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MPC-based photo-thermal wind power combined frequency modulation model and frequency modulation strategy

A technology of solar thermal power generation and solar thermal power station, which is applied in wind power generation, photovoltaic power generation, electrical components, etc., can solve the problem of not using solar thermal power generation technology, and achieve easy energy storage scheduling, improve stability, and improve frequency modulation performance. Effect

Active Publication Date: 2021-09-17
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these studies have considered using wind farms and energy storage systems to participate in the frequency regulation of the power system alone or jointly, but have not used solar thermal power generation technology to participate in frequency regulation.

Method used

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  • MPC-based photo-thermal wind power combined frequency modulation model and frequency modulation strategy
  • MPC-based photo-thermal wind power combined frequency modulation model and frequency modulation strategy
  • MPC-based photo-thermal wind power combined frequency modulation model and frequency modulation strategy

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Embodiment 1

[0058] The present invention provides an MPC-based solar thermal wind power combined frequency modulation system, such as figure 1 As shown, it includes a wind farm, a solar thermal power generation system and an MPC frequency modulation controller. The wind farm and solar thermal power generation system are connected to the power grid through a step-up transformer and a transmission line. The solar thermal power generation system is divided into solar concentrated A heat collection subsystem, a heat storage subsystem and a thermodynamic cycle subsystem; the MPC frequency modulation controller is connected to the wind farm, the solar thermal power generation system and the power grid.

Embodiment 2

[0060] The present invention also provides a frequency modulation model based on an MPC-based solar thermal wind power combined frequency modulation model, including:

[0061] Step 1. The MPC-based frequency modulation controller performs optimization calculations based on the current state of the power grid, wind farm, and solar-thermal power generation system, and sends power control commands to the wind farm and solar-thermal power generation system respectively. and After the wind farm and the solar-thermal power generation system receive the control command, the wind farm and the solar-thermal power generation system generate additional power ΔP to the grid respectively. w，k , It is indicated here that the superscript dis is the power released by the steam turbine unit of the solar thermal power station, and when the additional power is positive, it means that the active output is increased, and when the additional power is negative, it means that the active output is...

Embodiment 3

[0078] The present invention also provides a frequency modulation strategy based on an MPC-based solar thermal wind power combined frequency modulation model, including the following steps:

[0079] Step 1. Select time k as the sampling time. According to the real-time grid frequency and active power imbalance obtained from the grid at the current moment, an open-loop optimization problem with a finite time domain D is solved online, and a control sequence with a length of time domain D is obtained. It contains the power control signal of the solar thermal power generation system and the power control signal of the wind farm at D moments in the future, and finally selects the first element of the control sequence to act on the power system;

[0080] Step 2, repeat the same process as at time k at sampling time k+1, and continuously use the new grid frequency and active power imbalance to optimize and solve the problem, so as to ensure the stability of grid frequency;

[0081] ...

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Abstract

The invention discloses an MPC-based photo-thermal and wind power combined frequency modulation model and a frequency modulation strategy. The method comprises the steps: taking 1 min as a time scale, and enabling a control time period to be continuous; pushing a calculation system to continuously roll forwards under the condition of meeting various inequality constraints by combining the active power unbalance amount of the power grid obtained in advance in each time period and various system state parameters of the power station in each time period, so as to realize continuous optimization of the frequency modulation capability of the system; finally, carrying out the simulation analysis on the proposed wind power photo-thermal combined frequency modulation optimization control strategy, wherein the result shows that the photo-thermal power generation system provided with the heat storage tank can indeed reduce the frequency modulation pressure of the power grid, and the frequency modulation performance of the power grid is effectively improved.

Description

technical field [0001] The invention belongs to the field of combined solar-thermal-wind power generation, and in particular relates to an MPC-based combined frequency modulation model and strategy for solar-thermal-wind power generation. Background technique [0002] With the continuous consumption of fossil fuels in the world, solar power generation, as a renewable clean energy power generation technology, has become one of the important directions for the development of new energy power generation in today's society. At present, relatively mature solar power generation technologies can be divided into two categories: solar photovoltaic (photovoltaic, PV) power generation and solar thermal (concentrating solar power, CSP) power generation. [0003] Solar thermal power generation technology is equipped with a thermal energy storage subsystem (TES), so it has a large heat storage capacity, and can realize the translation of power generation with time, has good adjustment abi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/241H02J2203/20Y02E70/30
Inventor 郭苏王豪威裴焕金何意宋国涛阿依努尔·库尔班杜心茹郑堃
Owner HOHAI UNIV
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