JP2007124719A - Power storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power storage device in which the characteristics that an electric double layer capacitor has a long lifetime and a limited withstand voltage range can be utilized effectively. <P>SOLUTION: The large output, high capacity power storage device, i.e. a capacitor system 10, comprises a plurality (e.g. twelve) of modules 11 which can contain a plurality (e.g. one hundred) of electric double layer capacitor cells 12, a plurality (e.g. three) of modular series circuits 21 where a plurality (e.g. four) of modules 11 are connected in series, and an I/O circuit 24 for connecting the modular series circuits 21 in parallel with a transmission route 3 through a power converter 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement of a power storage device that is connected to a power transmission path and performs charging and discharging.

For example, in a power generation facility that uses natural energy, such as a wind power generator or a solar power generator, the output (electric power) of the power generation facility fluctuates according to changes in natural conditions. (See Patent Documents 1 to 6).
JP 2001-286076 A JP 2001-298772 A JP2002-017044 JP2002-017044 JP 2002-101557 A JP 2003-087993 A

  Such power storage devices are often composed of secondary batteries. Rechargeable batteries deteriorate quickly when charging and discharging in a short cycle due to output fluctuations of power generation facilities extend over a long period of time, so it is necessary to use a large amount of secondary batteries or replace them in a short period of time. There was a problem of increasing. As a countermeasure, it is conceivable to use an electric double layer capacitor, but it cannot be effectively utilized by simply replacing the secondary battery.

  The present invention has been made paying attention to such a problem, and provides an electric power storage device that can effectively utilize the characteristic that the electric double layer capacitor has a long life and the limited withstand voltage range. Objective.

  In the present invention, in a power storage device connected to a power transmission path for charging and discharging, a plurality of modules in which a plurality of electric double layer capacitor cells are housed, a plurality of modular series circuits that connect the modules in series, and each modular series An input / output circuit that connects a circuit to a power transmission path in parallel via a power converter, and an electrical cutoff switch that intermittently connects each modular series circuit between each module, and opens each electrical cutoff switch when an abnormality is detected The configuration.

  According to the present invention, the maximum voltage of the capacitor system can be arbitrarily set by changing the number of modules interposed in the modular series circuit.

  By changing the number of modular series circuits arranged in parallel, the rated output and capacity of the capacitor system can be set arbitrarily.

  Since a large number of electric double layer capacitor cells are provided separately for each module, secondary failure can be prevented by cutting off the connection between the modules when, for example, a leakage occurs.

  Embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, a wind power generation facility includes a wind power generator 1 that generates power using wind power, and a power transmission path 3 that sends generated power output from the wind power generator 1 to a system power supply 2 via a power converter 6. The power storage device 5 is connected to the power transmission path 3 via the power converter 7.

  The power storage device 5 includes a capacitor system 10 including a predetermined number of electric double layer capacitor cells (refer to FIG. 2, hereinafter referred to as capacitor cells), and an AC / DC power converter 9 that charges and discharges the capacitor system 10. The means for detecting the output and output fluctuation of the wind power generator 1 and the output of the wind power generator 1 by controlling the operation of the power converter 9 in conjunction with the converter controller 53 (see FIG. 3) according to the detected value. And a system controller 50 (see FIGS. 3, 4, and 15) that suppresses fluctuations.

  In the electric double layer capacitor cell 12 shown in FIG. 2A, a laminate of a plurality of positive electrodes, negative electrodes and separators (not shown) is housed in a bag-like soft case 13 together with an electrolyte.

  The plurality of capacitor cells 12 are stored in a line in a hard case (not shown). Heat generated in the capacitor cell 12 as charging and discharging are conducted is transmitted from the soft case 13 to the hard case, and is released from the hard case to the outside air.

  As shown in FIG. 2B, the module 11 is housed in a housing 14 so that the hard cases of the capacitor cells 12 are arranged in three rows, and a capacitor controller 39 is provided above the capacitor cells 12. It is done.

  As shown in FIG. 5, the capacitor controller 39 shown in FIG. 2C includes a module circuit 42 that connects each terminal 16 of each capacitor cell 12 in series, a resistor 44 and each terminal 16 of each capacitor cell 12. And a bypass circuit 45 that is short-circuited via the switching element 43.

  The circuit configuration of the capacitor controller 39 will be described in detail. Each capacitor cell 12 (1 to n) is provided with a bypass circuit 45 in parallel. The bypass circuit 45 includes a current limiting resistor 44 and a switching element 43, and includes an OR circuit 46 that turns the switching element 43 on and off. Based on the input from the comparator 47 and the input from the bypass switching circuit 49, the OR circuit 46 turns on the switching element 43 (bypass operation) when at least one of these inputs becomes a high level signal (bypass command). Output a signal. When the base voltage is applied by the ON signal of the OR circuit 46, the switching element 43 closes the bypass circuit 45. On the other hand, when the application of the base voltage is canceled by the OFF signal of the OR circuit 46, the switching element 43 45 is opened.

  The comparator 47 outputs a bypass command for initializing the module 11 to the maximum voltage, and the terminal voltage (cell voltage) of each capacitor cell 12 (1 to n) is a reference corresponding to the maximum voltage of the module 11. When the terminal voltage of each capacitor cell 12 (1 to n) exceeds the reference voltage as compared with the voltage (set in the generator 48), a bypass command is output to the OR circuit 46. The bypass switching circuit 49 outputs a bypass command for arbitrarily correcting (equalizing) the variation in the shared voltage of each capacitor cell 12 (1 to n), and the OR circuit of the capacitor cell 12 that needs to be bypassed. A bypass command is output to 46.

  The voltage detection switching circuit 30 sequentially detects these shared voltages (cell voltages) for the capacitor cells 12 (1 to n). The detection signal is isolated from the main circuit power supply by the isolation amplifier 31, and AD The data is input to the CPU 33 via the converter 32. The CPU 33 exchanges various necessary information via the signal line 51 and uses it for the control data stored in the RAM 34, while performing the following control based on the program stored in the ROM 35 ( The bypass determination of the capacitor cell 12 or the like is executed.

  Based on the determination of the CPU 33, the capacitor cell 12 that needs to be bypassed is designated from the target cell switching processing circuit 36 to the bypass switching circuit 49. The processing circuit 36 also has a function of specifying a detection target capacitor cell for the voltage detection switching circuit 30.

  As an equalization control means, the capacitor controller 39 controls the on / off of the bypass circuit 45 (charge current bypass) of each capacitor cell 12 so as to equalize the terminal voltage of each capacitor cell 12 in cooperation with the system controller 50. It has become.

  The withstand voltage of the module 11 is determined according to the characteristics of the insulating material provided in each capacitor cell 12, but the capacitor accommodated in one module 11 so that the maximum output voltage of the module 11 can be suppressed below a predetermined withstand voltage. The number of cells 12 is set. In the present embodiment, by setting the number of capacitor cells 12 to about 100, the maximum output voltage of the module 11 is set to 200 to 250 V or less to ensure a withstand voltage.

  The casing 14 of each module 11 is installed in the main body of the capacitor system 10 via an insulating material (not shown), and ensures electrical safety.

  A ground line (not shown) extending from each module 11 is connected to the ground via a resistor, and even if a short-circuit current flows to each ground wire via a resistor or the like, a potential difference is generated between the modules 11. A high voltage short circuit is prevented.

  The power converter 9 converts the AC power output from the wind power generator 1 in the charging mode into DC power and charges the capacitor system 10 while charging the DC power output from the capacitor system 10 in the discharging mode. It converts into electric power and outputs it to the system power supply 2.

  As shown in FIG. 3, the capacitor controller 39 provided in each capacitor controller 39 and the system controller 50 are connected via a signal line 51 to transmit / receive information between them. The system controller 50 is connected to a converter controller 53 that controls the operation of the power converter 9 via a signal line 52, and transmits and receives information between them.

  FIG. 15 is a configuration diagram of the power storage device 5 including the system controller 50. The total voltage of the capacitor system 10 generated in the input / output circuit 24 is measured by the measurement box 61, the total current flowing through the input / output circuit 24 is measured by the DC current sensor 62, and these data are sent from the measurement box 61 to the system controller 50. It is done. The system controller 50 sends a signal indicating the total current flowing through the input / output circuit 24, a signal indicating the temperature of the capacitor cell 12, and a status signal indicating the operating state of the system controller 50 to the converter controller 53.

  The total voltage of the capacitor system 10 is measured by the measurement box 61 connected to the input / output circuit 24, and the system controller 50 controls the operation of the power converter 9 according to the measured value, thereby changing the output fluctuation of the wind power generator 1. It can be suppressed with good responsiveness.

  Further, the detected value of the terminal voltage of each capacitor cell 12 is added to calculate the total voltage of the capacitor system 10, and the calculated value is compared with the measured value of the total voltage measured by the measuring box 61. Based on the above, abnormality of the measurement box 61 and the capacitor controller 39 is diagnosed.

  The system controller 50 is provided with a total voltage indicator 55, an operation display lamp 56, a power supply control circuit 57, and the like.

  The converter controller 53 receives a power-on signal for turning on / off the power switch of the converter controller 53, a system connection signal for intermittently connecting the capacitor system 10 to the power converter 9, and a PWM converter status signal indicating the operating state of the converter controller 53. Output each.

  The capacitor system 10 includes a control bus signal for detecting a terminal voltage of each capacitor cell 12 to be described later, a signal for a temperature sensor for detecting the temperature of each capacitor cell 12, a signal for a leakage sensor for detecting leakage of the capacitor cell 12, and an electrical interruption. Contactor sense signals indicating the on / off of the switches 27 and 28 (see FIG. 3) are respectively output.

  The capacitor system 10 outputs a control bus signal that controls the terminal voltage of each capacitor cell 12 and a contactor drive signal that controls the on / off of the electrical cutoff switches 27 and 28.

  FIG. 16 is a configuration diagram of the module 11 including the capacitor controller 39. The capacitor controller 39 includes a terminal sensor voltage of each capacitor cell 12, a temperature sensor 65 that detects the temperature of each capacitor cell 12, the capacitor controller 39, and a leakage sensor 66 that detects a leakage of the capacitor cell 12.

  When the output fluctuation of the wind power generator 1 exceeds the specified value and the output of the wind power generator 1 exceeds the target level, the converter controller 53 switches the power converter 9 to the charging mode, and the difference power from the power transmission path 3. When the output of the wind power generator 1 falls below the target level, the power converter 9 switches to the discharge mode, and the difference power is supplied from the capacitor system 10 to the power transmission path 3. ing. Thereby, as shown in the characteristic diagram of the example in which the output power changes with respect to the elapsed time in FIG. 1, the fluctuation of the short cycle of the voltage accompanying the output fluctuation of the wind power generator 1 can be suppressed, and the output voltage is stabilized. Can be made.

  As shown in FIGS. 3 and 4, the capacitor system 10 includes a plurality of (for example, twelve) modules 11 in which a predetermined number (for example, 100) of electric double layer capacitor cells 12 are accommodated, and a predetermined number (for example, four) of modules. A predetermined number (for example, three) of modular series circuits 21 that connect 11 in series, and an input / output circuit 24 that connects each modular series circuit 21 to the power transmission path 3 in parallel via the power converter 7. .

  The number of modules 11 interposed in each modular series circuit 21 is set according to the maximum voltage required for the capacitor system 10. In the present embodiment, the maximum voltage of the capacitor system 10 is set in the range of 500 to 700 V by setting the number of modules 11 interposed in series to four.

  The number of modular series circuits 21 is set according to the rated output and capacity required for the capacitor system 10. In the present embodiment, by arranging three modular series circuits 21 in parallel, the rated output is secured at 100 kW or more and the capacity is secured at 1 kWh or more.

  Each modular series circuit 21 is provided with an electric cut-off switch 27 for cutting off the energization of each module 11 for each module 11. When the system controller 50 determines an abnormality such as when the leakage current of the capacitor cell 12 is detected, the system controller 50 opens each electrical cutoff switch 27 and performs control to cut off the energization of the module 11 to isolate the abnormal part in a small range. This prevents the secondary failure of the capacitor system 10.

  In the present embodiment, the capacitor system 10 includes an inter-module connection circuit 22 that connects each module series circuit 21 between the modules 11 in the same row. By providing this inter-module connection circuit 22, variations in voltage (charge rate) of each module 11 can be suppressed.

  In the present embodiment, an electric cut-off switch 28 is interposed in each inter-module connection circuit 22. When the system controller 50 determines an abnormal time such as when a leakage of the capacitor cell 12 is detected, the system controller 50 performs control to open each electrical cutoff switch 28 to prevent a secondary failure of the capacitor system 10. In addition, as shown in FIG. 4, it is also possible to abolish the electric cutoff switch 28 provided in each inter-module connection circuit 22.

  Each electrical cutoff switch 27, 28 is housed in a switch box (not shown), and each switch box is installed outside the housing 14 of the module 11. When exchanging the electric cut-off switch 27, it is not necessary to remove a cover or the like provided on the housing 14, and the switch box can be opened.

  Further, a fuse (not shown) is provided in parallel with each of the electric cut-off switches 27 and 28 to achieve fail-safe.

  In the present embodiment, since the three modules 11 arranged in the same row do not generate a voltage difference via the inter-module connection circuit 22, the system controller 50 performs aligned charge control to bring the voltages of the four rows of modules 11 closer to the target voltage. It is like that.

  Note that the inter-module connection circuit 22 can be eliminated. In that case, it is necessary for the system controller 50 to perform aligned charging control that brings the voltages of all (12) capacitor cells 12 close to the target voltage.

  The converter controller 53 performs output control (charge / discharge control) of the power converter 9 in a coordinated manner based on the received voltage and temperature information of each module 11. Further, when an abnormality such as leakage is detected, the system controller 50 sends an output stop request signal to the converter controller 53 to stop the operation of the capacitor power storage device 5. Further, when the system controller 50 detects an abnormality such as an electric leakage, a cut-off signal is sent to each of the electric cut-off switches 27 and 28 of each module 11 regardless of the operation / stop state, and the conduction between all the modules 11 is cut off. Prevent secondary failures.

  FIG. 6 is a control state transition diagram executed by the system controller 50. As shown in this figure, the step of determining the start-up control time when the system voltage of the input / output circuit 24 becomes less than a predetermined value (530 V) at the time of power-on when the power switch of the capacitor power storage device 5 is turned on from the initial state of Step 1 (Startup control means) 2, step (initial charge control means) 7 for performing initial charging until the system voltage of the input / output circuit 24 becomes equal to or higher than a predetermined value (530 V) during the start-up control, and after the completion of the initial charge The step (alignment charge control means) 8 for controlling the on / off of the bypass circuit 45 so as to equalize the voltage of each capacitor cell 12 is provided, and after this alignment charge is performed, the process proceeds to step (normal control means) 3 Thus, the normal control is performed to suppress the short cycle cycle of the voltage due to the output fluctuation of the wind power generator 1.

  When the power switch of the capacitor power storage device 5 is turned off or when a stop command is issued from the converter controller 53, the routine proceeds to step 4 where shutdown control described later is performed and the initial state is restored.

  When a serious failure described later occurs, this is determined in step 5, and the process proceeds to step 4 where shutdown control is performed.

  If a minor failure described later occurs, this is determined in step 6 and if a predetermined time has elapsed, it is determined in step 5 that it is a serious failure, and the process proceeds to step 4 where shutdown control is performed.

  Next, a startup control routine executed by the system controller 50 will be described with reference to the flowchart of FIG.

  First, in step 11, the voltage between the modules 11 is confirmed.

  In subsequent step 12, it is determined whether or not there is a serious failure.

  If it is determined that there is a serious failure, the routine proceeds to step 13 and shifts to an abnormal control routine described later.

  On the other hand, if it is determined that there is no serious failure, the process proceeds to step 14 to close each of the electrical cutoff switches 27 and 28, and in the subsequent step 15, the start completion status is output. At this time, the module 11 whose voltage is equal to or higher than a predetermined value opens the electrical cutoff switches 27 and 28.

  In subsequent step 16, it is determined whether or not there is a response from the converter controller 53. When there is a response from the converter controller 53, this routine is terminated.

  Next, an alignment charge control routine executed by the system controller 50 will be described with reference to the flowchart of FIG.

  First, in step 21, it is determined whether or not the difference between the target voltage and the minimum cell voltage of each module 11 is greater than or equal to the first set value. If this difference is smaller than the first set value, this routine is terminated.

  On the other hand, if it is determined that the difference is greater than or equal to the first set value, the process proceeds to step 22 where the aligned charge flag is set, and in step 23, the aligned charge status is output to the converter controller 53 to perform aligned charge control. Is called.

  In subsequent step 24, it is determined whether or not the difference between the target voltage and the minimum cell voltage of each module 11 is equal to or smaller than the second set value. If it is determined that this difference is larger than the second set value, it is confirmed that the aligned charging flag is set, and the routine returns to step 24, where the aligned charging control is continued.

  On the other hand, if it is determined that the difference is equal to or smaller than the second set value, the process proceeds to step 25 to clear the aligned charging flag, and in step 26, the output of the aligned charging status to the converter controller 53 is stopped. End the routine.

  Next, a control routine for stabilization processing executed by the system controller 50 will be described with reference to the flowchart of FIG.

  First, at the step 81, the control start time of the stabilization process is determined, the process proceeds to a step 82, it is determined that the output fluctuation ΔP of the wind power generator 1 is not less than a specified value, and the process proceeds to a step 83 where a stabilization request is made. It is determined whether charging is performed (that is, whether the output P of the wind power generator 1 is equal to or higher than a target level).

  When the determination in step 83 is yes, the process proceeds to steps 84 and 85, the required charge amount (difference electric power where the output P of the wind power generator 1 exceeds the target level) is obtained, and the power converter 9 is switched to the charge mode. The necessary power is supplied from the power transmission path 3 to the capacitor system 10.

  On the other hand, when the determination in step 83 is no, the process proceeds to steps 86 and 87, the required discharge amount (difference electric power where the output P of the wind power generator 1 falls below the target level) is obtained, and the power converter 9 is set in the discharge mode. The necessary power is supplied from the capacitor system 10 to the power transmission path 3.

  In subsequent step 88, when it is determined that the output fluctuation ΔP of the wind power generator 1 is equal to or less than the specified value, this routine is terminated, and the normal control is started.

  Next, the equalization control routine executed by the system controller 50 will be described with reference to the flowchart of FIG.

  First, in step 31, it is determined whether or not the difference between the target voltage and the cell minimum voltage of each capacitor cell 12 is equal to or greater than a first set value. If this difference is smaller than the first set value, this routine is terminated.

  On the other hand, if it is determined that this difference is greater than or equal to the first set value, the process proceeds to step 32 to set the equalization processing flag.

  In the following step 33, it is determined whether or not the battery is in the charged state. Equalization control is performed in the charged state, and the equalization control is stopped if not in the charged state.

  In subsequent step 36, it is determined whether or not the difference between the target voltage and the cell minimum voltage of each capacitor cell 12 is equal to or smaller than the second set value. If it is determined that this difference is greater than the second set value, it is confirmed that the equalization flag has been set, the process returns to step 33 via step 37, and equalization control is continued.

  On the other hand, if it is determined that this difference is equal to or smaller than the second set value or that it is determined in step 37 that the specified time has elapsed, the process proceeds to step 38 to clear the equalization flag, and this routine is terminated. Transition to normal control.

  Next, an abnormality detection control routine executed by the system controller 50 will be described with reference to the flowchart of FIG.

  First, at step 41, it is determined whether or not the contactor contact signals of the relay type electric cutoff switches 27 and 28 are normal.

  If it is determined that there is an abnormality in each of the electrical cut-off switches 27 and 28, the process proceeds to step 46, a serious failure determination flag is output, and the process proceeds to an abnormality control routine described later.

  On the other hand, if it is determined that all of the electrical cut-off switches 27 and 28 are normal, the process proceeds to the next step 42 to check whether or not a leakage has occurred in each module 11 based on the signal of the leakage (EL) sensor. judge.

  If it is determined that any of the modules 11 is leaking, the process proceeds to step 46 to output a serious failure determination flag, and the routine proceeds to an abnormal control routine.

  On the other hand, if it is determined that no leakage has occurred in all the modules 11, the process proceeds to the next step 43 to determine whether or not the response from the converter controller 53 is normal.

  If it is determined that there is an abnormality in the response from the converter controller 53, the process proceeds to step 46, a serious failure determination flag is output, and the routine proceeds to an abnormality control routine.

  On the other hand, when it is determined that the response from the converter controller 53 is normal, the process proceeds to the next step 44 to determine whether or not the temperature of the capacitor cell 12 in each module 11 is normal or lower.

  If it is determined that there is an abnormality in which the temperature of the capacitor cell 12 is higher than the predetermined value, the process proceeds to step 45, a light failure determination flag is output, and the routine proceeds to an abnormality control routine.

  On the other hand, when it is determined that the temperature of the capacitor cell 12 is in a normal state lower than the predetermined value, that is, when there is no abnormality in all of steps 41 to 44, this routine is terminated.

  Next, a control routine for a minor failure executed by the system controller 50 will be described with reference to the flowchart of FIG.

  First, in step 51, the converter controller 53 is commanded to limit the output. In this way, charging / discharging of each capacitor cell 12 is suppressed, and a temperature decrease of each capacitor cell 12 is promoted.

  Proceeding to step 52, if the determination of a minor failure continues while the specified time elapses, the routine proceeds to a control routine for a major failure.

  Next, a control routine at the time of a serious failure executed by the system controller 50 will be described with reference to the flowchart of FIG.

  First, in step 61, an operation stop request is commanded to the converter controller 53.

  In the following step 62, it is determined whether or not there is a response from the converter controller 53.

  If there is a response from the converter controller 53, the process proceeds to step 63 to shift to a shutdown control routine.

  On the other hand, if there is no response from the converter controller 53, the routine proceeds to step 64, and if there is no response from the converter controller 53 while the specified time has elapsed, the routine proceeds to a shutdown control routine.

  Next, a shutdown control routine executed by the system controller 50 will be described with reference to the flowchart of FIG.

  First, in step 71, all the electric cutoff switches 27 and 28 are opened. Thereby, each module 11 is interrupted | blocked and a secondary failure is prevented.

  In subsequent step 72, parameters such as a fault code are stored. If it is determined in step 73 that the storage of the parameter has been completed, the routine proceeds to step 74 where the power switch of the capacitor power storage device 5 is turned OFF, and this routine is terminated.

  As described above, the capacitor system 10 includes a plurality of (for example, twelve) modules 11 in which a predetermined number (for example, 100) of electric double layer capacitor cells 12 are accommodated and a predetermined number (for example, four) of modules 11 in series. A predetermined number (for example, three) of modular series circuits 21 connected to the I / O circuit 24, an input / output circuit 24 that connects each modular series circuit 21 in parallel to the power transmission path 3 via the power converter 7, and each modular series circuit. And an electric cut-off switch 27 for intermittently connecting 21 between the modules 11.

  By changing the number of modules 11 interposed in each modular series circuit 21, the maximum voltage of the capacitor system 10 can be arbitrarily set.

  By changing the number of modular series circuits 21 arranged in parallel, the rated output and capacity of the capacitor system 10 can be arbitrarily set.

  For example, by opening each electric cut-off switch 27 when each capacitor cell 12 is leaked, the connections between the modules 11 interposed in the modular series circuit 21 are cut off from each other, preventing secondary failure of the capacitor system 10. can do.

  For example, when each capacitor cell 12 is leaked, each electrical cutoff switch 28 is opened, so that the connections between the modules 11 interposed in the inter-module connection circuit 22 are cut off from each other. Failure can be prevented.

  As an equalization control means, the terminal voltage of each capacitor cell 12 is equalized without using an external charging facility by controlling the on / off of the bypass circuit 45 of each capacitor cell 12 (bypass of charging current). Can do.

  The capacitor power storage device 5 determines the start control time when the system voltage of the input / output circuit 24 becomes less than a predetermined value (530V) when the power is turned on, and sets the system voltage of the input / output circuit 24 to a predetermined value (530V) at the start control. ) Initial charging is performed until the above is reached, and after completion of the initial charging, aligned charging control for controlling the on / off of the bypass circuit 45 is performed so as to equalize the voltages of the capacitor cells 12.

  FIGS. 17A and 17B show examples in which the system voltage and the voltage of each module 11 change when initial charging control and aligned charging are performed. As shown in FIG. 17 (a), when the capacitor power storage device 5 stops operating and the capacitor cells 12 are discharged due to the discharge of the capacitor cells 12, the voltage of the capacitor cells 12 varies as shown in FIG. 17 (b). Even if the initial charge control is performed until the system voltage becomes equal to or higher than the predetermined value (530 V), the variation in the voltage of each capacitor cell 12 is not eliminated, but the voltage of each module 11 is set to the predetermined value (by the aligned charging). 0.2V).

  Thus, initial charging and alignment charging are automatically performed when the power of the capacitor power storage device 5 is turned on, thereby suppressing deterioration of each capacitor cell 12 due to voltage variation of each capacitor cell 12 during normal control, and for a long time. Performance can be maintained over the

  In addition, when it is determined that the system voltage is equal to or higher than a predetermined value (530 V) when the power is turned on, the initial charging and the aligned charging control cannot be performed, but only the aligned charging control may be performed as necessary.

  Even during normal control, initial charging and alignment charging can be performed as necessary for maintenance or the like.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  The power storage device of the present invention is not limited to wind power generation facilities and solar power generation facilities, and can be used for, for example, power storage devices for hybrid trains, power storage devices for hybrid industrial vehicles, other emergency power supply devices, and the like.

The block diagram of the wind power generation equipment which shows embodiment of this invention. The block diagram of a capacitor system similarly. The block diagram of an electric power storage apparatus similarly. The block diagram of an electric power storage apparatus similarly. The circuit diagram of a capacitor control board similarly. Similarly, a control state transition diagram. The flowchart which similarly shows the routine of starting control. The flowchart which similarly shows the routine of aligned charge control. The flowchart which similarly shows the control routine of a stabilization process. The flowchart which similarly shows the routine of equalization control. The flowchart which similarly shows the routine of abnormality detection control. The flowchart which similarly shows the control routine at the time of a minor failure. The flowchart which similarly shows the control routine at the time of a serious failure. The flowchart which similarly shows the control routine of shutdown. The block diagram of an electric power storage apparatus similarly. The block diagram of a capacitor controller similarly. The diagram which shows a mode when initial charge control and alignment charge are performed similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wind power generator 2 System power supply 3 Power transmission path 5 Power storage device 9 Power converter 10 Capacitor system 11 Module 12 Capacitor cell 21 Modular series circuit 22 Inter-module connection circuit 24 Input / output circuit 27 Electrical cutoff switch 28 Electrical cutoff switch 39 Capacitor controller 40 Module circuit 45 Bypass circuit 50 System controller

Claims (6)

In a power storage device that is connected to a power transmission path and performs charging and discharging,
A plurality of modules containing a plurality of electric double layer capacitor cells;
A plurality of modular series circuits that connect the modules in series;
An electric power storage device comprising: an input / output circuit that connects each of the modular series circuits in parallel to the power transmission path via a power converter. An electric cut-off switch for intermittently connecting each module series circuit between the modules;
2. The power storage device according to claim 1, wherein each of the electrical cutoff switches is opened at least when an abnormality is detected in which leakage of the electric double layer capacitor cell is detected.   The power storage device according to claim 1 or 2, further comprising an inter-module connection circuit that connects the modules in series. An electrical cut-off switch for intermittently connecting the modules between the modules;
4. The power storage device according to claim 3, wherein each of the electric cutoff switches is opened at least when an abnormality is detected in which leakage of the electric double layer capacitor cell is detected. The module is a module circuit that connects each terminal of each electric double layer capacitor cell in series;
A bypass circuit for short-circuiting each terminal of each electric double layer capacitor cell;
The equalization control means which controls the interruption of this bypass circuit so that the terminal voltage of each said electric double layer capacitor cell may be equalized is provided, The any one of Claim 1 to 4 characterized by the above-mentioned. Power storage device. Start control means for determining the start control time when the power of the power storage device is turned on;
Initial charge control means for performing initial charge until the system voltage of the input / output circuit becomes a predetermined value or higher during the start-up control;
6. The apparatus according to claim 5, further comprising aligned charge control means for controlling on / off of the bypass circuit so as to equalize the voltages of the respective electric double layer capacitor cells after the completion of the initial charging. Power storage device.