DC voltage regulator
First Claim
1. A turbine generator DC bus voltage regulator system, comprising:
- a power converter circuit that includes a converter component and a line inverter component with a DC bus junction situated between the converter component and the line inverter component configured to process power generated by an electrical power generation system;
a voltage regulator control board configured to detect a shift in the DC Bus voltage away from normal operational values during a voltage irregularity and maintain overvoltage regulation operational characteristics for the DC bus junction during the voltage irregularity, and further comprising;
an input element configured to determine a value of the DC bus junction voltage,an overvoltage regulation component configured to determine and generate an overvoltage regulation reference signal based on a nominal operating value of the DC bus junction voltage and an overvoltage operating voltage range, anda proportional plus integral controller component configured to process the difference between an overvoltage reference signal and the DC bus junction voltage and to generate a proportional plus integral controller output signal;
a comparator component configured to continuously modulate the pulse width of a switching signal applied to the switching device during the voltage irregularity by comparing a signal based on the proportional plus integral controller output signal to a periodic waveform, to maintain the DC bus voltage within an operating range centered around the overvoltage regulation reference signal for the duration of the voltage irregularity;
a switching device connected to an output from the comparator component and a negative side of the DC bus junction;
a resistor connected in series between the switching device and a positive side of the DC bus junction configured to facilitate continuously modulated power dissipation in coordination with the switching device during the voltage irregularity and maintain overvoltage operational characteristics including an overvoltage reference operational voltage value; and
a flyback diode connected in parallel to the resistor with the cathode of the diode connected to the positive side of the DC bus junction.
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Accused Products
Abstract
The disclosure details implementations of apparatuses, methods, and systems for regulating DC bus voltages. In an implementation, the system is configured to regulate the DC bus voltage directly by operating at the DC bus rather than indirectly on the AC side of the DC bus. In one implementation, the DC voltage regulator is configured with components including a DC voltage regulator power control board, a switching device, a resistor, and a flyback diode. In one non-limiting implementation example, the DC voltage regulator may be used to control the DC bus voltage of a doubly fed induction generator of a wind turbine. In this implementation, the DC voltage regulator effectively protects the converter of the induction generator and also reduces the transient torques on the generator shaft during voltage irregularities. This, in turn, reduces excessive wear on the wind turbine gearbox by limiting fatigue loads on the gear teeth that may result from transient torques.
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Citations
38 Claims
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1. A turbine generator DC bus voltage regulator system, comprising:
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a power converter circuit that includes a converter component and a line inverter component with a DC bus junction situated between the converter component and the line inverter component configured to process power generated by an electrical power generation system; a voltage regulator control board configured to detect a shift in the DC Bus voltage away from normal operational values during a voltage irregularity and maintain overvoltage regulation operational characteristics for the DC bus junction during the voltage irregularity, and further comprising; an input element configured to determine a value of the DC bus junction voltage, an overvoltage regulation component configured to determine and generate an overvoltage regulation reference signal based on a nominal operating value of the DC bus junction voltage and an overvoltage operating voltage range, and a proportional plus integral controller component configured to process the difference between an overvoltage reference signal and the DC bus junction voltage and to generate a proportional plus integral controller output signal; a comparator component configured to continuously modulate the pulse width of a switching signal applied to the switching device during the voltage irregularity by comparing a signal based on the proportional plus integral controller output signal to a periodic waveform, to maintain the DC bus voltage within an operating range centered around the overvoltage regulation reference signal for the duration of the voltage irregularity; a switching device connected to an output from the comparator component and a negative side of the DC bus junction; a resistor connected in series between the switching device and a positive side of the DC bus junction configured to facilitate continuously modulated power dissipation in coordination with the switching device during the voltage irregularity and maintain overvoltage operational characteristics including an overvoltage reference operational voltage value; and a flyback diode connected in parallel to the resistor with the cathode of the diode connected to the positive side of the DC bus junction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 38)
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23. A method of regulating a turbine generator DC bus voltage with a DC crowbar controller, comprising:
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determining a value of the DC bus voltage; determining a value of an overvoltage regulation reference signal voltage; generating the overvoltage regulation reference voltage at the determined value; and regulating the value of the DC bus voltage by processing, via a proportional plus integral controller, the difference between an overvoltage reference signal and the DC bus junction voltage and generating a proportional plus integral controller output signal, and continuously modulating, via comparator, the pulse width of a switching signal applied to a switching device during a voltage irregularity by comparing a signal based on the proportional plus integral controller output signal to a periodic waveform, to maintain the DC bus voltage within an operating range centered around the overvoltage regulation reference voltage for the duration of the voltage irregularity. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification