Multi-model predictive control method for doubly fed variable speed pumped storage unit
A pumped storage unit, predictive control technology, applied in mechanical equipment, hydroelectric power generation, engine components, etc., can solve the problems of not fully participating in grid frequency and voltage support, and achieve improved system reliability, good control performance, and good voltage and the effect of frequency support
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Embodiment 1
[0097] Example 1: Under the power generation condition, the load of No. 9 busbar appears a step and increases by 100MW.
[0098] from Figure 8 It can be seen that the performance of MPC control is significantly better than that of constant power control in the case of load steps.
Embodiment 2
[0099] Example 2: A three-phase short circuit occurs in the line between No. 9 bus and No. 11 bus under the working condition of the water pump, and the faulty line is cut off after 0.1s.
[0100] from Figure 9 It can be seen that the performance of MPC is also significantly better than that of constant power control when there is a large disturbance such as a three-phase short circuit.
Embodiment 3
[0101] Example 3: The wind speed fluctuates under the power generation condition, and the wind speed fluctuation is set as the superposition of gust wind and random wind.
[0102] from Figure 10 It can be seen that since the wind speed is defined as a measurable error in this embodiment and is used for model prediction and feedback correction, when the wind speed fluctuates, the MPC can respond in advance, unlike the PI control that has to wait until the PCC frequency and It can only respond when the voltage deviates. It can be seen from the active and reactive power commands that the control signal of MPC will be ahead of the PI control, and the fluctuation will be smaller. From the perspective of PCC voltage and frequency, the fluctuation amplitude of MPC control will be smaller than that of PI control, which can provide better voltage and inertia support, and the change of VSPS speed will be smoother, and MPC has a better effect on random wind speed fluctuations. robustne...
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