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Various configurations can be considered for a dc Microgrid (MG) comprising distributed generation (DGs) units and loads. Renewable energy sources and energy storage systems of plug-and-play nature can change the configuration of the MG at any time. Each configuration has a distinct and unique mathematical representation that influences the operation of the MG. However, the voltage throughout the...
The paper presents issues of receiving node voltage stability. Voltage level is related to voltage stability. However, this value is not always a good indicator of distance to the stability limit. Discrepancies may occur especially when voltage regulation is performed. Such regulation causes changes of voltage level and voltage stability conditions. Thus, it seems reasonable to observe and predict...
Voltage regulation in distribution networks featuring high penetration of distributed photovoltaic (PV) generation is particularly challenging due to the stochastic nature of solar energy. To ensure that voltage levels remain within safety margins, this paper introduces a real and reactive power optimization model that penalizes the conditional value-at-risk of the voltage deviation from its nominal...
A Florida utility feeder with a high penetration level of solar photovoltaic (PV) generation was modeled in RTDS/RSCAD. The feeder model was validated by comparing the results in different simulation tools, and using field measurements and short circuit data provided by the utility. The feeder has 2.6 MW of PV which is approximately 30% penetration (comparing with peak load). The feeder has a step...
The voltage regulation for stand-alone three-phase single-stage boost inverter (SSBI) is presented in this paper. In three-phase SSBI, the voltage regulation is achieved by adjusting the boost ratio. The SSBI has been simulated for a wide range of input dc voltages and load levels. Moreover, the performance a 2kW 208/230V laboratory-scale three phase boost inverter is presented for both linear and...
This paper presents a novel controller design for controlling appliances based on local measurements of voltage. The controller finds the normalized voltage deviation accounting for the sensitivity of voltage measurements to appliance state. The controller produces a signal indicating desired power consumption which can be mapped to temperature setpoint offsets of thermostat controlled loads. In networks...
In Queensland, Australia, the statutory regulation for an electricity distribution network is to deliver a voltage within ± 6% to customers from the nominal value of 240 V. Typically, voltage control is determined using the system load as the main driver. This approach gives preference to customers that use more energy. This paper presents a customer-weighted method to control the voltage regulation...
Most of the dispersed generation systems (DGS) have smaller installation capacity and have to be connected to the distribution network to supply electric power into the utility as well as local loads. When the DG is interconnected in parallel with the utility distribution system, some operating conflicts might arise that affect the system power quality. This paper investigate the effect of DG on the...
As grid-integrated photovoltaic (PV) systems become more prevalent, utilities want to determine if, and at what point, PV systems might begin to negatively impact the voltage regulation of their distribution systems. This paper will briefly describe voltage regulation methods in a utility distribution system. It will also take a preliminary look at the distribution impacts of high penetrations of...
The increasing connection of distributed energy generation in a distribution network may lead to unacceptable voltage rise. An automatic voltage reference setting technique, acting on the tap change control of the transformer supplying the network, can be used to address this problem. By measuring essential voltage points along the distribution network, an automatic voltage reference setting technique...
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