Method and device for restraining power-frequency ripple current

Abstract

The invention discloses a method and a device for restraining power-frequency ripple current. The device comprises an energy power supply, a bidirectional DC/DC (direct current/direct current) converter, a filter capacitor C3, an energy buffer capacitor C4 and a low-pass filter circuit, for sampling voltage, of the energy buffer capacitor, an energy power supply current detecting unit and a low-pass filter circuit of the detecting unit, a voltage reference Vref of C4, a current ripple restraining error amplifier EA1, a voltage control loop error amplifier EA2 of C4, a summing circuit of EA1 and EA2, and loads. By the device, restraining of energy power supply power-frequency ripple current is achieved under single-point current sampling, the defect that power-frequency ripples cannot be filtered effectively when large-capacity capacitors are used is overcome, and system cost is lowered while sampling lose is reduced and system efficiency is increased.

Description

technical field [0001] The invention relates to the field of switching power supply converters, in particular to suppression of power frequency ripple current of energy supply power supply, isolation and non-isolation switching conversion devices and control methods thereof. Background technique [0002] Energy is one of the main foundations for the development of modern civilized society. With the increasing consumption of traditional mineral energy, such as oil and coal, energy issues have become the focus of human society and a major issue that must be solved. In order to solve the current energy shortage problem, countries around the world have invested a lot of manpower and material resources in research on the development and utilization of new energy. Solar energy is not only renewable, but also clean and pollution-free or low-pollution, with huge reserves. A fuel cell is an electrochemical device that continuously converts the chemical energy in a continuously suppl...

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Problems solved by technology

For example, the maximum power tracking of solar photovoltaic power generation can improve the utilization rate of solar energy, but the power frequency ripple of the load is coupled to the solar photovoltaic power generation system, which will affect its maximum power tracking accuracy, resulting in a decline in the utilization rate of solar energy; because the fuel cell is controlled by a mechanical device The supply of fuel gas leads to poor transient characteristics of the fuel cell output, and the power fluctuation of the load will lead to fluctuations in the output power of the fuel cell, affecting its power generation efficiency, and in serious cases will shorten the life of the fuel cell, so how to suppress the energy supply on the switching power conversion device The power frequency ripple current of the power supply is a problem that needs to be solved

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