Triangular connection type comprehensive compensation system integrated with cascaded active filter and reactive compensator
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A source filter and comprehensive compensation technology, applied in active power filtering, reactive power adjustment/elimination/compensation, flexible AC transmission system, etc., can solve the problem of comprehensive control of APF and SVC, joint compensation and optimization research, research , research on undeveloped high voltage levels, etc.
What is AI technical title?
AI technical title is built by PatSnap AI team. It summarizes the technical point description of the patent document.
A source filter and comprehensive compensation technology, applied in active power filtering, reactive power adjustment/elimination/compensation, flexible AC transmission system, etc., can solve the problem of comprehensive control of APF and SVC, joint compensation and optimization research, research , research on undeveloped high voltage levels, etc.
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[0096] For the comprehensive compensation system of delta-connected cascaded active filter and reactive power compensator proposed by the present invention, it will be described in detail in conjunction with the drawings and embodiments.
[0097] Such as figure 1 As shown, a delta-connected cascaded active filter and reactive power compensator (SVC) comprehensive compensation system according to an embodiment of the present invention includes:
[0098] A triangularly connected N (such as figure 2 As shown in the figure, 10) cascaded converters and three-phase filter inductors connected to each N-level cascaded converter are shown in the figure. The topology of the converter is H inverter bridge cascaded structure, mainly Realize the harmonic current compensation for the power grid and TCR, and at the same time realize a certain compensation for reactive power and negative sequence components. The N value is determined by the grid voltage and the DC voltage of the single-stag...
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Abstract
The invention discloses a triangular connection type comprehensive compensation system integrated with a cascaded active filter and a reactive compensator. The system comprises triangular connection type N-grade cascaded converters and a three-phase filter inductor connected with each N-grade cascaded converter; triangular connection type thyristor reactors and star-shaped connection type thyristors are used for switching the reactive compensator composed of fixed capacitors; and the triangular connection type N-grade cascaded converters and the reactive compensator are connected in parallel between a connection node and a ground node of an input power grid voltage and a load. According to the system provided by the invention, reactive power and harmonic current in a medium-voltage power grid are subjected to dynamic compensation and the efficiency of the power grid is improved; when the system is used for compensating, the system has no negative influences on the power grid, and has advantages of stable system, simple structure, strong stability and flexibility in compensation.
Description
technical field [0001] The invention relates to the technical field of reactive power compensation and harmonic control, in particular to a delta-connected cascaded active filter and reactive power compensator comprehensive compensation system. Background technique [0002] There are a large number of inductive loads in the power grid, and the application of electric drive is more and more widely, so that there is a large amount of inductive reactive current in the power grid. At the same time, with the development of power electronics technology, more and more nonlinear loads are running in the power grid. A large number of harmonic currents are generated, causing electromagnetic pollution. In order to ensure the power quality of the power grid, it is necessary to compensate the reactive power and harmonics of the power grid. Therefore, dynamic reactive power compensation technology and active filter technology are two key technologies in the field of power quality. [000...
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