Feedforward control method and control system for brushless direct current power generation system

Abstract

The invention provides a feedforward control method and a control system for a brushless direct current power generation system. Rapid response is carried out on load changes through a load current feedforward element, when a large load is suddenly loaded or suddenly unloaded, the load current instantaneously generates a large change, and the load current feedforward element immediately participates in the adjustment of the exciting current If, so that the rapid dynamic response is achieved; when the slow load is changed, the output voltage is mainly controlled by a PI regulator, and the loadcurrent feedforward element changes the adjustment state according to the fluctuation condition of the detected load current, so that the whole system is more stable. When the load current fluctuatesslightly, the fluctuation amount of the small load current is corrected, the disturbance to the system since small load current fluctuations enter a feedforward component can be voided, and the anti-jamming capability of the system can be improved. The feedforward control method for the brushless direct current power generation system provided by the invention can cope with the voltage stabilization control requirement of a prime mover under a wide rotating speed changing condition, and the feedforward component fully considers the influence of the rotating speed, thereby improving the dynamicresponse capability of the system.

Description

technical field [0001] The invention relates to a closed-loop voltage regulation control method for a direct current power generation system, in particular to a feedforward control method for a brushless direct current power generation system. Background technique [0002] The voltage regulation control method of the brushless DC power generation system is a control method that takes equal samples of the excitation current and the output voltage, calculates and outputs the control signal through the control algorithm, and realizes the closed-loop control of the brushless DC power generation system to achieve stable output. [0003] Traditional brushless DC power generation system voltage regulation methods include double closed-loop control and three-loop control: double closed-loop control is a voltage regulation control method with the output voltage loop as the outer loop and the excitation current loop as the inner loop. Adjust the output voltage. Under this control meth...

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Problems solved by technology

[0003] Traditional brushless DC power generation system voltage regulation methods include double closed-loop control and three-loop control: double closed-loop control is a voltage regulation control method with the output voltage loop as the outer loop and the excitation current loop as the inner loop. Adjust the output voltage. Under this control method, when the load is suddenly added or unloaded, according to the external characteristics of the brushless DC generator, the load current and output voltage will fluctuate greatly. Due to the stability of the filter capacitor The output voltage changes slowly, and the closed-loop adjustment speed is slow only through the feedback of the output voltage, so the dynamic response of the system is slow and the stability is poor under this control method; in the three-loop control, the load current is added as the middle loop to form A three-loop voltage regulation control system is proposed, which can speed up the response speed of the voltage regulation control system and realize rapid adjustment of the output voltage. However, the traditional feedforward control method obtains the feedforward component according to the linear calculation of the load current, and a small change in the load current will cause Causes voltage closed-loop adjustment, which requires high control hardware detection circuits and sensors, and poor system anti-interference ability

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