Reactor switching module

Abstract

The invention discloses a reactor switching module. The reactor switching module comprises a reactor, a small resistor, three controllable switches and a controllable switch driving circuit, wherein the reactor is connected in parallel with the small resistor, a first end of the reactor is connected with a zero line LN of a three-phase four-wire system distribution network circuit, a second end of the reactor is connected with phase lines LA, LB and LC of the three-phase four-wire system distribution network circuit separately through the three controllable switches, two input ends of the controllable switch driving circuit are connected with an external master control circuit, and three output ends of the controllable switch driving circuit are connected with control ends of the three controllable switches separately. With the reactor switching module disclosed by the invention, time-division and phase-division compensation on three-phase sensing reactive power can be achieved; the problem of excessive compensation generated by purely employing a capacitor as a reactive power compensation device can be avoided when the reactor switching module and a capacitance compensation module are jointly used; the module is connected in parallel with the small resistor in a reactor branch, voltage impact and voltage oscillation generated during the switching process of the reactor can be reduced; and the module adopts the controllable switches to switch the reactor, the switching time point of the reactor can be accurately controlled, surge current generation is prevented, and thus, the switching process of the whole module is safe and reliable.

Description

technical field [0001] The invention relates to a reactor switching module used in a three-phase power optimization device. Background technique [0002] The asymmetrical operation of the distribution transformer will generate a large amount of negative sequence current and zero sequence current. These negative sequence current and zero sequence current will seriously pollute the power grid, greatly increase the power loss of the power grid, reduce the output of the transformer, and threaten the safety of the distribution transformer. operation, seriously affecting the quality of power supply. The national standard GB50052-2009 "Specifications for Power Supply and Distribution" and DL / T572-2010 "Transformer Operation Regulations" all have strict requirements on the size of the neutral line current and the unbalance of the three-phase current when the distribution transformer with Y / YN0 connection is running. . [0003] The three-phase power optimization device can not only...

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Problems solved by technology

[0004] The present invention improves on the deficiencies of the above-mentioned three-phase power optimization device, and designs a reactor switching module, which is connected to the A, B, C phase lines and the neutral line of the three-phase four-wire system distribution network line , can realize the phase-splitting compensation of inductive reactive power, avoid the overcompensation problem caused by simply using capacitors as reactive power compensation devices, and use multiple modules to realize time-sharing and phase-splitting compensation of three-phase inductive reactive power

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