Adaptive control method for moment of inertia of virtual synchronous generator
A technology of adaptive control and virtual synchronization, applied in the direction of circuit devices, AC network circuits, reducing/preventing power oscillation, etc., can solve the problem of shutdown, anti-interference ability and overload ability not as good as synchronous generators, endangering the stability of power device microgrid operation Sex and other issues, to solve the oscillation problem of output power and frequency, easy to achieve the effect
Inactive Publication Date: 2018-11-02
HARBIN UNIV OF SCI & TECH
View PDF2 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] However, since the microgrid inverter using the virtual synchronous generator control strategy simulates the primary frequency regulation and voltage regulation of the power system and when the DC distributed power output is disturbed, the output power and frequency of the inverter will inevitably oscillate; but For the inverter, its transient anti-interference ability and overload ability are far inferior to those of the synchronous generator. The surge current caused by the shock may cause the inverter to stop for protection, and even endanger the safety of the power device and the stability of the microgrid operation. ; Therefore, it is imperative to optimize the control method for the moment of inertia
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0019] The principle and specific implementation of the present invention will be described below in conjunction with the accompanying drawings.
[0020] figure 1 It is the main circuit topology and control structure diagram of the microgrid inverter. Through the optimal control of the moment of inertia, the oscillation of the output power and frequency of the inverter can be avoided, and the stable operation of the system can be protected to the greatest extent.
[0021] Concrete implementation steps of the present invention are as follows:
[0022] Step 1, collect the grid voltage e within a switching cycle a 、e b 、e c , the capacitor voltage u output by the microgrid inverter oa , u ob , u oc , bridge arm side inductor current i La i Lb i Lc and the output side current i oa i ob i oc , the capacitance voltage u in the synchronous rotating coordinate system is obtained by coordinate change od , u oq , the inductor current i Ld i Lq and the output side current...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides an adaptive control method for the moment of inertia of a virtual synchronous generator in order to overcome the defect that in a virtual synchronous generator control strategy,the moment of inertial cannot weakening the impact on the system frequency while considering the system response rapidity when the frequency changes. When the frequency offset is out of an allowed range, the moment of inertia is adjusted to slow down the change of the frequency; and when the frequency is recovered, the moment of inertia is adjusted to achieve rapid recovery of the frequency. According to the method, not only can the inertia advantage on a traditional synchronous generator be fully embodied, but also the inherent dynamic performance and the stability of an inverter can be achieved simultaneously, and the operation economy of a power grid can be improved.
Description
technical field [0001] The invention specifically relates to a control method of a micro-grid distributed power supply based on virtual synchronous generator technology, and belongs to the field of control technology in new energy power generation. Background technique [0002] Synchronous generators have excellent inertial characteristics and can participate in the regulation of system frequency; therefore, combined with the operating experience of the power system and the characteristics of synchronous generators, friendly access to the inverter grid can be achieved; based on this idea, the virtual synchronous generator Technology emerges as the times require; the virtual synchronous generator technology simulates the characteristics of the synchronous generator body model, active power frequency regulation and reactive power voltage regulation, so that the inverter can be compared with the traditional synchronous generator in terms of operating mechanism and external chara...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24H02J3/38H02J2203/20
Inventor 颜景斌李国策常龙龙李明伟李冠达闫海
Owner HARBIN UNIV OF SCI & TECH