Operation control apparatus for solar power system

• US 10,033,189 B2
• Filed: 12/06/2013
• Issued: 07/24/2018
• Est. Priority Date: 06/07/2011
• Status: Active Grant

• Current Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation (Toshiba Corporation)
• Inventors: Fujii, Yosuke
• Primary Examiner(s): Finch, III, Fred E
• Assistant Examiner(s): BRUNER, LORENA D
• Application Number:
  US14/099,254
• Publication Number:
  US 20140092657A1
• Time in Patent Office: 1,691 Days
• Field of Search: 363 79, 323284
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02M 7/539 with automatic control of output wave form or frequency H02M7/5375 - H02M7/5387 take precedence
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers

Abstract

An operation control apparatus includes a criterion calculator that obtains an operation criterion for the power converter, based on the voltage detected by the above voltage detector on the side of the alternating-current power system, a direct-current voltage detector that detects a direct-current output voltage of the solar battery, and an operation determination device that compares the direct-current output voltage detected by the direct-current voltage detector with the operation criterion obtained by the criterion calculator, and supplies the power converter with an operation command if the direct-current output voltage is greater than the operation criterion.

Claims

1. An operation control apparatus for a solar power system that converts direct-current power from a solar battery into single-phase alternating-current power by a power converter, supplies an alternating-current power system with the single-phase alternating-current power converted, and comprises a switch at a link point between the power converter and the alternating-current power system, the operation control apparatus comprising:

a voltage detector that detects a single-phase alternating-current first voltage of the switch on a side the power converter, and a second voltage thereof on a side of the alternating-current power system;

a switch-on determination device that is input with the first and second voltages from the voltage detector on the sides of the power converter and the alternating-current power system, and supplies the switch with a switch-on command if both of the first and second voltages are approximately equal to each other;

a criterion calculator that obtains a voltage magnitude operation criterion for the power converter, by multiplying, by a margin, a moving average voltage of the magnitude of the second voltage detected by the voltage detector on the side of the alternating-current power system;

a direct-current voltage detector that detects a direct-current output voltage value of the solar battery; and

an operation determination device that compares the direct-current output voltage value detected by the direct-current voltage detector with the voltage magnitude operation criterion obtained by the criterion calculator, and supplies the power converter with a command to begin operation if the direct-current output voltage value is greater than the voltage magnitude operation criterion.

2. An operation control apparatus for a solar power system that converts direct-current power from a solar battery into a three-phase alternating-current power by a power converter, supplies an alternating-current power system with the three-phase alternating-current power converted, and comprises a switch at a link point between the power converter and the alternating-current power system, the operation control apparatus comprising:

a voltage detector that detects a first voltage of the switch on a side of the power converter, and a second voltage thereof on a side of the alternating-current power system;

a switch-on determination device that is input with the first and second voltages from the voltage detector on the sides of the power converter and the alternating-current power system, and supplies the switch with a switch-on commend if both of the first and second voltages are approximately equal to each other;

a criterion calculator that obtains a voltage magnitude operation criterion for the power converter, by multiplying, by 1.35 and a margin, a moving average voltage of the magnitude of the second voltage detected by the voltage detector on the side of the alternating-current power system;

a direct-current voltage detector that detects a direct-current output voltage value of the solar battery; and

an operation determination device that compares the direct-current output voltage value detected by the direct-current voltage detector with the voltage magnitude operation criterion obtained by the criterion calculator, and supplies the power converter with a command to begin operation if the direct-current output voltage value is greater than the voltage magnitude operation criterion.