CN111740409A - Power transmission steady state analysis method for flexible alternating current-direct current hybrid intelligent power distribution network - Google Patents

Power transmission steady state analysis method for flexible alternating current-direct current hybrid intelligent power distribution network Download PDF

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CN111740409A
CN111740409A CN202010563791.4A CN202010563791A CN111740409A CN 111740409 A CN111740409 A CN 111740409A CN 202010563791 A CN202010563791 A CN 202010563791A CN 111740409 A CN111740409 A CN 111740409A
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power transmission
power
distribution network
steady state
direct current
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Inventor
岳超
张舒凯
李美玲
王瑜
吕钧章
张文松
祁秋民
张丽娟
王正辉
李鑫
李洛
李兴
胡岗
张玮
朱子琪
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PowerChina Qinghai Electric Power Engineering Co Ltd
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PowerChina Qinghai Electric Power Engineering Co Ltd
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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
    • 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
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a power transmission steady state analysis method for a flexible alternating current-direct current hybrid intelligent power distribution network, which relates to the technical field of power and comprises the following steps: s1, setting a converter station control mode, and obtaining data information of the double-end VSC-HVDC flexible AC/DC power transmission system; s2, establishing a power transmission system simulation model for verifying the mode switching control strategy of the power transmission system under different fault types and different operation modes and the validity of the method for determining the direct-current voltage threshold value and the reference value; s3, substituting the data obtained in the step S1 into the model to calculate a system reliability index; and S4, establishing a power transmission steady state evaluation model of the power distribution network, bringing the reliability index into the power transmission steady state evaluation model of the power distribution network, and performing steady state analysis. The invention effectively reduces the system operation cost and optimizes the system operation mode.

Description

Power transmission steady state analysis method for flexible alternating current-direct current hybrid intelligent power distribution network
Technical Field
The invention relates to the technical field of electric power, in particular to a power transmission steady state analysis method for a flexible alternating current-direct current hybrid intelligent power distribution network.
Background
With the rapid development of economy and the remarkable increase of population in high-altitude areas, the demand of load is greatly increased, land resources in the areas are reduced, and the difficulty of expanding power supply corridors is increased. On the other hand, the development space of distributed power supplies in China is large, alternating current or direct current generated by the distributed power supplies can be connected into an alternating current distribution network only by a large number of converter devices, and the requirements on the direct current distribution network are increasingly shown no matter on the power generation side or the terminal user side. The continuous development of the power grid puts higher and higher requirements on the planning and construction of a power supply and distribution system, the traditional alternating current power distribution network structure cannot meet the development requirements of loads, and the intelligent power grid puts a great challenge on the controllability of the traditional alternating current power grid.
Users in high-altitude areas such as Qinghai, Tibet and Xinjiang are scattered, and long power supply and distribution lines are needed to realize power supply of the whole area. Due to the influence of line distribution parameters and line load distribution, voltage drop is severe due to long-distance power supply, and uncertainty of power distribution network operation is aggravated by the diversity of load types. Under the common driving of a plurality of factors, the development of a long-distance flexible AC/DC hybrid intelligent distribution network is trended by combining the particularity of a power supply mode in a high-altitude area. The alternating current-direct current hybrid power distribution network is an indispensable stage in the process of power grid transformation, and components and resources of a future smart power grid can be optimally borne through a flexible interconnection technology.
The flexible direct current converter has the advantages of maintaining the voltage and frequency stability of the interconnected alternating current system, independently controlling active power and reactive power, isolating alternating current faults and the like.
The flexible alternating current-direct current hybrid intelligent power distribution network is built in the high-altitude area, the safety and stability of a power system can be improved, the requirements of national green power and low carbon and environmental protection are met, huge social and economic benefits can be obtained, each power distribution area can supply power to users in a cooperative mode, and the power distribution network in the form has strong independence.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a power transmission steady state analysis method for a flexible alternating current-direct current hybrid intelligent power distribution network.
In order to achieve the purpose, the invention provides the following technical scheme: a power transmission steady state analysis method for a flexible alternating current-direct current hybrid intelligent power distribution network comprises the following steps:
s1, setting a converter station control mode, and carrying out linearization processing on a double-end VSC-HVDC flexible AC/DC power transmission system in the AC/DC parallel power transmission system to obtain data information of the double-end VSC-HVDC flexible AC/DC power transmission system;
s2, establishing a power transmission system simulation model for verifying the mode switching control strategy of the power transmission system under different fault types and different operation modes and the validity of the method for determining the direct-current voltage threshold value and the reference value;
and S3, substituting the data obtained in the step S1 into the model to calculate a system reliability index, generating a reliability block diagram under two working modes of the direct current power grid and the alternating current-direct current hybrid power grid aiming at the topological structure and function analysis of the flexible alternating current-direct current hybrid power grid, and calculating the system reliability index by combining different reliability criteria, wherein the reliability index comprises the system load loss probability, the load loss frequency and the expected value of the electric quantity shortage.
And S4, establishing a power transmission steady state evaluation model of the power distribution network, bringing the reliability index into the power transmission steady state evaluation model of the power distribution network, and performing steady state analysis.
In this embodiment, the following formula is adopted for index calculation of the reliability criterion
Figure BDA0002547077810000021
Wherein SiIs a reliability sensitivity index, R, of the i-th elementsAs an index of overall system reliability, RiIs an index of reliability of the ith element.
In this embodiment, the expected value of insufficient capacity is calculated by using an improved random production simulation method.
In this embodiment, the power equation for the load flow calculation of the direct current system in the flexible alternating current/direct current hybrid power distribution network adopts the following formula:
ΔPi＝Pi-Ui∑Ii
wherein: piInjected power for the ith equivalent node, ∑ IiIs the sum of all branch currents of the ith equivalent node, UiIs the voltage of the ith equivalent node.
In this embodiment, the power transmission steady-state evaluation model of the power distribution network includes:
s4l reading system data;
s42, calculating the normal state load flow;
s43 enumerates or randomly samples the fault event to obtain the system state;
s44 judging whether the system is in the state of splitting, if so, forming each subsystem, and entering the step S45; if the flexible AC/DC system is not split, analyzing the whole flexible AC/DC system;
s45, judging whether the power supply of each subsystem is sufficient, if the power supply is insufficient, reducing the load; if the power supply is sufficient, proceed to step S46;
s46, calculating the power flow of the fault state;
s47 checking the voltage and element capacity, if the voltage and element capacity are out of limit, reducing the load; if not, go to step S48;
s48 forming a reliability index;
s49 judging whether the fault state is enumerated or not or whether the sufficient sampling precision is achieved, if not, going to step S43;
s410 forms a system total index.
The invention has the technical effects and advantages that:
1. the flexible alternating current-direct current hybrid intelligent power distribution network system can balance the power flow in a wider range, and the access range of renewable energy sources is enlarged;
2. by adopting the flexible alternating current-direct current hybrid intelligent power distribution network system, the operation efficiency of the power distribution network in the high-altitude area is improved, the power supply reliability is improved, the consumption capability of the power distribution network to the distributed new energy devices is improved, the system trend is flexibly regulated and controlled, the system operation cost is effectively reduced, and the system operation mode is optimized.
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Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for analyzing the power transmission steady state of the flexible alternating current-direct current hybrid intelligent power distribution network shown in the attached figure 1 comprises the following steps:
s1, setting a converter station control mode, and carrying out linearization processing on a double-end VSC-HVDC flexible AC/DC power transmission system in the AC/DC parallel power transmission system to obtain data information of the double-end VSC-HVDC flexible AC/DC power transmission system;
s2, establishing a power transmission system simulation model for verifying the mode switching control strategy of the power transmission system under different fault types and different operation modes and the validity of the method for determining the direct-current voltage threshold value and the reference value;
and S3, substituting the data obtained in the step S1 into the model to calculate a system reliability index, generating a reliability block diagram under two working modes of the direct current power grid and the alternating current-direct current hybrid power grid aiming at the topological structure and function analysis of the flexible alternating current-direct current hybrid power grid, and calculating the system reliability index by combining different reliability criteria, wherein the reliability index comprises the system load loss probability, the load loss frequency and the expected value of the electric quantity shortage.
And S4, establishing a power transmission steady state evaluation model of the power distribution network, bringing the reliability index into the power transmission steady state evaluation model of the power distribution network, and performing steady state analysis.
In actual calculation, according to the element series relation, a series equivalent formula can be used for obtaining a two-state model and corresponding reliability parameters of the whole multi-end flexible direct current interconnection device, and the calculation formula is as follows:
Figure BDA0002547077810000041
Figure BDA0002547077810000042
Figure BDA0002547077810000043
wherein λ isDCThe equivalent failure rate of the multi-end flexible direct current interconnection device is obtained; lambda [ alpha ]eqiRepresenting the fault rate of the equivalent node of the multi-terminal flexible direct current system; r isDCIs the mean time to repair a fault per time; r isiRepairing time for equivalent faults of each subsystem; mu.sDCThe equivalent repair rate of the multi-end flexible direct current interconnection device is obtained.
According to the invention, the flexible alternating current-direct current hybrid intelligent power distribution network system is adopted to improve the operation efficiency of the power distribution network in the high-altitude area, improve the power supply reliability, improve the consumption capability of the power distribution network to the distributed new energy devices, flexibly regulate and control the system trend, effectively reduce the system operation cost and optimize the system operation mode.
In this embodiment, the following formula is adopted for index calculation of the reliability criterion
Figure BDA0002547077810000051
Wherein SiIs a reliability sensitivity index, R, of the i-th elementsAs an index of overall system reliability, RiIs an index of reliability of the ith element.
In this embodiment, the expected value of insufficient capacity is calculated by using an improved random production simulation method.
In this embodiment, the power equation for the load flow calculation of the direct current system in the flexible alternating current/direct current hybrid power distribution network adopts the following formula:
ΔPi＝Pi-Ui∑Ii
wherein: piInjected power for the ith equivalent node, ∑ IiIs the sum of all branch currents of the ith equivalent node, UiIs the voltage of the ith equivalent node.
In this embodiment, the power transmission steady-state evaluation model of the power distribution network includes:
s4l reading system data;
s42, calculating the normal state load flow;
s43 enumerates or randomly samples the fault event to obtain the system state;
s44 judging whether the system is in the state of splitting, if so, forming each subsystem, and entering the step S45; if the flexible AC/DC system is not split, analyzing the whole flexible AC/DC system;
s45, judging whether the power supply of each subsystem is sufficient, if the power supply is insufficient, reducing the load; if the power supply is sufficient, proceed to step S46;
s46, calculating the power flow of the fault state;
s47 checking the voltage and element capacity, if the voltage and element capacity are out of limit, reducing the load; if not, go to step S48;
s48 forming a reliability index;
s49 judging whether the fault state is enumerated or not or whether the sufficient sampling precision is achieved, if not, going to step S43;
s410 forms a system total index.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (7)

1. A power transmission steady state analysis method for a flexible alternating current-direct current hybrid intelligent power distribution network is characterized by comprising the following steps: the method comprises the following steps:
s1, setting a converter station control mode, and carrying out linearization processing on a double-end VSC-HVDC flexible AC/DC power transmission system in the AC/DC parallel power transmission system to obtain data information of the double-end VSC-HVDC flexible AC/DC power transmission system;
s2, establishing a power transmission system simulation model for verifying the mode switching control strategy of the power transmission system under different fault types and different operation modes and the validity of the method for determining the direct-current voltage threshold value and the reference value;
s3, substituting the data obtained in the step S1 into a model to calculate a system reliability index, generating a reliability block diagram under two working modes of a direct current power grid and an alternating current-direct current hybrid power grid aiming at the topological structure and the function analysis of the flexible alternating current-direct current hybrid power grid, and calculating the system reliability index by combining different reliability criteria, wherein the reliability index comprises a system load loss probability, a load loss frequency and an expected value of insufficient electric quantity;
and S4, establishing a power transmission steady state evaluation model of the power distribution network, bringing the reliability index into the power transmission steady state evaluation model of the power distribution network, and performing steady state analysis.
2. The power transmission steady state analysis method for the flexible alternating current-direct current hybrid intelligent power distribution network according to claim 1, characterized by comprising the following steps of: the set converter station control mode is that one end of the converter station is set to be a direct current voltage control mode to maintain the voltage stability of a direct current bus, and the other end of the converter station is set to be a mode combining active power control and a direct current voltage detection control mode to ensure the stable transmission of system power under various conditions.
3. The power transmission steady state analysis method for the flexible alternating current-direct current hybrid intelligent power distribution network according to claim 1, characterized by comprising the following steps of: the index calculation of the reliability criterion adopts the following formula
Figure FDA0002547077800000011
Wherein SiIs a reliability sensitivity index, R, of the i-th elementsAs an index of overall system reliability, RiIs an index of reliability of the ith element.
4. The power transmission steady state analysis method for the flexible alternating current-direct current hybrid intelligent power distribution network according to claim 1, characterized by comprising the following steps of: the expected value of the electricity shortage is calculated by using an improved random production simulation method.
5. The power transmission steady state analysis method for the flexible alternating current-direct current hybrid intelligent power distribution network according to claim 1, characterized by comprising the following steps of: the power transmission steady state evaluation model of the power distribution network comprises the following steps:
s4l reading system data;
s42, calculating the normal state load flow;
s43 enumerates or randomly samples the fault event to obtain the system state;
s44 judging whether the system is in the state of splitting, if so, forming each subsystem, and entering the step S45; if the flexible AC/DC system is not split, analyzing the whole flexible AC/DC system;
s45, judging whether the power supply of each subsystem is sufficient, if the power supply is insufficient, reducing the load; if the power supply is sufficient, proceed to step S46;
s46, calculating the power flow of the fault state;
s47 checking the voltage and element capacity, if the voltage and element capacity are out of limit, reducing the load; if not, go to step S48;
s48 forming a reliability index;
s49 judging whether the fault state is enumerated or not or whether the sufficient sampling precision is achieved, if not, going to step S43;
s410 forms a system total index.
6. The power transmission steady state analysis method for the flexible alternating current-direct current hybrid intelligent power distribution network according to claim 5, characterized by comprising the following steps of: the equation of the normal state load flow calculation power is delta Pi＝Pi-Ui∑Ii；
Wherein: piInjected power for the ith equivalent node, ∑ IiIs the sum of all branch currents of the ith equivalent node, UiAs the i-th equivalent nodeA voltage.
7. The power transmission steady state analysis method for the flexible alternating current-direct current hybrid intelligent power distribution network according to claim 5, characterized by comprising the following steps of: the fault load flow calculation adopts a Newton-Raphson method, and the flow is as follows:
(1) initializing, forming node admittance array, giving initial value x(0)；
(2) Entering an iterative loop with k equal to 0
2.1 calculating the function value f (x)(k)) Judging whether to converge | | f (x)(k))||≤；
2.2 calculate Jacobian matrix f (x)(k))，
2.3 calculating correction amount
Figure FDA0002547077800000031
2.4 correction of variables Deltax(k)＝x(k)+Δx(k)K is returned to 2.1 as k +1
(3) And outputting a calculation result.
CN202010563791.4A 2020-06-19 2020-06-19 Power transmission steady state analysis method for flexible alternating current-direct current hybrid intelligent power distribution network Pending CN111740409A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114034955A (en) * 2021-11-09 2022-02-11 浙江大学 Short-term reliability detection method considering dependent fault for AC/DC power system

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