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

Active Publication Date: 2019-11-01
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, there is a problem that the doubly-fed variable-speed pumped storage power plant does not fully participate in the frequency and voltage support of the grid

Method used

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  • Multi-model predictive control method for doubly fed variable speed pumped storage unit
  • Multi-model predictive control method for doubly fed variable speed pumped storage unit
  • Multi-model predictive control method for doubly fed variable speed pumped storage unit

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to the technical field of doubly fed variable speed pumped storage unit power control, in particular to a multi-model predictive control method of the doubly fed variable speed pumped storage unit. The multi-model predictive control method comprises the following steps of using a linearized system model to carry out prediction, feedback correction and rolling optimization toobtain a reference power command of DFIM-VSPS, wherein the output of a control object is the voltage and frequency of a PCC point, and a controlled system is a power system including the doubly fed variable speed pumped storage unit and wind power; and selecting wind speed as measurable disturbance, load fluctuation and fault as unmeasurable disturbance, and switching between multiple model predictive controllers according to measured wind speed, wherein the steps are as follows: 1, a modeling of the doubly fed variable speed pumped storage unit, specifically, the modeling comprises a water diversion system, a water pump turbine, a doubly fed asynchronous motor, a control system and a power grid; and power control of the doubly fed variable speed pumped storage unit based on MMPC. Multi-model predictive control has better control performance and robustness in case of large disturbance and stabilizing wind power fluctuation.

Description

technical field [0001] The invention belongs to the technical field of power control of a doubly-fed variable-speed pumped-storage unit, and in particular relates to a multi-model predictive control method of a doubly-fed-variable-speed pumped-storage unit. Background technique [0002] Due to the use of maximum power tracking and power decoupling control, the inertia displayed by wind turbines is much smaller than that of conventional units, and its support for grid voltage and frequency is weak, and wind energy has strong randomness and weak controllability. It has always been a worldwide problem, and the use of energy storage can improve the regulation ability of power systems with high wind power penetration. Considering the cost, environment, benefit and technical maturity, the pumped storage power plant is currently the most effective and practical large-scale energy storage system, and has broad application prospects. For example, coastal areas and islands are expecte...

Claims

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Application Information

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IPC IPC(8): F03B15/00F03B13/06H02J3/12H02J3/24
CPCF03B13/06F03B15/00H02J3/12H02J3/24Y02E10/20Y02E60/16
Inventor 刘开培秦亮朱蜀葛思扬王方洲陈满李定林
Owner WUHAN UNIV
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