CN112129537B - Fixed power mode steam turbine set valve flow characteristic test method - Google Patents
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Abstract
A fixed power mode steam turbine set valve regulation flow characteristic test method is characterized in that a coordination mode is put into a CCS coordination control system of a unit set, and an AGC automatic generation control function and a primary frequency modulation function on two sides of a CSS/DEH are withdrawn; maintaining the load of the unit unchanged, continuously increasing the set offset of the main steam pressure at a certain speed, and continuously decreasing the opening of the regulating valve along with the continuous increase of the main steam pressure; and synchronously recording and collecting related thermal parameters under different load test working conditions, normalizing and correcting original data and performing related calculation to obtain the throttle flow characteristic of the steam turbine set, and further performing setting or verification work of a steam distribution function of a DEH system of the steam turbine set. According to the invention, through transverse comparison among different loads or repeated test of the same load, the system error and random error in the test process are effectively reduced, and the test efficiency and test quality are obviously improved. The method can be applied to the off-line setting or verification of the DEH system steam distribution function and can also be applied to the on-line verification of the DEH system steam distribution function.
Description
Technical Field
The invention relates to a method for testing the flow characteristic of a throttle of a fixed-power mode steam turbine unit, and belongs to the technical field of running of steam turbine units.
Background
Modern steam turbine units have widely adopted a Digital Electro-Hydraulic Control System (DEH) to implement the management of a gate valve sequence. The valve flow characteristic refers to the numerical value corresponding relation between the steam inlet flow and the valve opening under the established steam distribution structure and valve sequence mode when the steam turbine set operates in variable load and fixed parameters. In operation, the flow characteristic of the regulating valve is the external expression of the steam distribution mode of the steam turbine set; the DEH system steam distribution function follows the inherent flow characteristic of the unit to realize the linear accurate regulation of the steam inlet flow. The steam turbine flow characteristic test is an effective means for accurately setting or verifying the DEH steam distribution function of the steam turbine on site. For a quick-opening regulating valve, the flow characteristic has a nonlinear characteristic. In the test process, whether a sufficient representative sample can be collected and the characteristic can be accurately reflected is one of the keys for setting the accuracy of the steam distribution function of the DEH system.
In the conventional test, under a certain condition of initial parameters and a valve sequence of a valve, main steam pressure is kept unchanged, related test parameters within a range from 100% of a maximum total valve instruction to a minimum total valve instruction are discretely measured at intervals of a certain test valve (a total valve instruction or a valve opening) (in the process, the load of a unit is gradually reduced along with the reduction of the total valve instruction), and a DEH steam distribution function is set according to the related test parameters. Practice shows that the conventional test has the following defects: firstly, the setting of the test valve positions is distributed discretely, and large human factors exist, so that the nonlinear characteristic information of the governing flow characteristic is difficult to accurately grasp. Secondly, the test requires to quit the coordination mode of a CCS (coordinated Control System) coordination Control system, and the combustion adjustment and the grinding set shutdown are both completed in a manual mode, so that the test method is greatly different from a normal operation mode and an operation habit; therefore, the steam-water parameters are difficult to avoid large fluctuation, and certain interference is generated on the test quality. Thirdly, a part of the units are limited by the DEH system function, the total valve position instruction needs to be manually assigned, and the safety risk of non-stop of the units caused by misoperation exists; meanwhile, in order to increase the number of test samples, the number of manual assignments on site is usually up to 300-400 (if the total valve position command interval is 0.1%). The working strength is high, and the flow regulating capacity of the regulating valve is weak and the valve position is rapidly changed in the pre-starting stage and the idle stroke stage of the regulating valve; the manual assignment cannot keep up with the change of the system state, and the stable control of steam-water parameters and the continuous sampling of the opening of the valve cannot be guaranteed. Fourthly, the load reduction range of the unit in the test process is large (for example, the difference between the highest load and the lowest load is about 250MW) and the test period is long, so that the test process is complex and is not suitable for arranging multiple tests on site; systematic errors and random errors of the experiment can not be effectively eliminated by repeated tests. Therefore, the conventional test method is difficult to effectively capture and collect a sufficient number of representative test samples, and a great deal of uncertainty is brought to later-stage adjusting of the throttle flow characteristic and setting of the overlapping degree, so that the test efficiency is low and the quality is poor.
In operation, when a coordination mode is put into operation under a certain fixed load, the main steam pressure of the steam turbine set can be continuously increased at a certain speed by setting pressure offset, and the opening degree of the regulating valve is necessarily slowly and continuously decreased. In the process, the valve positions of the regulating valve are densely and continuously distributed, so that the method is very suitable for collecting enough representative test samples and fully reflects the nonlinear characteristic of the flow characteristic of the quick-opening regulating valve; meanwhile, the system depends on automatic coordination control and is more in line with the operation habit; in addition, as for the test conditions, the load of the unit is more loose compared with the load of the unit which is greatly changed, and the test can be repeatedly carried out on site, so that the test system error and the random error can be reduced. In practice, it should be noted that this procedure differs from conventional testing in two ways: firstly, the conventional test is a process that the load of a unit is reduced along with the reduction of a main valve position instruction under the condition that the main steam pressure is unchanged; in the process, the load of the unit is kept unchanged, and the total valve position command is decreased progressively along with the increase of the main steam pressure. After simulation verification and field comparison verification, the difference can be eliminated by normalization correction of the original data. Secondly, the conventional test completes the test from the 100 percent total valve position instruction to the test minimum total valve position instruction at one time; the fixed load process is limited by a feasible sliding pressure interval corresponding to a certain fixed load, and a corresponding feasible valve position interval is limited, so that only a part of total valve position instruction area can be tested; therefore, a plurality of load points with different sizes are required to be set, so that the feasible valve position intervals under different loads are properly overlapped; and then, by connecting a plurality of test data under different loads in series, the complete nonlinear characteristic information of the flow characteristic of the steam turbine set is drawn.
Disclosure of Invention
The invention aims to provide a method for testing the flow characteristic of a throttle valve of a fixed-power mode steam turbine set, aiming at the defects of small sample number, large testing error, high safety risk and the like in a conventional flow characteristic test.
The technical scheme of the invention is that the method for testing the valve regulation flow characteristic of the fixed power mode steam turbine set comprises the steps of putting a coordination mode into a CCS (central control system) coordination control system of the unit set, and quitting an AGC (automatic Generation control) automatic power Generation control function and a primary frequency modulation function at both sides of CCS/DEH; keeping the load of the unit unchanged, continuously increasing the set offset of the main steam pressure at the speed of 0.1MPa/min, and continuously decreasing the opening of the regulating valve along with the continuous increase of the main steam pressure; and synchronously recording and acquiring related thermal parameters under different load test working conditions according to the frequency of 1 time/second, obtaining the governing valve flow characteristic of the steam turbine set through normalization correction and related calculation of original data, and further carrying out setting or verification work of a steam distribution function of a DEH (dead reckoning) system of the steam turbine set.
The invention relates to a method for testing the flow characteristic of a throttle of a fixed-power mode steam turbine set, which comprises the following steps:
(1) according to the manufacturer's specification and the actual site, three different load test conditions of high, medium and low are selected.
(2) Early-stage test preparation: before the test, according to the test purpose, the overlapping degree of the adjusting door is removed or put into; and (3) putting a coordination mode into the CCS coordination control system of the unit set, and quitting the AGC automatic generation control function and the primary frequency modulation function at the two sides of the CCS/DEH. After the unit load is increased to a target value, keeping the unit load unchanged; reducing the set offset of the main steam pressure to reduce the main steam pressure to the lower limit value of the feasible sliding pressure interval under the working condition of the load test; the total valve position instruction at the moment corresponds to the upper limit value of the feasible valve position interval under the working condition of the load test, and the upper limit value is used as the initial test state;
(3) and (3) formal test stage: under each load test working condition, respectively maintaining the load of the unit unchanged, continuously increasing the set offset of the main steam pressure at a certain speed from the beginning of the lower limit value of the feasible sliding pressure interval of the working condition, and continuously decreasing the opening of the regulating valve along with the continuous increase of the main steam pressure until the main steam pressure reaches the upper limit value of the feasible sliding pressure interval of the working condition; the total valve position instruction at the moment corresponds to the lower limit value of the feasible valve position interval under the working condition of the load test;
(4) synchronously recording and collecting related thermal parameters under each load test working condition;
(5) normalization and correction of original data: taking the designed main steam pressure and the designed main steam temperature as reference standards, and carrying out normalization correction on the original data; respectively multiplying the test regulating stage pressure and the test high-pressure cylinder exhaust steam pressure at each recording point under each load test working condition by the ratio of the designed main steam pressure to the test main steam pressure to obtain the normalized regulating stage pressure and the normalized high-pressure cylinder exhaust steam pressure; considering that the regulation stage efficiency and the high-pressure cylinder efficiency under the same total valve position are kept unchanged before and after data normalization correction, and respectively obtaining the normalization regulation stage temperature and the normalization high-pressure cylinder exhaust temperature through iterative calculation; calling a water and steam thermal property function according to the normalized pressure and temperature parameters to obtain a corresponding normalized regulating specific volume and a normalized high-pressure cylinder exhaust specific volume;
(6) calculating the flow characteristic of the steam turbine: for the unit selection formula (a) with the regulation level temperature measuring point and for the unit selection formula (b) without the regulation level temperature measuring point, the flow factor of each load test working condition at each moment point is calculated in sequence:
in the formula, the pressure of the stage is regulated in a normalization way; the exhaust pressure of the high-pressure cylinder is normalized; adjusting the specific volume to unity; the specific volume of the exhausted steam of the high-pressure cylinder is normalized;
(7) taking the corresponding flow factor when all the valves are fully opened under the high-load test working condition as a per unit value, and dividing the flow factor under each recording point under each load test working condition by the flow factor to obtain the actual flow percentage under the corresponding total valve position instruction; and (4) arranging and collecting the total valve position instruction, the valve opening and the actual flow percentage of each load test working condition to obtain the valve flow characteristic of the test unit.
The three different load test working conditions of high, medium and low are selected according to the following principle: firstly, determining a feasible valve position interval of a total valve position instruction under each load test working condition according to a feasible sliding pressure interval of main steam pressure under each load test working condition, namely an upper limit value and a lower limit value of the total valve position instruction; the upper limit value of the total valve position instruction under the high-load test working condition is 100%, and the upper limit value corresponds to the full-open state of all the valves. The lower limit value of the total valve position instruction under the low-load test working condition is 2-5% smaller than the minimum total valve position instruction of the test unit in the actual peak regulation operation process; meanwhile, after the feasible valve position intervals under the high load test working condition, the middle load test working condition and the low load test working condition are connected in series, the lower limit of the feasible valve position interval under the high load test working condition and the upper limit of the feasible valve position interval under the low load test working condition can be overlapped by 2% -5%, and the feasible valve position intervals of the two can cover the feasible valve position interval under the middle load test working condition.
When the purpose of the test is to set the steam distribution function of the DEH system, the overlapping degree of the throttle valve is removed before the test; when the purpose of the test is to verify the DEH system steam distribution function, the degree of turnstile overlap should be entered before the test.
Because the feasible valve position intervals under the high, medium and low different load test working conditions are preset with necessary overlapping, the nonlinear characteristic information of the throttle flow characteristic can be accurately grasped through transverse comparison among different loads or repeated test of the same load in the throttle pre-starting stage and the idle stroke stage in a targeted manner, so that the system error and the random error in the throttle flow characteristic test process are effectively reduced.
The method can be applied to offline setting or verification of the steam distribution function of the DEH system, and can also be applied to online verification of the steam distribution function of the DEH system.
The method has the advantages that the flow characteristic of the regulating valve of the steam turbine set is obtained by means of a coordination mode of a unit set coordination control system and a constant-power variable-pressure variable-valve position mode; a coordinated automatic control mode is adopted in the test process, so that the operation habit is met, and the misoperation safety risk is reduced; the total valve position instructions or the valve positions of the regulating valves are densely and continuously distributed, representative test samples are rich, and the nonlinear characteristics of the flow characteristics of the quick-opening regulating valves can be fully reflected; meanwhile, the system error and the random error in the testing process can be effectively reduced through transverse comparison among different loads or repeated testing of the same load, and the testing efficiency and the testing quality are remarkably improved.
Drawings
FIG. 1 is a flow characteristic curve of the testing unit of the present embodiment;
FIG. 2 is a steam distribution curve of the test unit in the embodiment under 600MW working conditions;
FIG. 3 is a steam distribution curve of the test unit in this embodiment under 480MW working condition;
fig. 4 is a steam distribution curve of the test unit in the embodiment under 360MW working conditions.
Detailed Description
The detailed description of the invention is shown in the drawings. The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to fig. 1 to 4 in the embodiment of the present invention.
The unit of the embodiment is an ultra-supercritical 660 MW-grade steam turbine unit, and in a sequence valve mode, a sequence of opening and closing valves is GV2/4 (synchronous) → CV3 → CV 1.
The method for testing the flow characteristic of the throttle valve of the fixed-power mode steam turbine set comprises the following steps:
(1) according to the manufacturer specifications and the field reality, the working conditions of high, medium and low loads such as 90 percent of nameplate power, 70 percent of nameplate power and 50 percent of nameplate power are selected as the test working conditions; determining a corresponding feasible valve position interval according to the feasible sliding pressure interval of each load test working condition; ensuring that the feasible valve position intervals of the load test working conditions after the serial connection and the convergence cover the actual variation range of the peak shaving operation of the test unit; meanwhile, the lower limit of the feasible valve position interval under the high-load working condition and the upper limit of the feasible valve position interval under the low-load working condition overlap by more than 2%, and the feasible valve position intervals of the two should cover the feasible valve position interval under the medium-load working condition. The high, medium and low load test working conditions of the case unit are respectively 600MW working condition, 480MW working condition and 360MW working condition.
(2) Early-stage test preparation: the purpose of the test of the embodiment is to set the steam distribution function of the DEH system, so that the degree of overlapping of the regulating gates is solved under the condition of the preset opening sequence of the regulating gates of the steam turbine. Before the test, a coordination mode is put into the CCS coordination control system of the unit set, and the AGC automatic generation control function and the primary frequency modulation function at the two sides of the CCS/DEH are quitted. The load of the unit is increased to a target value and kept unchanged, the main steam pressure is reduced to the lower limit value of the feasible sliding pressure interval of each load test working condition by reducing the set offset of the main steam pressure, and the total valve position instruction upper limit of the feasible valve position interval under the corresponding working condition is obtained;
(3) and (3) formal test stage: under each load test working condition, respectively maintaining the load of the unit unchanged, starting from the lower limit value of the feasible sliding pressure interval of the working condition, continuously increasing the set bias of the main steam pressure at the speed of 0.1MPa/min, and making the opening of the regulating valve continuously decrease along with the unidirectional continuous increase of the main steam pressure until the main steam pressure reaches the upper limit of the feasible sliding pressure interval of the working condition and corresponds to the lower limit of the feasible valve position interval of the working condition;
(4) respectively collecting related thermal parameters of all test working conditions at each moment point according to the frequency of 1 time/second;
(5) normalization and correction of original data: firstly, to design the main steam pressure P0And design main steam temperature T0Performing normalization correction on the original data as a reference standard; respectively multiplying the test regulation stage pressure and the test high-pressure cylinder exhaust pressure at each moment point under each load test working condition by the ratio of the designed main steam pressure to the test main steam pressure to obtain the normalized regulation stage pressure P1And normalized high pressure cylinder exhaust pressure P2(ii) a Meanwhile, the regulating stage efficiency and the high-pressure cylinder efficiency under the same total valve position are considered to be kept unchanged before and after data normalization correction, and the normalization regulating stage temperature T is obtained through iterative calculation1And-normalized high pressure cylinder exhaust temperature T2(ii) a And calling a water and steam thermodynamic property function according to the normalized pressure and temperature parameters to obtainCorresponding normalized regulated specific volume v1And-normalized high-pressure cylinder exhaust specific volume v2。
(6) Calculating the flow characteristic of the steam turbine: for the unit selection formula (a) with the regulation level temperature measuring point and for the unit selection formula (b) without the regulation level temperature measuring point, the flow factor Y of each load test working condition at each moment point is calculated in sequence:
(7) taking the corresponding flow factor when all the valves are fully opened under the high-load working condition as a per unit value, and dividing the flow factor under each load test working condition at each moment point by the flow factor to obtain the actual flow percentage under each total valve position instruction under each load test working condition; and (4) arranging and collecting the total valve position instruction, the valve opening and the actual flow percentage of each load test working condition to obtain the valve flow characteristic of the test unit. FIG. 1 is a flow characteristic curve of the testing unit of the present embodiment; FIG. 2 is a 600MW operating condition steam distribution curve of the testing unit in the embodiment; FIG. 3 is a steam distribution curve of the test unit in this embodiment under 480MW working condition; fig. 4 is a steam distribution curve of the test unit in the embodiment under 360MW working conditions.
Because the feasible valve position intervals under the high, medium and low different load test working conditions are preset with necessary overlapping, the nonlinear characteristic information of the throttle flow characteristic can be accurately grasped through transverse comparison among different loads or repeated test of the same load in the throttle pre-starting stage and the idle stroke stage in a targeted manner, so that the system error and the random error in the throttle flow characteristic test process are effectively reduced. Taking the example unit as an example, fig. 3 (corresponding to 480MW operating condition) and fig. 4 (corresponding to 360MW operating condition) both include the flow characteristics of CV3 at the idle stroke stage; the two trends are consistent, and the repeatability is better (the flow characteristics of CV3 under 480MW condition and 360MW condition can be plotted in the same graph). Thus, through lateral comparisons between different loads, it can be assumed that the test accurately obtains nonlinear information for the empty stroke stage of CV 3. Both FIG. 2 (for 600MW condition) and FIG. 3 (for 480MW condition) contain the flow characteristics of CV1 during the pre-start phase; the trend and the inflection point of the two are approximately consistent, and the repeatability is better (the flow characteristics of the CV1 under the 600MW working condition and the 480MW working condition can be plotted in the same graph). Thus, through the lateral comparison between different loads, it can be considered that the test accurately obtains the nonlinear information of the CV1 pre-starting stage.
The method for testing the flow characteristic of the throttle valve of the fixed-power mode steam turbine set provided by the invention is described in detail, a specific example is applied in the embodiment to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (4)
1. A constant-power mode steam turbine set throttle flow characteristic test method is characterized in that a coordination mode is put into a CCS coordination control system of a unit set, and an AGC automatic generation control function and primary frequency modulation functions on both sides of CCS/DEH are quitted; maintaining the load of the unit unchanged, continuously increasing the set offset of the main steam pressure at a certain speed, and continuously decreasing the opening of the regulating valve along with the continuous increase of the main steam pressure; synchronously recording and collecting related thermal parameters under different load test working conditions, obtaining the throttle flow characteristic of the steam turbine set through normalization correction and related calculation of original data, and further carrying out setting or verification work of a steam distribution function of a DEH system of the steam turbine set;
the method comprises the following steps:
(1) selecting three different load test working conditions of high, medium and low according to a manufacturer specification and field practice;
(2) early-stage test preparation: before the test, according to the test purpose, the overlapping degree of the adjusting valve is removed or put into; a coordination mode is put into the CCS coordination control system of the unit set, and an AGC automatic generation control function and a primary frequency modulation function at two sides of CCS/DEH are quitted; after the unit load is increased to a target value, keeping the unit load unchanged; reducing the set offset of the main steam pressure to reduce the main steam pressure to the lower limit value of the feasible sliding pressure interval under the working condition of the load test; the total valve position instruction at the moment corresponds to the upper limit value of the feasible valve position interval under the working condition of the load test, and the upper limit value is used as the test starting state;
(3) and (3) formal test stage: under each load test working condition, respectively maintaining the load of the unit unchanged, continuously increasing the set offset of the main steam pressure at a certain speed from the beginning of the lower limit value of the feasible sliding pressure interval of the working condition, and continuously decreasing the opening of the regulating valve along with the continuous increase of the main steam pressure until the main steam pressure reaches the upper limit value of the feasible sliding pressure interval of the working condition; the total valve position instruction at the moment corresponds to the lower limit value of the feasible valve position interval under the working condition of the load test;
(4) synchronously recording and collecting related thermal parameters under each load test working condition;
(5) normalization and correction of original data: to design the main steam pressure
And designing the temperature of the main steam
Performing normalization correction on the original data as a reference; respectively multiplying the test regulating stage pressure and the test high-pressure cylinder exhaust pressure at each recording point under each load test working condition by the ratio of the designed main steam pressure to the test main steam pressure to obtain the normalized regulating stage pressure
And normalized high pressure cylinder exhaust pressure
(ii) a Regulating stage effect under the same general valve positionThe rate and the high-pressure cylinder efficiency are kept unchanged before and after data normalization correction, and the normalization regulating stage temperature is respectively obtained through iterative calculation
And normalized high pressure cylinder exhaust temperature
(ii) a Calling the thermal property function of water and water vapor according to the normalized pressure and temperature parameters to obtain the corresponding normalized regulated specific volume
And normalized specific volume of exhaust steam of high-pressure cylinder
；
(6) Calculating the flow characteristic of the steam turbine: for the unit selection formula (a) with the regulation level temperature measuring points and the unit selection formula (b) without the regulation level temperature measuring points, the flow factor of each load test working condition at each moment point is calculated in turn
：
In the formula (I), the compound is shown in the specification,
regulating the stage pressure to unity;
the exhaust pressure of the high-pressure cylinder is normalized;
regulating the specific volume for normalization;
the specific volume of the exhausted steam of the high-pressure cylinder is normalized;
(7) taking the corresponding flow factor when all the valves are fully opened under the high-load test working condition as a per unit value, and dividing the flow factor under each recording point under each load test working condition by the flow factor to obtain the actual flow percentage under the corresponding total valve position instruction; and (4) arranging and collecting the total valve position instruction, the valve opening and the actual flow percentage of each load test working condition to obtain the valve flow characteristic of the test unit.
2. The method for testing the flow characteristic of the throttle valve of the steam turbine set in the constant power mode according to claim 1, wherein three different load test working conditions of high load, medium load and low load are selected according to the following principles: firstly, determining a feasible valve position interval of a total valve position instruction under each load test working condition according to a feasible sliding pressure interval of main steam pressure under each load test working condition, namely an upper limit value and a lower limit value of the total valve position instruction; the upper limit value of the total valve position instruction under the working condition of the high-load test is 100 percent, and the upper limit value corresponds to the full-open state of all the valves; the lower limit value of the total valve position instruction under the working condition of the low-load test is 2% -5% smaller than the minimum total valve position instruction of the test unit in the actual peak regulation operation process; meanwhile, after the feasible valve position intervals under the high-load test working condition, the middle-load test working condition and the low-load test working condition are connected in series, the lower limit of the feasible valve position interval under the high-load test working condition and the upper limit of the feasible valve position interval under the low-load test working condition can be overlapped by 2% -5%, and the feasible valve position intervals of the two can cover the feasible valve position interval under the middle-load test working condition.
3. The method for testing the flow characteristic of the throttle of the fixed-power mode steam turbine unit as claimed in claim 1, wherein the degree of the overlap of the throttle is released or put into practice, and when the purpose of the test is to set the steam distribution function of the DEH system, the degree of the overlap of the throttle is released before the test; when the purpose of the test is to verify the DEH system steam distribution function, the degree of turnstile overlap should be entered before the test.
4. The method for testing the flow characteristic of the throttle of the fixed-power-mode steam turbine unit as claimed in claim 1, wherein the feasible valve position intervals under the test working conditions of the high load, the medium load and the low load are preset with necessary overlapping, so that the nonlinear characteristic information of the flow characteristic of the throttle is accurately grasped in the pre-starting stage and the idle stroke stage of the throttle in a targeted manner through transverse comparison among different loads or repeated tests of the same load, and the systematic error and the random error in the test process of the flow characteristic of the throttle are effectively reduced.
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| CN114810227B (en) * | 2022-03-09 | 2023-10-03 | 贵州电网有限责任公司 | Method for measuring turbine body parameters based on closed loop mode |
| CN115495939B (en) * | 2022-11-17 | 2023-03-28 | 国网江西省电力有限公司电力科学研究院 | Steam turbine set throttle flow characteristic diagnosis method based on equivalent flow difference amplitude |
| CN116500898B (en) * | 2023-05-11 | 2024-03-19 | 华电国际电力股份有限公司莱城发电厂 | Thermal power generating unit AGC load control system based on characteristic flow identification |
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| JP2006009732A (en) * | 2004-06-28 | 2006-01-12 | Toshiba Corp | Turbine controller and method of correcting valve opening command to turbine controller |
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