Emergency seamless switching system and method for full-water-cooling permanent magnet synchronous diesel generator set

Abstract

The invention discloses an emergency seamless switching system and method for a full-water-cooling permanent magnet synchronous diesel generating set. The system comprises a diesel generating set, anAC-DC bidirectional inverter main circuit, and a DC-DC bidirectional converter main circuit. The AC-DC bidirectional inverter main circuit is provided with three voltage lines L1, L2 and L3 for providing three-phase voltage for a load, and a zero line N, and the DC-DC bidirectional converter main circuit is connected with an energy storage battery pack. The permanent magnet synchronous generator respectively outputs direct current bus voltage UC and three-phase voltage through the AC-DC bidirectional inverter main circuit, and the direct current bus voltage UC charges the energy storage battery pack through the DC-DC bidirectional inverter main circuit; and when the load is suddenly increased to cause the drop of the DC bus voltage UC, the energy storage battery pack is boosted through theDC-DC bidirectional converter main circuit to enable the DC bus voltage UC to rise so as to maintain the stability of the DC bus voltage UC. According to the invention, the adaptive capacity of the diesel generating set under the condition of sudden loading, the emergency capacity under of the diesel generating set an abnormal condition and the stable power supply capacity of the diesel generating set at a starting stage are improved.

Description

technical field [0001] The invention relates to the technical field of diesel generator sets, in particular to an emergency seamless switching system and method for a fully water-cooled permanent magnet synchronous diesel generator set. Background technique [0002] The permanent magnet synchronous diesel generator set is a kind of power generation equipment with diesel as the main fuel. It uses the diesel engine as the driving force to drive the generator to generate electricity, and converts kinetic energy into electrical energy and thermal energy. [0003] The existing permanent magnet synchronous diesel generator sets have the following problems in use: [0004] One is the poor adaptability to sudden loads in energy-saving mode. In the energy-saving mode, the control system of the diesel generator set can adjust the engine speed in real time according to the output power of the generator, so as to achieve the purpose of energy saving and emission reduction. The power o...

AI Technical Summary

Problems solved by technology

[0004] One is poor adaptability to sudden loads in energy-saving mode

In the energy-saving mode, the control system of the diesel generator set can adjust the engine speed in real time according to the output power of the generator, so as to achieve the purpose of energy saving and emission reduction. The power output is limited, and it takes 2-3 seconds for the engine to speed up, so it cannot provide the required power in an instant, which will cause the engine to stop due to a large load

[0005] Second, poor emergency response capabilities in case of abnormal situations

Under abnormal circumstances, the diesel generator set cannot supply power to the equipment through seamless switching, and it will also cause damage and irreparable losses to the electrical equipment

[0006] The third is that the power supply cannot be realized during the start-up stage of the unit

Since it takes a certain amount of time to start and run the diesel generator set, it is impossible to provide stable power supply to the equipment during the start-up operation stage of the diesel generator set

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