CN105186540A - AC/DC dynamic interaction idle work influence scope evaluation method - Google Patents

AC/DC dynamic interaction idle work influence scope evaluation method Download PDF

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Publication number
CN105186540A
CN105186540A CN201510675992.2A CN201510675992A CN105186540A CN 105186540 A CN105186540 A CN 105186540A CN 201510675992 A CN201510675992 A CN 201510675992A CN 105186540 A CN105186540 A CN 105186540A
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direct current
idle
coverage
voltage
current
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CN105186540B (en
Inventor
金小明
张东辉
周保荣
蔡泽祥
田得良
洪潮
杨欢欢
朱林
程兰芬
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South China University of Technology SCUT
Research Institute of Southern Power Grid Co Ltd
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South China University of Technology SCUT
Power Grid Technology Research Center of China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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    • 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

Abstract

The invention discloses an AC/DC dynamic interaction idle work influence scope evaluation method comprising the following steps: 1, simulating calculating a minimum commutation bus voltage value; 2, determining an influence scope on an AC system by AC/DC interaction idle work; 3, evaluating performance. The evaluation combines precise calculation of a jacobian expanding matrix and direct effectiveness of an electromagnetic transient program PSCAD/EMTDC and RTDS, thus fast and accurately determine the influence scope against the AC network by DC system idle work impact; the simple and efficient method can evaluate the dynamic interaction idle work influence scope in the real AC/DC interconnected network, so system operation people can handle and evaluate the influences against the AC system by the DC idle work impact, thus directionally improving AC network voltage support capability, reducing a voltage offset normal value area caused in a DC system fault process, reducing influences against power system loads, and ensuring the AC/DC interconnection network to stably and safely work.

Description

The idle coverage appraisal procedure of a kind of alternating current-direct current dynamic interaction
Technical field
The present invention relates to operation of power networks control technology, more particularly, relate to the idle coverage appraisal procedure of a kind of alternating current-direct current dynamic interaction.
Background technology
Along with development and the application of high pressure and extra-high voltage direct-current transmission technology, under alternating current-direct current interconnected power grid background, the impact of dynamic reactive on whole electrical network Transient Voltage Stability aspect complicated between AC system and direct current system will be especially outstanding, specify the idle coverage to AC of dynamic interaction to ensureing that the safe and stable operation of electrical network is significant.In AC-DC hybrid power grid, total reactive requirement of direct current is very huge, idle the accounting for that direct current system consumes in normal operation carries 40% to 60% of active power, if place breaks down at direct current system change of current bus, the reactive power causing Inverter Station reactive power compensator can not provide enough that sharply declines of voltage, need to draw a large amount of reactive powers from AC network, the dynamic equilibrium of reactive power in electric power networks may be destroyed, finally cause Voltage Instability, material impact is produced to the safe and stable operation of electrical network.
At present, mainly concentrate on about the idle coverage of ac and dc systems dynamic interaction and the load disperseed in a large number is carried out concentrated equivalence to solve, and the method for complete set, system be there is no for the idle coverage assessment of ac and dc systems dynamic interaction.
Summary of the invention
Accurate, a complete characterizing method is had in order to make the idle coverage to AC network of ac and dc systems dynamic interaction, the present invention proposes the mutual idle coverage appraisal procedure of alternating current-direct current emulated based on electro-magnetic transient PSCAD/EMTDC, alternating current-direct current is made to exchange the idle coverage to AC network, degree accurate quantification, sharpness of border, there is generality and versatility, improve the stability that AC-DC interconnecting power network runs.
To achieve these goals, the invention provides the idle coverage appraisal procedure of a kind of alternating current-direct current dynamic interaction, described appraisal procedure comprises the steps,
The minimum change of current bus voltage value of step 1, simulation calculation;
Step 2, determine alternating current-direct current exchange the idle coverage to AC system;
Step 3, performance evaluation.
Further, described step 1 comprises: utilize the electromagnetic transients program such as PSCAD/EMTDC, RTDS, by setting up the detailed model of Ac/dc Power Systems, the change of current bus of a certain direct current system Inverter Station emulates the most serious three-phase metallic earthing fault, calculates and make direct current system drop point place's change of current bus minimum amount of voltage that.
Further, described step 2 comprises: after direct current system Inverter Station change of current busbar fault, with the electrical distance of distance direct current drop point for standard, carries out traverse scanning to the interchange node busbar voltage near direct current drop point, motor speed-torque characteristics; Equal at initial value when certain exchanges node busbar voltage effective value, this Nodes can be thought at this moment on the idle border on AC network impact of alternating current-direct current dynamic interaction; Near direct current system drop point place within these exchange node, namely it is that alternating current-direct current exchanges the idle coverage to AC network that the busbar voltage effective value exchanging node is less than in initial value region, region beyond this node not can be thought and exchanges idle impact by alternating current-direct current, thus can determine that alternating current-direct current exchanges the idle coverage to AC system.
Further, described step 3 comprises: by the voltage-drop situation of each node of AC network beyond the relatively above idle reciprocal effect scope of alternating current-direct current drawn, notional result is that all nodes outside coverage there will not be voltage deviation normal value situation, may have node voltage within scope lower than normal value, the situations such as induction-motor load reduction of speed occur; Based on this standard, can make an appraisal to the appraisal procedure reliability of the idle coverage of this ac and dc systems dynamic interaction.
In AC-DC interconnecting power network, when direct current system change of current bus place breaks down (through experimental verification, situation the most serious is three-phase metallic earthing), cause Inverter Station in-place reactive power compensation device to provide idle that sharply decline of voltage greatly reduces, for capacitor compensation the most common, its reactive power that can provide and its both end voltage meet following relation:
Q = U 2 C - - - ( 1 )
Therefore, the reactive power that capacitor can provide is and square being directly proportional of voltage, the current conversion station busbar voltage direct current system reactive power caused that declines occurs that a large amount of vacancy can only lean on receiving end AC network to provide, if receiving end AC system is comparatively weak, voltage support scarce capacity, electric power system can be made not have ability to maintain the dynamic equilibrium of reactive power, and then cause electric power system part of nodes voltage deviation voltage permissible error value.In Practical Project, for 220kV and above AC system, the deviation of voltage will control within ± 5%, if voltage is lower than this numerical value, there will be Driving Torque reduction, stator current increase, the problems such as stall for main loads motor in electrical network.
The network configuration of system and running status thereof can be embodied by Jacobian matrix, utilize Jacobian matrix to derive the relation of reactive power impact and voltage-drop.By to voltage and the decoupling zero of merit angle, expand or depression of order Jacobian matrix, and then utilize the singularity of matrix to judge the pattern of the voltage-drop of system.Trend Jacobian matrix is
Δ P Δ Q = j 1 ′ j 2 ′ j 3 ′ j 4 ′ Δ δ Δ U - - - ( 2 )
Under the meritorious constant prerequisite of supposition, the voltage Jacobian matrix of simplification can be had
Δ Q = ( j 4 ′ - j 3 ′ j 1 ′ - 1 j 2 ′ ) Δ U
From the voltage Jacobian matrix simplified, the relation between reactive power impact and the situation of change of node voltage can be obtained, that is, Δ U = ( j 4 ′ - j 3 ′ j 1 ′ - 1 j 2 ′ ) - 1 Δ Q
Rely on the amplitude analysis of the dynamic reactive of direct current, the disturbed rear transient state of direct current maximum reactive power impact △ Q can be obtained.Then utilize above formula to calculate and determine affected node and voltage condition thereof, thus realize the alternating current-direct current idle tolerance to AC network influence degree and scope alternately.
For above-mentioned result of calculation, by put up detailed simulation model in the electromagnetic transient simulation softwares such as PSCAD/EMTDC, RTDS after, can assess AC network coverage alternating current-direct current is idle alternately, make the relevant evaluation of coverage.
Ac and dc systems dynamic interaction proposed by the invention is idle coverage performance estimating method, combine the effectively directly perceived of the accurate Calculation of Jacobi extended matrix and electromagnetic transient state procedure PSCAD/EMTDC, RTDS, achieve direct current system reactive power impact to AC network coverage quick, accurately differentiate.The affect border idle for dynamic interaction in actual AC-DC interconnecting power network provides a kind of simple method efficiently, power system operation personnel are grasped, assesses direct current reactive power impact to the impact of AC system, orientation improves AC network voltage support ability, reduce the voltage deviation normal value region caused in DC system fault process, reduce the impact on power system load, ensure that the safe and stable operation of AC-DC interconnecting power network is significant.
Accompanying drawing explanation
Fig. 1 is the alternating current-direct current idle emulation to AC network coverage and analytic method schematic diagram alternately;
Fig. 2 is the realization flow schematic diagram of an embodiment in the idle coverage appraisal procedure of a kind of alternating current-direct current of the present invention dynamic interaction;
Fig. 3 is the evaluating system Organization Chart of an embodiment in the idle coverage appraisal procedure of a kind of alternating current-direct current of the present invention dynamic interaction.
Embodiment
In order to make goal of the invention of the present invention, technical scheme and Advantageous Effects thereof more clear, below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.Should be understood that, the embodiment described in this specification is only used to explain the present invention, is not intended to limit the present invention.
The invention provides the idle coverage appraisal procedure of a kind of alternating current-direct current dynamic interaction, described appraisal procedure comprises the steps,
The minimum change of current bus voltage value of step 1, simulation calculation;
Step 2, determine alternating current-direct current exchange the idle coverage to AC system;
Step 3, performance evaluation.
Further, described step 1 comprises: utilize the electromagnetic transients program such as PSCAD/EMTDC, RTDS, by setting up the detailed model of Ac/dc Power Systems, the change of current bus of a certain direct current system Inverter Station emulates the most serious three-phase metallic earthing fault, calculates and make direct current system drop point place's change of current bus minimum amount of voltage that.
Further, described step 2 comprises: after direct current system Inverter Station change of current busbar fault, with the electrical distance of distance direct current drop point for standard, carries out traverse scanning to the interchange node busbar voltage near direct current drop point, motor speed-torque characteristics; Equal at initial value when certain exchanges node busbar voltage effective value, this Nodes can be thought at this moment on the idle border on AC network impact of alternating current-direct current dynamic interaction; Near direct current system drop point place within these exchange node, namely it is that alternating current-direct current exchanges the idle coverage to AC network that the busbar voltage effective value exchanging node is less than in initial value region, region beyond this node not can be thought and exchanges idle impact by alternating current-direct current, thus can determine that alternating current-direct current exchanges the idle coverage to AC system.
Further, described step 3 comprises: by the voltage-drop situation of each node of AC network beyond the relatively above idle reciprocal effect scope of alternating current-direct current drawn, notional result is that all nodes outside coverage there will not be voltage deviation normal value situation, may have node voltage within scope lower than normal value, the situations such as induction-motor load reduction of speed occur; Based on this standard, can make an appraisal to the appraisal procedure reliability of the idle coverage of this ac and dc systems dynamic interaction.
In AC-DC interconnecting power network, when direct current system change of current bus place breaks down (through experimental verification, situation the most serious is three-phase metallic earthing), cause Inverter Station in-place reactive power compensation device to provide idle that sharply decline of voltage greatly reduces, for capacitor compensation the most common, its reactive power that can provide and its both end voltage meet following relation:
Q = U 2 C - - - ( 1 )
Therefore, the reactive power that capacitor can provide is and square being directly proportional of voltage, the current conversion station busbar voltage direct current system reactive power caused that declines occurs that a large amount of vacancy can only lean on receiving end AC network to provide, if receiving end AC system is comparatively weak, voltage support scarce capacity, electric power system can be made not have ability to maintain the dynamic equilibrium of reactive power, and then cause electric power system part of nodes voltage deviation voltage permissible error value.In Practical Project, for 220kV and above AC system, the deviation of voltage will control within ± 5%, if voltage is lower than this numerical value, there will be Driving Torque reduction, stator current increase, the problems such as stall for main loads motor in electrical network.
The network configuration of system and running status thereof can be embodied by Jacobian matrix, utilize Jacobian matrix to derive the relation of reactive power impact and voltage-drop.By to voltage and the decoupling zero of merit angle, expand or depression of order Jacobian matrix, and then utilize the singularity of matrix to judge the pattern of the voltage-drop of system.Trend Jacobian matrix is
Δ P Δ Q = j 1 ′ j 2 ′ j 3 ′ j 4 ′ Δ δ Δ U - - - ( 2 )
Under the meritorious constant prerequisite of supposition, the voltage Jacobian matrix of simplification can be had
Δ Q = ( j 4 ′ - j 3 ′ j 1 ′ - 1 j 2 ′ ) Δ U
From the voltage Jacobian matrix simplified, the relation between reactive power impact and the situation of change of node voltage can be obtained, that is, Δ U = ( j 4 ′ - j 3 ′ j 1 ′ - 1 j 2 ′ ) - 1 Δ Q
Rely on the amplitude analysis of the dynamic reactive of direct current, the disturbed rear transient state of direct current maximum reactive power impact △ Q can be obtained.Then utilize above formula to calculate and determine affected node and voltage condition thereof, thus realize the alternating current-direct current idle tolerance to AC network influence degree and scope alternately.
For above-mentioned result of calculation, by put up detailed simulation model in the electromagnetic transient simulation softwares such as PSCAD/EMTDC, RTDS after, can assess AC network coverage alternating current-direct current is idle alternately, make the relevant evaluation of coverage.
As shown in Figure 1, the coverage border drawn by emulation as shown by the solid line in the drawings, is R1 apart from the electrical distance of direct current system Inverter Station fault point; The border drawn by above analytical Calculation may outward containing or in be contained in and emulate the border that obtains, the electrical distance of distance direct current system Inverter Station fault point is R2, as shown in phantom in FIG..
The border drawn with emulation is for reference value, and bound radius emulation and parsing two kinds of modes obtained is poor, gets its poor absolute value and emulates border and make ratio, and definition ac and dc systems dynamic interaction idle coverage assessment errors COEFFICIENT K, is shown below:
K = | R 1 - R 2 | R 1 - - - ( 3 )
According to Practical Project operating experience, during K≤10%, think and illustrate that appraisal procedure effect is fine, the rest may be inferred, can about the alternating current-direct current idle performance evaluation table to AC network coverage alternately, as shown in table 1.
Table 1 alternating current-direct current is idle to AC network coverage performance evaluation table alternately
As shown in Figure 2, the basic procedure of the appraisal procedure of the idle coverage of the present embodiment ac and dc systems dynamic interaction is illustrated.
As shown in Figure 3, the basic function module of Performance Appraisal System:
1) emulation module
Emulation module mainly realizes utilizing the electromagnetic transients program such as PSCAD/EMTDC, RTDS, on the basis of detailed model setting up Ac/dc Power Systems, realize direct current system reactive power impact quantitatively to calculate closing on ac grid voltage impact, thus determine that direct current system reactive power impact is to AC system coverage.
2) computing module
Mainly utilize Jacobian matrix to derive the relation of reactive power impact and voltage-drop, and then accurately calculate because reactive power impact causes the situation of change of node voltage.
3) evaluation module
Computing module and emulation module contrast by evaluation module, complete the function of the idle coverage Performance Evaluation of ac and dc systems dynamic interaction.
Ac and dc systems dynamic interaction proposed by the invention is idle coverage performance estimating method, combine the effectively directly perceived of the accurate Calculation of Jacobi extended matrix and electromagnetic transient state procedure PSCAD/EMTDC, RTDS, achieve direct current system reactive power impact to AC network coverage quick, accurately differentiate.The affect border idle for dynamic interaction in actual AC-DC interconnecting power network provides a kind of simple method efficiently, power system operation personnel are grasped, assesses direct current reactive power impact to the impact of AC system, orientation improves AC network voltage support ability, reduce the voltage deviation normal value region caused in DC system fault process, reduce the impact on power system load, ensure that the safe and stable operation of AC-DC interconnecting power network is significant.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and amendment to above-mentioned execution mode.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the present invention.

Claims (5)

1. the idle coverage appraisal procedure of alternating current-direct current dynamic interaction, it is characterized in that, described appraisal procedure comprises the steps,
The minimum change of current bus voltage value of step 1, simulation calculation;
Step 2, determine alternating current-direct current exchange the idle coverage to AC system;
Step 3, performance evaluation.
2. the idle coverage appraisal procedure of alternating current-direct current dynamic interaction according to claim 1, it is characterized in that, described step 1 comprises: utilize PSCAD/EMTDC electromagnetic transients program, by setting up the detailed model of Ac/dc Power Systems, the change of current bus of a direct current system Inverter Station in office emulates the most serious three-phase metallic earthing fault, calculates and make direct current system drop point place's change of current bus minimum amount of voltage that.
3. the idle coverage appraisal procedure of alternating current-direct current dynamic interaction according to claim 1, it is characterized in that, described step 1 comprises: utilize RTDS electromagnetic transients program, by setting up the detailed model of Ac/dc Power Systems, the change of current bus of a direct current system Inverter Station in office emulates the most serious three-phase metallic earthing fault, calculates and make direct current system drop point place's change of current bus minimum amount of voltage that.
4. coverage appraisal procedure that the alternating current-direct current dynamic interaction according to claim 2 or 3 is idle, it is characterized in that, described step 2 comprises:
After direct current system Inverter Station change of current busbar fault, with the electrical distance of distance direct current drop point for standard, traverse scanning is carried out to the interchange node busbar voltage near direct current drop point, motor speed-torque characteristics;
Judge whether exchange node busbar voltage effective value equals at initial value, in this way, then set this Nodes at this moment on the idle border on AC network impact of alternating current-direct current dynamic interaction;
Near direct current system drop point place within this interchange node, namely it is that alternating current-direct current exchanges the idle coverage to AC network that the busbar voltage effective value exchanging node is less than in initial value region, region beyond this node is set as not exchanging idle impact by alternating current-direct current, thus can determine that alternating current-direct current exchanges the idle coverage to AC system.
5. the idle coverage appraisal procedure of alternating current-direct current dynamic interaction according to claim 4, it is characterized in that, described step 3 comprises:
By the voltage-drop situation of each node of AC network beyond the idle reciprocal effect scope of the more above-mentioned alternating current-direct current drawn,
Setting notional result is that all nodes outside coverage there will not be voltage deviation normal value situation, and may have node voltage within scope lower than normal value, induction-motor load reduction of speed situation occurs;
Based on this standard, the appraisal procedure reliability of the idle coverage of this ac and dc systems dynamic interaction is made an appraisal.
CN201510675992.2A 2015-10-16 2015-10-16 A kind of idle coverage appraisal procedure of alternating current-direct current dynamic interaction Active CN105186540B (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101534009A (en) * 2009-04-24 2009-09-16 华南理工大学 Analysis method for operating characteristics of power-frequency variable directional protection of AC-DC interconnected power grid
JP2013198341A (en) * 2012-03-22 2013-09-30 Inst Nuclear Energy Research Rocaec Decentralized power distribution system and its reverse power flow fault analyzing method
CN103065016A (en) * 2013-01-07 2013-04-24 华南理工大学 Method and system for determining alternating-current system fault range resulting in direct-current commutation failure
CN103117565A (en) * 2013-01-28 2013-05-22 南方电网科学研究院有限责任公司 Analysis method for researching alternating-current/direct-current interactive influence mechanism

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