Alternating current/direct current home smart micro-grid coordination system and operation method thereof

Patent metadata

Field	Value
Publication number	US-2018342869-A1
Application number	US-201715760925-A
Country	US
Kind code	A1
Filing date	Jan 10, 2017
Priority date	Oct 26, 2016
Publication date	Nov 29, 2018
Grant date	—

Abstract

An alternating current/direct current home smart micro-grid coordination system is provided, which includes an alternating current power quality screening modulator, a direct current power quality screening modulator and a power coordination module, where the power coordination module is configured to receive parameters of buses detected by the alternating current power quality screening modulator and the direct current power quality screening modulator, perform optimization calculation to obtain optimal solutions of a voltage on the power quality-insensitive load alternating current bus and a voltage on the power quality-insensitive load direct current bus, and issue an instruction to control the alternating current power quality screening modulator and the direct current power quality screening modulator to adjust the voltage on the power quality-insensitive load alternating current bus and the voltage on the power quality-insensitive load direct current bus.

First claim

1 . An alternating current/direct current home smart micro-grid coordination system, comprising:
an alternating current power quality screening modulator, a direct current power quality screening modulator, and a power coordination module, wherein an alternating current bus is connected to a power quality-insensitive load alternating current bus via the alternating current power quality screening modulator; a direct current bus is connected to a power quality-insensitive load direct current bus via the direct current power quality screening modulator; the alternating current power quality screening modulator and the direct current power quality screening modulator are connected to the power coordination module; and the power coordination module is configured to receive parameters of buses detected by the alternating current power quality screening modulator and the direct current power quality screening modulator, perform optimization calculation to obtain optimal solutions of a voltage on the power quality-insensitive load alternating current bus and a voltage on the power quality-insensitive load direct current bus, and issue an instruction to control the alternating current power quality screening modulator and the direct current power quality screening modulator to adjust the voltage on the power quality-insensitive load alternating current bus and the voltage on the power quality-insensitive load direct current bus.

2 . The alternating current/direct current home smart micro-grid coordination system according to claim 1 , further comprising a power storage module which is connected to the direct current power quality screening modulator.

3 . The alternating current/direct current home smart micro-grid coordination system according to claim 1 , wherein
the power quality-insensitive load alternating current bus is connected to an alternating current power quality-insensitive load; the power quality-insensitive load direct current bus is connected to a direct current power quality-insensitive load; the alternating current bus is connected to an alternating current power quality-sensitive load; and the direct current bus is connected to a direct current power quality-sensitive load.

4 . An alternating current/direct current home smart micro-grid system, comprising:
an alternating current/direct current home smart micro-grid coordination system, an alternating current bus, an alternating current subnet, a direct current bus, a direct current subnet, a new energy direct current subnet, and a bi-directional impedance AC/DC converter module, wherein the alternating current/direct current home smart micro-grid coordination system comprises an alternating current power quality screening modulator, a direct current power quality screening modulator and a power coordination module; the alternating current bus is connected to a power quality-insensitive load alternating current bus via the alternating current power quality screening modulator; the direct current bus is connected to a power quality-insensitive load direct current bus via the direct current power quality screening modulator; the alternating current power quality screening modulator and the direct current power quality screening modulator are connected to the power coordination module; the power coordination module is configured to receive parameters of buses detected by the alternating current power quality screening modulator and the direct current power quality screening modulator, perform optimization calculation to obtain optimal solutions of a voltage on the power quality-insensitive load alternating current bus and a voltage on the power quality-insensitive load direct current bus, and issue an instruction to control the alternating current power quality screening modulator and the direct current power quality screening modulator to adjust the voltage on the power quality-insensitive load alternating current bus and the voltage on the power quality-insensitive load direct current bus; the alternating current subnet comprises an alternating current power quality-sensitive load, an alternating current power quality-insensitive load and the alternating current power quality screening modulator; the direct current subnet comprises a direct current power quality-sensitive load, a direct current power quality-insensitive load and the direct current power quality screening modulator; the alternating current bus is connected to a mains supply and the alternating current subnet; the direct current bus is connected to the new energy direct current subnet and the direct current subnet; and the alternating current bus is connected to the direct current bus via the bi-directional impedance AC/DC converter module.

5 . The home smart micro-grid system according to claim 4 , wherein the new energy direct current subnet is a combination of new energy direct current modules, which comprise a photovoltaic module and a wind power module.

6 . The home smart micro-grid system according to claim 4 , wherein the mains supply is connected to the alternating current bus via an anti-islanding switch.

7 . An operation method of a home smart micro-grid system, performed by the home smart micro-grid system according to claim 4 , wherein the operation method comprises:
receiving, by the power coordination module, voltage and current parameters of the alternating current bus and voltage and current parameters of the power quality-insensitive load alternating current bus detected by the alternating current power quality screening modulator, as well as voltage and current parameters of the direct current bus and voltage and current parameters of the power quality-insensitive load direct current bus detected by the direct current power quality screening modulator; performing, by the power coordination module, optimization calculation based on the voltage and current parameters of the alternating current bus, the voltage and current parameters of the power quality-insensitive load alternating current bus, the voltage and current parameters of the direct current bus, and the voltage and current parameters of the power quality-insensitive load direct current bus, to obtain optimal solutions of the voltage on the power quality-insensitive load alternating current bus and the voltage on the power quality-insensitive load direct current bus; and adjusting, by the power coordination module based on the optimal solutions, the voltage on the power quality-insensitive load alternating current bus with the alternating current power quality screening modulator, and the voltage on the power quality-insensitive load direct current bus with the direct current power quality screening modulator.

8 . The operation method of a home smart micro-grid system according to claim 7 , wherein the performing the optimization calculation comprises:
performing the optimization calculation with minimization of a sum of power losses of the alternating current power quality screening modulator, the direct current power quality screening modulator and the bi-directional impedance AC/DC converter as an optimization target, and the home smart micro-grid system being purely resistive and being maintained at constant power in a time-division manner with respect to a mains supply, and 100% of new energy being connected to a power grid as constraint conditions.

9 . The operation method of a home smart micro-grid system according to claim 7 , wherein the home smart micro-grid system further comprises the power storage module, and the operation method of a home smart micro-grid system comprises:
receiving, by the power coordination module, the voltage and current parameters of the alternating current bus and the

Assignees

• Univ Guangdong Technology

Inventors

• Zhang Yun
• Zhang Guidong
• Chen Sizhe

Classifications

• H02J4/25

  for transfer of electric power between AC and DC networks, e.g. for supplying the DC section within a load from an AC mains system · CPC title

• H02J3/0014

  for preventing or reducing power oscillations in networks · CPC title

• H02J3/28

  Arrangements for balancing of the load in networks by storage of energy · CPC title

• H02J3/381

  Dispersed generators · CPC title

• H02J3/02 Primary

  using a single network for simultaneous distribution of AC power at different frequencies · CPC title