Method and system for direct-current microgrid virtual inertia control considering parameter self-optimization

Abstract

The invention discloses a method and a system for direct-current microgrid virtual inertia control considering parameter self-optimization. The method comprises the steps that firstly, according to the response characteristics of a microgrid system in power fluctuation and the characteristic that the virtual inertia and the virtual damping coefficient of the microgrid system have flexibility and variability, the change condition of control parameters needed when disturbance occurs is analyzed and obtained, and a control strategy for self-optimization of the virtual inertia coefficient and thevirtual damping coefficient is provided accordingly; A small signal model is established to analyze the response characteristics of the DC / DC converter under the proposed DC microgrid virtual inertiaand damping coefficient self-optimizing control strategy, and the influence of key control parameters on the system response characteristics and the system stability is discussed. And finally, a direct-current microgrid model is established in PSCAD / EMTDC for simulation analysis, and the comparison result verifies the correctness and effectiveness of the provided control strategy.

Description

technical field [0001] The invention belongs to the field of DC micro-grid operation control, and more specifically relates to a DC micro-grid virtual inertia control method and system considering parameter self-optimization. Background technique [0002] The excessive exploitation and utilization of fossil energy has caused resource depletion and environmental pollution. The energy situation faced by human society is becoming more and more severe. Therefore, countries all over the world attach great importance to the development of renewable energy. The importance of distributed power generation technology with renewable energy as the main body and the micro-grid built by distributed power generation units has become increasingly prominent. Microgrid mainly includes DC microgrid and AC microgrid. Compared with AC microgrid, DC microgrid has the advantages of simple conversion device and lower cost, and DC microgrid does not need to consider reactive power and frequency issu...

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Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides a DC microgrid virtual inertia control method and system considering parameter self-optimization, thereby solving the problem that traditional droop control cannot solve the small inertia of DC microgrid system and the busbar The technical problem that the voltage is greatly affected by power fluctuations

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