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Multifunctional power grid simulator and control method thereof

A power grid simulator and control method technology, applied in the direction of multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, single-net parallel feeding arrangement, etc., can solve the problem that cannot fully meet the test requirements of distributed power generation systems , the single function of the simulation device, and the inability to simulate grid faults, etc., to achieve the effect of facilitating grid harmonic testing, flexible working methods, and easy modularization

Inactive Publication Date: 2011-01-19
HEFEI UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, the function of the simulator is relatively single, and it cannot simulate various grid faults, so it cannot fully meet the test requirements of distributed generation systems

Method used

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  • Multifunctional power grid simulator and control method thereof
  • Multifunctional power grid simulator and control method thereof
  • Multifunctional power grid simulator and control method thereof

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Embodiment Construction

[0022] see figure 1 , in this embodiment, the main circuit adopts three single-phase systems to simulate the A, B, and C three-phases of the power grid, and each single-phase system is a back-to-back structure, so that the simulator can run in four quadrants and realize energy transfer to the power grid G give back. The voltage provided by the power grid G ​​is isolated by a three-phase transformer to supply power for the subsequent rectification link. The rectification link uses a three-phase PWM rectifier M1, which provides a stable DC side for the subsequent circuit and can realize energy feedback. Compared with the single-phase PWM rectifier, the three-phase rectifier can effectively reduce the secondary ripple on the DC side, the DC side voltage is relatively stable, and the AC side of the three-phase rectifier is powered by a three-phase power supply, with a larger load capacity, which is more suitable for High power occasions. The DC voltage output by the three-phase ...

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Abstract

The invention discloses a multifunctional power grid simulator and a control method thereof. The main circuit of the simulator is characterized in that three mutually independent back-to-back systems are provided; the mutually independent back-to-back systems have a structure form that the input sides are three-phase PWM (Pulse-Width Modulation) rectifier, and the output sides are controllable single-phase PWM inverters for outputting voltage; mains supply is connected to the three-phase PWM inverters after the isolation of a three-phase transformer; and the single-phase PWM inverters are outputted by an LC (Inductor-Capacitor) filter. The invention as a power grid voltage generating device in a distributed power generating synchronization research can be used for simulating to output standard grid voltage and the like, and provides a grid environment as real as possible for a distributed power generating system synchronization research so as to satisfy the requirements for distributed powder generating researches.

Description

technical field [0001] The invention relates to a grid voltage generating device, more specifically to a generating device for providing grid environment for a system in the research of distributed grid-connected power generation. Background technique [0002] The grid-connected operation of new energy power generation systems such as solar photovoltaic power generation devices and wind power generation devices is recognized by many energy and power experts in the world as saving investment, reducing energy consumption, and improving the reliability and flexibility of the power system. It is the development of the power industry in the 21st century. important direction. In order to ensure the safety of system installers and the reliable operation of the grid, the distributed generation system must meet the technical requirements for grid connection. As more and more distributed generation systems are connected to the grid, grid companies in various countries are all concerne...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/01H02J3/26
CPCY02E40/40Y02E40/50
Inventor 张兴刘芳王莹丁杰谢震杨淑英
Owner HEFEI UNIV OF TECH
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