Initialization method and system for electromagnetic transient simulation of doubly-fed fan

Abstract

The invention discloses an initialization method and system for electromagnetic transient simulation of a doubly-fed fan. The initialization method comprises the following steps: acquiring set activepower, reactive power and terminal voltage of the doubly-fed fan; calculating theoretical parameters of the double-fed fan; taking the obtained theoretical parameters as input of a first stage of a signal selector in a doubly-fed fan electromagnetic transient simulation model, obtaining integral output in GSC and RSC double closed-loop control, and finishing a first initialization stage; acquiringcontrol loop output parameters of the double-fed fan; calculating a dq-axis output voltage of the GSC and a dq-axis output voltage of the RSC; and taking the control loop output parameters, the dq-axis output voltage of the GSC and the dq-axis output voltage of the RSC as the input of a second stage of the signal selector to obtain the integral output in the GSC and RSC double closed-loop control, and finishing the second initialization stage. According to the initialization method, the double-fed fan can directly operate in a given stable state, and the simulation time and the storage spaceconsumed in the initialization process are reduced.

Description

Technical field [0001] The invention relates to the electromagnetic transient simulation field of a doubly-fed fan, in particular to an initialization method and system for the electromagnetic transient simulation of a doubly-fed fan. Background technique [0002] The advantage of electromagnetic transient simulation is that the simulation step is small (usually at the microsecond level), and the established model can be refined simulation, so it has been widely used in the related research of doubly-fed wind turbines. At the beginning of the electromagnetic transient simulation, the voltage, current, and power of each circuit element are all zero, and the links with the accumulation function in the control strategy (such as the integral link) are all zero. When the simulation is running stably, the voltage, current and power of each circuit element, and the integral link in the control strategy should reach a stable value. The process from the beginning of the simulation to rea...

AI Technical Summary

Problems solved by technology

This initialization method mainly has the following disadvantages: 1) The initialization of the model needs to consume a lot of simulation time and storage space; 2) The larger model may not run stably to the steady-state operating point given by the power flow calculation Make the active power, reactive power and machine terminal voltage output by the simulation model in steady state the same as the active power, reactive power and machine terminal voltage obtained by power flow calculation; 3) For complex simulation models containing multiple DFIGs, more Two double-fed fans are initialized at the same time, and simulation divergence and runaway may occur.

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