Power system with method for adding multiple generator sets
First Claim
1. A method of operating a power system, the power system including a plurality of generator sets and a bus, each generator set including at least a generator and an engine, the method comprising:
- monitoring at least one generator set that is disconnected from the bus;
monitoring the bus;
supplying, to a control device, information associated with the operating state of each of the generator sets and information associated with the bus;
determining a relative frequency mismatch between the frequency of the bus and the frequency of the generator;
multiplying the relative frequency mismatch between the frequency of the bus and the frequency of the generator by a first weight factor to generate a frequency speed bias for the generator set;
determining a relative phase mismatch between the phase of the bus and the phase of the generator;
multiplying the relative phase mismatch between the phase of the bus and the phase of the generator by a second weight factor to generate a phase speed bias for the generator set;
adding the frequency speed bias and the phase speed bias to form a total speed bias; and
connecting the generator set to the bus when the voltage, frequency, and phase of the generator are within a permissible range of the voltage, frequency, and phase of the bus.
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Accused Products
Abstract
A method of operating a power system is provided. The power system has a plurality of generator sets and a bus. The method monitors the bus and generator sets disconnected from the bus. The method supplies to a control device information associated with the operating state of each of the generator sets and the bus. The method determines a relative frequency mismatch, multiplied by a first weight factor, and a relative phase mismatch, multiplied by a second weight factor, between the frequency and phase of the bus and a generator, and generates a frequency speed bias and a phase speed bias for the generator. The method adds the frequency and phase speed biases to form a total speed bias and connects the generator to the bus when the voltage, frequency, and phase of the generator are within a permissible range of the bus.
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Citations
20 Claims
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1. A method of operating a power system, the power system including a plurality of generator sets and a bus, each generator set including at least a generator and an engine, the method comprising:
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monitoring at least one generator set that is disconnected from the bus; monitoring the bus; supplying, to a control device, information associated with the operating state of each of the generator sets and information associated with the bus; determining a relative frequency mismatch between the frequency of the bus and the frequency of the generator; multiplying the relative frequency mismatch between the frequency of the bus and the frequency of the generator by a first weight factor to generate a frequency speed bias for the generator set; determining a relative phase mismatch between the phase of the bus and the phase of the generator; multiplying the relative phase mismatch between the phase of the bus and the phase of the generator by a second weight factor to generate a phase speed bias for the generator set; adding the frequency speed bias and the phase speed bias to form a total speed bias; and connecting the generator set to the bus when the voltage, frequency, and phase of the generator are within a permissible range of the voltage, frequency, and phase of the bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power system, comprising:
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a bus; a plurality of generator sets operable to supply electricity to an electric power load; a generator set including at least a generator and an engine; a frequency speed bias circuit, configured to input a voltage waveform from the generator, input a voltage waveform from the bus, generate a relative frequency mismatch, multiply the relative frequency mismatch by a first weight factor, and output a frequency speed bias from a first PID controller; a phase speed bias circuit, configured to input a voltage waveform from the generator, input a voltage waveform from the bus, generate a signal proportional to a phase error between the generator and the bus, multiply the signal proportional to the phase error between the generator and the bus by a second weight factor, and output a phase speed bias from a second PID controller; a total speed bias circuit, configured to add the frequency speed bias and the phase speed bias to form a total speed bias; and a generator breaker configured to connect the generator to the bus when the voltage, frequency, and phase of the generator are within a permissible range of the voltage, frequency, and phase of the bus. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A power system, comprising:
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a bus; a plurality of generator sets operable to supply electricity to an electric power load; a generator set including at least a generator and an engine; a synchronization and load sharing control, comprising; a frequency speed bias circuit, including a bandpass filter, a hard limiter, an integrator which resets on leading edge, a hold block, a summer, a first weight factor multiplier, and a first PID controller, the frequency speed bias circuit outputting a frequency speed bias; a phase speed bias circuit, including a bandpass filter, a hard limiter, an integrator which resets on leading edge, a first logic function block, a hold block, a leading edge detector, a second logic function block, a second weight factor multiplier, and a second PID controller, the phase speed bias circuit outputting a phase speed bias; a total speed bias circuit, including a summer and a limiter, the total speed bias circuit outputting a total speed bias; and a generator breaker to connect the generator set to the bus when the voltage, frequency, and phase of the generator set are within a permissible range of the voltage, frequency, and phase of the bus. - View Dependent Claims (19, 20)
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Specification