Three-level NPC inverter based new DSTATCOM topologies and their performance evaluation for load compensation
اینورتر سه سطحی NPC بر اساس توپولوژی جدید DSTATCOM و ارزیابی عملکرد آن در جبران بار
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اینورتر سه سطحی NPC بر اساس توپولوژی جدید DSTATCOM و ارزیابی عملکرد آن در جبران بار
اینورتر سه سطحی NPC بر اساس توپولوژی جدید DSTATCOM و ارزیابی عملکرد آن در جبران بار
Abstract:
Now-a-days for effective load compensation, a conventional three-level neutral point clamped (CNPC) inverter topology is more preferably used. This compensator, however, faces the problems of additional clamping diodes, which reduces the redundant switching states and improves the problem of capacitor voltage imbalance; further increasing the inverter cost. In this paper, a detailed analysis of conventional NPC voltage source inverter (VSI) based Distribution Static Compensator (DSTATCOM) is given for shunt applications and to overcome its limitations, Conergy NPC and Active NPC VSI based new DSTATCOM topologies are proposed, exclusively for the load compensation. To demonstrate the effectiveness of the aforementioned topologies for shunt compensation, a three phase four wire system has been taken into consideration. Instantaneous symmetrical component theory (ISCT) is used for reference current generation, while, the hysteresis current control pulse width modulation (PWM) is used to generate the switching sequence for all the NPC configurations. A detailed simulation study has been carried out in MATLAB environment and the comparative evaluation of all the above DSTATCOM topologies is being provided.
Index Terms—DSTATCOM,Voltage source inverter, NPC, Hysteresis current control ,Distorted load ,Load compensation.
Introduction:
DSTATCOM is a VSI based shunt connected popular custom power device, used to achieve load compensation [1]. The various DSTATCOM configurations using conventional and multilevel inverters with its detailed control, working and analysis are discussed in literature [2–۵]. In VSI applications, two-level split capacitor configuration can compensate unbalance loads containing zero sequence components [6]; but imbalances the capacitor voltages. Further, this imbalance becomes more rapid if the load current contains dc component. Hence, chopper circuit needs to be used for capacitor voltage balancing. However, in the two level VSI, determination of chopper inductor rating becomes more complex. To alleviate such problem in shunt applications, it is suggested to use a three-level conventional NPC inverter [7], in which, there is no voltage drift during zero voltage state; thus, bypassing the capacitors. The investigations showed that NPC inverter is a promising alternative for high, medium and low voltage applications [8] with superior output voltage quality.
| نوع مقاله | ژورنال ELSEVIER |
| سال ارائه | ۲۰۱۴ |
| گزارش کار | دارد |
| شبیه سازی | در محیط MATLAB |
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