Doubly-fed wind power generation system simulation experiment platform for control technology research

Abstract

A doubly-fed wind power generation system simulation experiment platform, mainly oriented to doubly-fed wind power generation system motor control layer control technology research simulation experiment device. The experimental platform includes: three-phase squirrel-cage asynchronous motor frequency conversion drive system simulated wind turbine, double-fed induction generator and rotor back-to-back converter, rotor side crowbar protection device, grid-connected bus power generation quality analysis device, DSP controller and upper machine simulation system, power grid anomaly simulation device, filter components and protection switches. The invention has an open controller, which facilitates the embedding of different control algorithms; it can simulate the abnormal state of the power grid, reflect the control effect of the control method when the power grid is disturbed and faulty, and ensure the safe and stable operation of the system platform through the crowbar protection device and the protection switch ; It also has the function of detection and analysis of power generation quality, and it is easy to realize the comprehensive evaluation of the application performance of control technology in double-fed wind power generation system.

Description

(1) Technical field [0001] The invention relates to a doubly-fed wind power generation system simulation experiment platform, in particular to a doubly-fed wind power generation system motor control layer control technology research simulation experiment device in the laboratory environment. (2) Background technology [0002] With the rapid development of the global wind power industry, doubly-fed wind turbines have become the mainstream model in the wind power system due to their advantages such as small excitation frequency converter capacity, large speed regulation range, and independent adjustment of active and reactive power. However, due to the increasing demand for wind power unit capacity and the increasing proportion of wind turbines in the grid, the unit control technology is immature, and the problem that research and development lag behind the current power system requirements has become increasingly obvious. Continuous research and improvement of control technol...

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Problems solved by technology

The wind power generation simulation experiment platform disclosed in the above-mentioned documents is a simulation under the condition that the grid voltage is ideal and no faults, and the simulation of grid-connected operation is not fully considered, resulting in a low ability of the actual system to resist grid faults

"Double-fed Wind Power Generator Fault Ride-Through Performance Simulation System" (Application No. 201010044820.2) discloses a double-fed wind power generator fault ride-through performance simulation system, where experiments on low voltage ride-through and weak grid support can be carried out on the experimental platform However, because the system control only uses indirect variable closed-loop feedback, and lacks the detection and analysis link for wind turbine power generation, it is difficult to compare control strategies and fault analysis of wind turbines

It can be seen that the existing doubly-fed wind power generation simulation experiment platform in China has the following shortcomings: ①The controller is not very scalable

The general functions of the platform are fixed, and the experimental methods are mostly repetition and imitation. The secondary development space for reprogramming and redesign of control technology is small, which is not conducive to the improvement of independent research and development capabilities.

② Insufficient consideration of the simulation of grid-connected operation

The stator end of the doubly-fed wind turbine is directly coupled to the grid, and its resistance to grid faults is low

If the platform does not take into account the random abnormality of the power grid, it cannot ensure the effectiveness and reliability of the unit control technology under real operating conditions

③Insufficient detection and analysis of power generation quality

Most of the existing platforms collect and process the data required by the control link, thus forming a closed-loop feedback, and lack the detection and analysis link for wind turbine power generation

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