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Virtual synchronous generator control method

A generator control and virtual synchronization technology, applied in the field of microgrid, can solve problems such as the decline of power regulation ability, and achieve the effect of reducing the influence of voltage, large voltage inertia and frequency inertia, and stable parallel operation.

Pending Publication Date: 2018-08-03
HUNAN UNIV
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Problems solved by technology

If the characteristics of line impedance are resistive and inductive, the power regulation ability will decrease due to power coupling

Method used

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Embodiment Construction

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention. .

[0032] In order to better illustrate the technical solution of the present invention, in combination with Figure 1-2 As shown, the present invention provides a specific embodiment of a virtual synchronous generator control method, including the following steps:

[0033] S1. Active power droop adjustment step, the active power droop adjustment step simulates the static and dynamic active power droop adjustment characteristics of the synchronous generator, changes the output angular frequency in real time according to the active power; changes the output torque in real time according to the power, and p...

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Abstract

The invention discloses a virtual synchronous generator control method, and provides an improved virtual synchronous generator control technology. The method mainly comprises an improved virtual synchronous control policy added with second-order voltage inertia and virtual impedance and voltage-current double closed-loop control. The improved virtual synchronous control policy introduces a second-order voltage inertia link and a virtual impedance link on the basis of traditional virtual synchronous control, which improves the voltage rigidity and stability of distributed power generation units. The second-order voltage inertia link reduces the voltage change rate, and filters out high-order harmonics of voltage. The virtual impedance link is added to reduce the power coupling degree of thedistributed power generation units. Through voltage-current double closed-loop control, the output voltage of a power supply accurately and rapidly responses to a command signal. According to the invention, stable parallel operation of distributed power generation units in an alternating current microgrid and stable adjustment of the active power of the alternating current microgrid are finally realized.

Description

technical field [0001] The invention relates to the fields of microgrid, motor and power electronics control, and relates to an improved virtual synchronous generator control technology, in particular to a virtual synchronous generator control method. Background technique [0002] Due to the urgent needs of environmental issues, new energy and energy storage power generation have attracted more and more attention from researchers in recent years. In order to improve the utilization rate and stability of the power generation system, distributed power generation units based on new energy and energy storage are a feasible option, and a microgrid composed of multiple distributed power generation units can increase system capacity and better energy efficiency. Do energy management. [0003] The traditional virtual synchronous generator control strategy is to simulate the transient and steady-state droop characteristics of the synchronous generator, and adjust the frequency and a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/42H02J3/48H02J3/50
CPCH02J3/42H02J3/48H02J3/50
Inventor 王俊彭子舜刘增戴瑜兴
Owner HUNAN UNIV
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