Electric system wide area dynamical control method and system for compensating distributive communication time delay

Abstract

The invention relates to an electric system wide area dynamical control method and system for compensating distributive communication time delay, and belongs to the field of electric system wide area dynamical control. The electric system wide area dynamical control method provided by the invention comprises the following steps of: after a wide area dynamic controller obtains measurement data, respectively predicting and extrapolating the measurement data according to a pre-set prediction method and maximum communication delay, so as to obtain controller input data which are sufficient to compensate distribution characteristics of the communication time delay; respectively calculating according to the controller input data to obtain a series of control data; uniformly sending the control data to a network control unit; and selecting the corresponding control data as output according to current time by the network control unit for electric system wide area dynamical control. With the adoption of the technical scheme provided by the invention, different prediction algorithms can be selected aiming at different measurements, so that the prediction precision and the instantaneity can be improved; the prediction method is used for covering most part of the communication time delay, so that the distribution characteristics of the communication time delay can be effectively compensated; and a used wide area dynamical controller is mounted in a dispatching center, so that the coordination control of the plurality of wide area dynamical controllers can be conveniently carried out.

Description

technical field [0001] The invention relates to a power system wide-area dynamic control method and system capable of compensating distributed communication time delay, belonging to the field of power system wide-area dynamic control. Background technique [0002] The rapid development of modern society has higher and higher requirements for the reliability, safety and economy of modern power systems. The major regional power grids are gradually interconnected, forming a wide-area power system with a span of several thousand kilometers. The wide-area power system has significantly improved the system reliability, safety and economy, but the dynamic control problem of the system has also become more severe. The weaknesses of the traditional energy management system (EMS) and monitoring control and data acquisition system (SCADA) in the power system, which are not convenient for dynamic control of the wide-area power system, are gradually exposed. In order to solve the monit...

AI Technical Summary

Problems solved by technology

Typical data is that the average delay is about 10ms, but there will still be a delay of 80ms

In the wide-area dynamic control of the power system, the control data delivery interval is usually required to be 40ms to 50ms. It can be seen that it has extremely high requirements on the communication delay of the upstream channel and the downstream channel of the data stream, and the communication delay must be processed to achieve stability. control effect, otherwise the distribution characteristics of the communication delay is likely to lead to control failure, or even counterproductive

[0005] In the existing wide-area dynamic control methods of power systems, there are usually two methods for dealing with communication delays: one is to treat communication delays as fixed delays, although this method can reduce communication delays to a certain extent. However, due to ignoring the distribution characteristics of the communication delay, the control performance of the controller is unstable, and there is still a risk of control failure

The other is the wide-area dynamic control method, which divides the communication delay into multiple intervals, formulates control strategies for each delay interval, and finally selects the corresponding control strategy according to the actual communication delay. Compensation for the total time delay of the channel. This kind of wide-area dynamic controller is usually installed at the control location, which makes it difficult to realize the coordinated control of multiple controllers in this method. At the same time, the processing process of the time delay is complicated and requires complicated calculations. The implementation of multiple sets of control strategies in the controller is also very complicated

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