The aim of the invention is to use a separate device between the analog and digital communications lines to convert the digital load sharing information from the digital communication line to the analog communication line and vice versa. The device does not generate power itself for the load sharing
The aim of the invention is to use a separate device between the analog and digital communications lines to convert the digital load sharing information from the digital communication line to the analog communication line and vice versa. The device does not generate power itself for the load sharing and therefore does not disturb the load sharing of the generators on the both sides of the device. The device can be seen as a gate between the digital communication line and the analog communication line. The device simulates load situation of the generator/s connected to the digital communication line for load sharing with other generator/s connected to the analog communication line, and similarly it simulates load situation of the other generator/s connected to the analog communication line for load sharing with the generator/s connected to the digital communication line.
대표청구항▼
1. A load sharing arrangement to share power production among generators that are connectable to an electric power network, wherein the arrangement comprises a device, comprising: a first interface for a digital communication line;a second interface for a busbar breaker;a third interface to receive
1. A load sharing arrangement to share power production among generators that are connectable to an electric power network, wherein the arrangement comprises a device, comprising: a first interface for a digital communication line;a second interface for a busbar breaker;a third interface to receive measurements from a analog communication line;a fourth interface to send signals to the analog communication line;a fifth interface to control the sending of the signals through the fourth interface;means for simulating load situation of generators connected to the digital communication line for load sharing with other generators connected to the analog communication line, and for simulating load situation of the other generators connected to the analog communication line for load sharing with the generators connected to the digital communication line;a first load sharing unit;a second load sharing unit; andat least one internal communication line between said load sharing units, which first load sharing unit is arranged to handle information from the second, third, fourth and fifth interfaces, and from the internal communication line, and further arranged to handle communication of the fourth interface by utilizing the fifth interface, and send information to the second load sharing unit through the internal communication line, the first load sharing unit comprising said means for simulating a virtual generator by calculating the load situations of generators, the second load sharing unit being arranged to form an identifier to the device and to handle communication through the first interface according to a protocol of digital communication line, and send/receive information through the internal communication line. 2. The arrangement according to claim 1, further comprising a switch connectable to the fourth interface and the analog communication line, the switch being also connectable to the fifth interface, which switch is arranged to be on for allowing the communication from the fourth interface to the analog communication line or off for preventing said communication from the fourth interface, the load sharing among the generators connected to the digital communication line and the other generators connected to the analog communication line being capable when the busbar breaker is switched on, and at least one of the generators is in a load sharing mode. 3. The arrangement according to claim 2, wherein said means for simulating are arranged to calculate said simulations in different cases in such a way that a virtual load of the device is determined to be: zero when the busbar breaker is on, the generators connected to the digital communication line fails to be in the load sharing mode and the switch is off;mean value of the generators being in the load sharing mode when the busbar breaker is on, at least one of the generators connected to the digital communication line is in the load sharing mode and the switch is off;a calculation value where the load situation of the generators, including the device, is equal with the load situation of the other generators when the busbar breaker is on, at least one of the generators connected to the digital communication line and at least one of the other generators connected to the analog communication line are in the load sharing mode and the switch is on. 4. The arrangement according to claim 3, wherein a state of change where the switch is turned from off to on, a delay is used when changing the virtual load from said mean value to said calculation value. 5. The arrangement according to claim 4, wherein the first load sharing unit is arranged to provide information to the second load sharing unit that is needed for the communication according to the digital protocol. 6. The arrangement according to claim 1, wherein a case where at least one generator or the other generator is transferring to the load sharing mode or from the load sharing mode, said busbar breaker being on, the first load sharing unit is arranged to utilize a ramp value for adjusting the load sharing to a new situation. 7. The arrangement according to claim 6, wherein the ramp value is power difference between the generator's powers after and before the transfer, which ramp value is arranged to be ramped to zero using a ramp rate. 8. The arrangement according to claim 7, wherein another ramp value is used when the busbar breaker is turned on, or when a first generator transfer into the load sharing mode, the other ramp value indicating difference of load situations between the generators and the other generators. 9. A load sharing method to share power production among generators that are connectable to an electric power network, wherein the method comprises simulating a virtual generator by calculating load situation of generators connected to a digital communication line for load sharing with other generators connected to a analog communication line; andsimulating load situation of the other generators connected to the analog communication line for load sharing with the generators connected to the digital communication line.
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이 특허에 인용된 특허 (2)
Ejzak Richard P. (Rockford IL) Thom James B. (Rock City IL) Peterson William J. (Rockford IL) Glennon Timothy F. (Rockford IL), Control for an electrical generating and distribution system, and method of operation.
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