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Isolated voltage compensation circuit

A voltage compensation and isolation technology, applied in electrical components, output power conversion devices, and AC networks to reduce harmonics/ripples, etc. The effect of absorption and recycling, reducing process requirements

Inactive Publication Date: 2011-10-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an isolated voltage compensation circuit without energy storage components, which uses an isolated AC-AC conversion circuit to realize grid voltage compensation and filter the grid voltage, and solves power quality such as voltage sudden drop, sudden rise, and continuous low voltage. question

Method used

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Embodiment Construction

[0033] specific implementation plan

[0034] see figure 1 , The isolated voltage compensation circuit of the present invention includes two parts, a primary side circuit and a secondary side circuit.

[0035] Such as figure 1 As shown, the primary side circuit includes:

[0036] a) The first primary side branch connected in parallel with the input power supply is formed by the first primary side winding N of the isolation transformer P1, with antiparallel diode D 1 The first power switch tube Q 1 , with antiparallel diode D 2 The second power switch tube Q 2 , the first filter inductor L 1 with the first filter capacitor C 1 Composition; with anti-parallel diode D 2 The second power switch tube Q 2 The emitter is connected to the positive terminal of the input power supply, with anti-parallel diode D 2 The second power switch tube Q 2 collector with the first filter inductor L 1 Connected to one end, the first filter inductor L 1 The other end of the filter capac...

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Abstract

The invention discloses an isolated voltage compensation circuit, comprising a primary side circuit and a secondary side circuit, wherein the primary side circuit comprises four power switching tubes with antiparallel diodes and two clamping capacitors only; a secondary output voltage is directly coupled to enter into a power grid by an isolation transformer so as to compensate a power grid voltage; in the isolated voltage compensation circuit, combination of every two power switching tubes can be realized by an IGBT (insulated gate bipolar transistor) half bridge module; the two clamping capacitors are utilized to clamp voltage spikes on the power switching tubes; and a built-in LC filter is used to reduce the high-frequency ripple component of the transformer. For the isolated voltage compensation circuit, a traditional PWM (pulse width modulation) method is applied, parts of power is utilized to convert, and a high-capacity DC (direct current) energy-storing link does not exist, thus the isolated voltage compensation circuit can compensate a harmonic voltage output by a diesel engine generator and solves the problems of voltage sag, voltage surge, continuous low voltage and other electric energy quality problems.

Description

technical field [0001] The invention relates to an AC-AC converter circuit, in particular to an isolated voltage compensation circuit which realizes grid voltage compensation and filters the grid voltage by using an isolated AC-AC conversion circuit. Background technique [0002] In independent power generation systems or distributed power generation systems with multi-energy hybrids such as wind-solar hybrids and wind-storage-storage hybrids, diesel engines driving synchronous generators to generate electricity are the most commonly used backup power solutions. When there is a failure of the new energy power generation device, or the power of the new energy generation part is insufficient, the diesel power generation device will be turned on to maintain the normal operation of the microgrid. However, when there are a large number of nonlinear loads in the microgrid, the load current will contain a large number of harmonic components; since the motor has a relatively high im...

Claims

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Application Information

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IPC IPC(8): H02M5/293H02M1/32H02J3/01
CPCY02E40/40
Inventor 邓焰李楚杉彭浩赵一刘全伟陈桂鹏
Owner ZHEJIANG UNIV
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