JP2012016119A - System voltage regulator for consumer connecting system - Google Patents

Abstract

A system voltage regulator for a customer-connected system that can adjust the voltage of the customer-connected system to an appropriate voltage even when the number of customers having secondary batteries increases.
A control device 15 converts, via an inverter 14, DC power from a consumer secondary battery 12 into AC power and supplies the AC power to the power system, and converts AC power of the power system into DC power. The secondary battery 12 is charged, and the voltage pattern receiving device 16 receives the voltage pattern of the customer's connection system predetermined by the power supply company 18 according to the expected demand of power from the power supply company 18, and the inverter The output voltage of the inverter 14 is controlled so that the output voltage of 14 becomes the voltage pattern received by the voltage pattern receiver 16.
[Selection] Figure 1

Description

  The present invention relates to a system voltage adjusting device for a customer connection system that adjusts the voltage of a power system supplied to a consumer.

  Generally, in a consumer who has a secondary battery, when there is surplus power in the power system, the secondary battery is supplied with power supplied from the power system and charged from the secondary battery when the active power of the power system is insufficient. Active power is supplied to the power system. And when the voltage of the electric power grid to which the consumer is connected fluctuates, the voltage of the customer's connected grid is adjusted in real time on the power supply company side.

  Here, in a power supply device equipped with a power storage device, a power generation facility, etc., it is provided with power storage means for charging and discharging according to the vertical fluctuation of the voltage of the AC power supply, and when the voltage of the AC power supply is higher than the set voltage, the power storage means In some cases, excessive power is charged to suppress an increase in the voltage of the system, and at the same time, the excess power is reused or the power generated by the power generation equipment is effectively used (for example, see Patent Document 1).

  Further, in a power saving device that saves power by reducing the power consumption by controlling the output voltage to a preset reference voltage, the reference voltage is set in advance for each hour, day, day of the week, month, etc. There is one that can adjust and automatically change the reference voltage of the power saving device according to the increase or decrease of the voltage drop of the power line from the power saving device to the load, so that a large power saving effect can be obtained without trouble (For example, see Patent Document 2)

JP 2006-60983 A JP 2001-314033 A

  However, the thing of patent document 1 controls the system voltage of an electric power grid | system individually in a consumer, and not all the consumers have the function to control the system voltage of such an electric power system. Therefore, the grid voltage of the customer's connection system cannot always be adjusted to a predetermined voltage, and the grid voltage of the customer's connection system must be adjusted on the power system side. When the number of consumers having secondary batteries connected to the power system increases, the burden of adjusting the system voltage of the customer's connection system on the power system side increases. On the other hand, the thing of patent document 2 adjusts the voltage supplied to load in a consumer, and does not adjust the voltage of an electric power grid | system.

  An object of the present invention is to provide a system voltage regulator for a customer-connected system that can adjust the voltage of the customer-connected system to an appropriate voltage even when the number of customers having secondary batteries increases. .

  A system voltage regulator for a customer connection system according to the invention of claim 1 converts DC power from a secondary battery of a consumer into AC power and supplies the AC power to the power system, and converts the AC power of the power system into DC power. An inverter that converts and charges the secondary battery, a voltage pattern receiving device that receives from the power supply company a voltage pattern of the customer's connection system that is predetermined by the power supply company according to the expected demand for power, and A system voltage regulator for a consumer-connected system, comprising: a controller that controls the output voltage of the inverter so that the output voltage of the inverter becomes a voltage pattern received by the voltage pattern receiver.

  According to a second aspect of the present invention, there is provided a system voltage regulator for a customer connection system according to the first aspect, wherein the voltage pattern receiver is connected to a public communication line and is connected to the public power line from the power supply company. The voltage pattern is received.

  According to the first aspect of the present invention, the output voltage of the secondary battery of the consumer is controlled so that the voltage pattern of the customer's connection system determined in advance by the power supply company according to the expected demand of the power. Even when the number of customers having secondary batteries increases, the voltage of the customer connection system can be adjusted to a voltage pattern predetermined by the power supply company.

  According to the second aspect of the present invention, a consumer equipped with a secondary battery receives a voltage pattern from a power supply company via a public communication line, and therefore can easily distribute the voltage pattern to each consumer. .

The block diagram of the system voltage regulator of the customer connection system which concerns on embodiment of this invention. The characteristic view which shows an example of the voltage pattern of the consumer connection system | strain received from the electric power supply company to the system voltage regulator of the consumer connection system | strain which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of a system voltage regulator for a customer connection system according to an embodiment of the present invention. A plurality of consumers are connected to the customer connection system 11 of the power system, and a system voltage regulator 13 is installed in each consumer having the secondary battery 12.

  The customer connection system 11 of the power system is connected to the transformer secondary side of the substation, and the voltage is adjusted so that the power supply company has a predetermined voltage according to the expected demand of power. And when the voltage of the consumer connection system 11 fluctuates from the predetermined voltage, the voltage of the customer connection system 11 is adjusted in real time on the power supply company side. For example, the voltage is adjusted by switching the tap of the on-load tap switching transformer. When the load is heavy, the voltage is adjusted higher. When the load is light, the voltage is adjusted lower.

  The system voltage adjusting device 13 adjusts the voltage of the customer connection system 11 of the power system so that the consumer having the secondary battery 12 becomes a voltage predetermined by the power supply company. The system voltage regulator 13 includes a secondary battery 12 that performs charging / discharging, an inverter 14 that performs AC / DC conversion between the secondary battery 12 and the customer connection system 11, and a control device 15 that controls the output voltage of the inverter 14. And a voltage pattern receiving device 16 that receives a voltage pattern of the customer connection system 11 predetermined by the power supply company in accordance with the expected demand for power.

  The voltage pattern receiver 16 is connected to the power supply company 18 via the communication line 17, and the voltage pattern of the customer connection system 11 predetermined by the power supply company 18 from the power supply company 18 via the communication line 17. Receive and output to control device 15. The communication line 17 may use a dedicated communication network or the Internet, which is a public communication network.

  FIG. 2 is a characteristic diagram showing an example of a voltage pattern of the customer connection system 11 received from the power supply company. As for the voltage pattern of the customer connection system 11, a plurality of voltage patterns are determined in advance for each customer connection system 11 based on the expected power demand of the consumer connected to the customer connection system 11. FIG. 2 shows three voltage patterns A, B, and C that differ from day to day.

  For example, since the power demand differs between weekdays and holidays, different voltage patterns are prepared for weekday voltage patterns and holiday voltage patterns. Moreover, since the usage conditions of the air-conditioning equipment differ depending on the weather conditions of the day, for example, when the temperature is low and high, a voltage pattern taking into account the weather conditions is also prepared. Then, the power supply company 18 selects the most appropriate voltage pattern from among the voltage patterns prepared in advance based on the predicted demand, and distributes it to the consumer having the secondary battery 12 via the communication line 17. When the voltage pattern received by the voltage pattern receiver 16 is input, the control device 15 controls the output voltage of the inverter 14 so that the output voltage of the inverter 14 becomes the voltage pattern received by the voltage pattern receiver 16.

  Thus, even in the consumer having the secondary battery 12, the voltage of the consumer connection system 11 is controlled so that the voltage of the consumer connection system 11 becomes a voltage determined in advance by the power supply company 18. Fluctuations less than the determined voltage are reduced, and the power supply company is reduced from adjusting the voltage of the customer connection system 11 in real time.

DESCRIPTION OF SYMBOLS 11 ... Consumer connection system, 12 ... Secondary battery, 13 ... System voltage regulator, 14 ... Inverter, 15 ... Control device, 16 ... Voltage pattern receiver, 17 ... Communication line, 18 ... Power supply company

Claims (2)

An inverter that converts DC power from a secondary battery of a customer into AC power and supplies it to the power system and converts AC power of the power system into DC power and charges the secondary battery;
A voltage pattern receiving device that receives from the power supply company a voltage pattern of the customer's connection system predetermined by the power supply company according to the expected demand of power;
A system voltage regulator for a consumer-connected system, comprising: a controller that controls the output voltage of the inverter so that the output voltage of the inverter becomes a voltage pattern received by the voltage pattern receiver.   2. The system voltage regulator for a customer connection system according to claim 1, wherein the voltage pattern receiver is connected to a public communication line and receives the voltage pattern from the power supply company via the public communication line. .

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