Diesel-storage independent micro-grid and virtual dynamic synchronous control method and system thereof

A technology of synchronous control and micro-grid, which is applied in the fields of power supply and control of ships, islands, ports, and wharves. It can solve the problems of dynamic torque coefficient cannot be adaptively adjusted, continuous power oscillation, and slow dynamic adjustment speed, etc., to achieve rapid response improvement ability, reducing power oscillation amplitude, and improving dynamic performance

CN113890065APending Publication Date: 2022-01-04GUANGDONG ZHICHENG CHAMPION GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-01-04

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Abstract

The invention discloses a diesel-storage independent micro-grid and a virtual dynamic synchronous control method and system thereof, and self-adaptive dynamic synchronous torque and a pre-synchronous compensation phase angle are introduced into an energy storage converter control system to realize output voltage and power synchronization before and after the system is connected in parallel. According to the method, on one hand, the phase angles of the diesel generator and the energy storage converter are kept consistent before parallel connection by compensating a pre-synchronization phase angle, and current impact in the parallel connection process is reduced; on the other hand, by introducing the self-adaptive dynamic synchronous torque, after the systems are connected in parallel, the diesel generator can adaptively and dynamically adjust the virtual torque of the energy storage converter according to the current acceleration of the diesel generator and the energy storage converter under the condition that the inertia parameter of the diesel engine is black box; and the phenomenon that angular acceleration changes are inconsistent due to inertia difference is eliminated, the angular acceleration difference between the diesel engine and the energy storage converter is reduced, system power oscillation caused by impact loads is avoided, and synchronous power supply of the diesel engine and the energy storage converter is achieved.
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Description

technical field

[0001] The invention relates to the fields of power supply and control of sea islands, ports, wharves, and ships, in particular to an independent microgrid for diesel storage and its virtual dynamic synchronous control method and system. Background technique

[0002] The diesel-storage independent microgrid system has a small power supply scale and weak energy support capability. It requires the parallel synchronous output of diesel engines and energy storage converters to improve the voltage support capability to meet the power supply requirements of national defense and civilian high-power impact special loads. However, due to the inertia of the diesel generator set, when the energy storage converter with conventional droop control is connected in parallel with the diesel engine, the power distribution will be unbalanced in the dynamic process of the system, which will easily cause overcurrent of the power electronic equipment. Therefore, in order to match ...

Examples

Embodiment Construction

[0038] Such as figure 1 As shown, the diesel-storage independent microgrid system in one embodiment of the present invention, the diesel generator and the energy storage converter are connected in parallel to supply power to the conventional load and the pulse load. The control method, on the one hand, can reduce the impact of parallel connection through pre-synchronization control during parallel connection, and on the other hand, can dynamically adjust the energy storage converter when the diesel generator inertia parameters and control parameters are black-boxed during parallel operation. The virtual torque narrows the angular acceleration gap between the diesel engine and the energy storage converter, suppresses the system power oscillation caused by the impact load, and realizes the synchronous power supply of the two.

[0039] Such as figure 2 As shown, an energy synchronization control method in an embodiment of the present invention mainly includes pre-synchronizatio...