CN112491068A - Method for reducing active power regulation range of energy storage frequency modulation - Google Patents
Method for reducing active power regulation range of energy storage frequency modulation Download PDFInfo
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- CN112491068A CN112491068A CN202011312383.8A CN202011312383A CN112491068A CN 112491068 A CN112491068 A CN 112491068A CN 202011312383 A CN202011312383 A CN 202011312383A CN 112491068 A CN112491068 A CN 112491068A
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- energy storage
- droop
- frequency
- droop coefficient
- frequency modulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a method for reducing the active power regulation range of energy storage frequency modulation, which comprises the following steps: simulating the droop characteristic of the synchronous generator to control the energy storage inverter and establishing a linear energy storage frequency modulation droop control equation; setting an upper limit of an output frequency threshold value and a lower limit of the output frequency threshold value; setting a frequency positive regulation nonlinear droop coefficient, and setting a frequency negative regulation nonlinear droop coefficient; the obtained frequency positive regulation nonlinear droop coefficient and the frequency negative regulation nonlinear droop coefficient jointly form a dynamic droop coefficient miThe power regulation range is reduced by automatically regulating the droop coefficient; the obtained nonlinear droop coefficient miAnd replacing the traditional droop coefficient m in the linear energy storage frequency modulation droop control equation to obtain a novel dynamic droop control equation. The invention relates to an energy storage frequency adjusting method based on nonlinear droop controlBy the method, the frequency can be accurately adjusted.
Description
Technical Field
The invention relates to a method for reducing the active regulation range of energy storage frequency modulation.
Background
The capacity of a power grid is continuously increased, the structure of a regional power grid becomes complex, and a micro-grid formed by high-permeability distributed power supply points such as photovoltaic power, wind power and the like has the influence on the frequency stability of the large power grid due to the characteristics of low inertia and low damping. The energy storage unit is used as a power supply capable of being charged and discharged flexibly, can realize dynamic energy absorption and release in the microgrid, and has the advantages of replacement or not in maintaining the stability of the frequency at the side of the microgrid due to the fact that the energy storage unit is quick in response and flexible in control. The energy storage device is usually connected to the direct current side of the grid-connected inverter of the distributed power supply point to serve as a load regulation base.
At present, in the field of energy storage frequency modulation, a linear droop control scheme is mostly adopted, active-frequency droop control is utilized, frequency adjustment is realized by controlling active power, and the method has no flexibility.
Disclosure of Invention
The invention aims to provide a method for reducing the active regulation range of energy storage frequency modulation, which is based on the energy storage frequency regulation of nonlinear droop control and can effectively reduce the active regulation range of energy storage frequency modulation.
The invention is realized by adopting the following technical scheme:
a method for reducing the active regulation range of energy storage frequency modulation comprises the following steps:
1) simulating the droop characteristic of the synchronous generator to control the energy storage inverter and establishing a linear energy storage frequency modulation droop control equation;
2) improving a droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1), and setting an upper limit of an output frequency threshold;
3) improving a droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1), and setting a lower limit of an output frequency threshold;
4) setting a frequency positive regulation nonlinear droop coefficient on the basis of the upper limit of the output frequency threshold in the step 2);
5) setting a frequency negative regulation nonlinear droop coefficient on the basis of the lower limit of the output frequency threshold in the step 3);
6) the frequency positive regulation nonlinear droop coefficient and the frequency negative regulation nonlinear droop coefficient obtained in the step 4) and the step 5) jointly form a dynamic droop coefficient miThe power regulation range is reduced by automatically regulating the droop coefficient;
7) the nonlinear droop coefficient m obtained in the step 6)iAnd (3) replacing the traditional droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1) to obtain a novel dynamic droop control equation.
The further improvement of the invention is that the specific implementation method of the step 1) is as follows: analog synchronous transmitterControlling the energy storage inverter by the droop characteristic of the motor, and establishing a linear energy storage frequency modulation droop control equation: omega-omega0-mP; wherein: ω is the energy storage inverter output frequency; omega0Is a no-load output frequency reference value; m is the active power droop coefficient; p is the active power of the load distribution.
The further improvement of the invention is that the specific implementation method of the step 2) is as follows: improving a droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1), and setting an upper limit omega of an output frequency thresholdmax。
The further improvement of the invention is that the specific implementation method of the step 3) is as follows: improving a droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1), and setting a lower limit omega of an output frequency thresholdmin。
The further improvement of the invention is that the specific implementation method of the step 4) is as follows: setting a frequency positive regulation nonlinear droop coefficient on the basis of the output frequency threshold upper limit in the step 2):
wherein: and delta P is the difference value between the current output active power and the target active power.
The further improvement of the invention is that the concrete implementation method of the step 5) is as follows: setting a frequency negative regulation nonlinear droop coefficient on the basis of the lower limit of the output frequency threshold in the step 3):
the further improvement of the invention is that the specific implementation method of the step 6) is as follows: the frequency positive regulation nonlinear droop coefficient and the frequency negative regulation nonlinear droop coefficient obtained in the step 4) and the step 5) jointly form a dynamic droop coefficient mi：
The power regulation range is reduced by automatically adjusting the droop coefficient.
The further improvement of the invention is that the specific implementation method of the step 7) is as follows: will be described in detail6) The obtained non-linear sag coefficient miReplacing the traditional droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1), and obtaining a novel dynamic droop control equation: omega-omega0-miP。
Compared with the prior art, the invention has at least the following beneficial technical effects:
1. the invention provides an energy storage frequency adjusting method based on nonlinear droop control, which can realize accurate frequency adjustment.
2. The energy storage frequency adjusting method provided by the invention can effectively reduce the active adjusting range of the energy storage frequency modulation.
Drawings
FIG. 1 is a graph of energy storage inverter linear frequency droop characteristics;
fig. 2 is a non-linear frequency droop characteristic diagram of the energy storage inverter.
Fig. 3 is a comparison diagram of active power regulation of the energy storage inverter.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings.
As shown in fig. 1, the energy storage grid-connected control system controls the inverter by simulating the droop characteristic of the synchronous generator, and the traditional droop control equation is as follows:
ω＝ω0-mP (1)
in formula (1): ω is the energy storage inverter output frequency; omega0Is a no-load output frequency reference value; m is the active power droop coefficient; p is the active power of the load distribution. Conventional droop control is a type of differential adjustment.
The P-omega droop characteristic is in a linear relation, namely the droop coefficient m is a fixed value, if linear droop control is sampled, the problem of overlarge power regulation range can be caused, and equipment is disconnected in serious cases.
As shown in fig. 2, the present invention provides a method for reducing the active regulation range of energy storage frequency modulation by using nonlinear droop control. The power regulation range is reduced by automatically adjusting the droop coefficient. Dynamic coefficient of sag miCan be expressed as:
in formula (2): in order to ensure stable droop control, the upper limit and the lower limit of the output frequency threshold are set, namely omega is setmax、ωmin. And delta P is the difference value between the current output active power and the target active power.
As shown in fig. 3, when the power fluctuation is smaller in the case of the same active power adjustment, the power fluctuation is smaller in the nonlinear droop control, and when the power fluctuation occurs at the point a, the droop coefficient miThe frequency threshold value is gradually increased from the upper limit of the frequency threshold value to the working point A, and is gradually decreased from the working point A to the lower limit of the frequency threshold value. The conventional droop curve power fluctuation Δ P facing the same adjustment Δ ω at point A1Greater than the power fluctuation Delta P of the nonlinear droop curve2And the change rate of the output power of the energy storage inverter is greatly reduced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (8)
1. A method for reducing the active regulation range of energy storage frequency modulation is characterized by comprising the following steps:
1) simulating the droop characteristic of the synchronous generator to control the energy storage inverter and establishing a linear energy storage frequency modulation droop control equation;
2) improving a droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1), and setting an upper limit of an output frequency threshold;
3) improving a droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1), and setting a lower limit of an output frequency threshold;
4) setting a frequency positive regulation nonlinear droop coefficient on the basis of the upper limit of the output frequency threshold in the step 2);
5) setting a frequency negative regulation nonlinear droop coefficient on the basis of the lower limit of the output frequency threshold in the step 3);
6) the frequency positive regulation nonlinear droop coefficient and the frequency negative regulation nonlinear droop coefficient obtained in the step 4) and the step 5) jointly form a dynamic droop coefficient miThe power regulation range is reduced by automatically regulating the droop coefficient;
7) the nonlinear droop coefficient m obtained in the step 6)iAnd (3) replacing the traditional droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1) to obtain a novel dynamic droop control equation.
2. The method for reducing the active regulation range of energy storage frequency modulation according to claim 1, wherein the step 1) is implemented by the following steps: simulating the droop characteristic of the synchronous generator to control the energy storage inverter, and establishing a linear energy storage frequency modulation droop control equation: omega-omega0-mP; wherein: ω is the energy storage inverter output frequency; omega0Is a no-load output frequency reference value; m is the active power droop coefficient; p is the active power of the load distribution.
3. The method for reducing the active regulation range of energy storage frequency modulation according to claim 2, wherein the step 2) is realized by the following specific method: improving a droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1), and setting an upper limit omega of an output frequency thresholdmax。
4. The method for reducing the active regulation range of energy storage frequency modulation according to claim 3, wherein the step 3) is realized by the following specific method: improving a droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1), and setting a lower limit omega of an output frequency thresholdmin。
5. The method for reducing the active regulation range of energy storage frequency modulation according to claim 4, wherein the step 4) is realized by the following specific method: setting a frequency positive regulation nonlinear droop coefficient on the basis of the output frequency threshold upper limit in the step 2):
wherein: and delta P is the difference value between the current output active power and the target active power.
6. The method for reducing the active regulation range of energy storage frequency modulation according to claim 5, wherein the step 5) is realized by the following specific method: setting a frequency negative regulation nonlinear droop coefficient on the basis of the lower limit of the output frequency threshold in the step 3):
7. the method for reducing the active regulation range of energy storage frequency modulation according to claim 6, wherein the step 6) is implemented by: the frequency positive regulation nonlinear droop coefficient and the frequency negative regulation nonlinear droop coefficient obtained in the step 4) and the step 5) jointly form a dynamic droop coefficient mi：
The power regulation range is reduced by automatically adjusting the droop coefficient.
8. The method for reducing the active regulation range of energy storage frequency modulation according to claim 7, wherein the step 7) is implemented by the following steps: the nonlinear droop coefficient m obtained in the step 6)iReplacing the traditional droop coefficient m in the linear energy storage frequency modulation droop control equation in the step 1), and obtaining a novel dynamic droop control equation: omega-omega0-miP。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011312383.8A CN112491068A (en) | 2020-11-20 | 2020-11-20 | Method for reducing active power regulation range of energy storage frequency modulation |
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| CN202011312383.8A CN112491068A (en) | 2020-11-20 | 2020-11-20 | Method for reducing active power regulation range of energy storage frequency modulation |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006126003A1 (en) * | 2005-05-25 | 2006-11-30 | Cummins Generator Technologies Limited | Control system |
| CN103501021A (en) * | 2013-10-28 | 2014-01-08 | 南京工程学院 | Inverter droop control method capable of achieving secondary frequency modulation and pressure regulation |
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2020
- 2020-11-20 CN CN202011312383.8A patent/CN112491068A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006126003A1 (en) * | 2005-05-25 | 2006-11-30 | Cummins Generator Technologies Limited | Control system |
| CN103501021A (en) * | 2013-10-28 | 2014-01-08 | 南京工程学院 | Inverter droop control method capable of achieving secondary frequency modulation and pressure regulation |
Non-Patent Citations (1)
| Title |
|---|
| 魏斌等: "应用自适应下垂控制及补偿环节提高微网暂态性能研究", 《电力电容器与无功补偿》 * |
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