Technical improvement of coordinated control system 1. Improvement of the pre-coordination control system commissioning situation The Huaneng Shantou Power Plant stove-furnace coordination control system had been restored to the original design configuration circuit before May 1998, and completed the automatic test of the verification system design function, but at the time CCS The automatic input of less than 85%, the main adjustment system such as steam temperature, water supply, negative pressure, deaerator water level are not ideal, not fully meet the requirements of the regulations. The load fluctuation test of the coordinated control system of the gas turbine can only pass the small-load, slow-speed small disturbance test (disturbance range 5MW, change rate 5MW/min), and the unit coordinated control can not be put into operation. 2. Technical improvement of load command feed-forward loop 2.1 The improved principle The original design of the unit coordination under the CCBF, CCTF, TF2 mode, the boiler fuel feed forward only LDC load instructions, the unit cast CCBF, CCTF coordination mode, due to the pure time of milling and boiler combustion pure delay When the load changes, the amount of fuel, steam temperature, and steam pressure fluctuate greatly. When the load changes greatly, it cannot be adjusted normally. Load instruction feed-forward loop technical improvement program: (1) increase fuel quantity plus inertia - unit power negative deviation feed forward, with partial reversal control excessive fluctuation of fuel quantity; (2) increase power frequency negative deviation feedforward to Reduce the excessive disturbance of the boiler thermal load when the power of the unit fluctuates due to grid frequency fluctuations. Field experiments show that the dynamic adjustment performance under the improved CCBF and CCTF coordination modes is significantly improved. 2.2 Feedforward loop modified parameter adjustment test Specific considerations are as follows: (1) When setting K3, avoid possible oscillations in the fuel close loop. The actual setting is currently 0.16. (2) The tuning of K2 frequency response coefficient is related to K3, but also taking into account the furnace side PID proportional coefficient in CCBF and CCTF. Since the tracking loop is working, when the fuel quantity - unit power is unbalanced, the feedforward dynamic part is completed by K2, K3, K2 should preferably be less than 0.75. The inertial link Ti value is related to the thermal inertia of the boiler, and should pass the test. Find the best value. The current actual setting is K2=0.65, K3=0.16, Ti=240s. (3) The setting of K1 must also consider BF1 operating conditions. Because feed forward/N0 feeds under BF1 conditions, the LDC feedforward actually becomes unit power and the current setting is 0.72. (4) The simplified feedforward ratio after the feedforward loop is improved. At the beginning of the dynamic process of the LDC unit load command change, the power and fuel are increased at the same time. The main control feed-forward ratio of the furnace is [email protected] = 0.87, that is, the amount of fuel and air flow required at the beginning of the dynamic process, and 87% is completed by feedforward. The remaining 13%, as well as the overshoot, are completed by the regulator. In the case of power fluctuations caused by cycle changes, the feedforward ratio [email protected] = 0.754, that is, the amount of fuel and air flow required at the beginning of the dynamic process. 75% of the fuel is completed by feed forward, and the remaining 25% and the overshoot are completed by the regulator. . The feedforward ratio of the fuel in the two variable load conditions accounts for most of the total fuel demand. The smaller part is then completed by the differential of the regulator and the proportional tracking adjustment, which effectively improves the dynamic performance of the system adjustment. C-type High Speed Punching Machine C-Type High Speed Punching Machine,C-Type 30 Tons High Speed Punch Machine,C-Type 65 Tons High Speed Punching Machine,High Speed Precision Punch Presses Dongguan Samhoor Precision Machinery Co.,Ltd , https://www.samhoor-press.com