Method for harmonic simulation in power distribution network and centralised active filtering analysis

Research and development about harmonic filtering in power systems have been directed toward active filtering approaches. Suggested solutions are no longer limited to simulation but also begin to be used in real industrial networks. However, those active methods are still limited to local compensation: active filters only use measurements corresponding to their coupling point. At the same time, centralised (or global) passive filtering methods are considered to simultaneously reduce harmonic pollution in every points of the network. Getting active filtering advantages in a global compensation approach requires definition of new active filtering algorithms based on relevant measurements taken from different network points. To achieve such a task, one needs to simulate the complex behaviour of a complete nonlinear electrical network, together with its associated active filters and their control. Such a simulation tool must be able to compute transients states due to the closed loop between adaptive filters and a variable electrical network. The SIMULINK simulator is a possible simulator for this purpose as it offers numerous toolboxes with a user-friendly graphical interface. The problem with choosing such a nondedicated software is that it requires development of a specialised toolbox of elementary electrical network components. This toolbox is described and the way the electrical components models are connected to each other to form a complete electrical network is defined. Also described is the possible association of electrical networks with supervision devices.