The configuration method for the balanced distribution of the voltage and load of the busbars of the 110kV system

Abstract

The invention discloses a voltage load balanced distribution configuration mode of 110 kV system buses in an intelligent substation double-bus wiring mode. Intervals of odd numbers are cascaded from a 110 kV I segment bus merging unit, and intervals of even numbers are cascaded from a 110 kV II segment bus merging unit. The 110 kV I segment bus merging unit, and protection, measurement and control of the line intervals of the odd numbers, and intelligent assemblies are hooked to a I segment direct current power supply; the 110 kV II segment bus merging unit, and protection, measurement and control of the line intervals of the even numbers, and intelligent assemblies are hooked to a II segment direct current power supply; and voltage cascaded optical cable loops of the 110 kV line intervals of the even numbers are adjusted. According to the invention, no equipment and material need to be added, the cascaded optical cable loops of partial intervals are adjusted, and the configuration of voltage virtual terminals corresponding to the intervals are modified, so that the difficult matching between protection and setting caused by faults of the I segment bus merging unit is avoided.

Description

technical field [0001] The invention relates to a voltage configuration scheme for a 110 kV system, in particular to a configuration method for balanced distribution of bus voltage loads in a 110 kV system in an intelligent substation double bus connection mode. Background technique [0002] As we all know, the bus PT of the double-bus connection mode supplies power to multiple devices at multiple intervals at the same time. Once a fault occurs, the impact will be huge, the coordination of regional protection settings will be deteriorated, and it may even cause a large number of devices in the power grid to refuse to operate or trip over the level. In recent years, with the accelerated construction and continuous operation of smart substations, merging units and smart terminals have been widely used to change the traditional substation output and output mode research and development and design concepts. At present, all 110kV single-configuration protection and safety automat...

AI Technical Summary

Problems solved by technology

The main problems in the existing bus configuration scheme are as follows: 1) 110kVI section bus merging unit equipment failure, resulting in the loss of all 110kV line interval voltages cascaded with its bus voltage, distance protection and fast section zero-sequence protection with directional elements. If it is blocked, only long-time PT disconnection overcurrent protection and zero-sequence protection (generally setting action time is 3~4 seconds) are retained. Any line or component failure in this power grid operation mode is bound to be caused by the difficulty of protection setting coordination. Leapfrog action, expand the fault range, and may even cause multiple lines to trip at the same time

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