Abstract
At present, three-phase 115V/360-800Hz variable frequency AC power system is mostly used in the main power system of More-Electric Aircraft. With the increase of EMA (Electro-Mechanical Actuator), EHA (Electro-Hydrostatic Actuator), DC/DC power supply and power electronic devices in More-Electric Aircraft, harmonic and reactive power problems are brought, which seriously affect the power supply quality of variable frequency power supply for aircraft. According to the characteristics of high frequency and wide range of aviation variable frequency power supply, this paper studies a three-level active filter which can effectively improve the power quality of aviation variable frequency power supply system. This paper analyzes the working principle of the diode clamped three-level topology active filter, and deduces its mathematical model; proposes the frequency detection of the aviation variable frequency power supply based on the improved Rife method; the ip-iq method based on the instantaneous reactive power theory, accurately detects the harmonic current of the aviation variable frequency power supply system; uses the quasi PR controller to track the current, and improves the harmonic suppression effect. Finally, the experimental hardware platform is built to verify the feasibility of the proposed control strategy.
Highlights
With the rapid development of aviation technology, the frequency of airborne electronic equipment is higher and higher, which makes the problem of harmonic, reactive power and voltage imbalance more and more serious, so it affects the power supply quality of aircraft power supply system
In order to meet the requirements of the harmonic compensation effect of the aviation variable frequency power supply system, this paper proposes a quasi-proportional resonant controller based on the selected pre-corrected Tustin transformation method
According to the experimental results, it can be seen that after the Active power filter (APF) compensation of the power supply current in the aviation variable frequency power system, the THD is reduced to about 6%, and the power quality is significantly improved, which meets the requirement of THD less than 10% in the characteristics of aircraft power
Summary
With the rapid development of aviation technology, the frequency of airborne electronic equipment is higher and higher, which makes the problem of harmonic, reactive power and voltage imbalance more and more serious, so it affects the power supply quality of aircraft power supply system. In order to meet the requirements of the harmonic compensation effect of the aviation variable frequency power supply system, this paper proposes a quasi-proportional resonant controller based on the selected pre-corrected Tustin transformation method. Invert the DC component to obtain the fundamental positive sequence current in coordinate system: i+af i+bf It can be seen from the above formula that in the case of voltage asymmetry of aviation power supply, the correct positive sequence component of fundamental wave detected is independent of the phase error δ caused by voltage asymmetry. When the fundamental frequency of the aeronautical variable frequency power supply changes, the real-time frequency is transmitted to the quasi-PR controller in time through the above frequency detection method, and the harmonic cur-rent resonance frequency of ω0 and the following will change . In formula (19), y(k) is the output signal of the quasiPR controller, and x(k) is the input signal of the quasi-PR controller
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