Layered and distributed network voltage regulator control system and method based on active mechanism

Abstract

The invention discloses a layered and distributed network voltage regulator control system based on an active mechanism. The layered and distributed network voltage regulator control system based on the active mechanism comprises a reactive voltage controller which faces a single branch, a coordination voltage controller which faces a local area and an initiative power distribution network voltage management subsystem which faces a whole power distribution network. The initiative power distribution network voltage control subsystem determines a voltage control indicator according to a distribution condition of power distribution network active power. When a voltage is beyond a certain limit, the reactive voltage controller locally regulates the voltage which is beyond the certain limit. When the regulation fails, the coordination voltage controller is regulated on the basis of overall considering voltage fluctuations and a batch-type energy source grid connecting and grid separating plan, and voltage beyond limit recover based on the active mechanism is achieved through the coordination of the reactive voltage controller and the coordination voltage controller. Meanwhile, the invention further provides a regulating method which corresponds to the layered and distributed network voltage regulator control system based on the active mechanism. The layered and distributed network voltage regulator control system based on the active mechanism and the regulating method which corresponds to the layered and distributed network voltage regulator control system based on the active mechanism achieve active control of the beyond limit voltage of the power distribution network on the premise of meeting power distribution network constraint conditions.

Description

technical field [0001] The invention relates to the technical field of smart grid voltage control, in particular to an active mechanism-based hierarchical distributed distribution network voltage regulation system and method. [0002] Background technique [0003] In recent years, with the access of distributed energy resources (DER, Distributed Energy Resource), especially new renewable energy sources (RES, Renewable Energy Resources) such as wind energy and solar energy, the traditional radial distribution network with one-way flow of power flow has begun Gradually transforming into a complex network with two-way flow of currents. In view of this situation, the WG C6.19~WG C6.22 Working Group of the Power Distribution and Distributed Generation (C6) Technical Committee of the International Conference on Large Grids (CIGRE) proposed the concept of active distribution systems. The active distribution network is a system composed of micro-power sources, loads, energy storag...

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Problems solved by technology

[0007] However, there are considerable constraints in the two technologies mentioned at this stage. The "trigger" voltage control strategy has the obvious advantages of fast action speed and less resource consumption, but it is difficult to choose the dead zone range.

If the sensitivity is too high, the equipment will vibrate repeatedly. If the dead zone is set too large, it will lead to failure to respond in time when some voltages exceed the limit. Moreover, the core idea of ​​the "trigger" voltage control strategy is still passive and cannot be adapted to The characteristic of active distribution network "optimized control based on active mechanism"

The control strategy based on overall coordination needs to control the entire power grid, so it needs network topology information, real-time voltage values ​​of each node, distributed generation (DG, Distributed Generation), capacitors, and current status of on-load tap changer (OLTC) taps. The support of a large amount of data such as state and adjustable range will lead to excessive calculation and it is difficult to meet the real-time requirements

At the same time, there are far more controllable elements in the active distribution network than in the traditional distribution network, in which DG and reactive power compensation (SVC, Static Var Compensator) change continuously, while the states of capacitors and OLTC are discrete, so The overall coordination control problem is a very complex mixed integer programming problem, which brings great difficulties to the selection of algorithms

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