Power supply power fluctuation control method for pulse load

Abstract

The invention provides a power supply power fluctuation control method and system for a pulse load. The method comprises the steps of comparing an output voltage with an output voltage reference signal to obtain an output voltage deviation value; calculating the output voltage deviation value to obtain a current reference signal; performing low-pass filtering processing on the real-time load current to obtain a steady-state load current value, and performing amplitude limiting processing on the current reference signal through the steady-state load current value; comparing the output current with a final current reference signal to obtain an output current deviation value; calculating the output current deviation value to obtain a driving signal for power supply control; and enabling the output current to track the final current reference signal by the driving signal through a power circuit. The charging and discharging time of an energy storage capacitor is changed by adjusting the output current of the power supply, so that the input end of the power supply works in a relatively stable working state, the power supply power is kept stable, the input power fluctuation range of thepower supply side is greatly reduced, the effect of inhibiting power fluctuation is achieved, and the power utilization characteristic of the system is optimized.

Description

technical field [0001] The invention relates to the technical field of power supply conversion devices, in particular to a power fluctuation control method for pulse loads. Background technique [0002] As the energy guarantee of various industrial equipment, the power supply system is an essential element to ensure the reliable operation of the equipment, and plays a vital role in the normal operation of the equipment. In addition to the dedicated power supply network for large-scale ground equipment, various application platforms such as ships, mobile vehicles, and aircraft need to be equipped with mobile independent power systems that meet the power requirements of the equipment, forming an island-type micro-grid to supply power for each equipment in the system. An independent power system usually consists of steam turbine / diesel generator sets, backup energy storage and other equipment. Limited by size, weight, cost, single unit capacity and other constraints, the indep...

AI Technical Summary

Problems solved by technology

Different from traditional steady-state loads, pulse load equipment not only has a single impact on the power supply system when it is started and shut down, but also produces continuous and repeated loading and unloading power disturbances on the power supply system during its normal operation, causing power supply The system current changes greatly and frequently, which affects the output characteristics of the power supply system

[0004] Large-scale public power grids characterized by large-capacity and large-scale units on land, because of their nearly infinite capacity and very large system inertia, power disturbances caused by sudden load addition and unloading will not cause large fluctuations in grid voltage and frequency. The influence of the power grid is very small; while in the microgrid with small capacity, the situation is obviously different. Due to the small inertia of the microgrid, the response time of the electromechanical regulation controller is long, usually reaching the second level, while the duty cycle of the large pulse load equipment is milliseconds level, it is difficult to respond to changes in pulse load power in a timely manner through electromechanical control, resulting in poor ability of the microgrid to resist load disturbances, which brings difficulties to the analysis and control of microgrid operating characteristics under pulse loads, thus easily causing power quality problems to the power supply system, such as Harmonic current pollution, voltage fluctuations and flicker, grid voltage frequency fluctuations, etc., seriously affect the stability of independent power systems, and also bring problems such as economy and reliability

[0005] In island-type micro-grids, independent power systems or limited-capacity power supply systems, such as ships, mobile vehicles, aircraft platform generator sets, new energy power generation systems, etc., due to their limited power capacity and small moment of inertia, it is difficult to withstand pulse power loads Repeated, high-frequency sudden loading and unloading work characteristics lead to the failure of the power supply system to achieve a stable working state, causing power quality problems in the power supply system, mainly including harmonic current pollution, voltage fluctuations and flicker, etc., and even the generator set in severe cases The output voltage or frequency continues to drop until the unit is protected and shut down, unable to run

At present, there is no effective solution to the power fluctuation problem of the power system under such pulsating load conditions at home and abroad. The traditional solution is to add an energy storage capacitor at the output end of the power supply to provide the pulse load with the real-time peak load power required to stabilize the pulse. The influence of the load on the power supply, but as the pulse load gradually increases, the pulse load characteristics are also diverse, and the switching cycle, peak power, duty cycle, filter capacitor and other parameters are also different between different loads. This measure cannot solve the problem of the input terminal. power fluctuation problem

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