CN110912127A - Energy storage differentiation control method for improving power grid stability - Google Patents
Energy storage differentiation control method for improving power grid stability Download PDFInfo
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- CN110912127A CN110912127A CN201911280413.9A CN201911280413A CN110912127A CN 110912127 A CN110912127 A CN 110912127A CN 201911280413 A CN201911280413 A CN 201911280413A CN 110912127 A CN110912127 A CN 110912127A
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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
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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
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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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Abstract
The invention relates to an energy storage differentiation control method for improving the stability of a power grid, which comprises the following steps: step S1: acquiring the frequency and voltage phase angles of all buses provided with an energy storage system in an electric power system to obtain bus frequency information; step S2, calculating the transient index of each bus according to the collected frequency information, step S3, calculating the inertia center angular velocity of the system at the moment of clearing the fault; s4, screening and classifying according to the transient index and the inertial center angular velocity at the system fault clearing time; and step S5, obtaining the location and the control mode of the energy storage according to the classification result. According to the invention, the energy storage control place can be quickly discriminated on line through the energy storage node bus information, and energy storage charging and discharging adjustment is carried out on the disturbed bus, so that the stability of the system is quickly improved.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to an energy storage differentiation control method for improving the stability of a power grid.
Background
Safe and stable operation of the power system is very important for social development and life of people. Transient stability control of a power system is an important measure for ensuring safety and stability of the power system. The energy storage system in the system can improve the transient stability of the system by balancing energy supply and demand, and can realize the functions of frequency adjustment, smooth load fluctuation and the like. In the transient stability process, a strategy for rapidly judging energy storage charging and discharging control is established, and the method has important significance for improving the stability of a power grid.
Disclosure of Invention
In view of the above, the present invention provides an energy storage differentiation control method for improving the stability of a power grid, which can quickly identify an energy storage control location through energy storage node bus information on line, and perform energy storage charging and discharging adjustment on a victim bus, so as to quickly improve the stability of a system.
In order to achieve the purpose, the invention adopts the following technical scheme:
an energy storage differentiation control method for improving the stability of a power grid comprises the following steps:
step S1: acquiring the frequency and voltage phase angles of all buses provided with an energy storage system in an electric power system to obtain bus frequency information;
step S2, calculating the transient index of each bus according to the collected frequency information;
step S3, calculating the inertia center angular velocity at the moment of clearing the system fault;
s4, screening and classifying according to the transient index and the inertial center angular velocity at the system fault clearing time;
and step S5, obtaining the location and the control mode of the energy storage according to the classification result.
Further, the step S2 is specifically: according to the collected bus information, transient index I of each busi：
Ii＝(fic-fi0)(θic-θi0) (1)
Wherein, IiRepresenting the transient indicator of the ith busbar, ficShowing the fault clearing time T of the ith buscFrequency of (f)i0Shows the stable time T of the ith bus0Frequency of (e), thetaicShowing the fault clearing time T of the ith buscPhase angle of voltage of thetai0Shows the stable time T of the ith bus0The phase angle of the voltage of (c).
Further, the step S3 is to calculate a system fault clearing time TcAngular velocity w of center of inertia ofcoic
Wherein m represents the number of generators; miRepresents the inertia time constant, w, of the ith generatoricIs the angular velocity of the ith generator.
Further, the step S4 is specifically: screening and classifying the transient indexes obtained by calculation to obtain a set A and a set B,
if Ii> 0 and fic＞wcoicIf the bus belongs to the set A, the bus represents a power grid area with a leading power angle after a fault, and the stored energy in the area needs to be charged and controlled.
If Ii> 0 and fic＜wcoicThen the bus belongs to set B, representing the power grid area with power angle lag after the fault, for whichAnd the stored energy of the region is subjected to discharge control.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the energy storage control place can be quickly discriminated by detecting the bus information on line, and energy storage charging and discharging adjustment is carried out on the disturbed bus, so that the stability of the system is quickly improved.
Drawings
FIG. 1 is a wiring diagram of an IEEE39 node system in one embodiment of the invention;
FIG. 2 is a flow chart of a method according to an embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
Referring to fig. 2, the present invention provides an energy storage differentiation control method for improving power grid stability, which includes the following steps:
step S1: acquiring the frequency and voltage phase angles of all buses provided with an energy storage system in an electric power system to obtain bus frequency information;
step S2, calculating the transient index of each bus according to the collected frequency information;
according to the collected bus information, transient index I of each busi：
Ii＝(fic-fi0)(θic-θi0) (1)
Wherein, IiRepresenting the transient indicator of the ith busbar, ficShowing the fault clearing time T of the ith buscFrequency of (f)i0Shows the stable time T of the ith bus0Frequency of (e), thetaicShowing the fault clearing time T of the ith buscPhase angle of voltage of thetai0Shows the stable time T of the ith bus0The phase angle of the voltage of (c).
Step S3, calculating the system fault clearing time TcAngular velocity w of center of inertia ofcoic
Wherein m represents the number of generators; miRepresents the inertia time constant, w, of the ith generatoricIs the angular velocity of the ith generator.
S4, screening and classifying according to the transient index and the inertial center angular velocity at the system fault clearing time;
screening and classifying the transient indexes obtained by calculation to obtain a set A and a set B,
if Ii> 0 and fic＞wcoicIf the bus belongs to a set A, the set represents the power grid area with surplus active power after the fault;
if Ii> 0 and fic＜wcoicThen the bus bar belongs to the set B, which represents the grid area with insufficient activity after the fault.
And step S5, obtaining the location and the control mode of the energy storage according to the classification result.
The set A is a place where charging control is needed for energy storage;
the set B is a place needing discharge control of the stored energy.
In this embodiment, the test system employs a 3-machine system, and the simulation software uses PSD-BPA. Transient process data output in the PSASP simulation process is used as actual measurement data of the WAMS system, the fault is set to be a three-phase short circuit grounding fault between buses 7-8, and the protection device starts to act to disconnect the line after 0.07 s. The method is adopted to obtain the frequency change information of all the buses of the system, and the selection of the energy storage control place is carried out according to the frequency change of the buses. The data of the frequency change of the bus provided with the energy storage system are obtained according to simulation as follows:
through calculation, the transient indexes of the two stored energy positions are both larger than 0.
| Machine set | G1 | G2 | G3 |
| Inertia moment | 10 | 10 | 10 |
| Angular velocity/Hz at Tc time | 50.2 | 50.1 | 49.95 |
The inertial center angular velocity at the time Tc was 50.1 Hz.
Thus, the energy storage system at node 5 is charge controlled and the energy storage system at node 9 is discharge controlled.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (4)
1. An energy storage differentiation control method for improving the stability of a power grid is characterized by comprising the following steps:
step S1: acquiring the frequency and voltage phase angles of all buses provided with an energy storage system in an electric power system to obtain bus frequency information;
step S2, calculating the transient stability index of each bus according to the collected frequency information;
step S3, calculating the inertia center angular velocity at the moment of clearing the system fault;
s4, screening and classifying according to the transient index and the inertial center angular velocity at the system fault clearing time;
and step S5, obtaining the location and the control mode of the energy storage according to the classification result.
2. The energy storage differentiation control method for improving power grid stability according to claim 1, wherein the step S2 specifically comprises: according to the collected bus information, transient index I of each busi：
Ii＝(fic-fi0)(θic-θi0) (1)
Wherein, IiRepresenting the transient indicator of the ith busbar, ficShowing the fault clearing time T of the ith buscFrequency of (f)i0Shows the stable time T of the ith bus0Frequency of (e), thetaicShowing the fault clearing time T of the ith buscPhase angle of voltage of thetai0Shows the stable time T of the ith bus0The phase angle of the voltage of (c).
3. The energy storage differentiation control method for improving power grid stability according to claim 1, wherein the step S3 is specifically to calculate a system fault clearing time TcAngular velocity w of center of inertia ofcoic
Wherein m represents the number of generators; miRepresents the inertia time constant, w, of the ith generatoricIs the angular velocity of the ith generator.
4. The energy storage differentiation control method for improving power grid stability according to claim 1, wherein the step S4 specifically comprises: screening and classifying the transient indexes obtained by calculation to obtain a set A and a set B,
if Ii> 0 and fic＞wcoicIf the bus belongs to the set A, the bus represents a power grid area with an advanced power angle after a fault, and the charging control of the stored energy in the area is required;
if Ii> 0 and fic＜wcoicAnd if the bus belongs to the set B, the bus represents a power grid area with lagging power angle after the fault, and the discharge control of the stored energy in the area is required.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120280569A1 (en) * | 2011-05-04 | 2012-11-08 | King Fahd University Of Petroleum And Minerals | Supercapacitor-based grid fault ride-through system |
| CN105244887A (en) * | 2015-09-21 | 2016-01-13 | 南方电网科学研究院有限责任公司 | Closed-loop control method for transient power angle instability of power system |
| CN105244871A (en) * | 2015-10-19 | 2016-01-13 | 南方电网科学研究院有限责任公司 | Transient power angle instability identification method and system |
| CN109038544A (en) * | 2018-07-02 | 2018-12-18 | 昆明理工大学 | A kind of transient stability recognition methods based on voltage trace feature |
-
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- 2019-12-13 CN CN201911280413.9A patent/CN110912127A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120280569A1 (en) * | 2011-05-04 | 2012-11-08 | King Fahd University Of Petroleum And Minerals | Supercapacitor-based grid fault ride-through system |
| CN105244887A (en) * | 2015-09-21 | 2016-01-13 | 南方电网科学研究院有限责任公司 | Closed-loop control method for transient power angle instability of power system |
| CN105244871A (en) * | 2015-10-19 | 2016-01-13 | 南方电网科学研究院有限责任公司 | Transient power angle instability identification method and system |
| CN109038544A (en) * | 2018-07-02 | 2018-12-18 | 昆明理工大学 | A kind of transient stability recognition methods based on voltage trace feature |
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| 卢龙辉: "一种锂离子电池储能系统建模及其对电网稳定性影响研究", 《中国优秀硕士学位论文全文数据库（电子期刊）工程科技Ⅱ辑》 * |
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