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دانلود رایکان مقاله انگلیسی ISI با موضوع کنترل توان راکتیو

عنوان فارسی مقاله:

کنترل توان راکتیو برای بهبود ولتاژ: یک مقایسه بین دو روش غیرمتمرکز

عنوان انگلیسی مقاله:

Reactive power control for improving voltage profiles: A comparison between two decentralized approaches

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بخشی از مقاله انگلیسی :

2. Control methods of voltage profiles in distribution systems with DG

The existing MV distribution networks are designed and calibrated for a passive and radial use, involving unidirectional power flows from the higher voltage grid to the lower one. Consequently, voltage profiles fall along the lines with a slope depending on both the line characteristics and the power demanded. Thus, in the passive distribution networks, passive voltage control strategies were required. Simplifying, they were based on: (i) Automatic Voltage Controller (AVC) applied to On-Load Tap Changer (OLTC) installed on HV/MV transformer; (ii) off-line setting of MV/LV tap position; (iii) local regulation of capacitor banks, along the lines [13]. The connection of DG to distribution systems modifies voltage levels at customer’s end and introduces different degrees of complexity in the voltage control strategies. In fact, according to the criterion by which DG is connected, the voltage control strategy could change. If DG connection is planned considering the extreme conditions of minimum load (Pload = 0) and maximum generation, and assuming operation under unity power factor, the voltage at the connection bus depends mainly on both the real part of the network impedance and the active power injected (if the probability of this extreme situation occurring is low, it may be beneficial to accommodate a larger generation with the condition that DG is curtailed when the voltage at the connection bus rises to that of the statutory limits); if the planning of DG also depends on the reactive flows (assuming operation under power factor less than one), the value of the X/R ration of line influences greatly the voltage at the bus connection; if the OLTC regulates the voltage at the connection bus, the voltage control method must take into account the OLTC control strategy and the injected power from DG at the connection bus. Generally, these three situations of regulating voltage can occur in combination, thereby increasing the complexity of the control strategy to adopt [14,15].