Power system having generator driven by engine

• US 7,235,891 B2
• Filed: 08/15/2003
• Issued: 06/26/2007
• Est. Priority Date: 02/16/2001
• Status: Expired due to Term

• Current Assignee: Omron Corporation, Yanmar Company Limited (Yanmar Holdings Co., Ltd.)
• Original Assignee: Yanmar Company Limited (Yanmar Holdings Co., Ltd.)
• Inventors: Nakamura, Kotaro, Mabuchi, Masao, Inoue, Kenichi, Tokiwa, Masayoshi, Toyoura, Nobuyuki, Okoba, Yasuyuki, Hibi, Shinji, Tanabe, Katsutaka
• Primary Examiner(s): Schuberg; Darren
• Assistant Examiner(s): Cuevas; Pedro J.
• Application Number:
  US10/641,030
• Publication Number:
  US 20040032127A1
• Time in Patent Office: 1,411 Days
• Field of Search: 290/10, 322/28, 363/61, 363/67, 363/69, 363/87, 363/89
• US Class Current: 290/10
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: H02M 5/458 using semiconductor devices only
• CPC Class Codes: H02M 7/493 the static converters being arranged for operation in parallel
• CPC Class Codes: H02P 9/00 Arrangements for controlling electric generators for the purpose of obtaining a desired output Ward-Leonard arrangements H02P7/34; vector control H02P21/00; feeding a network by two or more generators H02J; for charging batteries H02J7/14

Abstract

An apparatus for controlling the operation of power conditioners (10) for supplying the generated power to an external power system such as a commercial power system, in which power conditioners (10) are interconnected to an external power system, the power conditioners (10) are interconnected through information exchange means, at least one of the power conditioners (10) monitors the reverse power flow, and the power conditioners (10) exchange the monitor information with information of the other power conditioners (10), thereby equalizing the outputs of all the power conditioners (10). A generator (42) has armature windings (60), and an inverter circuit (13) of the power conditioner (10) provided for each of the armature windings (60) is controlled by cable or radio.

Claims

1. An electric power system for supplying alternating current electric power comprising:

a single generator driven by an engine;

a plurality of power generation sections disposed within the single generator, each power generation section including a plurality of armature windings;

a plurality of inverter circuits provided one for each of the respective armature windings;

an independent power generation electric wire connected to the downstream sides of the respective inverter circuits and connected to an external wire which connects an external alternating current electric power source to a consumer;

means for detecting alternating current (AC) voltage in the external wire;

means for detecting voltages outputted from the respective inverter circuits;

means for detecting currents outputted from the respective inverter circuits; and

a controller for controlling the respective inverter circuits based on the AC voltage in the external wire, the voltages in the respective inverter circuits, and the currents in the respective inverter circuits.

2. The electric power system as set forth in claim 1, further comprising:

means for detecting current in the external wire; and

a controller for calculating electric powers to be outputted from the respective inverter circuits based on the voltages in the respective inverter circuits and the currents in the respective inverter circuits, wherein a main controller communicates with the respective controllers, the main controller for the electric power in the external wire and the output power of the respective inverter circuits communicates with the respective controllers, and controls the respective inverter circuits based on the electric power in the external wire and the output electric powers of the respective inverter circuits so as to equalize the independent output electric powers of the respective inverter circuits.

3. The electric power system as set forth in claim 2, wherein the main controller controls the respective inverter circuits so as to make current in the external wire flow to the consumer.

4. The electric power system as set forth in claim 3, wherein the main controller communicates with each of the controllers through a line of multidrop connection.

5. A generation system including a plurality of the electric power systems according to claim 4, comprising:

system controllers for controlling start and stop of the respective electric power systems; and

a main system controller for calculating electric power of the external wire based on voltage and current in the external wire, wherein the main system circuit controller communicates with the respective system controllers and controls the respective systems based on the electric power in the external wire so as to equalize total operation status of the respective systems.

6. The electric power system as set forth in claim 2, wherein the main controller communicates with each of the controllers through a line of multidrop connection.

7. A generation system including a plurality of the electric power systems according to claim 6, comprising:

system controllers for controlling start and stop of the respective electric power systems; and

a main system controller for calculating electric power of the external wire based on voltage and current in the external wire, wherein the main system circuit controller communicates with the respective system controllers and controls the respective systems based on the electric power in the external wire so as to equalize total operation status of the respective systems.

8. A generation system including a plurality of the electric power systems according to claim 2, comprising:

system controllers for controlling start and stop of the respective electric power systems; and

a main system controller for calculating electric power of the external wire based on voltage and current in the external wire, wherein the main system circuit controller communicates with the respective system controllers and controls the respective systems based on the electric power in the external wire so as to equalize total operation status of the respective systems.

9. A generation system including a plurality of the electric power systems according to claim 3, comprising:

system controllers for controlling start and stop of the respective electric power systems; and

a main system controller for calculating electric power of the external wire based on voltage and current in the external wire, wherein the main system circuit controller communicates with the respective system controllers and controls the respective systems based on the electric power in the external wire so as to equalize total operation status of the respective systems.

10. A generation system including a plurality of the electric power systems according to claim 1, comprising:

system controllers for controlling start and stop of the respective electric power systems; and

a main system controller for calculating electric power of the external wire based on voltage and current in the external wire, wherein the main system circuit controller communicates with the respective system controllers and controls the respective systems based on the electric power in the external wire so as to equalize total operation status of the respective systems.

11. An electric power system comprising:

a single generator driven by an engine;

a plurality of armature windings disposed within the single generator;

inverter circuits provided to each of the respective armature windings;

an independent power generation electric wire connected to the downstream sides of the respective inverter circuits and connected to an external wire which connects an external electric power source to a consumer;

means for detecting voltage in the external wire;

means for detecting current in the external wire;

means for detecting voltages outputted from the respective inverter circuits;

means for detecting currents outputted from the respective inverter circuits;

a plurality of controllers for controlling the respective inverter circuits based on the voltage in the external wire, the voltages outputted from the respective inverter circuits, and the currents outputted from the respective inverter circuits; and

a main controller for the electric power in the external wire and the output powers of the respective inverter circuits, wherein the main controller calculates electric powers to be outputted from the respective inverter circuits based on the voltages outputted from the respective inverter circuits and the currents outputted from the respective inverter circuits, and wherein the main controller communicates with the respective controllers and controls the respective inverter circuits based on the electric power in the external wire and the output electric powers of the respective inverter circuits so as to equalize the independent output electric powers of the respective inverter circuits.

12. The electric power system as set forth in claim 11, wherein the main controller controls the respective inverter circuits so as to make current in the external wire flow to the consumer.

13. The electric power system as set forth in claim 12, wherein the main controller communicates with each of the controllers through a line of multidrop connection.

14. A generation system including a plurality of the electric power systems according to claim 11, comprising:

system controllers for controlling start and stop of the respective electric power systems; and

a main system controller for calculating electric power of the external wire based on voltage and current in the external wire, wherein the main system circuit controller communicates with the respective system controllers and controls the respective systems based on the electric power in the external wire so as to equalize total operation status of the respective systems.

15. An electric power system for supplying alternating current electric power comprising:

a single generator driven by an engine;

a plurality of armature windings disposed within the single generator;

a plurality of inverter circuits provided to each of the respective armature windings so as to convert electric power from the respective armature windings into alternating current power synchronized with an external electric power source;

an independent power generation electric wire connected to the downstream sides of the respective inverter circuits and connected to an external wire which connects the external alternating current electric power source to a consumer;

means for detecting alternating current (AC) voltage in the external wire;

means for detecting voltages outputted from the respective inverter circuits;

means for detecting currents outputted from the respective inverter circuits;

a plurality of controllers for controlling the respective inverter circuits based on the AC voltage in the external wire, the voltages in the respective inverter circuits, and the currents in the respective inverter circuits; and

a main controller for the electric power in the external wire and the output power of the respective inverter circuits, wherein the main controller communicates with the respective controllers, and controls the respective inverter circuits so as to equalize the independent output electric powers of the respective inverter circuits.