Co-simulation system and method for doubly-fed wind turbine with multi-converters in parallel

Abstract

The invention provides a multi-converter parallel double-fed wind turbine generator system joint simulation method. The electric part model building steps are as follows: acquiring the electric part model of the multi-converter parallel double-fed wind turbine generator system built in the RTDS real-time digital simulator; The pneumatic part model building steps are as follows: acquiring the pneumatic part model of the doubly-fed wind turbine with multi-converters in parallel which is built in the GH Bladed wind turbine pneumatic simulation software; Information exchange step: information exchange is carried out between the electrical part model and the pneumatic part model. Correspondingly, the invention also provides a double-fed wind turbine unit joint simulation system for realizing the above method and a trigger pulse generation method in the system. The invention carries out real-time simulation of electric part in RTDS and simulation of fan pneumatic part in GH Bladed, realizesjoint simulation among multiple software, and fully exerts complementary advantages of simulation software.

Description

technical field [0001] The present invention relates to the technical field of wind turbines, in particular to a joint simulation system and method for double-fed wind turbines with multiple converters connected in parallel. Background technique [0002] In recent years, with the continuous development and maturity of wind power generation technology, the capacity of wind turbines is increasing, and the limited capacity of power semiconductor devices obviously restricts the increase of converter power. In order to solve this problem, currently large-capacity wind turbines generally adopt parallel connection of converters to increase the system capacity. Parallel technology greatly increases the power level of the system and improves the reliability of the system at the same time. Direction of development. [0003] At present, most of the simulation verifications of parallel connection of multiple converters are non-real-time off-line computer simulation software, which are ...

AI Technical Summary

Problems solved by technology

The biggest advantage of GH Bladed software is that it can carry out detailed modeling and analysis on the aerodynamic part, but it does not have the modeling and analysis capabilities of wind turbine converters, which greatly limits the scope of use of GH Bladed software

[0006] The patent document CN201410384985.2 provides a method for evaluating the subsynchronous oscillation of the wind turbine output system, and discloses the equivalent research model of the subsynchronous oscillation of the doubly-fed induction wind turbine under the single-machine infinite system. The model has undergone strict theoretical derivation and PSCAD simulation environment verification; but because the PSCAD software uses offline simulation, the actual simulation time is often dozens or even hundreds of times the time set by the simulation system, and the experiment efficiency is low

[0007] Patent document CN201310260171.3 provides a RTDS-based wind turbine digital simulation method. The aerodynamic part of the wind turbine is still built in the RTDS digital simulator, which is easy to operate. However, RTDS uses a simplified aerodynamic part model, which cannot quickly calculate the wind turbine Steady-state performance, including aerodynamic calculations, performance parameter calculations, power curve calculations, and steady-state operating load calculations; unable to fully simulate the entire dynamic process of the fan, including idling and shutdown of the fan; unable to analyze the data of the aerodynamic part of the fan, including spectrum analysis , annual power generation calculation, limit load, flicker intensity, etc.

Moreover, the control of the wind turbine in this technical solution still adopts the method of software control, and the hardware-in-the-loop of the controller is not realized. Therefore, the software-in-the-loop control cannot be applied to the actual industrial site, and the design problem of the controller in the actual industrial application cannot be simulated. Inability to prove the correctness and effectiveness of software control strategies in hardware controllers

[0008] In the patent document CN201510400570.4 "Performance test simulation platform for double-fed wind turbine frequency conversion controller" and patent document CN201510228282.5 "Large-scale wind turbine real-time operation control joint simulation platform and its construction method", the variable frequency controller of double-fed wind turbine The converter adopts a single converter method, which can cope with wind turbines with lower power levels. However, with the increase of the voltage level of wind turbines, the topology of single converter cannot be applied to high-power wind turbines.

In addition, the aerodynamic part of the former wind turbine is still modeled in RTDS, and detailed load calculation and data analysis cannot be performed

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