DC-DC power supply control method capable of avoiding system oscillation
A DC-DC and power control technology, applied in the direction of control/regulation system, electrical components, and regulation of electrical variables, can solve problems such as system oscillation, large overshoot, and accumulation of integral effects of PID controllers, so as to avoid system oscillation, The effect of increasing lifespan
Active Publication Date: 2021-02-26
XIAN THERMAL POWER RES INST CO LTD
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However, at the initial stage of the system, there is a large deviation between the preset value of the controlled object and the actual output. At this time, the integral link will cause the accumulation of the integral action of the PID controller, making the controlled quantity exceed the error allowable range of the controlled object. Cause large overshoot, cause system shock, and finally cause system instability
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[0027] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings.
[0028] Such as figure 1 As shown, r(t) is the reference command; y(t) is the actual output; e(t) is the deviation value between the reference command and the actual output; u(t) is the corresponding control rate.
[0029] The traditional PID control strategy consists of two parts, the PID controller and the controlled object. The deviation between the actual output of the controlled object and the reference command is used as the input of the PID control. The corresponding control rate u(t) obtained by the PID control according to the control algorithm is:
[0030]
[0031] In formula (1): K P is the proportional coefficient; T I is the integral time constant; T D is the differential time constant.
[0032] Write formula (1) in the form of difference equation:
[0033]
[0034] In formula (2): T is the sampling period, k is ...
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The invention discloses a DC-DC power supply control method capable of avoiding system oscillation. The DC-DC power supply control method comprises the following steps: establishing a high-frequency DC-DC power supply PID control system comprising a proportional element, a differential element and an integral element. when the deviation between the actual output of the controlled system and a reference instruction is small, canceling the integral effect of the PID algorithm of the PID control system of the high-frequency DC-DC power supply, and setting the conditions that PID control and PD control are adopted for high-frequency DC-DC power supply control to obtain an integral separation PID control system of the high-frequency DC-DC power supply; introducing a dead zone into a high-frequency DC-DC power supply integral separation PID control system; and applying the obtained integral separation PID control algorithm with the dead zone to a high-frequency DC-DC power supply control system, so as to achieve the effect of avoiding system oscillation. According to the invention, an integral separation improved PID control algorithm is adopted, and high-frequency DC-DC power supply control of system oscillation is avoided.
Description
technical field [0001] The invention relates to a DC-DC power supply control method capable of avoiding system oscillations, in particular to an improved PID control algorithm using integral separation to avoid system oscillations and a high-frequency DC-DC power supply control method. Background technique [0002] Traditional PID control has better control effects on time-varying and nonlinear systems, especially for high-frequency power supply control systems. PID control combined with fuzzy control ideas, that is, fuzzy PID control, although fuzzy logic can be used to adjust the PID parameters in real time, so that the PID parameters can be adjusted according to the error and error change rate to adapt to the different control parameters of the system. However, although this method has a good control effect in theory, in practice, due to the uncertain model of the controlled object, the parameters after self-tuning cannot meet the actual needs. Therefore, it is rarely use...
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IPC IPC(8): H02M3/335H02M1/38
CPCH02M3/33569H02M1/38H02M1/0006H02M1/385
Inventor 杨沛豪柴琦王小辉寇水潮高峰黄鹏王羚宇贺婷孙梦瑶张立松赵俊博
Owner XIAN THERMAL POWER RES INST CO LTD