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AC/DC Power Grid System Control Method and Its Application Control Model

A power grid system and control model technology, applied in the direction of electrical components, can solve problems such as voltage and power fluctuations, insufficient equipment maturity, and lack of reference value for steady-state models, achieving the effect of increasing accuracy and voltage stability

Active Publication Date: 2020-06-23
JIANGSU ELECTRIC POWER CO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Moreover, the research on AC and DC distribution networks is still in the preliminary stage, and the maturity of equipment is insufficient, which will inevitably lead to fluctuations in voltage and power during the initial operation of the system. Therefore, the steady-state model of the system lacks certain reference value for practical applications.

Method used

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  • AC/DC Power Grid System Control Method and Its Application Control Model
  • AC/DC Power Grid System Control Method and Its Application Control Model
  • AC/DC Power Grid System Control Method and Its Application Control Model

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Embodiment

[0060] The AC / DC power grid system control method involved in this embodiment includes the following steps:

[0061] S1, a converter is provided between the AC side and the DC side of the AC-DC grid system, and the converter and the AC side have a common connection point, surrounding the converter in the AC-DC grid system, simplifying the converter and its The equivalent circuit on the AC side is as figure 1 shown. There is a filter on the AC side of the converter VSC, and the converter is equivalent to a combination of an ideal bridge circuit, an equivalent loss resistance and a filter inductance, and the equivalent circuit considers the equivalent loss resistance of the converter VSC and the filter Inductance parameters (L c , R c ), the AC side circuit connected to the common connection point PCC is equivalent to a voltage source and impedance (L g , R g ) in series; at the same time, the actual synchronous coordinate system and the control model synchronous coordinate...

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Abstract

The invention relates to an AC-DC power grid system control method and a control model used therein, which belong to the technical field of supply and distribution power grid system. The method includes the following steps: establishing a dynamic equation used to deduce the time-domain relationship between the voltage and current on the AC side of a converter by simplifying the converter and the equivalent circuit on the AC side of the converter, and linearizing the dynamic equation at an operation point; respectively establishing a phase-locked loop linear model, a current inner loop linear model and a voltage outer loop linear model, and integrating the models into a complete control mode; and finally, using the model to realize stable voltage output of the AC-DC power grid system through PWM modulation.

Description

technical field [0001] The invention relates to an AC / DC power grid system control method and an applied control model thereof, belonging to the technical field of power supply and distribution network systems. Background technique [0002] The traditional AC system can no longer adapt to the development of the future power grid. Whether it is limited to the transmission capacity or to adapt to the DC power supply, load or high-frequency power supply and load, the traditional AC system must undergo an innovation to cope with future development. The study found that the DC grid can well make up for the shortcomings of the traditional AC grid. Naturally, the DC grid has become a research hotspot and is expected to completely replace the AC grid in the near future. As an intermediate process, the research and application of AC and DC power grids has become an imminent technical difficulty. [0003] Since the AC-DC conversion is a complex process, the stable output control stra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J5/00
Inventor 朱红张明马洲俊嵇文路徐青山将贤强王立伟王春宁许洪华梁硕奚康
Owner JIANGSU ELECTRIC POWER CO
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