Engine rotation speed control method for power generation system
A technology of engine speed and control method, applied in engine control, machine/engine, governor, etc., can solve the problems of large spillover, unchanged control output, calculation error, etc., to achieve stable generator speed, The effect of stable engine speed and improved stability
Active Publication Date: 2018-11-06
TIANJIN JIEQIANG POWER EQUIP
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Problems solved by technology
At present, the application of PID algorithm in the control system generally has the following defects: 1. When using the positional PID algorithm, each output is related to the past state, and each controller output value needs to be recalculated, and the continuity of the controller output value is poor. , the computer calculation workload is large; 2. The use of incremental PID algorithm has problems such as large integral truncation effect, static error, and large impact of overflow.
In the process of realizing the present invention, the inventor further found that: in terms of using the PID algorithm to adjust the motor speed, under certain set speed values, the system is prone to overshoot phenomenon. When the actual speed and the set speed are small, due to the incremental The calculation error of the formula PID algorithm, the control output does not change, and the actual speed cannot reach the set speed
Method used
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[0034] Such as figure 2 As shown, a specific implementation of the method for controlling the engine speed of the power generation system disclosed in the present invention includes:
[0035] S202: Calculate the deviation amount: usually the difference between the set value and the controlled amount, that is, e(t)=r(t)-c(t);
[0036] S204: Determine whether [e(t)+e(t-1)] is greater than or equal to a;
[0037] S206: If [e(t)+e(t-1)]≥a,
[0038] Then Kp(t)=Kp×d×{[(e(t)+e(t-1))÷c]%256},
[0039] Proportion result=Kp(t)×[e(t)+e(t-1)];
[0040] S208: If [e(t)+e(t-1)]
[0041] Proportion result=Kp(t)×[e(t)+e(t-1)];
[0042] S210: Judge whether e(t) is greater than or equal to a;
[0043] S212: If e(t)≥a, then Ki(t)=Ki, integration result=Ki(t)×e(t);
[0044] S214: If e(t)
[0045] S216: Determine whether [e(t)-2×e(t-2)+e(t-1)] is greater than or equal to a;
[0046] S218: If [e(t)-2×e(t-2)+e(t-1)]
[0047] Kd(t...
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The invention provides an engine rotation speed control method for a power generation system and relates to the technical field of automatic control. The engine rotation speed control method comprisesthe steps of receiving a set rotation speed signal of an upper computer; outputting a first control signal to a torque motor for adjusting an engine throttle according to the set rotation speed so that the rotation speed of an engine can be changed, specifically, the engine is used for driving a power generation assembly; continuously obtaining real-time rotation speed data of the engine; and outputting a second control signal through a variable coefficient incremental PID algorithm according to the real-time rotation speed data to continuously adjust the rotation speed of the engine, specifically, as for the variable coefficient incremental PID algorithm, constant coefficients Kp, Ki and Kd in the incremental PID algorithm are set as constant coefficients Kp(t), Ki(t) and Kd(t) correspondingly for PID calculation based on the incremental PID algorithm. By means of the engine rotation speed control method for the power generation system, the stability of the rotation speed of the engine can be effectively improved, and the quality of output power energy of a power generator is ensured.
Description
Technical field [0001] The invention relates to the technical field of automatic control, and in particular to a method for controlling the engine speed of a power generation system. Background technique [0002] PID algorithm is currently the most widely used control algorithm in the industrial field. It has the advantages of simple principle, easy implementation, wide application, independent control parameter items, and relatively simple parameter selection. PID control (proportional-integral-derivative control) uses the input parameter information and configuration information to perform PID calculations. According to the expected value (Expect), current value (Current) and the proportional coefficient (Kp), integral coefficient (Ki), and differential coefficient (Kd) of the PID, perform the latest N sampling calculations and corrections, and finally output the result to the execution unit. The goal is to make the result close to the expected value (Expect). Usually based ...
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Login to View More IPC IPC(8): F02D29/06F02D11/10
CPCF02D11/10F02D29/06F02D31/002F02D2200/101
Inventor 芮春伶李成铭
Owner TIANJIN JIEQIANG POWER EQUIP