Chain SVG device with active filter function

A chained and functional technology, applied in circuit devices and AC networks to reduce harmonics/ripples, reactive power adjustment/elimination/compensation, etc., can solve capacity constraints and cannot be directly connected to 10kV or higher voltage levels Power grid and other issues, to achieve the effect of high device reliability, favorable market promotion, low cost and space occupation

CN104852388AActive Publication Date: 2015-08-19南京国电南自新能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-08-19

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Abstract

The invention discloses a chain SVG device with an active filter function, which comprises a control unit, three active power modules, a plurality of passive power modules and a grid-connected transformer. Three phases of the chain SVG device adopt a Y type or a delta type to be connected onto the power grid via an isolation transformer. The active filter function of the chain SVG device is realized in a way in which a harmonic current controller in an integrated compensation controller generates modulation waves containing corresponding harmonic elements, and voltage containing the corresponding harmonic elements is outputted via the active power modules. The reactive power compensation function is realized in a way in which a reactive power current controller in the integrated compensation controller generates modulation waves only containing fundamental wave elements, and all power modules are serially connected to output the fundamental wave voltage. One device has the reactive power compensation function and the active filter function at the same time, and the problems that the prior electric energy treatment device is high in cost, the device is complicated, and reliability is high can be solved.
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Description

technical field

[0001] The invention relates to a chained SVG device with an active filter function, belonging to the technical field of electric energy management. Background technique

[0002] In the power system, the wide application of various large-capacity electrical equipment such as rolling mills, electric arc furnaces, hoists, and electric locomotives has brought about a series of problems such as voltage fluctuations, three-phase unbalance, low power factor, and voltage harmonics. Power quality issues. Especially in recent years, large-scale wind power, photovoltaic and other new energy power are connected to the grid, which poses a challenge to the voltage stability of the power system. In this context, reactive power compensation devices and harmonic compensation devices gradually appeared and quickly entered the market, which played a positive role in solving power quality problems and improving the reliability of power systems. At present, the reactive power ...

Examples

Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0023] like Figure 4 As shown (only the A-phase circuit is drawn in the figure, and the B and C phases have the same structure as the A-phase), the chain-type SVG device with active filtering function of the present invention mainly includes a control unit, three active power modules, several One passive power module and one grid-connected transformer. The control unit is composed of a detection loop, a control loop and a comprehensive compensation controller. The detection loop is composed of signal conversion elements such as PT and CT and a signal conditioning circuit, which detects the voltage, current and other signals of the chained SVG device and converts them into digital quantities. It is read by the comprehensive compensation controller. The control loop is connected and communicated with the active power module and the passive power mod...