CN103107546B - Method for evaluating voltage support strength of station to inverter station in multi-direct-current point-falling system - Google Patents

Method for evaluating voltage support strength of station to inverter station in multi-direct-current point-falling system Download PDF

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CN103107546B
CN103107546B CN201310020909.9A CN201310020909A CN103107546B CN 103107546 B CN103107546 B CN 103107546B CN 201310020909 A CN201310020909 A CN 201310020909A CN 103107546 B CN103107546 B CN 103107546B
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voltage
inverter station
station
compensation equipment
reactive
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CN103107546A (en
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赵勇
洪潮
曾勇刚
金小明
夏成军
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China South Power Grid International 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
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    • Y02E40/30—Reactive power compensation

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Abstract

The invention discloses a method for evaluating the voltage support strength of a station to an inverter station in a multi-direct-current-drop-point power grid, which comprises the steps of establishing a simulation model of the multi-direct-current-drop-point power grid to be researched; switching reactive compensation equipment with certain capacity at the ith station in the power grid, simulating and analyzing the change condition of bus voltage of each inversion station, and calculating the difference value delta u of the voltage of each inversion station before and after the reactive compensation equipment is switched oni，j(ii) a Calculating the supporting strength of the station i to the voltage of each inversion station; and repeating the steps until i = M, and taking the maximum value as a guide and a reference index for configuring the reactive compensation equipment configuration. According to the method, the voltage change per unit value of each inversion station converter bus, which is caused by switching of a certain capacity of reactive compensation equipment at a specified station, is calculated, and then the support strength index VSF of each station for the voltage of the inversion station is obtained, so that the support effect of each station on the voltage of the inversion station is evaluated and used as a guide and reference index of a reactive compensation equipment configuration scheme.

Description

In assessment multi-feed HVDC system, website is to the method for Inverter Station voltage support intensity
Technical field
The invention belongs to power system analysis technical field, more specifically, relate to and a kind ofly assess website in multi-feed HVDC electrical network and, to the method for Inverter Station voltage support intensity, particularly assess the method for each website to Inverter Station voltage support intensity index VSF in a kind of multi-feed HVDC electrical network.
Background technology
Multi-feed HVDC electrical network and many times high voltage direct current transmissions concentrate the receiving end AC network of feed-in.In multi-feed HVDC electrical network, the Voltage-stabilizing Problems of current conversion station ac bus is the major issue that puzzlement DC transmission system is normally run, all the more so when receiving end AC system is more weak especially.Because AC/DC parallel operation, multiple-circuit line concentrate feed-in, cause receiving end electric network reactive-load voltage problem and angle stability problem, the alternating current-direct current problem of influencing each other to be closely connected, be interweaved, stability characteristic (quality) is complicated.
In multi-feed HVDC electrical network, receiving end AC system subregion fault may cause multiple-circuit line transmission of electricity inverter generation commutation failure, causes direct current power to decline.The power recovery process of direct current system relies on the voltage support of AC system, needs to absorb a large amount of reactive powers.And the process that direct current power is recovered is faster, illustrative system is stronger.
During fault in ac transmission system and after failure removal, the dynamic reactive enabling capabilities of receiving-end system recovers for the power of DC transmission system and the stability of a system has significant impact.Access a large amount of dynamic reactive compensation device in AC system after, reactive power compensation fast can be provided in direct current power recovery process, thus be conducive to the fast quick-recovery promoting direct current power.
Select suitable infield configuration dynamic passive compensation to be the precondition giving full play to dynamic reactive compensation device effect, there is important practical significance.Therefore be necessary that the reactive-load compensation equipment assessing different site configuration is to the size of the supporting role of Inverter Station voltage, propose a kind ofly to assess the index of each website to the effect of Inverter Station voltage support, using as the guide of dynamic passive compensation equipment configuration scheme and reference index.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention proposes a kind of website of assessing in multi-feed HVDC electrical network to the method for Inverter Station voltage support intensity.Index definition of the present invention is clear, and method is simple, convenient and practical.
To achieve these goals, technical scheme of the present invention is:
Assess website in multi-feed HVDC electrical network, to a method for Inverter Station voltage support intensity, to comprise the following steps:
S1. set up the simulation model of multi-feed HVDC electrical network to be studied, this electrical network comprises M place reactive-load compensation equipment switching website to be studied, K returns direct current transportation loop and other electric network element;
S2. the i-th place website switching certain capacity S in electrical network ireactive-load compensation equipment, i=1,2 ... M, the situation of change of each Inverter Station busbar voltage of simulation analysis, calculates the difference DELTA u that reactive-load compensation equipment drops into each Inverter Station voltage in front and back i,j, Δ u i,jget perunit value, j=1,2 ..., K, K are the sum of Inverter Station in system;
S3. website i is calculated to the support strength VSF of each Inverter Station voltage i;
S4. step S1, S2, S3 is repeated, until i=M; Wherein VSF imaximum as the guide of configuration reactive-load compensation equipment allocation plan and reference index.
Wherein VSF ilarger, illustrate at i-th place's website stronger for the voltage support effect of Inverter Station, be more suitable for the guide as configuration reactive-load compensation equipment allocation plan and reference index.
In described step S2, the i-th place website switching certain capacity S in electrical network ireactive-load compensation equipment, i=1,2 ... M, the situation of change of each Inverter Station busbar voltage of simulation analysis, the difference DELTA u of each Inverter Station voltage before and after reactive-load compensation equipment drops into i, jfor:
Δu i,j=|u i,j+-u i,j-| （1）
Δ u i,jget perunit value, j=1,2 ..., K, K are the sum of Inverter Station in system, u in formula i, j+for bus i place switching capacity S ireactive-load compensation equipment after voltage perunit value, u i, j-for bus i place switching capacity S ireactive-load compensation equipment before voltage perunit value, S iunit is MVAR.
In described step S3, website i is to the support strength VSF of each Inverter Station voltage ifor:
VSF i = Σ j = 1 K ( Δ u i , j × P Nj ) S i - - - ( 2 )
In formula: Δ u i,jrepresent that reactive-load compensation equipment drops into the difference of each Inverter Station voltage in front and back, Δ u i,jfor perunit value, P njrepresent that jth returns the rated power of direct current, unit MW, S irepresent the capacity of the reactive-load compensation equipment of switching, unit MVAR.
VSF in described step S4 ivalue according to from big to small order sequence; VSF isize for representing the power of i-th place's website for the voltage support effect of each Inverter Station.Wherein VSF ilarger, illustrate at i-th place's website stronger for the voltage support effect of each Inverter Station.In fact the holding strength index VSF of each Inverter Station voltage is reflected to the size of the mutual impedance of each Inverter Station and switching point and the weighted average of direct current rated power in nodal impedance matrix.
Each website that the present invention proposes is to the index VSF of Inverter Station voltage support intensity, reflect different website reactive-load compensation equipment to the supporting role of Inverter Station voltage, the Preliminary screening index can layouted as reactive-load compensation equipment, the formulation for various reactive-load compensation equipment allocation plan provides guide and reference; Simultaneously in the allocation plan of concrete reactive-load compensation equipment, be improve system stability level for target.It is clear that the support strength index VSF to Inverter Station voltage that the present invention proposes defines, and appraisal procedure is simple, can play well instruct and reference role for the allocation plan of dynamic passive compensation setting in research multi-feed HVDC system.
Accompanying drawing explanation
Fig. 1 is the calculation flow chart of each website of the present invention to the index VSF of Inverter Station voltage support intensity.
Specific embodiment
Below in conjunction with accompanying drawing, the present invention is described further, but embodiments of the present invention are not limited to this.
Embodiment one
As shown in Figure 1, in assessment multi-feed HVDC electrical network of the present invention, website is to the method for Inverter Station voltage support intensity, comprises the following steps:
S1. set up the simulation model of multi-feed HVDC electrical network to be studied, this electrical network comprises M place reactive-load compensation equipment switching website to be studied, K returns direct current transportation loop and other electric network element;
S2. the i-th place website switching certain capacity S in electrical network ireactive-load compensation equipment, i=1,2 ... M, the situation of change of each Inverter Station busbar voltage of simulation analysis, calculates the difference DELTA u that reactive-load compensation equipment drops into each Inverter Station voltage in front and back i,j, Δ u i,jget perunit value, j=1,2 ..., K, K are the sum of Inverter Station in system;
S3. website i is calculated to the support strength VSF of each Inverter Station voltage i;
S4. step S1, step S2, step S3 is repeated, until i=M, VSF iaccording to order sequence from big to small; VSF ilarger, illustrate at i-th place's website stronger for the voltage support effect of Inverter Station, VSF imaximum as the guide of configuration reactive-load compensation equipment allocation plan and reference index.
In described step S2, the i-th place website switching certain capacity S in electrical network ireactive-load compensation equipment, i=1,2 ... M, the situation of change of each Inverter Station busbar voltage of simulation analysis, the difference DELTA u of each Inverter Station voltage before and after reactive-load compensation equipment drops into i,jfor:
Δu i,j=|u i,j+-u i,j-| （1）
Δ u i,jget perunit value, j=1,2 ..., K, K are the sum of Inverter Station in system, u in formula i, j+for bus i place switching capacity S ireactive-load compensation equipment after voltage perunit value, u i, j-for bus i place switching capacity S ireactive-load compensation equipment before voltage perunit value, S iunit is MVAR.
In described step S3, website i is to the support strength VSF of each Inverter Station voltage ifor:
VSF i = Σ j = 1 K ( Δ u i , j × P Nj ) S i - - - ( 2 )
Δ u in formula i,jrepresent that reactive-load compensation equipment drops into the difference (perunit value) of each Inverter Station voltage in front and back, P njrepresent that jth returns the rated power (unit MW) of direct current, S irepresent the capacity (unit MVAR) of the reactive-load compensation equipment of switching.
Described step S4 repeats step S1, step S2, step S3, until i=M, VSF iaccording to order sequence from big to small; VSF ilarger, illustrate at i-th place's website stronger for the voltage support effect of Inverter Station, in fact the holding strength index VSF of each Inverter Station voltage is reflected to the size of the mutual impedance of each Inverter Station and switching point and the weighted average of direct current rated power in nodal impedance matrix.
Embodiment two
Below by embodiment, further supplementary notes are done to the present invention:
According to south electric network rich large mode BPA emulated data in 2012, south electric network direct current scale in 2012 reaches 8 times, comprise Tianguang HVDC (1800MW), expensive wide I direct current (3000MW), expensive wide II direct current (3000MW), Chu Sui direct current (5000MW), three wide direct currents (3000MW), waxy common wheat direct current (5000MW), small stream Lip river cross twice direct currents (6400MW), 8 times direct current total capacity is 27200MW, all falls
Point Guangdong.To each website of rich large mode in 2015, consider the reactive-load compensation equipment of switching 300MVAR respectively,
Consider by access 500kV bus in the present embodiment, obtain each time direct current that each website switched capacitor causes
The voltage wave moment of Inverter Station.Finally, VSF is drawn according to formula (2).
VSF i = Σ j = 1 K ( Δ u i , j × P Nj ) S i - - - ( 2 )
Δ u in formula i,jrepresent that reactive-load compensation equipment drops into the difference (perunit value) of each Inverter Station voltage in front and back, P njrepresent that jth returns the rated power (unit MW) of direct current, S irepresent the capacity (unit MVAR) of the reactive-load compensation equipment of switching.
For from the reactive-load compensation equipment changing change of current bus switching 300MVAR, each Inverter Station voltage fluctuation situation can be tried to achieve: from change station 0.0111, Heshan station 0.0016, Suidong station 0.0030, station, Bao'an 0.0011, station, Zhaoqing 0.0029, station, the north suburb 0.0032, station, goose city 0.0041, then stand to Inverter Station voltage support intensity index from change;
VSF i = Σ j = 1 K ( ΔΔ i , j × P Nj ) S i
= 0.0111 * 6400 + 0.0016 * 5000 + 0.0030 * 5000 + 0.0011 * 3000 + 0.0029 * 3000 + 0.0032 * 1800 + 0.0041 * 3000 300
≈ 0.414
Other each websites are similar to Inverter Station voltage support intensity index computational methods, its each website is respectively Inverter Station voltage support intensity index: sorted by size to Inverter Station voltage support intensity index by each website, obtain website maximum to Inverter Station voltage support intensity index VSF value, using this value as the guide of configuration reactive-load compensation equipment allocation plan and reference index.
Above-described embodiments of the present invention, do not form limiting the scope of the present invention.Any amendment done within spiritual principles of the present invention, equivalent replacement and improvement etc., all should be included within claims of the present invention.

Claims (3)

1. assess website in multi-feed HVDC electrical network, to a method for Inverter Station voltage support intensity, to it is characterized in that, comprise the following steps:
S1. set up the simulation model of multi-feed HVDC electrical network to be studied, this electrical network comprises M place reactive-load compensation equipment switching website to be studied, K returns direct current transportation loop and other electric network element;
S2. the i-th place website switching certain capacity S in electrical network ireactive-load compensation equipment, i=1,2 ... M, the situation of change of each Inverter Station busbar voltage of simulation analysis, calculates the difference Du that reactive-load compensation equipment drops into each Inverter Station voltage in front and back i,j, Du i,jget perunit value, j=1,2 ..., K, K are the sum of Inverter Station in system;
S3. website i is calculated to the support strength VSF of each Inverter Station voltage i;
S4. step S1, S2, S3 is repeated, until i=M, wherein VSF imaximum as the guide of configuration reactive-load compensation equipment allocation plan and reference index;
In described step S3, website i is to the support strength VSF of each Inverter Station voltage ifor:
VSF i = Σ j = 1 K ( Δ u i , j × P Nj ) S i - - - ( 2 )
In formula: Du i,jrepresent that reactive-load compensation equipment drops into the difference of each Inverter Station voltage in front and back, Du i,jfor perunit value, P njrepresent that jth returns the rated power of direct current, unit MW, S irepresent the capacity of the reactive-load compensation equipment of switching, unit MVAR.
2. in assessment multi-feed HVDC electrical network according to claim 1, website, to the method for Inverter Station voltage support intensity, is characterized in that, in described step S2, and the i-th place website switching certain capacity S in electrical network ireactive-load compensation equipment, i=1,2 ... M, the situation of change of each Inverter Station busbar voltage of simulation analysis, the difference Du of each Inverter Station voltage before and after reactive-load compensation equipment drops into i,jfor:
Du i,j＝|u i,j+-u i,j-| (1)
Du i,jget perunit value, j=1,2 ..., K, K are the sum of Inverter Station in system, u in formula i,j+ be bus i place switching capacity S ireactive-load compensation equipment after voltage perunit value, u i,j-be bus i place switching capacity S ireactive-load compensation equipment before voltage perunit value, S iunit is MVAR.
3. in assessment multi-feed HVDC electrical network according to claim 1, website, to the method for Inverter Station voltage support intensity, is characterized in that, VSF in described step S4 ivalue according to from big to small order sequence; VSF isize for representing the power of i-th place's website for the voltage support effect of each Inverter Station.
CN201310020909.9A 2013-01-18 2013-01-18 Method for evaluating voltage support strength of station to inverter station in multi-direct-current point-falling system Active CN103107546B (en)

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CN104319760B (en) * 2014-06-30 2016-07-13 南方电网科学研究院有限责任公司 Method and system for evaluating voltage supporting capability of multi-direct-current-fed alternating-current power grid
CN104092223A (en) * 2014-06-30 2014-10-08 中国南方电网有限责任公司电网技术研究中心 Method for evaluating voltage support strength index of each station to inverter station in multi-direct-current drop point system based on node impedance matrix
CN104410080B (en) * 2014-11-05 2016-08-24 华南理工大学 Method for evaluating voltage supporting capability of multi-direct-current feed-in power grid with dynamic reactive compensation
CN106356865A (en) * 2016-09-05 2017-01-25 中国南方电网有限责任公司电网技术研究中心 Node reactive voltage comprehensive support capability determination method
CN110412949A (en) * 2018-11-27 2019-11-05 上海同禾工程科技股份有限公司 Low pressure scene turn-key system and its application method for axle power servo-system
CN110212548B (en) * 2019-05-16 2021-05-04 广东电网有限责任公司电力调度控制中心 Configuration method and device of STATCOM (static synchronous compensator) of multi-DC feed-in receiving end system
CN110912199A (en) * 2019-11-18 2020-03-24 南方电网科学研究院有限责任公司 Point distribution and constant volume method and device for multi-direct-current feed-in receiving-end power grid synchronous phase modifier

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