Virtual synchronous generator-based dynamic power compensation method of diesel storage hybrid independent micro-grid

Abstract

The invention discloses a virtual synchronous generator-based dynamic power compensation method of a diesel storage hybrid independent micro-grid. The method comprises a virtual synchronous generator control method for fixing virtual inertia and a damping parameter under the condition of steady-state operation of a system, a virtual synchronous generator control method for self-correcting the virtual inertia and the damping parameter under the condition of load disturbance on the system, and a virtual synchronous generator control method for negative inertia in a dynamic recovery process of a frequency of the system. By the virtual synchronous generator-based dynamic power compensation method, the frequency stability of a diesel storage hybrid independent micro-grid system comprising a micro-grid energy storage inverter under a steady-state condition is considered; reduction of frequency amplitude deviation of the system by the independent micro-grid system under the condition of the load disturbance is ensured; and fast recovery of the frequency of the system can also be ensured, so that the power supply quality of the system is effectively improved; and the virtual synchronous generator-based dynamic power compensation method can be widely applied to the independent micro-grid system for networking operation for the micro-grid energy storage inverter and a diesel generator set.

Description

technical field [0001] The invention relates to a dynamic power compensation method of a diesel-storage hybrid independent micro-grid based on a virtual synchronous generator, which is suitable for a micro-grid energy storage inverter that needs to be networked with a diesel generator set. Background technique [0002] In recent years, virtual synchronous generator (Virtual Synchronous Generator, VSG) technology, as a new type of distributed generation control technology, has been widely used in diesel-storage hybrid independent microgrid. As an efficient form of energy utilization, independent microgrid is an effective way to solve and improve the decentralized power demand in remote areas such as plateaus and islands. However, due to the loss of the support of the large power grid for the independent microgrid, and the slow dynamic performance and small moment of inertia of the diesel generator set, the inertia of the microgrid is very weak, resulting in rapid changes in t...

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Problems solved by technology

[0005] Entitled "Self-tuning virtual synchronous machine: a control strategy for energy storage systems to support dynamic frequency control", Miguel A. Torres L., Luiz A. C. Lopes, Luis A. Moran T., et al, IEEE Transactions on Energy Conversion, 2014, 29(4), 833-840 ("Self-tuning virtual synchronous generator: a control strategy for energy storage systems providing dynamic frequency support", "IEEE Journal-Journal of Energy Conversion", Vol. 29, No. 4, 2014 833-840 pages); this paper proposes a solution to improve the frequency stability of the independent microgrid system using the self-correcting virtual inertia and damping virtual synchronous generator technology. This control scheme increases the complexity of the control. And the amplitude deviation and recovery time of the frequency in the recovery process need to be further reduced

[0006] Titled "Power system stabilization using virtual synchronous generator with alternating moment of inertia", J. Alipoor, Y. Miura, T. Ise, "IEEE Journal of Emerging and Selected Topics in Power Electronics", 2015, 3(2), 451-458 ("The Stability Control Method of Power System Based on Virtual Synchronous Generator with Moment of Inertia", "IEEE Journal-Power Electronics Technology Special Topics", Vol. 3, No. 2, pp. 451-458 in 2015); this paper proposes Adaptive virtual inertia virtual synchronous generator technology controlled by "bang-bang" is used to suppress the system frequency oscillation when the command power of the grid-connected inverter changes suddenly. However, the frequency fluctuation problem under the load disturbance condition is not considered, and if Improper selection of its frequency change threshold will lead to system frequency oscillation

[0007] To sum up, none of the existing technologies can solve the problem of reducing the system frequency when the system is disturbed by the load in the diesel-storage hybrid independent micro-grid system in which the micro-grid energy storage inverter and the diesel generator set are networked. The magnitude of the deviation can ensure the rapid recovery of the system frequency

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