METHOD AND DEVICE TO SUPPLY TO LOADS FED FROM LONG-HAUL POWER TRANSMISSION LINES Russian patent published in 2011 - IPC H02J3/20 

FIELD: electricity.

SUBSTANCE: in the method of the proposed invention, a point is identified on the power transmission line, which is nearest to the point of the main power supply source connection, where voltage loss as all electric loads are connected and operate under full load equals two values of its limit permissible value, and in this point the power is supplied from the first additional source of power supply. Then, based on the condition of joint operation of the main and the first additional sources of power supply, the second point is identified on the power transmission line, which is nearest to the point of connection of the main power supply source, where voltage loss as all the electric loads are connected and operate at the full load equals to two values of limit permissible value, and in this point the power is supplied from the second additional source of power supply, then, acting in the same manner, moving further along the whole length of the power transmission line till its end, one by one all the points are detected: the third one, the fourth one, …, N, in which the voltage loss as all the power loads are connected, and one additional power supply source is added at each stage, equals two values of the limit permissible value, and in each of these points the power is accordingly supplied from the third, …, N additional sources of power supply (a resonant single-conductor power supply system), at the same time capacity of all electric loads is distributed among the main and additional sources of power supply. Besides, if the load drops on a certain section of the power transmission line, the power supply sources that are nearest to this section are switched off, and in case of deviations of power quality parameters (voltage and frequency) on additional power supply sources from values of these parameters on the main source of power supply, such deviations are eliminated by control of parameters of additional power supply sources, where deviations are registered, for this purpose amplitude and frequency of supply voltage are measured, the succession of phases is detected at each additional power supply source. At the same time if frequencies in points of their measurement differ by more than 0.1%, amplitudes in points of their measurement differ by more than 0.5%, and succession of phases in these points differs, these parameters on the additional power supply source are modified to match their values on the main source of power supply. The other subject matter of the invention - the device - comprises the first, second, …, N additional sources of power supply, sensors to monitor voltage amplitude, sensors to monitor voltage frequency, a device to monitor succession of voltage phases in the main source of voltage, the first, second, third, …, N additional sources of power supply, a system to control parameters of power supply sources, units to disconnect the main, first, second, third, …, N additional power supply sources, units to identify power consumers load, units to transfer information on power consumers load into the system of power supply control and a unit to receive information on the power consumers load by the system of power supply sources control.

EFFECT: reduced power losses in a power transmission line, increased efficiency factor and reliability of a power supply system, reduced cost of power supply.

2 cl, 1 dwg