CN-116864170-B - Nuclear power plant high-low load different control strategy switching method

Abstract

The invention belongs to the technical field of instrument control systems of nuclear power plants, and particularly relates to a switching method of different control strategies of high and low loads of a nuclear power plant. The control method comprises the following steps of S1, obtaining a low-load control permission signal P=1 and a high-load control permission signal P1=0, obtaining a control rod automatic action signal C, S2, switching the low-load control mode to the high-load control mode, S3, obtaining a control rod automatic action signal C in the high-load control mode, S4, switching the high-load control mode to the low-load control mode, and S5, enabling the control rod to switch into the manual control mode, wherein the automatic control signals of a high-load control channel and a low-load control channel are invalid. The invention can realize the mutual stable switching of the automatic control signals of the reactor power control system under the working conditions of high and low load, ensure the economic operation of the nuclear power plant and improve the operation flexibility of the nuclear power plant.

Inventors

• ZHANG YING
• CAO RUI
• YOU KAI
• ZHAO MENGWEI
• CHEN KE
• HUANG KE
• YANG PENGCHENG
• PU XIAOFEI
• DUAN FENG
• CHEN GUANYU
• CHEN ZHI
• ZHANG RUI
• WANG HUAJIN
• CUI HUAIMING
• LI WENPING
• ZHOU JIXIANG
• LI YILIANG
• XIAO KAI

Assignees

• 中国核动力研究设计院

Dates

Publication Date

20260512

Application Date

20230512

Claims (4)

1. 1. The switching method for the different control strategies of the high and low loads of the nuclear power plant is characterized by comprising the following steps: s1, a low-load control mode is adopted to obtain a low-load control permission signal P=1 and a high-load control permission signal P1=0, and a control rod automatic action signal C is obtained; s2, switching the low-load control mode to the high-load control mode; s3, a high-load control mode is adopted to obtain an automatic control rod action signal C; s4, switching the high-load control mode to the low-load control mode; S5, the control rod is switched into a manual control mode, and automatic control signals of the high-load control channel and the low-load control channel are invalid; The low-load control mode is used for obtaining a low-load control permission signal P, and specifically, when the nuclear power plant is in low-load operation, the manual/automatic control rod mode is set to be an automatic mode, namely M1=1, the high-low-load control mode is used for selecting the low-load control mode, namely M2=1, the steam discharge valve state is unlocked, namely F V =1, the nuclear power measurement signal N is higher than the low-load operation limit N Lmin and lower than the low-load operation limit N Lmax , namely the nuclear power state signal N S1 =1, the values of the four signals are logically ANDed, the value of the low-load control permission signal P is P=1, and the high-load control permission signal P1=0; In the step S1, an automatic control rod action signal C is obtained, specifically, the low-load control permission signal P is transmitted to the signal selection unit 1, the automatic control channel signal C L under the low load is transmitted to the signal selection unit 1, and according to p=1, the signal selection unit 1 outputs the automatic control rod action signal C1 as follows: C1=C L ; The high load control permission signal P1 is transmitted to the signal selection unit 2, the automatic control channel signal C H is transmitted to the signal selection unit 2 under high load, and the signal selection unit 2 outputs a control rod automatic action signal c2=0 according to p1=0; the value of the control rod automatic action signal C is as follows: C=C1+C2= C L +0= C L ; The low load control mode is switched to the high load control mode, when the control rod automatic control signal C1=C L is in the low load automatic control mode, and the high load automatic control channel replicates the automatic control channel signal under the low load in real time, namely, C H =C L is not output.
2. 2. The method for switching between different control strategies for high and low loads in a nuclear power plant according to claim 1, wherein the high load control mode obtains a control rod automatic action signal C, and specifically comprises: When the core power measurement signal N gradually increases and reaches or exceeds the upper limit of the low load operation, the value of the core power upper limit state signal N S2 will become 1, i.e., N S2 =1, and N S1 =0, where p=0, and if the high load control mode is selected at this time, i.e., m2=0, the value of the high load control enable signal P1 is: P1=1; The high load control permission signal P1 is transmitted to the signal selection unit 2, the automatic control channel signal C H is transmitted to the signal selection unit 2 under high load, and according to p1=1, the signal selection unit 2 outputs a control rod automatic action signal C2 as follows: C2=C H ; the value of the control rod automatic action signal C is as follows: C=C1+C2= 0+ C H = C H 。
3. 3. The method for switching between different control strategies for high and low loads in a nuclear power plant according to claim 2, wherein the high load control mode is switched to the low load control mode, and when the high load automatic control mode is set, the control rod automatic control signal c2=c H , and the low load automatic control channel replicates the automatic control channel signal under high load in real time, namely C L =C H but does not output the signal.
4. 4. The method for switching different control strategies of high and low loads in a nuclear power plant according to claim 3, wherein the control rod switches in a manual control mode, automatic control signals of the high and low load control channels are all invalid, specifically, if any one of signals M1, M2 and F V 、N S1 is not 1, P=0, the value of P passing through logic non-rear is 1, if the nuclear power does not reach the upper limit of a low load control area, N S2 =0,N S2 passes through logic non-rear value is 1, P and N S2 , the output is 1 after logic AND, the control mode is not set in the high load control mode, and the automatic control signals of the high and low load control channels are all invalid.

Description

Nuclear power plant high-low load different control strategy switching method Technical Field The invention belongs to the technical field of instrument control systems of nuclear power plants, and particularly relates to a switching method of different control strategies of high and low loads of a nuclear power plant. Background In the prior art, the domestic pressurized water reactor power tracking control problem research is provided, a power tracking control method and a self-adaptive controller based on a self-adaptive control theory are provided for ensuring the safe operation of a reactor core aiming at the actual demand of the load tracking of the nuclear power plant, the control effect is verified through simulation, the nuclear reactor power control coordination strategy is discussed, and the published reports such as the nuclear reactor power control coordination strategy are provided by introducing the basis of the nuclear reactor power control theory. However, none of the above documents relates to the problem of switching control strategies under different conditions of high and low loads. With the development of nuclear power technology, in order to better control a nuclear power plant and improve economy, the characteristics of the nuclear power plant in different running states can be fully utilized, and different control strategies are adopted to realize automatic control of reactor power. However, when different automatic control strategies are adopted by the reactor power control system at different load levels, if a proper switching method is not adopted, load fluctuation of the nuclear power plant may occur in the switching process, and thus the risk of overlarge transient state or shutdown of the power plant may be caused. Disclosure of Invention The invention solves the technical problem of providing a switching method of different control strategies of high and low loads of a nuclear power plant, which can realize the mutual stable switching of automatic control signals of a reactor power control system under the working conditions of high and low loads, ensure the economic operation of the nuclear power plant and improve the operation flexibility of the nuclear power plant. The invention adopts the technical scheme that: A switching method for different control strategies of high and low loads of a nuclear power plant comprises the following steps: s1, a low-load control mode is adopted to obtain a low-load control permission signal P=1 and a high-load control permission signal P1=0, and a control rod automatic action signal C is obtained; s2, switching the low-load control mode to the high-load control mode; s3, a high-load control mode is adopted to obtain an automatic control rod action signal C; s4, switching the high-load control mode to the low-load control mode; s5, the control rod is switched into a manual control mode, and automatic control signals of the high-load control channel and the low-load control channel are invalid. The low load control mode is used for obtaining a low load control permission signal P, specifically, when the nuclear power plant is in low load operation, the manual/automatic control rod mode is set to be an automatic mode, namely M1=1, the high and low load control mode is used for selecting the low load control mode, namely M2=1, if the steam discharge valve state is unlocked, namely F V =1, the nuclear power measurement signal N is higher than the low limit N Lmin of the low load operation and lower than the high limit N Lmax of the low load operation, namely the nuclear power state signal N S1 =1, the values of the four signals are logically ANDed, the value of the low load control permission signal P is P=1, and the high load control permission signal P1=0. In the step S1, an automatic control rod action signal C is obtained, specifically, the low-load control permission signal P is transmitted to the signal selection unit 1, the automatic control channel signal C L under the low load is transmitted to the signal selection unit 1, and the signal selection unit 1 outputs the automatic control rod action signal C1 as follows according to P=1; C1=CL; The high load control permission signal P1 is transmitted to the signal selection unit 2, the automatic control channel signal C H is transmitted to the signal selection unit 2 under high load, and the signal selection unit 2 outputs a control rod automatic action signal c2=0 according to p1=0; the value of the control rod automatic action signal C is as follows: C=C1+C2=CL+0＝CL。 The low load control mode is switched to the high load control mode, when the control rod automatic control signal C1=C L is in the low load automatic control mode, and the high load automatic control channel replicates the automatic control channel signal under the low load in real time, namely, C H＝CL is not output. The high-load control mode, the automatic action signal C of the control rod is obtained, specifically compr