Analysis of Emergency Operation Modes of Micro Power Systems with Small Hydroelectric Power Plants

摘要

This article discusses emergency modes of operation of synchronous generators operating in parallel with the electric power system and, in particular, in the autonomous mode. For a qualitative assessment and analysis of the properties of micro-power systems with mini-hydroelectric power plants in emergency modes, a calculation scheme was modeled in the PSCAD/EMTDS software package. Variant calculations have been carried out, when in the first case, an unstable short circuit occurs behind the transformer and self-destructs, and in the second case, a stable short circuit turns off the high-voltage circuit breakers. The parameters of the electrical equipment installed in the Gorno-Badakhshan power system "Pamir-Energy" of the Republic of Tajikistan were used as the initial data. An assessment of the impact of emergency modes on the parallel operation of a synchronous generator was obtained. It is shown that in the event of an unstable short circuit, which self-destructs, it can switch to the initial mode. In the case of a stable short circuit of 0.5 seconds duration, the stability of the generator, as well as the equivalent power system, is disturbed. It is recommended to develop additional emergency-free automatics to prevent switching to the asynchronous mode of the synchronous generator.