Initialization method and system for electromagnetic transient simulation of permanent magnet direct driven wind-driven generator

Abstract

The invention discloses an initialization method and system for electromagnetic transient simulation of a permanent magnet direct driven wind-driven generator. The method comprises the steps of: obtaining the set active power, the set reactive power and the set terminal voltage of the permanent magnet direct driven wind-driven generator; calculating the theoretical parameter of the permanent magnet direct driven wind-driven generator; using the theoretical parameter as the input of the first stage of a signal selector to obtain the integral output of the double closed loop control of a grid-side converter and a generator-side converter to complete a first initialization phase; obtaining the control loop output parameter of the permanent magnet direct driven wind-driven generator, and calculating the dq-axis output voltages of the grid-side converter and the generator-side converter; using the control loop output parameter and the dq-axis output voltages of the grid-side converter and the generator-side converter as the input of the second stage of the signal selector to obtain the integral output of the double closed loop control of the grid-side converter and the generator-side converter to complete a second initialization phase. The method can make the permanent magnet direct driven wind-driven generator directly operate in a given stable state, and reduces the simulation time and the storage space consumed by the initialization process.

Description

technical field [0001] The invention relates to the field of electromagnetic transient simulation of permanent magnet direct drive fans, in particular to an initialization method and system for electromagnetic transient simulation of permanent magnet direct drive fans. 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 permanent magnet direct drive fans. 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 f...

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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 from the power flow calculation; 3) For complex simulation models containing multiple permanent magnet direct drive fans , multiple permanent magnet direct drive fans are initialized at the same time, there may be simulation divergence and runaway phenomena

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