Control device, and storage battery system

Abstract

To provide a control device which performs control including integration control, applies a limiter to output and is capable of performing control corresponding to a command value even if a limit value of the limiter is variable.SOLUTION: A control device A1 comprises: a control section 141 which calculates a deviation between an inputted detection value and a command value and outputs a compensation value Y including an integration component based on an integration value of the deviation; and a limiter 142 by which the compensation value Y outputted from the control section 141 is limited to a value between an upper limit value Ymax and a lower limit value Ymin and outputted and in which the upper limit value Ymax and the lower limit value Ymin are changed. In a case where the compensation value Y is limited by the limiter 142, the control section 141 uses an arithmetic value C based on the upper limit value Ymax or the lower limit value Ymin as an integration value X in the next processing.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a control device and a storage battery system including the control device. [Background technology]

[0002] Patent Document 1 discloses a power conversion device. The power conversion device includes a power conversion unit and a control device that controls the power conversion unit. The control device includes an AC power control unit, an AC control unit, and a limit control unit. The AC power control unit performs, for example, PI control (proportional-integral control) so that the deviation between the AC power command value and the detected AC power becomes zero, and outputs an AC current command value. The AC control unit limits the AC current command value to a range that conforms to the AC current limit value set by the limit control unit, and performs, for example, PI control so that the deviation between the AC current command value after the limit and the detected AC current becomes zero, and outputs a control calculation result.

[0003] During a transient period when a large deviation occurs in the AC power control unit, the AC current command value is limited, but the integral value in the PI control increases, which is called windup. In this case, even if the AC power reaches the AC power command value, it takes time to reduce the increased integral value, so overshoot occurs. This causes a problem of deterioration in the responsiveness and stability of the system. To address this problem, a measure called anti-windup is generally taken, which stops the increase in the integral value when a limit value is imposed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7224468 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when anti-windup is performed, if the limit value changes during operation, unintended operation may occur as follows. (1) After a large limit value is applied, (2) the limit value is switched to a small limit value, and (3) the AC power command value may then be changed to a small value (a level at which the AC current command value is not limited by the small limit value). In this case, the output power of the power conversion device should change to follow the changed AC power command value, but the output power corresponding to the small limit value may continue. In (1), the integral value is fixed to the value at the large limit value by anti-windup, and in (2), the limit value is simply switched, so the integral value is held. Then, even if the AC power command value is changed to a small value in (3), the AC current command value calculated based on the held integral value will be equal to or greater than the small limit value. In this case, the AC current command value is limited to a small limit value, the integral value does not decrease, and the AC current command value output from the AC power control unit does not decrease. As a result, it is not possible to follow the AC power command value changed in (3), and the output power at (2) continues.

[0006] FIG. 4 is a time chart for explaining the above-mentioned unintended operation. FIG. 4(a) shows the change over time of the power command value (AC power command value), and FIG. 4(b) shows the change over time of the upper limit value (limit value) of the limiter. FIG. 4(c) shows the change over time of the integral value, and FIG. 4(d) shows the change over time of the detection value of the output power. At time t1, the power command value is changed from "0" to P1, so that the integral value increases, and the power detection value also increases. However, due to the restriction of the upper limit value of the limiter, the power detection value does not increase to P1. At time t2, the upper limit value is changed from Ymax1 to Ymax2, so that the power detection value decreases. On the other hand, the integral value remains at the value before time t2 and does not change. At time t3, the power command value is changed from P1 to "0", but the integral value does not change. The AC current command value calculated based on the integral value is equal to or greater than the upper limit value Ymax2, so it is limited to the upper limit value Ymax2. Because the AC current command value does not change, the detected power value also does not change, and the value before time t3 is maintained. In other words, the detected power value should originally follow the power command value of "0" from time t3, decreasing to "0", but it does not follow the change in the power command value and maintains the value before the change.

[0007] The present invention has been devised in light of the above-mentioned circumstances, and aims to provide a control device that performs control including integral control, applies a limiter to the output, and is capable of control according to a command value even if the limiting value of the limiter is variable. [Means for solving the problem]

[0008] A control device provided by a first aspect of the present invention includes a control unit that calculates the deviation between an input detection value and a command value, and outputs a compensation value including an integral component based on an integral value of the deviation, and a limiter that limits the compensation value output from the control unit to a value between an upper limit value and a lower limit value, and the upper limit value and the lower limit value vary, and when the compensation value is limited by the limiter, the control unit uses a calculated value based on the upper limit value or the lower limit value as the integral value in a subsequent process.

[0009] In a preferred embodiment of the present invention, the calculated value is a value that sets the compensation value to the upper limit value or the lower limit value.

[0010] In a preferred embodiment of the present invention, the control unit performs PI control with a proportional gain of Kp and an integral gain of Ki, and, where U is the deviation, C is the calculated value, Y is the compensation value, Ymax is the upper limit value, and Ymin is the lower limit value, when Y is greater than Ymax, the calculated value C is calculated by C=((Ymax-Kp*U) / Ki), and when Y is smaller than Ymin, the calculated value C is calculated by C=((Ymin-Kp*U) / Ki).

[0011] In a preferred embodiment of the present invention, a power detection unit detects a power value of AC power output by an inverter device, and a command value setting unit sets a power command value that commands the power value, and a drive signal generating unit that generates a drive signal to be output to the inverter device based on the limited compensation value output by the limiter, wherein the control unit receives as input the power value detected by the power detection unit as the detected value and the power command value set by the command value setting unit as the command value.

[0012] A power storage system provided according to a second aspect of the present invention includes the control device provided according to the first aspect of the present invention, the inverter device, and a storage battery connected to a DC side of the inverter device. Effect of the Invention

[0013] According to the present invention, the control unit performs control including integral control, and when the compensation value is limited by the limiter, a calculated value based on the upper limit value or the lower limit value is used as the integral value in the next process. As a result, when the compensation value is limited by the limiter when the upper limit value and the lower limit value of the limiter change, the integral value used in the next process becomes a calculated value based on the upper limit value or the lower limit value after the change, and is not fixed to a value according to the upper limit value or the lower limit value before the change. Therefore, the control device according to the present invention is capable of control according to a command value even if the limit value of the limiter is variable. [Brief description of the drawings]

[0014] [Figure 1] 1 is a block diagram showing the overall configuration of a storage battery system including a control device according to a first embodiment. [Diagram 2] 4 is an example of a flowchart illustrating a power control process performed by a power control unit. [Diagram 3] 4 is a time chart showing the results of a simulation performed on the storage battery system according to the first embodiment. [Figure 4] 11 is a time chart for explaining an unintended operation in conventional integral control. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0016] 1 is a block diagram showing the overall configuration of a storage battery system B including a control device A1 according to a first embodiment. The storage battery system B includes an inverter device 2, a storage battery 3, a current sensor 4, a voltage sensor 5, and the control device A1. The storage battery system B charges the storage battery 3 with power supplied from a power grid, and, in a predetermined case, discharges the storage battery 3 to output power.

[0017] In this embodiment, the storage battery 3 is a secondary battery that can be repeatedly charged and discharged, for example, a lithium ion battery. The storage battery 3 may be other secondary batteries such as a nickel-metal hydride battery, a nickel-cadmium battery, or a lead-acid battery. The storage battery 3 may be a capacitor such as an electric double layer capacitor instead of a secondary battery.

[0018] The inverter device 2 has a storage battery 3 connected to its DC output terminal, and charges and discharges the storage battery 3. The inverter device 2 charges the storage battery 3 by converting AC power input from the AC side into DC power and supplying it to the storage battery 3. The inverter device 2 also converts DC power stored in the storage battery 3 into AC power and outputs it to the AC side, thereby discharging the storage battery 3. The charging and discharging performed by the inverter device 2 is controlled by a control device A1. The inverter device 2 converts between DC power and AC power by switching a switching element (not shown) on and off based on a drive signal input from the control device A1.

[0019] The current sensor 4 is disposed on the AC side of the inverter device 2 and detects the output current on the AC side of the inverter device 2. The current sensor 4 outputs a detected current detection signal to the control device A1. The voltage sensor 5 is disposed on the AC side of the inverter device 2 and detects the output voltage on the AC side of the inverter device 2. The voltage sensor 5 outputs a detected voltage detection signal to the control device A1.

[0020] The control device A1 is realized by, for example, a microcomputer, and controls the inverter device 2. The control device A1 generates a drive signal based on a current detection signal input from a current sensor 4 and a voltage detection signal input from a voltage sensor 5. The control device A1 inputs the generated drive signal to the inverter device 2 to control power conversion by the inverter device 2.

[0021] The control device A1 has, as its functional components, a command value setting unit 11, a power detection unit 12, a limiter calculation unit 13, a power control unit 14, a current control unit 15, and a drive signal generation unit 16. Each unit may be configured with a digital circuit or an analog circuit. The control device A1 also has other functional components, but descriptions thereof will be omitted.

[0022] The command value setting unit 11 has a functional configuration for setting a power command value, which is a command value for AC power output by the inverter device 2. The command value setting unit 11 sets the power command value based on an operation signal input by an operator operating an operation means (not shown). The command value setting unit 11 may set the power command value according to a predetermined program. The command value setting unit 11 outputs the power command value to the power control unit 14.

[0023] The power detection unit 12 detects the power value of the AC power output by the inverter device 2. The power detection unit 12 calculates the power value of the active power based on the current detection signal input from the current sensor 4 and the voltage detection signal input from the voltage sensor 5. The power detection unit 12 outputs the calculated power value to the power control unit 14.

[0024] The limiter calculation unit 13 has a functional configuration that calculates an upper limit value Ymax and a lower limit value Ymin to be set in a limiter 142 of the power control unit 14, which will be described later. The switching elements included in the inverter device 2 have temperature characteristics in which the temperature rises when the power factor is lower even when the same current flows. In order to accommodate this temperature characteristic, in this embodiment, when the power factor is low, the current command value output by the power control unit 14 is more limited. For this reason, the limiter calculation unit 13 changes the upper limit value Ymax and the lower limit value Ymin to be set in the limiter 142 of the power control unit 14 according to the power factor.

[0025] The limiter calculation unit 13 calculates the power factor of the AC power output by the inverter device 2 based on the current detection signal input from the current sensor 4 and the voltage detection signal input from the voltage sensor 5. Then, the limiter calculation unit 13 compares the calculated power factor with a threshold value to determine the upper limit value Ymax and the lower limit value Ymin. Specifically, when the power factor is equal to or greater than the threshold value, the limiter calculation unit 13 sets the upper limit value Ymax and the lower limit value Ymin to the upper limit value Ymax1 and the lower limit value Ymin1 of suppression level 1. Although the upper limit value Ymax1 and the lower limit value Ymin1 of suppression level 1 are not limited, for example, a value on the order of the rated current is set. Also, the upper limit value Ymax1 and the lower limit value Ymin1 may have the same absolute value or different absolute values. On the other hand, when the power factor is less than the threshold value, the limiter calculation unit 13 sets the upper limit value Ymax and the lower limit value Ymin to the upper limit value Ymax2 (<Ymax1) and the lower limit value Ymin2 (>Ymin1) of suppression level 2. Although the upper limit value Ymax2 and the lower limit value Ymin2 of suppression level 2 are not limited, for example, a value on the order of 10% of the rated current is set. Also, the upper limit value Ymax2 and the lower limit value Ymin2 may have the same absolute value or different absolute values. Also, the threshold value for comparison with the calculated power factor is not limited and is appropriately determined based on experiments or simulations.

[0026] As described above, in the present embodiment, the limiter calculation unit 13 switches the upper limit value Ymax and the lower limit value Ymin in two stages according to the power factor. Note that the limiter calculation unit 13 may switch the upper limit value Ymax and the lower limit value Ymin in three or more stages. Also, in the present embodiment, the case where the limiter calculation unit 13 determines the upper limit value Ymax and the lower limit value Ymin according to the power factor has been described, but the present invention is not limited to this. The limiter calculation unit 13 may determine the upper limit value Ymax and the lower limit value Ymin according to other elements instead of or in addition to the power factor. The limiter calculation unit 13 outputs the determined upper limit value Ymax and lower limit value Ymin to the power control unit 14.

[0027] The power control unit 14 is a functional configuration that controls the AC power output by the inverter device 2. The power control unit 14 includes a control unit 141 and a limiter 142.

[0028] The control unit 141 performs control so that the power value input from the power detection unit 12 becomes the power command value input from the command value setting unit 11. Specifically, the control unit 141 calculates a power deviation by subtracting the power value input from the power detection unit 12 from the power command value input from the command value setting unit 11. Then, the control unit 141 calculates a compensation value by PI control (proportional-integral control) based on the calculated power deviation. If the power deviation is U, the integral value is X, the proportional gain is Kp, and the integral gain is Ki, the compensation value Y is calculated based on the following (1). In this embodiment, the integral value X uses a value calculated in the previous control cycle, and if the control cycle is T, it is calculated based on the following (2). The control unit 141 outputs the calculated compensation value Y to the limiter 142. Y = Kp * U + Ki * X (1) X=X+T*U (2)

[0029] The limiter 142 limits the compensation value Y output from the control unit 141 to a predetermined range and outputs it. The limiter 142 limits the compensation value Y to a value between the upper limit value Ymax and the lower limit value Ymin input from the limiter calculation unit 13. Since the upper limit value Ymax and the lower limit value Ymin change, the range limited by the limiter 142 changes. When the compensation value Y is equal to or less than the upper limit value Ymax and equal to or more than the lower limit value Ymin, the limiter 142 outputs the compensation value Y as it is. On the other hand, when the compensation value Y is greater than the upper limit value Ymax, the limiter 142 outputs the upper limit value Ymax as the compensation value Y, and when the compensation value Y is less than the lower limit value Ymin, the limiter 142 outputs the lower limit value Ymin as the compensation value Y. The power control unit 14 outputs the compensation value Y limited by the limiter 142 to the current control unit 15 as a current command value.

[0030] Since the compensation value Y output from the control unit 141 is limited to a predetermined range by the limiter 142, the control unit 141 is provided with measures to prevent the occurrence of wind-up. However, since the upper limit value Ymax and the lower limit value Ymin set in the limiter 142 change, if anti-wind-up is performed and the integral value is simply fixed, problems will occur in the above-mentioned cases (1) to (3). In this embodiment, the control unit 141 is provided with measures to prevent the problems that occur in the above-mentioned cases (1) to (3).

[0031] Specifically, when the calculated compensation value Y is equal to or less than the upper limit value Ymax and equal to or more than the lower limit value Ymin, the control unit 141 calculates the integral value X based on the above formula (2). In this case, the limiter 142 outputs the compensation value Y calculated by the control unit 141 as it is. On the other hand, when the calculated compensation value Y is greater than the upper limit value Ymax, the control unit 141 calculates a calculation value C based on the following formula (3) and sets the calculated calculation value C as the integral value X. The calculation value C is a value that sets the compensation value Y to the upper limit value Ymax, and the following formula (3) is derived by modifying the above formula (1) in which Y=Ymax and X=C. In other words, instead of calculating the integral value X using the above formula (2), the control unit 141 sets the calculation value C based on the upper limit value Ymax as the integral value X. In this case, the limiter 142 limits the compensation value Y calculated by the control unit 141 to the upper limit value Ymax and outputs it. Furthermore, when the calculated compensation value Y is smaller than the lower limit value Ymin, the control unit 141 calculates a calculation value C based on the following formula (4) and sets the calculated calculation value C as the integral value X. The calculation value C is a value that sets the compensation value Y to the lower limit value Ymin, and the following formula (4) is derived by modifying the above formula (1) in which Y=Ymin and X=C. That is, instead of calculating the integral value X using the above formula (2), the control unit 141 sets the calculation value C based on the lower limit value Ymin as the integral value X. In this case, the limiter 142 limits the compensation value Y calculated by the control unit 141 to the lower limit value Ymin and outputs it. C=((Ymax-Kp*U) / Ki) ···· (3) C=((Ymin-Kp*U) / Ki) ···· (4)

[0032] 2 is an example of a flowchart showing the power control process performed by the power control unit 14. The power control process is executed at each predetermined control period after the control device A1 is started up.

[0033] First, the power deviation U is calculated (S1). Specifically, the control unit 141 obtains the power value detected by the power detection unit 12 and the power command value set by the command value setting unit 11, and calculates the power deviation U by subtracting the power value from the power command value. Next, the provisional integral value Xtemp is calculated (S2). Specifically, the control unit 141 calculates and stores the provisional integral value Xtemp from the previous integral value X based on the above formula (2). Next, the compensation value Y is calculated (S3). Specifically, the control unit 141 calculates the compensation value Y from the integral value X and the power deviation U based on the above formula (1).

[0034] Next, it is determined whether the compensation value Y is greater than the upper limit value Ymax (S4). Specifically, the control unit 141 makes this determination by comparing the compensation value Y with the upper limit value Ymax (Ymax1 or Ymax2) acquired from the limiter calculation unit 13. If the compensation value Y is greater than the upper limit value Ymax (S4: YES), a calculation value C based on the upper limit value Ymax is calculated and set to the integral value X (S5). Specifically, the control unit 141 calculates the calculation value C based on the above formula (3) and sets the calculated calculation value C to the integral value X. Next, the upper limit value Ymax is set to the compensation value Y (S6), the compensation value Y is output (S7), and the power control process ends. Specifically, the limiter 142 limits the compensation value Y to the upper limit value Ymax and outputs it.

[0035] In step S4, if the compensation value Y is equal to or less than the upper limit value Ymax (S4: NO), it is determined whether the compensation value Y is smaller than the lower limit value Ymin (S8). Specifically, the control unit 141 makes this determination by comparing the compensation value Y with the lower limit value Ymin (Ymin1 or Ymin2) acquired from the limiter calculation unit 13. If the compensation value Y is smaller than the lower limit value Ymin (S8: YES), a calculation value C based on the lower limit value Ymin is calculated and set to the integral value X (S9). Specifically, the control unit 141 calculates the calculation value C based on the above formula (4) and sets the calculated calculation value C to the integral value X. Next, the lower limit value Ymin is set to the compensation value Y (S10), the compensation value Y is output (S7), and the power control process ends. Specifically, the limiter 142 limits the compensation value Y to the lower limit value Ymin and outputs it.

[0036] In step S8, if the compensation value Y is equal to or greater than the lower limit value Ymin (S8: NO), it is determined that the compensation value Y is within the range limited by the limiter 142, the provisional integral value Xtemp is set to the integral value X (S11), the compensation value Y is output (S7), and the power control process ends. Note that the process shown in the flowchart of Fig. 2 is an example, and the power control process performed by the power control unit 14 is not limited to the above. For example, in step S3, the provisional integral value Xtemp may be used instead of the integral value X when calculating the compensation value Y.

[0037] The current control unit 15 has a functional configuration that controls the AC current output by the inverter device 2. The current control unit 15 includes a control unit 151 and a limiter 152. The control unit 151 calculates an effective current value based on a current detection signal input from the current sensor 4, and performs control so that the calculated effective current value becomes the current command value input from the power control unit 14. Specifically, the control unit 151 calculates a current deviation by subtracting the calculated effective current value from the current command value input from the power control unit 14. Then, the control unit 151 calculates a compensation value by PI control based on the calculated current deviation, and outputs it to the limiter 152.

[0038] The limiter 152 limits the compensation value output from the control unit 151 to a predetermined range and outputs the value. Unlike the limiter 142, the limiting range of the limiter 152 is fixed and does not change. Note that the limiting range of the limiter 152 may also be changed, similar to the limiter 142. In this case, the control unit 151 needs to take the same measures as the control unit 141. The current control unit 15 outputs the compensation value after the limiting by the limiter 152 to the drive signal generation unit 16.

[0039] The drive signal generating unit 16 generates a drive signal based on the compensation value input from the current control unit 15. The drive signal generating unit 16 generates a voltage command signal based on the compensation value, and generates the drive signal by comparing the voltage command signal with a carrier signal such as a triangular wave. Note that the method by which the drive signal generating unit 16 generates the drive signal is not limited. The drive signal generated by the drive signal generating unit 16 is output to the inverter device 2.

[0040] FIG. 3 is a time chart showing the results of a simulation performed on the battery storage system B. FIG. 3(a) shows the change over time of the power command value set by the command value setting unit 11. FIG. 3(b) shows the change over time of the upper limit value Ymax set by the limiter calculation unit 13. FIG. 3(c) shows the change over time of the integral value X set by the control unit 141. FIG. 3(d) shows the change over time of the power detection value of the AC power output by the inverter device 2, detected by the power detection unit 12. This simulation shows a case where the power command value is changed from "0" to P1 at time t1, the upper limit value Ymax is changed from Ymax1 to Ymax2 at time t2, and the power command value is changed from P1 to "0" at time t3.

[0041] At time t1, the power command value is changed from "0" to P1, so that the integral value increases and the power detection value also increases. However, the power detection value does not increase to P1 due to the limitation of the upper limit value Ymax (Ymax1) by the limiter 142. At time t2, the upper limit value is changed from Ymax1 to Ymax2, so that the compensation value Y (current command value) is limited by the limitation of the upper limit value Ymax (Ymax2) by the limiter 142, and the output of the inverter device 2 is suppressed. As a result, the power detection value decreases. Also, since the compensation value Y is greater than the upper limit value Ymax (Ymax2), the calculation value C is calculated based on the above formula (3) and set to the integral value X. As a result, the integral value X decreases to a value corresponding to the upper limit value Ymax (Ymax2). At time t3, the power command value is changed from P1 to "0", so that the integral value X decreases. After time t2, the integral value X is a value corresponding to the upper limit value Ymax (Ymax2), so it is not fixed to a large value. As the integral value X decreases, the detected power value decreases in accordance with the power command value, and becomes "0."

[0042] Next, the operation and effects of the control device A1 according to this embodiment will be described.

[0043] According to this embodiment, the control unit 141 performs PI control, and when the compensation value Y is greater than the upper limit value Ymax, the calculation value C based on the upper limit value Ymax is set as the integral value X, and when the compensation value Y is smaller than the lower limit value Ymin, the calculation value C based on the lower limit value Ymin is set as the integral value X. Then, the control unit 141 performs processing using the integral value X in the next control cycle. As a result, when the upper limit value Ymax and the lower limit value Ymin set in the limiter 142 change and the compensation value Y is limited by the limiter 142, the integral value X used in the processing of the next control cycle becomes the calculation value C based on the upper limit value Ymax or the lower limit value Ymin after the change, and is not fixed to a value according to the upper limit value Ymax or the lower limit value Ymin before the change. Therefore, the control device A1 can perform control according to the command value even if the limit value of the limiter 142 is variable.

[0044] Furthermore, according to this embodiment, when the compensation value Y is greater than the upper limit value Ymax, the control unit 141 calculates the calculation value C based on the above formula (3). The calculation value C is a value that sets the compensation value Y to the upper limit value Ymax. Furthermore, when the compensation value Y is smaller than the lower limit value Ymin, the control unit 141 calculates the calculation value C based on the above formula (4). The calculation value C is a value that sets the compensation value Y to the lower limit value Ymin. Therefore, the control device A1 can set the calculation value C to an appropriate value based on the changed upper limit value Ymax or lower limit value Ymin.

[0045] According to the present embodiment, the power control unit 14 calculates a power deviation U by subtracting the power value input from the power detection unit 12 from the power command value input from the command value setting unit 11, and calculates a compensation value Y by PI control based on the calculated power deviation U. The power control unit 14 outputs the compensation value Y after the limiter 142 is limited to the current control unit 15 as a current command value. The current control unit 15 calculates a current deviation by subtracting the effective current value from the current command value input from the power control unit 14, and calculates a compensation value by PI control based on the calculated current deviation. The current control unit 15 outputs the compensation value after the limiter 152 is limited to the drive signal generation unit 16. The drive signal generation unit 16 generates a drive signal based on the compensation value input from the current control unit 15, and outputs the drive signal to the inverter device 2. This allows the control device A1 to control the output power and output current of the inverter device 2.

[0046] In the present embodiment, the control unit 141 of the power control unit 14 performs PI control, but this is not limiting. The control unit 141 may perform PID control (proportional integral differential control) or I control (integral control). The above formulas (1), (3), and (4) are formulas according to the control performed by the control unit 141.

[0047] In addition, in this embodiment, the case where the control device according to the present invention is applied to the power control unit 14 of the control device A1 of the storage battery system B has been described, but the present invention is not limited to this. The control device according to the present invention can also be applied to the current control unit 15 of the control device A1. The control device according to the present invention may also be applied to control devices of other systems.

[0048] The control device and the storage battery system according to the present invention are not limited to the above-described embodiment. The specific configurations of the components of the control device and the storage battery system according to the present invention can be freely designed in various ways. [Explanation of symbols]

[0049] A1: control device, 11: command value setting unit, 12: power detection unit, 141: control unit, 142: limiter, 16: drive signal generation unit, 2: inverter device, 3: storage battery

Claims

1. a control unit that calculates a deviation between an input detection value and a command value, and outputs a compensation value including an integral component based on an integral value of the deviation; a limiter that limits the compensation value output from the control unit to a value between an upper limit value and a lower limit value and outputs the limit, and the upper limit value and the lower limit value are variable; Equipped with When the compensation value is limited by the limiter, the control unit uses a calculated value based on the upper limit value or the lower limit value as the integral value in a subsequent process. Control device.

2. The calculated value is a value that sets the compensation value to the upper limit value or the lower limit value. The control device according to claim 1 .

3. The control unit is PI control is performed with proportional gain Kp and integral gain Ki. When the deviation is U, the calculated value is C, the compensation value is Y, the upper limit value is Ymax, and the lower limit value is Ymin, When Y is greater than Ymax, the calculated value C is calculated by C=((Ymax-Kp*U) / Ki); When Y is smaller than Ymin, the calculated value C is calculated by C=((Ymin-Kp*U) / Ki). The control device according to claim 1 .

4. a power detection unit that detects a power value of AC power output by the inverter device; a command value setting unit that sets a power command value that commands the power value; a drive signal generating unit that generates a drive signal to be output to the inverter device based on the limited compensation value output by the limiter; Further equipped with the control unit receives as input the power value detected by the power detection unit as the detected value, and receives as input the power command value set by the command value setting unit as the command value, 4. The control device according to claim 1.

5. A control device according to claim 4; The inverter device; A storage battery connected to a DC side of the inverter device; A battery storage system comprising:

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