Two-level two-direction current transformer and control method thereof

Abstract

The invention discloses a two-level two direction current transformer and a control method of the two-level two direction current transformer. The inverter comprises a direct-current (DC) breaker, a DC filter, a DC / DC converter, a DC / alternating-current (AC) converter, an AC filter, an AC contactor I, an AC contactor II, an isolation transformer, an AC breaker, a DC / DC pulse-width modulation (PWM) drive circuit, a DC / AC PWM drive circuit, a control panel and a human-computer interface. The current transformer is simple in structure and low in cost. In the control method, the DC / AC converter and the DC / DC converter are controlled independently, so that the whole current transformer is of a modular structure without mutual interferences, distribution of electric energies is managed preferably, and fault diagnosis and inspection for a system are convenient.

Description

Technical field [0001] The invention relates to a two-stage bidirectional converter and a control method thereof, belonging to the technical field of power transmission and transformation. Background technique [0002] With the large-scale application of some non-linear and time-varying electronic devices, the current in the power grid contains a large number of harmonics and reactive components, resulting in serious distortion of the current waveform, causing harm to the production and transmission of electric energy, and also affecting electronic equipment usage of. [0003] The battery has the problem of too large or too small charging current in the early and later stages of charging. If the current ripple is too large, it will cause harm to some current ripple-sensitive batteries. When the battery is discharged, the converter works in the discharge mode, and the charging and discharging of the inductance in the circuit will inevitably cause the output current ripple of the ba...

AI Technical Summary

Problems solved by technology

[0002] With the large-scale application of some nonlinear and time-varying electronic devices, the current in the power grid contains a large number of harmonics and reactive components, resulting in serious distortion of the current waveform, which brings harm to the production and transmission of electric energy, and also affects electronic equipment. usage of

[0003] The battery has the problem of too large or too small charging current at the initial and later stages of charging. If the current ripple is too large, it will cause harm to some current ripple-sensitive batteries.

When the battery is discharged, the converter works in the discharge mode, and the charging and discharging of the inductance in the circuit will inevitably cause the output current ripple of the battery

At present, bidirectional converters have the disadvantages of poor system flexibility and poor configurability. To achieve harmonic suppression and reactive power compensation, the traditional method will configure a harmonic suppression and reactive power compensation device for the system, which undoubtedly increases System cost, low integration

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