Anti-integral saturation method for cascade control system

A control method, cascade control technology, applied to electric controllers, controllers with specific characteristics, etc., can solve problems such as system imbalance, and achieve the effect of avoiding integral saturation and rapid adjustment

Inactive Publication Date: 2021-07-13
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

[0011] It can be seen from the above that most DCS systems adopt the method of locking the main regulator when the sub-regulator is limited to resist integral saturation, and do not take correspondin

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  • Anti-integral saturation method for cascade control system
  • Anti-integral saturation method for cascade control system
  • Anti-integral saturation method for cascade control system

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[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0034] Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art wi...

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Abstract

The invention discloses an anti-integral saturation method for a cascade control system. The method comprises the steps: an auxiliary regulator PID2 is in a tracking state when the output of the auxiliary regulator PID2 reaches a limit value, and the output of the auxiliary regulator PID2 is locked; when the input deviation of the auxiliary regulator PID2 is reversed, the locking of the output of the auxiliary regulator PID2 is canceled; the locking condition of a main regulator PID1 is modified. When the output of the auxiliary regulator PID2 reaches a limit value, an RS trigger is set, and the output of the main regulator PID1 is locked in a one-way manner, so that the output of the main regulator PID1 is always locked when the output of the auxiliary regulator PID2 shakes and changes; and when the input deviation of the auxiliary regulator PID2 is reverse, the RS trigger is reset, and the blocking signal of the main regulator PID1 is cancelled. Aiming at the integral saturation problem of the cascade control system, the integral saturation of the main regulator PID1 of the cascade control system can be effectively avoided by considering the aspects of changing the tracking mode of the auxiliary regulator PID2, modifying the locking condition of the main regulator PID1 and the like, and the rapid regulation of the main regulator PID2 can be ensured.

Description

technical field [0001] The invention belongs to the technical field of automatic control of thermal power plants, and relates to a cascade control system anti-integral saturation control method. Background technique [0002] Cascade control is often adopted in the control of generator set separator superheat, steam drum water level, steam temperature, deaerator water level and fuel volume. This method can well eliminate the delay and inertia of the controlled object, but integral saturation will occur Phenomenon. If the integral saturation of the cascade control system cannot be eliminated in time, it will lead to system imbalance and even endanger the safety of the unit. [0003] When the integral saturation phenomenon occurs in the cascade control system, the system has a unidirectional deviation, and the output of the PID controller increases due to the continuous accumulation of the integral effect, so that u(t) reaches the limit value. At this time, even if the PID con...

Claims

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Application Information

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IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 王邦行赵志丹曲广浩张涵超王峥张瑞祥张海龙刘孝国周昭亮刘欢文怀周张靖
Owner XIAN THERMAL POWER RES INST CO LTD
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