초록 ▼

A voltage regulator system for regulating an output voltage of a genset includes a voltage regulator for reducing terminal voltage in response to a reduction in terminal frequency. A plurality of under-frequency roll-off (UFRO) states is provided in the voltage regulator, with each UFRO state being

A voltage regulator system for regulating an output voltage of a genset includes a voltage regulator for reducing terminal voltage in response to a reduction in terminal frequency. A plurality of under-frequency roll-off (UFRO) states is provided in the voltage regulator, with each UFRO state being configured to implement a UFRO characteristic. An operational signal indicative of an operating condition of the genset forms the basis for selection of the UFRO characteristic.

대표청구항 ▼

1. A voltage regulator system for regulating an output voltage of a genset including an engine and a generator, the voltage regulator system comprising: a voltage regulator comprising a plurality of under-frequency roll-off (UFRO) states, each UFRO state configured to implement a UFRO characteristic

1. A voltage regulator system for regulating an output voltage of a genset including an engine and a generator, the voltage regulator system comprising: a voltage regulator comprising a plurality of under-frequency roll-off (UFRO) states, each UFRO state configured to implement a UFRO characteristic for reducing terminal voltage in response to a reduction in terminal frequency, anda controller configured to receive an operational signal indicative of an operating condition of the genset for selection of a UFRO state based on the operational signal,wherein a first UFRO state of the plurality of UFRO states is selected when an engine coolant for the engine is in a hot condition and a second UFRO state of the plurality of UFRO states is selected when the engine coolant is in a cold condition. 2. The voltage regulator system of claim 1, wherein the operational signal is received from an electronic control unit. 3. The voltage regulator system of claim 1, wherein the first UFRO state implements a first UFRO characteristic of 1:1 V/Hz and the second UFRO state implements a second UFRO characteristic of 3:1 V/Hz. 4. The voltage regulator system of claim 1, wherein the first UFRO state and the second UFRO state are provided as separate modules. 5. The voltage regulator system of claim 1, wherein the engine coolant is in a hot condition when the engine coolant temperature is more than 70° C. and the engine coolant is in a cold condition when the engine coolant temperature is less than 70° C. 6. A genset comprising: an engine;a generator; anda voltage regulator system for regulating an output voltage of the genset, the voltage regulator system comprising: a voltage regulator comprising a plurality of under-frequency roll-off (UFRO) states, each UFRO state configured to implement a UFRO characteristic for reducing terminal voltage in response to a reduction in terminal frequency, anda controller configured to receive an operational signal indicative of an operating condition of the genset for selection of a UFRO state based on the operational signal;wherein a first UFRO state of the plurality of UFRO states is selected when an engine coolant for the engine is in a hot condition and a second UFRO state of the plurality of UFRO states is selected when the engine coolant is in a cold condition. 7. The genset of claim 6, wherein the first UFRO state implements a first UFRO characteristic of 1:1 V/Hz and the second UFRO state implements a second UFRO characteristic of 3:1 V/Hz. 8. A method for regulating an output voltage of a genset comprising an engine, a generator, and a voltage regulator system, the method comprising: monitoring an operational condition of the genset;sending an operational signal indicative of the operational condition to a controller configured to receive the operational signal;selecting an under-frequency roll-off (UFRO) state from a plurality of UFRO states of the voltage regulator system based on the operational signal, wherein a first UFRO state of the plurality of UFRO states is selected when an engine coolant for the engine is in a hot condition and a second UFRO state of the plurality of UFRO states is selected when the engine coolant is in a cold condition, each UFRO state being configured to implement a UFRO characteristic; andimplementing the UFRO characteristic for reducing terminal voltage in response to a reduction in terminal frequency. 9. The method of claim 8 wherein the first UFRO state implements a first UFRO characteristic of 1:1 V/Hz and the second UFRO state implements a second UFRO characteristic of 3:1 V/Hz.