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Renewable distributed generation systems are an alternative solution to provide energy locally near customers. However, the supplying of power without disturbance is the main challenge for utilities, especially for systems that integrate fluctuating renewable sources which can cause voltage sag and swell. In this paper, voltage sag and swell issues are investigated. The first studied scenario is related...
With the uptake of embedded renewable generation on distribution networks, it is becoming increasingly challenging to maintain the network within thermal and voltage limits. The application of Active Network Management (ANM) to provide additional thermal and voltage capacity headroom has been successfully applied to connecting wind farms in recent years. Analysis was undertaken in this study to explore...
The paper deals with control structures and functionalities contributing to the distribution grid smartness in the presence of distributed generators (DG). The Primary Cabin (PC) hosting DG is analyzed assuming a voltage control scheme that includes the Transformer (TR) with On-Load Tap Changer (OLTC), but also generators and FACTS allowing their reactive power remote control. Therefore more and contemporary...
The field trials in the two MV grids - ‘Großes Walsertal’ and ‘Lungau’ give new insights to the voltage control algorithms developed prior over the last couple of years. These experiences include: Advancement of the voltage control with the on load tap changer and the distributed generators’ reactive power - ‘range’ and ‘level’ controller respectively - towards better utilization of the voltage band...
The penetration level of renewable based distributed generation (DG) has increased rapidly in recent years. Grid standards demand small DG units to operate with constant power factor control mode and large DG units with voltage control mode. As a result, small DG units are exposed to the problem of slow voltage recovery due to contingencies like fault. This paper proposes a new sensitivity index based...
The growing sophistication and complexity of power system control apparatus and systems plus the addition of new topological features such as distributed generation at the distribution level requires new test environments which can evaluate and optimise these systems prior to deployment in the real system. One such environment is described in this paper along with examples of its use in evaluating...
Integration of small distributed generation (DG) units to weak distribution system is a major concern for power system engineers. Recent grid standards demand small DG operation with power factor control mode. Lack of sufficient reactive power support brings the problem of slow voltage recovery under post-fault condition. This paper presents a comprehensive VAR planning with a mixture of both static...
In weak distribution networks the amount of distributed generation (DG) is usually limited by the voltage rise effect. The voltage rise can be mitigated using passive methods such as increasing the conductor size which can, however, be quite expensive. Also active voltage control methods can be used to reduce the maximum voltage in the network. In many cases active voltage control can increase the...
Since Distributed Generation (DG) often involves renewable energy, it is important to facilitate integration of DG into existing networks. This is the aim of the EU FP6 demonstration project ADINE. It is based on the Active Network Management (ANM) concept, where automation, ICT and power electronics are used to integrate more DG by exploiting active resources instead of just reinforcing the network...
An important part of synchronous Distributed Resources (DR) is automatic load-frequency controller (ALFC). This paper introduces a new intelligent approach based on clustering of ALFC response with regard to input signal to governor. Self-organizing map (SOM) neural network is applied to identify and classify islanding and non-islanding phenomena. Output of SOM adds an extra binary control signal...
Existing approaches to the design, control and operation of 11 kV distribution networks often restrict optimal utilization. When confronting the increasing demand and growing amount of distributed generation being connected to the networks, it is essential for distribution system operators to employ new and more active network management practices. This paper presents and discusses a range of active...
Increasing penetration of Distributed Generation (DG) in distribution networks significantly changes both the real and reactive power flows in the network and can create serious voltage control problems. Furthermore, traditional Automatic Voltage Control (AVC) schemes that can normally deal with the reverse power flows, are unable to cope with the voltage problems associated with the presence of DG...
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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