Three-dimensional coordinated electric network energy managing system and method for controlling and evaluating electric network

Abstract

The invention relates to a 3D-coordinated power grid energy management system and a power grid evaluation and control method, which belongs to the field of scheduling automation of power system. The system comprises a power grid model reconstruction sub-system, a power grid safety evaluation and alarm sub-system, an active frequency optimization control sub-system and a passive voltage optimization control sub-system, and a background calculation sub-system and a system foreground. The method comprises following steps: tracking isoline of an external power grid and automatically reconstructing a global power grid model; automatically executing online safety analysis integrated with static power grid, dynamic power grid, voltage stabilization, coordination of relay protection setting values, etc., and online recognizing the safety state of the power grid; alarming for normal unsafe condition, and carrying out prevention control; alarming for emergent conditions, and carrying out correction control calculation; and carrying out realtime active scheduling closed-loop control and passive voltage optimized closed-loop control under normal safety condition. The invention can achieve comprehensive and coordinated closed-loop control for the safety of the power grid, the economy and the electric energy quality.

Description

technical field [0001] The invention belongs to the field of electric power system dispatching automation, and relates to an automatic early warning, decision-making and control method for three-dimensional coordination of a power grid dispatching center. Background technique [0002] Energy Management System (EMS, Energy Management System) is a computer real-time monitoring and auxiliary decision-making system in the dispatching center of the modern power grid. The principle is to use the high-speed communication network to collect real-time operating data of the power grid, establish a mathematical model of the power grid, perform power generation control and power flow calculations, conduct power grid security analysis and control decision calculations, use the calculation results to assist dispatchers in decision-making, or directly implement closed-loop operations on the power grid control to achieve the purpose of safe and economical operation of the power grid. [00...

AI Technical Summary

Problems solved by technology

[0004] 1) Operation mode - the existing EMS is based on the research and analysis of the static power flow section, and the dispatcher needs manual request to perform the power flow and static safety analysis; although the automatic fault selection can be operated automatically, it only evaluates the static safety of the power grid, and cannot evaluate the dynamic state of the power grid Safety; although the alarm can be reported when an event occurs in the power grid, the early warning cannot be made after the real-time network analysis and calculation before the event occurs; the dispatcher can use EMS to analyze when the problem is found, and summarize experience after the accident, but cannot Carry out comprehensive analysis and judgment on the power grid situation before potential problems are exposed, and guide prevention and control

[0005] 2) Power grid modeling - the existing EMS independently establishes the grid model of its jurisdiction by the dispatching center, and cannot establish a global grid model online, lacking coordination between the vertical grid of the upper and lower grids and the horizontal grid of the horizontal grid at the height of the global grid ; The power grid outside the jurisdiction of the dispatch center adopts an offline equivalent model, and its external network equivalent model is fixed; there is no online exchange of grid model information between dispatch centers

[0006] 3) Analysis and decision-making - the real-time network analysis of the existing EMS only has the function of steady-state analysis, does not have the function of online dynamic analysis, nor does it have the function of voltage stability analysis, and does not consider the expansion of accidents caused by improper cooperation between relay protection and safety automatic devices Analysis

[0007] 4) Closed-loop control—Although the existing EMS has AGC automatic closed-loop control, AGC is based on measurement, not network analysis, and does not uniformly consider network security constraints in the real-time control model, and the control is based on sections. There is no coordination between different time scale controls; reactive power optimization software is only used for open-loop calculations, and system-level online reactive power and voltage closed-loop control graded according to control time is not realized

[0008] 5) Supporting platform——Although the traditional EMS is based on the distributed structure of the local area network, the core part is still based on the server-based master and backup machine operation mode, which cannot meet the requirements of solving a large number of differential-algebraic equations; although the software system has been transformed from a structure-oriented Software programming develops towards object-oriented programming, but it cannot meet the requirements of parallel computing that dynamically allocates multi-tasks on cluster computers

[0021] But so far, there is no comprehensive solution to the various deficiencies of the above-mentioned traditional energy management systems.

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