CN110311415B - Transient stability margin evaluation method for renewable energy power generation base - Google Patents

Transient stability margin evaluation method for renewable energy power generation base Download PDF

Info

Publication number
CN110311415B
CN110311415B CN201910726872.9A CN201910726872A CN110311415B CN 110311415 B CN110311415 B CN 110311415B CN 201910726872 A CN201910726872 A CN 201910726872A CN 110311415 B CN110311415 B CN 110311415B
Authority
CN
China
Prior art keywords
power generation
renewable energy
grid
energy power
generation base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910726872.9A
Other languages
Chinese (zh)
Other versions
CN110311415A (en
Inventor
姚骏
裴金鑫
孙鹏
刘远
赵阳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing University
Original Assignee
Chongqing University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing University filed Critical Chongqing University
Priority to CN201910726872.9A priority Critical patent/CN110311415B/en
Publication of CN110311415A publication Critical patent/CN110311415A/en
Application granted granted Critical
Publication of CN110311415B publication Critical patent/CN110311415B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Energy or water supply
    • H02J3/383—
    • H02J3/386—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

Landscapes

  • Business, Economics & Management (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Economics (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • General Health & Medical Sciences (AREA)
  • Human Resources & Organizations (AREA)
  • Marketing (AREA)
  • Primary Health Care (AREA)
  • Strategic Management (AREA)
  • Tourism & Hospitality (AREA)
  • Physics & Mathematics (AREA)
  • General Business, Economics & Management (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a transient stability margin evaluation method suitable for a renewable energy power generation base in a low voltage ride through period, which comprises the steps of firstly obtaining the voltage of a fault point of a power gridAmplitude | UfTotal active current instruction injected into grid-connected point by renewable energy power generation base
Figure DDA0002159213330000011
And total reactive current command
Figure DDA0002159213330000012
Then, calculating a total current instruction I injected into a grid-connected point by the renewable energy power generation base*Angle of command current
Figure DDA0002159213330000013
And transmission line impedance angle thetaZ: based on the obtained | Uf|、I*、
Figure DDA0002159213330000014
And thetaZCalculating a transient instability boundary Amax: and then calculating the transient stability margin of the renewable energy power generation base during the fault: namely, it is
Figure DDA0002159213330000015
If MTVA is more than or equal to 0, the stability is ensured; otherwise, the stability is lost. The transient state instability criterion can be used as a transient state instability criterion of the renewable energy power generation base under the power grid fault, and the transient state stability margin of the renewable energy power generation base can be quantitatively measured.

Description

Transient stability margin evaluation method for renewable energy power generation base
Technical Field
The invention relates to a transient instability criterion and a transient stability margin quantitative evaluation method thereof under a power grid short-circuit fault for a double-fed induction wind power grid-connected system, an inverter type wind power grid-connected system (such as a permanent magnet direct-drive wind power system) and a photovoltaic power generation grid-connected system, and provides a transient instability criterion and a quantifiable transient stability margin index of a renewable energy power generation base in a low-voltage ride-through process.
Background
With the rapid development of renewable energy sources such as wind power, photovoltaic and the like, large-scale wind power plants and photovoltaic power stations are planned and built more and more. But the power electronization degree of the renewable energy power generation equipment is higher, the operation characteristics of the renewable energy power generation equipment are different from those of the traditional synchronous generator, and great complexity is brought to the stability analysis of a renewable energy power generation base. Particularly, when a short-circuit fault occurs in a power grid, the transient instability criterion and the transient stability margin evaluation method of the traditional power system are difficult to be applied to the renewable energy power generation base. Therefore, it is necessary to provide a transient instability criterion and a transient stability margin quantitative evaluation method suitable for a renewable energy power generation base. Relevant studies have been carried out by scholars at home and abroad, such as the following published documents:
[1]Jiabing Hu,Bo Wang,Weisheng Wang,Haiyan Tang,Yongning Chi,and Qi Hu.Small Signal Dynamics of DFIG-Based Wind Turbines During Riding Through Symmetrical Faults in WeakAC Grid[J].IEEE Transactions on Energy Conversion,2017,32(2):720-730.
[2]Bo Wen,Dong Dong,Dushan Boroyevich,Rolando Burgos,Paolo Mattavelli,and Zhiyu Shen.Impedance-based analysis of grid-synchronization stability for three-phase paralleled converters[J].IEEE Transactions on Power Electronics,2016,31(1):26-38.
the method comprises the following steps that a complex torque coefficient method is utilized to analyze the influence of phase-locked loops and current loop control parameters of a double-fed grid-connected system on the small signal stability of the double-fed wind power generation system under the condition of a weak grid serious fault. The document [2] evaluates the influence of the dynamic performance of the phase-locked loop on the dynamic stability of the grid-connected inverter system by using an impedance modeling method. None of the above documents addresses the small signal stability of renewable energy power plants and does not relate to the analysis and evaluation of the transient stability of the system. In fact, when a serious short-circuit fault occurs in the power grid, the interaction between the output power flow of the renewable energy power generation base and the line impedance may cause the system to have no balance point, so that the renewable energy power generation base is subjected to transient instability, and then collapse and off-grid.
Disclosure of Invention
In view of the above-mentioned deficiencies in the prior art, the present invention provides a transient stability margin evaluation method for a renewable energy power generation base during a low voltage ride through period, which can determine whether a system is transient unstable according to a grid voltage drop degree, an active and reactive current instruction of the renewable energy power generation base, and a transmission line impedance, and calculate a transient stability margin value of the system, so as to provide a basis for quantitative evaluation of transient stability of the renewable energy power generation base.
The technical scheme of the invention is realized as follows:
a transient stability margin evaluation method suitable for a renewable energy power generation base in a low voltage ride through period is used for judging the transient stability of a double-fed induction wind power grid-connected system, an inverter type wind power grid-connected system and a photovoltaic power generation grid-connected system under the condition of a power grid short circuit fault and quantitatively evaluating the transient stability margin of the double-fed induction wind power grid-connected system, the inverter type wind power grid-connected system and the photovoltaic power generation grid-; the method is characterized in that: the specific evaluation steps are as follows;
A1) the renewable energy power generation base during the fault period adopts a grid voltage d-axis orientation mode to acquire the voltage amplitude value | U of the grid fault pointfThe total active current instruction injected into the grid-connected point by the renewable energy power generation base is
Figure GDA0002731344150000021
And a total reactive current command of
Figure GDA0002731344150000022
A2) Subjecting the product obtained in step A1)
Figure GDA0002731344150000023
And
Figure GDA0002731344150000024
calculating a total current instruction I injected into a grid-connected point by the renewable energy power generation base according to the following formula*Command current angle thetaI*And transmission line impedance angle thetaZ：
Figure GDA0002731344150000025
Wherein, X and R are equivalent inductive reactance and resistance of a transmission line from a grid-connected point to a fault point respectively;
A3) subjecting the | U obtained in the step A1)fI obtained in step A2)*、θI*And thetaZThe transient instability boundary A is calculated as followsmax：
Figure GDA0002731344150000026
Wherein, Z is the impedance of the transmission line from the point-to-fault, and Z is R + jX;
A4) subjecting A obtained in step A3)maxAnd quantitatively calculating the transient stability margin of the renewable energy power generation base during the fault according to the following formula:
Figure GDA0002731344150000027
the MTVA value is an evaluation value of transient stability margin of the renewable energy power generation base during a fault period, and the larger the MTVA value is, the larger the transient stability margin of the system is, and the smaller the instability risk is;
A5) the method is used as a criterion for transient instability of the renewable energy power generation base during a fault according to the following formula:
Figure GDA0002731344150000028
compared with the prior art, the invention has the following beneficial effects:
the method can judge whether the system has transient instability or not according to the voltage drop degree of the power grid, the active and reactive current instruction of the renewable energy power generation base and the impedance of the power transmission line, and calculate the transient stability margin value of the system, can be used for transient instability criterion of a double-fed induction wind power grid-connected system, an inverter type wind power grid-connected system (such as a permanent magnet direct-drive wind power system) and a photovoltaic power generation grid-connected system under the short-circuit fault of the power grid, and quantitatively evaluate the transient stability margin thereof, and provides guiding suggestions for the development, planning, construction and scheduling instructions of the power grid of renewable energy.
Drawings
Fig. 1 is a schematic structural diagram of a doubly-fed induction wind farm access power system.
Fig. 2 is a simulation waveform diagram of the doubly-fed wind power base when the grid voltage drops to 20% and the MTVA is-0.2 °.
Fig. 3 is a simulation waveform diagram of the doubly-fed wind power base when the grid voltage drops to 20% and the MTVA is 28.2 °.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Taking a doubly-fed wind farm as an example, fig. 1 is a schematic structural diagram of a 200MVA doubly-fed wind power system accessing to a power system.
The invention discloses a transient stability margin evaluation method suitable for a renewable energy power generation base in a low-voltage ride through period, which is used for judging the transient stability of a double-fed induction wind power grid-connected system, an inverter type wind power grid-connected system and a photovoltaic power generation grid-connected system under the condition of a power grid short-circuit fault and quantitatively evaluating the transient stability margin of the double-fed induction wind power grid-connected system, the inverter type wind power grid-connected system and the. The evaluation method comprehensively considers the transient voltage stability and the transient power angle stability, and comprises the following specific evaluation steps;
A1) the renewable energy power generation base during the fault period adopts a grid voltage d-axis orientation mode to acquire the voltage amplitude value | U of the grid fault pointfThe total active current instruction injected into a point of connection (PCC) by a renewable energy power generation base is
Figure GDA0002731344150000031
And a total reactive current command of
Figure GDA0002731344150000032
A2) Subjecting the product obtained in step A1)
Figure GDA0002731344150000033
And
Figure GDA0002731344150000034
calculating renewable energy according to the following formulaTotal current instruction I injected into PCC (point of common coupling) by an electric base*Angle of command current
Figure GDA0002731344150000035
And transmission line impedance angle thetaZ：
Figure GDA0002731344150000036
Wherein, X and R are equivalent inductive reactance and resistance from the PCC to the transmission line of the fault point respectively;
A3) subjecting the | U obtained in the step A1)fAnd I obtained in step A2)*、
Figure GDA0002731344150000037
And thetaZThe transient instability boundary A is calculated as followsmax：
Figure GDA0002731344150000041
Wherein, Z is the impedance of the transmission line from the point-to-fault, and Z is R + jX;
A4) subjecting A obtained in step A3)maxAnd quantitatively calculating the transient stability margin of the renewable energy power generation base during the fault according to the following formula:
Figure GDA0002731344150000042
the MTVA value is an evaluation value of transient stability margin of the renewable energy power generation base during a fault period, and the larger the MTVA value is, the larger the transient stability margin of the system is, and the smaller the instability risk is;
A5) the method is used as a criterion for transient instability of the renewable energy power generation base during a fault according to the following formula:
Figure GDA0002731344150000043
description of the effects of the invention:
fig. 2 and fig. 3 respectively show simulated waveform comparison diagrams of the doubly-fed wind power base when the grid voltage drops to 20%, the MTVA is-0.2 ° and the MTVA is 28.2 °. In the figure, a three-phase short circuit fault occurs in a 0.4s power grid, and 0.5 s-1.1 s are fault duration stages, and as can be seen from figure 2, when the MTVA is less than 0, transient instability occurs in a double-fed wind power base, and the safe and stable operation capability of the power grid is seriously threatened. As can be seen from FIG. 3, when the MTVA is greater than 0, the system is in a transient stable operation region and has a transient stable margin of 28.2 degrees, and the doubly-fed wind power base can realize safe and stable operation during low voltage ride through.
In conclusion, the transient stability margin evaluation method applicable to the renewable energy power generation base in the low voltage ride through period can be used as a transient instability criterion of the renewable energy power generation base under the grid fault, and can quantitatively measure the transient stability margin.
Finally, it should be noted that the above-mentioned examples of the present invention are only examples for illustrating the present invention, and are not intended to limit the embodiments of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, it will be apparent to those skilled in the art that other variations and modifications can be made based on the above description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.

Claims (1)

1. A transient stability margin evaluation method suitable for a renewable energy power generation base in a low voltage ride through period is used for judging the transient stability of a double-fed induction wind power grid-connected system, an inverter type wind power grid-connected system and a photovoltaic power generation grid-connected system under the condition of a power grid short circuit fault and quantitatively evaluating the transient stability margin of the double-fed induction wind power grid-connected system, the inverter type wind power grid-connected system and the photovoltaic power generation grid-; the method is characterized in that: the specific evaluation steps are as follows;
A1) the renewable energy power generation base during the fault period adopts a grid voltage d-axis orientation mode to acquire the voltage amplitude value | U of the grid fault pointfThe total active current instruction injected into the grid-connected point by the renewable energy power generation base is
Figure FDA0002159213300000011
And a total reactive current command of
Figure FDA0002159213300000012
A2) Subjecting the product obtained in step A1)
Figure FDA0002159213300000013
And
Figure FDA0002159213300000014
calculating a total current instruction I injected into a grid-connected point by the renewable energy power generation base according to the following formula*Angle of command current
Figure FDA0002159213300000015
And transmission line impedance angle thetaZ：
Figure FDA0002159213300000016
Wherein, X and R are equivalent inductive reactance and resistance of a transmission line from a grid-connected point to a fault point respectively;
A3) subjecting the | U obtained in the step A1)fI obtained in step A2)*、
Figure FDA0002159213300000017
And thetaZThe transient instability boundary A is calculated as followsmax：
Figure FDA0002159213300000018
Wherein, Z is the impedance of the transmission line from the point-to-fault, and Z is R + jX;
A4) will step A3)Obtained AmaxAnd quantitatively calculating the transient stability margin of the renewable energy power generation base during the fault according to the following formula:
Figure FDA0002159213300000019
the MTVA value is an evaluation value of transient stability margin of the renewable energy power generation base during a fault period, and the larger the MTVA value is, the larger the transient stability margin of the system is, and the smaller the instability risk is;
A5) the method is used as a criterion for transient instability of the renewable energy power generation base during a fault according to the following formula:
Figure FDA00021592133000000110
CN201910726872.9A 2019-08-07 2019-08-07 Transient stability margin evaluation method for renewable energy power generation base Active CN110311415B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910726872.9A CN110311415B (en) 2019-08-07 2019-08-07 Transient stability margin evaluation method for renewable energy power generation base

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910726872.9A CN110311415B (en) 2019-08-07 2019-08-07 Transient stability margin evaluation method for renewable energy power generation base

Publications (2)

Publication Number Publication Date
CN110311415A CN110311415A (en) 2019-10-08
CN110311415B true CN110311415B (en) 2021-02-19

Family

ID=68082084

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910726872.9A Active CN110311415B (en) 2019-08-07 2019-08-07 Transient stability margin evaluation method for renewable energy power generation base

Country Status (1)

Country Link
CN (1) CN110311415B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111146809B (en) * 2020-01-19 2023-03-24 重庆大学 Grid-connected inverter transient stability control method based on improved phase-locked loop
CN113193598B (en) * 2021-05-31 2022-09-30 重庆大学 New energy grid-connected inverter transient stability margin evaluation method
CN115663881B (en) * 2022-09-07 2024-04-30 国网重庆市电力公司电力科学研究院 Current control method for power system under symmetrical short-circuit fault of alternating-current power grid

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102682358B (en) * 2012-03-30 2016-08-10 中国电力科学研究院 A kind of assessment wind-electricity integration scale and Net Frame of Electric Network adaptive planning simulation method
CN104124705B (en) * 2014-07-15 2016-09-21 国家电网公司 Wind-powered electricity generation transient response scheme optimization method based on wind-electricity integration system stability characteristic
CN108258714B (en) * 2018-01-19 2021-06-04 国电南瑞科技股份有限公司 Power grid starting mode optimization method

Also Published As

Publication number Publication date
CN110311415A (en) 2019-10-08

Similar Documents

Publication Publication Date Title
CN110311415B (en) Transient stability margin evaluation method for renewable energy power generation base
Li et al. Transient voltage control of sending-end wind farm using a synchronous condenser under commutation failure of HVDC transmission system
CN112217236A (en) Virtual impedance control method for double-fed wind power grid-connected system under asymmetric fault
Li et al. Modeling of large wind farm systems for dynamic and harmonics analysis
CN110417059B (en) Transient stability control method for renewable energy power generation base
CN103701389A (en) Method for identifying parameters of controllers of DFIG (doubly-fed induction generator)
CN110707728B (en) Subsynchronous oscillation suppression method based on subsynchronous oscillation short-circuit ratio index
CN106897514B (en) Method for establishing short-circuit current calculation model of full-power conversion type new energy station
CN113517715A (en) Wind power generation grid-connected system transient stability control method based on automatic current adjustment
CN102427228B (en) Wind power generation system reliability estimating method considering voltage drop of power grid
CN116629016A (en) Wind farm short-circuit current simulation method based on permanent magnet direct-driven fan simplified model
Li et al. Wind farm electromagnetic dynamic model and outgoing line protection relay RTDS testing
Li et al. Construction and equivalence of single-machine model of renewable energy for large-scale power system simulation
Shen et al. Modeling and Parameter Identification of the Photovoltaic Inverter based on VSG
CN106972510B (en) Directly driven wind-powered sub-synchronous oscillation analysis method based on the delay of net side control loop
Chu et al. Sequence impedance modeling of DFIG wind farm via LCC-HVDC Transmission
Shenghai et al. Research on the impact of voltage stability of power system with the direct drive wind farm
Shi et al. Integrated analysis and monitoring for large-scale wind farm connected with large capacity thermal power plant
CN116470522B (en) Control parameter identification method and device for SVG universal electromagnetic transient model
Xu et al. An amplitude comparison protection for distribution networks with high permeability inverter-interfaced distributed generations
CN114914915B (en) DFIG converter control method with negative sequence active compensation capability
Wang et al. Sequence Impedance Modeling of DFIG Wind Farm Via LCC-HVDC Transmission
Wang et al. Analysis of subsynchronous oscillation characteristics of hybrid-based wind farm connected with fixed series compensation system
Zhang et al. Investigation of Sub-synchronous Oscillation in HVDC-connected PMSG-based Offshore Wind Farm: Comprehensive Modeling and Analysis
Li et al. Unified Modeling of External Characteristics for Multi-Type Reactive Power Sources Under Short-Circuit Faults

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant