System for use of static inverters in variable energy generation environments
First Claim
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1. A energy generation system, comprising:
- one or more strings of variable energy collectors;
one or more string converters managed by a first controller to combine voltage outputs of the one or more strings of variable energy collectors into an energy output stream;
a bus configured to route the energy output stream;
a static inverter to which the bus routes the energy output stream, the static inverter comprising;
switches for converting the electrical energy output to an alternating current; and
a transformer arrangement comprising a transformer and a balancing transformer to convert the alternating current to an alternating current with a given voltage; and
a second controller configured to receive measurements of voltage phase on a grid and control timing of the switches in accordance with the measurements of the voltage phase.
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Abstract
A system to collect energy from generation systems such as, for example, wind farms or solar farms with widely distributed energy-generation equipment. In some cases, static inverters are used to feed the energy directly into the power grid. In some other cases, back-to-back static inverters are used create a high-voltage DC transmission line to collect power from multiple generation sites into one feed-in site.
169 Citations
20 Claims
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1. A energy generation system, comprising:
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one or more strings of variable energy collectors; one or more string converters managed by a first controller to combine voltage outputs of the one or more strings of variable energy collectors into an energy output stream; a bus configured to route the energy output stream; a static inverter to which the bus routes the energy output stream, the static inverter comprising; switches for converting the electrical energy output to an alternating current; and a transformer arrangement comprising a transformer and a balancing transformer to convert the alternating current to an alternating current with a given voltage; and a second controller configured to receive measurements of voltage phase on a grid and control timing of the switches in accordance with the measurements of the voltage phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An energy generation system, comprising:
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one or more variable energy collecting units producing respective direct current (DC) voltage levels; a bus; a first controller in communication with the units to enable the DC voltage levels to be compatible on the bus, a static inverter to which the bus delivers a DC compatible voltage level, wherein the static inverter converts the DC compatible voltage level to an alternating current; a pulse width modulation inverter to receive an alternating current output of the static inverter; and a second controller in communication with the static inverter and the pulse width modulation inverter to control the alternating current output from the static inverter to the pulse width modulation inverter. - View Dependent Claims (11, 12, 13)
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14. A energy generation system, comprising:
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one or more variable energy collecting units to produce direct current (DC); a bus; a controller in communication with the units to maintain a desired voltage on the bus; a first static inverter to which the bus delivers the DC, wherein the first static inverter converts the DC received from the bus to an alternating current; and a second static inverter configured to receive the alternating current provided by the first static inverter and convert the alternating current received from first static inverter to a high voltage direct current. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification