Optimal virtual inertia control method based on virtual synchronous generator

A technology of virtual synchronization and virtual inertia, applied in the direction of synchronous generator control, control generator, control system, etc., can solve the problem of sacrificing the stability of the inverter, good dynamic performance, and the key parameters of the virtual synchronous generator without comprehensive consideration of coordinated control , did not consider issues such as the power and capacity of the energy storage device

CN105006834AActive Publication Date: 2015-10-28HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-10-28

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Abstract

The invention discloses an optimal virtual inertia control method based on a virtual synchronous generator in the distributed power generation control field. According to the method, a control strategy of a virtual synchronous generator is employed for a micro-grid inverter to organically combine three control degrees of freedom including a droop coefficient m, a virtual inertia J and a virtual damping D, and thus optimization of key parameters of the virtual synchronous generator is achieved. Through adoption of the method, the inertia advantage of a conventional synchronous generator is fully exhibited, and the stability and the inherent dynamic performance of an inverter are also taken into consideration. Moreover, the output power and frequency oscillation problems brought by virtual inertia are solved while the power and the capacity configuration of an energy storage apparatus are considered.
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Description

technical field

[0001] The invention belongs to the field of distributed power generation control, and in particular relates to a micro-grid distributed power control method based on virtual synchronous generator technology. Background technique

[0002] In recent years, microgrids containing many distributed power sources are becoming a research hotspot at home and abroad. The distributed power sources in the micro-grid mainly include wind power, photovoltaics, micro gas turbines, diesel engines, etc. Most of the distributed power sources are connected to the micro-grid through inverters. core components. As a new microgrid inverter control scheme, the virtual synchronous generator control strategy has attracted more and more attention from scholars.

[0003] However, since the microgrid inverter based on the control strategy of the virtual synchronous generator simulates the primary frequency and voltage regulation of the power system and the rotor inertia and damping ch...

Examples

Embodiment Construction

[0061] The principle and specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0062] Such as figure 1 As shown, the rated capacity of the microgrid inverter is 100kW, and the DC bus voltage U dc is 600V, the effective value of the output AC line voltage is 380V / 50Hz, the filter inductance L is 0.24mH, the filter capacitor C is 90μF, T is 100kVA, 270 / 400V Dy11 isolation transformer, S T is a synchronous contactor.

[0063] Step 1, data acquisition and transformation.

[0064] Collect grid voltage e within one 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 output current i oa i ob i oc , the dq component u of the output capacitor voltage of the microgrid inverter is obtained through synchronous rotation coordinate transformation od , u oq , the dq component i of the inductor current on ...