Self-adaptive control method for inertia and damping of grid-connected inverter
An adaptive control and inverter technology, applied in the direction of AC network circuit, parallel feeding arrangement of single network, flicker reduction of AC network, etc. Influence, inability to take into account the dynamic adjustment performance of power and frequency, etc., to achieve the effect of taking into account rapidity and stability, improving active power characteristic curve and frequency characteristic curve, and enhancing robustness
Pending Publication Date: 2021-07-09
GUIZHOU POWER GRID CO LTD
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Problems solved by technology
[0003] At present, although the research on VSG technology has made great progress, there are still many problems that need to be further solved in its application in practical engineering.
The traditional VSG control technology adopts constant inertia and damping control, which cannot take into account the dynamic adjustment performance of power and frequency; a large number of improved VSG control technologies only consider the effect of inertia on the frequency response characteristics of the system, but ignore the effect of damping on frequency stability , and the selection principles of inertia and damping are not given
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[0064] The present invention will be further described below in conjunction with accompanying drawings and examples.
[0065] figure 1 It is a topological block diagram of the basic principle of the grid-connected inverter inertia and damping adaptive control method adopted in the present invention, and the simulation model of the present invention is built according to the block diagram. In the figure, DG and energy storage device constitute a DC source to simulate the prime mover of a conventional power generation system, R s and L s Simulate the stator armature resistance and synchronous inductance of the synchronous generator respectively; e abc =[e a ,e b ,e c ] T , u abc =[u a ,u b ,u c ] T i abc =[i a ,i b ,i c ] T Respectively VSG induced electromotive force, three-phase output terminal voltage and grid-connected current; P e and Q are the active power and reactive power output by VSG respectively; P ref , Q ref , U ref , ω ref are the input refere...
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The invention discloses a self-adaptive control method for inertia and damping of a grid-connected inverter. The method dynamically adjusts the rotating inertia and damping coefficient of the grid-connected inverter according to the change rate and offset of a frequency, reduces the fluctuation of power and the frequency, and realizes the stable operation of a grid-connected control system. According to the method, the dynamic characteristics of the energy storage device are considered, coordinated operation of all parts of the system is promoted, the active power characteristic curve and the frequency characteristic curve of the system are further improved, meanwhile, the robustness of the system is enhanced, and the rapidity and the stability of the system are also considered.
Description
technical field [0001] The invention belongs to the technical field of micro-grid control, and in particular relates to a grid-connected inverter inertia and damping self-adaptive control method. Background technique [0002] With the rapid development of social modernization, traditional fossil energy can no longer meet the requirements of sustainable development of human beings, and the construction of a stable, reliable, safe and environment-friendly new generation power network has become an inevitable trend of the development of the times. Therefore, renewable energy has attracted more and more attention because of its advantages such as economical and environmental protection. However, distributed generation (Distributed Generation, DG) needs to be connected to the grid through a grid-connected inverter. Although the grid-connected inverter has the advantages of flexible control and short transient time, it lacks inertia and damping, and its ability to suppress interfe...
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IPC IPC(8): H02J3/00H02J3/38H02J3/24
CPCH02J3/002H02J3/381H02J3/241H02J2203/20
Inventor 班国邦吴舟袁旭峰张露松邹雕杨文勇李义杨旗曾华荣欧阳泽宇闫桂航李欣徐舒蓉毛先胤牛唯刘丽马晓红
Owner GUIZHOU POWER GRID CO LTD