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In order to solve the voltage over-limit problem of distributed photovoltaic(PV) connected to string lines, it is feasible to fully utilize the reactive power regulation ability of PV systems to adjust the line's voltage. In this paper, based on analyzing the mechanism of the point of interconnection(POI) of PV systems voltage over-limit and the voltage sensitivity of low-voltage string lines, a reactive...
The recent development of dispersed generation leads to fact that distribution grids have to deal with the bidirectional power flow which may cause voltage rise above permissible level. Currently used voltage regulation scheme cannot completely and successfully cope with this problem. As a result of the further increasing penetration of distributed generation, the new voltage regulation system will...
Distributed Flexible AC Transmission System (D-FACTS) devices offer many potential benefits to power system operations. This paper presents a novel strategy for the application of D-FACTS devices in controlling system voltage. The impact of installing D-FACTS devices is examined by studying the sensitivities of voltage magnitude with respect to line impedance. Sensitivities enable us to determine...
The induction generators are basic to wind energy conversion. They produce the active power and consume reactive power, with the voltage characteristics fragile compared with that of the synchronous generators. In stressed system conditions, they may intensify var imbalance, causing undesirable operation of the zone 3 impedance relays (mho relays). In this paper, the static voltage characteristics...
Admissible range of grid voltage is one of the strictest constraints for the penetration of distributed photovoltaic (PV) generators especially connection to low voltage (LV) public networks. Voltage limits are usually fulfilled either by network reinforcements or limiting of power injections from PVs. In order to increase PV penetration level further, new voltage support control functions for individual...
This paper aims to develop a sequential three-phase power flow program with three-phase ZBus distribution factor(TZBD) for power flow calculation. First, using monthly energy consumption of customers in a customer information system (CIS) and typical daily load pattern of customer classes, the quarter hourly loading profiles of distribution transformers were derived. The derived daily load curves...
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