Probabilistic assessment of wind power production on voltage profile in distribution networks

Abstract

Distribution power networks are accommodating more and more generation and most of them are based on renewable sources, like wind power. Then, this new generation, generally known as distributed generation (DG), has a stochastic power production that affects technically the network in different ways. However, availability and power quality must be kept within standard limits. Deterministic approach can not cope with this issue and a probabilistic assessment is needed. Wind power has a high level of integration around the world. Then, its impact of voltage profile in a distribution network is analyzed.

Stochastic Evaluation of Voltages in Distribution Networks With Distributed Generation Using Detailed Distribution Operation Models

“…The stochastic loads and DG output power are considered in [6]- [9] to analyze the impact of DG connection on the network operations in different ways of probabilistic load flow computations. In addition to loads and DG power production variations, the uncertainty in the location and state of DG connection was handled in [10].…”

Distribution network planning with a large amount of small scale photovoltaic power

“…The European standard EN 50160 regulates the voltage characteristics in public distribution systems [16] . According to the standard EN 50160, the supply voltage should stay within the range of ± 10% of the nominal voltage during 95% of each period of one week, when measuring 10 minutes mean rms values [7], [16]. This restriction is presented in Table I: …”

“…However, deterministic planning methodologies are not able to handle uncertainties [7]. These methodologies can lead to uneconomical or unreliable solutions [3].…”

“…Traditionally, planning approaches have focused LF on extreme conditions, while the likelihood of these events is not considered [5]. Although probabilistic approaches have been used in power system analysis since the 70s [6], deterministic approaches have meanwhile still been employed by transmission system operators (TSOs) and DSOs due to their easy and fast results [7].…”

“…While a deterministic approach solves a specific state of the system, usually the worst case conditions; a probabilistic assessment describes the more likely states of the system [7]. A probabilistic load flow (PLF) allows evaluating the probabilistic variation of voltages at all nodes in a grid [5].…”