POWER CONVERTER APPARATUS

• US 20130215652A1
• Filed: 03/18/2013
• Published: 08/22/2013
• Est. Priority Date: 09/22/2010
• Status: Active Grant

• Current Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation (Toshiba Corporation)
• Inventors: KOMATSU, 1, OHKAMI, Tomohisa, SOUDA, Manabu
• Granted Patent: US 9,350,261 B2
• Time in Patent Office: Days
• US Class Current: 363/37
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy wind motors F03D
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/48 Controlling the sharing of the in-phase component
• CPC Class Codes: H02M 5/458 using semiconductor devices only
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects

Abstract

There is provided a power converter apparatus including a detector detecting a system voltage, and a controller stably outputting power generated by the wind power generator to the power system based on a power instruction value and controlling an output voltage to stabilize the system voltage based on a voltage instruction value in a case where the system voltage is within a preset range, and controlling an active current component and a reactive current component of an output current to stabilize the system voltage of the power system by use of a voltage drop due to impedance of the power system in a case where the system voltage is outside the preset range.

Claims

1. A power converter apparatus that is applied to a wind power generation system and converts power generated by a wind power generator to alternating-current power supplied for a power system, the power converter apparatus comprising:

a system voltage detector configured to detect a system voltage of the power system; and

a controller configured to stably output power generated by the wind power generator to the power system based on a power instruction value from a higher level controller and to control an output voltage of the power converter apparatus to stabilize the system voltage of the power system based on an alternating-current voltage instruction value in a case where the system voltage detected by the system voltage detector is within a preset range, and configured to control an active current component and a reactive current component of an output current of the power converter apparatus to stabilize the system voltage of the power system by use of a voltage drop due to impedance of the power system in a case where the system voltage detected by the system voltage detector is outside the preset range.

2. The power converter apparatus according to claim 1, further comprising:

a converter configured to convert alternating-current power generated by the wind power generator to direct-current power, and

an inverter configured to convert the direct-current power converted by the converter to alternating-current power supplied for the power system.

3. The power converter apparatus according to claim 1, wherein the impedance is simulated by a resistance component and a reactance component.

4. The power converter apparatus according to claim 2, wherein the impedance is simulated by a resistance component and a reactance component.

5. The power converter apparatus according to claim 1, wherein the controller comprises:

a converter controller configured to calculate the power instruction value and to control the converter; and

an inverter controller configured to control the inverter based on the power instruction value calculated by the converter controller in a case where the system voltage is within the preset range.

6. The power converter apparatus according to claim 2, wherein the controller comprises:

a converter controller configured to calculate the power instruction value and to control the converter; and

an inverter controller configured to control the inverter based on the power instruction value calculated by the converter controller in a case where the system voltage is within the preset range.

7. The power converter apparatus according to claim 3, wherein the controller comprises:

a converter controller configured to calculate the power instruction value and to control the converter; and

an inverter controller configured to control the inverter based on the power instruction value calculated by the converter controller in a case where the system voltage is within the preset range.

8. A control method of controlling a power converter apparatus that is applied to a wind power generation system and converts power generated by a wind power generator to alternating-current power supplied for a power system, the control method comprising:

detecting a system voltage of the power system, and

stably outputting power generated by the wind power generator to the power system based on a power instruction value from a higher level controller and controlling an output voltage of the power converter apparatus to stabilize the system voltage of the power system based on an alternating-current voltage instruction value in a case where the system voltage detected is within a preset range, and controlling an active current component and a reactive current component of an output current of the power converter apparatus to stabilize the system voltage of the power system by use of a voltage drop due to impedance of the power system in a case where the system voltage detected is outside the preset range.