Design And Control Of High Current Xenon Lamp Pulse Power Supply

As an important simulation light source for photovoltaic panel detection,xenon lamp is regarded as the most suitable sunlight simulation light source because of its characteristics of high spectral matching,fast response speed and high brightness.Therefore,xenon lamp pulse power source has been widely studied and applied.Aiming at the problem of uncontrollable discharge current of traditional xenon lamp power source,this thesis analyzes the basic characteristics of xenon lamp light source in detail,Based on this,a multi-stage discharge xenon lamp pulse power supply system is proposed,and the control strategy of the main circuit is optimized to improve the system performance,which can output flat top pulse with adjustable discharge current amplitude and width,so as to simulate the sunlight with different illumination intensity and illumination duration.Firstly,based on the analysis and discussion of the non-linear characteristics of the xenon lamp load and the discharge characteristics,the optimal design of the system scheme is carried out from the perspective of reducing the power supply,improving the discharge circuit,and reducing the volume The high-voltage charging power supply is used to supply power to the main circuit and pre-combustion simultaneously,so as to solve the problem of the large number of power supplies required by the traditional xenon lamp power supply;further,by using a single-phase PWM rectifier(VSR)topology,the energy storage capacitor can be rectified and charged directly through the municipal power,Compared with the traditional two-stage charging circuit using diode uncontrolled rectification,it can effectively reduce the volume and harmonic content of the power supply;In addition,the traditional xenon lamp power supply with thyristor discharge cannot achieve current controllable current.Buck converter is used as a pulse discharge circuit to achieve controllable discharge current,and the interleaved parallel structure reduces current stress,improves output power,and achieves high current output.Secondly,the main circuit control of xenon lamp pulse power supply is studied and improved.For the high-voltage charging circuit(VSR),by adding a pre-charging circuit,the current spike generated when the capacitor is charged can be effectively avoided;considering that the traditional double closed-loop PI control cannot track the AC amount.Introduced an orthogonal signal generator(LO-OSG)based on the Luenberger observer,which improved the OSG’s ability to resist higher harmonics and generated a virtual orthogonal vector,referring to the three-phase VSR,a vector control strategy based on d/q coordinate transformation was adopted.The problem of mutual coupling between active and reactive components is solved by decoupling control,and the energy storage capacitor is charged by the charging mode of constant current and then constant voltage.At the same time,for the pulse discharge circuit(Buck),in order to solve the inherent current imbalance problem of the interleaved parallel topology,in view of the coupling between the traditional current sharing control loops,According to the disturbance equation,the decoupling condition is analyzed,and a decoupling current sharing control strategy is proposed,It can be achieved that when the power loop or the current sharing loop is disturbed,they are not affected by each other.In addition,in view of the nonlinear characteristics of the load,in order to realize the constant current control of the load,a CVC three-loop control with the load current as the outer loop,the output voltage as the middle loop,and the inductor current as the inner loop is proposed to stabilize the output voltage during no-load operation.And play the role of current limiting protection,by changing the load current reference value,to achieve constant current multi-stage discharge.Finally,the hardware circuit design of the xenon lamp power supply system is carried out,including the main circuit and the control circuit.Combined with hardware design and software control,an experimental platform is built,and the simulation is verified by experiments,which realizes high-voltage charging and high-current multi-stage discharge.