CN-119616908-B - Method for controlling rotation speed of compressed air energy storage compressor

CN119616908BCN 119616908 BCN119616908 BCN 119616908BCN-119616908-B

Abstract

The application relates to the technical field of compressed air energy storage simulation control, in particular to a rotational speed control method of a compressed air energy storage compressor, which comprises the steps of obtaining three-phase current of a motor stator by using a preset motor model, and obtaining a target rotational speed and a current rotational speed of the compressor by using a preset compressor model; the method comprises the steps of inputting a target compressor rotating speed, a current compressor rotating speed and three-phase current of a motor stator to a preset rotating speed control module, obtaining three-phase voltage controlled by the motor, controlling the rotating speed of the compressor based on the three-phase voltage, and starting an anti-surge valve to control the operation of the compressor when the surge margin of the compressor is smaller than a preset threshold value, wherein a compressor model, a motor model and the preset rotating speed control module are connected with each other. Therefore, the problems of low accuracy, low response speed and the like in the current compressor control method are solved, and the target rotating speed of the compressor and the output capacity of the motor are fully considered to rapidly and effectively control the rotating speed.

Inventors

ZOU ZUBING
HUANG KANG
WANG HONG
JIA YUNPENG
FAN LIANG
MEI SHENGWEI
ZHAO FANGLIANG
LI MENGCHAO
ZHANG XIAOLONG
HU JUNQING
TAN WEI
SHI YUNQIAN
ZUO YIMING

Assignees

中国长江三峡集团有限公司
中国三峡新能源(集团)股份有限公司
国水集团化德风电有限公司
上海勘测设计研究院有限公司
清华大学
安徽佑赛科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20241226

Claims (7)

1. The method for controlling the rotating speed of the compressed air energy storage compressor is characterized by comprising the following steps of: Acquiring three-phase current of a motor stator by using a preset motor model, and acquiring a target compressor rotating speed and a current compressor rotating speed by using a preset compressor model; Before the motor stator three-phase current is obtained by using the preset motor model, the method comprises the following steps: acquiring the gas density, the speed of the outlet gas and the temperature of the outlet gas in the compressor; based on the gas density inside the compressor, the speed of the outlet gas and the temperature of the outlet gas, establishing a constraint relation among the gas density, the speed of the outlet gas and the temperature of the outlet gas by utilizing a mass conservation formula, a momentum conservation formula and an energy conservation formula, and establishing a preset compressor model by utilizing a preset simulation platform; Inputting the target compressor rotating speed, the current compressor rotating speed and the motor stator three-phase current to a preset rotating speed control module to obtain motor-controlled three-phase voltage so as to control the rotating speed of the compressor based on the three-phase voltage, and starting an anti-surge valve to control the operation of the compressor when the surge margin of the compressor is smaller than a preset threshold value, wherein the compressor model, the motor model and the preset rotating speed control module are connected with each other; Comprising the following steps: Determining the opening of the anti-surge valve based on a preset anti-surge valve opening control formula and a preset anti-surge valve opening response formula to control the operation of the compressor based on the opening of the anti-surge valve, wherein the preset anti-surge valve opening control formula is as follows: ; Wherein, the And The proportional gain and the integral gain respectively, For a target surge margin, For the surge margin, The preset anti-surge valve opening response formula is as follows: ; Wherein, the Is the time constant of the valve and is set to be equal to the time constant of the valve, Is the target opening degree.
2. The method of claim 1, wherein said inputting the target compressor speed, the present compressor speed, and the motor stator three-phase current to a preset speed control module results in motor controlled three-phase voltages, comprising: Performing Clark transformation on the three-phase current of the motor stator by using the preset rotating speed control module to obtain current under a two-phase orthogonal coordinate system, and performing Park transformation on the current under the two-phase orthogonal coordinate system to obtain d-axis current and q-axis current under a rotating coordinate system; Calculating a first error value of d-axis current and a preset d-axis current value and a second error value of q-axis current and a preset q-axis current value, and respectively performing PI control on the first error value and the second error value to obtain a d-axis voltage control quantity and a q-axis voltage control quantity; performing inverse Park transformation on the d-axis voltage control quantity and the q-axis voltage control quantity to obtain voltages under a two-phase orthogonal coordinate system; and performing Space Vector Pulse Width Modulation (SVPWM) by using the voltage under the two-phase orthogonal coordinate system to obtain the three-phase voltage controlled by the motor.
3. The method of claim 1, wherein the mass conservation formula is: ; the momentum conservation formula is: ; the energy conservation formula is as follows: Wherein, the method comprises the steps of, For the volume of the compressor, For the inlet mass flow rate of the compressor, For the outlet mass flow rate of the compressor, For the velocity of the outlet gas, For the gas density at the compressor outlet, For the velocity of the inlet gas, As the pressure at the inlet port is a function of the pressure, As the pressure at the outlet port is a function of the pressure, For the inlet cross-sectional area of the compressor, For the propulsion of the impeller wheel, For the outlet cross-sectional area of the compressor, For the specific enthalpy of the outlet gas, Is the specific heat capacity of the material, Is a gas constant which is a function of the gas, As a function of the temperature of the outlet gas, The work to be done by the motor is, As a function of the time variable, Is the specific enthalpy of the gas.
4. A compressed air energy storage compressor rotational speed control system, comprising: the acquisition module is used for acquiring three-phase current of the motor stator by using a preset motor model, and acquiring a target compressor rotating speed and a current compressor rotating speed by using a preset compressor model; Before the motor stator three-phase current is acquired by using the preset motor model, the acquisition module is further configured to: acquiring the gas density, the speed of the outlet gas and the temperature of the outlet gas in the compressor; Based on the gas density inside the compressor, the speed of the outlet gas and the temperature of the outlet gas, establishing a constraint relation among the gas density, the speed of the outlet gas and the temperature of the outlet gas by utilizing a mass conservation formula, a momentum conservation formula and an energy conservation formula, and constructing the compressor model by utilizing a preset simulation platform; The control module is used for inputting the target compressor rotating speed, the current compressor rotating speed and the motor stator three-phase current into a preset rotating speed control module to obtain motor-controlled three-phase voltage so as to control the rotating speed of the compressor based on the three-phase voltage, and starting an anti-surge valve to control the compressor to operate when the surge margin of the compressor is smaller than a preset threshold value, wherein the compressor model, the motor model and the preset rotating speed control module are connected with each other; Comprising the following steps: Determining the opening of the anti-surge valve based on a preset anti-surge valve opening control formula and a preset anti-surge valve opening response formula to control the operation of the compressor based on the opening of the anti-surge valve, wherein the preset anti-surge valve opening control formula is as follows: ; Wherein, the And The proportional gain and the integral gain respectively, For a target surge margin, For the surge margin, The preset anti-surge valve opening response formula is as follows: ; Wherein, the Is the time constant of the valve and is set to be equal to the time constant of the valve, Is the target opening degree.
5. The system of claim 4, wherein the control module is further configured to: Performing Clark transformation on the three-phase current of the motor stator by using the preset rotating speed control module to obtain current under a two-phase orthogonal coordinate system, and performing Park transformation on the current under the two-phase orthogonal coordinate system to obtain d-axis current and q-axis current under a rotating coordinate system; Calculating a first error value of d-axis current and a preset d-axis current value and a second error value of q-axis current and a preset q-axis current value, and respectively performing PI control on the first error value and the second error value to obtain a d-axis voltage control quantity and a q-axis voltage control quantity; performing inverse Park transformation on the d-axis voltage control quantity and the q-axis voltage control quantity to obtain voltages under a two-phase orthogonal coordinate system; and performing Space Vector Pulse Width Modulation (SVPWM) by using the voltage under the two-phase orthogonal coordinate system to obtain the three-phase voltage controlled by the motor.
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method of controlling the rotational speed of a compressed air energy storage compressor according to any one of claims 1 to 3.
7. A computer readable storage medium having stored thereon a computer program, the program being executed by a processor for implementing a method of controlling a rotational speed of a compressed air energy storage compressor according to any one of claims 1 to 3.

Description

Method for controlling rotation speed of compressed air energy storage compressor Technical Field The application relates to the technical field of compressed air energy storage simulation control, in particular to a rotating speed control method of a compressed air energy storage compressor. Background Under the macroscopic instruction of responding to the national double-carbon target strategy, the development of new energy technology is coming to the unprecedented opportunity and becomes a key driving force for constructing a green, low-carbon and circular economy system. In view of the intermittent and unstable nature of wind and solar power generation, it is becoming particularly critical to develop efficient large-scale energy storage solutions. In this context, compressed air energy storage technology has become the focus of research by virtue of its large storage capacity, long energy storage period and high energy conversion efficiency. In designing and evaluating a compressed air energy storage system, it is extremely important to control the rotational speed of the compressor safely and effectively. On one hand, the rotation speed of the compressor directly relates to core parameters such as pressure ratio, efficiency and the like to influence the performance of the compressor, and on the other hand, the rotation speed of the compressor is closely related to the surge blocking phenomenon, so that the safe operation can be ensured only by controlling the rotation speed of the compressor. The method is generally operated within the range of design parameters of the compressor, does not depend on real-time feedback, and controls the rotating speed of a motor through a designed variable frequency driver, so that the rotating speed of the compressor is regulated, and the control mode is very simple and efficient and is suitable for application scenes under most stable working conditions. The method can monitor the current rotation speed of the compressor in real time and compare the current rotation speed with the set rotation speed, dynamically adjusts the output of the motor, so that the rotation speed is kept at a set point, and improves the accuracy and response speed of a control system compared with an open loop control method, but the pressure ratio and the mass flow rate of the compressor can be changed along with the change of the rotation speed when the variable working condition of the compressed air energy storage compressor is required, so that the power of the compressor can be changed, and the linear control system is difficult to realize a high-efficiency stable control effect when the linear control system is difficult to realize a strong nonlinear change, so that a more accurate and rapid control method is needed to control the rotation speed of the compressor. Disclosure of Invention The application provides a rotating speed control method of a compressed air energy storage compressor, which aims to solve the problems of low accuracy, low response speed and the like in the current compressor control method. An embodiment of a first aspect of the application provides a method for controlling a rotational speed of a compressed air energy storage compressor, comprising the steps of obtaining three-phase current of a motor stator by using a preset motor model, obtaining a target rotational speed of the compressor and a current rotational speed of the compressor by using the preset compressor model, inputting the target rotational speed of the compressor, the current rotational speed of the compressor and the three-phase current of the motor stator to a preset rotational speed control module to obtain three-phase voltage controlled by the motor, controlling the rotational speed of the compressor based on the three-phase voltage, and starting an anti-surge valve to control the operation of the compressor when a surge margin of the compressor is smaller than a preset threshold, wherein the compressor model, the motor model and the preset rotational speed control module are connected with each other. The method comprises the steps of obtaining three-phase voltage controlled by a motor by using a preset rotating speed control module, carrying out Clark transformation on the three-phase current of the motor stator to obtain current under a two-phase orthogonal coordinate system, carrying out Park transformation on the current under the two-phase orthogonal coordinate system to obtain d-axis current and q-axis current under a rotating coordinate system, calculating first error values of the d-axis current and a preset d-axis current value and second error values of the q-axis current and a preset q-axis current value, carrying out PI control on the first error values and the second error values respectively to obtain d-axis voltage control quantity and q-axis voltage control quantity, carrying out inverse Park transformation on the d-axis voltage control quantity and the q-axis voltage control