CN-121983935-A - Oil field well site direct current micro-grid source charge storage control system and control method of energy storage converter and alternating current bus converter in oil field well site direct current micro-grid source charge storage control system

Abstract

The invention belongs to the technical field of power system control, and particularly relates to an oilfield well site direct current micro-grid source charge storage control system and a control method of an energy storage converter and an alternating current bus converter in the oilfield well site direct current micro-grid source charge storage control system. The energy storage system converter adopts double closed-loop control of a voltage outer ring and a current inner ring, and a current reference value in the double closed-loop control is obtained by inputting a ratio of a bus voltage actual measurement value and a reference value of an oilfield well site direct current micro-grid and the reference value of the ratio into a linear expansion state observer to obtain an observation result, and inputting the observation result into a global quick terminal sliding mode controller to obtain the current reference value. The linear expansion state observer and the global quick terminal sliding mode controller are adopted for compound control, so that the system can adapt to the working condition of multi-load cooperation of a direct current micro-grid source charge storage system in an oilfield well site, and the stability and the robustness of the system are improved.

Inventors

• ZHANG YI
• GUO YANJIE
• XU LINGJUN
• WANG QIANG
• WANG WEIJIE
• LI MIN
• ZHAO ZHONGHUA
• HUANG LIJUN
• WEI YONG
• ZHANG HANG
• XU PENG
• WANG PENG
• YONG MINGCHAO
• HU YEBIN

Assignees

• 许继电气股份有限公司

Dates

Publication Date

20260505

Application Date

20251219

Claims (12)

1. 1. The control method of the energy storage system converter in the oilfield well site direct current micro-grid source charge storage system is characterized in that the energy storage system converter adopts double closed-loop control of a voltage outer ring and a current inner ring, and a current reference value in the double closed-loop control is obtained by the following method: And inputting the ratio of the bus voltage measured value and the reference value of the direct current micro-grid of the oilfield well site and the reference value of the ratio into a linear expansion state observer to obtain an observation result, and inputting the observation result into a global quick terminal sliding mode controller to obtain a current reference value.
2. 2. The method for controlling an energy storage system converter in an oilfield wellsite direct current micro-grid source charge storage system according to claim 1, wherein the mathematical expression of the linear expansion state observer is as follows: ; Where z 1 、z 2 、z 3 is the output of the extended state observer, z 1 、z 2 is the real-time estimate of the system state variable x 1 、x 2 by the extended state observer, z 3 is the estimate of the uncertainty factor, l 1 、l 2 、l 3 is the state observer coefficient, x 1 is the ratio, x 2 is the derivative of the ratio, 、 、 The differentiation of z 1 、z 2 、z 3 , respectively.
3. 3. The method for controlling an energy storage system converter in an oilfield well site direct current micro-grid source charge storage system according to claim 2, wherein the control law of the global quick terminal sliding mode controller is as follows: ; s 0 =1-z 1; Wherein c 1 is a compensation coefficient, the value of which is-1;s 0 , is a sliding mode control set sliding mode surface, alpha, beta are terminal sliding mode controller parameters, the control of linear term intensity influences convergence speed and control of nonlinear intensity respectively, b is control feedback gain, p and q are both positive and odd numbers, and the relation 1<p/q <2 is satisfied.
4. 4. The control method of the alternating current bus converter in the oil field well site direct current micro-grid source load storage system is characterized in that the alternating current bus converter adopts double closed-loop control of a voltage outer ring and a current inner ring, and an alternating current bus current reference value in the double closed-loop control is obtained by the following method: Inputting the ratio of the bus voltage actual measurement value and the reference value of the direct current micro-grid of the oilfield well site and the reference value of the ratio into a PI controller to obtain a first current reference value; Inputting the ratio of the bus voltage actual measurement value and the reference value of the oilfield well site direct current micro-grid and the reference value of the ratio into a linear expansion state observer to obtain an observation result, and inputting the observation result into a global quick terminal sliding mode controller to obtain a second current reference value; the first current reference value is added with the second current reference value to obtain an alternating current bus current reference value.
5. 5. The method for controlling an ac busbar inverter in an oilfield wellsite dc micro-grid source charge storage system of claim 4, wherein the mathematical expression of the linear extended state observer is as follows: ; Where z 1 、z 2 、z 3 is the output of the extended state observer, z 1 、z 2 is the real-time estimate of the system state variable x 1 、x 2 by the extended state observer, z 3 is the estimate of the uncertainty factor, l 1 、l 2 、l 3 is the state observer coefficient, x 1 is the ratio, x 2 is the derivative of the ratio, 、 、 The differentiation of z 1 、z 2 、z 3 , respectively.
6. 6. The method for controlling an ac busbar inverter in an oilfield wellsite dc micro-grid source charge storage system according to claim 5, wherein the control law of the global fast terminal sliding mode controller is as follows: ; s 0 =1-z 1; Wherein c 1 is a compensation coefficient, the value of which is-1;s 0 , is a sliding mode control set sliding mode surface, alpha, beta are terminal sliding mode controller parameters, the control of linear term intensity influences convergence speed and control of nonlinear intensity respectively, b is control feedback gain, p and q are both positive and odd numbers, and the relation 1<p/q <2 is satisfied.
7. 7. The direct current micro-grid source charge storage control system for the oilfield well site is characterized in that a current reference value in the double closed-loop control is obtained by adopting double closed-loop control of a voltage outer loop and a current inner loop of an energy storage system converter through the following method: And inputting the ratio of the bus voltage measured value and the reference value of the direct current micro-grid of the oilfield well site and the reference value of the ratio into a linear expansion state observer to obtain an observation result, and inputting the observation result into a global quick terminal sliding mode controller to obtain a current reference value.
8. 8. The oilfield wellsite direct current micro-grid source charge storage control system of claim 7, wherein the mathematical expression of the linear extended state observer is as follows: ; Where z 1 、z 2 、z 3 is the output of the extended state observer, z 1 、z 2 is the real-time estimate of the system state variable x 1 、x 2 by the extended state observer, z 3 is the estimate of the uncertainty factor, l 1 、l 2 、l 3 is the state observer coefficient, x 1 is the ratio, x 2 is the derivative of the ratio, 、 、 The differentiation of z 1 、z 2 、z 3 , respectively.
9. 9. The oilfield wellsite direct current micro-grid source charge storage control system of claim 8, wherein the control law of the global fast terminal sliding mode controller is as follows: ; s 0 =1-z 1; Wherein c 1 is a compensation coefficient, the value of which is-1;s 0 , is a sliding mode control set sliding mode surface, alpha, beta are terminal sliding mode controller parameters, the control of linear term intensity influences convergence speed and control of nonlinear intensity respectively, b is control feedback gain, p and q are both positive and odd numbers, and the relation 1<p/q <2 is satisfied.
10. 10. The utility model provides an oil field well site direct current microgrid source lotus stores up control system, wherein the double closed loop control of alternating current busbar transverter adoption voltage outer loop, electric current inner loop, its characterized in that, the alternating current busbar electric current reference value in the double closed loop control obtains through following method: Inputting the ratio of the bus voltage actual measurement value and the reference value of the direct current micro-grid of the oilfield well site and the reference value of the ratio into a PI controller to obtain a first current reference value; Inputting the ratio of the bus voltage actual measurement value and the reference value of the oilfield well site direct current micro-grid and the reference value of the ratio into a linear expansion state observer to obtain an observation result, and inputting the observation result into a global quick terminal sliding mode controller to obtain a second current reference value; the first current reference value is added with the second current reference value to obtain an alternating current bus current reference value.
11. 11. The oilfield wellsite direct current micro-grid source charge storage control system of claim 10, wherein the mathematical expression of the linear extended state observer is as follows: ; Where z 1 、z 2 、z 3 is the output of the extended state observer, z 1 、z 2 is the real-time estimate of the system state variable x 1 、x 2 by the extended state observer, z 3 is the estimate of the uncertainty factor, l 1 、l 2 、l 3 is the state observer coefficient, x 1 is the ratio, x 2 is the derivative of the ratio, 、 、 The differentiation of z 1 、z 2 、z 3 , respectively.
12. 12. The oilfield wellsite direct current micro-grid source charge storage control system of claim 11, wherein the control law of the global fast terminal sliding mode controller is as follows: ; s 0 =1-z 1; Wherein c 1 is a compensation coefficient, the value of which is-1;s 0 , is a sliding mode control set sliding mode surface, alpha, beta are terminal sliding mode controller parameters, the control of linear term intensity influences convergence speed and control of nonlinear intensity respectively, b is control feedback gain, p and q are both positive and odd numbers, and the relation 1<p/q <2 is satisfied.

Description

Oil field well site direct current micro-grid source charge storage control system and control method of energy storage converter and alternating current bus converter in oil field well site direct current micro-grid source charge storage control system Technical Field The invention belongs to the technical field of power system control, and particularly relates to an oilfield well site direct current micro-grid source charge storage control system and a control method of an energy storage converter and an alternating current bus converter in the oilfield well site direct current micro-grid source charge storage control system. Background Under the background of a double-carbon target, distributed renewable energy sources such as photovoltaic, wind power and the like are gradually introduced into an oilfield well site, and a novel power system taking a direct current micro-grid as a core is constructed. However, the problems of complex coupling of multi-energy flows, large voltage fluctuation of buses, slow dynamic response and the like are caused by the randomness and intermittence of a distributed power supply such as wind and light and the impact of loads such as a pumping unit. The traditional control method mostly adopts centralized or decentralized PID control, and is difficult to cope with multi-equipment strong coupling and nonlinear disturbance, so that the stability of the system is poor and the robustness is insufficient when the working condition is changed. In order to improve the stability and the robustness of the system, the prior art adopts voltage and current double closed-loop control of a voltage outer loop and a current inner loop, wherein the voltage outer loop is input into a bus voltage actual measurement value and a reference value of a direct current micro-grid of an oilfield well site, the current reference value is obtained after passing through a PI controller and is input into the current inner loop, and the method still adopts PID control, so that the stability and the robustness of the system still have the defects. In order to improve the stability and the robustness of the direct-current micro-grid of the oilfield well site, the prior art also provides a method such as sliding mode control and a state observer to be applied to micro-grid control, but a single control method cannot be fully suitable for an overall control strategy of the source-load-storage multi-subsystem cooperation of the direct-current micro-grid of the oilfield well site, and the stability and the robustness of the method still have the defects. When only sliding mode control is used, the control rate is designed as follows: In the formula, s 1 is a global rapid sliding mode, the formula is s 1=s0+αs0+βs0q/p,s0=1-udc/udcref, g (x) is an equation coefficient of a control quantity u of a system state x 2, f (x) is an equation function of the system state x 2, and alpha, beta, phi and lambda are sliding mode controller parameters respectively. The above control rate needs to rely on a specific mathematical model and there is no term for disturbance compensation. When only the linear extended state observer is employed, the controller is designed as follows: Wherein k p、kd is a controller control parameter. The above control rate has only a linear term and the response speed is limited. Therefore, the LESO-TSMC control strategy combines the quick response of sliding mode control and disturbance observation compensation of a linear expansion state observer, so that the system stability is improved. Disclosure of Invention The invention aims to provide an oilfield well site direct current micro-grid source charge storage control system and an energy storage converter and an alternating current bus converter control method thereof, which are used for solving the technical problems of poor stability and insufficient robustness of the oilfield well site direct current micro-grid in the prior art. In order to solve the technical problems, the invention provides a control method of an energy storage system converter in an oilfield well site direct current micro-grid source charge storage system, wherein the energy storage system converter adopts double closed-loop control of a voltage outer ring and a current inner ring, and a current reference value in the double closed-loop control is obtained by the following method: And inputting the ratio of the bus voltage measured value and the reference value of the direct current micro-grid of the oilfield well site and the reference value of the ratio into a linear expansion state observer to obtain an observation result, and inputting the observation result into a global quick terminal sliding mode controller to obtain a current reference value. Further, the mathematical expression of the linear extended state observer is as follows: Where z 1、z2、z3 is the output of the extended state observer, z 1、z2 is the real-time estimate of the system state variable x 1、x2 by the