To reduce the inverter with output current of the harmonic, using the space vector pulse width modulation. According inverter with synchronous rotating coordinate system in the mathematical model, the grid voltage vector oriented vector control and d, q axis current loop control to achieve the d, q axis current decoupling control: d-axis current control active power, q-axis current control reactive power. Simulation and experimental results verify the feasibility and correctness.
Keywords: space vector pulse width modulation [5] grid voltage vector orientation [2] the current loop [2] decoupling control [3]
With the deterioration of the natural environment and the increasing depletion of the daily energy, wind power energy structure in the future occupy an increasingly important position, wind power technology to become the research hotspot countries [1-5]. Between the wind turbine and generator speed matching is a key issue, low-speed operation of wind turbine and the wind generators is accelerated through a common gear box connection. Expensive high capacity gearbox, high failure rate, maintenance difficulties, so wind power gear box has become the bottleneck of the further development of the system [6-8]. Development of direct drive wind power system to improve system efficiency and reliability of an effective way.
In VSCF wind power system, grid electrical grid-connected inverter is the heart. Inverter with pulse-width modulation (pulse width modualtin, PWM) control technology, with output current is sinusoidal and low harmonic content, power factor adjustable and fixed output voltage power grid under the DC bus voltage regulation, etc [9 -10], in the new energy and power generation plays an important role in the control strategy has been studied. [11] detailed analysis of the steady-state DC inverter model, low frequency small signal model and high-frequency small-signal model, these models because of their complex and difficult to apply control. [12] The instantaneous active and reactive closed-loop control, but there is no current loop and PWM modulation module, but by active and reactive power for a given error and feedback selector switch table, the method uncertainty kept switching frequency , so its hard to filter circuit is difficult to design and the need for high-speed A / D converter. Literature [13-15] The amplitude and phase control, but more complex control algorithm.
This article is derived in detail and wind power system network model inverter with space vector pulse width modulation (space vector pulse width modulation, SVPWM) method and the grid voltage vector oriented control strategy, using d, q axis current loop, to achieve active and reactive power decoupling control.

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