CN104092233B - Method for evaluating voltage support strength index of each station to inverter station in multi-direct-current-drop-point system based on load flow calculation - Google Patents
Method for evaluating voltage support strength index of each station to inverter station in multi-direct-current-drop-point system based on load flow calculation Download PDFInfo
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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
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- 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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- 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]
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Abstract
The invention relates to a method for evaluating voltage support strength indexes of each station to an inverter station in a multi-direct-current drop point system based on load flow calculation, in particular to a method for evaluating voltage support strength indexes (VSF) of each station to the inverter station in the multi-direct-current drop point system based on load flow calculation. The method obtains the change of the voltage of the converter bus of each inverter station in the network before and after the reactive compensation equipment with certain capacity is put into a specified site of a certain power system network by solving the power system load flow before and after the reactive compensation equipment with certain capacity is put into the site, and further obtains the support strength index of each site for the voltage of the inverter stationVSF. The method for evaluating the voltage support strength index of each station to the inverter station in the multi-direct-current drop point system has the advantages of simple required data, convenient operation and capability of greatly improving the voltage support strength index of each station to the inverter stationVSFThe calculation efficiency of the index.
Description
Technical field
The present invention proposes that each website is to Inverter Station voltage branch in a kind of assessment multi-feed HVDC system based on Load flow calculation
The computational methods of the index (VSF) of intensity are supportted, belong to Power System Analysis technical field.
Background technology
When multiple-circuit line transmission system is to same AC system conveying electric energy, transmission of electricity receiving end just forms multi-infeed DC system
System (or being multi-feed HVDC power network).In multi-infeed DC system, receiving end fault in ac transmission system causes multiple-circuit line inversion
The voltage reduction stood, may cause multiple-circuit line system to occur commutation, cause dc power to decline, to make direct current after failure removal
Power quickly recovers, it is necessary to which AC system is supplied to the stronger voltage support of straight-flow system, and this is accomplished by suitable website
Configure reactive-load compensation equipment.
VSF (assessing index of each website to Inverter Station voltage support intensity in multi-feed HVDC system) is a kind of assesses
Different site configuration reactive-load compensation equipments is to the index of each Inverter Station voltage integrated supporting role, its calculation formula：
Δ u in formulajRepresent the difference (perunit value) of the front and rear each Inverter Station voltage magnitude of reactive-load compensation equipment input, PNjRepresent
Jth (j=1,2 ..., L, L are the sum of Inverter Station in system) returns the rated power (unit MW) of direct current, QiRepresent that website i is thrown
The capacity (unit MVAR) of the reactive-load compensation equipment entered.
By calculating the VSF of each website and then being ranked up, it can be referred to for the configuration provides of reactive-load compensation equipment.Each station
The VSF indexs of point can be obtained by transient emulation, but this method workload is very big, wastes time and energy, it is therefore necessary to propose one
Plant the simple calculating method of VSF indexs.
The content of the invention
The present invention proposes in a kind of assessment multi-feed HVDC system based on Load flow calculation each website to Inverter Station voltage
Data needed for support strength refers to calibration method, this method are simple, and calculating speed is fast, can greatly improve the calculating effect of VSF indexs
Rate.
The technical scheme is that：
The present invention's assesses in multi-feed HVDC system each website to the method for Inverter Station voltage support intensity index, including
Following steps：
1) the multi-feed HVDC power system network for needing to study is determined, the Load flow calculation mould of system to be studied is set up
Type；
2) Load flow calculation of the system is carried out, the ac bus voltage u of each Inverter Station is recordedj1, j=1,2 ..., L, L is to be
The sum of Inverter Station in system；
3) website i puts into certain capacity S in power networkiReactive-load compensation equipment, re-start system load flow calculating, record
The ac bus voltage u of each Inverter Stationj2, j=1,2 ..., L；
4) the changes delta u of each Inverter Station ac bus voltage is calculatedj, j=1,2 ..., L；
5) support strength index VSFs of the website i to each Inverter Station voltage is calculatedi。
The step 2) in, the Load flow calculation of the system is carried out, the ac bus voltage u of each Inverter Station is recordedj1, j=1,
2 ..., L, L are the sum of Inverter Station in system.
The step 3) in, website i puts into certain capacity S in power networkiReactive-load compensation equipment, re-start system tide
Stream calculation, records the ac bus voltage u of each Inverter Stationj2, j=1,2 ..., L.
The step 4) the middle changes delta u for calculating each Inverter Station ac bus voltagej, j=1,2 ..., L；
Δuj=uj2-uj1 (2)
U in formulaj2To put into capacity S at website iiReactive-load compensation equipment after electricity in calculation of tidal current at Inverter Station j
Press perunit value, uj1To throw people's capacity S at bus iiReactive-load compensation equipment before voltage mark in calculation of tidal current at Inverter Station j
One value, Δ ujRepresent the difference (perunit value) of voltage at the front and rear Inverter Station j of reactive-load compensation equipment input.
The present invention be in a kind of assessment multi-feed HVDC system based on Load flow calculation each website to Inverter Station voltage support
The method of intensity index.By solving a certain power system network before specified sites put into the reactive-load compensation equipment of certain capacity
Electric power system tide afterwards, obtains putting into the change of each Inverter Station change of current busbar voltage in the network before and after reactive-load compensation in the website
Change, and then try to achieve support strength index VSF of each website for Inverter Station voltage.Assessment multi-feed HVDC system proposed by the present invention
Each website is to the method for Inverter Station voltage support intensity index in system, and required data are simple, easy to operate, can greatly improve
The computational efficiency of VSF indexs.
Brief description of the drawings
Fig. 1 is flow chart of the invention.
Specific embodiment
Each website is to Inverter Station voltage support intensity in the assessment multi-feed HVDC system based on Load flow calculation of the present invention
Refer to calibration method, comprise the following steps：
1) the multi-feed HVDC power system network for needing to study is determined, the Load flow calculation mould of system to be studied is set up
Type；
2) Load flow calculation of the system is carried out, the ac bus voltage u of each Inverter Station is recordedj1, j=1,2 ..., L, L is to be
The sum of Inverter Station in system；
3) website i puts into certain capacity S in power networkiReactive-load compensation equipment, re-start system load flow calculating, record
The ac bus voltage u of each Inverter Stationj2, j=1,2 ..., L；
4) the changes delta u of each Inverter Station ac bus voltage is calculatedj, j=1,2 ..., L；
5) support strength index VSFs of the website i to each Inverter Station voltage is calculatedi。
The step 2) in, the Load flow calculation of the system is carried out, the ac bus voltage u of each Inverter Station is recordedj1, j=1,
2 ..., L, L are the sum of Inverter Station in system.
The step 3) in, website i puts into certain capacity S in power networkiReactive-load compensation equipment, re-start system tide
Stream calculation, records the ac bus voltage u of each Inverter Stationj2, j=1,2 ..., L.
The step 4) the middle changes delta u for calculating each Inverter Station ac bus voltagej, j=1,2 ..., L；
Δuj=uj2-uj1 (2)
U in formulaj2To put into capacity S at website iiReactive-load compensation equipment after electricity in calculation of tidal current at Inverter Station j
Press perunit value, uj1To throw people's capacity S at bus iiReactive-load compensation equipment before voltage mark in calculation of tidal current at Inverter Station j
One value, Δ ujRepresent the difference (perunit value) of voltage at the front and rear Inverter Station j of reactive-load compensation equipment input.
Remarked additionally below by embodiment is further to the present invention：
In south electric network rich big mode BPA flow datas in 2014,8 DC lines, 7 Inverter Stations, including day are had
Wide direct current (1800MW)-north suburb station, height start direct current (3000MW)-Zhaoqing station, Xingan's direct current (3000MW)-Bao'an station, Chu Suizhi
Flow (5000MW)-Suidong station, river city direct current (3000MW)-goose city station, general bridge direct current (5000MW)-Heshan station, ox straight from twice
Stream (2*3200MW)-and from station is changed, 8 times direct current total capacities are 27200MW, and equal drop point Guangdong is typical multi-feed HVDC system.
So that 500KV kapoks stand as an example, calculate strong to the voltage support of each Inverter Station in kapok station input reactive-load compensation equipment
Spend index VSF.
Initial Load flow calculation is carried out, the perunit value of each Inverter Station ac bus voltage is recorded, the 2nd row are listed in Table 1；
Kapok station input 300Mvar reactive-load compensation equipment, re-starts Load flow calculation, records the mark of each Inverter Station ac bus voltage
One value, is listed in Table 1 the 3rd row；The voltage of input reactive-load compensation equipment money is subtracted with the voltage after input reactive-load compensation equipment, is obtained
The voltage change of each Inverter Station, is listed in Table 1 the 4th row before and after to input reactive-load compensation equipment.
The kapok of table 1 stands to Inverter Station voltage support intensity index calculating process variable
| Site name | uj1 | uj2 | Δuj |
| North suburb station | 1.061788 | 1.061801 | 0.000013 |
| Zhaoqing station | 1.010837 | 1.011629 | 0.000792 |
| Bao'an station | 1.000942 | 1.001047 | 0.000105 |
| Goose city station | 1.010128 | 1.014606 | 0.004478 |
| Suidong station | 1.006563 | 1.007835 | 0.001272 |
| Heshan station | 1.002765 | 1.002876 | 0.000111 |
| Stood from changing | 1.009288 | 1.017071 | 0.007783 |
Then kapok station is to Inverter Station voltage support intensity index：
Claims (3)
1. each website is to Inverter Station voltage support intensity index in a kind of assessment multi-feed HVDC system based on Load flow calculation
Method, it is characterised in that comprise the following steps：
1) the multi-feed HVDC power system network for needing to study is determined, the power flow algorithm of system to be studied is set up；
2) Load flow calculation of the system is carried out, the ac bus voltage u of each Inverter Station is recordedj1, j=1,2 ..., L, L is in system
The sum of Inverter Station；
3) website i puts into certain capacity S in power networkiReactive-load compensation equipment, re-start system load flow calculating, record each inverse
Become the ac bus voltage u at stationj2, j=1,2 ..., L；
4) the changes delta u of each Inverter Station ac bus voltage is calculatedj, j=1,2 ..., L；
5) support strength index VSFs of the website i to each Inverter Station voltage is calculatedi；
The step 2) in, the Load flow calculation of the system is carried out, the ac bus voltage u of each Inverter Station is recordedj1, j=1,2 ...,
L, L are the sum of Inverter Station in system.
2. each website is to Inverter Station voltage in the assessment multi-feed HVDC system according to claim 1 based on Load flow calculation
Support strength refers to calibration method, it is characterised in that the step 3) in, website i puts into certain capacity S in power networkiIdle benefit
Equipment is repaid, system load flow calculating is re-started, records the ac bus voltage u of each Inverter Stationj2, j=1,2 ..., L.
3. each website is to Inverter Station voltage in the assessment multi-feed HVDC system according to claim 1 based on Load flow calculation
Support strength refers to calibration method, it is characterised in that the step 4) the middle changes delta u for calculating each Inverter Station ac bus voltagej, j
=1,2 ..., L；
Δuj=uj2-uj1 (2)
U in formulaj2To put into capacity S at website iiReactive-load compensation equipment after voltage mark in calculation of tidal current at Inverter Station j
One value, uj1To throw people's capacity S at bus iiReactive-load compensation equipment before voltage perunit in calculation of tidal current at Inverter Station j
Value, Δ ujRepresent the difference of voltage at the front and rear Inverter Station j of reactive-load compensation equipment input.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410310347.6A CN104092233B (en) | 2014-06-30 | 2014-06-30 | Method for evaluating voltage support strength index of each station to inverter station in multi-direct-current-drop-point system based on load flow calculation |
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|---|---|---|---|
| CN201410310347.6A CN104092233B (en) | 2014-06-30 | 2014-06-30 | Method for evaluating voltage support strength index of each station to inverter station in multi-direct-current-drop-point system based on load flow calculation |
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| CN104950205B (en) * | 2015-06-30 | 2019-01-04 | 南方电网科学研究院有限责任公司 | Quantitative analysis method for influence of alternating current system fault on direct current line |
| CN105610168B (en) * | 2016-02-03 | 2018-07-31 | 南方电网科学研究院有限责任公司 | Application method of node voltage stability index of multi-feed-in alternating current and direct current system |
| 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 |
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