一种新型基于电流控制的静止无功发生器

为了研究新型的静止无功发生器,用电路理论中的替代定理,提出了一种基于电流控制的静止无功发生器(ASVG)的原理。该ASVG由一个二次侧"多绕组"变压器和IGBT逆变器构成,把变压器一次侧并联接入电网中,二次侧的每个绕组与一个IGBT逆变器连接,通过控制变压器二次侧电流和一次侧电压的相位差,使整个变压器对于电网等效成纯电抗或纯电容负载。理论分析了这种原理,并与现有ASVG比较后给出了一种具体实现方法。样机试验验证了基于电流控制的新型静止无功发生器原理的正确性及相对与传统静止无功发生器控制简单,谐波小的优点。

Novel Advanced Static Var Generator with Current Control

A novel Advanced Static Var Generator(ASVG) based on current control is proposed in terms of the Substitution Theorem in circuit theory.Firstly,the principle of the novel Advanced Static Var Generator(ASVG) is analyzed.In the novel ASVG,a transformer with one primary winding and multiple secondary windings is chosen and its primary winding is shunted with load while the multiple secondary windings are connected with multiple IGBT inventers.When the phase error between the current of secondary windings and voltage of primary winding satisfies a certain relation,the transformer exhibits an equivalent inductive or capacitive component for power system,so that the conclusion could be drawn,which instruct the Research on a Novel Advanced Static Var Generator(ASVG) Based on Current Control.Secondly,during the realization novel Advanced Static Var Generator(ASVG),several key technical problems are analyzed.As to the current detection,the existing methods are illustrated.Considering all the methods mentioned,the method based on the instantaneous reactive power is adopted.As to the problem of adaptability for the high voltage and large capacity,several popular approaches are addressed.Among them,the multiple windings topology is applied.As to the control algorithms and tactics,the Triangle Wave Comparison PWM(Pulse Width Modulation) current control method is adopted,it is all digital control system.Finally,the validity of the novel ASVG is verified by the experimental results,as well as the advantages compared to the more conventional,such as simple control tactics and low harmonic component.