A Stability Judgment Method of Distributed Frequency Control Considering Communication Delay

Abstract

The invention discloses a distributed frequency control stability judgment method considering communication delay. The judging method includes: the control equation of the microgrid pinning consistency under the actual microgrid delay, and performing Laplace transform on the control equation to obtain the characteristic equation of the microgrid; judging according to the solution of the characteristic equation stability of the microgrid. The actual delay is introduced in the secondary control system based on the microgrid, which is in good agreement with the actual project. At the same time, the calculation is simple, and the stability of the microgrid can be determined by simple calculation of the known system parameters.

Description

technical field [0001] The invention relates to the field of power grid frequency control, in particular to a method for judging the stability of distributed frequency control considering communication delay. Background technique [0002] The control strategy based on the consensus algorithm is often used in the secondary control of the microgrid, and the cooperative operation between distributed power sources is realized through the sparse communication network. In the micro-grid distributed secondary control system, the delay in the system will have a significant impact on the operating performance of the micro-grid, and excessive delay will lead to poor stability of the micro-grid. Related studies in the prior art only pointed out the delay problem in microgrid control, or analyzed the performance changes of the control system of microgrid under delay based on strong idealized assumptions, but failed to understand the problem in the general mode Analyze the impact of tim...

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Problems solved by technology

In the micro-grid distributed secondary control system, the delay in the system will have a significant impact on the operating performance of the micro-grid, and excessive delay will lead to poor stability of the micro-grid

Related studies in the prior art only pointed out the delay problem in microgrid control, or analyzed the performance changes of the control system of microgrid under delay based on strong idealized assumptions, but failed to understand the problem in the general mode Analyzing the Effect of Latency in Microgrids

At present, the microgrid has the problem that the stability of the microgrid is difficult to calculate when there is a delay. When there is a communication delay, the consistency control system of the microgrid may be unstable, and the impact of the delay on the stability of the microgrid is complex. of

[0003] In the prior art, the assumption of symmetrical delay of the microgrid is proposed, which requires the local sampling delay of all distributed power sources in the microgrid and the transmission delay of each communication line to be the same delay, but This assumption deviates greatly from the actual engineering situation

On the one hand, the local sampling delay of the distributed power supply is determined by the sampling frequency of the controller, and the transmission delay of the communication line is determined by the structure and length of the line. On the other hand, the same transmission delay of all communication lines requires that each communication line All have the same structure and length, but it is difficult to guarantee in actual engineering, therefore, the symmetrical delay assumption adopted in the prior art deviates greatly from the actual engineering

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