MULTI-TERMINAL POWER CONVERSION DEVICE, MULTI-TERMINAL POWER TRANSFER DEVICE, AND POWER NETWORK SYSTEM

• US 20120173035A1
• Filed: 09/10/2010
• Published: 07/05/2012
• Est. Priority Date: 09/10/2009
• Status: Active Grant

• Current Assignee: University of Tokyo
• Original Assignee: University of Tokyo
• Inventors: Abe, Rikiya
• Granted Patent: US 9,013,902 B2
• Time in Patent Office: Days
• US Class Current: 700/297
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks
• CPC Class Codes: H02M 1/008 Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
• CPC Class Codes: H02M 5/4505 having a rectifier with controlled elements

Abstract

The present invention provides a multi-terminal power conversion device, a multi-terminal power transfer device, and a power network system which allows an existing power grid to be divided into a plurality of power grids that can be interconnected together and operated stably via existing or new transmission lines. An inter-power grid asynchronous interconnection network system includes a multi-terminal power conversion device characterized by connecting together a plurality of asynchronous power grids including a bulk power grid and controlling power so that the sum of inflow power and outflow power is zero. An intra-power grid synchronous network system includes a power apparatus control terminal device with means for controlling power for a power apparatus installed in an autonomous power grid. A plurality of inter-power grid asynchronous interconnection network systems are connected to an intra-power grid synchronous network system to integrate the power control with communication control.

Claims

1. A multi-terminal power conversion device characterized by comprising:

at least three power conversion units each comprising a self-commutated converter that converts power in a bidirectional manner and a voltage, current, and power measuring instrument that measures voltage, current, and power passing through the self-commutated converter;

a common bus that connects first ends of the power conversion units together in parallel; and

a control unit that controls a plurality of the power conversion units so that the power conversion units cooperatively set, to zero, a sum of power flowing from the power conversion units into the common bus and power fed out from the common bus to the power conversion units, based on measured values from the voltage, current, power measuring instruments, so that power is asynchronously interchanged among external circuits to which second ends of the power conversion units are connected.

2. The multi-terminal power conversion device according to claim 1, characterized in that the control unit further comprises a communication control unit connected to the control unit to enable control information about power interchange to be communicated between the control unit and an external apparatus.

3. The multi-terminal power conversion device according to claim 1, characterized by further comprising a power transceiver with a first terminal connected to the external circuit and a second terminal that is connectable to the second terminal of the power conversion unit of the multi-terminal power conversion device via an electric line.

4. A multi-terminal power transfer device characterized by comprising:

a plurality of power transceivers each with a first terminal connected to an external circuit and a second terminal that is connectable, via an electric line, to a second terminal of the power conversion unit of the multi-terminal power conversion device according to claim 2; and

a power transfer communication control unit that enables control information about power interchange to be communicated between the multi-terminal power transfer device and a communication control unit of the multi-terminal power conversion device.

5. A power network system characterized by comprising:

a first power router that is the multi-terminal power conversion device according to claim 3;

a second power router that is at least the multi-terminal power conversion device according to claim 3;

an interconnecting electric line connecting a second terminal of a power conversion unit of the multi-terminal power conversion device that is the first router to a second terminal of a power transceiver of the multi-terminal power conversion device or the multi-terminal power transfer device that is the second router; and

a WAN configured by connecting a communication control unit or a power transfer communication control unit of the first and second power routers so as to provide communication addresses to second terminals of the first and second power routers, and

in that for power interchange between external circuits connected to the first and second power routers, information including a magnitude, a direction, and a start and end times of a power conversion carried out by each of the power conversion units is transmitted and received based on the communication addresses between the first and second power routers on a transmission line including the interconnecting electric line connecting the external circuits that carry out power interchange.