Abstract
As large-scale direct-drive wind turbine generator set is connected to the grid, the power system will face problems such as reduced inertia and insufficient frequency modulation capability. The control of wind turbine virtual inertia is an important way to solve this problem. Therefore, this paper takes the direct-drive wind power generation system as the research object, draws lessons from the multi-time scale modeling idea, and based on the electrical torque analysis, establishes the DC voltage time model with the wind turbine virtual inertia control. Based on this, inertia damping characteristics of direct-drive wind power grid-connected system are analyzed. The results show that the dynamic characteristic parameters of the system are affected by many factors, among which the equivalent inertia coefficient of the system is mainly affected by DC capacitance, DC bus voltage and wind turbine virtual inertia control parameters. Damping coefficient is mainly affected by steady-state operating point and DC voltage proportional control parameter K <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">pu</sub> . The synchronization coefficient is mainly affected by steady-state operating point and DC voltage integration control parameter K <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">iu</sub> . The correctness of mechanism analysis of inertia damping characteristics of the whole system is verified by simulation, which provides a certain theoretical reference for inertia damping research of electronic power system.
Highlights
Direct-driven Wind Turbine with Permanent-Magnet Synchronous Generator (D-PMSG) has been widely used in wind power grid connection due to its advantages of small size and low operating cost [1], [2]
Considering the power converter control based D-PMSG, the power control is decoupled from the grid frequency response [3], the wind turbine cannot participate in the grid frequency response under the control of Maximum Power Point Tracking (MPPT)
Based on the idea of multi-time scale analysis, the equivalent inertia damping characteristics of the system with wind turbine virtual inertia are studied by using electrical torque method under the control of DC voltage time scale, and the law that influences the equivalent parameters of the system is analyzed
Summary
Direct-driven Wind Turbine with Permanent-Magnet Synchronous Generator (D-PMSG) has been widely used in wind power grid connection due to its advantages of small size and low operating cost [1], [2]. In [10], a virtual inertia coordinated control strategy for weak-grid is proposed based on the dynamic characteristics of DC voltage. In [18], based on the idea of multiple time scale division, the influence of the reactive power control of grid connected inverter on the dynamic characteristics of the system is studied. The idea of multiple time scale analysis provides a new analytical thinking to study the dynamic stability of power electronic system. Based on the idea of multi-time scale analysis, the equivalent inertia damping characteristics of the system with wind turbine virtual inertia are studied by using electrical torque method under the control of DC voltage time scale, and the law that influences the equivalent parameters of the system is analyzed. PWTref is the rated power of the wind turbine output (including the maximum tracking power PMPPT and the virtual inertia power Pvic), ωr is the wind turbine frequency, rotation speed isabc is the stator current of the generator, udc is the DC bus voltage, Cdc is the DC bus capacitance, and L is the filter inductance
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