CN107425542B - The control method of DFIG reactive power compensation in low voltage failure crossing process - Google Patents

The control method of DFIG reactive power compensation in low voltage failure crossing process Download PDF

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CN107425542B
CN107425542B CN201710518804.4A CN201710518804A CN107425542B CN 107425542 B CN107425542 B CN 107425542B CN 201710518804 A CN201710518804 A CN 201710518804A CN 107425542 B CN107425542 B CN 107425542B
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reactive power
dfig
voltage
power
stator side
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CN107425542A (en
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李岚
贺惟明
王宇龙
叶吉亮
王浩
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Taiyuan University of Technology
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    • H02J3/386—
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The present invention relates to wind power generation fields, the control method of DFIG reactive power compensation, the switching including network voltage detection and DFIG control strategy specially in low voltage failure crossing process.Pass through the real-time detection to network voltage, when judging that voltage falls failure, the unity power factor control strategy of DFIG rotor-side converter is switched to the control strategy of reactive power output, to provide reactive power support to network voltage to help network voltage to restore.The method of the invention is without increasing additional reactive power compensator, utilize the switching of unit itself control strategy, the output that stator side reactive power is adjusted during failure is supported, to provide reactive current to power grid, fall degree with improve network voltage, enhances the low voltage failure ride-through capability of entire wind generator system.

Description

The control method of DFIG reactive power compensation in low voltage failure crossing process
Technical field
The present invention relates to wind power generation fields, the control of DFIG reactive power compensation specially in low voltage failure crossing process Method processed.
Technical background
In recent years, with the swift and violent growth of global energy wear rate, as a kind of cleaning, unlimited renewable energy, Wind energy gets more and more people's extensive concerning.And double-fed generator (DFIG) is used as mainstream model therein, because its wind energy utilization is high, The features such as required converter capacity is small, is quickly become the research hotspot and developing direction of wind power generation field.
However, rising year by year with wind-driven generator installed capacity, large-scale wind power is connected to the grid will be to power train Regiment commander greatly challenges.When power grid failure leads to Voltage Drop, it will influence the normal fortune of dual feedback wind power generation system Row, or even there is off line phenomenon.Therefore, wind generator system must have certain low voltage failure ride-through capability.
In the trend of electric system, the flow direction of reactive power is related to the amplitude size of network voltage.Therefore in power grid After Low Dropout failure occurs, reactive power is reasonably injected into power grid will be helpful to the recovery of faulty grid voltage.Mesh Before, main literature and research concentrate on using reactive power compensation device support failure in network voltage recovery, as SVC, The reactive power compensators such as STATCOM and shunt capacitor.The application of reactive power compensator can rapidly provide idle for wind power plant Support, facilitates the recovery of network voltage, improves the transient stability of system, improve its low voltage failure ride-through capability.So And additional increased reactive power compensation device is by the manufacturing cost for the system that will increase, and needs to consider the installation operation of device And its control in a fault situation.
Summary of the invention
The purpose of the present invention is mainly that the reactive power of double-fed fan motor unit itself is utilized to export control ability, is fallen in voltage The switching in failure by control strategy is fallen, the control compensated using DFIG itself output reactive power restores electricity to help Net voltage.
The technical solution adopted by the present invention is that: the controlling party of DFIG reactive power compensation in low voltage failure crossing process Method, comprising the following steps:
S1: detection network voltage, and the network voltage of detection is judged；
S2: when network voltage is more than or equal to the 0.9pu of voltage rating and is less than 1.0pu, being judged as that network voltage is normal, Reactive power reference qref Q is set at this timeref1=0, DFIG rotor-side converter keep unity power factor fortune when operating normally Row；
S3: when network voltage is less than 0.9pu and is greater than 0pu, it is judged as voltage failure, DFIG rotor-side converter exports nothing Function power sets reactive power reference qref Qref2, reactive power reference qref Q at this timeref2It is wanted according to the test of DFIG low voltage failure It asks and the setting of reactive power clipping is given, reactive power reference qref Qref2It is calculated by following steps:
S31: it can be stated by the reactive current that test request DFIG is provided to power grid are as follows: Iq=1.5 (0.9-Ug/UN)IqN 0.2≤Ug≤0.9；Wherein UgFor the amplitude of network voltage, UNFor power grid voltage rating, IqNFor stator side under specified operating status The reactive current that can be issued；
S32: during failure, it is desirable that the reactive power of DFIG stator side output may be expressed as:Wherein, QNFor the reactive power rated value of DFIG stator side output；
S33: with grid voltage orientation, the electric current dq component of rotor current transformer isWherein, ird, irqThe respectively electric current dq component of rotor current transformer；Ps、QsRespectively The active power and reactive power issued for DFIG stator side；Ls、LmFor the mutual inductance between stator winding inductance and Stator and Rotor Windings, ω1For synchronous angular velocity；
S34: the active-power P that stator side issuessAnd reactive power QsRestricted representation by rotor current are as follows:Wherein, irmaxFor the most die of rotor during failure Hinder electric current；Arrangement obtainsWherein, Xs=ω1Ls, Xm=ω1Lm；
S35: wind speed gives under situation, the active-power P that stator side issuessCentainly, the reactive power Q that stator side issuessModel It encloses are as follows: Qsmin≤Qs≤Qsmax, wherein QsminFor the reactive power minimum value that stator side can issue, QsmaxIt can be sent out for stator side Reactive power maximum value out,The reactive power Maximum value QsmaxThe maximum output reactive current of corresponding stator side are as follows:
S36: idle clipping setting are as follows: work as Iq≥Isqmax, reactive power reference qref Qref2It is given as Qsmax；Work as Iq<Isqmax, Reactive power reference qref Qref2It is given as Qq；
S4: given different reactive power Qsref1Or Qref2After the effect of pi regulator, obtaining being capable of separately adjustable stator The rotor voltage component u of side reactive power outputrq, effective control to stator side output reactive power is completed, thus to failure Network voltage in the process carries out restorative adjusting.
The control that DFIG own reactive power compensation is utilized in low voltage failure crossing process of the present invention, passes through unit allocation The switching of strategy, the output that stator side reactive power is adjusted during failure is supported, so that reactive current is provided to power grid, to change Kind network voltage falls degree, enhances the low voltage failure ride-through capability of entire wind generator system.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Fig. 2 is the schematic diagram of controlling tactic switch of the present invention.
Fig. 3 is the reactive power waveform diagram that stator side issues.
Fig. 4 is grid voltage waveform figure.
Waveform correlation when what dotted line indicated in figure is not using control method of the present invention, solid line are indicated using present invention control Waveform correlation when method processed.
Fig. 3 shows in failure process, does not remain essentially as 0 using reactive power when control method of the present invention；And use this Reactive power has output when invention control method.
Fig. 4 shows that after using control method of the present invention, grid side voltage can have a degree of recovery, while can also See, influenced by inherent parameters, the voltage fallen can not be fully returned to the normal value before failure occurs.
Specific embodiment
The control method of DFIG reactive power compensation in low voltage failure crossing process, it is characterised in that including following step It is rapid:
S1: detection network voltage, and the network voltage of detection is judged；
S2: when network voltage is more than or equal to the 0.9pu of voltage rating and is less than 1.0pu, being judged as that network voltage is normal, DFIG rotor-side converter keeps unity power factor operation when operating normally, and sets reactive power reference qref Qref1=0；
S3: when network voltage is less than 0.9pu and is greater than 0pu, it is judged as voltage failure, DFIG rotor-side converter exports nothing Function power sets reactive power reference qref Qref2, reactive power reference qref Q at this timeref2It is wanted according to the test of unit low voltage failure It asks and the setting of reactive power clipping is given.The reactive power reference qref Qref2It is calculated by following steps:
According to the reactive compensation test request of DFIG, network voltage often falls 1% and at least answers during Low Dropout failure 1.5% reactive current is provided.
S31: it can be stated by the reactive current that test request DFIG is provided to power grid are as follows: Iq=1.5 (0.9-Ug/UN)IqN 0.2≤Ug≤0.9(1)；Wherein, IqFor the reactive current provided by test request DFIG to power grid, UgFor the width of network voltage Value, UNFor power grid voltage rating, IqNThe reactive current that can be issued for stator side under specified operating status；
S32: during failure, it is desirable that the reactive power of DFIG stator side output may be expressed as:Wherein, QNFor the reactive power rated value of DFIG stator side output；
The idle clipping setting is the current limit of foundation rotor-side converter to carry out.
S33: with grid voltage orientation, the electric current dq component of rotor current transformer is
Wherein, ird、irqThe respectively dq component of rotor current；Ps、QsThe respectively active power and nothing of DFIG stator side sending Function power；Ls, LmFor the mutual inductance between stator winding inductance and Stator and Rotor Windings, ω1For synchronous angular velocity；
S34: the active-power P that the stator side issuessAnd reactive power QsMainly by the restricted representation of rotor current Are as follows:
Wherein, irmaxFor the maximum fault current of rotor during failure, it is traditionally arranged to be 2 times of rotor rated current；It can arrange It obtains
Wherein, Xs=ω1Ls, Xm=ω1Lm；
S35: wind speed gives under situation, the active-power P that stator side issuessCentainly.The reactive power Q that stator side issuessModel It encloses are as follows: Qsmin≤Qs≤Qsmax, wherein QsminFor the reactive power minimum value that stator side can issue, QsmaxIt can be sent out for stator side Reactive power maximum value out, and:The reactive power Maximum value corresponds to the maximum output reactive current of stator side are as follows:
S36: the idle clipping setting are as follows: work as Iq≥Isqmax, reactive power reference qref Qref2It is given as Qsmax；Work as Iq< Isqmax, reactive power reference qref Qref2It is given as Qq；
S4: given different reactive power Qsref1Or Qref2After the effect of pi regulator, obtaining being capable of separately adjustable stator The rotor voltage component urq of side reactive power output, completes effective control to stator side output reactive power, thus to failure Network voltage in the process carries out restorative adjusting.
The present invention is further illustrated combined with specific embodiments below.The present embodiment provides a kind of network voltage is symmetrical Fall the control method of DFIG reactive power compensation in failure process, specific application environment be based on software Matlab/ Smulink verifies control method described in foregoing invention, to help to restore the network voltage in failure.It is chosen in emulation In t=4.0s situation when symmetrically dropping to voltage rating 50% occurs for network voltage.Specific implementation step is as follows:
1. detecting network voltage, and the voltage of detection is judged.When network voltage is more than or equal to voltage rating 0.9pu and be less than 1.0pu when, be judged as that voltage is normal；As t=4.0s, network voltage is less than 0.9pu and is greater than 0pu, judgement For voltage failure.
2. being switched over according to detection and its judging result to the control strategy of DFIG rotor-side converter.When judgement is positive Chang Shi, is switched to a, and rotor-side converter (RSC) keeps unity power factor operation when operating normally；When being judged as failure When, it is switched to b, RSC controls output reactive power, and answers according to the requirement that test request at this time is arranged with reactive power clipping I is providedqThe reactive current of=0.6pu runs for non-unity power factor factor.
3. meanwhile according to DFIG rotor-side converter controlling tactic switch as a result, giving different reactive power references Value Qref1And Qref2.Wherein, Qref1The requirement for meeting unity power factor operation, is given as 0；Qref2According to the event of unit low-voltage The requirement of test request and reactive power the clipping setting of barrier is given as Qq=0.45pu.
4. given different reactive powers are after the effect of pi regulator, obtaining being capable of separately adjustable stator side reactive power The rotor voltage component u of outputrq, effective control to stator side output reactive power is completed, thus to the electricity in failure process Net voltage carries out restorative adjusting.

Claims (1)

1. the control method of DFIG reactive power compensation in low voltage failure crossing process, it is characterised in that the following steps are included:
S1: detection network voltage, and the network voltage of detection is judged；
S2: when network voltage is more than or equal to the 0.9pu of voltage rating and is less than 1.0pu, it is judged as that network voltage is normal, at this time Set reactive power reference qref Qref1=0, DFIG rotor-side converter keep unity power factor operation when operating normally；
S3: when network voltage is less than 0.9pu and is greater than 0pu, it is judged as voltage failure, DFIG rotor-side converter exports idle function Rate sets reactive power reference qref Qref2, reactive power reference qref Q at this timeref2According to DFIG low voltage failure test request and The setting of reactive power clipping is given, reactive power reference qref Qref2It is calculated by following steps:
S31: it is stated by the reactive current that test request DFIG is provided to power grid are as follows: Iq=1.5 (0.9-Ug/UN)IqN 0.2≤Ug ≤0.9；Wherein UgFor the amplitude of network voltage, UNFor power grid voltage rating, IqNIt can be sent out for stator side under specified operating status Reactive current out；
S32: during failure, it is desirable that the reactive power of DFIG stator side output is expressed as:Wherein, QNFor the reactive power rated value of DFIG stator side output；
S33: with grid voltage orientation, the electric current dq component of rotor current transformer isIts In, ird, irqThe respectively electric current dq component of rotor current transformer；Ps、QsThe respectively active power and nothing of DFIG stator side sending Function power；Ls、LmFor the mutual inductance between stator winding inductance and Stator and Rotor Windings, ω1For synchronous angular velocity；
S34: the active-power P that stator side issuessAnd reactive power QsRestricted representation by rotor current are as follows:Wherein, irmaxFor the most die of rotor during failure Hinder electric current；Arrangement obtainsWherein, Xs=ω1Ls, Xm=ω1Lm；
S35: wind speed gives under situation, the active-power P that stator side issuessCentainly, the reactive power Q that stator side issuessRange Are as follows: Qsmin≤Qs≤Qsmax, wherein QsminFor the reactive power minimum value that stator side can issue, QsmaxIt can be issued for stator side Reactive power maximum value,The reactive power is most Big value QsmaxThe maximum output reactive current of corresponding stator side are as follows:
S36: idle clipping setting are as follows: work as Iq≥Isqmax, reactive power reference qref Qref2It is given as Qsmax；Work as Iq<Isqmax, idle Value and power reference Qref2It is given as Qq；
S4: given different reactive power reference qref Qref1Or Qref2After the effect of pi regulator, obtaining can be separately adjustable fixed The rotor voltage component u of sub- side reactive power outputrq, effective control to stator side output reactive power is completed, thus to event Network voltage during barrier carries out restorative adjusting.
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CN110136269B (en) * 2019-05-09 2022-09-23 安徽工程大学 Fall test visual virtual reality system based on normal self-correction
CN111668853B (en) * 2020-05-12 2020-12-11 南方电网能源发展研究院有限责任公司 STATCOM-involved capacitive reactive compensation configuration method and system for receiving-end converter station
CN113141024B (en) * 2021-04-22 2022-08-02 太原理工大学 DFIG rotor side converter fault ride-through control method adopting additional compensation term
CN114256883B (en) * 2021-11-25 2023-10-03 中国华能集团清洁能源技术研究院有限公司 Control method and device of doubly-fed wind turbine generator and electronic equipment

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