Dynamic Power Angle Adjustment Method, System and Related Components of Virtual Synchronous Inverter

A technology of virtual synchronization and adjustment method, applied in the direction of single-grid parallel feeding arrangement, etc., can solve problems such as difficulty in adapting to large-scale microgrids, complex system stability problems, etc., to increase the limit cutoff angle and improve transient power angle stability. type, the effect of large deceleration area

Active Publication Date: 2021-03-12
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

With the expansion of the microgrid scale, it is difficult to adapt the adaptive method of switching virtual synchronous inverter control parameters to large microgrids. Any combination of parameter switching processes will cause oscillations during the operation of virtual synchronous inverters, which may cause Make the stability of the system more and more complicated

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  • Dynamic Power Angle Adjustment Method, System and Related Components of Virtual Synchronous Inverter
  • Dynamic Power Angle Adjustment Method, System and Related Components of Virtual Synchronous Inverter
  • Dynamic Power Angle Adjustment Method, System and Related Components of Virtual Synchronous Inverter

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Embodiment Construction

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] Most of the existing large-disturbance power angle adjustment strategies focus on the change of the inverter's own control parameters, and there are different control parameter switches in different situations. With the expansion of the microgrid scale, it is difficult to adapt the adaptive method of switching virtual synchronous inverter control parameters to large microgrids. Any combination of parameter switching processes will cause oscillations duri...

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Abstract

The invention discloses a dynamic power angle adjusting method of a virtual synchronous inverter. The method comprises the following steps: judging whether a real-time power angle of the virtual synchronous inverter exceeds a first early warning angle or not; if yes, reducing a reference input power of the virtual synchronous inverter according to a preset rule so as to increase a deceleration area of the virtual synchronous inverter; judging whether the real-time power angle exceeds a second early warning angle or not; and if so, removing the virtual synchronous inverter from the network. According to the method, the reference input power between the first early warning angle and the second early warning angle is adjustable; therefore, the deceleration area is larger than that when a fixed reference input power is used, a limit cut-off angle is increased, the normal operation of the inverter in a steady state is not influenced, the transient power angle stability of the virtual synchronous inverter is improved, and the operation reliability of the micro-grid is improved. Correspondingly, the invention further discloses a dynamic power angle adjusting system and device of the virtual synchronous inverter and a readable storage medium.

Description

technical field [0001] The invention relates to the field of microgrid control, in particular to a dynamic power angle adjustment method, system and related components of a virtual synchronous inverter. Background technique [0002] At present, a well-run microgrid has the ability to operate stably in the island and grid-connected states at the same time, and can realize the seamless switching between the island and grid-connected operation modes, effectively improving the power supply reliability of the power system. [0003] In the microgrid, the virtual synchronous inverter effectively simulates the output characteristics of the synchronous generator by simulating the rotor swing equation of the traditional synchronous generator and changing the duty cycle of the internal switch tube control signal in real time, and effectively overcomes the traditional inverter It has good dynamic characteristics and solves problems such as low inertia and weak damping of the inverter. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/40
CPCH02J3/40
Inventor 谈赢杰袁智勇马溪原雷金勇喻磊胡洋黄安迪陈柔伊
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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