An initialization method and system for electromagnetic transient simulation of double-fed fan

Abstract

The invention discloses an initialization method and system for electromagnetic transient simulation of a double-fed fan. The method includes: obtaining the set active power, reactive power and machine terminal voltage of the double-fed fan; calculating the theoretical parameters of the double-fed fan; using the obtained theoretical parameters as the first signal selector in the electromagnetic transient simulation model of the double-fed fan stage input, get the integral output in the double closed-loop control of GSC and RSC, and complete the first initialization stage; obtain the control loop output parameters of the doubly-fed fan; calculate the dq axis output voltage of GSC and the dq axis output voltage of RSC; convert the control loop The output parameters, the dq-axis output voltage of GSC and the dq-axis output voltage of RSC are used as the input of the second stage of the signal selector, and the integral output in the double closed-loop control of GSC and RSC is obtained, and the second initialization stage is completed. The invention can make the doubly-fed fan directly run in a given stable state, reducing the simulation time and storage space consumed in the initialization process.

Description

technical field [0001] The invention relates to the field of electromagnetic transient simulation of double-fed fan, in particular to an initialization method and system for electromagnetic transient simulation of double-fed fan. Background technique [0002] The advantage of electromagnetic transient simulation is that the simulation step size is small (usually at the microsecond level), and the established model can be finely simulated, so it has been widely used in the related research of double-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 accumulative functions (such as the integral link) in the control strategy are all zero. When the simulation runs 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 start of simulation to reaching a stable v...

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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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