An Online Voltage Control Method Cooperating with Multiple Types of Reactive Resources

Abstract

The invention proposes an online voltage control method for coordinating multiple types of reactive resources, which belongs to the technical field of operation control of electric power systems. This method first establishes the linearized power flow equation of branch reactive power, and then constructs an online voltage control model of multi-type reactive power resources composed of objective functions and constraints. The constraints include: generator reactive power output constraint, reactive power Compensator constraints, transformer tap gear constraints, node reactive power balance constraints, and node voltage constraints including relaxation; the model is solved to obtain the optimization results of voltage control. The invention makes full use of the reactive power and voltage operating characteristics of the power grid, and constructs a practical online solution model for the reactive power and voltage control of the large power grid that cooperates with multiple reactive resources, and takes into account the safety of the power grid operation under the condition of acceptable accuracy loss performance, economy of reactive resource action, and high reliability of online operation.

Description

technical field [0001] The invention belongs to the technical field of operation control of electric power systems, and in particular relates to an online voltage control method for coordinating multiple types of reactive resources. Background technique [0002] Compared with traditional power sources, new energy sources such as wind and solar have strong fluctuations and uncertainties, and the access points are generally located at the end of the power grid, and the grid structure is relatively weak. It has become a key bottleneck factor restricting the safe grid integration of large-scale renewable energy. It is urgent to fully tap and utilize the reactive power and voltage resources of the power grid to improve the safety and economic operation level of the power grid to cope with the high proportion of new energy feed-in. Compared with traditional grid active frequency control (AGC), grid automatic voltage control (AVC) faces the following key challenges: (1) reactive po...

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Problems solved by technology

Compared with traditional grid active frequency control (AGC), grid automatic voltage control (AVC) faces the following key challenges: (1) reactive power-voltage operation has strong nonlinearity; Reactive power, there are also discrete reactive power such as capacitive reactors, transformer taps, etc., with different characteristics and difficult coordination; (3) There are many node voltage constraints that need to be satisfied, and unreasonable voltage constraints may cause the original problem to be unsolvable, which in turn affects Online running effect

[0003] The reactive power and voltage control of a large power grid coordinated with multiple reactive resources is essentially a large-scale nonlinear mixed integer programming problem, but there is currently no efficient and accurate solution method that can meet the requirements of online operation

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