JP5468580B2 - Storage battery charge control device and charge control method - Google Patents

Description

  The present invention relates to a storage battery charge control device and a charge control method for controlling charging of a storage battery.

  A substation usually includes a control DC power supply device that outputs a DC power supply, and a circuit breaker or the like is moved by the DC power supply from this device. In addition, when the substation itself fails, the control DC power supply device becomes inoperative, so a lead storage battery is connected in parallel with the control DC power supply device.

  By the way, when a large load current is supplied from a substation control DC power supply for turning on a circuit breaker or the like, the control DC power supply is increased due to an increase in internal resistance due to deterioration of storage batteries connected in parallel. The output voltage has dropped and devices such as circuit breakers do not operate normally. That is, when the lead storage battery continues to be insufficiently charged, a phenomenon called “sulfation” occurs in the lead storage battery, in which sulfate produced in the negative electrode at the time of discharge crystallizes on the electrode surface and does not return to its original state. This phenomenon increases and degrades the internal resistance of the lead acid battery.

  As a DC power supply for controlling a substation, a thyristor rectifier for floating charging is used. Such a control DC power supply is normally operated by floating charging, and includes a circuit for automatically and equally charging once every several months. Floating charging is for keeping the lead-acid battery in a fully charged state, and charging the lead-acid battery with a specified voltage. The equal charge is for eliminating variations in the voltage of each cell forming the lead storage battery, and the lead storage battery is charged with a voltage higher than the voltage of the floating charge.

  In order to suppress sulfation, there is a lead storage battery control device that performs optimum charge control by detecting the remaining battery capacity (see, for example, Patent Document 1). However, in the substation, when the equipment is frequently operated due to the construction work, it is manually charged evenly within the day to suppress the deterioration of the sulfation.

JP 2008-147005 A

  Substations can be charged evenly when necessary during construction work. However, there are unmanned substations, and even if accident interruptions due to lightning or the like occur frequently in a short time, the equal charge operation for the lead storage battery is not performed. As a result, the state of insufficient charge of the lead storage battery continues, and sulfation degradation proceeds.

  In addition, the lead storage battery control device described above performs optimum charge control by detecting the remaining battery capacity and suppresses sulfation, but the remaining capacity is the same as the pre-charge voltage when the car is stopped, Is calculated from the charging voltage and charging current. For this reason, it is difficult to apply this apparatus to facilities that are continuously operated with floating charging at all times, such as unmanned substations.

  The object of the present invention is to solve the above-mentioned problems and to provide a storage battery charge control device and a charge control method that make it possible to reliably charge the lead storage battery evenly when the lead storage battery is insufficiently charged. There is.

In order to solve the above problems, the invention of claim 1 comprises a DC power supply device that outputs a DC power supply to a plurality of circuit breakers and switches, and a storage battery connected in parallel to the DC power supply device. In a charging control device for a storage battery of a power supply device, the measuring device has a current measuring unit and a voltage measuring unit, and monitors a DC voltage and a DC current of a DC power source output from the DC power source device, and an operation of the DC power source device When the DC power supply device is in a non-operating state, the controller checks the operating frequency of the circuit breaker and the switch from the state of the DC power supply supplied to the device. If there is a change in the DC voltage and DC current of the DC power source output from the DC power supply device, the waveform of the DC current stored in advance in the storage unit is compared with the waveform of the measurement current from the current measurement unit. And determines whether the circuit breaker and the switch is operated, the control device, based on the measurement result from the measuring device, when the operation frequency of the circuit breaker and the switch is a frequent operation When it is determined, the amount of discharge due to the frequent operation is checked, and when the frequent operation ends, the time for performing equal charge is calculated based on the amount of discharge, and the equal charge is performed at the calculated time. It is a charge control apparatus of the storage battery.

  The invention of claim 1 relates to a storage battery charge control device of a power supply device comprising a DC power supply device that outputs a DC power supply to a device and a storage battery connected in parallel to the DC power supply device. Then, the control device of this charging control device checks the operating state of the DC power supply device, and monitors the operating frequency of the device from the state of the DC power supply supplied to the device when the DC power supply device becomes inoperative. Further, when the operation frequency is a frequent operation, the control device examines the discharge amount due to the frequent operation, and when the frequent operation ends, calculates the time for performing equal charge based on the discharge amount, and calculates the calculated time. Charge evenly.

  According to a second aspect of the present invention, in the charge control device for a storage battery according to the first aspect, before the frequent operation ends, the control device sets a discharge amount due to the frequent operation to a preset value. If it exceeds, the time for performing the equal charge is calculated based on the discharge amount, and the equal charge is performed for the calculated time.

According to a third aspect of the present invention, there is provided a charge control method for a storage battery of a power supply device comprising: a DC power supply device that outputs a DC power supply to a plurality of circuit breakers and switches; and a storage battery connected in parallel to the DC power supply device. The DC voltage and DC current of the DC power supply output from the DC power supply device are monitored by a measuring device having a current measurement unit and a voltage measurement unit, and the control device checks the operating state of the DC power supply device, and the DC power supply When the device is inoperative, the operation frequency of the circuit breaker and switch from the state of the DC power supplied to the circuit breaker and the switch controller monitors the measurement device from the DC power supply device When there is a change in the DC voltage and DC current of the output DC power source, the waveform of the DC current stored in advance in the storage unit is compared with the waveform of the measurement current from the current measurement unit , It is determined whether the breakers and switches is operated, the control device, based on the measurement result from the measuring device, the operating frequency of the circuit breaker and the switch is determined to be a frequent operation In this case, the discharge amount due to the frequent operation is checked, and when the frequent operation ends, the time for performing the uniform charge is calculated based on the discharge amount, and the uniform charge is performed at the calculated time. It is a charge control method of a storage battery.

  According to the first and third aspects of the present invention, when the DC power supply device becomes inoperable due to a power failure, for example, when a frequent operation of the device occurs, the time is calculated based on the discharge amount of the storage battery. Since charging is performed, deterioration of the sulfation of the storage battery can be suppressed. Moreover, the malfunction of a connection apparatus by deterioration of a storage battery can be avoided.

  According to the invention of claim 2, when the discharge amount of the storage battery is large, the storage battery can be immediately charged equally.

It is a block diagram which shows the charge control apparatus of the storage battery by one embodiment of this invention. It is a block diagram which shows an example of a measuring device. It is a flowchart which shows an example of a charge control process. It is explanatory drawing explaining frequent operation. It is explanatory drawing explaining the operating current of a circuit breaker.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a storage battery charge control device (hereinafter simply referred to as “charge control device”) according to this embodiment. This charging control device is applied to a power supply device. The power supply device includes a DC power supply device 1 and a lead storage battery 2, and outputs a DC power supply to the load 3. The charge control device applied to such a power supply device controls charging of the lead storage battery 2 and includes a measuring device 4 and a controller 5.

  The power supply device outputs a DC power supply to the load 3. The load 3 is various devices. In this embodiment, the load 3 includes a plurality of circuit breakers 3A and a plurality of switches 3B installed in the substation. Each circuit breaker 3 </ b> A and each switch 3 </ b> B are operable by a DC power source from a power supply device.

  The DC power supply device 1 of the power supply device normally supplies a DC power supply with a specified voltage to each circuit breaker 3A and each switch 3B of the load 3 through the power supply line 11 under the control of the controller 5. At the same time, a DC power supply with a specified voltage is supplied to the lead storage battery 2 via the power supply line 11. As a result, the DC power supply 1 always performs floating charging on the lead storage battery 2. In addition, the DC power supply 1 outputs a DC power supply having a voltage higher than that of the floating charge under the control of the controller 5. This DC power supply is supplied to the lead storage battery 2 at the same time as being supplied to the load 3. As a result, the DC power supply device 1 performs equal charge on the lead storage battery 2. The equal charge is performed in order to eliminate variations in voltage and the like of each cell forming the lead storage battery 2.

  The lead storage battery 2 of the power supply device is connected in parallel to the output side of the DC power supply device 1. The lead storage battery 2 is formed of a plurality of cells. The output of the cell is a predetermined voltage, and the lead storage battery 2 outputs a specified voltage depending on the combination of the cells. That is, when the DC power supply 1 becomes inoperative when the substation itself fails, and the DC power supply with the specified voltage is not output to the load 3, the lead storage battery 2 replaces the DC power supply 1 with the specified voltage. Is supplied to the load 3.

  The measuring device 4 monitors a DC power source, that is, a DC voltage or a DC current output from the DC power source device 1. The measuring device 4 checks the operation of the circuit breaker 3A and the switch 3B from the change of the DC voltage and the waveform of the DC current when the DC voltage changes. For this purpose, as shown in FIG. 2, the measurement device 4 includes a current measurement unit 4A, a voltage measurement unit 4B, an interface 4C, a processing unit 4D, and a storage unit 4E.

  The current measuring unit 4A of the measuring device 4 measures the magnitude of the direct current when the circuit breaker 3A and the switch 3B are operated, and the voltage measuring unit 4B measures the magnitude of the DC voltage at that time. The interface 4C converts an analog measurement value from the current measurement unit 4A or the voltage measurement unit 4B into a digital measurement value. When the processing unit 4D receives the measurement current from the current measurement unit 4A and the measurement voltage from the voltage measurement unit 4B via the interface 4C, the processing unit 4D stores these values in the storage unit 4E. Thereby, the waveform of the measurement current and the like are stored in the storage unit 4E.

  Then, when there is a change in the DC voltage or DC current from the DC power supply device 1 currently monitored, the processing unit 4D stores the waveform of the DC current stored in advance in the storage unit 4E and the storage unit 4E. The waveform of the measured current from the current measuring unit 4A is compared, and it is determined whether or not the circuit breaker 3A or the switch 3B has been operated. If the processing unit 4D determines that the circuit breaker 3A or the switch 3B is operated, the processing unit 4D outputs a digital measurement result indicating that these devices are operated to the controller 5. This measurement result includes a signal indicating that the circuit breaker 3A and the switch 3B are operated, and a waveform indicating a change in the direct current at that time.

  Such a measuring device 4 normally operates with a DC power supply device 1 and operates with a DC power supply from the lead storage battery 2 in the event of a power failure in a substation situation.

  The controller 5 controls the DC power output from the DC power supply device 1 based on the measurement result from the measuring device 4. For this purpose, the controller 5 includes an interface 5A, an input unit 5B, an output unit 5C, a processing unit 5D, and a storage unit 5E. Like the measuring device 4, such a controller 5 normally operates with the DC power supply device 1, and operates with a DC power source from the lead storage battery 2 in the event of a power outage in a substation situation.

  The interface 5A of the controller 5 is used to connect the DC power supply device 1 via the signal line 12 and the measurement device 4 via the signal line 13, and the signal 5 from the DC power supply device 1 and the measurement device 4 is connected. Convert levels etc. The input unit 5B is an input device such as a key switch. By operating the input unit 5B, for example, an instruction for equal charge is manually input. The output unit 5 </ b> C includes a display device that represents an operation state of the controller 5. For example, when an instruction for equal charge is input to the input unit 5B, the output unit 5C performs a display indicating that equal charge is currently being performed.

  The storage unit 5E is a storage device that stores various data. Further, the storage unit 5E stores in advance a program necessary for the processing of the controller 5.

  The processing unit 5D executes a program stored in the storage unit 5E. The program executed by the processing unit 5D includes a charging control process. The processing unit 5D monitors the operating state of the DC power supply device 1 by transmitting and receiving signals to and from the DC power supply device 1 via the interface 5A and the signal line 12. And processing part 5D will start charge control processing shown in Drawing 3, if non-operation of direct-current power supply device 1 by a power failure of substation itself is detected.

  Hereinafter, the charge control process by the processing unit 5D will be described, and the charge control method which is the operation of this embodiment will be described together. When the charging control process is started, the processing unit 5D monitors the frequency (operation frequency) at which the circuit breaker 3A and the switch 3B operate from the measurement result from the measurement device 4 (step S1), and the operation frequency frequently occurs. It is determined whether the state is a frequent operation state (step S2).

  In step S2, the processing unit 5D determines whether the operation is a frequent operation as follows. The processing unit 5D stores the measurement result from the measurement device 4 in the storage unit 5E for a predetermined time. Then, the processing unit 5D operates the circuit breaker 3A and the switch 3B more than a preset number of times based on each measurement result stored in the storage unit 5E, and within a preset set time. It is determined that the circuit breaker 3A and the switch 3B are in a state of frequent operation. For example, when the set number of times is N and the set time is T0 time, as shown in FIG. 4, after the A circuit breaker operates, the B circuit breaker operates after the T1 time, and further after the T2 time C Each device operates such that the disconnect switch operates. In this case, if the time T1 to T3 is within the set time T0, and the number of operations of each device is 4 times or more of the set number of times, the processing unit 5D Judge that the device is operating frequently.

  If the operation is not frequent in step S2, the processing unit 5D returns the process to step S1. If it is determined in step S2 that the operation is frequent, the processing unit 5D calculates the start point of the frequent operation of the circuit breaker 3A or the switch 3B. In step S3, the processing unit 5D determines the first operation as the start point of the frequent operation in the series of operations of the circuit breaker 3A and the switch 3B that is determined as the frequent operation. For example, as shown in FIG. 4 above, when it is determined that the operation of four devices from the A breaker to the B disconnector is a frequent operation, the processing unit 5D first sets the t1 time when the A breaker is first operated. Calculated as the start time of the frequency operation.

  When step S3 ends, the processing unit 5D integrates the discharge amount of the lead storage battery 2 due to the frequent operation (step S4). The processing unit 5D performs step S4 as follows. When the circuit breaker 3A and the switch 3B operate, for example, as shown in FIG. 5, when the circuit breaker 3A operates, a large load current flows. That is, the processing unit 5D uses the waveform of the direct current included in the measurement result from the measurement device 4 to change the operating current of the circuit breaker 3A from the time when the circuit breaker 3A operates, that is, from time t11 to time t12. Accumulate for. This integrated value is the same as the integrated value of the discharge amount of the lead storage battery 2. In step S4, the processing unit 5D stores the calculated discharge amount in the storage unit 5E.

  When such step S4 ends, the processing unit 5D determines whether or not the discharge amount stored in the storage unit 5E is equal to or greater than a set value (step S5). The set value of the discharge amount is a value input in advance from the input unit 5B by the person in charge. The set value of the discharge amount represents the level of the discharge amount that needs to be charged immediately when the discharge amount of the lead storage battery 2 is large. The processing unit 5D stores the input set value of the discharge amount in the storage unit 5E. By this step S5, as will be described later, when the discharge amount of the lead storage battery 2 is large, equal charge can be immediately performed.

  If the discharge amount is less than the set value in step S5, the processing unit 5D next determines whether or not the frequent operation has ended (step S6). The processing unit 5D performs step S6 as follows. The processing unit 5D is configured to operate the circuit breaker or disconnector even when the set time T0 has elapsed since the last operation of the circuit breaker 3A or the switch 3B, for example, in FIG. When the above operation does not occur, it is determined that the frequent operation has ended. Conversely, if the circuit breaker or disconnector operates within the time T0, the processing unit 5D determines that it is in a state of frequent operation.

  If the frequent operation has not ended in step S6, the processing unit 5D returns the process to step S4. Thereby, all the discharge amount by frequent operation | movement is preserve | saved at the memory | storage part 5E.

  If it is determined in step S6 that the frequent operation has ended, or if it is determined in step S5 that the discharge amount is greater than or equal to the set value, the processing unit 5D checks the operating state of the DC power supply device 1 (step S7). In step S7, as described above, the processing unit 5D monitors the operating state of the DC power supply device 1 by transmitting and receiving signals to and from the DC power supply device 1 via the interface 5A and the signal line 12. Thereafter, the processing unit 5D determines whether or not the DC power supply device 1 is in an operating state from the monitoring result (step S8). If the DC power supply device 1 is not operating in step S8, the processing unit 5D returns the process to step S7.

  If it is determined in step S8 that the DC power supply device 1 is in the operating state, the processing unit 5D calculates the time for performing uniform charging from all the discharge amounts stored in the storage unit 5E (step S9). The equal charging time calculated in step S9 is for supplementing the discharge amount of the lead storage battery 2 by frequent operation and for suppressing the sulfation of the lead storage battery 2.

  Thereafter, the processing unit 5D sends an instruction for charging with the equal charging time calculated in step S9 to the DC power supply device 1 through the signal line 12 to perform equal charging (step S10), and checks the time to determine the equal charging time. It is determined whether or not it has elapsed (step S11). If the equal charging time has not elapsed, the processing unit 5D returns the process to step S10. When the processing unit 5D determines that the equal charge time has elapsed in step S11, the processing unit 5D sends an instruction to end the equal charge to the DC power supply device 1 via the signal line 12 to end the equal charge (step S12), and the charge control process Exit.

  When the charging control process is finished, the DC power supply device 1 is in a normal state and outputs a DC power supply with a specified voltage to the load 3. At the same time, since this DC power supply is applied to the lead storage battery 2, the lead storage battery 2 is always subjected to floating charging.

  Thus, according to this embodiment, the following effects can be achieved. If the substation itself has a power outage due to lightning, etc., and the circuit breaker 3A or switch 3B is operated frequently, it will be charged evenly in the time calculated based on the discharge amount of the lead storage battery 2. Deterioration of the lead storage battery 2 can be suppressed. Moreover, the malfunction of the connection apparatus by deterioration of the lead storage battery 2 can be avoided.

(Embodiment 2)
In this embodiment, the measuring device 4 is as follows. In this embodiment, components that are the same as or the same as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, the measuring device 4 includes only a current measuring unit 4A and a voltage measuring unit 4B.

  And in this embodiment, the memory | storage part 5E of the controller 5 has memorize | stored beforehand the waveform of the direct current when the circuit breaker 3A and the switch 3B operate | move. The processing unit 5D receives a signal from each current measuring unit 4A or voltage measuring unit 4B of the measuring device 4 and stores in advance if there is a change in the DC voltage or DC current from the DC power supply device 1 currently monitored. The waveform of the direct current stored in the unit 5E is compared with the waveform obtained from the change in the direct current received from the current measuring unit 4A, and it is determined whether the circuit breaker 3A or the switch 3B has been operated.

  According to such an embodiment, since the measuring device 4 installed between the DC power supply device 1 and the load 3 includes the current measuring unit 4A and the voltage measuring unit 4B, the measuring device 4 is reduced in size and handled. Makes it easy to do.

DESCRIPTION OF SYMBOLS 1 DC power supply device 2 Lead acid battery 3 Load 3A Circuit breaker 3B Switch 4 Measuring device 5 Controller (control device)
5A interface 5B input unit 5C output unit 5D processing unit 5E storage unit

Claims (3)

In a storage battery charging control device of a power supply device comprising: a DC power supply device that outputs a DC power supply to a plurality of circuit breakers and switches; and a storage battery connected in parallel to the DC power supply device;
A measuring device having a current measuring unit and a voltage measuring unit, and monitoring a DC voltage and a DC current of a DC power source output from the DC power source device;
A control device is provided that checks the operating state of the DC power supply device and monitors the operating frequency of the circuit breaker and the switch from the state of the DC power supply supplied to the device when the DC power supply device is in an inoperative state.
When there is a change in the direct current voltage and direct current of the direct current power source output from the direct current power supply device, the measurement device has a waveform of the direct current stored in the storage unit in advance and the measurement current from the current measurement unit. Compare with the waveform, determine whether the circuit breaker and the switch operated,
Wherein the control device, based on the measurement result from the measuring device, the operating frequency of the circuit breaker and the switch is on when it is determined that the multi-frequency operation, examine the discharge amount due to frequent operation, multi frequency When the operation ends, the time for performing equal charge is calculated based on the discharge amount, and the equal charge is performed at the calculated time.
A charge control device for a storage battery. When the amount of discharge due to the frequent operation exceeds a preset value before the frequent operation ends, the control device calculates and calculates a time for performing equal charge based on the amount of discharge. Charge evenly during the time,
The charge control device for a storage battery according to claim 1. In a storage battery charge control method for a power supply device comprising: a DC power supply device that outputs a DC power supply to a plurality of circuit breakers and switches; and a storage battery connected in parallel to the DC power supply device.
By a measuring device having a current measuring unit and a voltage measuring unit, the DC voltage and DC current of the DC power source output from the DC power source device are monitored,
The control device examines the operating state of the DC power supply device,
Wherein the DC power supply device is inoperative, the operation frequency of the circuit breaker and switch from the state of the DC power supplied to the circuit breaker and the switch controller monitors,
When there is a change in the direct current voltage and direct current of the direct current power source output from the direct current power supply device, the measurement device has a waveform of the direct current stored in the storage unit in advance and the measurement current from the current measurement unit. Compare with the waveform, determine whether the circuit breaker and the switch operated,
Wherein the control device, based on the measurement result from the measuring device, the operating frequency of the circuit breaker and the switch is on when it is determined that the multi-frequency operation, examine the discharge amount due to frequent operation, multi frequency When the operation ends, the time for performing the equal charge based on the discharge amount is calculated, and the equal charge is performed at the calculated time.
A charge control method for a storage battery.

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