Large power grid overall situation on-line integrated quantitative evaluation method based on response

Abstract

The invention provides a large power grid overall situation on-line integrated quantitative evaluation method based on a response. The method comprises a first step of acquiring power grid topology structural information from an SCADA system and an EMS system and establishing a corresponding relation between the power grid topology structural information and a WAMS system power grid component, a second step of acquiring present power grid operation method trend data from the SCADA system or the EMS system or a WAMS system or acquiring various preconceived trends or transient state fault time domain data from a DSA system, and a third step of dividing responding data into two operation scenes including a steady state (or a quasi-stable state) and a transient state (or a dynamic state) in a macroscopic mode, wherein static state stabilization situation assessment is carried out on a power grid through an on-line node-facing method, and transient state stabilization situation assessment is carried out on the power grid through an on-line unit-facing method. Static state and transient state comprehensive assessment indicators are constructed based on component class thermostabilization, electric parameter acceptable range and system class stabilization, the comprehensiveness and reasonability of the overall situation assessment indicators are improved, and the efficiency of overall situation integrated assessment is improved through the method that tasks are carried out at the same time.

Description

technical field [0001] The invention relates to the field of online safety monitoring and early warning of large power grids, in particular to a response-based method for online integrated quantitative evaluation of the whole situation of large power grids. Background technique [0002] Ensuring the safe and economical operation of large power grids is the goal that power workers have been striving for for many years. With the continuous expansion of the scope of grid interconnection, the continuous deepening of the reform of the market-oriented system of the power industry, and the continuous access to UHV power transmission and renewable energy generation, the uncertainty of grid operation has increased, making the grid operating environment and dynamic behavior more complex. It is more difficult to analyze and control its stability. Once an accident occurs in the modern large power grid, if it is not dealt with in time, the consequences will be very serious. Since 2000 ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly four problems in the field of online security assessment and early warning of large power grids: ①Online security assessment of power grids mainly adopts traditional network modeling and simulation, although power grid security assessment mainly based on modeling and simulation It is an indispensable and important tool, but this method is restricted by factors such as the power grid model, parameters, and numerical calculations. It is difficult to adapt to the requirements of real-time monitoring of the power grid in terms of application scale, speed, and matching degree with real power grid conditions. New concepts and faster solutions; ②Large blackouts are often caused by unforeseen cascading failures or random disturbances. The existing "offline pre-decision and online matching" power grid security control mode based on expected accident sets cannot Matching the real working conditions of the power grid, and affected by the model and parameters, the obtained scheme is sometimes too conservative (or optimistic), especially the problem of combined explosion of fault sets severely limits the number of possible working conditions

However, in fact, grid stability is a unified nonlinear dynamic system stability problem. From the perspective of grid response, power angle and voltage are only an external form of expression, and there is a "dynamic The dialectical thought that there is stillness in the middle, and there is movement in the stillness"

Therefore, many existing evaluation methods and indicators have great overlap, and a more effective evaluation index system that can truly reflect the power grid operation situation is needed in a real-time operating environment; The online monitoring system did not provide intuitive and effective quantitative assessment and early warning information of the power grid operation situation during the slow deterioration of the power grid state, nor did it provide corresponding control measures based on the real working conditions of the power grid, which missed the best time to turn the tide

Images