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Hybrid active filtering device suitable for LCC-HVDC system

A technology of LCC-HVDC and filter devices, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, power transmission AC networks, etc., can solve the problem of poor filtering effect, many filtering devices, and large footprint and other problems, to achieve the effect of excellent filtering performance, solve the tuning point offset, and occupy a small area

Pending Publication Date: 2021-03-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0004] The purpose of the present invention is to propose a hybrid active filter device suitable for LCC-HVDC systems, which can overcome the shortcomings of the current high-voltage direct current transmission filter devices, large footprint, large investment, and poor filtering effect

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  • Hybrid active filtering device suitable for LCC-HVDC system
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  • Hybrid active filtering device suitable for LCC-HVDC system

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Embodiment Construction

[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0015] The structure of a hybrid active filter device suitable for LCC-HVDC system is as follows: figure 1 As shown, it includes active filter, passive filter and control unit; the active filter includes sub-module SM of H-bridge structure (full control device IGBT, diode, DC side capacitor C SM ), output inductance L r etc.; passive filters include high-voltage capacitors, inductors, etc.; control units include current sensors, harmonic detection, current control, and carrier phase-shift modulation; Figure II It is the equivalent circuit diagram of the LCC-HVDC system and the hybrid active filter device, which explains the working principle of the hybrid active filter device from the perspective of the circuit. According to Kirchhoff's law, the harmonic equivalent circui...

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Abstract

The invention relates to a hybrid active filtering device suitable for an LCC-HVDC system, and belongs to a novel harmonic treatment method in high-voltage direct-current engineering. According to thehybrid active filter device, a 12 / 24-time single-tuned parallel passive filter is connected in series with a topological structure of a cascaded H-bridge-based active filter, a passive part bears most of high voltage, and the structure can effectively reduce the size and capacity of the active filter. According to the hybrid active filtering device, the ip-iq method based on the instantaneous reactive power theory is adopted to detect the load harmonic current, and the quasi-proportional resonance controller is adopted to track the harmonic current, so that the active filter can dynamically output compensation current which is equal to the load harmonic current in large reverse direction, power grid harmonic waves can be effectively filtered out, and harmonic control is realized.

Description

technical field [0001] The invention relates to a hybrid active filtering device suitable for an LCC-HVDC system, which belongs to the application field of high-voltage direct current and power electronic devices. Background technique [0002] At present, the ultra-high voltage DC projects and long-distance ultra-high voltage DC projects that have been operated in my country are all high-voltage direct current (LCC-HVDC) transmission projects based on grid commutation converters. Each pole of the UHV DC project is a double 12-pulse converter unit, which will generate 12k±1 characteristic harmonics during operation, requiring the installation of a large number of passive filter banks. These filters occupy a large area and are difficult to track The speed is slow and the dynamic adjustment ability is weak, so the dynamic characteristics such as overvoltage during the load shedding process cannot meet the system operation requirements. As a means of suppressing harmonic pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/36
CPCH02J3/01H02J3/36Y02E40/40Y02E60/60
Inventor 杜夏冰赵成勇杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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