JP2001258156A - Control method of power storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method of a power storage system capable of improving a VI value with a receiving demand kept. SOLUTION: A power storage system is disposed between tunnel ventilation equipment in which a plurality of ventilation fans 2 are driven or stopped sequentially and the required number of ventilation fans are operated, and a system power source 1 of a power system, wherein a power converter 5 performs compensation according to a compensation power command to start operating the prescribed number of ventilation fans 2 added to the defined number of ventilation fans 2 under operation by means of charging power stored in the secondary battery 6 if a demand alarm occurs which is outputted by deterioration of the receiving demand where the receiving power of the ventilation equipment is estimated on an arbitrary time basis when the power converter 5 having a secondary battery 6 on its DC side performs compensation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for a power storage system, and more particularly, to a power converter provided between a power demanding facility and a power supply of a power system and having a secondary battery for performing a compensation operation. The present invention relates to a control method for a power storage system.

[0002]

2. Description of the Related Art For example, in a ventilation facility for a road tunnel, the operation of a plurality of ventilation fans installed inside the tunnel is controlled by a system power supply of a power system. The operation control of the ventilation fan is performed, for example, by increasing the number of operating ventilation fans when the smoke concentration (VI value) or the exhaust gas concentration (CO value) in the tunnel is deteriorated or when deterioration is expected. Alternatively, the operation is performed so as to reduce the smoke concentration and the exhaust gas concentration by extending the operation time.

[0003] Depending on the operating conditions of the ventilation fan, there is a possibility that the contracted power will be exceeded. Therefore, in the tunnel ventilation system, a power storage system for reducing the peak of the received power between the power supply and the system power of the power system. Is installed. As shown in FIG. 5, this type of power storage system includes an AC switch 3 and an interconnection transformer 4 between a system power supply 1 (power receiving side) and a ventilation fan 2 (load side) of tunnel ventilation equipment. The power converter 5 is connected via the power converter 5 and a secondary battery 6 such as a lead battery is provided on the DC side thereof.

The power converter 5 is a bidirectional AC / DC converter having an inverter function and a converter function. The converter operates to convert surplus AC power from the system power supply 1 to DC and charge the secondary battery 6, Inverter operation of converting the DC power charged in the secondary battery 6 into AC and supplying the DC power to the ventilation fan 2 of the tunnel ventilation facility, which is a load, is executed.

The power converter 5 includes an instrumentation transformer 7 (PT) and a current transformer 8 (CT) provided on a bus of the power system.
Is controlled by an output signal (compensation power command) of the control circuit 9 having the voltage and current signals detected by the control circuit 9 as control inputs. In the control circuit 9, when the operation state of the ventilation fan 2 by the system power supply 1 is light load, the power converter 5 is operated as a converter to convert excess AC power of the system power supply 1 to DC and Charge to 6. When the operation state of the ventilation fan 2 by the system power supply 1 is heavy,
When the load power calculated based on the voltage and current signals becomes equal to or more than a predetermined set value, the charging power stored in the secondary battery 6 of the power storage system is output as compensation power by the excess (see FIG. 6). Of the ventilation fans 2 in operation, some of the ventilation fans 2 are operated by the compensated power by the secondary battery 6. Excessive contract power is prevented by peak-cutting the received power by the discharge power of the secondary battery 6 of this power storage system.

[0006]

By the way, as described above, the received power is peak-cut by the discharge power of the secondary battery 6 of the power storage system to prevent the contract power from being exceeded. Specifically, the operation control of the ventilation fan 2 in the tunnel ventilation facility will be described in detail below with reference to FIG.

FIG. 7 shows a simulation of the control of the conventional power storage system. FIG. 7A shows integrated data (hereinafter referred to as demand) obtained by integrating the electric power every predetermined time (30 minutes). A indicates a power receiving demand which is integrated data on the power receiving side, and B indicates a load demand which is integrated data on the load side. This power receiving demand A becomes the contract power of the system power supply 1. FIG. 3B shows instantaneous power data, in which C denotes received power, D denotes load power, and E denotes compensation power by the secondary battery 6. FIG. 3C shows a demand alarm that is generated when the load power D is going to exceed a predetermined set value (for example, 800 kW), that is, when the power demand A is about to increase due to the increase in the load demand B. G indicates the case where the power compensation by the secondary battery 6 is performed. FIG. 6D shows the smoke concentration (VI value) detected by the sensor 10 (see FIG. 6) installed in the tunnel and the smoke concentration increases when the VI value falls below a predetermined level (for example, 30). H and J indicate the VI value and the VI deterioration signal when power compensation is performed by the secondary battery 6;
I and K are a VI value and a VI deterioration signal when power compensation by the secondary battery 6 is not performed. The higher the VI value, the lower the smoke concentration.

In a tunnel ventilation system, a ventilation fan 2
Are sequentially driven one by one, and when a predetermined number (for example, 10) or less of the ventilation fans 2 are operated, if the soot concentration in the tunnel increases and the VI value deteriorates below a predetermined level, the VI deteriorates. The signal is used to increase the number of operating ventilation fans 2, reduce the soot concentration in the tunnel, and try to control the direction to improve the VI value.

The load power D increases due to the increase in the number of operating ventilation fans 2, and the power C received by the system power supply 1 increases accordingly. When the received power C tries to exceed a predetermined set level (for example, 800 kW), the received power A
If the user attempts to exceed the contract power, a demand alarm F is generated. By this demand alarm F, a compensation operation by the secondary battery 6 of the power compensation system is executed, and a part of the ventilation fans 2 of all the ventilation fans 2 in operation is operated.
Is driven by the compensation power by the secondary battery 6. As described above, part of all the ventilation fans 2 in operation is driven by the system power supply 1 and the rest is driven by the secondary battery 6, so that the number of ventilation fans 2 operated increases and the load power D Is increased, the received power C can be peak-cut to a predetermined level (see FIG. 7B).

When the number of ventilation fans 2 in operation is the predetermined number (10
When the smoke concentration in the tunnel further increases and the VI value deteriorates below a predetermined level,
The number of operating ventilation fans 2 is not increased by the VI deterioration signal. That is, there is a limit to the compensation power provided by the secondary battery 6, and there is a limit to the number of ventilation fans 2 that can be driven by the compensation power. The received power C exceeds a predetermined set level, and the received power A exceeds the contracted power. Therefore, in this case, by prioritizing the power receiving demand A ignoring the VI deterioration signal, the power receiving demand A is prevented from exceeding the contract power.

However, if the number of operating ventilation fans 2 is restricted in order to maintain the power receiving demand A, the soot concentration in the tunnel increases and the VI value deteriorates, making it difficult to improve the VI value. is there. On the other hand, the received power C
7 (d), the power is compensated by the secondary battery 6 (H in the figure) and the power is not compensated by the secondary battery 6, as can be seen from FIG. (I in the figure), there is no improvement in the VI value.
It is clear that even if the peak cut of the received power C is performed with the compensation power by the secondary battery 6, it does not contribute to the improvement of the VI value.

In view of the above, the present invention has been proposed in view of the above problems, and an object of the present invention is to provide a method of controlling a power storage system capable of improving a VI value while maintaining a power receiving demand. It is in.

[0013]

As a technical means for achieving the above object, the present invention relates to a power demanding equipment in which a plurality of controlled devices are sequentially driven or stopped and the required number of the devices are operated. In a power storage system installed between a power source of a grid and a power converter in which a secondary battery is disposed on a DC side performs a compensation operation, the received power of the power demanding equipment is integrated every arbitrary time. When a demand alarm output due to the deterioration of the received power demand occurs, a predetermined number of control target devices added to the predetermined number of control target devices in operation are started to operate by the charging power stored in the secondary battery. The power converter performs a compensation operation according to the compensation power command to be performed (claim 1).

According to the present invention, power reception is performed by starting operation of a predetermined number of control target devices added to the predetermined number of control target devices in operation with power compensation by the secondary battery based on generation of a demand alarm. It is possible to recover from the situation deterioration at the installation location of the power demand facility while maintaining the demand.

Further, in the present invention, as the condition for starting the compensation operation of the power converter that supplies the compensation power by the secondary battery, the compensation power is output due to the deterioration of the electricity reception demand obtained by integrating the electricity reception power of the power demand equipment at every arbitrary time. In addition to the demand alarm, the situation alarm output due to the deterioration of the situation at the installation location of the power demanding equipment is added. Based on both the demand alarm and the situation alarm, the control of the default number of vehicles operating with the compensated power by the secondary battery is performed. It is desirable to start operation of a predetermined number of control target devices added to the target device (claim 2).

[0016] If the power compensation by the secondary battery is executed based on both the demand alarm and the situation alarm in this manner, the situation at the installation location of the power demand equipment deteriorates to a predetermined level or less while the power receiving demand is maintained. Only when can the situation be remedied.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail. In the following embodiment, the present invention is applied to a power storage system having the circuit configuration shown in FIG. 5, and the same parts are denoted by the same reference numerals. The difference between the present invention and the conventional example is that
This is a compensation operation by the secondary battery 6 executed by the control circuit 9.

In this embodiment, a case will be described in which the power storage system of the present invention is installed in a ventilation facility of a road tunnel. However, the present invention is not limited to this, and a plurality of controlled devices are sequentially driven or driven. The present invention can be applied to other power demand facilities that are stopped and whose required number is operated.

The power compensation system according to the embodiment includes an AC switch 3 and an interconnection between a system power supply 1 (power receiving side) of a power system and a ventilation fan 2 (load side) of a tunnel ventilation facility which is a power demanding facility. A power converter 5 is connected via a power transformer 4, and a secondary battery 6 such as a lead battery is disposed on the DC side of the power converter 5.

The power converter 5 is a bidirectional AC / DC converter having an inverter function and a converter function. The power converter 5 converts a surplus AC power from the system power supply 1 into a direct current and charges the secondary battery 6. Inverter operation of converting the DC power charged in the secondary battery 6 into AC and supplying the DC power to the ventilation fan 2 of the tunnel ventilation facility, which is a load, is executed. The power converter 5 includes a voltage and current signal detected by an instrument transformer 7 (PT) and a current transformer 8 (CT) provided on a bus of an electric power system, and a sensor 1 installed in a tunnel.
It is controlled by an output signal (compensation power command) of the control circuit 9 which uses the soot concentration (VI value) detected by 0 as a control input.

A plurality of ventilation fans 2 to be controlled are provided in the tunnel, and the number of the operating fans depends on the received power, the smoke concentration (VI value) in the tunnel, and the exhaust gas concentration (CO value). Be increased or decreased. For example, when the smoke concentration (VI value) in the tunnel is deteriorated or when the VI value is expected to be worse, the smoke concentration is reduced by increasing the number of operating ventilation fans 2. If the received power exceeds the predetermined level and the demand exceeds the contracted power by increasing the number of operating ventilation fans 2, the predetermined number of ventilation fans 2 in operation is added to the predetermined number of ventilation fans 2. Of the ventilation fan 2 is driven by the compensation power by the secondary battery 6 of the power storage system.

In the control circuit 9, when the system power supply 1 is operating a predetermined number or less of the ventilation fans 2, the power converter 5 is operated as a converter to convert excess AC power of the system power supply 1 into DC. Then, the secondary battery 6 is charged.
Also, when the predetermined number of ventilation fans 2 are operated by the system power supply 1 and the power receiving demand is going to exceed the contracted power or is expected to exceed the contracted power, it is added to the predetermined number of ventilation fans 2. And a predetermined number of ventilation fans 2
The operation is started by outputting the charging power stored in the secondary battery 6 of the power storage system as compensation power (FIG. 1).
reference). Thereby, the VI value is improved by the discharge power of the secondary battery 6 of the power storage system while the power receiving demand is maintained as described later.

More specifically, in this embodiment, the operation control of the ventilation fan 2 in the tunnel ventilation facility will be described in detail below with reference to FIG.

FIG. 3 shows a simulation of the control of the power storage system of this embodiment, and FIG.
Is integrated data (hereinafter, referred to as demand) obtained by integrating electric power at every predetermined time (30 minutes). A is a power receiving demand that is integrated data on the power receiving side, and B is a load demand that is integrated data on the load side. Show. This power receiving demand A becomes the contract power of the system power supply 1. FIG. 3B shows instantaneous power data, in which C denotes received power, D denotes load power, and E denotes compensation power by the secondary battery 6. FIG. 4C shows a demand alarm that is generated when the load power D is going to exceed a predetermined set value (for example, 800 kW), that is, when the power receiving demand A is about to increase due to an increase in the load demand B. G is for power compensation by the secondary battery 6, and G is
Is not performed. FIG. 4D shows the smoke concentration (VI value) in the tunnel and the VI deterioration signal output when the smoke value increases when the VI value falls below a predetermined level (for example, 30). J is the VI value and VI when power is compensated by the secondary battery 6.
The deterioration signals, I and K, are the VI value and the VI deterioration signal when the power compensation by the secondary battery 6 is not performed. In addition,
The higher the VI value, the lower the smoke concentration.

In the tunnel ventilation equipment, the ventilation fan 2
Are sequentially started one by one, and a predetermined number (for example, 10
When the smoke concentration in the tunnel rises and the VI value deteriorates to a predetermined level or less while the following ventilation fan 2 is operated, the number of operating ventilation fans 2 is increased by the VI deterioration signal, and Is controlled in such a way as to reduce the soot concentration in the inside to improve the VI value.

The load power C increases due to the increase in the number of operating ventilation fans 2, and the power C received by the system power supply 1 increases accordingly. When the received power C tries to exceed a predetermined set level (for example, 800 kW), the received power A
If the user attempts to exceed the contract power, a demand alarm F is generated. In the control circuit 9 of this embodiment, if the number of operating ventilation fans 2 is a predetermined number based on the demand alarm F output due to the deterioration of the power receiving demand A, the predetermined number of ventilation fans 2 added to the predetermined number of ventilation fans 2 Number (for example, 2
A compensation power command is output to the power converter 5 so as to start the operation of the ventilation fan 2 of the vehicle (unit) with the charging power stored in the secondary battery 6 (see FIG. 1).

With respect to the predetermined number (10) of the ventilation fans 2 during operation, the predetermined number (2) of the ventilation fans 2 driven by the received power C from the system power supply 1 and added by the demand alarm F is provided. Are driven by the compensation power E by the secondary battery 6 of the power storage system. Here, a predetermined number of ventilation fans 2 are connected to the system power supply 1 as in the prior art.
By operating with the received power C, the time during which the received power C exceeds the predetermined level is short even without peak-cutting the portion where the received power C exceeds the predetermined level (800 kW). There is almost no difference as compared with the conventional case where the received power C is peak-cut [see FIGS. 3 (a) and 7 (a)].

As a result, when the demand alarm F is generated (see F in FIG. 3C), the ventilation fan 2 driven by the compensation power E by the secondary battery 6 is added, and the The smoke concentration decreases, the VI value increases,
The situation in the tunnel is improved (see H and I in FIG. 3D). As can be seen from FIG. 3D, this is the case where power compensation is performed by the secondary battery 6 (H in the figure) and the case where power compensation is not performed by the secondary battery 6 (I in the figure). It is apparent from the comparison that it contributes to the improvement of the VI value.

On the basis of the demand alarm F output by predicting the excess of the power receiving demand A, a predetermined number of ventilation fans 2 added to the predetermined number of ventilation fans 2 during operation are stored in the secondary battery 6. By outputting the compensation power command to the power converter 5 so as to start the operation with the stored charging power, the VI value can be improved while the power receiving demand A is maintained.

In this embodiment, since the power compensation by the secondary battery 6 is executed based only on the demand alarm F output by the prediction of the excess of the power receiving demand A, V
Regarding the improvement of the I value, regardless of whether or not the VI deterioration signal J is output (see FIG. 3D), the VI value is improved in accordance with the generation timing of the demand alarm F.

In another embodiment, the demand alarm F is output when the power receiving demand A is predicted to be exceeded, and the demand alarm F is issued when the smoke concentration in the tunnel rises and the VI value becomes lower than a predetermined level (for example, 35). The power compensation by the secondary battery 6 is executed based on both the VI deterioration signal J (see FIG. 2).

The load power D increases due to the increase in the number of operating ventilation fans 2, and the power C received by the system power supply 1 increases accordingly. When the received power C tries to exceed a predetermined set level (for example, 800 kW), the received power A
If the user attempts to exceed the contract power, a demand alarm F is generated. Further, when the smoke concentration in the tunnel increases and the VI value decreases, a VI deterioration signal J is issued.

In the control circuit 9 of this embodiment, the demand alarm F output by the prediction of the excess of the power receiving demand A is output.
And a predetermined number (for example, two) of ventilation fans 2 added to the predetermined number (for example, ten) of ventilation fans 2 in operation based on the VI deterioration signal J due to the deterioration of the soot concentration in the tunnel. A compensation power command is output to the power converter 5 so that the operation is started with the charging power stored in the secondary battery 6 (see FIG. 2).

Thus, when both the demand alarm F and the VI deterioration signal J are generated, the ventilation fan 2 driven by the compensation power by the secondary battery 6 is added.
The situation inside the tunnel is improved only when the smoke concentration in the tunnel decreases and the VI value increases, and as a result, only when the VI value deteriorates (see FIG. 4). As can be seen from FIG. 4D, this is the case where power compensation is performed by the secondary battery 6 (H in the figure) and the case where power compensation is not performed by the secondary battery 6 (I in the figure). It is apparent from the comparison that it contributes to the improvement of the VI value.

As described above, based on both the demand alarm F output by the prediction of the excess of the power receiving demand A and the VI deterioration signal J due to the deterioration of the soot concentration in the tunnel, the ventilation fan 2 is added to a predetermined number of the ventilation fans 2 during operation. The compensation power command is output to the power converter 5 so that the predetermined number of ventilation fans 2 are started to operate with the charging power stored in the secondary battery 6, so that the power receiving demand A is maintained. Thus, only when the VI value has deteriorated to a predetermined level or less, the VI value can be improved.

In each of the above embodiments, the secondary battery 6
Has a capacity enough to operate the added ventilation fan 2, so that it can be applied with a relatively small capacity. Also, the capacity of the power converter 5 corresponds to the ventilation fan 2.
, The capacity is easily determined.

[0037]

According to the present invention, there is provided a power storage system installed between a power demanding facility in which a plurality of controlled devices are sequentially driven or stopped and a required number of the devices are operated and a power supply of a power system. When the power converter in which the secondary battery is disposed on the DC side performs a compensation operation, a demand alarm output due to the deterioration of the power receiving demand obtained by integrating the power receiving power of the power demanding equipment at every arbitrary time has occurred. At this time, the power converter performs a compensation operation according to a compensation power command for starting operation of a predetermined number of control target devices added to the predetermined number of control target devices in operation with the charging power stored in the secondary battery. Therefore, based on the generation of the demand alarm, the predetermined number of control target devices added to the predetermined number of control target devices during operation are driven with the power compensation by the secondary battery. It is thus possible to recover the situation worse at the installation location of the power demand equipment while maintaining the power receiving demand.

Further, in the present invention, as the condition for starting the compensation operation of the power converter that supplies the compensation power by the secondary battery, the compensation power is output due to the deterioration of the electricity reception demand obtained by integrating the electricity reception power of the power demand equipment at every arbitrary time. In addition to the demand alarm, the situation alarm output due to the deterioration of the situation at the installation location of the power demanding equipment is added. Based on both the demand alarm and the situation alarm, the control of the default number of vehicles operating with the compensated power by the secondary battery is performed. When a predetermined number of control target devices added to the target device are driven, by executing power compensation by the secondary battery based on both the demand alarm and the status alarm, the power demand equipment can be maintained while maintaining the power receiving demand. Only when the situation at the installation location has deteriorated to a predetermined level or less, the situation can be restored. As a result, since it is possible to cooperate with the improvement of the original environment of the power demanding equipment, it is possible to control the operation of the control target equipment at the most necessary timing, thereby improving the efficiency of equipment operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control flow according to a first embodiment of the present invention.

FIG. 2 is a waveform chart showing each data by simulation in the first embodiment.

FIG. 3 is a block diagram showing a control flow according to a second embodiment of the present invention.

FIG. 4 is a waveform chart showing each data by simulation in the second embodiment.

FIG. 5 is a circuit diagram showing a schematic configuration of a power storage system.

FIG. 6 is a block diagram showing a control flow in a conventional method.

FIG. 7 is a waveform chart showing each data obtained by simulation in the conventional method.

[Explanation of symbols]

 Reference Signs List 1 power supply 2 controlled device (ventilation fan) 5 power converter 6 secondary battery

Claims (3)

[Claims] In a power storage system installed between a power demanding facility in which a plurality of controlled devices are sequentially driven or stopped and a required number of the devices are operated, and a power supply of a power system, a secondary battery has a direct current. When the power converter arranged on the side performs the compensating operation, when the demand alarm output due to the deterioration of the power receiving demand obtained by integrating the power receiving power of the power demanding equipment at an arbitrary time interval occurs, the power converter is in operation. The power converter performs a compensation operation in response to a compensation power command for starting a predetermined number of control target devices added to the predetermined number of control target devices by using the charging power stored in the secondary battery. A method for controlling an electric power storage system. 2. A power storage system installed between a power demanding facility in which a plurality of control target devices are sequentially driven or stopped and a required number of the devices are operated, and a power supply of a power system, wherein a secondary battery has a direct current. When the power converter arranged on the side performs the compensating operation, the demand alarm output due to the deterioration of the power receiving demand obtained by integrating the power receiving power of the power demanding equipment at an arbitrary time interval, and at the installation location of the power demanding equipment. When both the situation alarm output due to the situation deterioration and the situation alarm are generated, a predetermined number of control target devices added to the predetermined number of control target devices in operation are started to operate by the charging power accumulated in the secondary battery. A power storage system control method, wherein a power converter performs a compensation operation according to a compensation power command to be performed. 3. The control target device is a ventilation fan installed in a tunnel.
3. The control method for an electric power storage system according to claim 1.