[go: up one dir, main page]

CN110912154A - An adaptive phase-locked oscillator control method - Google Patents

An adaptive phase-locked oscillator control method Download PDF

Info

Publication number
CN110912154A
CN110912154A CN201911139911.1A CN201911139911A CN110912154A CN 110912154 A CN110912154 A CN 110912154A CN 201911139911 A CN201911139911 A CN 201911139911A CN 110912154 A CN110912154 A CN 110912154A
Authority
CN
China
Prior art keywords
phase
locked oscillator
control method
commutation
voltage
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.)
Granted
Application number
CN201911139911.1A
Other languages
Chinese (zh)
Other versions
CN110912154B (en
Inventor
吴跨宇
周永智
吴浩
沈轶君
熊鸿韬
卢嘉华
楼伯良
华文
张建承
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.)
Zhejiang University ZJU
Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
Zhejiang University ZJU
Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
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 Zhejiang University ZJU, Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd filed Critical Zhejiang University ZJU
Priority to CN201911139911.1A priority Critical patent/CN110912154B/en
Publication of CN110912154A publication Critical patent/CN110912154A/en
Application granted granted Critical
Publication of CN110912154B publication Critical patent/CN110912154B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02J3/36—Arrangements for transfer of electric power between AC networks via a high-tension DC link
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

本发明公开了一种自适应锁相振荡器控制方法。本发明采用的技术方案包括：步骤一，根据交流侧换相电压判断系统是否处于大扰动状态；步骤二，根据当前换相电压及锁相振荡器的输出，计算相位修正量；步骤三，相位修正量经过PI控制器后得到最新的相位输出，其中PI控制器的参数根据步骤一中所判定的系统状态确定。本发明在正常运行期间，保证系统的小干扰稳定性；在直流系统故障恢复期间，提高锁相振荡器捕捉电压相位的能力。本发明对防止直流故障恢复期间锁相振荡器输出误差所引起的后续换相失败故障有着明显的抑制作用。

Figure 201911139911

The invention discloses an adaptive phase-locked oscillator control method. The technical scheme adopted by the present invention includes: step 1, judging whether the system is in a large disturbance state according to the commutation voltage of the AC side; step 2, calculating the phase correction amount according to the current commutation voltage and the output of the phase-locked oscillator; step 3, the phase After the correction amount passes through the PI controller, the latest phase output is obtained, wherein the parameters of the PI controller are determined according to the system state determined in step 1. The invention ensures the stability of the small disturbance of the system during normal operation, and improves the ability of the phase-locked oscillator to capture the voltage phase during the fault recovery period of the DC system. The invention has obvious inhibitory effect on preventing the subsequent commutation failure failure caused by the output error of the phase-locked oscillator during the recovery of the DC fault.

Figure 201911139911

Description

Control method of self-adaptive phase-locked oscillator
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a control method of a self-adaptive phase-locked oscillator for improving the recovery capability of direct-current transmission commutation failure.
Background
In actual operation, the alternating current-direct current hybrid system has multiple failures of single-circuit direct current continuous phase commutation or multiple-circuit direct current simultaneous phase commutation caused by alternating current system faults. The problems of direct current power transmission interruption, overheating of a converter valve, transformer magnetic biasing, relay protection misoperation and the like can be caused by a phase-change failure fault; meanwhile, according to the current extra-high voltage direct current control protection strategy, direct current blocking may be caused when multiple continuous commutation failures occur. If the multiple high-power direct currents are lost simultaneously, the receiving end system has the risk of system frequency breakdown, large-area power failure can be caused, and adverse effects are generated on social stability and economic development.
A plurality of direct current blocking accidents occur in the operation of a direct current transmission system, and the recovery control of the commutation failure fault of the direct current system is very important for improving the safety and stability of the system.
Disclosure of Invention
The present invention aims to provide a method for controlling an adaptive phase-locked oscillator, which improves the recovery capability of the commutation failure of the dc power transmission, in view of the above-mentioned deficiencies of the prior art.
Therefore, the invention adopts the following technical scheme: a method of adaptive phase-locked oscillator control, comprising:
judging whether a receiving end alternating current system is in a large disturbance state according to alternating current side commutation voltage;
calculating phase correction according to the current commutation voltage and the output of a phase-locked oscillator;
and step three, obtaining the latest phase output after the phase correction quantity passes through the PI controller, wherein the parameters of the PI controller are determined according to the state of the receiving end alternating current system determined in the step one.
Further, in the step one, the amplitude and the voltage change rate of the phase-change voltage are calculated as follows:
Urms＝RMS(ua,ub,uc)
in the formula: u shapermsIs the amplitude of the commutation voltage; RMS (u)a,ub,uc) Calculating a function for the amplitude; u. ofa,ub,ucA, B, C-phase instantaneous values of the alternating-current-side phase-change voltage respectively;
then, the rate of change of the commutation voltage is:
Figure BDA0002280624660000021
further, in the first step, the large disturbance state determination formula is as follows:
Figure BDA0002280624660000022
in the formula: delta is the running state of direct current, and 1 represents that the receiving end alternating current system is in a large disturbance state; 0 represents that the receiving end alternating current system is in a stable operation state; u shapeconAnd (4) determining a value for the change rate of the phase-changing voltage of the receiving end alternating current system.
Further, the specific content of the step two is as follows:
calculating u from abc/αβ transformationαAnd uβ：
Figure BDA0002280624660000023
In the formula: u. ofαAnd uβIs αβ -phase change electricity under coordinate axisPressing;
calculating a phase correction amount:
Figure BDA0002280624660000024
in the formula: thetaerrIs the phase correction amount; thetaPLOA value is output for the current phase.
Further, in step three, the model of the PI controller is:
Figure BDA0002280624660000031
in the formula: kIAnd KPThe integral link and the proportional link coefficients of the PI controller are obtained; thetatmpOutputting a value for an integral link; omega0Is the receiving end alternating current system power frequency;
Figure BDA0002280624660000032
expressing the change rate of the output value of the integration link and the phase output value;
wherein, KIAnd KPAnd (3) dynamically adjusting the value according to the delta in the step one:
Figure BDA0002280624660000033
Figure BDA0002280624660000034
in general, KI,1>KI,0，KP,1>KP,0。
Furthermore, in step three, during the phase commutation failure recovery period, higher proportional and integral control parameters are set for providing better phase tracking capability; during steady state operation, the value of the control parameter is appropriately reduced for improving the small disturbance stability of the receiving end alternating current system.
The invention has the following beneficial effects:
the invention provides a self-adaptive phase-locked oscillator control method considering that the voltage phase change in the recovery process of a direct current system can cause the deviation between the actual trigger angle of the direct current system and the instruction value, and can select control parameters according to the state of the system. During normal operation, the small interference stability of the system is ensured;
the ability of the phase-locked oscillator to capture the voltage phase is improved during fault recovery of the dc system. The invention has obvious inhibiting effect on preventing subsequent commutation failure fault caused by output error of the phase-locked oscillator during the recovery period of the direct current fault. The improvement of the fault recovery capability of the direct current system has important significance for the safe and stable operation of the alternating current and direct current system.
Drawings
Fig. 1 is a schematic diagram of a phase-locked oscillator and a trigger angle generation relationship of a conventional direct-current power transmission system;
FIG. 2 is a schematic diagram of a control strategy according to the present invention;
FIG. 3 is a diagram comparing the firing angle command and the actual firing angle during commutation failure recovery without the addition of the present invention;
FIG. 4 is a diagram comparing the firing angle command and the actual firing angle in the commutation failure recovery process after the present invention is added.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the receiving-end system converter station generates a firing angle instruction of the converter valve through a plurality of control links such as a power control link and a low-voltage current-limiting control link according to a power instruction, a direct-current voltage, a direct current and a commutation voltage value. After the trigger angle control command is compared with the alternating-current side voltage phase information output by the phase-locked oscillator, the trigger pulse generator generates a pulse signal for triggering the gate pole. In the invention, whether the receiving end alternating current system is in a large disturbance state is judged according to the voltage amplitude value change rate of the alternating current system, and the control parameter of the phase-locked oscillator is determined according to the state, as shown in figure 2.
Firstly, judging whether a receiving end alternating current system is in a large disturbance state or not according to alternating current side phase change voltage, and calculating phase change voltage amplitude and voltage change rate:
Urms＝RMS(ua,ub,uc)
in the formula: u shapermsIs the amplitude of the commutation voltage; RMS (u)a,ub,uc) Calculating a function for the amplitude; u. ofa,ub,ucThe instantaneous values of the A, B, C phases of the ac-side commutated phase voltage are each.
Then, the rate of change of the commutation voltage is
Figure BDA0002280624660000041
The basis for judging the large disturbance state is as follows:
Figure BDA0002280624660000042
in the formula: delta is the direct current running state (1 represents that the receiving end alternating current system is in a large disturbance state, and 0 represents that the receiving end alternating current system is in a stable running state); u shapeconAnd (4) determining a value for the change rate of the phase-changing voltage of the receiving end alternating current system.
And for the phase capturing link, calculating the correction quantity of the phase output according to the current commutation voltage and the output of the phase-locked oscillator. The method comprises the following steps:
1. calculating u from abc/αβ transformationαAnd uβ：
Figure BDA0002280624660000051
In the formula: u. ofαAnd uβIs αβ -commutation voltage in the coordinate axis.
2. Calculating a phase correction amount:
Figure BDA0002280624660000052
in the formula: thetaerrIs the phase correction amount; thetaPLOA value is output for the current phase.
And finally, obtaining the latest phase output after the phase correction quantity passes through a PI controller, wherein the parameters of the PI controller are determined according to the state of the receiving end alternating current system determined in the step one. The method comprises the following steps:
the model of the PI controller is:
Figure BDA0002280624660000053
in the formula: kIAnd KPThe integral link and the proportional link coefficients of the PI controller are obtained; thetatmpOutputting a value for an integral link; omega0Is the receiving end alternating current system power frequency.
Wherein, KIAnd KPAnd (3) dynamically adjusting the value according to the delta in the step one:
Figure BDA0002280624660000054
Figure BDA0002280624660000061
in general, KI,1>KI,0KP,1>KP,0. Higher proportional and integral control parameters may provide better phase tracking capability during commutation failure recovery. During steady state operation, the value of the control parameter is properly reduced, and the small interference stability of the receiving end alternating current system can be improved.
Taking a standard test model in CIGRE as an example, before the present invention is added, when a receiving end system has a short circuit fault and a commutation failure occurs, a comparison between a trigger angle instruction and an actual trigger angle is shown in fig. 3. It can be seen that the trigger pulse generated by the control command of the polarization control layer deviates from the expected one due to the deviation of the output of the phase-locked oscillator from the actual voltage phase, especially during fault recovery, which may result in recovery failure. A comparison of firing angle commands with actual firing angles after the present invention has been incorporated is shown in fig. 4. It can be seen that after the dynamic self-adaptive control parameters are adopted, the phase-locked oscillator can keep good phase tracking capability under large disturbance, and the control precision of the trigger pulse is improved during the fault recovery period.

Claims (6)

1.一种自适应锁相振荡器控制方法，其特征在于，包括：1. an adaptive phase-locked oscillator control method, is characterized in that, comprises: 步骤一，根据交流侧换相电压判断受端交流系统是否处于大扰动状态；Step 1, according to the commutation voltage of the AC side, determine whether the AC system at the receiving end is in a state of large disturbance; 步骤二，根据当前换相电压及锁相振荡器的输出，计算相位修正量；Step 2: Calculate the phase correction amount according to the current commutation voltage and the output of the phase-locked oscillator; 步骤三，相位修正量经过PI控制器后得到最新的相位输出，其中PI控制器的参数根据步骤一中所判定的受端交流系统状态确定。In step 3, the latest phase output is obtained after the phase correction amount passes through the PI controller, wherein the parameters of the PI controller are determined according to the state of the receiving-end AC system determined in step 1. 2.根据权利要求1所述的一种自适应锁相振荡器控制方法，其特征在于，步骤一中，换相电压幅值及电压变化率计算：2. A kind of adaptive phase-locked oscillator control method according to claim 1, is characterized in that, in step 1, commutation voltage amplitude value and voltage change rate are calculated: Urms＝RMS(ua,ub,uc)U rms =RMS(u a ,u b ,u c ) 式中：Urms为换相电压的幅值；RMS(ua,ub,uc)为幅值计算函数；ua,ub,uc分别为交流侧换相电压的A、B、C相的瞬时值；In the formula: U rms is the amplitude of the commutation voltage; RMS (u a , u b , uc ) is the amplitude calculation function; u a , u b , uc are the A, B , and Instantaneous value of phase C; 然后，换相电压的变化率为Then, the rate of change of the commutation voltage is
Figure FDA0002280624650000011
Figure FDA0002280624650000011
 3.根据权利要求2所述的一种自适应锁相振荡器控制方法，其特征在于，步骤一中，大扰动状态判定公式如下：3. a kind of adaptive phase-locked oscillator control method according to claim 2, is characterized in that, in step 1, large disturbance state determination formula is as follows:
Figure FDA0002280624650000012
Figure FDA0002280624650000012
 式中：δ为直流电流运行状态，1表示受端交流系统处于大扰动状态；0表示受端交流系统处于稳定运行状态；Ucon为受端交流系统状态换相电压变化率判定值。In the formula: δ is the DC current operating state, 1 means that the receiving-end AC system is in a state of large disturbance; 0 means that the receiving-end AC system is in a stable operating state; U con is the judgment value of the commutation voltage change rate of the receiving-end AC system state. 4.根据权利要求2所述的一种自适应锁相振荡器控制方法，其特征在于，步骤二的具体内容如下：4. a kind of adaptive phase-locked oscillator control method according to claim 2, is characterized in that, the concrete content of step 2 is as follows: 根据abc/αβ变换，计算uα和uβ：Calculate u α and u β according to the abc/αβ transformation:
Figure FDA0002280624650000021
Figure FDA0002280624650000021
 式中：uα和uβ为αβ-坐标轴下的换相电压；In the formula: u α and u β are the commutation voltages under the αβ-coordinate axis; 计算相位修正量：Calculate the phase correction amount:
Figure FDA0002280624650000022
Figure FDA0002280624650000022
 式中：θerr为相位修正量；θPLO为当前的相位输出值。In the formula: θ err is the phase correction amount; θ PLO is the current phase output value. 5.根据权利要求4所述的一种自适应锁相振荡器控制方法，其特征在于，步骤三中，PI控制器的模型为：5. a kind of adaptive phase-locked oscillator control method according to claim 4, is characterized in that, in step 3, the model of PI controller is:
Figure FDA0002280624650000023
Figure FDA0002280624650000023
 式中：KI和KP为PI控制器的积分环节和比例环节系数；θtmp为积分环节输出值；ω0为交流系统工频；
Figure FDA0002280624650000024
分别表示积分环节输出值和相位输出值的变化率；In the formula: K I and K P are the integral link and proportional link coefficients of the PI controller; θ tmp is the output value of the integral link; ω 0 is the power frequency of the AC system;
Figure FDA0002280624650000024
respectively represent the rate of change of the output value of the integral link and the phase output value; 其中，KI和KP取值根据步骤一中的δ进行动态调整：Among them, the values of K I and K P are dynamically adjusted according to δ in step 1:
Figure FDA0002280624650000025
Figure FDA0002280624650000025
Figure FDA0002280624650000026
Figure FDA0002280624650000026
 KI,1>KI,0，KP,1>KP,0。K I,1 >K I,0 , K P,1 >K P,0 . 6.根据权利要求5所述的一种自适应锁相振荡器控制方法，其特征在于，步骤三中，在换相失败恢复期间，设定较高的比例及积分控制参数，用于提供更好的相位跟踪能力；在稳态运行期间，适当降低控制参数的值，用于提高受端交流系统的小干扰稳定性。6. An adaptive phase-locked oscillator control method according to claim 5, characterized in that, in step 3, during the commutation failure recovery period, higher proportional and integral control parameters are set to provide more Good phase tracking capability; during steady-state operation, appropriately reduce the value of the control parameters to improve the stability of the receiving-end AC system with small disturbances.
CN201911139911.1A 2019-11-20 2019-11-20 Control method of self-adaptive phase-locked oscillator Active CN110912154B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911139911.1A CN110912154B (en) 2019-11-20 2019-11-20 Control method of self-adaptive phase-locked oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911139911.1A CN110912154B (en) 2019-11-20 2019-11-20 Control method of self-adaptive phase-locked oscillator

Publications (2)

Publication Number Publication Date
CN110912154A true CN110912154A (en) 2020-03-24
CN110912154B CN110912154B (en) 2021-05-14

Family

ID=69818302

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911139911.1A Active CN110912154B (en) 2019-11-20 2019-11-20 Control method of self-adaptive phase-locked oscillator

Country Status (1)

Country Link
CN (1) CN110912154B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4808902A (en) * 1987-05-26 1989-02-28 Kabushiki Kaisha Toshiba Control apparatus for brush-less motor
CN1286530A (en) * 1999-11-12 2001-03-07 深圳市中兴通讯股份有限公司 Method for implementing digital phase-locked loop in clock synchronizing system
CN102931673A (en) * 2012-10-30 2013-02-13 浙江大学 Controller and control method for suppressing commutation failure of direct-current transmission system after alternating-current fault clearing
CN109412191A (en) * 2018-12-05 2019-03-01 华南理工大学 Phase locking method, device and equipment for high-voltage direct-current power transmission system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4808902A (en) * 1987-05-26 1989-02-28 Kabushiki Kaisha Toshiba Control apparatus for brush-less motor
CN1286530A (en) * 1999-11-12 2001-03-07 深圳市中兴通讯股份有限公司 Method for implementing digital phase-locked loop in clock synchronizing system
CN102931673A (en) * 2012-10-30 2013-02-13 浙江大学 Controller and control method for suppressing commutation failure of direct-current transmission system after alternating-current fault clearing
CN109412191A (en) * 2018-12-05 2019-03-01 华南理工大学 Phase locking method, device and equipment for high-voltage direct-current power transmission system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
董明瑞等: "高压直流输电系统换相失败抑制方法", 《电测与仪表》 *

Also Published As

Publication number Publication date
CN110912154B (en) 2021-05-14

Similar Documents

Publication Publication Date Title
CN106887859B (en) A kind of control optimization method and device inhibiting Communication Failure in HVDC Transmission Lines
CN110417042B (en) A safety control method and system for suppressing continuous commutation failure of a DC system
CN110231545B (en) An islanding detection method and reference current extreme value calculation method for AC-DC hybrid grid
CN103730906A (en) Method for coordination control over restraint in mixed direct-current transmission phase-commutation failure
CN112103984B (en) Control method for suppressing continuous commutation failure of hybrid double-infeed DC transmission system
CN107221955B (en) Off-grid smooth switching method of virtual synchronous generator
CN108599224B (en) HVDC continuous commutation failure suppression method based on adaptive current deviation control
CN112968466A (en) Grid-connected inverter transient control method based on power angle estimation
CN108808719A (en) Predictive constant turn-off angle control method
CN110492521A (en) A kind of control method inhibiting Inverter Station commutation failure
CN110061529A (en) The smooth sliding control method of flexible multimode switch
CN106253321B (en) A kind of optimization method of DC control and protection system commutation failure PREDICTIVE CONTROL
CN119783402B (en) HVDC commutation failure risk prediction method considering optimal CFPREV
CN112928938A (en) Virtual reactance-based MMC direct current fault current limiting method
CN104734172B (en) A kind of self-tuning PI control method improving HVDC system suppression commutation failure ability
CN114389297A (en) Commutation failure suppression method and system based on mutual coordination between STATCOM and HVDC predictive control
CN111884210A (en) Commutation failure control method and system under direct current layered access based on harmonic analysis
CN113098045B (en) Optimization control method suitable for UHVDC commutation failure fault recovery
CN105633941A (en) Commutation failure suppression method based on virtual current limiter
CN204761327U (en) Arc extinguishing angle control circuit for improving commutation failure recovery performance of direct current transmission system
CN108616137B (en) An optimization method of DC control and protection parameters for realizing coordinated recovery of AC and DC systems
CN110912154B (en) Control method of self-adaptive phase-locked oscillator
CN119496177A (en) Method and device for predicting continuous commutation failure in LCC-HVDC system
CN109193593A (en) Serial-parallel power grid exchanges the adaptive reclosing time sequence control method of parallel double transmission line on the same tower
CN110266032B (en) Feasible domain description method for HVDC system commutation process

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