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Three-level NPC inverter structure virtual synchronous generator based on fuzzy control

A fuzzy controller and fuzzy control technology, applied in the field of electromechanical and automatic control principles, and power electronic AC-DC converters, can solve problems such as poor anti-interference ability, and achieve the effect of improving work performance, low interference, and small impact

Pending Publication Date: 2021-12-24
XIANGTAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of poor anti-interference ability of the traditional virtual synchronous generator, the present invention installs a fuzzy controller on the basis of the traditional VSG. to the value of the rated angular velocity of the system) and the differential dE of the angular velocity of the system as the input value of the fuzzy controller, and the output power compensation value P ad , and P ad with P ref add up

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  • Three-level NPC inverter structure virtual synchronous generator based on fuzzy control
  • Three-level NPC inverter structure virtual synchronous generator based on fuzzy control
  • Three-level NPC inverter structure virtual synchronous generator based on fuzzy control

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] The main topology of the three-level NPC inverter structure virtual synchronous generator based on fuzzy control is as follows: figure 1 As shown, two sets of DC power supplies are used for power supply, and the three-level NPC inverter converts the DC power into a three-phase AC power, L f , R f make up the output filter, R f ,C f make up the load.

[0020] In terms of control, its overall energy assessment mainly includes four aspects: load forecasting, energy forecasting, power generation plan, and exchange plan;

[0021] Signaled by the energy management to determine P ref (active power reference value) and Q ref (reactive power reference value), and in grid-connected mode, it can directly determine the value of output active power and output reactive power. Its active power P e and reactive power Q e The calculation of is based on the cal...

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Abstract

The invention discloses a three-level NPC inverter structure virtual synchronous generator based on fuzzy control. The main structure comprises a prime motor, an inverter, an output filter and a load. Compared with a two-level inverter structure used by a traditional virtual synchronous generator, the three-level NPC inverter is used, the problem that the withstand voltage of a power electronic switch is not high enough can be solved through the structure, and meanwhile, the virtual synchronous generator has the advantage of being low in output harmonic wave. A fuzzy controller is additionally arranged on the basis of traditional droop control and PI control, and the time for the angular velocity of the system to reach a steady state is not prolonged while a good suppression effect on the angular velocity overshoot of the system is achieved under the working condition of load switching. Moreover, the fuzzy controller is simple in structure, does not need to build a mathematical model, and reduces the workload compared with other control modes. Meanwhile, the introduction of the fuzzy controller does not change the original structural parameters of the system and does not affect the stability of the system.

Description

technical field [0001] The invention relates to the technical fields of power electronic AC-DC converters, electromechanics and automatic control principles, and in particular relates to a virtual synchronous generator with a three-level NPC inverter structure based on fuzzy control. Background technique [0002] The power electronic interface of the microgrid inverter does not have the large moment of inertia and frequency modulation and voltage regulation characteristics similar to synchronous generators, which has a negative impact on the stable operation of the power grid. In order to solve such problems, scholars have proposed a virtual synchronous generator, referred to as VSG (virtual synchronous generator), which takes the mathematical model of a traditional synchronous generator as the core and enables the inverter to have moment of inertia, active power frequency regulation and reactive power voltage regulation. characteristics. VSG enables new energy power genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M7/493H02J3/38
CPCH02M7/487H02M7/493H02J3/38
Inventor 郭有贵陈奇
Owner XIANGTAN UNIV