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

A subsynchronous resonance, power system technology, used in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problem that the NGH structure cannot achieve the suppression effect and can only be connected across the two ends of the series compensation capacitor. and other problems, to achieve the effect of easy maintenance, convenient equipment control, and good suppression effect.

Inactive Publication Date: 2010-10-27
HOHAI UNIV
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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

Method used

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

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Embodiment Construction

[0019] like figure 1 As shown, the overall system structure of the present invention includes a power system and a subsynchronous resonance suppression structure. Generator, transformer, inductor, resistor, series compensation capacitor C 1 , Grid equivalent capacitance C 2 After being connected in series, they are connected to the power grid to form a power system; the series capacitor C NGH-C , The inverter module and the inverter control unit form a subsynchronous resonance suppression structure, the inverter module is composed of two anti-parallel IGBT inverters, and an output terminal of the inverter module is connected in series with a series capacitor C NGH-C Connected to the series compensation capacitor C in the power system 1 The input end of the inverter module, the other output end of the inverter module is connected to the series compensation capacitor C in the power system 1 The output terminal of the subsynchronous resonance suppression structure is connecte...

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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...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 濮岚马宏忠张志新郭晓宁陈远俊张惠峰王刚
Owner HOHAI UNIV
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