DC bus voltage control for two stage solar converter
First Claim
1. An apparatus for supplying AC power to an AC power grid from a DC power source, comprising:
- a converter coupled to the DC power source, said converter providing DC power to a DC bus;
an inverter coupled to said DC bus, said inverter converting the DC power of said DC bus into AC power; and
,a control system configured to regulate the DC bus voltage to be substantially equal to a variable DC bus voltage setpoint, said control system being configured to adjust the variable DC bus voltage setpoint based at least in part on the DC bus voltage of said DC bus.
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Accused Products
Abstract
Systems, methods, and apparatus for supplying AC power to an AC power grid from a DC power source, such as a photovoltaic (PV) array are disclosed. The systems and methods can include a converter coupled to the DC power source that provides DC power to a DC bus at a DC bus voltage. The systems and methods can further include an inverter coupled to the DC bus for converting the DC power of the DC bus to an output AC power. The systems and methods can further include a control system configured to regulate the DC bus voltage of the DC bus to operate at a variable DC bus voltage setpoint. The control system can adjust the DC bus voltage setpoint based at least in part on the DC bus voltage and the output AC current of the inverter.
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Citations
20 Claims
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1. An apparatus for supplying AC power to an AC power grid from a DC power source, comprising:
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a converter coupled to the DC power source, said converter providing DC power to a DC bus; an inverter coupled to said DC bus, said inverter converting the DC power of said DC bus into AC power; and
,a control system configured to regulate the DC bus voltage to be substantially equal to a variable DC bus voltage setpoint, said control system being configured to adjust the variable DC bus voltage setpoint based at least in part on the DC bus voltage of said DC bus. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for supplying AC power to an AC power grid from a DC power source, comprising:
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a boost converter coupled to the DC power source; a DC bus coupled to said boost converter, said boost converter providing DC power to said DC bus; an inverter coupled to said DC bus, said inverter configured to convert the DC power of said DC bus into AC power based at least in part on a modulation index; a monitoring system comprising a DC bus voltage sensor and an output AC current sensor, said DC bus voltage sensor providing a DC bus voltage feedback signal based on the DC bus voltage, said output AC current sensor providing an output AC current feedback signal based on the output AC current of said inverter; and
,a control system configured to control the DC bus voltage to be substantially equal to a variable DC bus voltage setpoint, said control system configured to adjust the variable DC voltage setpoint based at least in part on one of the DC bus voltage feedback signal or the AC current feedback signal so that the modulation index of said inverter remains substantially constant. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for controlling a DC bus voltage in a system for providing AC power to an AC power grid from a DC power source, said method comprising:
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providing DC power to a DC bus; converting the DC power on the DC bus to AC power with an inverter coupled to the DC bus, the inverter having an output AC current; controlling the DC bus voltage to be substantially equal to a DC bus voltage setpoint; and
,varying the DC bus voltage setpoint based in part on a DC bus voltage of the DC bus. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification