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Virtual synchronous generator control method of direct current micro-grid energy storage unit DC-DC converter

A DC micro-grid and generator control technology, applied in parallel operation of DC power supplies, DC network circuit devices, electrical components, etc., can solve problems such as low stability margin, poor suppression effect, lack of synchronous generator inertia and damping characteristics, etc. , to achieve the effect of good safe and stable operation and promotion of safe and stable operation

Active Publication Date: 2017-09-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Description
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AI Technical Summary

Problems solved by technology

However, the droop control method adopted by the existing DC-DC converter lacks the inherent inertia and damping characteristics of the synchronous generator, and cannot provide inertial and damping support for the DC microgrid, and the suppression effect on the DC voltage mutation and active power fluctuation is poor. lead to a low stability margin of the system

Method used

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  • Virtual synchronous generator control method of direct current micro-grid energy storage unit DC-DC converter
  • Virtual synchronous generator control method of direct current micro-grid energy storage unit DC-DC converter
  • Virtual synchronous generator control method of direct current micro-grid energy storage unit DC-DC converter

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Embodiment 1

[0029] refer to Figure 1-Figure 4 , a virtual synchronous generator control method for a DC-DC converter of a DC microgrid energy storage unit, establishing a DC microgrid system including an energy storage unit: the DC microgrid system includes a distributed power generation unit, an energy storage unit, Large power grid unit and load unit, the distributed generation unit, energy storage unit, large power grid unit and load unit respectively through the corresponding voltage source converter (Voltage Source Converter, VSC) or DC-DC converter (DC -DCConverter) is connected to the DC busbar; the distributed power generation unit, energy storage unit, large power grid unit and load unit included in the DC microgrid system all include control systems, measuring elements and converters; the DC microgrid system includes The input ends of the control system of the distributed generation unit, the energy storage unit, the large power grid unit and the load unit are connected to the ...

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Abstract

The invention discloses a virtual synchronous generator control method of a direct current micro-grid energy storage unit DC-DC converter. The virtual synchronous generator control method comprises a signal measurement step, a direct current busbar voltage reference value calculation step, a double-closed loop control step, a duty ratio calculation step, and a PWM modulation step. By adopting the virtual synchronous generator control method, a voltage regulation capability of an energy storage unit is realized, and at the same time, by introducing the inertia and damping external characteristics of the conventional synchronous generators, the safe and stable operation of the direct current micro-grid is facilitated.

Description

technical field [0001] The invention relates to a method for controlling a virtual synchronous generator, in particular to a method for controlling a virtual synchronous generator for a DC-DC converter of a DC microgrid energy storage unit, and belongs to the technical field of power supply control. Background technique [0002] With the increasingly severe energy shortage and environmental problems, distributed power generation technologies such as photovoltaics, wind power, and energy storage have received widespread attention. Due to a series of outstanding advantages of using DC transmission inside the DC microgrid, it has broad development prospects under the situation of DC micro-source and DC load utilization rate increasing day by day. However, the DC microgrid based on a large number of power electronic converter interfaces has a very fast response speed and a low degree of system inertia. When disturbances or power supply and demand imbalances occur, it is easy to ...

Claims

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Application Information

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IPC IPC(8): H02J1/10
CPCH02J1/102Y02P80/14
Inventor 朱晓荣谢志云
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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