CN110912127A - A differentiated control method for energy storage to improve grid stability - Google Patents

A differentiated control method for energy storage to improve grid stability Download PDF

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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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energy storage
bus
control method
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angular velocity
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唐雨晨
林章岁
叶荣
林毅
温步瀛
王怀远
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State Grid Fujian Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Fujian Electric Power Co Ltd
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State Grid Fujian Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Fujian Electric Power Co Ltd
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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
    • 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
    • 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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  • Power Engineering (AREA)
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Abstract

本发明涉及一种提升电网稳定性的储能差异化控制方法，包括以下步骤：步骤S1：采集电力系统中所有装有储能系统的母线的频率和电压相角，得到母线频率信息；步骤S2:根据采集到的频率信息,计算每一条母线的暂态指标;步骤S3:计算系统故障清除时刻的惯性中心角速度；步骤S4:根据暂态指标和系统故障清除时刻的惯性中心角速度，进行筛选分类；步骤S5:根据分类结果，得出需要进行储能控制的地点及其控制方式。本发明能够在线通过储能节点母线信息快速甄别储能控制地点,对受扰母线进行储能充放电调整，从而快速提高系统的稳定性。

Figure 201911280413

The present invention relates to a differentiated control method of energy storage for improving the stability of the power grid, comprising the following steps: Step S1: collecting the frequency and voltage phase angle of all the buses equipped with the energy storage system in the power system to obtain bus frequency information; Step S2 : calculate the transient index of each bus according to the collected frequency information; Step S3: calculate the inertial center angular velocity at the moment of system fault clearing; Step S4: carry out screening and classification according to the transient index and the inertial center angular velocity at the moment of system fault clearing ; Step S5: According to the classification result, obtain the location and control mode that need to carry out energy storage control. The invention can quickly identify the energy storage control location online through the information of the energy storage node busbar, and adjust the energy storage charge and discharge of the disturbed busbar, thereby rapidly improving the stability of the system.

Figure 201911280413

Description

Energy storage differentiation control method for improving power grid stability
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
Figure BDA0002316587700000021
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
Figure BDA0002316587700000041
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:
Figure BDA0002316587700000042
Figure BDA0002316587700000051
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)

1.一种提升电网稳定性的储能差异化控制方法，其特征在于，包括以下步骤：1. a kind of energy storage differential control method for improving grid stability, is characterized in that, comprises the following steps: 步骤S1：采集电力系统中所有装有储能系统的母线的频率和电压相角，得到母线频率信息；Step S1: collect the frequency and voltage phase angle of all the busbars equipped with the energy storage system in the power system, and obtain the busbar frequency information; 步骤S2:根据采集到的频率信息,计算每一条母线的暂态稳定指标；Step S2: according to the collected frequency information, calculate the transient stability index of each bus; 步骤S3:计算系统故障清除时刻的惯性中心角速度；Step S3: calculate the inertia center angular velocity at the moment of system fault clearing; 步骤S4:根据暂态指标和系统故障清除时刻的惯性中心角速度，进行筛选分类；Step S4: carry out screening and classification according to the angular velocity of the inertia center at the moment of transient index and system fault clearing; 步骤S5:根据分类结果，得出需要进行储能控制的地点及其控制方式。Step S5: According to the classification result, the location where the energy storage control needs to be performed and its control method are obtained. 2.根据权利要求1所述的一种提升电网稳定性的储能差异化控制方法，其特征在于，所述步骤S2具体为：根据采集到的母线信息，对每一条母线的暂态指标Ii：2. a kind of energy storage differential control method for improving grid stability according to claim 1, is characterized in that, described step S2 is specifically: according to the busbar information collected, to the transient index 1 of each busbar i : Ii＝(fic-fi0)(θic-θi0) (1)I i =(f ic -f i0 )(θ ic -θ i0 ) (1) 其中，Ii表示第i条母线的暂态指标，fic表示第i条母线故障清除时刻Tc的频率，fi0表示第i条母线稳定时刻T0的频率，θic表示第i条母线故障清除时刻Tc的电压相角，θi0表示第i条母线稳定时刻T0的电压相角。Among them, I i represents the transient index of the ith bus, f ic represents the frequency of the ith bus fault clearing time T c , f i0 represents the frequency of the ith bus stable time T 0 , θ ic represents the ith bus The voltage phase angle at the fault clearing time T c , θ i0 represents the voltage phase angle at the stable time T 0 of the ith bus. 3.根据权利要求1所述的一种提升电网稳定性的储能差异化控制方法，其特征在于，所述步骤S3具体为:计算系统故障清除时刻Tc的惯性中心角速度wcoic 3. a kind of energy storage differential control method for improving grid stability according to claim 1, is characterized in that, described step S3 is specifically: the inertia center angular velocity w coic of calculating system fault clearing moment T c
Figure FDA0002316587690000021
Figure FDA0002316587690000021
 其中，m表示发电机的台数；Mi表示第i台发电机的惯性时间常数，wic为第i台发电机的角速度。Among them, m represents the number of generators; M i represents the inertia time constant of the ith generator, and w ic is the angular velocity of the ith generator. 4.根据权利要求1所述的一种提升电网稳定性的储能差异化控制方法，其特征在于，所述步骤S4具体为：将计算得到的暂态指标进行筛选分类，得到集合A和集合B，4. The energy storage differential control method for improving power grid stability according to claim 1, wherein the step S4 is specifically: screening and classifying the calculated transient indicators to obtain a set A and a set B, 若Ii＞0且fic＞wcoic，则该母线属于集合A，表示故障后功角超前的电网区域，需要对该区域的储能进行充电控制；If I i > 0 and f ic > w coic , the bus belongs to the set A, which means that the power grid area is ahead of the power angle after the fault, and the energy storage in this area needs to be charged and controlled; 若Ii＞0且fic＜wcoic，则该母线属于集合B，表示故障后功角滞后的电网区域，需要对该区域的储能进行放电控制。If I i > 0 and f ic <w coic , the bus belongs to the set B, which means that the power angle lags behind the power grid area after the fault, and the energy storage in this area needs to be discharged.
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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
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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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
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Application publication date: 20200324