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Single-phase and three-phase electric energy quality controllers with novel structures

A technology of power quality and controller, applied in AC network voltage adjustment, harmonic reduction device, AC network to reduce harmonics/ripples, etc., to achieve light weight, simple structure, and improved voltage quality

Inactive Publication Date: 2011-05-18
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is to construct a single-phase power quality controller and a three-phase power quality controller with a new structure, and overcome the technical problem that the existing technology cannot simultaneously improve voltage quality and current quality at low cost

Method used

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  • Single-phase and three-phase electric energy quality controllers with novel structures
  • Single-phase and three-phase electric energy quality controllers with novel structures
  • Single-phase and three-phase electric energy quality controllers with novel structures

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Embodiment Construction

[0030] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0031] Such as figure 1 As shown, the specific embodiment of the present invention is: a single-phase power quality controller with a new structure of the present invention, including a bidirectional power semiconductor switch S1, load-side inverters (S2, S3), grid-side inverters (S4 , S5), the first low-pass filter (L1, C1) connected to the load, the second low-pass filter (L2, C2) connected to the grid, and the load-side inverter (S2, S3) includes an inverter bridge The switching tube S2 and the inverter bridge switching tube S3, the load side inverter (S2, S3) is sequentially connected in series by the inverter bridge switching tube S2 and the inverter bridge switching tube S3, and the grid side inverter (S4 , S5) include inverter bridge switch tubes S4 and S5, the grid-side inverter (S4, S5) is sequentially connected in series by inverter bri...

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Abstract

The invention relates to single-phase and three-phase electric energy quality controllers with novel structures. In the single-phase electric energy quality controller with the novel structure, a load side inverter comprises an inverter bridge switching tubes and is sequentially connected in series by two of the inverter bridge switching tubes; a power grid side inverter comprises inverter bridgeswitching tubes and is sequentially connected in series by two of the inverter bridge switching tubes; a two-way semiconductor power switch and a first low-pass filter are connected in series betweena power grid and a load; the connection point of the two inverter bridge switching tubes of the load side inverter is connected with the connection point of the two-way semiconductor power switch andthe first low-pass filter; and the connection point of the two inverter bridge switching tubes of the power grid side inverter is connected to the power grid after being connected in series with a second low-pass filter. The electric energy quality controllers provided by the invention replace a series transformer with the two-way semiconductor power switch, thereby not only having the function of simultaneously improving the voltage quality and the current quality, but also having a simple structure and a light weight.

Description

technical field [0001] The invention relates to a power quality controller, in particular to a single-phase power quality controller and a three-phase power quality controller with a new structure. Background technique [0002] In the power system, various factors such as system faults, lightning strikes, nonlinear loads, and impact loads will cause non-ideal sinusoidal phenomena in grid voltage, current, and frequency, resulting in abnormal operation of some sensitive electrical equipment and power quality problems. At present, with the increase in the types and capacities of nonlinear high-power electric loads, such as high-power rectifiers and magnetic saturation devices, the power quality of the power system is more likely to deteriorate. However, the anti-electromagnetic interference ability of automatic equipment controlled by robots, computers, and microprocessors is declining, and the number is also increasing, which leads to more prominent power quality problems bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12H02J3/01
CPCY02E40/40
Inventor 和军平延汇文
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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