Virtual synchronous generator-based rotational inertia optimization control method

A technology of virtual synchronization and moment of inertia, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as inverter output power and frequency oscillation, transient anti-interference ability and overload ability, shutdown, etc., to achieve Solve the shock and take into account the effect of running stability

Inactive Publication Date: 2018-09-04
HARBIN UNIV OF SCI & TECH
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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.
However, 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 due to protection, and even endanger the safety of the power device and the stability of the microgrid operation. sex

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  • Virtual synchronous generator-based rotational inertia optimization control method
  • Virtual synchronous generator-based rotational inertia optimization control method
  • Virtual synchronous generator-based rotational inertia optimization control method

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Embodiment Construction

[0043] The principle and specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0044] figure 1 It is the main circuit topology and control structure diagram of the micro-grid inverter of the present invention. By optimizing the 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 protection system can be maximized.

[0045] The steps of the present invention are:

[0046] Step 1, collect the grid voltage e within a switching cycle a 、e b 、e c , the output capacitor voltage u of 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 output current i od i oq ;

[0047] Step ...

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Abstract

The invention discloses a virtual synchronous generator-based rotational inertia optimization control method, and belongs to the control field of distributed power generation. When frequency offset exceeds an allowable range, the rotational inertia is adjusted to slow down frequency change; and when the frequency change rate is in a zero passage reversion state, the rotational inertia is adjustedto realize frequency recovery. By virtue of the method, a microgrid inverter adopts a control strategy of the virtual synchronous generator, so that an optimization algorithm of the rotational inertiaof the virtual synchronous generator is realized; meanwhile, by improvement of a speed adjustment link, a voltage current phase angle is obtained by adopting a control mode to calculate the phase angle; and by adoption of the method, the inertia advantage of the conventional synchronous generator can be embodied completely, the inherit dynamic performance and stability of the inverter can be taken into consideration, and the economical efficiency of the power grid operation 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 inertia and damping characteristics, and can participate in the regulation of grid voltage and frequency, which has the advantage of being naturally friendly to the grid. Therefore, referring to the operation experience of the power system and the characteristics of the synchronous generator, the friendly connection of the inverter to the grid can be realized, and many problems and challenges faced by distributed power generation in grid connection can be solved to a large extent. Based on this idea, virtual synchronous generator technology came into being. The virtual synchronous generator technology makes the inverter comparable to the traditional synchronous g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/381
Inventor 颜景斌李国策常龙龙
Owner HARBIN UNIV OF SCI & TECH
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