A method and apparatus for treating water head

Abstract

This invention discloses a water head processing method and apparatus. By employing multiple signal inputs, the security and reliability of the signal can be significantly improved. The improved discrimination method increases the number of input channels from the original three to five under the same conditions, greatly improving the reliability of the water head. The invention also adds processing for sudden changes in water head, thereby increasing the security of the water head signal. The principle is simple, the method is easy to understand, and it has strong feasibility.

Description

Technical Field

[0001] This invention relates to the field of hydropower plant technology, and in particular to a method and apparatus for treating water head. Background Technology

[0002] The governor is a crucial actuator in a hydropower plant, serving as the core of active power regulation. The head signal provides a vital reference for the governor's active power adjustment and is critical to its proper functioning. Currently, most hydropower plants employ traditional head processing methods, specifically: collecting upstream and downstream water level signals via a shared LCU, calculating the difference between these signals, and sending the head signal to the governor as an analog signal; another method involves calculating the head using multiple input signals to increase redundancy and ensure the reliability of the head signal. These methods also have the following problems:

[0003] When using only one water level acquisition loop to acquire water head, if there is a problem with the water level acquisition signal of that loop, it is impossible to switch, which directly affects the water head signal provided to the speed controller.

[0004] When using a multi-channel water level acquisition loop to collect head data, inconsistencies in the head signals from multiple channels may occur. How should this be handled? Head signals are typically generated from two channels: one upstream and one downstream. The LCU calculates the head signal based on these upstream and downstream levels. If there's a problem with the upstream water level of one signal and a problem with the downstream water level of the other, will it be impossible to calculate the head signal? These are current issues in head data processing. Summary of the Invention

[0005] The purpose of this invention is to provide a water head processing method and apparatus to solve the above-mentioned problems. This invention determines whether the quality of water level signal channels from the water information system and the public system is normal. When the channel quality is abnormal, it will automatically combine the water level signals through an algorithm and correctly calculate the water head signal.

[0006] The present invention achieves the above objectives through the following technical solutions:

[0007] A water head treatment device includes a first upstream water level sensor, a first downstream water level sensor, a second upstream water level sensor, a second downstream water level sensor, a common LCU controller, a water information system server, a plant-level server, a unit LCU controller, and a speed governor controller.

[0008] The first upstream water level sensor is installed upstream of the reservoir to collect the first water level signal upstream of the reservoir; the first downstream water level sensor is installed downstream of the reservoir to collect the first water level signal downstream of the reservoir.

[0009] The first upstream water level sensor and the first downstream water level sensor convert the collected water level signals into analog signals and input them into the common LCU controller; the common LCU controller calculates and converts the received water level signals into the upstream water level H of the reservoir. 公用1 and the upstream water level H of the reservoir 公用2 The plant-level server collects the upstream water level H of the reservoir from the public LCU controller via network communication. 公用1 and the downstream water level H of the reservoir 公用2 ;

[0010] The second upstream water level sensor is installed upstream of the reservoir to collect the second water level signal upstream of the reservoir; the second downstream water level sensor is installed downstream of the reservoir to collect the second water level signal downstream of the reservoir.

[0011] The second upstream water level sensor and the second downstream water level sensor convert the collected water level signals into analog signals and send them to the hydrological system server. The hydrological system server then calculates and converts the collected water level signals into the upstream water level H of the reservoir. 集控1 and the downstream water level H of the reservoir 集控2 The calculation results are then sent to the plant-level server via network communication.

[0012] The plant-level server is independently configured with a set of upstream reservoir water levels H. 人工1 and the downstream water level H of the reservoir 人工2 The water level is set via a human-computer interaction interface; the plant-level server transmits the upstream water level H of the reservoir via network communication. 公用1 and the upstream water level H of the reservoir 公用2 Upstream water level H of the reservoir 集控1 and the downstream water level H of the reservoir 集控2 Upstream water level H of the reservoir 人工1 and the downstream water level H of the reservoir 人工2 The signal is sent to the unit's LCU controller; the unit's LCU controller selects the final required head signal and sends it to the governor controller, which adjusts the unit's active power based on the obtained head signal.

[0013] In another aspect, the present invention provides a water head treatment method, comprising the following steps:

[0014] Step 1: Receive water level signal and channel quality;

[0015] Step 2: Determine the validity of the received water level signal;

[0016] Step 3: Determine if all water level signals from the centralized control and public systems are normal;

[0017] Step 4: Calculation and processing of head signals;

[0018] Step 5: If the head value is normal, the LCU control output head signal of the unit is sent to the governor control system through the AO analog signal channel to provide a reference for the governor power adjustment.

[0019] A further proposed solution is that, in step 1, the unit's LCU controller simultaneously receives the upstream reservoir water level H sent by the plant-level server. 公用UP Downstream water level H 公用DN Upstream water level H of the reservoir 集控UP Downstream water level H 集控DN Upstream water level H of the reservoir 人工UP Downstream water level H 人工DN The channel quality status corresponding to each water level signal; the channel quality status represents whether the analog signal channel of the original data acquisition is normal. If it is normal, it means that the actual value is a reliable value. If it is not normal, it means that the actual value is an unreliable value.

[0020] A further solution is that, in step 2, criterion 1: determine whether the 6-channel water level signal is valid, i.e.: H 给定DN ≤H 公用DN H 给定DN ≤H 集控DN H 给定DN ≤H 人工DN H 公用UP ≤H 给定UP H 集控UP ≤H 给定UP H 人工UP ≤H 给定UP ;wherein: H 给定DN H is the permissible lower limit of the downstream water level of the reservoir. 给定UP Criterion 2: Calculate ΔH (the upper limit of the allowed upstream water level of the reservoir); UP1 =|H 公用UP -H 集控UP |、△H UP2 =|H 公用UP -H 人工UP |、△H UP3 =|H 集控UP -H 人工UP |, at the same time, △H UP1 , △H UP2 , △H UP3 respectively with △H 给定UP Compare; that is: △H UP1 ≤△H 给定 , △H UP2 ≤△H 给定 , △H UP3 ≤△H 给定 , where: △H 给定Given a permissible error, the upstream water level signals from the three reservoirs are deemed valid if they fall within the permissible error range; similarly, ΔH is calculated. DN1 =|H 公用DN -H 集控DN |、△H DN2 =|H 公用DN -H 人工DN |、△H DN3 =|H 集控DN -H 人工DN |, where △H DN1 , △H DN2 , △H DN3 respectively with △H 给定 Compare; that is: △H DN1 ≤△H 给定 , △H UP2 ≤△H 给定 , △H UP3 ≤△H 给定 If the downstream water level signals of the three reservoirs are within the allowable error range, the values ​​are considered valid; Criterion 3: H 公用DN H 集控DN H 人工DN H 公用UP H 集控UP H 人工UP The quality status of each of the 6 water level signals is checked to see if it is normal. If it is normal, it means that there are no faults such as disconnection or data not being refreshed in the water level signal channel. If the above 3 criteria are met at the same time, the water level signal is confirmed to be valid and proceeds to step 3 for further processing. Otherwise, it is considered invalid and an alarm is triggered.

[0021] A further solution is that, in step 3, (H) 集控UP H 集控DN ), (H 公用UP H 公用DN ), (H 人工UP H 人工DN The reliable water level signals are temporarily stored in a variable array as reliable data. Based on the data in step 2, if all the centralized control water level signals in the first group are valid, they are used as the final signal for calculating the water head. If the first group of centralized control water level signals is abnormal, it will automatically determine whether all the second group of common water level signals are valid. If all the second group of common water level signals are valid, they will be used as the final signal for calculating the water head. If the above centralized control water level signals and common water level signals are not completely normal, it will automatically determine which signal in the first group of centralized control water level signals is abnormal and match it with the second group of common water level signals. When a water level signal cannot be matched, an alarm will be triggered and the operator will be prompted to determine the upstream and downstream water levels through manual settings.

[0022] A further proposed solution is that, in step 4, the head signal is calculated based on the judgment result of step 3. If all the centralized control water level signals in the first group in step 3 are normal, then Hg = H 集控UP -H 集控DN Hg represents the calculated head signal; based on the calculation cycle of the unit's LCU controller, the average value is calculated continuously over n cycles, i.e. in The mean head is used as the final head signal, where n is a natural number between 10 and 20, and the calculated head value Hg is used for each period. i+1 Compared with the calculated head value Hg of the previous cycle i For comparison, if the mutation exceeds 1 meter, that is: ΔH = |Hg i+1 -Hg i If △H≥1, discard the value and trigger an alarm. Recalculate the average value from the first cycle, while keeping the head value unchanged from the previous cycle.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention employs multiple signal inputs, which can significantly improve the security and reliability of the signal; the improved discrimination method increases the original three input channels to five under the same conditions, greatly improving the reliability of the water head; it adds processing for sudden changes in water head, increasing the security of the water head signal; the principle is simple, the method is easy to understand, and it has strong feasibility. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural diagram of the present invention.

[0027] Among them, 1. First upstream water level sensor, 2. First downstream water level sensor, 11. Second upstream water level sensor, 22. Second downstream water level sensor, 3. Common LCU controller, 4. Hydrological system server, 5. Plant-level server, 6. Unit LCU controller, 7. Governor controller.

[0028] Figure 2 This is a schematic diagram of the algorithm of the present invention.

[0029] Figure 3 This is a schematic diagram of an existing technology algorithm.

[0030] Figure 4 This is a flowchart of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0032] In any embodiment, such as Figure 1 As shown, a water head treatment device of the present invention includes a first upstream water level sensor 1, a first downstream water level sensor 2, a second upstream water level sensor 11, a second downstream water level sensor 22, a common LCU controller 3, a water information system server 4, a plant-level server 5, a unit LCU controller 6, and a speed governor controller 7.

[0033] The first upstream water level sensor 1 is installed upstream of the reservoir to collect the first water level signal upstream of the reservoir; the first downstream water level sensor 2 is installed downstream of the reservoir to collect the first water level signal downstream of the reservoir.

[0034] The first upstream water level sensor 1 and the first downstream water level sensor 2 convert the collected water level signals into analog signals and input them into the common LCU controller 3; the common LCU controller 3 calculates and converts the received water level signals into the upstream water level H of the reservoir. 公用1 and the upstream water level H of the reservoir 公用2 The plant-level server 5 collects the upstream water level H of the reservoir from the public LCU controller 3 via network communication. 公用1 and the downstream water level H of the reservoir 公用2 ;

[0035] The second upstream water level sensor 11 is installed upstream of the reservoir to collect the second water level signal upstream of the reservoir; the second downstream water level sensor 22 is installed downstream of the reservoir to collect the second water level signal downstream of the reservoir.

[0036] The second upstream water level sensor 11 and the second downstream water level sensor 22 convert the collected water level signals into analog signals and send them to the hydrological system server 4. The hydrological system server 4 then calculates and converts the collected water level signals into the upstream water level H of the reservoir. 集控1 and the downstream water level H of the reservoir 集控2 The calculation results are then sent to the plant-level server 5 via network communication.

[0037] The plant-level server 5 is independently configured with a set of upstream reservoir water level H.人工1 and the downstream water level H of the reservoir 人工2 The water level is set via a human-computer interaction interface; the plant-level server 5 transmits the upstream water level H of the reservoir via network communication. 公用1 and the upstream water level H of the reservoir 公用2 Upstream water level H of the reservoir 集控1 and the downstream water level H of the reservoir 集控2 Upstream water level H of the reservoir 人工1 and the downstream water level H of the reservoir 人工2 The signal is sent to the unit LCU controller 6; the unit LCU controller 6 selects the final required head signal and sends it to the speed governor controller 7; the speed governor controller 7 adjusts the active power of the unit according to the obtained head signal.

[0038] In one specific embodiment, such as Figure 1-4 As shown, a water head treatment method of the present invention, a novel water head treatment method, includes the following steps:

[0039] Step 1: Receive water level signal and channel quality; the unit's LCU controller simultaneously receives the upstream reservoir water level H sent by the plant-level server. 公用UP Downstream water level H 公用DN Upstream water level H of the reservoir 集控UP Downstream water level H 集控DN Upstream water level H of the reservoir 人工UP Downstream water level H 人工DN And the channel quality status corresponding to each water level signal; the channel quality status represents whether the analog signal channel of the raw data acquisition is normal. If it is normal, it means that the actual value is a reliable value. If it is not normal, it means that the actual value is an unreliable value.

[0040] Step 2: Determine the validity of the received water level signals; Criterion 1: Determine whether the 6-channel water level signals are valid, i.e.: H 给定DN ≤H 公用DN H 给定DN ≤H 集控DN H 给定DN ≤H 人工DN H 公用UP ≤H 给定UP H 集控UP ≤H 给定UP H 人工UP ≤H 给定UP 、; Explanation: H 给定DN H is the permissible lower limit of the downstream water level of the reservoir. 给定UP Criterion 2: Calculate ΔH (the upper limit of the allowed upstream water level of the reservoir); UP1 =|H 公用UP -H 集控UP |、△H UP2 =|H 公用UP -H人工UP |、△H UP3 =|H 集控UP -H 人工UP |, at the same time, △H UP1 , △H UP2 , △H UP3 respectively with △H 给定UP Compare; that is: △H UP1 ≤△H 给定 , △H UP2 ≤△H 给定 , △H UP3 ≤△H 给定 (Note: △H) 给定 Given the allowable error, the upstream water level signals of the three reservoirs are determined to be within the allowable error and therefore valid; similarly, ΔH is calculated. DN1 =|H 公用DN -H 集控DN |、△H DN2 =|H 公用DN -H 人工DN |、△H DN3 =|H 集控DN -H 人工DN |,(at the same time, △H DN1 , △H DN2 , △H DN3 respectively with △H 给定 Compare; that is: △H DN1 ≤△H 给定 , △H UP2 ≤△H 给定 , △H UP3 ≤△H 给定 If the downstream water level signals of the three reservoirs are within the allowable error range, the values ​​are considered valid; Criterion 3: H 公用DN H 集控DN H 人工DN H 公用UP H 集控UP H 人工UP Check if the channel quality status of each of the 6 water level signals is normal. If it is normal, it means that there are no faults such as disconnection or data not being refreshed in that water level signal channel. Only when the above 3 criteria are met at the same time can the water level signal be confirmed as valid. Proceed to step 3 to continue processing. Otherwise, it is an invalid value and an alarm is triggered.

[0041] Step 3: Determine if all water level signals from the centralized control and public systems are normal; respectively (H 集控UP H 集控DN ), (H 公用UP H 公用DN ), (H 人工UP H 人工DNThe reliable water level signals are temporarily stored in a variable array as reliable data. Based on the data in step 2, if all the first group of centralized control water level signals are valid, they are used as the final signal for calculating the head. If the first group of centralized control water level signals is abnormal, it will automatically determine whether all the second group of common water level signals are valid. If all the second group of common water level signals are valid, they will be used as the final signal for calculating the head. If the above centralized control water level signals and common water level signals are not completely normal, it will automatically determine which signal in the first group of centralized control water level signals is abnormal and match it with the second group of common water level signals. For example, it will determine the upstream water level signal H in the first group of centralized control water level signals. 集控UP Anomaly, downstream water level signal H 集控DN If normal, it will judge the upstream water level signal H shared by the second group. 公用UP Is it normal? If it is normal, then adjust the downstream water level H of the first centralized control system. 集控DN Shared upstream water level H with Group 2 公用UP The water level is matched to the final signal for calculating the water head; if the water level signal cannot be matched, an alarm will be triggered and the operator will be prompted to determine the upstream and downstream water levels through manual settings.

[0042] Step 4: Head Signal Calculation and Processing; Calculate the head signal based on the judgment results of Step 3. For example, if all the centralized control water level signals in the first group in Step 3 are normal, then Hg = H 集控UP -H 集控DN Hg represents the calculated head signal; based on the calculation cycle of the unit's LCU controller, the average value is calculated continuously over n cycles, i.e. in The mean head is used as the final head signal, and n is generally chosen to be a natural number between 10 and 20. To prevent sudden changes in the head signal during operation, the calculated head value Hg for each cycle is... i+1 Compared with the calculated head value Hg of the previous cycle i For comparison, if the mutation exceeds 1 meter, that is: ΔH = |Hg i+1 -Hg i If △H≥1, discard the value and trigger an alarm. Recalculate the average value from the first cycle, while keeping the head value unchanged from the previous cycle.

[0043] Step 5: If the head value is normal, the LCU control output head signal of the unit is sent to the governor control system through the AO analog signal channel to provide a reference for the governor power adjustment.

[0044] The differences between existing technologies and current processing methods are as follows: Figure 3 As shown.

[0045] Existing methods generate head signals through three different channels, resulting in three sets of signals. If the quality of the water level channel in one of these channels is faulty, that signal set is discarded. The selection of which water level signal to use is also manually switched, without automatic judgment. The current processing method still uses three different channels, but it assesses the quality of the water level signal channels from the hydrological system and public utilities. When channel quality is abnormal, an algorithm automatically combines the water level signals and correctly calculates the head signal. When both channels malfunction, manual intervention is prompted to ensure the head signal is normal. This algorithm adds a fault tolerance mechanism compared to the original, increasing the number of head signals from three to five, maximizing the reliability of the head signal, addressing the shortcomings of the original method, and ensuring a safer and more reliable head signal.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims. It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. Furthermore, various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the spirit of the present invention, they should also be considered as the content disclosed in the present invention.

Claims

1. A method for treating water head, characterized in that, The water head treatment device is used, which includes a first upstream water level sensor (1), a first downstream water level sensor (2), a second upstream water level sensor (11), a second downstream water level sensor (22), a common LCU controller (3), a water information system server (4), a plant-level server (5), a unit LCU controller (6), and a speed governor controller (7). The first upstream water level sensor (1) is installed upstream of the reservoir to collect the first water level signal upstream of the reservoir; the first downstream water level sensor (2) is installed downstream of the reservoir to collect the first water level signal downstream of the reservoir. The first upstream water level sensor (1) and the first downstream water level sensor (2) convert the collected water level signals into analog signals and input them into the common LCU controller (3); the common LCU controller (3) calculates and converts the received water level signals into the upstream water level H of the reservoir. 公用1 and the upstream water level H of the reservoir 公用2 The plant-level server (5) collects the upstream water level H of the reservoir from the public LCU controller (3) via network communication. 公用1 and the downstream water level H of the reservoir 公用2 ; The second upstream water level sensor (11) is installed upstream of the reservoir to collect the second water level signal upstream of the reservoir; the second downstream water level sensor (22) is installed downstream of the reservoir to collect the second water level signal downstream of the reservoir. The second upstream water level sensor (11) and the second downstream water level sensor (22) convert the collected water level signals into analog signals and send them to the hydrological system server (4). The hydrological system server (4) then calculates and converts the collected water level signals into the upstream water level H of the reservoir. 集控1 and the downstream water level H of the reservoir 集控2 And the calculation results are sent to the plant-level server via network communication (5); The plant-level server (5) is independently configured with a set of upstream water level H of the reservoir. 人工1 and the downstream water level H of the reservoir 人工2 The water level is set via a human-computer interaction interface; the plant-level server (5) transmits the upstream water level H of the reservoir via network communication. 公用1 and the upstream water level H of the reservoir 公用2 Upstream water level H of the reservoir 集控1 and the downstream water level H of the reservoir 集控2 Upstream water level H of the reservoir 人工1 and the downstream water level H of the reservoir 人工2 The head signal is sent to the unit LCU controller (6); the unit LCU controller (6) selects the final required head signal and sends it to the speed governor controller (7); the speed governor controller (7) adjusts the active power of the unit according to the obtained head signal. The method includes the following steps: Step 1: Receive water level signal and channel quality; In step 1, the unit's LCU controller simultaneously receives the upstream reservoir water level H sent by the plant-level server. 公用UP Downstream water level H 公用DN Upstream water level H of the reservoir 集控UP Downstream water level H 集控DN Upstream water level H of the reservoir 人工UP Downstream water level H 人工DN And the channel quality status corresponding to each water level signal; the channel quality status represents whether the analog signal channel of the raw data acquisition is normal. If it is normal, it means that the actual value is a reliable value. If it is not normal, it means that the actual value is an unreliable value. Step 2: Determine the validity of the received water level signal; In step 2, criterion 1 is to determine whether the six water level signals are valid, i.e., H. 给定DN ≤H 公用DN H 给定DN ≤H 集控DN H 给定DN ≤H 人工DN H 公用UP ≤H 给定UP H 集控UP ≤H 给定UP H 人工UP ≤H 给定UP ;wherein: H 给定DN H is the permissible lower limit of the downstream water level of the reservoir. 给定UP Criterion 2: Calculate ΔH (the upper limit of the allowed upstream water level of the reservoir); UP1 =|H 公用UP -H 集控UP |、△H UP2 =|H 公用UP -H 人工UP |、△H UP3 =|H 集控UP -H 人工UP |, at the same time, △H UP1 , △H UP2 , △H UP3 respectively with △H 给定UP Compare; that is: △H UP1 ≤△H 给定 , △H UP2 ≤△H 给定 , △H UP3 ≤△H 给定 , where: △H 给定 Given the allowable error, the upstream water level signals from the three reservoirs are deemed valid if they fall within the allowable error range; similarly, ΔH is calculated. DN1 =|H 公用DN -H 集控DN |、△H DN2 =|H 公用DN -H 人工DN |、△H DN3 =|H 集控DN -H 人工DN |, where △H DN1 , △H DN2 , △H DN3 respectively with △H 给定 Compare; that is: △H DN1 ≤△H 给定 , △H UP2 ≤△H 给定 , △H UP3 ≤△H 给定 If the downstream water level signals of the three reservoirs are within the allowable error range, the values ​​are considered valid; Criterion 3: H 公用DN H 集控DN H 人工DN H 公用UP H 集控UP H 人工UP The quality status of each of the 6 water level signals is checked to see if it is normal. If it is normal, it means that there are no faults such as disconnection or data not being refreshed in the water level signal channel. If the above 3 criteria are met at the same time, the water level signal is confirmed to be valid and proceeds to step 3 for further processing. Otherwise, it is considered invalid and an alarm is triggered. Step 3: Determine if all water level signals from the centralized control and public systems are normal; In step 3, (H) 集控UP H 集控DN ), (H 公用UP H 公用DN ), (H 人工UP H 人工DN The reliable water level signals are temporarily stored in a variable array as reliable data. Based on the data in step 2, if all the centralized control water level signals in the first group are valid, they are used as the final signal for calculating the water head. If the first group of centralized control water level signals is abnormal, it will automatically determine whether all the second group of common water level signals are valid. If all the common water level signals in the second group are valid, they will be used as the final signal for calculating the water head. If the above centralized control water level signals and common water level signals are not completely normal, it will automatically determine which signal in the first group of centralized control water level signals is abnormal and match it with the second group of common water level signals. When a water level signal cannot be matched, an alarm will be triggered and the operator will be prompted to determine the upstream and downstream water levels through manual settings. Step 4: Calculation and processing of water head signal; In step 4, the head signal is calculated based on the judgment result of step 3. If all the centralized control water level signals in the first group in step 3 are normal, then Hg = H 集控UP -H 集控DN Hg represents the calculated head signal; based on the calculation cycle of the unit's LCU controller, the average value is calculated continuously over n cycles, i.e. ,in The mean head is used as the final head signal, where n is a natural number between 10 and 20, and the calculated head value Hg is used for each period. i+1 Compared with the calculated head value Hg of the previous cycle i For comparison, if the mutation exceeds 1 meter, that is: ΔH = |Hg i+1 -Hg i If △H≥1, discard the value and trigger an alarm. Recalculate the average value from the first cycle, while keeping the head value unchanged from the previous cycle. Step 5: If the head value is normal, the LCU control output head signal of the unit is sent to the governor control system through the AO analog signal channel to provide a reference for the governor power adjustment.

Images