Diesel generating set direct current capacitance calculation method under pulse load and diesel generating set system

By employing a dual-closed-loop vector control and low-pass filter AC-DC converter in the diesel generator set, combined with the energy storage capacitor calculation method, the problems of generator set speed fluctuation and mechanical stress under pulse load were solved, thereby improving the stability and reliability of the system.

CN122068786APending Publication Date: 2026-05-19ANHUI POLYTECHNIC UNIV +1
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Patent Information

Application Number
CN202610192500.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-10
Publication Date
2026-05-19

AI Technical Summary

Technical Problem

Existing technologies for addressing the adverse effects of pulse loads on diesel generator sets suffer from high costs, low efficiency, or large system size and high prices. In particular, when the energy storage capacitor value is not calculated properly, it can lead to fluctuations in engine speed and increased mechanical stress.

Method used

An AC/DC converter with dual closed-loop vector control, combined with a low-pass filter and energy storage capacitor, is used to isolate fast-pulse loads from slow-response diesel engines by calculating the capacitance value of the energy storage capacitor and designing the AC/DC converter control strategy. This reduces DC bus voltage fluctuations and minimizes engine speed shocks and mechanical stress.

Benefits of technology

It effectively suppresses DC bus voltage fluctuations, improves the stability and reliability of generator sets under high peak pulse loads, extends equipment life, reduces mechanical stress, and enhances the system's anti-interference capability and overall reliability.

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Abstract

The invention relates to the technical field of direct-current power supply control, in particular to a direct-current capacitance calculation method of a diesel generating set under a pulse load and a diesel generating set system. Comprise pulse peak power, pulse period, pulse on / off time, system no-load direct current voltage, allowable minimum direct current voltage and response time of a diesel engine control unit ECU; according to the obtained parameters, equivalent discharge time needing to be provided by the energy storage capacitor is determined; and calculating the capacitance value of the energy storage capacitor according to an energy conservation relation, and connecting the calculated energy storage capacitor in parallel to a direct current bus of the generator set. In the invention, by establishing a quantitative calculation method of the direct current energy storage capacitor under the pulse load and combining a slow response control strategy of low-pass filtering of a voltage loop of the alternating current-direct current converter, the pulse transient power is borne by the capacitor, and the diesel engine stably intervenes according to self response characteristics, so that the voltage fluctuation of a direct current bus is effectively inhibited; and engine rotating speed impact and mechanical stress are reduced.
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