generation stability determination unit that determines whether power generation by the generator is stable, The power comparison unit compares the power after the power generation stability determination unit determines that the power generation is stable, and the fluctuation confirmation unit determines that the power generation stability determination unit determines that the power generation is stable. Check the amount of wind speed fluctuation.

  Preferably, the power measurement unit further includes a power continuation determination unit that determines whether or not the power measured by the power measurement unit continuously decreases or increases during a predetermined time, and the load determination unit includes the power When the continuation determination unit determines that the power is continuously decreasing or increasing for a predetermined time, it determines whether or not to change the load.

  Preferably, the load is an input impedance of a converter, which is an electrical load, and a characteristic curve in which power is proportional to a constant nth power of a voltage (n is 2 to 4) or a current is a voltage (n-1). A calculation unit that calculates a proportional constant used for a characteristic curve proportional to the power; the calculation unit changes the calculated proportionality constant at a predetermined magnification; and the load changing unit is calculated by the calculation unit. The input impedance is changed based on the proportional constant.

  Preferably, the load changing unit sets an input impedance based on a proportional constant having the heaviest load calculated by the calculating unit as an initial value of the proportional constant.

  The power generation control method according to the present invention includes a step of measuring power generated by a generator, a step of changing a load related to power generated by the generator, and a load based on the measured power. Comparing the electric power before the change with the electric power after changing the load, and determining whether to change the load based on the comparison result.

  The program according to the present invention includes a step of measuring the power generated by the generator, a step of changing a load related to the power generated by the generator, and changing the load based on the measured power. The computer is caused to execute a step of comparing the previous power with the power after changing the load, and a step of determining whether to change the load based on the comparison result.

  ADVANTAGE OF THE INVENTION According to this invention, the control characteristic is detected while operating a generator, Based on the detected control characteristic, electric power extraction can be realized with high efficiency.

It is a graph showing the control characteristic curve calculated by the electric power generation control apparatus 1 which concerns on this embodiment. 2 is a schematic configuration diagram illustrating a state in which the power generation control device 1 according to the present embodiment is connected to a wind power generator 3. FIG. It is a flowchart explaining the change determination process (S10) of the proportionality constant by the electric power generation control apparatus 1 which concerns on this embodiment. It is a figure which illustrates functional composition of power generation control device 1 concerning this embodiment. It is a graph showing the voltage information measured by the electric power generation control apparatus 1 which concerns on this embodiment. It is a flowchart explaining the load increase / decrease determination process (S20) by the electric power generation control apparatus 1 which concerns on this embodiment. It is a graph showing the electric power information measured by the electric power generation control apparatus 1 which concerns on this embodiment, voltage information, and load change information. It is a graph showing the voltage-power characteristic curve measured by the electric power generation control apparatus 1 which concerns on this embodiment.

Hereinafter, the configuration of an embodiment of the present invention will be described with reference to the drawings. However, the scope of the present invention is not limited to the illustrated examples.
Moreover, a present Example demonstrates the case where a generator is a wind power generator.

  Conventionally, a power generation control device that efficiently extracts power even when the wind speed changes has been designed by building a circuit that extracts power proportional to the cube of the power generation voltage measured by a wind tunnel experiment or the like for each wind power generator. It was. For example, the power generation control device A can extract high power for a specific wind power generator even if the wind speed changes, but the power generation control device B can extract less power than the power generation control device A. This is because the power generation control device A is a power generation control device designed on the basis of the control characteristics of the wind power generator, so that the power of the wind power generator can be taken out with high efficiency. However, even when the power generation control device A is connected to another wind power generator, it cannot efficiently extract power and is not versatile. That is, conventionally, a power generation control device designed for each wind power generator is required, and a power generation control device designed for a specific wind power generator cannot efficiently extract power with other wind power generators. There was a problem of lack of versatility. Furthermore, the design of the power generation control device requires a wind tunnel experiment, so there is a problem that the development period is long and the development cost is high.

  Therefore, an object of the present invention is to detect the control characteristics of a generator while operating it, and to realize power extraction with high efficiency based on the detected control characteristics. In other words, the power generation control device 1 of the present invention automatically detects the control characteristics of the wind power generator while actually operating the wind power generator without conducting a wind tunnel experiment in advance. And the electric power generation control apparatus 1 enables taking out the electric power of a wind power generator with high efficiency by controlling the converter which exists in the inside of the electric power generation control apparatus 1 based on the detected control characteristic. Specifically, the power generation control device 1 of the present invention automatically switches the load related to the power generated by the wind power generator, detects the control characteristics of the wind power generator by detecting the load that can obtain high power, and inputs Control impedance. More specifically, the wind power generator has a characteristic of generating electric power proportional to the cube of the generated voltage, and the present invention provides a plurality of characteristic curves indicating this characteristic as illustrated in FIG. Among them, a characteristic curve capable of taking out the power of the wind power generator most efficiently is detected while monitoring the state of the generated voltage, current and power. Here, preparing a plurality of characteristic curves means preparing characteristic curves with different proportionality constants, that is, calculating proportionality constants by calculation and setting the calculated proportionality constant as the slope of the characteristic curve. is there. That is, in this example, the load is an input impedance that is an electrical load, and further corresponds to a proportional constant of the characteristic curve.

FIG. 2 is a schematic configuration diagram illustrating a state where the power generation control device 1 according to the present embodiment is connected to the wind power generator 3.
As illustrated in FIG. 2, the power generation control device 1 is connected to the wind power generator 3 and sends the power generated by the wind power generator 3 to the battery 5. A converter is present in the power generation control device 1.

FIG. 3 is a flowchart for explaining the proportional constant change confirmation process (S10) by the power generation control device 1.
In step 100 (S100), the power generation control device 1 confirms that it is in a steady state, that is, the wind speed is stable.
In step 105 (S105), the power generation control device 1 changes the proportionality constant of the characteristic curve.
In step 110 (S110), the power generation control device 1 compares the power generated by the wind power generator 3 before and after the change of the proportionality constant. When the power is increasing, the power generation control device 1 proceeds to the process of S115 (S115: Yes). When the electric power has not increased, the power generation control device 1 proceeds to the process of S105 (S105: No).
In step 115 (S115), the power generation control device 1 temporarily returns the proportionality constant to the state before the change (state of S100).
In step 120 (S120), the power generation control device 1 compares the power before the change of the proportionality constant in S100 with the power when the change of the proportionality constant is temporarily returned. When the generated power does not change significantly before the proportional constant change and after the proportional constant change is returned, the power generation control device 1 does not change the wind speed before the proportional constant change and after the proportional constant change is returned. That is, it is regarded that the wind speed is stable, and the process proceeds to S125 (S125: No). When the generated power has a large change before the proportional constant change and after the proportional constant change is returned, the power generation control device 1 changes the wind speed before the proportional constant change and after the proportional constant change is returned. That is, it is considered that the wind speed is not stable, the process proceeds to step 105, and the proportionality constant is changed (S105: Yes).
In step 125 (S125), the power generation control device 1 determines that the power has increased due to the proportional constant change while the wind speed is stable, and determines the change of the proportional constant. Specifically, the power generation control device 1 again changes the proportionality constant returned in S115 to the proportionality constant changed in S105.
By repeating the above processing, the power generation control device 1 changes the proportionality constant so that the generated power becomes large, and detects the proportionality constant of the characteristic curve that can obtain high power.

FIG. 4 is a diagram illustrating a functional configuration of the power generation control device 1 according to this embodiment.
As illustrated in FIG. 4, the power generation control device 1 according to the present embodiment includes a power measurement unit 10, a power comparison unit 15, a load determination unit 20, a load change unit 25, a power decrease determination unit 30, a voltage measurement unit 35, and a process. Unit 40, power generation stability determination unit 45, fluctuation confirmation unit 50, and calculation unit 55.

  The power measuring unit 10 measures the power generated by the wind power generator 3. Specifically, in the power measuring unit 10, the power measurement by the power measuring unit 10 is always performed and recorded.

  Based on the power measured by the power measuring unit 10, the power comparing unit 15 determines the power measured by the power measuring unit 10 and the load changing unit 25 ( After changing the load according to (described later), the power measured by the power measuring unit 10 is compared.

  The load determination unit 20 determines whether to change the load based on the result compared by the power comparison unit 15. Specifically, when it is determined by the power comparison unit 15 that the power has not increased, the load determination unit 20 instructs the load change unit 25 (described later) to restore the load change. Further, the load determination unit 20 causes the load changing unit 25 to confirm the change of the load or to return the change of the load before the change based on the confirmation result of the fluctuation amount of the wind speed of the fluctuation checking unit 50 (described later). More specifically, when it is determined by the fluctuation confirmation unit 50 (described later) that the voltage fluctuation amount before and after the load change is equal to or less than a predetermined value, the load judgment unit 20 When the change confirmation unit 50 (described later) determines that the amount of voltage fluctuation before and after the load change exceeds a predetermined value, the load change unit 25 changes the load once changed before the change is instructed. To return to.

  The load changing unit 25 changes the load related to the electric power generated by the wind power generator 3. Specifically, the load changing unit 25 changes the load based on the load change instruction notified by the load determining unit 20. More specifically, the load changing unit 25 causes the calculating unit 55 (described later) to calculate a proportional constant of the characteristic curve, and changes the input impedance of the converter based on the calculated proportional constant. Further, the load changing unit 25 sets the input impedance based on the proportional constant having the highest load calculated by the calculating unit 55 (described later) as the initial value of the proportional constant.

  The power continuation determination unit 30 determines whether or not the power measured by the power measurement unit 10 is continuously decreasing or increasing for a predetermined time. Specifically, the power continuation determination unit 30 causes the load determination unit 20 to change the load when the time during which the power measured by the power measurement unit 10 continues to increase or decrease reaches a predetermined time. Notify to determine whether or not. More specifically, the power continuation determination unit 30 has a counter, and adds 1 to the counter when the power comparison unit 15 determines that the power is decreasing. When the counter reaches 40, the power continuation determination unit 30 considers that the power decrease or increase continues for a long time, and the load determination unit 20 determines whether to change the load.

  The voltage measuring unit 35 measures the voltage generated by the wind power generator 3. The voltage measurement by the voltage measuring unit 35 is always performed and recorded.

  The processing unit 40 performs high frequency removal processing on the voltage measured by the voltage measuring unit 35 and records it as a filter voltage.

The power generation stability determination unit 45 determines whether the power generation disturbance immediately after the load change is stable. Specifically, after changing the load by the load changing unit 25, it is determined based on the voltage measured by the voltage measuring unit 35 whether or not the power generation by the wind power generator 3 is stable. As shown in the voltage information in FIG. 5, the determination method is such that when the voltage measured by the voltage measurement unit 35 and the filter voltage processed by the processing unit 40 match or the magnitude relationship is reversed, the power generation stability determination unit 45 determines that the power generation is stable. Furthermore, the power generation stability determination unit 45 causes the load determination unit 20 to determine whether or not to change the load when it is determined that the power generation is stable. That is, the power comparison unit 15 compares the power after the power generation stability determination unit 45 determines that the power generation is stable, and the fluctuation check unit 50 (described later) stabilizes the power generation by the power generation stability determination unit 45. After that, the fluctuation amount of the wind speed is confirmed.
In this example, the time when the power generation is stabilized is detected based on the voltage information. However, the voltage information may not be limited as long as it can be detected that the power generation is stable.

  The fluctuation confirmation unit 50 confirms whether or not the amount of fluctuation of the wind speed before and after the load change by the load changing unit 25 is equal to or less than a predetermined value. Specifically, the fluctuation confirmation unit 50 causes the voltage measurement unit 35 to measure the voltage before the load change by the load changing unit 25 and when the load is changed once and returned, and the amount of voltage fluctuation is Check if it is below the default value. More specifically, the fluctuation confirmation unit 50 uses, as the average voltage value, a voltage obtained by matching the measured voltage measured by the voltage measuring unit 35 with the filter voltage processed by the processing unit 40 or reversing the magnitude relationship. When a threshold value is set and the voltage measured by the voltage measuring unit 35 is included in this threshold value, it is determined that the amount of voltage fluctuation is equal to or less than a predetermined value, and the voltage measured in the threshold value is When not included, it is determined that the amount of voltage fluctuation exceeds a predetermined value.

The computing unit 55 computes a proportional constant used for a characteristic curve in which the power is proportional to the constant nth power of the voltage (n = 2 to 4) or a characteristic curve in which the current is proportional to the (n-1) th power of the voltage. Specifically, based on an instruction from the load changing unit 25, the calculation unit 55 changes the proportionality constant at a predetermined magnification, and calculates the proportionality constant of the characteristic curve. More specifically, the calculation unit 55 calculates the proportionality constant as 1.4 ^m . The initial value of the proportionality constant is 0, and then m increases from 1 to 1.

FIG. 5 is a graph showing voltage information measured by the power generation control device 1 according to the present embodiment.
A method for determining whether or not the fluctuation amount of the wind speed is equal to or less than the predetermined value by the fluctuation confirmation unit 50 will be described with reference to FIG.
As illustrated in FIG. 5, the voltage measurement unit 35 measures the voltage generated by the wind power generator 3 and records it as voltage information. The voltage measurement unit 35 records the measurement voltage and the filter voltage as voltage information. The fluctuation confirmation unit 50 sets α as a stable voltage after reducing the previous load, β as the stable voltage after reducing the load this time, and A as the difference β−α. If the fluctuation confirmation unit 50 uses α as a reference value and β is within ± A / 4 from the reference value, the voltage fluctuation amount is equal to or less than a predetermined value, that is, the wind speed is the same as before the load change. judge. In addition, when it is not within ± A / 4 from the reference value, the fluctuation confirmation unit 50 determines that the voltage fluctuation amount exceeds the predetermined value, that is, the wind speed has changed from before the load change, and the next reference value is It is not γ but the filter voltage δ when it is determined that the wind speed has changed.

FIG. 6 is a flowchart illustrating the load increase / decrease determination process (S20) by the power generation control device 1 according to the present embodiment.
The load increase / decrease determination process (S20) in the flowchart of FIG. 6 will be described assuming that the process of reducing the load is performed m times.
First, a process for reducing the load will be described.
In step 200 (S200), the power measurement unit 10 measures the power generated by the wind power generator 3, and the voltage measurement unit 35 measures the voltage generated by the wind power generator 3.
In step 205 (S205), the load determination unit 20 instructs the load change unit 25 to further reduce the load on the wind power generator 3. To reduce the load by one step is to calculate the case where the multiplier of the proportional constant is m + 1. Specifically, according to the instruction of the load changing unit 25, the calculating unit 55 is based on the proportional constant of the current characteristic curve. The proportional constant (1.4 ^{m + 1} ) is calculated, and the load changing unit 25 sets the proportional constant calculated by the calculating unit 55.

  In step 210 (S210), the power generation stability determination unit 45 determines whether or not the disturbance of the power generation voltage immediately after the load change is stable. Specifically, the power generation stability determination unit 45 determines whether power generation is stable based on the voltage information shown in FIG. When the power generation control device 1 determines that the power generation is stable, the power generation control device 1 proceeds to the process of step 215 (S215: Yes), and the power generation control device 1 repeats the process of step 210 until the power generation is stabilized.

  In step 215 (S215), the power comparison unit 15 determines whether or not the power has increased before and after the load change. Specifically, in S <b> 200, the power comparison unit 15 compares the power before the load change measured by the power measurement unit 10 with the current power measured by the power measurement unit 10. As a result of the comparison by the power comparison unit 15, when the power after the load change is larger than the power before the load change, the power generation control device 1 proceeds to the process of step 220 (S <b> 220: Yes). When the power after the load change is less than the power before the load change or when it does not change, the power generation control device 1 proceeds to the process of step 240 (S240: No).

In step 220 (S220), the load determining unit 20 instructs the load changing unit 25 to temporarily increase the load by one step. That is, in S220, the load changed in S205 is returned. To increase the weight one step is to calculate the case where the multiplier of the proportional constant is m + 1−1. Specifically, the load changing unit 25 changes the changed load in S205 to the state before S200 (the proportional constant is 1). Return to 4 ^m ).
In step 225 (S225), the power generation stability determination unit 45 determines whether or not the disturbance of the power generation voltage immediately after the load change is stable, as in S210. When the power generation control device 1 determines that the power generation is stable, the power generation control device 1 proceeds to the process of step S230 (S230: Yes), and the power generation control device 1 repeats the process of step 225 until the power generation is stabilized.

  In step 230 (S230), it is confirmed whether or not there is a change in the wind speed before the load is changed and after the load is changed and then the load is temporarily returned to the previous value. That is, in S230, it is confirmed that the cause of the increase in power is not due to a change in wind speed. Specifically, the fluctuation confirmation unit 50 confirms whether or not the fluctuation amount of the voltage is equal to or less than a predetermined value as compared with the voltage measured in S200 before the load change. When the voltage fluctuation amount is equal to or less than the predetermined value, that is, when there is no change in the wind speed, the power generation control device 1 proceeds to the process of step 235 (S235: Yes), and the voltage fluctuation amount exceeds the predetermined value. That is, when there is a change in the wind speed, the power generation control device 1 proceeds to the process of step 255 (S255: No).

In step 235 (S235), since it has been confirmed in S230 that the increase in power is not due to a change in wind speed but due to a change in load, the change in load is confirmed. Specifically, the load determining unit 20 instructs the load changing unit 25 to return the temporarily increased load. To return the heavier load, the calculation unit 55 calculates the case where the multiplier of the proportional constant is m + 1, and the load changing unit 25 sets the proportional constant calculated by the calculation unit 55 to set the same load as S205 ( The proportionality constant is 1.4 ^{m + 1} ).
The above is the process for reducing the load by one step.
In step 255 (S255), as in S235, the load determination unit 20 instructs the load changing unit 25 to return the load that has been temporarily increased.

Next, processing for increasing the load will be described.
Through steps S210 and S215, in step 240 (S240), the power continuation determination unit 30 determines whether or not the power measured by the power measurement unit 10 is continuously decreasing for a predetermined time.
In step 245 (S245), when the power continuation determination unit 30 determines that the power is continuously decreasing for a predetermined time, the power generation control device 1 proceeds to the process of step 250 (Yes: S250). Otherwise, the power generation control device 1 proceeds to the process of Step 210 (No: S210).
In step 250 (S250), the load determining unit 20 instructs the load changing unit 25 to increase the load by one level. Specifically, the calculation unit 55 calculates the case where the multiplier of the proportional constant is m + 1−1, and the load changing unit 25 sets the proportionality constant (1.4 ^m ) calculated by the calculation unit 55.
The above is the process for increasing the load one step.
By repeating the process of increasing the load and the process of reducing the load based on the increase / decrease in power, a control characteristic capable of stably and efficiently extracting power is detected.

  In this embodiment, when the power is decreasing in the flowchart of FIG. 6, the power continuation determination unit 30 measures the time during which the power continues to decrease. However, the present invention is not limited to this, and the power increases. In this case, the power continuation determination unit 30 may measure the time during which the power continues to increase, and temporarily increase the load when the increase time reaches a predetermined time.

FIG. 7 is a graph showing a selection state of power generation control characteristics by the power generation control device 1, a voltage measurement value, and a power measurement value. As shown in the selection of the power generation control characteristic in FIG. 7, while the increase in power is continuously detected, the characteristic is continuously selected in a direction in which the load becomes lighter. If it is not permitted and stable power generation is possible, the load will not be changed.
In light of the flowchart of FIG. 6, the processes performed in the order of S200, S205, S210, S215, S220, S225, S230, and S235 are processes until the one-stage load is reduced, and power is reduced by reducing the load. If this continues to increase, this process is repeated. In addition, the processes performed in the order of S200, S205, S210, S215, S240, S245, and S250 are processes until the one-stage load is increased. If no increase in power is observed even when the load is further reduced, the process of reducing the load by one level and the process of increasing the load by one level are repeated.
FIG. 8 shows a voltage-power characteristic curve. As shown in FIG. 8, the power generation control device 1 automatically switches the characteristic and selects a characteristic periphery that can finally obtain high power. Recognize.

  The power generation control device 1 sets the input impedance based on the proportional constant with the heaviest load as the initial value of the proportional constant. Specifically, in the case of the characteristic curve 0 shown in FIG. 8, that is, when the multiplier of the proportionality constant is 0, the characteristic curve is set with the heaviest load. For the next load change in which the heaviest load is set, the load determination unit 20 determines to reduce the load. In other words, the power generation control device 1 sets the initial load so that the process proceeds in the direction of reducing the load, thereby preventing the process from proceeding in a direction in which the generator is overloaded.

  As described above, the power generation control device 1 does not need to investigate the control characteristics of the wind power generator 3 in advance by a wind tunnel experiment or the like at the time of development. It is possible to automatically detect the electric power generated by the wind power generator 3 based on the detected control characteristics, and to take out with high efficiency. In other words, the power generation control device 1 can be developed regardless of the shape and size of the windmill even if it is connected to different wind power generators. The period can be shortened and the cost can be reduced. Further, the power generation control device 1 can detect a characteristic curve that efficiently extracts power according to the changed control characteristic even when the control characteristic of the wind power generator has changed due to aging or the like. .

In the present embodiment, the case has been described in which the calculating unit 55 calculates the proportionality constant based on the increase / decrease in the load determined by the load changing unit 25. However, the present invention is not limited to this. For example, the load calculating unit 55 The load changing unit 25 may change the load by selecting a value of this table by preparing a proportional constant calculated in advance as a table.
Further, in the present invention, the case where the generator is wind power generation has been described, but the present invention is not limited to this, and a generator that generates electricity by fluid energy by a turbine or the like, for example, a thermal power generator, a hydroelectric generator, a tidal power A generator may be used.

  As mentioned above, although embodiment which concerns on this invention was described, it is not limited to these, A various change, addition, etc. are possible within the range which does not deviate from the meaning of invention.

DESCRIPTION OF SYMBOLS 1 Power generation control apparatus 3 Wind generator 5 Battery 10 Electric power measurement part 15 Electric power comparison part 20 Load judgment part 25 Load change part 30 Electric power continuation determination part 35 Voltage measurement part 40 Processing part 45 Power generation stability determination part 50 Fluctuation confirmation part 55 Calculation part

Claims (10)

A power measuring unit for measuring the power generated by the generator;
As a load related to the power generated by the generator, a load changing unit that changes the input impedance of the converter ;
Based on the power measured by the power measuring unit, a power comparing unit that compares the power before changing the input impedance by the load changing unit and the power after changing the input impedance by the load changing unit,
A load determination unit that determines whether to confirm the change by the load change unit based on the result of comparison by the power comparison unit;
The load determination unit determines the change of the input impedance when the power increases due to the change of the input impedance, and returns the changed input impedance to the original when the power does not increase due to the change of the input impedance. > Power generation control device. The load determining unit, when the power comparing unit determines that the power has not increased, instructs the load changing unit to undo the change of the input impedance ,
The power generation control device according to claim 1, wherein the load changing unit returns the input impedance that has been changed once before the change based on an instruction from the load determining unit. The generator is a wind generator;
A fluctuation confirmation unit for confirming whether or not the fluctuation amount of the wind speed before and after the change of the input impedance by the load changing unit is equal to or less than a predetermined value;
The power generation control device according to claim 2, wherein the load determination unit causes the load changing unit to confirm or return the change of the input impedance before the change based on the confirmation result by the variation confirmation unit. A voltage measuring unit for measuring a voltage generated from the wind power generator;
The fluctuation confirmation unit causes the voltage measurement unit to measure a voltage before the input impedance is changed by the load changing unit and when the input impedance is once changed and returned, and confirms the fluctuation of the measured voltage. ,
The load determination unit, by the change confirmation portion, when the amount of change of the voltage before and after change of the input impedance is determined to be less than the default value, instructed to commit the changes of the input impedance to the load changer When the fluctuation confirmation unit determines that the amount of voltage fluctuation before and after the change of the input impedance exceeds a predetermined value, the load change unit is instructed to return the changed input impedance to the one before the change. The power generation control device described in 1. Voltage measuring unit for measuring a voltage generated from the wind power generator
Further comprising
A power generation stability determination unit that determines whether the power generation by the generator is stable based on the voltage measured by the voltage measurement unit after the input impedance is changed by the load change unit;
The power comparison unit compares the power after the power generation stability determination unit determines that the power generation is stable,
The power generation control device according to claim 3, wherein the fluctuation confirmation unit confirms a fluctuation amount of the wind speed after the power generation stability determination unit determines that the power generation is stable. A power continuation determination unit that determines whether or not the power measured by the power measurement unit continuously decreases or increases during a predetermined time;
The load determination unit determines whether or not to change the input impedance when the power continuation determination unit determines that the power is continuously decreasing or increasing for a predetermined time. The power generation control device described in 1. An arithmetic unit that calculates a proportional constant used for a characteristic curve in which power is proportional to a constant nth power (n is 2 to 4) or a characteristic curve in which current is proportional to the (n-1) th power of a voltage;
The calculation unit changes the calculated proportionality constant at a predetermined magnification,
The power generation control device according to claim 1, wherein the load changing unit changes an input impedance based on a proportionality constant calculated by the calculating unit. The power generation control device according to claim 7, wherein the load changing unit sets an input impedance based on a proportional constant having the heaviest load calculated by the calculating unit as an initial value of the proportional constant. Measuring the power generated by the generator;
Changing the input impedance of the converter as a load related to the power generated by the generator;
Based on the measured power, and comparing the previous power to change the input impedance, the power after changing the input impedance,
Based on the result of the comparison, when the power increases due to the change of the input impedance, the step of confirming the change of the input impedance;
And a step of restoring the changed input impedance when the power does not increase due to the change of the input impedance based on the comparison result . Measuring the power generated by the generator;
Changing the input impedance of the converter as a load related to the power generated by the generator;
Based on the measured power, and comparing the previous power to change the input impedance, the power after changing the input impedance,
Based on the result of the comparison, when the power increases due to the change of the input impedance, the step of confirming the change of the input impedance;
A program for causing a computer to execute the step of restoring the changed input impedance when the power does not increase due to the change of the input impedance based on the comparison result .

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