Water turbine for power system stability calculation and water diversion system parameter modeling and testing method
A technology for power system stability and water diversion system, which is applied in calculation, data processing applications, instruments, etc., can solve the problems of inaccurate values of water flow inertia time constants, water turbines and water diversion system models, etc. Efficiency, the effect of accurate test value
Active Publication Date: 2020-08-07
云南电力试验研究院(集团)有限公司 +1
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Problems solved by technology
[0004]
The present invention provides a water flow inertia time parameter modeling and testing method for water turbines and water diversion systems that is easy to implement, meets the requirements of precision and is suitable for full working condition simulation, and solves the problem of the current power system stability calculation water flow inertia time constant value Imprecision, limitations of turbine and diversion system models
Method used
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Embodiment 1
[0035] Example 1: No. 2 unit of a power station, the unit type is mixed flow, the water delivery system adopts single-unit single-pipe water diversion mode, rated active power is 600MW, rated water head is 111m, maximum water head is 125.9m, minimum water head is 94.7m, and rated flow rate is 597.95m 3 / s.
[0036] Under the water head of 110m, the units have active power of 250MW, 480MW, and 600MW respectively, and a given step of ±10% guide vane is applied to the governor, and the active power waveform is as follows image 3 , Figure 4 , Figure 5 shown;
[0037] In the same way, the above test is repeated under a water head of 116m, and the test waveform process is similar.
[0038] Table 1 shows the operating point parameters and active power reverse adjustment value of the unit under the water head of 110m and 116m;
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The invention discloses a water turbine for power system stability calculation and a water diversion system parameter modeling and testing method, and the method comprises the steps: 1), carrying outthe guide vane given step disturbance of a hydroelectric generating set in grid-connected operation at different working condition points, and obtaining an active power reverse regulation rule; 2) improving a traditional water turbine and water diversion system model; (3) measuring the outlet flow inertia time constant of the hydroelectric generating set to be measured; 4) checking the improved water turbine and water diversion system model and identifying the effectiveness of the water flow inertia time constant. According to the method, the active power initial value is directly associated with the water turbine and the water diversion system model, active power reverse adjustment changes under multiple working conditions are achieved, when the active power initial value of the unit changes, electric power stability calculation technicians do not need to modify water flow inertia time constants one by one in a stability calculation program, and the working efficiency is remarkably improved; and the model is wider in general working condition, the test method is simple, the test value is accurate, and the stability calculation precision of the power system is greatly improved.
Description
technical field [0001] The invention relates to a water turbine and water diversion system parameter testing and modeling method used for power system stability calculation. Background technique [0002] After the asynchronous network operation of the Yunnan power grid, the large-scale hydropower unit’s active power reversed by the water hammer effect seriously deteriorated the stable operation of the system. Sudden changes will cause the water flow to impact the pipe wall, and the water pressure in the pipe will rise or fall, which will cause phase lag and negative damping to the system. In the event of system frequency oscillation, ultra-low frequency oscillation is prone to occur. In the calculation of power stability, it represents the water hammer effect The main parameter of is the water flow inertia time constant (Tw) in the turbine and water diversion system model. [0003] The physical characterization of the water flow inertia time constant is the time it takes fo...
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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/067G06Q50/06Y02E10/20
Inventor 何常胜胡亚州陈义宣董鸿魁苏杭吴水军
Owner 云南电力试验研究院(集团)有限公司
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