Photovoltaic power generation apparatus and control method thereof
First Claim
1. A photovoltaic power generation apparatus comprising:
- plural solar battery arrays, each of which is constructed by plural solar battery modules; and
plural power converters, each of which is connected to one of said plural solar battery arrays, for converting direct-current power generated by said plural solar battery arrays to alternating-current power so as to provide the alternating-current power to a commercial power system, wherein each of said plural power converters comprises a detector for detecting an abnormal state of output of the alternating-current power of said each of the plural power converters to suspend power conversion operation of said each of the plural power converters, and operation suspension timing of at least one of said plural power converters is earlier than the others.
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Abstract
A photovoltaic power generation apparatus having a plurality of power converters, respectively connected to a plurality of solar battery arrays, for converting direct-current power generated by the solar battery arrays to alternating-current power so as to provide the alternating-current power to a commercial power system. The photovoltaic power generation apparatus is so constructed that the plurality of power converters do not simultaneously suspend operation when an abnormal state is detected, in order to prevent generation of an electrical stress or reduction of the power generation amount caused by simultaneous operation suspension of the power converters or repeated operation suspension and operation resume. When the power generation amount of each solar battery array is different, a power converter connected to the solar battery array of the smallest power generation amount is set in the first-to-suspend condition.
275 Citations
12 Claims
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1. A photovoltaic power generation apparatus comprising:
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plural solar battery arrays, each of which is constructed by plural solar battery modules; and
plural power converters, each of which is connected to one of said plural solar battery arrays, for converting direct-current power generated by said plural solar battery arrays to alternating-current power so as to provide the alternating-current power to a commercial power system, wherein each of said plural power converters comprises a detector for detecting an abnormal state of output of the alternating-current power of said each of the plural power converters to suspend power conversion operation of said each of the plural power converters, and operation suspension timing of at least one of said plural power converters is earlier than the others. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A controlling method of a photovoltaic power generation apparatus having:
- plural solar battery arrays, each of which is constructed by plural solar battery modules; and
plural power converters, each of which is connected to one of said plural solar battery arrays, for converting direct-current power generated by said plural solar battery arrays to alternating-current power so as to provide the alternating-current power to a commercial power system, said method comprising the steps of;detecting an abnormal state of output of the alternating-current power of each of the plural power converters; and
suspending power conversion operation of each of the plural power converters when the abnormal state is detected, wherein operation suspension timing of at least one of said plural power converters is earlier than the others. - View Dependent Claims (12)
measuring a voltage of the output of the alternating-current power; and
detecting the abnormal state based on the measured voltage, wherein said detecting step detects the abnormal state when the measured voltage reaches or exceeds a set value because of a rise of a voltage of the commercial power system.
- plural solar battery arrays, each of which is constructed by plural solar battery modules; and
Specification