Frequency and voltage stabilization in local power suppy networks
The increased use of renewable energy has increasing effects on the stability of the mains supply. In large interconnected networks (electricity grids) this can still be compensated to a great extent by the large number of conventional energy suppliers. In smaller supply systems, whose supplies are predominantly provided by renewables or by small-scale power plants, stabilization measures are required in order to continuously ensure the desired voltage quality.
One type of system which is specifically designed to continuously provide high-quality voltage to loads is the uninterruptible power supply or so-called UPS system. Thanks to their integrated energy-storage devices, these systems are able, independently of the interconnected network, to form a high-quality local supply network and to supply the loads connected to them with uninterrupted power at constant voltage. UPS units are therefore also suitable for supplying and stabilizing power networks which are predominantly fed by other energy sources. The conditions which they must meet to achieve this and their incorporation into such a network are explained below.