Method and apparatus for parallel engine generators
View Patent ↗A method and apparatus for paralleling engine generators. One or more closed transition transfer switches (CTTSes) are coupled to two or more engine generators. A system controller is programmed to operate the one or more CTTSes so that each of the generators provides an emergency power and so that the generators may simultaneously supply emergency power to the power bus.
1. A method for controlling a first and a second emergency generator, the method comprising the steps of:
providing a system controller comprising a central processing unit (CPU) programmed to control the first and second emergency generator;
coupling the system controller to a first dual operated transfer switch (TS) for controlling the operation of the first and the second emergency generator;
utilizing the first dual operated TS to route a first emergency power from the first emergency generator to a common power bus, wherein the common power bus is provided between the first dual operated TS and an automatic transfer switch (ATS); and
utilizing the system controller and the first dual operated TS to route a second emergency power from the second emergency generator to the common power bus while the first emergency power from the first emergency generator is also supplied to the common power bus.
2. The method as in claim 1 , further comprising the step of:
waiting for an output voltage waveform of the second emergency power to match with a voltage waveform associated with an output power before the system controller uses the first dual operated TS to route the second emergency power.
3. The method as in claim 1 , further comprising the steps of:
providing said automatic transfer switch (ATS) and
utilizing an output power of the common power bus as an emergency power, wherein the common power bus is coupled to an emergency power input of said ATS.
4. The method as in claim 1 , further comprising the step of:
providing programmed instructions to the system controller for routing the first and second emergency powers.
5. The method as in claim 1 , further comprising the step of:
supplying the first emergency power from the first emergency generator; and
supplying the second emergency power from the second emergency generator.
6. An apparatus for controlling a plurality of emergency generators, the circuit comprising:
a first dual operated transfer switch (TS) comprising:
a first input for coupling to a first generator;
a second input for coupling to a second generator;
a load output for coupling to a common power bus; and
a system controller comprising a central processing unit (CPU) programmed to control the first and the second generator and communicatively coupled with the first dual operated TS,
wherein the system controller is programmed to route both of the first and second inputs to the common power bus so that both of the first and second inputs simultaneously supply power to the common power bus, wherein the common power bus is provided between the first dual operated TS and an automatic transfer switch (ATS).
7. The circuit as in claim 6 , wherein the system controller is further programmed to wait for an output voltage waveform of the second generator to match with an output voltage waveform of the first generator before routing the second input to the common power bus.
8. The circuit as in claim 7 , further comprising
a second TS, the TS comprising a first input coupled to the second input of the first dual operated TS, a second input for coupling to a utility power source, and a load output for coupling to the common power bus.
9. The apparatus of claim 6 , wherein
the automatic transfer switch (ATS) comprises an emergency power input for coupling to the common power bus, a utility input for coupling to a utility power source, and a load output for coupling to the circuit load.
10. A method for controlling a first and a second emergency generator, the method comprising the steps of:
providing a first dual operated transfer switch (TS) comprising first and second inputs and a load output, wherein the first input is coupled to a first generator, the second input is coupled to a second generator, and the load output is coupled to an emergency power input of an automatic transfer switch (ATS) via a common power bus that is provided between the first dual operated TS and the ATS;
under operation of a system controller comprising a central processing unit (CPU) programmed to control the first and the second generators, toggling a first switch of the first dual operated TS so that the first generator supplies a first power to the common power bus;
the second generator matching a frequency associated with a power at the common power bus; and
toggling a second switch of the first dual operated TS so that the second generator supplies a second power to the common power bus.
11. The method as in claim 10 , further comprising the step of providing a second dual operated transfer switch, the second dual operated transfer switch comprising a third and a fourth input and a load output, wherein the third input is coupled to a third generator, the fourth input coupled to a fourth generator, and the load output is coupled to the common power bus.