US-12620811-B2 - Grid-connected power regulation method for energy storage converter, and computer-readable storage medium and energy storage converter

US12620811B2US 12620811 B2US12620811 B2US 12620811B2US-12620811-B2

Abstract

An energy storage converter, a control method and device for the energy storage converter, and a computer readable storage medium are provided. The control method includes: obtaining an operation state of a power grid; under the condition that the power grid operates in a normal state, controlling the energy storage converter to operate in a grid-connected mode; and under the condition that the power grid operates in an abnormal state, controlling the energy storage converter to operate in an island mode. In the grid-connected mode, the energy storage converter uses active power and reactive power decoupling control. In the island mode, the energy storage converter uses virtual magnetic flux control.

Inventors

Eryong Guan
Ruiqiu JI

Assignees

Jingtsing Technology Ltd

Dates

Publication Date: 20260505
Application Date: 20220325
Priority Date: 20211125

Claims (15)

1 . A control method for an energy storage converter, wherein the energy storage converter is connected to a power grid, the control method comprising: obtaining an operation state of the power grid; limiting the energy storage converter to operate in a grid-connected mode under the condition that the power grid operates in a normal state; limiting the energy storage converter to operate in an island mode under the condition that the power grid operates in an abnormal state, wherein in the grid-connected mode, the energy storage converter uses active power and reactive power decoupling control, and in the island mode, the energy storage converter uses virtual magnetic flux control; and in response to a first instruction, limiting the energy storage converter to operate according to an angle information and a compensation voltage value output by a virtual synchronous generator.
2 . The control method for an energy storage converter according to claim 1 , wherein the step of limiting the energy storage converter to operate in a grid-connected mode comprises: obtaining a first current value on the power grid and a first voltage value of a capacitor on the power grid; determining a first angle value according to the first voltage value; determining a second voltage value, a third voltage value, a second current value and a third current value according to the first voltage value and the first current value; receiving an active power instruction value and a reactive power instruction value; determining a first instruction current value and a second instruction current value according to the active power instruction value, the reactive power instruction value, the second voltage value and the third voltage value; inputting the second current value, the third current value, the first instruction current value and the second instruction current value into a proportional integral controller, to render a first output result; and determining a first pulse width modulation signal according to the first output result, a feedback voltage of the power grid and the first angle value, and limiting the energy storage converter to operate according to the first pulse width modulation signal.
3 . The control method for an energy storage converter according to claim 2 , wherein the step of limiting the energy storage converter to operate in an island mode comprises: obtaining the first current value on the power grid and the first voltage value of the capacitor on the power grid; determining the first angle value according to the first voltage value; determining the second voltage value, the third voltage value, the second current value and the third current value according to the first voltage value and the first current value; receiving a given voltage value of the capacitor on the power grid; inputting the given voltage value, the second voltage value and the third voltage value into the proportional integral controller to render a second output result; inputting the second output result, the second current value and the third current value into the proportional integral controller to render a third output result; receiving a given angle value and inputting the given angle value and the first angle value into the proportional integral controller to render a fourth output result; and determining a second pulse width modulation signal according to the third output result, the feedback voltage of the power grid and the fourth output result, and limiting the energy storage converter to operate according to the second pulse width modulation signal.
4 . The control method for an energy storage converter according to claim 2 , wherein the step of limiting the energy storage converter to operate according to an angle information and a compensation voltage value output by a virtual synchronous generator comprises: determining an angle instruction value according to the angle information; obtaining the first current value on the power grid and the first voltage value of the capacitor on the power grid; determining the first angle value according to the first voltage value; determining the second voltage value, the third voltage value, the second current value and the third current value according to the first voltage value and the first current value; receiving the given voltage value of the capacitor on the power grid; inputting the compensation voltage value, the given voltage value, the second voltage value and the third voltage value into the proportional integral controller to render a fifth output result; inputting the fifth output result, the second current value and the third current value into the proportional integral controller to render a sixth output result; inputting the angle instruction value and the first angle value into the proportional integral controller to render a seventh output result; and determining a third pulse width modulation signal according to the sixth output result, the feedback voltage of the power grid and the seventh output result, and limiting the energy storage converter to operate according to the third pulse width modulation signal.
5 . The control method for an energy storage converter according to claim 1 , further comprising: in the case that an electrical signal transmitted by the power grid is received, determining that the power grid operates in the normal state; and in the case that the electrical signal transmitted by the power grid is not received, determining that the power grid operates in the abnormal state.
6 . The control method for an energy storage converter according to claim 2 , further comprising: in the case that an electrical signal transmitted by the power grid is received, determining that the power grid operates in the normal state; and in the case that the electrical signal transmitted by the power grid is not received, determining that the power grid operates in the abnormal state.
7 . The control method for an energy storage converter according to claim 3 , further comprising: in the case that an electrical signal transmitted by the power grid is received, determining that the power grid operates in the normal state; and in the case that the electrical signal transmitted by the power grid is not received, determining that the power grid operates in the abnormal state.
8 . The control method for an energy storage converter according to claim 1 , further comprising: in the case that an electrical signal transmitted by the power grid is received, determining that the power grid operates in the normal state; and in the case that the electrical signal transmitted by the power grid is not received, determining that the power grid operates in the abnormal state.
9 . The control method for an energy storage converter according to claim 4 , further comprising: in the case that an electrical signal transmitted by the power grid is received, determining that the power grid operates in the normal state; and in the case that the electrical signal transmitted by the power grid is not received, determining that the power grid operates in the abnormal state.
10 . A computer readable storage medium, a program or an instruction is stored on the computer readable storage medium, when the program or the instruction is executed by a processor, the following steps are achieved: obtaining an operation state of a power grid; limiting an energy storage converter to operate in a grid-connected mode in the case that the power grid operates in a normal state; limiting the energy storage converter to operate in an island mode in the case that the power grid operates in an abnormal state, wherein in the grid-connected mode, the energy storage converter uses active power and reactive power decoupling control, and in the island mode, the energy storage converter uses virtual magnetic flux control; and in response to a first instruction, limiting the energy storage converter to operate according to an angle information and a compensation voltage value output by a virtual synchronous generator.
11 . The computer readable storage medium according to claim 10 , wherein the step of limiting the energy storage converter to operate in a grid-connected mode comprises: obtaining a first current value on the power grid and a first voltage value of a capacitor on the power grid; determining a first angle value according to the first voltage value; determining a second voltage value, a third voltage value, a second current value and a third current value according to the first voltage value and the first current value; receiving an active power instruction value and a reactive power instruction value; determining a first instruction current value and a second instruction current value according to the active power instruction value, the reactive power instruction value, the second voltage value and the third voltage value; inputting the second current value, the third current value, the first instruction current value and the second instruction current value into a proportional integral controller, to render a first output result; and determining a first pulse width modulation signal according to the first output result, a feedback voltage of the power grid and the first angle value, and limiting the energy storage converter to operate according to the first pulse width modulation signal.
12 . The computer readable storage medium according to claim 11 , wherein the step of limiting the energy storage converter to operate in an island mode comprises: obtaining the first current value on the power grid and the first voltage value of the capacitor on the power grid; determining the first angle value according to the first voltage value; determining the second voltage value, the third voltage value, the second current value and the third current value according to the first voltage value and the first current value; receiving a given voltage value of the capacitor on the power grid; inputting the given voltage value, the second voltage value and the third voltage value into the proportional integral controller to render a second output result; inputting the second output result, the second current value and the third current value into the proportional integral controller to render a third output result; receiving a given angle value and inputting the given angle value and the first angle value into the proportional integral controller to render a fourth output result; and determining a second pulse width modulation signal according to the third output result, the feedback voltage of the power grid and the fourth output result, and limiting the energy storage converter to operate according to the second pulse width modulation signal.
13 . The computer readable storage medium according to claim 11 , wherein the step of limiting the energy storage converter to operate according to an angle information and a compensation voltage value output by a virtual synchronous generator comprises: determining an angle instruction value according to the angle information; obtaining the first current value on the power grid and the first voltage value of the capacitor on the power grid; determining the first angle value according to the first voltage value; determining the second voltage value, the third voltage value, the second current value and the third current value according to the first voltage value and the first current value; receiving the given voltage value of the capacitor on the power grid; inputting the compensation voltage value, the given voltage value, the second voltage value and the third voltage value into the proportional integral controller to render a fifth output result; inputting the fifth output result, the second current value and the third current value into the proportional integral controller to render a sixth output result; inputting the angle instruction value and the first angle value into the proportional integral controller to render a seventh output result; and determining a third pulse width modulation signal according to the sixth output result, the feedback voltage of the power grid and the seventh output result, and limiting the energy storage converter to operate according to the third pulse width modulation signal.
14 . The computer readable storage medium according to claim 10 , wherein, when the program or the instruction is executed by a processor, the following steps are further achieved: in the case that an electrical signal transmitted by the power grid is received, determining that the power grid operates in the normal state; and in the case that the electrical signal transmitted by the power grid is not received, determining that the power grid operates in the abnormal state.
15 . A energy storage converter, comprising the computer readable storage medium according to claim 10 .

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a National Stage Entry under 35 U.S.C. § 371 of PCT International Application No. PCT/CN2022/083095, filed on Mar. 25, 2022, which claims priority to Chinese Patent Application No. 202111413225.6 filed with China National Intellectual Property Administration on Nov. 25, 2021 and entitled “ENERGY STORAGE CONVERTER, CONTROL METHOD AND DEVICE THEREFOR, AND COMPUTER READABLE STORAGE MEDIUM”, the entire contents of each of which are herein incorporated by reference. FIELD The present disclosure relates to the field of control technologies, and specifically, relates to an energy storage converter, a control method and a device therefor, and a computer readable storage medium. BACKGROUND An energy storage converter is usually connected to a power grid, and the conversion between a direct-current and an alternating-current is conducted through limiting the charging and discharging process of a battery. A person skilled in the art found that the energy storage converter could not provide supports of voltage and frequency, and could not provide power for important or sensitive loads once the power grid fails. SUMMARY The present disclosure aims to solve at least one of the problems in the prior art or the related art. Therefore, the first aspect of the present disclosure provides a control method for an energy storage converter. The second aspect of the present disclosure provides a control device of an energy storage converter. The third aspect of the present disclosure provides another control device of an energy storage converter. The fourth aspect of the present disclosure provides a computer readable storage medium. The fifth aspect of the present disclosure provides an energy storage converter. In view of this, according to the first aspect of the present disclosure, the present disclosure provides a control method for an energy storage converter, the energy storage converter is connected to a power grid, and the control method comprises: obtaining an operation state of the power grid; limiting the energy storage converter to operate in a grid-connected mode under the condition that the power grid operates in a normal state; and limiting the energy storage converter to operate in an island mode under the condition that the power grid operates in an abnormal state, wherein in the grid-connected mode, the energy storage converter uses active power and reactive power decoupling control, and in the island mode, the energy storage converter uses virtual magnetic flux control. The embodiment of the present disclosure provides a control method for an energy storage converter, in the control method, through obtaining the operation state of the power grid, the energy storage converter is limited to enter different control modes according to the operation state of the power grid; in the grid-connected mode, the decoupling control is conducted according to the active power and the reactive power, so as to maintain a balance of the active power and the reactive power according to a scheduling instruction of an upper level and provide qualified electrical energy to the power grid. However, in the island mode, the virtual magnetic flux control is adopted, so as to quickly establish voltage and frequency support for the local, and supply a reliable electrical energy quality for important loads and sensitive loads. In addition, the control method for an energy storage converter provided in the present disclosure further comprises the following additional features. In the above embodiments, limiting the energy storage converter to operate in a grid-connected mode comprises: obtaining a first current value on the power grid and a first voltage value of a capacitor on the power grid; determining a first angle value according to the first voltage value; determining a second voltage value, a third voltage value, a second current value and a third current value according to the first voltage value and the first current value; receiving an active power instruction value and a reactive power instruction value; determining a first instruction current value and a second instruction current value according to the active power instruction value, the reactive power instruction value, the second voltage value and the third voltage value; inputting the second current value, the third current value, the first instruction current value and the second instruction current value into a proportional integral controller, to render a first output result; and determining a first pulse width modulation signal according to the first output result, a feedback voltage of the power grid and the first angle value, and limiting the energy storage converter to operate according to the first pulse width modulation signal. In the embodiment, in the grid-connected mode, the power grid can maintain the stability of the voltage and the frequency, and therefore, after the active power instruction value an