A hierarchical voltage control system and method based on equivalent voltage drop index

Abstract

The invention discloses an equivalent voltage drop indexes-based layered voltage control system, which comprises a substation-oriented-level regional coordinated voltage controller and a feeder-oriented-level local voltage controller, wherein the local voltage controller estimates voltage distribution in a feeder on the basis of limited amount measurement, and calculates equivalent voltage drop indexes on the basis of the voltage distribution; after the voltage exceeds the limit, the local voltage controller determines the input condition of reactive power equipment in the region on the basis of the voltage estimation result and the equivalent voltage drop indexes; and if regulation is unsuccessful, assistant regulation is carried out by use of the regional coordinated voltage controller to achieve voltage out-of-limit recovery. Meanwhile, the invention further discloses a control method corresponding to the system. By the method and the system, the characteristic that a power distribution network is short of an observable point is comprehensively considered, and fast and high-efficiency power distribution network voltage control is achieved by full use of a distributed power supply and reactive power regulation equipment in the power distribution network on the basis of the equivalent voltage drop indexes.

Description

technical field [0001] The invention relates to the technical field of smart grid voltage control, in particular to a layered voltage control system and method based on an equivalent voltage drop index. Background technique [0002] Intermittent energy access in the distribution network puts forward higher requirements for voltage control. At the same time, the addition of controllable elements such as controllable distributed power sources, energy storage devices, and new DFACTs equipment has increased the power distribution network to a considerable extent. The complexity of grid voltage control challenges the existing control methods. The IEEE1547 standard stipulates the longest action time for cutting off the distributed power supply when the output voltage fluctuates. In order to make the distributed power supply better play its benefits and try to avoid its quitting operation when the voltage fluctuates, a higher level of control is required to comprehensively utilize ...

AI Technical Summary

Problems solved by technology

[0007] However, there are considerable constraints in the three technologies mentioned at this stage. Distributed voltage control, as a voltage control method based on local information, can easily lead to errors due to the inability to consider the impact of voltage rise brought by distributed power sources after the distributed power sources are connected. action

Centralized voltage control based on voltage over-limit recovery, it is difficult to choose the action dead zone range

If the sensitivity is too high, the equipment will vibrate repeatedly. If the dead zone is set too large, it will cause some intermittent energy fluctuations to cause short-term voltage overruns and other situations that cannot be responded in time.

Centralized voltage control based on voltage optimization needs to add sensors, remote control, and arrange communication networks. At the same time, it must ensure the reliability of SCADA channels. It is quite difficult to implement in medium-voltage distribution networks with a low proportion of three remotes. considerable increase in control costs

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