Design method for combined battery storage system, control method for combined battery storage system, combined battery storage system

Abstract

To design and control an output type battery considering the life span and cost of the entire combined storage battery system, while considering the balance with a capacity type battery.SOLUTION: A method of designing a combined storage battery system includes: a basic required-power pattern input step (S1) of requiring, to a combined type storage battery, the magnitude of input / output of electric energy into a power network at each of the time; an output type / capacity type electric energy distribution step (S2) of distributing power with a predetermined distribution logic; an output type battery life span feature extraction step (S4) of extracting a life span feature that is an index indicating the deterioration of an output type battery; an output type battery load amount calculation step (S5) of calculating a load amount of the output type battery; an output type battery life span calculation step (S7); a total cost calculation step (S9) of calculating the total cost including an initial cost of capacitive type batteries at an initial setting number and a replacement cost of the output type battery; and an output type / capacity type optimum battery number determination step (S10) of determining the setting number of the output type batteries and the setting number of the capacity type batteries.SELECTED DRAWING: Figure 3

Claims

1. Communication equipment and A combined storage battery that combines multiple capacity batteries and multiple output batteries, A control device for controlling the input and output of the aforementioned combined-type storage battery and A method for designing a combined battery storage system, comprising: The control device includes a basic request power pattern input step in which it inputs the request power pattern Ptn as a basic request power pattern PtnB to the request power pattern Ptn which requests the magnitude of the amount of power input and output to the power grid from the combined battery at each time, A power distribution step in which, based on the basic power request pattern PtnB input in the basic power request pattern input step, the amount of power requested at each time is distributed at each time to the capacity type battery and to the output type battery using a predetermined distribution logic, A step of extracting output battery life features, in which, based on the amount of power of the output battery at each time that was distributed in the power distribution step, a predetermined life feature LC, which is an index indicating the degradation of the output battery, is extracted; A step to calculate the load amount BL of a predetermined number of output batteries, based on the life feature LC extracted in the step of extracting the life feature of the output battery, The process includes a step of calculating the lifespan of the output battery, which involves estimating and storing the lifespan of the output battery based on the load amount BL of the output battery. The number of output batteries in the step of calculating the output battery life is changed, the step of calculating the output battery load and the step of calculating the output battery life are repeated, and the lifespan of the output batteries for all the planned number of settings is stored. A total cost calculation step that calculates the total cost by adding the initial number of output batteries set, the initial cost of the number of capacity batteries set based on the number of output batteries set, and the replacement cost of the output batteries according to the lifespan of the output batteries. The step of determining the optimal number of batteries, which determines the number of output-type batteries and the number of capacity-type batteries that result in the lowest total cost in the step of calculating the total cost, A method for designing a combined battery storage system, characterized by having the following features.

2. The aforementioned distribution logic is, A design method for a combined battery storage system according to claim 1, characterized in that, of the power input and output by the basic power request pattern PtnB, the power of discharge up to or less than a set allocation threshold + DT and the power of charge up to or greater than the allocation threshold - DT are distributed to the capacity type battery, and the power of discharge exceeding the allocation threshold + DT and the power of charge less than the allocation threshold - DT are distributed to the output type battery.

3. The step of extracting output-type battery life features is as follows: The design method for a combined battery storage system according to claim 2, characterized in that, in the step of distributing the amount of power, the distribution threshold DT of the distribution logic is changed to one of several predetermined values ​​to distribute the amount of power of the output type battery at each time, and the lifetime feature quantity LC is extracted based on the distributed amount of power.

4. The steps for calculating the output battery load are as follows: The design method for a combined battery storage system according to claim 1, comprising a conversion table for converting the lifespan feature quantity LC of the output type battery into the load quantity BL which is correlated with the lifespan feature quantity LC, and comprising a lifespan feature quantity-to-load quantity conversion step of converting the lifespan feature quantity LC into the load quantity BL using the conversion table.

5. The steps for calculating the total cost are as follows: For each set number of output-type batteries, the set number of capacity-type batteries determined based on the set number of output-type batteries is set, The initial cost of the number of output-type batteries set, The initial cost of the number of capacity batteries set, The lifespan calculated in the step of calculating the output battery lifespan is the cost of replacement required within the planned lifespan of the combined battery. The design method for a combined battery storage system according to claim 1, characterized in that the total cost is calculated by accumulating the costs of the above.

6. When the continuous amount of energy distributed to the output battery is En [Ah] and the power is Pn [kW], the lifetime characteristic quantity LC is, Average |ΔPn|, Σ│En│=kWh / day, Average │En│, Average (maxΣEn-minΣEn) [kWh], The design method for a combined battery storage system according to claim 1, characterized in that it is the same as described in claim 1.

7. When the total energy of the output battery in that power pattern is Ah / day [Ah], the current value of the output battery is I [A], the change in SOC during one continuous charge or discharge is dSOC [%], and the change in SOC between the upper and lower limits in that power pattern is ΔSOC, then the load amount BL is, Ah / day [Ah], Average I² value [A], dSOC[%], ΔSOC [%] The design method for a combined battery storage system according to claim 1, characterized in that it is the same as described in claim 1.

8. The design method for a combined battery system according to claim 1, characterized in that the output battery is a nickel-metal hydride battery.

9. The design method for a combined battery storage system according to claim 1, characterized in that the capacity battery is a lithium-ion secondary battery.

10. The system includes a communication device, a combined-type storage battery comprising multiple capacity batteries and multiple output batteries, and a control device that controls the input and output of the combined-type storage battery. A basic request power pattern input means inputs a request power pattern Ptn as a basic request power pattern PtnB to a request power pattern Ptn that requests the magnitude of power input and output to the power grid for the aforementioned combined battery at each time interval, A power distribution means that, based on the basic power request pattern PtnB input by the basic power request pattern input means, distributes the amount of power requested at each time into an amount of power to be distributed to a capacity type battery and an amount of power to be distributed to an output type battery, according to a predetermined distribution logic, at each time. An output battery life feature extraction means extracts a life feature LC, which is a predetermined indicator of the degradation of the output battery, based on the amount of power of the output battery at each time distributed by the power distribution means. An output battery load calculation means calculates a preset number of output batteries, BL, based on the life feature LC extracted by the output battery life feature extraction means, The system includes an output battery life calculation means that estimates and stores the lifespan of the output battery based on the load amount BL of the output battery, The number of output batteries in the output battery life calculation means is changed, and the output battery load calculation means and the output battery life calculation means store the lifespan of all the output batteries for the planned number of settings. A total cost calculation means that calculates the total cost by adding the initial number of output batteries set, the initial cost of the number of capacity batteries determined based on the number of output batteries set, and the replacement cost of the output batteries according to their lifespan. The optimal number of batteries in the total cost calculation means determines the number of output batteries and capacity batteries that have the lowest total cost. A combined battery storage system characterized by having the following features.

11. The aforementioned combined battery system has a display device. The control device is Under the conditions of the aforementioned combined battery storage system, a load three-dimensional map creation means creates a three-dimensional map of the life feature quantity LC of the output battery, which represents a threshold value of the range of lifespan that the output battery can tolerate, in the three-dimensional coordinate space of the life feature quantity LC, and displays it on the display device; The combined battery system according to claim 10, further comprising a power request pattern display device that displays the position of the power request pattern Ptn in the three-dimensional coordinate space based on the lifetime feature quantity LC extracted from the input power request pattern Ptn.

12. A control method for a combined battery storage system according to claim 11, In the conditions of the combined battery storage system, the steps include creating a load three-dimensional map, which is created in the three-dimensional coordinate space of the lifespan feature quantity LC of the output battery to represent a threshold value of the range of lifespan that the output battery can tolerate, and displaying it on the display device; A control method for a combined battery storage system, characterized by comprising a power pattern display step, in which the position of the requested power pattern Ptn is displayed in the three-dimensional coordinate space based on the lifetime feature quantity LC extracted from the input requested power pattern Ptn.

13. A control method for a combined battery storage system according to claim 11, A new request power pattern input step involves inputting a new request power pattern Ptn as a new request power pattern PtnN to the aforementioned combined-type storage battery, which requests the magnitude of the input and output of energy [Wh] to the power grid at each time interval, and A control method for a combined battery system, characterized by comprising the step of controlling the input and output of the combined battery to the power grid according to the new power request pattern PtnN.

14. The input / output control step is characterized by changing the input / output control conditions so that the new power request pattern PtnN falls within a threshold range of the acceptable lifespan range of the output battery displayed in the three-dimensional map, thereby changing the lifespan feature quantity LC.

15. A step of storing the new requested power pattern, The steps include: calculating the average power request pattern by averaging the updated power request pattern PtnR accumulated in the new power request pattern accumulation step, and calculating the average power request pattern PtnA; The control method for a combined battery storage system according to claim 14, further comprising a step of updating the basic power request pattern, in which the basic power request pattern PtnB is replaced with the average power request pattern PtnA, and the average power request pattern PtnA is used as the new basic power request pattern PtnB to perform the input / output control.

16. The system includes a communication device, a combined-type storage battery comprising multiple capacity batteries and multiple output batteries, and a control device that controls the input and output of the combined-type storage battery. A basic request power pattern input means inputs a request power pattern Ptn as a basic request power pattern PtnB to a request power pattern Ptn that requests the magnitude of power input and output to the power grid for the aforementioned combined battery at each time interval, A power distribution means that, based on the basic power request pattern PtnB input by the basic power request pattern input means, distributes the amount of power requested at each time into an amount of power to be distributed to a capacity type battery and an amount of power to be distributed to an output type battery, according to a predetermined distribution logic, at each time. An output battery life feature extraction means extracts a life feature LC, which is a predetermined indicator of the degradation of the output battery, based on the amount of power of the output battery at each time distributed by the power distribution means. An output battery load calculation means calculates a preset number of output batteries, BL, based on the life feature LC extracted by the output battery life feature extraction means, A combined battery storage system is characterized by comprising an output battery life calculation means that estimates and stores the life of the output battery based on the load amount BL of the output battery, Regardless of the basic power requirement pattern, the lifespan characteristics are extracted based on the amount of power actually input and output to the output battery, and the actual load amount BLreal of the output battery is calculated. A combined battery storage system characterized by comprising an output-type battery remaining life determination means for estimating the lifespan of the output-type battery.

17. The combined battery system according to claim 16, characterized in that the actual load amount BLreal is a degradation amount based on dSOC [%], which is the change in SOC during one continuous charge or discharge.

18. The combined battery system according to claim 17, characterized in that the actual load amount BLreal is the amount of corrosion of the negative electrode alloy.

19. The combined battery system according to claim 18, characterized in that the amount of corrosion of the negative electrode alloy is calculated and accumulated by determining the value for each unit time.

20. The combined battery system according to claim 19, characterized in that the amount of corrosion of the negative electrode alloy is calculated by referring to the reaction rate based on the Arrhenius law, using the battery temperature at the time of measurement of the actual input and output power.

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