A Case Study on High Power Compensator of the Power Grid Irregularities for Industrial Appliances

Abstract

The paper presents a case study on development of the high power compensator of the power grid irregularities. The compensator is dedicated for sensitive industrial installations protection against dips, sags and short duration interruptions in public power network. The energy for compensation will be stored in bank of high voltage stacked supercapacitors. The development of the new high power medium voltage compensator will be based on experience gained during the realisation in The Electrotechnical Institute Gdansk Branch a similar medium power low voltage device. The study includes: main power converter topology considerations with some preliminary simulation results including harmonic components discussion, the solution to the problem of fast identification of the grid voltage disturbances, the solution to the problem of compensator waveforms synchronization with the grid and the description of the main operational algorithm of the compensator.

Cascaded Multilevel Converter as a Voltage Compensator

“…This expression is derived directly from the principle of creating the stepped waveform in multilevel inverter with uniform gradation of the output voltage. This voltage balance for capacitors C1 and C2 is held in every working state by P2 converter (Fig.2) approximating an idea depicted in [4]. When converters P1 and P2 are disconnected the balance between the voltages U4 and U5 is determined by the ratio of time constants of intermediate circuits R1C1 and R2C2.…”

“…The compensator built of such inverters did not resolve satisfactory a problem of distorted waveforms in generated voltage. In [4] the authors presented some improvements in the synchronization mechanism which have been inserted in order to assure a proper sag detection. The paper summarizes theoretic and circuit consideration presented in [3,4] and supplements the subject in successive remarks and experimental results.…”

“…In [4] the authors presented some improvements in the synchronization mechanism which have been inserted in order to assure a proper sag detection. The paper summarizes theoretic and circuit consideration presented in [3,4] and supplements the subject in successive remarks and experimental results. The principle of the compensator performance allows to classify it as a special kind of active filtering devices or offline dynamic voltage restorers (DVR).…”

A 12-pulse rectifier using coupled reactors for supplying three-inverters

“…On the one hand, contemporary converters are designed using very fast switching semiconductor connectors, which reduces their electromagnetic compatibility. On the other hand, those systems are used in situations when large power is required at the reception side [1,2,3]. A multilevel voltage inverter requires a multipolar DC voltage supply in which the number of poles corresponds to the number of levels in the inverter.…”

18-pulse rectifier in arrangement with coupled three-phase reactor

“…The supply network is powerfully overloaded what provokes numerous compatibility problems. Contemporary converters are designed using very fast switching semiconductor connectors and are used in situations when large power as well as high power quality are required at the reception side [1,2,3,4]. A multilevel voltage inverter requires a multipolar DC voltage supply in which the number of poles corresponds to the number of levels in the inverter.…”