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Optimal Power Flow with local droop control of generators connected to distribution networks

pubblicazioni - Presentazione

Optimal Power Flow with local droop control of generators connected to distribution networks

Nel documento la rete di distribuzione è rappresentata da un modello matematico non lineare attraverso il quale vengono simulati e confrontati con una rete di test realistica.

In order to foster the installation of increasing shares of renewable generation at the distribution level it is necessary to introduce control strategies to avoid voltage and current congestions. Control strategies are also needed in the provision of ancillary services to the transmission grid by distributed resources. In the paper the distribution network is represented by a nonlinear mathematical model by which centralized, local droop and hybrid controls are simulated and compared with a realistic test network.

The simulations show that the local control may determine high losses and high absorption of reactive power in the primary substation, requiring the installation of compensation devices (e.g. STATCOM) or a more complex design of the droop curves. The centralized control allows a better management of power flows and a higher performance in solving voltage and current congestions, but it requires a more complex architecture.

As an alternative solution a hybrid control, i.e. a combination of centralized and local control systems that provides the benefits of the two control architectures, has been developed. It can be used both to operate the network in real time and in the operation planning phase.

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