Power flow control in a substation of a wind- and solar farm: Design of an Optimisation Unit Considering a System's Physical Boundaries and Technical Constraints

The goal of this graduation project was to design a state-of-the-art central farm controller. The designed central farm controller distinguishes itself from prevailing controllers by including a subsystem (the optimisation unit) that contributes to an improvement in power transmission effciency, decrease in maintenance costs and an increase in...

Real-time Active- and Reactive Power Control in a Combined Wind- Solar PPM

Increase in wind- and solar parks complicate grid stability due to their deterministic behaviour. ENTSO-E established requirements for generators for grid connection in Europe. A requirement is to have active- and reactive power control that implements a power setpoint given by the transmission system operator. This thesis describes the design...

Power flow modeling in a substation of a wind-and solar farm

Identifying options for the multi-terminal expansion of the COBRAcable

A meshed North Sea offshore electricity grid with high renewable energy penetration, as envisioned by the European Commission, is still at its infancy. Currently, point-to-point high-voltage DC interconnections across borders are already being implemented successfully, but the next steps of expanding these interconnectors with additional...

Parameter Identififcation of Dynamic Equivalents Using Heuristic Optimization Techniques

This thesis introduces an approach for determining the parameters of aggregated dynamic equivalents for active distribution system from a reference set of signals associated with various disturbances using mean-variance mapping optimization (MVMO) algorithm. As the penetration of renewable energy sources in the LV and MV network increases, it...

Secondary voltage control in the Netherlands: A feasibility study

Increasing integration of renewable energy sources, distributed generation, smart grid technologies and other power electronic devices into the grid has given rise to numerous challenges in the electricity transmission and distribution system operations domain. Due to the increasing complexity in electricity market processes, control of active...

A Scenario-Based Static Voltage Stability Analysis for External Constraints in Flow-Based Capacity Calculation

Static voltage stability study for the Dutch grid and investigation of feasibility of scenario-based external constraints for the flow-based capacity calculation process. This process is used to determine the cross-border transport capacity available to the power markets in flow-based market coupling.

PMU Based Line Impedance Estimation

This thesis is focused on the the line impedance calculation and the most important part is to find a suitable error compensation to increase the accuracy of calculation results. First of all, adequate PMU based calculation methods are necessary. Among methods found in the literature, the best ones are tested in laboratory and field conditions,...

Preferred offshore power grids for wind energy

Offshore wind energy has become a very hot topic in northwest Europe, both from an industrial as from an academic point of view. Research on transmission grids for offshore wind energy focuses predominately on radial grids and HVDC. This study broadens this general scope by taken mesh grids and HVAC as the starting point. With the use of load...

Reliability modelling in transmission networks: An exploratory study for further EHV underground cabling in the Netherlands

The worldwide demand for electricity, which is steadily increasing, leads to a continuous need for developing and extending the transmission networks. However, the installation of new overhead lines faces many challenges due to social, environmental and technical reasons. One solution that gains widespread public support is the installation of...

Distributed-Dynamic State Estimation with SCADA and PMU

The purpose of this research is mainly to develop a distributed dynamic state estimation with PMU and SCADA as a response of the challenges in state estimation problems (accuracy, computational time, the use of new technology along with the ability to keep the existing traditional measurement). With the implementation of statistical signal...

Low Short Circuit Ratio Connection of Wind Power Plants

Primary factor for the site selection during the planning process of the large modern wind farms is the wind climate, which is usually favorable at remote and offshore locations where the public grid is not particularly strong. Among the consequences of this solution is the necessity to connect wind farms to weak points of the grid and the...

The role of EV adaptive charging in facing higher integration levels of wind energy in Denmark

Denmark aims for a 50% wind integration in 2020. In the current scenario, where wind represents around 34% of domestic consumption, mothballing of conventional power plants and heavy dependency in interconnection lines is already the trend. One of the strategies from the Transmission System Operator is to integrate a big volume of flexible loads...

Impact of Large Amounts of Photovoltaic Installations in Low-Voltage Networks on Power System Stability During Transmission System Faults: A German Case Study

It is expected that the share of renewable energy sources will increase to meet rising demand. One of the challenges integrating this distributed generation (DG) into the power system is the behaviour of low voltage connected DG in case of a transmission system fault. This research aims to give recommendations for low voltage (LV) grid codes to...