Inverter of instantaneous voltage PID analogue controlled

Abstract

This invention discloses an inverse power supply for analog-controlling instantaneous voltages, in which, PID controller output end is connected with the input of the inverse supply, the output of which is connected with the input of the voltage sensor and the load, its output and a reference volume are connected with the negative and positive input of a subtracter, the output of which is connected with the input of the PID controller and the inverse supply is connected with the DC supply, which has the advantages of quick dynamic response, low rate of general harmonic aberration and accurate stability under non-linear load.

Description

technical field [0001] The invention relates to a power conversion circuit, in particular to an analog-controlled inverter power supply. Background technique [0002] With the development of science and technology and the improvement of informatization, on the one hand, important departments and electrical equipment have increasingly high requirements for power supply quality; on the other hand, the extensive use of power electronic equipment and the continuous increase of nonlinear loads make the harmonic Pollution is very serious, forming a sharp contradiction between supply and demand. For this reason, the research of high-performance PWM inverter power supply has attracted more and more attention in recent years. [0003] The instantaneous voltage PID control method has the characteristics of simple algorithm, easy implementation, good robustness and high reliability. The early inverter power supply was adjusted by a single-loop PID analog controller. The disadvantages ...

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Problems solved by technology

[0003] The instantaneous voltage PID control method has the characteristics of simple algorithm, easy implementation, good robustness and high reliability. The early inverter power supply was adjusted by a single-loop PID analog controller. The disadvantages are: due to the poor design and application of the controller , the dynamic performance of the system is not satisfactory, especially when the load is nonlinear; since the PID control cannot realize the tracking of the sinusoidal command without static error, for the system with high requirements, the dynamic characteristics and steady state that meet the system requirements cannot be achieved. Accuracy, so the inverter power supply system often adds an outer loop mean value feedback to ensure the steady-state accuracy of the system

The reasons why the single-loop PID control of the inverter power supply is not ideal are: on the one hand, the no-load damping of the inverter power supply is small, the open-loop operation oscillates violently, the convergence speed is slow, the characteristics of the control object are bad, and the load conditions are complex and changeable; on the other hand, the PID The parameters of the controller have not established a direct quantitative relationship with the performance indicators of the control system, and the optimal control parameter values ​​suitable for various load operating conditions have not been found. Therefore, the PID controller cannot show a good regulating effect

[0004] For this reason, many literatures propose various control schemes, for example, ①Adopt the double closed-loop control mode of the voltage outer loop and the current inner loop, and improve the dynamic performance of the inverter power supply through the current inner loop, so that the output performance of the inverter power supply is greatly improved , the deficiency of the double closed-loop control is mainly: in order to suppress the nonlinear load disturbance, the current inner loop must have a sufficiently high bandwidth to obtain satisfactory performance, which increases the difficulty of the controller implementation

②Adopt the composite control method of PID control and repetitive control, use the inner loop PID control to improve the dynamic response of the inverter power supply, and use the outer loop repetitive control to improve the steady-state accuracy of the inverter power supply. The algorithm of this composite control method is complex, so it is difficult to realize

These control methods make the system structure complex and costly

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