JP2006094612A - Individual operation preventing apparatus and individual operation preventing method of secondary battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an individual operation preventing apparatus and an individual operation preventing method of a secondary battery which surely detect an individual operation state of the secondary battery due to a system trouble, prevent an individual operation and have an economical advantage. <P>SOLUTION: The individual operation preventing apparatus is provided with a protection relay 11 for detecting the trouble on the power distribution system, a trip circuit for applying a trip signal to a circuit breaker on a power distribution line failed due to the trouble detected by the protection relay 11 and opening it, a distributed power supply selecting circuit 17 for selecting a distributed power supply individually operated based on trouble point information found from voltage and current information obtained in the power distribution system and location information of the secondary battery, a transmitter 13a for transmitting an operation stopping instruction to the selected distributed power supply, a transmitting circuit 14a for transmitting the operation stopping instruction to the distributed power supply, a receiver 15a provided on the distributed power supply side and receiving the operation stopping instruction transmitted through the transmitting circuit, and a distributed power supply stopping circuit 18 for operating a power receiving circuit breaker 7 provided at a link point of the distributed power supply by the received operation stopping instruction and stopping an operation of the distributed power supply. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a system for operating a secondary battery in connection with a power distribution system, when a part of the power distribution system including the secondary battery is disconnected from an upper system, the load on the power distribution system from the secondary battery. The present invention relates to an apparatus and a method for preventing an isolated operation of supplying power to a battery.

  Normally, in a power system that is connected to a distributed power supply such as a private power generation facility, there is a problem in terms of reliability and security for power supply if a single operation of the distributed power supply is continued in the event of a system failure. A single operation of the distributed power supply device is prevented by various methods (for example, Patent Document 1).

  Recently, with the introduction of a system that operates a secondary battery as a distributed power supply in the distribution system, prevention of isolated operation at the time of a system failure has been attempted for the distributed power supply.

  As a conventional method for detecting the independent operation of a secondary battery, a method of interrupting transfer or a method of monitoring voltage or frequency is implemented. These methods will be described with reference to FIGS.

  FIG. 4 is a system configuration diagram for explaining a conventional isolated operation detection method based on transfer interruption.

  In FIG. 4, a distribution substation bus 3 is connected to the upper power transmission system 1 via a distribution transformer 2, and a distribution line 5 is connected to the distribution substation bus 3 via a circuit breaker 4. . In general, a large number of loads 6 are connected to the distribution line 5, and a secondary battery 8 is connected via a power receiving circuit breaker 7.

  On the other hand, in the distribution substation, the voltage of the bus 3 is detected by the voltage transformer 9, the current flowing through each distribution line 5 is detected by the current transformer 10, and the detected voltage and current are input to the protection relay 11. When the protection relay 11 operates, a trip signal is output to the circuit breaker 4 via the trip circuit 12 by the output.

  The output of the trip circuit 12 is sent by the signal transmitter 13 via the dedicated line transmission circuit 14 to the signal receiver 15 provided on the secondary battery side, and the power receiving breaker 7 can also trip. It has a configuration like this.

  In such a configuration, when a short circuit accident or the like occurs in the distribution line 5, the protection relay 11 detects a voltage drop or an overcurrent based on the voltage and current detection signals input from the voltage transformer 9 and the current transformer 10. By providing the operation output to the trip circuit 12, a trip signal is output from the trip circuit 12 to the circuit breaker 4, and the circuit breaker 4 is opened to prevent the accident from continuing.

  On the other hand, the trip signal is sent from the signal transmitter 13 to the signal receiver 15 via the transmission circuit 14, and the power receiving circuit breaker 7 on the secondary battery side is also tripped. This prevents the secondary battery 7 connected to the distribution line 5 from being continuously operated in the event of an accident.

  FIG. 5 is a system configuration diagram for explaining a conventional method for detecting an isolated operation by monitoring voltage and frequency. Note that the configuration on the substation side is omitted.

  In FIG. 5, a distribution line 5 is connected to a distribution substation bus 3 via a circuit breaker 4, and power is supplied to a load 6 connected to the distribution line 5. Further, a secondary battery 8 is connected to the distribution line 5 via a power receiving breaker 7. Further, the voltage at the power receiving point of the secondary battery 8 is detected by the voltage transformer 9 a, and this detection signal is input to the isolated operation detection device 16. The islanding operation detection device 16 includes an over / under voltage relay and over / under frequency relay. When it is determined that the secondary battery 8 is in a single operation state from fluctuations in voltage or frequency, the trip signal is output to the power receiving circuit breaker 7. It becomes the composition given as.

  In such a configuration, when a system fault occurs in the distribution line 5 and the circuit breaker 4 is tripped by the operation of a protection relay (not shown), the output of the secondary battery 8 and the demand power of the load 6 are generally Since imbalance occurs between them, voltage and frequency fluctuations appear in the distribution line 5.

At this time, if the detection signal of the receiving point voltage detected by the voltage transformer 9a is input to the isolated operation detection device 16, the fluctuation of the system voltage and frequency is set to a stable value by the internal over / under voltage relay and over / under frequency relay. It detects that it exceeded, determines that it is in a single operation state, and outputs a trip signal to the circuit breaker 7 for power reception.
JP-A-8-19183

  However, in the former method for detecting the independent operation of the secondary battery by interrupting the transfer, it is necessary to use the transmission circuit 14 using a dedicated line for transmitting the transfer interrupt signal, which is expensive and the number of secondary batteries in the future will increase. When the number increases, it is economically disadvantageous to secure a large number of dedicated lines or to secure an expensive large-capacity dedicated line.

  In general, distribution circuit breakers are installed only at the delivery point of the distribution line, and actual accidents often occur at the end of the distribution line. Despite being limited to the vicinity of the end, there is a possibility that a secondary battery outside the power outage section of the same distribution line is tripped more than necessary.

  Further, in the latter method for detecting the independent operation of the secondary battery by monitoring the voltage and frequency, when the isolated operation occurs in a state where the demand power of the load 6 and the output of the secondary battery 8 are balanced, the distribution line 5 Since there is no change in voltage and frequency, there is a problem that it is difficult to detect this.

  On the other hand, the isolated operation detection method called the active method is used to detect the isolated operation of the secondary battery by constantly changing the output of the secondary battery and observing the voltage and frequency appearing on the distribution line in that state. Although there are some methods, the detection accuracy is improved, but if a large number of secondary batteries are arranged near the distribution line, there is a possibility of malfunction or malfunction of isolated operation detection due to mutual interference. Moreover, although it is very small, there is a concern about the influence on the power quality by constantly changing the output.

  An object of the present invention is to provide an economically advantageous secondary battery single-operation preventing apparatus and single operation that can reliably detect that a secondary battery is in a single operation state due to a system fault and prevent single operation. It is to provide a prevention method.

  In order to achieve the above object, the present invention constitutes an isolated operation prevention device for a secondary battery by the following means.

  The invention corresponding to claim 1 is a power distribution system in which a plurality of secondary batteries are connected to a power distribution line connected to a power supply bus via a circuit breaker as a distributed power source via a power receiving circuit breaker, respectively. A fault detecting means for giving a trip command to the circuit breaker when an accident occurring in the circuit is detected, and when the circuit breaker is opened by a trip command given by the accident detecting means, the fault point information is obtained from the voltage and current information in the distribution system. And a calculating means for obtaining position information of the secondary battery, an accident detection information detected by the accident detecting means, an accident point information obtained by the calculating means, and a distributed power source that is operated independently from the position information of the secondary battery Distributed power source selecting means for selecting the power source, transmitting means for transmitting an operation stop command to the distributed power source selected by the distributed power source selecting means, and operation transmitted from the transmitting means A transmission means for transmitting a stop command to the distributed power supply side, a receiving means for receiving an operation stop command provided on the distributed power supply side and transmitted through the transmission means, and the power reception by the operation stop command received by the reception means. And a distributed power supply stopping means for interrupting the circuit breaker and stopping the operation of the distributed power supply.

  According to a second aspect of the present invention, there is provided a secondary battery isolated operation preventing device according to the first aspect of the present invention, wherein the distributed power source selecting means removes a system fault factor from the accident detecting means to the circuit breaker. When the trip command is canceled, it has a function of issuing an operation permission command to the selected distributed power supply, and the operation stop means receives the operation permission command by the reception means and receives power on the distributed power supply side in a stopped state. A function of restarting the operation by turning on the power receiving circuit breaker on condition that the voltage at the connection point of the circuit breaker is normal.

  According to a third aspect of the present invention, there is provided a secondary battery isolated operation prevention device according to the first or second aspect of the present invention, wherein the operation is stopped or transmitted from the transmitting means to the receiving means on the distributed power source side. As the permission command transmission means, a transmission line or the like that uses an optical fiber for a distribution network is used.

  According to a fourth aspect of the present invention, there is provided a distribution system in which a plurality of secondary batteries are connected to a distribution line connected to a power supply bus via a circuit breaker as a distributed power source via a power receiving circuit breaker, respectively. A first step of opening the circuit breaker by giving a trip command to the circuit breaker upon detection of an accident occurring in the circuit breaker; and, when the circuit breaker is opened, the fault point information and the information from the voltage and current information in the distribution system The second step for obtaining the position information of the secondary battery, the accident detection information detected in the first step, the accident point information obtained in the second step, and the position information of the secondary battery are used for independent operation. A third step of selecting a distributed power source and transmitting an operation stop command to the distributed power source side, and receiving the operation stop command transmitted in the third step on the selected distributed power source side, Cut off Both the fourth step of stopping the operation of the distributed power, to prevent the independent operation of the distributed power.

  The invention corresponding to claim 5 is the method for preventing secondary operation of the secondary battery according to the invention corresponding to claim 4, wherein the system fault factor is removed and the trip command to the circuit breaker given from the first step is released. And a fifth step of issuing an operation permission command to the selected distributed power source, and a connection point of the power receiving circuit breaker on the distributed power source side which is in a stopped state when the operation permission command is received on the selected distributed power source side In the sixth step of turning on the power receiving circuit breaker on condition that the voltage of the distributed power source is normal, the operation of the distributed power source in the stopped state is resumed.

  According to the present invention, it is possible to select only the distributed power source corresponding to the system fault section by the distributed power source selection means, and to issue an operation stop or return command for independent operation via the shared transmission means. It is possible to prevent the secondary battery from being operated alone with high accuracy.

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

  FIG. 1 is a block diagram showing a secondary battery isolated operation preventing apparatus according to the first embodiment of the present invention. The same elements as those in FIG.

  In FIG. 1, a distribution substation bus 3 is connected to an upper power transmission system 1 via a distribution transformer 2, and a distribution line 5 is connected to the distribution substation bus 3 via a circuit breaker 4. . A load bus 24 is connected to this distribution line 5 via a power receiving circuit breaker 7 for each customer, and a load 6 is connected to the load bus 24 and a secondary battery 8 is connected.

  On the other hand, in the distribution substation, the voltage of the bus 3 is detected by the voltage transformer 9, and the current flowing from the substation bus 3 to each distribution line 5 is detected by the current transformer 10, and the detected voltage and current are detected. When the protection relay 11 is input and the protection relay 11 is operated, a trip signal is output to the circuit breaker 4 via the trip circuit 12 by the output.

The output of the trip circuit 12 is given to the distributed power supply selection circuit 17, and the output of the distributed power supply selection circuit 17 is sent to the transmission circuit 14a by the signal transmitter 13a.
The transmission circuit 14a is a high-speed transmission path using an optical fiber or the like for a distribution network that has been introduced in recent years, and a single installed transmission path can be used as it is.

  The output signal of the signal transmitter 13a transmitted to the transmission circuit 14a is received by a signal receiver 15a provided corresponding to each consumer, and the signal received by the signal receiver 15a is a distributed power source. The power is sent to the stop circuit 18, and is output from the distributed power supply stop circuit 18 to the power receiving circuit breaker 7 and the secondary battery 8.

  In this case, the signal transmitter 13a and the signal receiver 15a are, of course, different from the conventional configuration in that they include a conversion unit that converts an optical signal into an electric signal and an electric signal into an optical signal. Needless to say.

On the other hand, 19 is a power distribution automation central processing unit provided on the substation side. This central processing unit 19 is obtained from a slave station of a power distribution switch (not shown) through a transmission circuit 14a via a signal receiver 15b. The calculation output of the central processing unit 19 is given to the distributed power source selection circuit 17.
Next, the operation of the single battery preventing apparatus for secondary batteries configured as described above will be described.
Now, when an accident such as a ground fault or a short circuit occurs in the distribution system 5, the protection relay 11 detects the occurrence of the accident from the change in voltage and current obtained through the voltage transformer 9 and the current transformer 10. The feeder is specified, and a cutoff command is given to the corresponding circuit breaker 4 via the trip circuit 12. As a result, the breaker 4 is opened and the continuation of the accident is prevented, which is the same as the conventional one.

  At this time, the central processing unit 19 for distribution automation receives voltage and current information and fault point information in the distribution system from the slave station of the distribution switch (not shown) in the distribution line 5 via the transmission circuit 14a and the signal receiver 15b. Obtainable.

  Further, the distributed power source selection circuit 17 selects a secondary battery to be operated independently from the accident information from the trip circuit 12, the accident point information from the central processing unit 19, and the position information of the secondary battery 8 held inside, An operation stop command is sent from the signal transmitter 13a to the distributed power supply stop circuit 18 corresponding to the corresponding secondary battery 8 via the transmission circuit 14a and the signal receiver 15a. As a result, the distributed power supply stop circuit 18 trips the power receiving breaker 7 and stops the operation of the secondary battery 8 that is operated alone.

As described above, according to the present embodiment, accident information due to the operation of the protective relay 11 with high operation accuracy in the distributed power source selection circuit 17, accident point information from the central processing unit 19, and position information of the secondary battery 8 held therein. Based on such information, only the secondary battery 8 that is a single system is selected, an operation stop command is given to the distributed power supply stop circuit 18 corresponding to the relevant secondary battery 8, and the power receiving circuit breaker 7 is tripped. Since the secondary battery 8 is separated from the power distribution system, a reliable operation can be expected and the range to be stopped can be limited to the minimum necessary.
Further, since the transmission circuit 14a uses a high-speed transmission line that has already been installed, there is no need for a dedicated line or the like, and even if the number of secondary batteries increases, it can be realized at low cost.

  In addition, there is a low possibility of malfunction and malfunction due to a balance between supply and demand, as seen in a passive type isolated operation detection device, a malfunction due to mutual interference, such as an active type isolated operation detection device, and a low possibility of malfunction. It has the effect that there is no concern of affecting power quality.

  FIG. 2 is a block diagram of a secondary battery single-operation preventing apparatus showing a second embodiment of the present invention. The same components as those in FIG. Is described.

  In the second embodiment, when the system fault factor is removed in the distributed power source selection circuit 17 on the substation side and the trip command issued to the circuit breaker 4 via the trip circuit 12 is released by the return of the protection relay 11, the selection is made. A function of issuing an operation permission command is added to the distributed power source, and the operation permission command is received by the signal receiver 15a as an operation stop circuit provided corresponding to each consumer, and the system of the secondary battery 8 Provided with an operation resumption determining function for resuming operation of the secondary battery 8 by turning on the power receiving circuit breaker 7 on condition that the voltage signal detected by the voltage transformer 9a provided at the connection point is normal. An operation stop circuit 20 is provided.

  This operation resumption determination function is configured as shown in FIG. 3, for example. That is, a voltage recovery determination circuit 21 to which a voltage signal detected by the voltage transformer 9 is input, an operation resumption reception circuit 22 to which an output of the voltage recovery determination circuit 21 and a signal received by the signal receiver 15a are input, The voltage recovery determination circuit 21 and the AND circuit 23 to which the output of the operation resumption receiving circuit 22 is input. When the AND condition of the AND circuit 23 is satisfied, the power receiving circuit breaker 7 and the secondary battery 8 are turned on and off. This is realized by giving an operation restart command.

In the secondary battery isolated operation preventing device having such a configuration, when the accident factor in the distribution system is removed and the protective relay 11 is reset, the trip circuit 12 gives the circuit breaker 4 a command to cancel the trip. At the same time, a return signal is also sent to the distributed power supply selection circuit 17.
In the distributed power source selection circuit 17, after confirming that there is no abnormality in the signal from the central processing unit 19, a return command is given to the operation stop circuit 20 of the secondary battery 8 which has issued the stop command. The signal is sent via the transmission circuit 14a and the signal receiver 15a.
In the operation stop circuit 20, as shown in FIG. 3, the return command received by the operation resumption receiving circuit 22 and the AND condition that the self-end voltage determined by the voltage return determination circuit 21 is normal are satisfied. At the same time that a closing command is given to the circuit breaker 7, an operation restart command is given to the secondary battery 8.

In this way, when the cause of the accident is removed and the distribution system returns to the normal state, the secondary battery can be quickly placed in parallel with the system and returned to the operating state.
According to the present invention, it is possible to enter a single operation state without being affected by the supply / demand balance between the secondary battery and the load, which is a drawback of the conventional passive method, and interference between the single operation detection devices using a number of active methods. A trip / stop point command can be sent to the secondary battery to prevent isolated operation. Furthermore, when the system fault is removed and the system is recovered, the secondary battery can be quickly paralleled in the system and the operation state can be restored.
In order to take advantage of this effect, particularly in terms of cost, the application of the present invention can eliminate a part of the conventional isolated operation detection device, or introduce a system / operational system such as a fee discount. It is effective to make it possible to start / stop the secondary battery according to a command on the system side in advance by a contract with the owner of the secondary battery.

The block diagram of the independent operation prevention apparatus of the secondary battery which shows the 1st Embodiment of this invention. The block diagram of the independent operation prevention apparatus of the secondary battery which shows the 2nd Embodiment of this invention. The block diagram which shows the detail of the driving | running | working restart determination circuit in the same embodiment. The block diagram which shows an example of the independent operation prevention apparatus of the conventional secondary battery. The block diagram which shows the other example of the independent operation prevention apparatus of the conventional secondary battery.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... High-order power transmission system, 2 ... Distribution transformer, 3 ... Distribution substation bus, 4 ... Circuit breaker, 5 ... Distribution line, 6 ... Load, 7 ... Receiving circuit breaker, 8 ... Secondary battery, 9 ... Voltage transformer, 10 ... Current transformer, 11 ... Protective relay, 12 ... Trip circuit, 13 ... Signal transmitter, 14 ... Transmission circuit, 15 ... Signal receiver, 16 ... Single operation detection device, 17 ... Distributed power supply selection circuit DESCRIPTION OF SYMBOLS 18 ... Distributed power supply stop circuit, 19 ... Central processing unit, 20 ... Distributed power supply stop circuit having an operation restart determination function, 21 ... Voltage recovery determination circuit, 22 ... Operation restart reception circuit, 23 ... AND circuit, 24 ... Load bus

Claims (5)

  In a distribution system in which a plurality of secondary batteries are connected to a distribution line connected to a power supply bus via a circuit breaker as a distributed power source via a power receiving circuit breaker, the circuit breaker is detected when an accident occurring in the distribution system is detected. Accident detection means for giving a trip command to the device, and when the circuit breaker is opened by the trip command given by the accident detection means, the fault point information and the position information of the secondary battery are obtained from the voltage and current information in the distribution system. A calculation means for obtaining, a distributed power supply selection means for selecting a distributed power supply that is operated independently from the accident detection information detected by the accident detection means, the accident point information obtained by the calculation means, and the position information of the secondary battery, Transmitting means for transmitting an operation stop command to the distributed power source selected by the distributed power source selecting means, and transmitting the operation stop command transmitted from the transmitting means to the distributed power source side Transmitting means, receiving means provided on the distributed power supply side for receiving an operation stop command transmitted through the transmission means, and shutting off the power receiving breaker by the operation stop command received by the receiving means and distributing A device for preventing isolated operation of a secondary battery, comprising: a distributed power supply stopping means for stopping the operation of a power supply.   2. The secondary battery isolated operation prevention device according to claim 1, wherein the distributed power source selecting means is selected when a system fault factor is removed and a trip command to the circuit breaker is canceled by the fault detecting means. The operation stop command is received by the receiving unit, and the voltage at the interconnection point of the power receiving breaker on the distributed power source side in the stopped state is normal. A secondary battery single-operation preventing apparatus having a function of restarting operation by turning on the power receiving breaker on condition that there is a certain condition.   3. The secondary battery isolated operation prevention device according to claim 1 or 2, wherein the transmission stop means or permission command transmission means transmitted from the transmitting means to the receiving means on each of the distributed power sources is light for a distribution network. An apparatus for preventing an independent operation of a secondary battery, wherein a transmission line made of fiber or the like is used.   In a distribution system in which a plurality of secondary batteries are connected to a distribution line connected to a power supply bus via a circuit breaker as a distributed power source via a power receiving circuit breaker, the circuit breaker is detected when an accident occurring in the distribution system is detected. A first step of giving a trip command to the breaker to open the breaker; and a step of obtaining the fault point information and the position information of the secondary battery from the voltage and current information in the distribution system when the breaker is opened. The distributed power source is selected by selecting a distributed power source that is operated independently from the accident detection information detected in step 2, the accident detection information detected in the first step, the accident point information obtained in the second step, and the position information of the secondary battery. A third step of transmitting an operation stop command to the side, and receiving the operation stop command transmitted in the third step on the selected distributed power source side, shuts off the power receiving circuit breaker and stops the operation of the distributed power source The by 4 steps, islanding prevention method of a secondary battery, characterized by preventing the independent operation of the distributed power to.   5. The method for preventing isolated operation of a secondary battery according to claim 4, wherein when a system fault factor is removed and the trip command to the circuit breaker given in the first step is released, an operation permission command is issued to the selected distributed power source. And receiving the operation permission command on the selected distributed power source side, the received power is received on the condition that the voltage at the interconnection point of the power receiving breaker on the distributed power source side in the stopped state is normal. A method for preventing secondary operation of the secondary battery, wherein the operation of the distributed power supply in the stopped state is resumed by the sixth step of turning on the circuit breaker.

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