JP7075788B2 - Prediction detection method for sudden fluctuations in renewable energy power generation equipment, and renewable energy power generation systems - Google Patents

Description

The present invention relates to a predictive detection method for sudden fluctuations in a renewable energy power generation device in which the generated power suddenly changes due to an external factor , and a renewable energy power generation system .

Renewable energies such as solar power, hydropower, wind power, biomass, and geothermal energy are energies that emit almost no carbon dioxide. The introduction of such renewable energy is being promoted as a measure against the depletion of fossil fuels such as petroleum, coal and natural gas, and as a measure against global warming.

The electric power generated by renewable energy is introduced into the electric power system of the electric power company and effectively used. Until now, the introduction ratio of renewable energy was small, which was not a problem, but if the introduction ratio is large, the balance between supply and demand of electricity will change, so it will be necessary to maintain that balance. ..

If the renewable energy power generation device is a solar power generation device or a wind power generation device, the generated power varies depending on the weather conditions. If a large amount of fluctuating electric power is introduced into the electric power system, the frequency of the electric power system becomes unstable, and there is a concern that a problem may occur during power transmission.

Therefore, the electric power company is considering wide-area operation of electric power that requires each site of the renewable energy power generation device to limit the fluctuation range of the electric power output to the electric power system, limit the increase / decrease, and further limit the time zone. There is. In response to this, each site side of the renewable energy power generation device is considering the operation of mitigating the fluctuation of the generated power according to the required limit and outputting it to the power system.
Hereinafter, the electric power to be output to the electric power system is referred to as a system output electric power.

Photovoltaic power generation devices generate electricity in the daytime and are maximized during the hours when the sunlight is strongest. It does not generate electricity after the sun sets. Therefore, the generated power varies from 0 to the maximum in a day. In addition, the generated power fluctuates from several minutes to several tens of minutes due to changes in sunny and cloudy weather.
Wind power generators can generate electricity day and night if there is wind. However, as I have experienced, wind power has fluctuations that fluctuate in a few seconds and minutes, and fluctuates in a few hours, and the generated power fluctuates accordingly.

As described above, in the renewable energy power generation device, there are fluctuations in the generated power having different time intervals, and a system that alleviates the fluctuations is required.

As a method for this, there is a system in which a storage battery is provided and fluctuations are mitigated by charging and discharging the storage battery. However, when the fluctuation range and the fluctuation cycle are large, there is a problem that the storage battery becomes large and the system introduction cost rises.

To solve this problem, Patent Document 1 describes that in a photovoltaic power generation device and a wind power generation device, a water electrolytic tank device and a fuel cell are provided in addition to the storage battery to prevent the storage battery from becoming large in size.

In addition to mitigating fluctuations in the generated power by controlling the charge and discharge of the storage battery, if the storage ratio of the storage battery (hereinafter referred to as SOC) is large, power is supplied to the water electrolytic tank device rather than charging the storage battery. , Produces and stores hydrogen. On the other hand, when the SOC of the storage battery is small, the fuel cell is driven by using the stored hydrogen rather than being discharged from the storage battery to generate electricity and replenish the electric power. As described above, it is described that the energy stored in the storage battery is converted into hydrogen and stored in hydrogen to suppress the increase in size of the storage battery.
However, fuel cells have problems for practical use such as their own performance, durability, and cost reduction, and continuous development for practical use is underway.

In Patent Document 2, the generated power of the renewable energy power generation device is directly supplied to the water electrolyzer tank device, and the water oxygen gas is produced, stored, and the stored water oxygen gas is used to generate a fuel cell or an engine generator. It is described to drive and mitigate fluctuations.
Since the storage battery is not used, it is possible to prevent the system introduction cost from rising, but the water electrolytic cell device is less responsive than the storage battery and cannot mitigate fluctuations for several seconds.

Therefore, using a fluctuation mitigation system consisting of a storage battery, a water electrolyzer, and a power generation device that stores fuel gas such as hydrogen produced by the water electrolyzer and generates electricity using the stored fuel gas, from a few seconds. It is necessary to mitigate fluctuations in all generated power with different time intervals that take several hours.

In addition, a highly practical engine generator is required as a power generation device that generates electricity using the stored fuel gas.

Japanese Patent No. 4775790 Japanese Unexamined Patent Publication No. 2013-147735

To mitigate fluctuations in the generated power of renewable energy power generators that include one or more wind power generators, store storage batteries, water electrolyzers, and fuel gases such as hydrogen produced by the water electrolyzers. , A fluctuation mitigation system consisting of a power generation device that generates electricity using stored fuel gas is effective. In this fluctuation mitigation system, the control device sets the storage amount level of the storage battery and the storage amount level of the hydrogen storage body, and uses the storage amount level to charge / discharge the storage battery and start / stop the water electrolysis tank. It controls the start and stop of the engine generator.

According to the fluctuation mitigation system, renewable energy can be introduced into the power system while observing the fluctuation range limit, increase / decrease limit, and time zone limit for the system output power required by the electric power company.

Here, the inventors use the test record data of the renewable energy power generation device to control the storage battery, the hydroelectric electrolyzer, and the engine generator of the fluctuation mitigation system, the storage battery storage amount level, and the water electrolyzer tank device. The control method using the storage amount level of hydrogen produced in 1 and the fluctuation range of the grid output power as control parameters was verified. As a result, it was found that when the wind power generation device suddenly stops and restarts suddenly, there is a time zone that cannot be controlled due to the fluctuation range limit, increase / decrease permission limit, and time zone limit of the grid output power required by the electric power company.

Therefore, it is an object of the present invention to appropriately mitigate fluctuations in system output power even when a sudden stop and sudden restart of a renewable energy power generation device occurs.

In order to solve the above-mentioned problems, the method for predicting sudden fluctuations of the renewable energy power generator of the present invention is one or a plurality of renewable energy power generators that suddenly stop power generation when the flow velocity exceeds the first predetermined value. Renewable energy power generation device by a storage battery, a water electrolytic tank device, a storage body for storing hydrogen generated in the water electrolytic tank device, and a generator that generates power using the stored hydrogen. In order to mitigate the fluctuation of the power generated by the renewable energy generator, the step of measuring the storage amount of the storage battery and the storage amount of the hydrogen, and the storage amount of the storage battery in order to mitigate the fluctuation of the power generated by the renewable energy power generator. Accordingly, the step of controlling the charge / discharge of the storage battery and the operating power of the water electrolytic tank device and the power generated by the generator according to the stored amount of hydrogen, and the renewable energy power generation device. From the change over time of the generated power, the change over time of the measured value of the flow meter installed in the renewable energy power generator, or the change over time of the angle of the blade installed in the renewable energy power generator, the renewable energy power generator It is characterized in that a step of predicting a sudden stop and a step of increasing a threshold for determining the storage amount of the storage battery when the sudden stop of the renewable energy power generation device is foreseen are executed.

The renewable energy power generation system of the present invention includes a renewable energy power generation device that suddenly stops power generation when the flow velocity exceeds a first predetermined value, a storage battery, a water electrolytic tank device that generates hydrogen, and the water electrolytic tank device. The storage body that stores the generated hydrogen, the generator that generates power using the stored hydrogen, the storage amount of the storage battery and the storage amount of the hydrogen are measured, and the fluctuation of the generated power by the renewable energy power generation device is measured. In order to alleviate, the charge / discharge of the storage battery is controlled according to the storage amount of the storage battery, and the operating power of the water electrolytic tank apparatus and the power generation power of the generator are controlled according to the storage amount of hydrogen. , Changes over time in the power generated by the renewable energy power generator, changes over time in the measured values of the flowmeter installed in the renewable energy power generator, or changes in the angle of the blades installed in the renewable energy power generator. If the sudden stop of the renewable energy power generation device is foreseen from the above, it is characterized by comprising a control device that raises a threshold for determining the storage amount of the storage battery.
Other means will be described in the embodiment for carrying out the invention.

According to the present invention, even when a sudden stop and sudden restart of the renewable energy power generation device occurs, the fluctuation of the system output power can be appropriately mitigated.

It is a figure which shows the wind power generation system of this embodiment. It is a figure which shows the relationship between the threshold value of each storage amount of a wind power generation system, and the operation of each part. It is a flowchart which shows the control of the output power of a wind power generation system based on the setting of a power system. It is a graph which shows the characteristic in each wind power of a wind power generation system. It is a flowchart which detects the prediction of the sudden stop of a wind power generation device, and changes the threshold value of the storage battery storage amount. It is a flowchart which returns the threshold value of the changed storage battery storage amount to the original. It is a flowchart which detects the prediction of a sudden stop of a wind power generation device and maximizes the fluctuation range of a grid output power. It is a flowchart which sets the grid output power of a wind power generation system to 0. It is a flowchart which detects the sudden restart of a wind power generation device and changes the fluctuation range of a grid output power. It is a graph which shows an example of the control result of a wind power generation system.

The present invention will be described for a wind power generation device whose generated power varies depending on weather conditions, but the generated power of a renewable energy power generation device including a renewable energy power generation device having a sudden stop and a sudden restart like a wind power generation device. It can be applied to alleviate fluctuations in.

FIG. 1 is a diagram showing a wind power generation system S of the present embodiment.
The wind power generation system S includes wind power generation devices 1a to 1c, and controls the storage battery 3, the water electrolysis tank device 4, the hydrogen tank 5, and the engine generator 6 in order to mitigate fluctuations in the generated power P_in (t). A control device 7 for controlling is provided.

The wind power generation system S of the present embodiment includes three wind power generation devices (renewable energy power generation devices) 1a to 1c. However, the present invention is not limited to this, and the wind power generation system S may be provided with a single wind power generation device or an arbitrary number of wind power generation devices.

The wind power generation device (an example of a renewable energy power generation device) 1a to 1c are connected to the input side of the transformer 11 and connected to the power system via the transformer 11. Wings are installed in the wind power generators 1a to 1c.
The bus 14 on the output side of the transformer 11 is provided with a power meter 12 for measuring the generated power P_in (t) of the wind power generators 1a to 1c and a power meter 13 for measuring the system output power P_out (t). There is. The power meter 12 and the power meter 13 output the measured power information to the control device 7. These wind power generators 1a to 1c are provided with anemometers 15a to 15c (an example of a current meter), and are used for angle control of blades and predictive diagnosis of sudden stop and sudden restart.
When the wind power generation devices 1a to 1c are not particularly distinguished, they are simply described as the wind power generation device 1. When the anemometers 15a to 15c are not particularly distinguished, they are simply referred to as anemometers 15.

The wind power generator 1 rotates wings by wind power, and the rotational force rotates a generator to generate electricity. The generated power P_in (t) obtained by the wind power generation device 1 is alternating current. The transformer 11 adjusts the power generated by the wind power generation device 1 P_in (t) to a predetermined voltage and introduces it into the power system. The wind power generation device 1 suddenly stops power generation when the wind speed exceeds the first predetermined value, and suddenly restarts power generation when the wind speed becomes equal to or less than the first predetermined value when the power generation is suddenly stopped.
In the wind power generation device 1, the generated power P_in (t) fluctuates due to fluctuations in the wind power. Fluctuations in the generated power P_in (t) include short-term fluctuations that fluctuate from several seconds to several tens of seconds, medium-term fluctuations that fluctuate from several minutes to several tens of minutes, and long-term fluctuations that last for several hours.

Renewable energy power generation such as wind power generation is being promoted as a power generation technology for fossil fuel depletion prevention, global warming prevention, and environmentally friendly and clean energy generation. Due to the increase in the introduction of renewable energy power generation, output fluctuations may affect the maintenance of the frequency of the power system and affect the system users. Therefore, the operator of the power generation system must mitigate the fluctuation of the generated power P_in (t) to a level that does not affect the frequency adjustment.

The storage battery 3 is one of the means for mitigating fluctuations in the generated power P_in (t). The storage battery 3 is connected to the bus 14 on the output side of the transformer 11 via the storage battery PCS (power control system) 31. The storage battery storage amount meter 32 is a sensor that measures the storage amount C_bat (t) of the storage battery 3. The storage battery storage meter 32 outputs the measured storage amount C_bat (t) of the storage battery 3 to the control device 7.

The storage battery PCS31 is a device that converts alternating current and direct current and converts voltage. The control device 7 controls charging / discharging to the storage battery 3 at intervals of several seconds by the storage battery PCS 31 in order to mitigate the fluctuation of the generated power P_in (t) by the wind power generation device 1 in seconds. In order to mitigate fluctuations in the minute unit and the hour unit of the generated power P_in (t) by the wind power generation device 1, the storage battery 3 may have a large capacity. However, when the large-capacity storage battery 3 is introduced, there arises a problem that the cost for constructing the system rises.

The water electrolytic cell device 4 is one of the means for mitigating fluctuations in the generated power P_in (t). The water electrolytic cell device 4 is connected to the bus 14 via the transformer 41 and the AC / DC converter 42. The transformer 41 converts the AC voltage applied to the bus 14. The AC / DC converter 42 converts the alternating current output by the transformer 41 into direct current. The water electrolytic tank device 4 electrolyzes water with the DC power output by the AC / DC converter 42 to produce hydrogen and oxygen. The power meter 43 measures the operating power P_ele (t) of the water electrolytic cell device 4.

When the storage amount C_bat (t) of the storage battery 3 is large, the control device 7 introduces electric power into the water electrolytic cell device 4 to produce hydrogen and oxygen. The hydrogen produced by the water electrolytic cell apparatus 4 is stored in the hydrogen tank 5. Further, although not shown, the oxygen produced by the water electrolytic cell apparatus 4 may be released to the atmosphere, or may be stored and utilized in an oxygen tank (not shown).

The hydrogen tank 5 is a hydrogen storage body that stores the produced hydrogen and releases it when the hydrogen is used. The hydrogen storage amount meter 51 is a sensor that measures the storage amount C_H2 (t) of the hydrogen tank 5. The hydrogen stored in the hydrogen tank 5 may be bought and sold, but in the present invention, it is used as fuel for the engine generator 6.
The hydrogen storage body is not limited to a tank for storing hydrogen gas at high pressure, and may be a system for storing and releasing hydrogen gas using a hydrogen storage alloy or a methylcyclohexane (MCH) storage body.

The engine generator 6 generates AC power and introduces it to the bus 14. The power meter 62 measures the power generated by the engine generator 6 P_eng (t). The generated power P_eng (t) generated by the engine generator 6 is merged with the generated power P_in (t) generated by the wind power generator 1. As a result, the storage battery 3 can be charged and the system output power P_out (t) can be supplemented.

The engine generator 6 is a hydrogen co-firing engine generator that mixes hydrogen with gasoline or light oil, and generates AC power while producing an exhaust 61. Such gasoline-fueled ignition-type reciprocal engines and self-igniting diesel engines that use light oil or LPG (Liquefied Petroleum Gas) as fuel have been put into practical use and are widely used. A hydrogen co-firing engine that operates by adding hydrogen to these fuels is scheduled to be put into practical use as soon as possible.

Not limited to this, the engine generator 6 may be a hydrogen-only engine generator, a hydrogen-only gas turbine generator, or a hydrogen-mixed gas turbine generator that mixes hydrogen with LNG (Liquefied Natural Gas). It may be a fuel cell that generates electricity using hydrogen.

The hydrogen-only combustion engine has been developed for a long time, and there are some demonstration examples. However, the hydrogen-only combustion engine has a problem of embrittlement of the metal constituting the engine. The hydrogen-only combustion engine requires lean combustion in order to avoid inner fire caused by high combustion speed, and has the problem of low output, and further development for practical use is still underway. ing.

The efficiency of a gas turbine using hydrogen increases as the combustion temperature rises, but there is a problem that nitrogen oxides (NOx) are likely to be generated. Therefore, technological development of low NOx combustion is underway, and further development for practical use is still underway.

Since a fuel cell requires high-purity hydrogen, there is a problem that a system for purifying hydrogen is required. In addition, fuel cells have problems of durability and cost reduction, and further development for practical use is still underway.
In the present invention, a system control method applicable throughout the year was constructed using the 365-day test record data of the wind power generator 1.

The control device 7 takes in the measured values of the wattmeters 12 and 13, the storage battery storage wattmeter 32, the wattmeter 43, the hydrogen wattmeter 51, and the wattmeter 62. The control device 7 further sends a command to a control unit attached to each device of the storage battery 3, the water electrolytic cell device 4, and the engine generator 6. The control device 7 causes the storage battery 3 to be charged and discharged, and performs start control and stop control for the water electrolytic cell device 4 and the engine generator 6. The monitor 71 displays each measured value and control parameter captured by the control device 7.

FIG. 2 is a diagram showing the relationship between the threshold value of each storage amount of the wind power generation system S and the operation of each part.
In the present embodiment, the threshold value C_H2_H1 is provided as a level condition for the storage amount C_H2 (t) of the hydrogen tank 5. This threshold value C_H2_H1 is for securing a hydrogen storage amount C_H2 (t) capable of operating the engine generator 6 for an arbitrary time. If the stored amount C_H2 (t) of the hydrogen tank 5 is equal to or less than the threshold value C_H2_H1, the control device 7 suppresses the system output power P_out (t) to charge the generated power P_in (t) to the storage battery 3, and then charges the storage battery 3. The device 4 is started and controlled to generate hydrogen.

The wind power generation system S is provided with four types of threshold values C_bat_H2, C_bat_H1, C_bat_L2, and C_bat_L1 as level conditions for the storage amount C_bat (t) of the storage battery 3. When the storage amount C_bat (t) of the storage battery 3 exceeds the threshold value C_bat_H2, the water electrolytic cell device 4 is started. If the stored amount C_bat (t) of the storage battery 3 falls below the threshold value C_bat_L2 while the water electrolytic cell device 4 is operating, the water electrolytic cell device 4 is stopped. Since the storage amount C_bat (t) of the storage battery 3 operates between the threshold value C_bat_H2 and the threshold value C_bat_L2, the water electrolytic cell device 4 continuously operates for an arbitrary time, avoiding the intermittent operation of stopping immediately after the start-up. Can be driven.

When the storage amount C_bat (t) of the storage battery 3 decreases and falls below the threshold value C_bat_L1, the engine generator 6 is started. If the stored amount C_bat (t) of the storage battery 3 exceeds the threshold value C_bat_L2 while the engine generator 6 is operating, the engine generator 6 is stopped. Since the stored amount C_bat (t) of the storage battery 3 operates between the threshold value C_bat_L1 and the threshold value C_bat_L2, the engine generator 6 avoids intermittent operation of stopping immediately after starting, and is continuously operated for an arbitrary time. be able to.

At the threshold C_bat_L2 to the threshold C_bat_H1 in the intermediate range of the storage amount C_bat (t) of the storage battery 3, the fluctuation of the generated power P_in (t) was mitigated and mitigated only by the storage battery 3 without operating the engine generator 6. Controls the output of power.

Depending on the request from the electric power company, a limit may be imposed on the fluctuation range ΔP_c of the grid output power P_out (t). In this case, if the storage amount C_bat (t) of the storage battery 3 is in the range from the intermediate threshold value C_bat_L2 to the threshold value C_bat_H1, the control device 7 is within the limit of the fluctuation range ΔP_c according to the increase / decrease of the generated power P_in (t). Controls to increase or decrease the system output power P_out (t).
When the storage amount C_bat (t) of the storage battery 3 is equal to or higher than the threshold value C_bat_H1, the control device 7 controls to increase the system output power P_out (t) within the limit of the fluctuation range ΔP_c in order to suppress the charge to the storage battery 3. On the other hand, when the threshold value is C_bat_L1 or less, the control device 7 controls to reduce the system output power P_out (t) within the limit of the fluctuation range ΔP_c in order to promote the charging of the storage battery 3.

Up to this point, the case where the fluctuation range ΔP_c can be increased or decreased has been described. Setting 01 is such a case.
As a further request from the electric power company, each request of the following settings 02, 03, 04 may be imposed in the time zone. Setting 02 is a case where an increase in the grid output power P_out (t) is allowed, but a decrease is prohibited. Controls such as setting 02 are useful during times of increasing power grid demand, such as in the morning. Setting 03 is a case where the increase / decrease of the grid output power P_out (t) is prohibited and is constant. Control such as setting 03 is necessary, for example, during the time when the demand for the power system in the daytime continues to be high. Setting 04 is a case where a decrease in the grid output power P_out (t) is allowed, but an increase is prohibited. Controls such as setting 04 are necessary during times of low demand for the power system, such as at night.

FIG. 3 is a flowchart showing the control of the grid output power P_out (t) of the wind power generation system S based on the setting of the electric power company.
Here, a method of setting the system output power P_out (t) at the threshold value C_bat_H1 from the threshold value C_bat_L2 in the intermediate range of the storage amount C_bat (t) of the storage battery 3 is shown.
When the control device 7 measures the generated power P_in (t) (step S10), acquires the fluctuation range ΔP_c of the system output power P_out (t) (step S11), and measures the system output power P_out (t-Δt). (Step S12), the process proceeds to step S13 to perform multiple branching according to the setting mode.

In step S13, the control device 7 proceeds to the process of step S14 if the setting is 01, proceeds to the process of step S15 if the setting is 02, proceeds to the process of step S16 if the setting is 03, and proceeds to the process of step S17 if the setting is 04. Proceed to.

Setting 01 is a mode in which the grid output power P_out (t) is allowed to increase or decrease by the electric power company. In step S14, when the difference between the generated power P_in (t) at the current time t and the system output power P_out (t-Δt) at the previous time (t-Δt) is zero or negative, the control device 7 The grid output power P_out (t) at time t is set by subtracting the fluctuation width ΔP_c from the grid output power P_out (t-Δt).

Further, in step S14, when the difference between the generated power P_in (t) at the current time t and the system output power P_out (t-Δt) at the previous time (t-Δt) is positive, the control device 7 sets the time. The grid output power P_out (t) at t is set by adding the fluctuation width ΔP_c to the grid output power P_out (t-Δt). After the process of step S14, the control device 7 proceeds to the process of step S18.

That is, if the system output power P_out (t-Δt) is smaller than the generated power P_in (t), the control device 7 reduces the system output power P_out (t) and the system output power is smaller than the generated power P_in (t). If P_out (t-Δt) is large, control is performed to increase the system output power P_out (t). Here, the fluctuation width ΔP_c is a constant equal to or less than the allowable fluctuation width with respect to the grid output power P_out (t) required by the electric power company.

Setting 02 is a mode in which the power company allows fluctuations in the grid output power P_out (t) in the increasing direction, but prohibits fluctuations in the decreasing direction. In step S15, when the difference between the generated power P_in (t) at the current time t and the system output power P_out (t-Δt) at the previous time (t-Δt) is zero or negative, the control device 7 The grid output power P_out (t) at time t is set to be the same as the grid output power P_out (t-Δt).

Further, in step S15, when the difference between the generated power P_in (t) at the current time t and the system output power P_out (t-Δt) at the previous time (t-Δt) is positive, the control device 7 sets the time. The grid output power P_out (t) at t is set by adding the fluctuation width ΔP_c to the grid output power P_out (t-Δt). After the process of step S15, the control device 7 proceeds to the process of step S18.

That is, if the system output power P_out (t-Δt) is smaller than the generated power P_in (t), the control device 7 does not change the system output power P_out (t) and outputs the system more than the generated power P_in (t). If the power P_out (t-Δt) is large, control is performed to increase the system output power P_out (t).

Setting 03 is a mode in a time zone in which the increase / decrease of the grid output power P_out (t) is prohibited by the electric power company and is set to be constant. In step S16, when the difference between the generated power P_in (t) at the current time t and the system output power P_out (t-Δt) at the previous time (t-Δt) is zero or negative, the control device 7 The grid output power P_out (t) at time t is set to be the same as the grid output power P_out (t-Δt).

Further, in step S16, when the difference between the generated power P_in (t) at the current time t and the system output power P_out (t-Δt) at the previous time (t-Δt) is positive, the control device 7 sets the time. The grid output power P_out (t) at t is set to be the same as the grid output power P_out (t-Δt). After the process of step S16, the control device 7 proceeds to the process of step S18.
That is, the control device 7 does not change the system output power P_out (t) regardless of the magnitude relationship between the generated power P_in (t) and the system output power P_out (t-Δt).

Setting 04 is a mode in which the fluctuation of the grid output power P_out (t) in the increasing direction is prohibited by the electric power company, but the fluctuation in the decreasing direction is allowed. In step S17, when the difference between the generated power P_in (t) at the current time t and the system output power P_out (t-Δt) at the previous time (t-Δt) is zero or negative, the control device 7 The grid output power P_out (t) at time t is set by subtracting the fluctuation width ΔP_c from the grid output power P_out (t-Δt).
Further, in step S17, when the difference between the generated power P_in (t) at the current time t and the system output power P_out (t-Δt) at the previous time (t-Δt) is positive, the control device 7 sets the time. The grid output power P_out (t) at t is set to be the same as the grid output power P_out (t-Δt). After the process of step S17, the control device 7 proceeds to the process of step S18.

That is, if the system output power P_out (t-Δt) is smaller than the generated power P_in (t), the control device 7 reduces the system output power P_out (t) and the system output power is smaller than the generated power P_in (t). If P_out (t-Δt) is large, control is performed to increase the system output power P_out (t). Here, the fluctuation width ΔP_c is a constant equal to or less than the allowable fluctuation width with respect to the grid output power P_out (t) required by the electric power company.

In step S18, the control device 7 continuously controls by updating the time t by the time interval Δt and returning to step S10 via the node S.

FIG. 4 is a graph showing the characteristics of the wind power generation device 1 at each wind speed.
The upper part is a graph showing the relationship between the wind speed and the generated power P_in (t). The lower part is the relationship between the wind speed and the wing angle W. The wing referred to here is a wing (wing) that is installed in a rotor or the like of a wind power generator 1 and converts wind power into rotational force. The control unit (not shown) of the wind power generation device 1 controls the blade angle W based on the information of the wind speed S obtained by the anemometer 15.

The wind speed less than S0 is the region M1. Since the wind speed is too small in the region M1, the wind turbine does not rotate and the generated power P_in (t) is 0. In the region M1, the blade angle W is a predetermined value θ that is susceptible to wind power.
A wind speed S0 or more and a wind speed less than S1 is the region M2. In the region M2, the wind turbine starts to rotate, and the generated power P_in (t) increases exponentially as the wind speed increases. In the region M2, the blade angle W has a predetermined value θ that is easily received by wind power.

The wind speed S1 or more and less than the wind speed S2 is the region M3. In the region M3, the blade angle W is changed each time the wind speed increases to release a part of the wind power, and the generated power P_in (t) is kept constant.
The wind speed S2 or higher is the region M4. In the region M4, the blade angle W is set to 0 °, all the wind power is released, and the power generation is suddenly stopped. After that, when the wind weakens, the wind power generation device 1 suddenly restarts power generation.

As a result of controlling the fluctuation mitigation system of the generated power using the 365-day test record data of the wind power generation device 1, there is a time zone that cannot be controlled, and the wind power generation device 1 suddenly stops and restarts before and after that time zone. It turned out that there was.

Therefore, the inventors have added the prediction of a sudden stop, the detection of a stop, and the detection of a sudden restart of the wind power generation device 1 to the power generation system including the wind power generation device 1 or the renewable energy power generation device including the wind power generation device 1. Introduced the control.

FIG. 5 is a flowchart for detecting the prediction of a sudden stop of the wind power generation device 1 and changing the threshold value of the storage amount C_bat (t) of the storage battery 3.
Immediately before the wind power generation device 1 suddenly stops, it is in the state of the region M3 in FIG. 4, and the predictive diagnosis of the sudden stop is detected in the state of the region M3.

The control device 7 is preset with threshold values C_bat_H2, C_bat_H1, C_bat_L2, and C_bat_L1 for the storage amount C_bat (t) of the four types of storage batteries 3 in the normal state (step S20). Further, in order to predict and diagnose the sudden stop of the wind power generation device 1, the reference power P_s and the duration reference S_c_time, which is the minimum duration to exceed the value, are set in advance in the control device 7 ( Step S21). Further, the control device 7 sets the initial value 0 in the prediction determination time S_time (step S22), and measures the generated power P_in (t) (step S23).

In step S24, the control device 7 determines whether or not the generated power P_in (t) is larger than the reference power P_s. If the generated power P_in (t) is larger than the reference power P_s (Yes), the control device 7 updates the prediction judgment time S_time by the time interval Δt (step S25), and the prediction judgment time S_time is larger than the duration reference S_c_time. It is determined whether or not it has become (step S26). When the determination in step S24 is established (Yes), the wind speed S is any of the regions M3 in FIG. The generated power P_in (t) of the wind power generation device 1 fluctuates greatly up and down according to the change of the wind power. Therefore, by the determination in step S24, it is determined that the lower limit of the fluctuation is larger than the reference power P_s, and therefore the prediction is determined.

If the predictive determination time S_time becomes larger than the duration reference S_c_time (Yes), the control device 7 predictively diagnoses the sudden stop and proceeds to step S27. In step S27, the control device 7 raises the level condition of the storage amount C_bat (t) of the four types of storage batteries 3 to change to the threshold values C_bat_H2a, C_bat_H1a, C_bat_L2a, C_bat_L1a, and proceeds to step S30 of FIG. As a result, the control device 7 can secure a large storage amount C_bat (t) of the storage battery 3 in order to prepare for the sudden stop of the wind power generation device 1.
On the other hand, in step S26, if the prediction determination time S_time is equal to or less than the duration reference S_c_time (No), when the time t is updated by the time interval Δt (step S29), the control device 7 returns to the process of step S23.

In step S24, if the generated power P_in (t) is equal to or less than the reference power P_s (No), the control device 7 indicates that the wind power has weakened and moved to the region M2 or region M1 of FIG. At this time, when the predictive determination time S_time is initialized to 0 (step S28) and the time t is updated by the time interval Δt (step S29), the control device 7 returns to the process of step S23.

Each threshold value of the storage amount C_bat (t) of the storage battery 3 changed by the control device 7 in step S27 was set to be larger than each threshold value in the normal state. This is to deal with the case where the grid output power P_out (t) after the fluctuation is mitigated is subject to a limit on whether or not it can be increased or decreased and a time zone limit. For example, if the wind power generation device 1 suddenly stops during a time period during which the grid output power P_out (t) cannot be reduced, the storage battery 3 must be discharged to supplement the grid output power P_out (t). The engine generator 6 starts when the storage amount C_bat (t) of the storage battery 3 becomes low, but when the power generated by the engine generator 6 P_eng (t) is smaller than the system output power P_out (t), the engine generator 6 The storage battery 3 is also discharged at the same time as the operation. Therefore, the storage amount C_bat (t) of the storage battery 3 is controlled to be increased before the sudden stop so that the storage amount C_bat (t) of the storage battery 3 does not become empty (0).

In this embodiment, since the generated power P_in (t) is used as the test result data of the wind power generation device 1, a sudden stop is predicted by using two set values of the reference power P_s and the duration reference S_c_time.
The wind power generation device 1 has the characteristics shown in the graph of FIG. If there is wind speed data here, the reference power P_s can be changed to the reference wind speed S_s and the same control can be performed. Further, in the region M3 of FIG. 4, since the operation is performed by changing the blade angle to keep the generated power P_in (t) constant, the same is true even if the reference power P_s is changed to the blade angle W if there is data on the blade angle W. You can control it.

The change in the level condition of the storage amount C_bat (t) of the storage battery 3 is a temporary change when the wind power generation device 1 suddenly stops, and it is usually better to control it under the original level condition. Therefore, it is necessary to return to the original level condition.

FIG. 6 is a flowchart for restoring the changed threshold value of the storage amount C_bat (t) of the storage battery 3.
Upon receiving the node A in FIG. 5, the reference power P_u is set in the control device 7 as a condition for the release diagnosis (step S30). This reference power P_u is smaller than the reference power P_s under the condition for predicting and diagnosing a sudden stop. The control device 7 measures the generated power P_in (t) (step S31), and determines whether or not the generated power P_in (t) is smaller than the reference power P_u (step S32).

In step S32, if the generated power P_in (t) becomes smaller than the reference power P_u (Yes), the control device 7 returns to step S20 of FIG. 5 via the node B, and the storage amount C_bat of the storage battery 3 Restore the threshold of (t).
On the other hand, in step S32, if the generated power P_in (t) is equal to or higher than the reference power P_u (No), the control device 7 updates the time t by the time interval Δt (step S33) and returns to step S31.

FIG. 7 is a flowchart that detects the prediction of a sudden stop of the wind power generation device 1 and maximizes the fluctuation range ΔP_c of the system output power P_out (t).

The purpose of this embodiment is to detect a behavior in which the wind speed S is large and the device is suddenly stopped for safety protection. Therefore, the control device 7 may detect a sudden stop by combining the data of the wind speed S or the data of the blade angle W and the data of the generated power P_in (t). However, if there is neither the wind speed S data nor the blade angle W data, it must be detected only by the generated power P_in (t) data.

In the control device 7, a standard fluctuation width ΔP_c_u is set as the fluctuation width ΔP_c of the system output power P_out (t) (step S40), and a duration reference Z_c_time which is a sudden stop detection condition is set (step S41). ). The control device 7 initializes the sudden stop determination time Z_time to 0 (step S42), and measures the generated power P_in (t) (step S43).

In step S44, the control device 7 determines whether or not the measured generated power P_in (t) is equal to or less than the reference power P_eps. When the number of wind power generation devices 1 is small, the control device 7 may determine whether or not the generated power P_in (t) is 0. However, when the number of wind power generation devices 1 is several tens, some wind power generation devices 1 may continue to generate power even if the majority of the wind power generation devices 1 suddenly stop. In order to determine such a case as a sudden stop, the control device 7 compares the generated power P_in (t) with the reference power P_eps. Here, the reference power P_eps is power that some wind power generation devices 1 continue to generate power, but it is expected that some of these wind power generation devices 1 will also suddenly stop as the wind power increases.

In step S44, if the generated power P_in (t) is equal to or less than the reference power P_eps (Yes), the sudden stop determination time Z_time is updated by the time interval Δt (step S45), and the sudden stop determination time Z_time continues. It is determined whether or not it is larger than the time reference Z_c_time (step S46). If the sudden stop determination time Z_time becomes larger than the duration reference Z_c_time (Yes), the control device 7 determines that the sudden stop is sudden and sets the maximum fluctuation width ΔP_c_max in the fluctuation width ΔP_c (step S47). .. After step S47, the control device 7 proceeds to the process of step S50 in FIG.

On the other hand, in step S46, if the sudden stop determination time Z_time is equal to or less than the duration reference Z_c_time (No), when the time t is updated by the time interval Δt (step S49), the control device 7 returns to the process of step S43.
In step S44, if the generated power P_in (t) exceeds the reference power P_eps (No), the control device 7 initializes the sudden stop determination time Z_time to 0 (step S48) and sets the time t. When the time interval Δt is updated (step S49), the process returns to the process of step S43.

In the wind power generation device 1, the generated power P_in (t) may temporarily become 0 due to the temporary stop of the wind. In order to exclude such a case from the sudden stop, the control device 7 detects the sudden stop when the state where the generated power P_in (t) is equal to or less than the reference power P_eps continues for a longer time than the duration reference Z_c_time. did.

If the number of wind power generation devices 1 is large, most of the wind power generation devices 1 may be suddenly stopped and some of the wind power generation devices 1 may be operating. In such a case, the total generated power P_in (t) drops sharply, but does not reach zero. The control device 7 of the present embodiment can detect that most of the wind power generation devices 1 have suddenly stopped by comparing the generated power P_in (t) with the reference power P_eps.

The control device 7 detects that the measured generated power P_in (t) is equal to or less than the reference power P_eps indicating a sudden decrease, and when the continuous detection time becomes larger than the duration reference Z_c_time, the system output power P_out (t). ) Is reduced by the maximum fluctuation range ΔP_c_max within the limit range, and the system output power P_out (t) is immediately controlled to be the generated power P_in (t) indicating a sudden decrease. By this control, the decrease of the storage amount C_bat (t) of the storage battery 3 can be suppressed.
The increase in the grid output power P_out (t) is not limited to the maximum fluctuation width ΔP_c_max within the limit range, but is an arbitrary value between the maximum fluctuation width ΔP_c_max within the limit range and the default fluctuation width ΔP_c_u. You may.

FIG. 8 is a flowchart in which the grid output power P_out (t) of the wind power generation system S is set to 0.
Upon receiving the node D in FIG. 7, the control device 7 measures the system output power P_out (t-Δt) at the time (t-Δt) (step S50). The control device 7 determines whether or not the system output power P_out (t-Δt) exceeds the reference power P_eps (step S51). If the system output power P_out (t-Δt) exceeds the reference power P_eps (Yes), the control device 7 determines whether or not the setting 01 or the setting 04 allows the reduction of the fluctuation width ΔP_c. (Step S52).

In step S52, if setting 01 or setting 04 (Yes), the control device 7 subtracts the system output power P_out (t) at time t and the fluctuation width ΔP_c from the previous system output power P_out (t-Δt). As a value (step S53), the time t is updated by the time interval Δt (step S54), and the time t is returned to step S50.

On the other hand, in step S52, if the setting is not 01 and the setting is not 04 (No), the control device 7 updates the time t by the time interval Δt (step S54) and returns to step S50.
In step S51, if the system output power P_out (t-Δt) is equal to or less than the reference power P_eps (No), the control device 7 sets the system output power P_out (t) at time t to 0 (step S55), and FIG. The process proceeds to step S56.

When the wind power generation device 1 is suddenly restarted, the generated power P_in (t) rises sharply, and the stored amount C_bat (t) of the storage battery 3 sharply increases. When the storage amount C_bat (t) of the storage battery 3 increases, the water electrolytic cell device 4 is activated, and the water electrolytic cell device 4 consumes power, so that the increase in the storage amount C_bat (t) of the storage battery 3 is suppressed. However, if the increase in the grid output power P_out (t) is gradual and the increase in the generated power P_in (t) due to the sudden restart is rapid, the storage amount C_bat (t) of the storage battery 3 exceeds the maximum capacity CMAX of the storage battery 3. Will end up. In such a case, it is necessary to promote an increase in the grid output power P_out (t) and prevent the storage amount C_bat (t) of the storage battery 3 from exceeding the maximum capacity CMAX.

FIG. 9 is a flowchart for detecting the sudden restart of the wind power generation device 1 and changing the fluctuation range ΔP_c of the system output power P_out (t).
Upon receiving the node E in FIG. 8, the control device 7 measures the generated power P_in (t) (step S56) and determines whether or not the generated power P_in (t) exceeds the reference power P_eps (step S57). .. If the generated power P_in (t) is equal to or less than the reference power P_eps (No), the control device 7 returns to step S50 in FIG.

On the other hand, in step S57, if the generated power P_in (t) exceeds the reference power P_eps (Yes), whether the control device 7 is set 01 or setting 02 in which the fluctuation range ΔP_c is allowed to increase. Is determined (step S58). In step S58, if setting 01 or setting 02 (Yes), the control device 7 acquires the system output power P_out (t-Δt) at the time (t-Δt) (step S59), and detects a sudden restart. Acquire the difference reference ΔP_dif (step S60).
On the other hand, in step S58, if the control device 7 is not set 01 and is not set 02 (No), when the time t is updated by the time interval Δt (step S66), the control device 7 returns to the process of step S56.

Further, after step S60, the control device 7 causes the sudden restart of the wind power generation device 1 to be the difference between the generated power P_in (t) at the time t and the system output power P_out (t-Δt) at the time (t-Δt). (Step S61). That is, if the difference between the generated power P_in (t) and the system output power P_out (t-Δt) exceeds the power difference reference ΔP_dif (Yes), the control device 7 determines that it is a sudden restart and proceeds to the process of step S62. .. The control device 7 sets the maximum fluctuation width ΔP_c_max within the limited range in the fluctuation width ΔP_c (step S62), and updates the grid output power P_out (t-Δt) in the grid output power P_out (t) with the fluctuation width ΔP_c. Then (step S64), the process proceeds to step S65.

On the other hand, in step S61, if the difference between the generated power P_in (t) and the system output power P_out (t-Δt) at the time (t-Δt) is equal to or less than the power difference reference ΔP_dif, the control device 7 (No). It is determined that the restart is not sudden, and the process proceeds to step S63. When the control device 7 sets the normal fluctuation width ΔP_c_u in the fluctuation width ΔP_c (step S63) and updates the grid output power P_out (t-Δt) in the grid output power P_out (t) with the fluctuation width ΔP_c (step S64). ), Proceed to step S65.

In step S65, the control device 7 determines whether or not the system output power P_out (t) is smaller than the generated power P_in (t). If the system output power P_out (t) is smaller than the generated power P_in (t) (Yes), the control device 7 reverts to the process of step S56 when the time t is updated by the time interval Δt (step S66).
On the other hand, in step S65, if the system output power P_out (t) is equal to or higher than the generated power P_in (t) (No), the control device 7 ends a series of sudden restart processes, and returns to, for example, step S20 of FIG. Repeat the predictive diagnosis.

When the control device 7 detects the sudden restart of the wind power generation device 1, the system output power P_out (t) is increased by the maximum fluctuation range ΔP_c_max within the limit range. If the difference between the generated power P_in (t) and the grid output power P_out (t-Δt) is smaller than the power difference reference ΔP_dif, it is increased by the normal fluctuation range ΔP_c_u with respect to the grid output power P_out (t). By this control, the control device 7 suppresses the storage amount C_bat (t) of the storage battery 3 from becoming the maximum capacity CMAX or more.
The increase in the grid output power P_out (t) is not limited to the maximum fluctuation width ΔP_c_max within the limit range, but is an arbitrary value between the maximum fluctuation width ΔP_c_max within the limit range and the default fluctuation width ΔP_c_u. You may.

The control device 7 is a total of the fluctuation range of the system output power P_out (t), one type of threshold value related to the storage amount C_H2 (t) of the hydrogen tank 5, and four types of threshold values related to the storage amount C_bat (t) of the storage battery 3. Six types were used as control parameters. Further, the control device 7 controls the securing of the hydrogen storage amount in the hydrogen tank 5, the charge / discharge amount of the storage battery 3, the start / stop of the water electrolysis tank device 4, and the start / stop of the engine generator 6. 3 and the controls shown in FIGS. 5 to 9 are used.
The inventors verified the control method throughout the year using the test result data of the wind power generation device 1 of 365 days by the control device 7.

FIG. 10 is a graph showing an example of the control result of the wind power generation system S. The control result on the day when the power generated by the wind power generation device 1 P_in (t) suddenly stopped and then restarted is shown.

The graph in the first row from the top is a graph of generated power P_in (t) and system output power P_out (t). The generated power P_in (t) is shown by a thin hatched solid line. The grid output power P_out (t) is indicated by the dark black dashed line. The horizontal axis of the graphs in the 1st to 5th columns indicates a common time.

The setting 01 in the first graph is a time zone in which the system output power P_out (t) may be constant or may be increased, but should not be decreased. Setting 02 in the graph is a time zone in which the system output power P_out (t) is constant and cannot be increased or decreased. Setting 03 in the graph is a time zone in which the system output power P_out (t) may be constant or may be increased, but should not be decreased. Setting 04 in the graph is a time zone in which the system output power P_out (t) may be constant or may be decreased, but should not be increased.

The graph in the second row from the top is a graph of the storage amount C_bat (t) of the storage battery 3. In the graph, the maximum capacity CMAX of the storage battery 3, the threshold values H2, H1, L2, L1 of the storage amount C_bat (t), and the threshold values H2a, H1a, L2a, L1a are shown.

The graph in the third row from the top is a graph of the operating power P_ele (t) of the water electrolytic cell apparatus 4. The water electrolytic cell device 4 is activated when the storage amount C_bat (t) of the storage battery 3 is the threshold value H1a or the threshold value H1 or more (time t1, t8). The operating water electrolytic cell apparatus 4 is stopped when the storage amount C_bat (t) of the storage battery 3 is equal to or less than the threshold value L2a or the threshold value L2 (time t2, t9).

The fourth graph from the top is a graph of hydrogen storage amount C_H2 (t). The hydrogen storage amount C_H2 (t) increases with the operation of the water electrolytic cell device 4 and decreases with the operation of the engine generator 6.
The graph in the fifth row from the top is a graph of the generated power P_eng (t) of the engine generator 6. The engine generator 6 is started when the storage amount C_bat (t) of the storage battery 3 is equal to or less than the threshold value L1a or the threshold value L1 (time t4, t10, t12). The operating engine generator 6 is stopped when the storage amount C_bat (t) of the storage battery 3 exceeds the threshold value L2a or the threshold value L2 (time t5, t11, t13).

At time t3, as shown in the graph of the second stage, the threshold values H2, H1, L2, and L1 related to the storage amount C_bat (t) of the storage battery 3 are changed to the threshold values H2a, H1a, L2a, and L1a. This is the change control of the threshold value of the storage amount of the storage battery 3 shown in FIG.

As shown in the graphs of the first and second stages, the control device 7 predicts a sudden stop at the time t3 when the generated power P_in (t) is near the maximum, and the threshold value of the storage amount C_bat (t) of the storage battery 3 is reached. You can see that you are changing. By changing the threshold value of the storage amount C_bat (t) of the storage battery 3, the storage amount C_bat (t) of the storage battery 3 is maintained so as to be the threshold value C_bat_L2a after the change.

As shown in the graph of the first stage, the wind power generation device 1 suddenly stops at time t4. Time t4 is included in the time zone of setting 02 in which the grid output power P_out (t) must not be reduced.
As shown in the graph of the second stage, the wind power generation system S supplements and maintains the system output power P_out (t) by discharging from the storage battery 3. Therefore, the storage amount C_bat (t) of the storage battery 3 decreases.

As shown in the graph of the second stage, at time t4, the storage amount C_bat (t) of the storage battery 3 falls below the threshold value L1a due to the change of the threshold value of the storage amount C_bat (t) of the storage battery 3. At this time, as shown in the graph of the fifth stage, the engine generator 6 is started and the generated power P_eng (t) is started even though it is higher than the normal threshold value L2. As a result, it is possible to suppress a decrease in the storage amount C_bat (t) of the storage battery 3.

As shown in the graph of the first stage, the grid output power P_out (t) is decreasing after the time zone of the first setting 02 in which the grid output power P_out (t) cannot be reduced. The slope of the decline is greater than at other times. This is the result of the controls shown in FIGS. 7 and 8.
Further, at the time t5 in the process of the rapid decrease of the grid output power P_out (t), the change of the storage amount C_bat (t) of the storage battery 3 is canceled and returned to the normal level as shown in the graph of the second stage. .. This is the control shown in FIG. After that, at time t6, as shown in the second graph, the storage amount C_bat (t) of the storage battery 3 reaches the threshold value L2, so that the engine generator 6 is stopped and the generated power P_eng (t) becomes 0. Become.

As shown in the graph of the first stage, at time t7 immediately after the time zone of setting 03 in which the grid output power P_out (t) cannot be increased or decreased, the wind power generation device 1 suddenly restarts and the grid output power P_out (t) increases. .. The slope of the increase in the grid output power P_out (t) is the largest immediately after the sudden restart. This is the control shown in steps S60 and S62 of FIG. Here, if there is no increase in the system output power P_out (t) having a large slope immediately after the sudden restart, the storage amount C_bat (t) of the storage battery 3 exceeds the maximum capacity CMAX.

As a result, in the second graph showing the storage amount C_bat (t) of the storage battery 3, it was verified that the storage amount C_bat (t) did not exceed the maximum capacity CMAX and did not become 0. Further, in the fourth graph showing the storage amount C_H2 (t) of the hydrogen tank 5, it was verified that the storage amount C_H2 (t) did not exceed the maximum capacity HMAX and did not become 0.

As shown in the graph of FIG. 10, the power generated by the wind power generator 1 P_in (t), the system output power P_out (t), the stored amount C_bat (t) of the storage battery 3, and the operating power P_ele of the water electrolyzer tank device 4. (t), the stored amount C_H2 (t) of the hydrogen tank 5, and the measured values of the generated power P_eng (t) of the engine generator 6 are displayed on the monitor 71 of the control device 7, and the stored amount C_bat of the storage battery 3 is displayed. It is desirable to write the threshold value of (t) and the threshold value of the storage amount C_H2 (t) of the hydrogen tank 5 together. This makes it easier for the operator to grasp the control state of the wind power generation system S by the control device 7.

(Modification example)
The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. It is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is also possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

Each of the above configurations, functions, processing units, processing means, and the like may be partially or wholly realized by hardware such as an integrated circuit. Each of the above configurations, functions, and the like may be realized by software by the processor interpreting and executing a program that realizes each function. Information such as programs, tables, and files that realize each function can be placed in a recording device such as a memory, hard disk, SSD (Solid State Drive), or a recording medium such as a flash memory card or DVD (Digital Versatile Disk). can.

In each embodiment, the control lines and information lines indicate what is considered necessary for explanation, and do not necessarily indicate all the control lines and information lines in the product. In practice, it may be considered that almost all configurations are interconnected.

As a modification of the present invention, for example, there are the following (a) to (c).

(A) The control method of the present invention may be applied not only to a wind power generation device but also to a renewable energy power generation device that generates power by a fluid such as a hydroelectric power generation device, a geothermal power generation device, and a wave power generation device. ..
(B) The engine generator 6 may be a hydrogen-only engine generator, a hydrogen-only gas turbine generator, or a hydrogen-blended gas turbine generator that mixes hydrogen with LNG, and further generates electricity using hydrogen. It may be a fuel cell.
(C) The number of the wind power generation devices 1 is not limited to three, and may be one or more.

S Wind power generation system 1,1a to 1c Wind power generation equipment (an example of renewable energy power generation equipment)
11 Transformer 12, 13 Power meter 14 Bus 3 Storage battery 31 PCS for storage battery
32 Storage battery storage meter 4 Water electrolytic cell device 41 Transformer 42 AC / DC converter 43 Wattmeter 5 Hydrogen tank (hydrogen storage)
51 Hydrogen storage meter 6 Engine generator (generator)
61 Exhaust 62 Power meter 7 Controller 71 Monitor

Claims (8)

A step of causing one or more renewable energy power generation devices to generate power, which suddenly stops power generation when the flow velocity exceeds the first predetermined value.
A storage battery, a water electrolyzer tank device, a storage body for storing hydrogen generated in the water electrolyzer tank device, and a generator that generates electricity using the stored hydrogen can be used to change the power generated by the renewable energy power generation device. Steps to relax and
A step of measuring the storage amount of the storage battery and the storage amount of hydrogen,
In order to mitigate fluctuations in the power generated by the renewable energy power generation device, the charge / discharge of the storage battery is controlled according to the storage amount of the storage battery, and the water electrolytic tank device is controlled according to the storage amount of hydrogen. Steps to control the operating power and the generated power of the generator,
From the time course of the power generated by the renewable energy power generation device, the time change of the measured value of the flow meter installed in the renewable energy power generation device, or the time course of the angle of the blade installed in the renewable energy power generation device. Steps to foresee a sudden stop of the renewable energy power generator,
If the sudden stop of the renewable energy power generation device is foreseen, the step of increasing the threshold value for determining the storage capacity of the storage battery and
A predictive detection method for sudden fluctuations in renewable energy power generators, characterized by the execution of. From the time course of the generated power of the renewable energy power generation device, the time change of the measured value of the flow meter installed in the renewable energy power generation device, or the time course of the angle of the blade installed in the renewable energy power generation device. , A step to restore the threshold for determining the storage amount of the storage battery,
The method for predicting and detecting sudden fluctuations in a renewable energy power generation device according to claim 1 , wherein the method is performed. On the monitor that monitors the control, the storage amount of the storage battery, the measured value of the storage amount of the hydrogen, the threshold value of the storage amount of the storage battery, the change over time of the generated power of the renewable energy power generation device, and the renewable energy power generation device. A step of displaying the change over time of the measured value of the flow meter installed in the renewable energy power generation device and the change over time of the angle of the blade installed in the renewable energy power generation device.
The method for predicting and detecting sudden fluctuations in a renewable energy power generation device according to claim 1 , wherein the method is performed. From the time course of the generated power of the renewable energy power generation device, the time change of the measured value of the flow meter installed in the renewable energy power generation device, or the time course of the angle of the blade installed in the renewable energy power generation device. , The step of diagnosing a sudden stop of the renewable energy power generation device,
The method for predicting and detecting sudden fluctuations in a renewable energy power generation device according to any one of claims 1 to 3 , wherein the method is performed. After diagnosing the sudden stop of the renewable energy power generation device, the step of reducing the power output to the power system by an arbitrary value between the maximum fluctuation range within the limited range and the predetermined fluctuation range .
The method for predicting and detecting sudden fluctuations in a renewable energy power generation device according to claim 4 , wherein the method is performed. The renewable energy power generation device suddenly stops power generation and then suddenly restarts power generation when the flow velocity becomes weaker than the second predetermined value.
A step of diagnosing that the renewable energy power generation device has suddenly restarted from the measured value of the generated power of the renewable energy power generation device and the measured value of the power output to the power system.
The method for predicting and detecting sudden fluctuations in a renewable energy power generation device according to claim 5 , wherein the method is performed. If it is diagnosed that the renewable energy power generation device has restarted suddenly, the step of increasing the power output to the power system by an arbitrary value between the maximum fluctuation range within the limited range and the predetermined fluctuation range .
The method for predicting and detecting sudden fluctuations in a renewable energy power generation device according to claim 6 , wherein the method is performed. A renewable energy power generation device that suddenly stops power generation when the flow velocity exceeds the first predetermined value,
With a storage battery
A water electrolyzer that generates hydrogen and
A storage body that stores hydrogen generated in the water electrolyzer and
A generator that uses the stored hydrogen to generate electricity,
In order to measure the stored amount of the storage battery and the stored amount of hydrogen and mitigate the fluctuation of the generated power by the renewable energy power generation device, the charge / discharge of the storage battery is controlled according to the stored amount of the storage battery, and the charge / discharge is controlled. The operating power of the water electrolyzer and the power generated by the generator are controlled according to the amount of hydrogen stored.
From the time course of the power generated by the renewable energy power generation device, the time change of the measured value of the flow meter installed in the renewable energy power generation device, or the time course of the angle of the blade installed in the renewable energy power generation device. If the sudden stop of the renewable energy power generation device is foreseen, a control device that raises the threshold for determining the storage capacity of the storage battery and a control device.
A renewable energy power generation system characterized by being equipped with.

Images