JP-7854836-B2 - Microgrid system

JP7854836B2JP 7854836 B2JP7854836 B2JP 7854836B2JP-7854836-B2

Inventors

伊藤良幸
疋嶋秀敏
豊田靖臣

Assignees

ＮＧＫ株式会社
エナジーサポート株式会社

Dates

Publication Date: 20260507
Application Date: 20220331

Claims (4)

A microgrid system formed within a power distribution system, An active power supply device that is connected to the high-voltage distribution system and supplies active power, A reactive power compensation device that is connected to the high-voltage distribution system and supplies reactive power, Equipped with , When the power supply from the power plant is interrupted in the high-voltage distribution system, an automatic switch installed in the high-voltage distribution system switches over, and power is supplied to the high-voltage distribution system from the active power supply device. While power is being supplied from the active power supply device to the high-voltage distribution system, the reactive power compensation device monitors the voltage within the high-voltage distribution system. When the voltage in the high-voltage distribution system falls outside a predetermined range, the reactive power compensation device is a microgrid system that supplies lagging reactive power to the high-voltage distribution system to restore the voltage within the high-voltage distribution system to within a predetermined range .
A microgrid system formed within a power distribution system, An active power supply device that is connected to the high-voltage distribution system and supplies active power, A reactive power compensation device that is connected to the high-voltage distribution system and supplies reactive power, A high-voltage power factor correction capacitor connected to a high-voltage power distribution system, Equipped with, When the power supply from the power plant is interrupted in the high-voltage distribution system, an automatic switch installed in the high-voltage distribution system switches over, and power is supplied to the high-voltage distribution system from the active power supply device. While power is being supplied from the active power supply device to the high-voltage distribution system, the reactive power compensation device monitors the voltage within the high-voltage distribution system. A microgrid system that, when the voltage in a high-voltage distribution system falls outside a predetermined range, uses a high-voltage power factor correction capacitor to supply reactive power to the high-voltage distribution system, and a reactive power compensation device to supply lagging reactive power to the high-voltage distribution system to restore the voltage in the high-voltage distribution system to within a predetermined range.
A microgrid system formed within a power distribution system, An active power supply device that is connected to the high-voltage distribution system and supplies active power, A reactive power compensation device that is connected to the high-voltage distribution system and supplies reactive power, A high-voltage power factor correction capacitor connected to a high-voltage power distribution system, Equipped with, When the power supply from the power plant is interrupted in the high-voltage distribution system, an automatic switch installed in the high-voltage distribution system switches over, and power is supplied to the high-voltage distribution system from the active power supply device. While power is being supplied from the active power supply device to the high-voltage distribution system, the reactive power compensation device monitors the power factor within the high-voltage distribution system. A microgrid system that, when the power factor in a high-voltage distribution system falls outside a predetermined range, uses a high-voltage power factor correction capacitor and a reactive power compensation device to supply lagging reactive power to the high-voltage distribution system to restore the power factor within the high-voltage distribution system to within a predetermined range.
A microgrid system according to any one of claims 1 to 3, wherein the active power supply device is a battery storage device.

Description

This specification discloses technology relating to microgrid systems. Patent Document 1 discloses a microgrid system equipped with a power generation device and a battery storage device. The microgrid system in Patent Document 1 includes a heat engine power generation device and a renewable energy power generation device as power generation devices. Patent Document 1 controls the operating timing of the heat engine power generation device and the renewable energy power generation device to generate power at a constant level, thereby improving the fuel efficiency of the heat engine power generation device. Japanese Patent Publication No. 2015-015793 The first embodiment of the microgrid system is shown.A microgrid system of the second embodiment is shown. The microgrid systems disclosed herein are formed within a power distribution system supplied with electricity from a power plant. The microgrid systems can be connected to and disconnected from the power distribution lines by switches. Therefore, while the microgrid systems are connected to the power distribution lines, consumers within the microgrid can utilize electricity from the power plant. When the microgrid systems are disconnected from the power distribution lines, consumers within the microgrid can utilize electricity generated within the microgrid. A microgrid system is equipped with active power supply devices and reactive power compensation devices. The active power supply devices are connected to the high-voltage distribution system within the microgrid. That is, they are located downstream of the switches that connect to and disconnect the distribution lines from the power plant. Examples of active power supply devices include power generators and battery storage systems. Similarly, reactive power compensation devices are also connected to the high-voltage distribution system within the microgrid. Examples of reactive power compensation devices include SVCs, SVGs, TSCs, and TCRs. A reactive power compensation device can supply reactive power to a high-voltage distribution system when its voltage falls outside a predetermined range, thereby restoring the voltage to within that range. For example, during the startup of a motor or other power load, a large current may temporarily flow through the high-voltage distribution system, causing its voltage to drop outside the predetermined range. In such cases, supplying reactive power from the reactive power compensation device to the high-voltage distribution system can maintain its voltage within the predetermined range. Furthermore, a microgrid system may include a high-voltage power factor correction capacitor connected to the high-voltage distribution system within the microgrid. A high-voltage power factor correction capacitor can also supply voltage to the high-voltage distribution system, maintaining its voltage within the predetermined range. Using a high-voltage power factor correction capacitor allows for the use of a smaller (more compact) reactive power compensation device. As described above, by placing a reactive power compensation device within the microgrid, the voltage of the high-voltage distribution system can be maintained within a predetermined range. Typically, when starting a power load such as a motor, a large current (several times the normal current) flows through the high-voltage distribution system compared to normal operation. Therefore, the voltage of the high-voltage distribution system tends to drop when starting a power load. Conventionally, when designing a microgrid, a large-capacity active power supply device (such as a power generator) is used to ensure a stable power supply when starting a power load. However, a large-capacity active power supply device can be considered over-engineered during normal operation. The above microgrid system, by using both an active power supply device and a reactive power compensation device, allows for the selection of an active power supply device that matches the normal operation of the power load. Therefore, the above microgrid system can use a small-capacity (small-sized) active power supply device. As a result, the installation space costs and equipment costs for constructing the microgrid system can be reduced.