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Optimal Virtual Inertial Control Method Based on Virtual Synchronous Generator

A virtual inertia and virtual synchronization technology, applied in the direction of synchronous generator control, generator control, control system, etc., can solve the problem of sacrificing the stability and good dynamic performance of the inverter, without considering the power and capacity of the energy storage device, and virtual synchronous power generation. The key parameters of the machine do not comprehensively consider the coordinated control and other issues to achieve the effect of improving stability and economy.

Active Publication Date: 2017-09-19
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 1. Suppressing the inverter output power and frequency oscillation sacrifices the stability and inherent good dynamic performance of the inverter;
[0009] 2. Coordinated control is not considered comprehensively for the key parameters of the virtual synchronous generator;
[0010] 3. The power and capacity of the energy storage device are not considered, and there are certain limitations in practical applications

Method used

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  • Optimal Virtual Inertial Control Method Based on Virtual Synchronous Generator
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  • Optimal Virtual Inertial Control Method Based on Virtual Synchronous Generator

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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 ...

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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.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24H02P9/10H02P103/20
CPCY02P80/14
Inventor 张兴毛福斌刘芳徐海珍石荣亮胡超李文超
Owner HEFEI UNIV OF TECH
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