Power sub-synchronous resonance inhibiting system based on NGH (Natural Gas Hydrate) method

Abstract

The invention discloses a power sub-synchronous resonance inhibiting system based on an NGH (Natural Gas Hydrate) method, belonging to the field of power system sub-synchronous resonance inhibition. The system comprises a generator, a transformer, an inductor, a resistor, a series compensation capacitor (C1) and a power grid equivalent capacitor (C2) which are connected into a power grid after being sequentially connected in series to form a power system; the system also comprises a sub-synchronous resonance inhibiting structure which is in bridge connection with two ends of the series compensation capacitor (C1) and comprises a series capacitor (CNGH-C), an inverter module and an inverter control unit, wherein the inverter module comprises two inverse parallel IGBT (Insulated Gate Bipolar Translator) inverters. The system provided by the invention has simple structure and safe and convenient control and can still play favorable inhibiting effect when the series compensation capacitance of the power system occupies smaller proportion in the total capacitance, thereby being more suitable for realizing engineering.

Description

technical field [0001] The invention relates to a power subsynchronous resonance suppression system based on an NGH method in electrical control engineering, and belongs to the technical field of power system subsynchronous resonance suppression. Background technique [0002] With the development of human society, more and more types of users have appeared in the power system. Due to the diversification of electrical equipment and the large increase in nonlinear loads, the probability of subsynchronous resonance in the power system has also increased greatly. Since many serious generator failures caused by subsynchronous resonance have occurred in the world, many scholars at home and abroad have studied the suppression of subsynchronous resonance from different angles. In recent years, some achievements have been made in subsynchronous resonance suppression, among which the NGH method has been verified by engineering practice in the United States. [0003] Compared with oth...

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Problems solved by technology

However, this method has relatively high requirements for the system structure of its application. The NGH structure must be connected across the two ends of the power system series compensation capacitor and the grid equivalent capacitor at the same time, but usually it can only be connected across the series compensation capacitor under actual conditions. both ends of

When the above requirements cannot be met, the NGH structure cannot achieve the expected inhibitory effect

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