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Large-capacity stillness wattless occurrence apparatus

A technology of static reactive power generation and large capacity, which is applied in harmonic reduction devices, reactive power adjustment/elimination/compensation, flexible AC transmission systems, etc. The problems such as large current of the converter can alleviate the three-phase unbalance, filter out the harmonics of the power grid, and facilitate the distribution and control.

Inactive Publication Date: 2009-07-29
张皓
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  • Description
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Problems solved by technology

[0005] Due to the high technical difficulty, the current SVG products are still relatively few. Generally, low-voltage switching devices (1200V or 1700V) are used, and two-level circuits or three-level circuits are connected in parallel with the high-voltage power grid through a transformer. Due to the compensation capacity of the power grid The requirements are relatively large, and the power of the single machine is also relatively large (generally above several kkVar). Due to the low output voltage of the converter, the current of the converter is relatively large, and there are problems in product stability, reliability and technical difficulty. certain problem

Method used

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  • Large-capacity stillness wattless occurrence apparatus
  • Large-capacity stillness wattless occurrence apparatus
  • Large-capacity stillness wattless occurrence apparatus

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Embodiment Construction

[0032] Combine below figure 1 , 4 , 5, 6 and describe in detail the specific implementation of the present invention:

[0033] combine figure 1 , the main circuit structure of the present invention includes: an input transformer (2), a rectification and filtering unit (3), an inverter unit group (4), an output transformer (5) and a detection and control system (6), and the input transformer converts the grid high-voltage alternating current into The low-voltage alternating current suitable for the device is converted into direct current through the rectification and filtering unit to form a direct current bus connected to each inverter unit.

[0034] The rectification and filtering unit consists of six rectification diodes to form a three-phase bridge rectification circuit. The output of the rectification circuit is connected to the capacitor filter and becomes the DC bus shared by all the inverter units of the device.

[0035]Each inverter unit has the same structure and...

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Abstract

The invention discloses a high capacity static var generator, which comprises an input transformer, a rectifier and filter unit, an invert unit group and an output transformer that are sequentially connected. The work of the whole generator is controlled by a detection and control system. The invert unit group consists of 3N (N is not less than 1) invert units which share the same dc bus. The invert unit adopts a single-phase full-bridge inverter circuit and the output of each invert unit is connected in series with a reactor and then connected with the electric network through the output transformer. The high capacity static var generator is especially applicable for a high capacity reactive power compensation system and has the advantages of low cost, high reliability, continuously adjustable output power factors, fast response speed, high control precision, and the like.

Description

(1) Technical field [0001] The invention belongs to the technical field of grid reactive power compensation, and in particular relates to a large-capacity static var generator. (2) Background technology [0002] With the rapid development of social economy, the contradiction between supply and demand of power supply and power demand has become increasingly prominent. In addition to relying on the continuous improvement of the transmission voltage level, it is also necessary to improve the efficiency of power transmission and consumption to reduce network losses. Since there are a large number of resistive and inductive loads such as motors and transformers in the AC grid, a large amount of reactive power is injected into the grid during the operation of these devices, resulting in poor power factor of the transmission and distribution grid and increased line loss. [0003] In order to improve the efficiency of the transmission network, it is necessary to install a reactive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/01
CPCY02E40/12Y02E40/10Y02E40/40
Inventor 张皓
Owner 张皓
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