CN105610168B - Application method of node voltage stability index of multi-feed-in alternating current and direct current system - Google Patents
Application method of node voltage stability index of multi-feed-in alternating current and direct current system Download PDFInfo
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- CN105610168B CN105610168B CN201610077592.6A CN201610077592A CN105610168B CN 105610168 B CN105610168 B CN 105610168B CN 201610077592 A CN201610077592 A CN 201610077592A CN 105610168 B CN105610168 B CN 105610168B
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Classifications
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- 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
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- 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
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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
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Abstract
The invention discloses an application method of node voltage stability indexes of a multi-feed-in alternating current and direct current system. The node voltage stability index of the multi-feed-in alternating current and direct current system provides a comprehensive and effective quantization index for the stability degree of the large disturbance voltage in a multi-direct current drop point area, is similar to the existing multi-feed-in short circuit ratio index, takes the bus short circuit capacity as a denominator and considers the influence of multiple loops of direct current, but is used as a comprehensive and comprehensive large disturbance voltage stability degree measuring index, further considers the regional load influence, the voltage stability effect of various dynamic reactive power compensation devices and the like, and takes the comprehensive factors as a numerator according to the weighting of dynamic reactive power demand conditions. The voltage stability index of the multi-feed-in alternating current and direct current system under the condition of large disturbance is concise and convenient to apply, a comprehensive and effective quantization index is provided for the large disturbance voltage stability degree of a multi-direct current drop point area, and an important reference index can be provided for power grid planning, multi-loop direct current access, system stability measure specification and the like.
Description
Technical field
The present invention relates to a kind of application process of the voltage stability index in the case of more feed-in ac and dc systems large disturbances,
Belong to the technical field of power system security stability analysis.
Technical background
Energy resources be distributed it is unbalanced with economic development, determine south electric network need for a comparatively long period of time into
Row transferring electricity from the west to the east and trans-regional most optimum distribution of resources.Distant view concentrates feed-in receiving end power grid with south electric network large-scale direct current,
Receiving End Load density further increases, and power grid alternating current-direct current, which influences each other, voltage stabilization and short circuit current are exceeded etc. asks
Topic is further prominent, and power networks risk and operation control difficulty may increase.
In more feed-in ac and dc systems, since failure may lead to multiple-circuit line commutation failure, active power and idle
A large amount of vacancy of power will keep the voltage stabilization of exchange receiving end more acute.Currently, in the world in power system steady stability side
More work has been done in face, and the theory and index in terms of abundant intensity are highly developed in terms of system evaluation, but for
Voltage stabilization Journal of Sex Research in the case of more feed-in ac and dc systems large disturbances there is no the method and index of systematization at present.Currently,
Due to more feed-in short-circuit ratioes, effective short-circuit ratio reflect more feed-in ac and dc systems electric network composition intensity and power grid to the change of current mother
The size of the reactive voltage enabling capabilities of line, the voltage stabilizations of more feed-in ac and dc systems mainly with more feed-in short-circuit ratioes, effectively
Short-circuit ratio characterizes, but these short-circuit ratio indexs, and physical concept is mainly the degree that influences each other reflected between direct current, not
It can indicate that dc power loses the influence degree to receiving end grid voltage sags, directly can not effectively reflect multi-infeed DC
The degree of stability of system, in addition, no to the voltage stabilization effect of loading effects, various dynamic reactive compensation devices fully anti-
It reflects, it is therefore desirable to more synthesis, more comprehensively and effectively index or computational methods, more directly to reflect multi-feed HVDC area
The voltage stabilization degree in domain quantitatively determines different capabilities in region, the direct current of different access ways is fallen into stable influence.
Invention content
It is an object of the invention to propose that a kind of more feed-in ac and dc systems refer in the voltage stability of large disturbances
Mark, can not only reflect the degree that influences each other between direct current, and the voltage of loading effects, various dynamic reactive compensation devices
Stablizing effect can also reflect wherein, more directly quantitatively to reflect the voltage stabilization degree in multi-feed HVDC region.
The technical scheme is that：A kind of node voltage stability of more feed-in ac and dc systems proposed by the present invention refers to
The node voltage stability indicator of mark, more feed-in ac and dc systems carries for the large disturbances voltage stabilization degree in multi-feed HVDC region
For the effective quantizating index of Comprehensive, the application of this index includes the following steps：
1) conditions setting selectes the range of nodes of analysis；
2) the dc power P of the conveying of each direct current is counteddcNjWith each ac bus institute band burden with power Ploadj；
3) according to electro-magnetic transient software, consider direct current reactive-load compensation coefficient and control mode these factors, determine each
The dynamic reactive demand of direct current, finds out correction factor α；
4) load model being considered as determines correction factor β according to load dynamic reactive demand curve；
5) capacity of short circuit of node i is found out using short-circuit current calculation program.
6) electromechanical transient simulation program is utilized, applies a reactive disturbance Δ Qi in node i, simulates other ac bus
The rate of descent Δ Uj of voltage flows busbar voltage rate of descent Δ Ui with this backcrossing, calculates MIIF；
7) consider MIIF and control characteristic, conversion considers the dynamic reactive that each dynamic reactive compensation device provides
QdriThe equivalence value at node i；
8) according to the above calculating parameter, the node voltage stability indicator MVSI that Index Formula (1) finds out node i is substituted intoi；
In formula：
SACiFor the capacity of short circuit of node i；
PdcNjFor the dc power of conveying；
PloadjBy ac bus band burden with power；
MIIFI, j=Δ Uj/ Δ Ui, it is indicated due to reactive disturbance Δ Qi, the rate of descent Δ Uj of other ac bus voltages
With the ratio of this backcrossing stream busbar voltage rate of descent Δ Ui, wherein Δ Uj, Δ Ui take perunit value；
α is considers the correction factor of direct current reactive-load compensation coefficient and control mode these factor institute bands；
β is the correction factor for considering load model；
QdriThe dynamic reactive provided for each dynamic reactive compensation device equivalence value at node i；
9) step 5)~8 are repeated), the voltage stability index of node i is calculated；
10) the node index of care is analyzed, sets stable indication range, the node of minimum value is less than to index
Further stability analysis is carried out, optimization rack, power supply arrangement install dynamic reactive compensation device analysis additional to improving stability index
Ability.
Currently, the voltage stabilization Journal of Sex Research in the case of more feed-in ac and dc systems large disturbances, there is no the side of systematization at present
Method and index.The indexs physical concepts such as existing more feed-in short-circuit ratioes, effective short-circuit ratio are mainly mutual between reflecting direct current
Influence degree, although part reflect more feed-in ac and dc systems electric network composition intensity and power grid to the idle electricity of change of current busbar
The size of enabling capabilities is pressed, but directly cannot effectively reflect the degree of stability of multi-infeed DC system.Proposed by the present invention one
For kind more feed-in ac and dc systems in the voltage stability index of large disturbances, index is concise, using convenient, for the first time for
The large disturbances voltage stabilization degree in multi-feed HVDC region provides the effective quantizating index of Comprehensive, can not only reflect direct current
Between the degree that influences each other, and the voltage stabilization effect of loading effects, various dynamic reactive compensation devices can also reflect
Wherein.The index can be used for quantitatively determine direct current is fallen into region, dynamic passive compensation and power supply arrangement etc. it is steady to voltage
The influence for determining degree provides reference for the follow-up DC transmission engineering access of multi-infeed HVDC system and Electric Power Network Planning；Can be
More direct currents are concentrated feed-in by the quantizating index in terms of the Optimal network frame evaluation offer long-time stability of more feed-in ac and dc systems
Load intensive region grid structure optimization problem solution have important practical significance.
Description of the drawings
Fig. 1 is the flow chart of index application of the present invention.
Specific implementation mode
With reference to attached drawing 1, the application process of the node voltage stability indicator of the more feed-in ac and dc systems of the present invention, more feed-ins
The node voltage stability indicator of ac and dc systems provides comprehensively comprehensive for the large disturbances voltage stabilization degree in multi-feed HVDC region
Effective quantizating index is closed, the application of this index includes the following steps：
1) conditions setting selectes the range of nodes of analysis；
2) the dc power P of the conveying of each direct current is counteddcNjWith each ac bus institute band burden with power Ploadj；
3) according to electro-magnetic transient software, consider the factors such as direct current reactive-load compensation coefficient and control mode, determine each straight
The dynamic reactive demand of stream, finds out correction factor α；
4) load model being considered as determines correction factor β according to load dynamic reactive demand curve；
5) capacity of short circuit of node i is found out using short-circuit current calculation program.
6) electromechanical transient simulation program is utilized, applies a reactive disturbance Δ Qi in node i, simulates other ac bus
The rate of descent Δ Uj of voltage flows busbar voltage rate of descent Δ Ui with this backcrossing, calculates MIIF；
7) consider MIIF and control characteristic, conversion considers the dynamic reactive that each dynamic reactive compensation device provides
QdriThe equivalence value at node i；
8) according to the above calculating parameter, the node voltage stability indicator MVSI that Index Formula (1) finds out node i is substituted intoi；
In formula：
SACiFor the capacity of short circuit of node i；
PdcNiFor the dc power of conveying；
PloadjBy ac bus band burden with power；
MIIFI, j=Δ Uj/ Δs Ui is (with reference to the definition of more feed-in impact factors, multi-infeed interaction
Factor), it indicates that, due to reactive disturbance Δ Qi, busbar voltage is flowed in rate of descent Δ Uj and this backcrossing of other ac bus voltages
The ratio of rate of descent Δ Ui, wherein Δ Ui, Δ Ui take perunit value；
α is considers the correction factor of the factors such as direct current reactive-load compensation coefficient and control mode institutes band；
β is the correction factor for considering load model；
QdriThe dynamic reactive provided for each dynamic reactive compensation device equivalence value at node i；
9) step 5)~8 are repeated), the voltage stability index of node i is calculated；
10) the node index of care is analyzed, such as sets stable indication range, the section of minimum value is less than to index
Point carries out further stability analysis, and the analyses such as optimization rack, power supply arrangement, installation dynamic reactive compensation device refer to improving stabilization
Target ability etc..
In the present embodiment, the node voltage stability indicator of the more feed-in ac and dc systems of the present invention and existing more feed-ins are short
Road place more similar than index is, all using busbar short-circuit capacity as denominator, consider the influence of multiple-circuit line, but as complete
The large disturbances voltage stabilization degree measurement index of face synthesis, it is also contemplated that region loading effects, various dynamic reactive compensation devices
Voltage stabilization effect etc., and these composite factors are regard as molecule according to the weighting of dynamic reactive conditions of demand.
In the present embodiment, above-mentioned each dynamic reactive compensation device includes power plant.
In the present embodiment, the influence of multiple-circuit line of the present invention consider direct current reactive-load compensation coefficient and control mode etc. because
The influence that element is brought, it is contemplated that weighted factor.
In the present embodiment, the present invention considers the influence of power load distributing and load model, and the influence to power load distributing is adopted
Be weighted with MIIF it is equivalent, additionally, it is contemplated that the difference of load model, it is contemplated that weighted factor.
In the present embodiment, the present invention considers that the dynamic reactive that each dynamic reactive compensation device provides is equivalent at node i
Value, so as to further reflect that it is crucial that power distribution, power supply type, dynamic reactive compensation device effect etc. influence voltage stabilization
Factor.
Claims (6)
1. a kind of application process of the node voltage stability indicator of more feed-in ac and dc systems, it is characterised in that：
The node voltage stability indicator of more feed-in ac and dc systems is the large disturbances voltage stabilization degree in multi-feed HVDC region
The effective quantizating index of Comprehensive is provided, the application of this index includes the following steps：
1) conditions setting selectes the range of nodes of analysis；
2) the dc power P of the conveying of each direct current is counteddcNjWith each ac bus institute band burden with power Ploadj；
3) according to electro-magnetic transient software, consider direct current reactive-load compensation coefficient and control mode these factors, determine each direct current
Dynamic reactive demand, find out correction factorα；
4) load model being considered as determines correction factor β according to load dynamic reactive demand curve；
5) capacity of short circuit of node i is found out using short-circuit current calculation program；
6) electromechanical transient simulation program is utilized, applies a reactive disturbance Δ Qi in node i, simulates other ac bus voltages
Rate of descent Δ Uj and this backcrossing stream busbar voltage rate of descent Δ Ui, calculate MIIF；
7) consider MIIF and control characteristic, conversion considers the dynamic reactive Q that each dynamic reactive compensation device providesdri
Equivalence value at node i；
8) according to the above calculating parameter, the node voltage stability indicator MVSI that Index Formula (1) finds out node i is substituted intoi；
In formula：
SACiFor the capacity of short circuit of node i；
PdcNjFor the dc power of conveying；
PloadjBy ac bus band burden with power；
MIIFI, j=Δ Uj/ Δ Ui, it is indicated due to reactive disturbance Δ Qi, rate of descent Δ Uj and the sheet of other ac bus voltages
The ratio of backcrossing stream busbar voltage rate of descent Δ Ui, wherein Δ Uj, Δ Ui take perunit value；
α is considers the correction factor of direct current reactive-load compensation coefficient and control mode these factor institute bands；
β is the correction factor for considering load model；
QdriThe dynamic reactive provided for each dynamic reactive compensation device equivalence value at node i；
9) step 5)~8 are repeated), the voltage stability index of node i is calculated；
10) the node index of care is analyzed, sets stable indication range, the node to index less than minimum value carries out
Further stability analysis, optimization rack, install energy of the dynamic reactive compensation device analysis to raising stability index additional at power supply arrangement
Power.
2. the application process of the node voltage stabilizing member index of more feed-in ac and dc systems according to claim 1, special
Sign is the node voltage stability indicators of more feed-in ac and dc systems place similar with existing more feed-in short-circuit ratio indexs
Be, all using busbar short-circuit capacity as molecule, consider the influence of multiple-circuit line, but as the large disturbances voltage of Comprehensive
Degree of stability measurement index, it is also contemplated that region loading effects, various dynamic reactive compensation devices voltage stabilization effect, and will
These composite factors are used as molecule according to the weighting of dynamic reactive conditions of demand.
3. the application process of the node voltage stability indicator of more feed-in ac and dc systems according to claim 1, special
Sign is that each dynamic reactive compensation device includes power plant.
4. the application process of the node voltage stability indicator of more feed-in ac and dc systems according to claim 1, special
Sign is that the influence of multiple-circuit line considers direct current reactive-load compensation coefficient and control mode these factors, and consider weighting because
Son.
5. the application process of the node voltage stability indicator of more feed-in ac and dc systems according to claim 1, special
Sign is to consider the influence of power load distributing and load model, the influence to power load distributing be weighted using MIIF it is equivalent,
Additionally, it is contemplated that the difference of load model, it is contemplated that weighted factor.
6. the application process of the node voltage stability indicator of more feed-in ac and dc systems according to claim 1, special
Sign is to consider the dynamic reactive of each dynamic reactive compensation device offer equivalence value at node i, so as to further anti-
Reflect power distribution, power supply type, dynamic reactive compensation device influential effect voltage stabilization key factor.
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| CN110492493B (en) * | 2019-08-16 | 2020-10-27 | 清华大学 | Reactive compensation configuration optimization method for power system |
| CN111488677B (en) * | 2020-03-24 | 2021-12-14 | 广东电网有限责任公司电力调度控制中心 | Multi-feed-in effective short-circuit ratio analysis method and device, terminal equipment and storage medium |
| CN111478321A (en) * | 2020-04-23 | 2020-07-31 | 许昌许继风电科技有限公司 | Power distribution network node selection method for connecting distributed wind power generation system |
| CN111555454A (en) * | 2020-05-18 | 2020-08-18 | 上海电力大学 | Method for evaluating stability of receiving end voltage of hybrid double-feed-in direct current transmission system |
| CN112557813B (en) * | 2020-11-26 | 2022-07-19 | 国网宁夏电力有限公司电力科学研究院 | Method for judging voltage stability of power grid under simultaneous fault of multiple loops of direct current |
| CN113991723B (en) * | 2021-10-22 | 2024-04-26 | 广东电网有限责任公司 | Energy storage power station configuration method for improving voltage stability of multi-feed direct current system |
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