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Uniform electricity quality regulator based on T-type three-level inverter and regulating method thereof

A technology of power quality and regulator, applied in AC network voltage adjustment, AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as complex DC voltage balance control

Active Publication Date: 2014-08-20
NANJING INST OF TECH
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Problems solved by technology

The main circuit topology is one of the core components of UPQC. The most widely used in the existing multi-level main circuit topology is the diode-clamped three-level circuit, which realizes the neutral point voltage clamping by introducing diodes, but DC Voltage Balance Control Gets Complicated

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  • Uniform electricity quality regulator based on T-type three-level inverter and regulating method thereof
  • Uniform electricity quality regulator based on T-type three-level inverter and regulating method thereof
  • Uniform electricity quality regulator based on T-type three-level inverter and regulating method thereof

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Embodiment Construction

[0027] In order to further describe the technical features and effects of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] As shown in 1, a microgrid unified power quality regulator based on T-type three-level technology includes a power detection device 1a for detecting power, a load detection device 1b, a series converter 2, and a parallel converter 3 , energy storage unit 4, Hall sensor 5, analog quantity acquisition unit 6, main control digitizer 7, and drive circuit 8, the three-phase live circuit of the series converter 2 is connected in series by an autotransformer after the LC filter circuit In the power grid, the parallel converter 3 is connected to the power grid in parallel through an LC filter circuit, the energy storage unit 4 is connected to the series converter 2 and the parallel converter 3 at the same time, and the power detection device 1a is simultaneo...

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Abstract

The invention discloses a uniform electricity quality regulator based on a T-type three-level inverter. The uniform electricity quality regulator based on the T-type three-level inversion technology and a control method of the uniform electricity quality regulator resolve the problem about the electricity quality of a micro power grid. A source and load detection device is used for detecting the real-time conditions of a power source and a load of the micro power grid; a serial-connecting inverter is used for being connected between the power source and the load in series; a parallel-connecting inverter is used for being connected on the load side in parallel; a direct current side energy-storing unit is used for storing energy; a Hall sensor is used for measuring the current and voltage information output by the inverters; an analog acquisition unit converts analog signals into a digital quantity through an external AD in a concentrating mode; a main digital controller is used for achieving the functions of operating state judgment, data analysis and the like; and a driving circuit is used for achieving output of PWM signals and protection over fault hardware. According to a control strategy of a T-type three-level inverter UPQC, a modified quasi proportional resonant current control strategy and a neutral-point voltage balance control strategy of PWM pulse optimizing switchover are provided.

Description

technical field [0001] Unified Power Quality Conditioner, or UPQC, is a comprehensive compensation device that can effectively solve most power quality problems. The invention relates to a micro-grid unified power quality regulator and a control method based on T-shaped three-level technology, belonging to the field of smart grids. Background technique [0002] Micro-grid is a system composed of micro-power sources and loads. The power quality problems are analyzed as follows: In micro-grids, in addition to the influence of load changes, fluctuations in the output power of micro-power sources will also cause voltage flicker; in addition, nonlinear loads A large number of harmonics will be generated, which will cause the imbalance of the three-phase voltage of the power grid; at the same time, the micro power supply and various power electronic converters will also generate certain harmonics, which will affect the normal operation of the micro grid. [0003] In view of the a...

Claims

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Application Information

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IPC IPC(8): H02J3/12H02J3/01
CPCY02E40/40
Inventor 张亮水恒华张丹
Owner NANJING INST OF TECH
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