Integrated static compensator of distribution transformer

Abstract

The invention discloses an integrated static compensator of a distribution transformer, comprising the distribution transformer, a static compensation module and a control platform, wherein each phase winding at a high-pressure side of the distribution transformer is provided with a connecting tap; the connecting tap is connected with an alternating current output side of the static compensation module; and the control platform controls the static compensation module to inject reactive power by the connecting tap so as to realize compensation. The integrated static compensator centralizes to compensate at a key node, thus improving the capacity of the static compensator of existing distribution networks and improving the quality of compensated output waveform.

Description

technical field [0001] The invention relates to the field of power systems, in particular to static compensators in power distribution systems. Background technique [0002] Static var compensator (hereinafter referred to as STATCOM) is one of the main equipment of power system power quality control, which plays an important role in power system dynamic reactive power compensation, load harmonic suppression, node voltage support and improvement of system stability. . The static var compensator (hereinafter referred to as D-STATCOM) used in the distribution network is usually installed near the low power factor load to realize local compensation. It has the advantages of less investment, good compensation effect, flexible and convenient use, etc. However, D-STATCOM also has the following problems to be improved: [0003] The voltage level of the 1D-STATCOM compensation device connected to the distribution network is low, and its compensation capacity is limited by the flow ...

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Problems solved by technology

[0003] The voltage level of the 1D-STATCOM compensation device connected to the distribution network is low, and its compensation capacity is limited by the flow capacity of the power electronic device, and insufficient compensation will occur when the load is heavy;

[0004] 2. The power electronic devices with larger currents have lower switching frequency, and the quality of the output compensation current waveform is reduced;

[0005] 3 The installation of compensation devices is scattered, lack of unified and coordinated management, and the utilization rate of the overall reactive power compensation capacity is not high;

[0006] 4 Installed at the end of the distribution network, unable to actively participate in the overall power quality control of the distribution network;

[0007] 5 It needs to be connected to the power grid through a coupling transformer or a large connection inductance, which increases the size and cost of the device

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