CN113241801B - New energy critical permeability determination method and device based on voltage stability constraint - Google Patents

New energy critical permeability determination method and device based on voltage stability constraint Download PDF

Info

Publication number
CN113241801B
CN113241801B CN202110401105.8A CN202110401105A CN113241801B CN 113241801 B CN113241801 B CN 113241801B CN 202110401105 A CN202110401105 A CN 202110401105A CN 113241801 B CN113241801 B CN 113241801B
Authority
CN
China
Prior art keywords
new energy
power grid
voltage
regional
permeability
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110401105.8A
Other languages
Chinese (zh)
Other versions
CN113241801A (en
Inventor
赵伟
李晓珺
李付强
唐晓骏
潘艳
李晶
徐鹏
吉平
董烨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Electric Power Research Institute Co Ltd CEPRI
North China Grid Co Ltd
Original Assignee
China Electric Power Research Institute Co Ltd CEPRI
North China Grid Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Electric Power Research Institute Co Ltd CEPRI, North China Grid Co Ltd filed Critical China Electric Power Research Institute Co Ltd CEPRI
Priority to CN202110401105.8A priority Critical patent/CN113241801B/en
Publication of CN113241801A publication Critical patent/CN113241801A/en
Application granted granted Critical
Publication of CN113241801B publication Critical patent/CN113241801B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G06Q10/06393—Score-carding, benchmarking or key performance indicator [KPI] analysis
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Energy or water supply
    • 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
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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]
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • 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]

Landscapes

  • Business, Economics & Management (AREA)
  • Engineering & Computer Science (AREA)
  • Human Resources & Organizations (AREA)
  • Economics (AREA)
  • Power Engineering (AREA)
  • Strategic Management (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Development Economics (AREA)
  • Educational Administration (AREA)
  • Marketing (AREA)
  • Entrepreneurship & Innovation (AREA)
  • Theoretical Computer Science (AREA)
  • Tourism & Hospitality (AREA)
  • Physics & Mathematics (AREA)
  • General Business, Economics & Management (AREA)
  • Operations Research (AREA)
  • Quality & Reliability (AREA)
  • Game Theory and Decision Science (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • General Health & Medical Sciences (AREA)
  • Primary Health Care (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a new energy critical permeability determining method and device based on voltage stability constraint, comprising the following steps: generating a regional sensitive fault set according to the initial running state of the regional power grid, and determining voltage weak nodes; determining the new energy critical permeability of the regional power grid based on static voltage stabilization according to the requirements of the static voltage stability margin and the new energy power fluctuation range; distinguishing a transmitting end power grid and a receiving end power grid in the regional power grid, and determining the critical permeability of the regional power grid based on new energy stable by transient voltage through transient voltage severity indexes; and determining the new energy critical permeability of the regional power grid based on the voltage stability constraint according to the new energy critical permeability based on the static voltage stability and the new energy critical permeability based on the transient voltage stability. The method solves the problem that the voltage of the power grid is unstable along with the rapid increase of the new energy duty ratio at present.

Description

New energy critical permeability determination method and device based on voltage stability constraint
Technical Field
The application relates to the field of power systems, in particular to a new energy critical permeability determining method based on voltage stability constraint, and simultaneously relates to a new energy critical permeability determining device based on voltage stability constraint.
Background
The risk of safe and stable operation of the power grid is increased due to the volatility and randomness of new energy resources, the low disturbance resistance and the weak support of power generation equipment of the new energy resources, and the voltage stability problem is one of key factors. The new energy unit is step-by-step boosted and connected into the power grid, the electric distance between the new energy unit and the main network is 3-5 times that between the new energy unit and the main network, the grid structure is looser, and the voltage stability margin is lower. Although the new energy unit can emit reactive power with a certain capacity during low-voltage ride through, the voltage reactive power supporting capability is far more than that of the conventional unit. With the rapid increase of the new energy duty ratio, partial conventional power supplies are replaced, the short-circuit capacity of the system is reduced, the dynamic reactive power reserve and supporting capacity is weakened, and the problem of voltage stability is outstanding.
Disclosure of Invention
In order to solve the above problems, the present application provides a method for determining critical permeability of new energy based on voltage stability constraint, including:
generating a regional sensitive fault set according to the initial running state of the regional power grid, and determining voltage weak nodes;
determining the new energy critical permeability of the regional power grid based on static voltage stabilization according to the requirements of the static voltage stability margin and the new energy power fluctuation range;
distinguishing a transmitting end power grid and a receiving end power grid in the regional power grid, and determining the critical permeability of the regional power grid based on new energy stable by transient voltage through transient voltage severity indexes;
and determining the new energy critical permeability of the regional power grid based on the voltage stability constraint according to the new energy critical permeability based on the static voltage stability and the new energy critical permeability based on the transient voltage stability.
Preferably, generating the region sensitive fault set according to the initial running state of the regional power grid includes:
according to the load level P included in the initial operating state of the regional power grid L0 The new energy permeability eta, the proportion beta of external power transmission and power reception, the reactive compensation investment condition of each level of transformer substation, the configuration of a reactive compensation device of a new energy station and the low penetration and sum of the new energy stationAnd/or a high penetration control strategy, generating a region sensitive fault set, wherein the fault set comprises: and the three-phase permanent N-1 and/or N-2 faults of the power transmission channel with the power flow approaching the thermal stability limit are generated by the connection section of the regional power grid and the external power grid and the primary and/or secondary section of the direct current transmission or reception.
Preferably, the new energy permeability eta is the proportion of the new energy power generation output of the regional power grid to the total power generation output,
Figure GDA0004239936250000021
P w generating power for new energy, P G Generating power for a conventional power supply;
the ratio of the external power transmission to the power reception
Figure GDA0004239936250000022
P TAC Exchanging power for alternating current channel of regional power grid and external power grid, P TDC Exchanging power for the regional power grid and the external power grid direct current channel.
Preferably, determining the voltage weak node includes:
aiming at a power transmission end power grid, selecting a direct-current converter bus and a new energy machine end bus as voltage weak nodes;
aiming at a receiving end power grid, a load center bus, a direct current converter station bus and a new energy grid-connected bus with the capacity larger than a preset threshold value are selected as voltage weak nodes.
Preferably, the method further comprises:
obtaining the short-circuit capacity S of i of the voltage weak node through calculation i 。
Preferably, determining the critical permeability of the new energy based on static voltage stabilization of the regional power grid according to the requirement of the static voltage stability margin and the new energy power fluctuation range includes:
acquiring a voltage weak node in a load slow-increasing mode, and calculating a static voltage stability margin
Figure GDA0004239936250000023
Wherein P is Lmax Maximum load corresponding to static voltage stability critical pointPower, P L0 Active power for initial load;
adjusting the static voltage stability margin k, and obtaining the first critical permeability eta of the new energy of the regional power grid when k=8% cr1 ；
Obtaining the maximum fluctuation rate lambda of new energy to meet
Figure GDA0004239936250000024
Obtaining a second critical permeability of new energy of the regional power grid>
Figure GDA0004239936250000025
Taking eta cr1 、η cr2 The small value of the two is the new energy critical permeability eta of the regional power grid based on static voltage stabilization Scr ＝min{η cr1 ,η cr2 }。
Preferably, distinguishing a transmitting end power grid and a receiving end power grid in a regional power grid, determining a new energy critical permeability of the regional power grid based on transient voltage stability according to a transient voltage severity index, including:
carrying out transient voltage stability analysis on each fault in the sensitive fault set;
for a power transmission end power grid, transient voltage severity index delta is utilized S Transient overvoltage analysis is performed on voltage weak nodes, wherein
Figure GDA0004239936250000031
U h For maximum bus voltage during fault transient, U max The voltage threshold value is allowed by a direct current converter bus or a new energy machine end bus;
for the receiving end power grid, transient voltage severity index delta is utilized R Transient low voltage analysis of voltage weak nodes, wherein
Figure GDA0004239936250000032
T Vlow T is the duration of the node voltage drop (below 0.8 p.u.) during fault recovery Vmax Is the maximum allowable time;
according to the transient voltage severity index, the new energy permeability is adjusted, and when the transient voltage severity index is equal to 1, the new energy critical permeability eta of the regional power grid new energy based on transient stability is obtained Tcr 。
Preferably, determining the new energy critical permeability of the regional power grid based on the voltage stability constraint according to the new energy critical permeability based on the static voltage stability and the new energy critical permeability based on the transient voltage stability comprises:
taking eta Scr 、η Tcr The small value of the two is the critical permeability eta of the new energy based on the voltage stability constraint of the regional power grid cr ＝min{η Scr ,η Tcr }。
Preferably, the method further comprises:
and (3) adjusting short circuit capacity, the proportion of external power transmission and external power reception, the investment of reactive power compensation of all levels of substations, the configuration of reactive power compensation devices of new energy stations and the low-penetration and/or high-penetration control strategy of the new energy stations, and evaluating the influence characteristics of the parameters on the critical permeability of the new energy based on voltage stability constraint of the regional power grid.
The application provides a new forms of energy critical permeability determining device based on voltage stabilization constraint simultaneously, includes:
the fault set generating unit is used for generating a regional sensitive fault set according to the initial running state of the regional power grid and determining voltage weak nodes;
the new energy critical permeability determining unit is used for determining the new energy critical permeability of the regional power grid based on the static voltage stability according to the requirement of the static voltage stability margin and the new energy power fluctuation range;
the new energy critical permeability determining unit for transient voltage stabilization distinguishes a transmitting end power grid and a receiving end power grid in the regional power grid, and determines the new energy critical permeability of the regional power grid based on the transient voltage stabilization through transient voltage severity indexes;
and the new energy critical permeability determination unit is used for determining the new energy critical permeability of the regional power grid based on the voltage stability constraint according to the new energy critical permeability based on the static voltage stability and the new energy critical permeability based on the transient voltage stability.
According to the new energy critical permeability determining method and device based on the voltage stability constraint, the new energy critical permeability evaluating method based on the voltage stability constraint comprehensively analyzes two aspects of static voltage stability and transient voltage stability, distinguishes transient voltage stability criteria of a power transmission end power grid and a power receiving end power grid, is comprehensive in consideration factor, reasonable in scheme, has good adaptability to different operation conditions and fault modes of the power grid, and solves the problem that the power grid voltage is unstable along with rapid increase of the new energy occupation ratio at present.
Drawings
FIG. 1 is a schematic flow chart of a new energy critical permeability determination method based on voltage stability constraints provided by the present application;
FIG. 2 is a schematic flow chart of a method for determining critical permeability of new energy based on static voltage stabilization for regional power grids according to the present application;
fig. 3 is a flow chart of a method for determining a critical permeability of a new energy source based on transient voltage stabilization of a regional power grid according to the present application;
fig. 4 is a schematic view of power reception outside the regional power grid a to which the present application relates;
fig. 5 is a schematic diagram of a new energy critical permeability determining device based on voltage stability constraint.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other ways than those herein described and similar generalizations can be made by those skilled in the art without departing from the spirit of the application and the application is therefore not limited to the specific embodiments disclosed below.
The application provides a new energy critical permeability determination method based on voltage stability constraint, and the method flow is shown in figure 1 and comprises the following steps.
And step S101, generating a regional sensitive fault set according to the initial running state of the regional power grid, and determining voltage weak nodes.
According to the load level P included in the initial operating state of the regional power grid L0 The method comprises the steps of generating a regional sensitive fault set by a new energy permeability eta, an external power transmission and power receiving proportion beta, reactive compensation investment conditions of all levels of substations, configuration of reactive compensation devices of new energy stations and a low-pass and/or high-pass control strategy of the new energy stations, wherein the fault set comprises: and the three-phase permanent N-1 and/or N-2 faults of the power transmission channel with the power flow approaching the thermal stability limit are generated by the connection section of the regional power grid and the external power grid and the primary and/or secondary section of the direct current transmission or reception.
Wherein the new energy permeability eta is the proportion of the new energy power generation output of the regional power grid to the total power generation output,
Figure GDA0004239936250000051
P w generating power for new energy, P G Generating power for a conventional power supply;
the ratio of the external power transmission to the power reception
Figure GDA0004239936250000052
P TAC Exchanging power for alternating current channel of regional power grid and external power grid, P TDC Exchanging power for the regional power grid and the external power grid direct current channel.
The voltage weak node is used for selecting a direct-current converter bus and a new energy machine end bus as the voltage weak node aiming at a power transmission end power grid; aiming at a receiving end power grid, a load center bus, a direct current converter station bus and a new energy grid-connected bus with the capacity larger than a preset threshold value are selected as voltage weak nodes. And obtaining the short-circuit capacity S of i of the voltage weak node through calculation i 。
And step S102, determining the critical permeability of the new energy based on static voltage stabilization of the regional power grid according to the requirements of the static voltage stability margin and the fluctuation range of the new energy power.
The specific flow is shown in FIG. 2, the voltage weak node under the slow load increasing mode is obtained, and the static voltage stability margin is calculated
Figure GDA0004239936250000053
Wherein P is Lmax Maximum active power of load corresponding to static voltage stability critical point, P L0 Active power for initial load;
the static voltage stability margin k is adjusted, if k is more than 8%, the new energy permeability eta is further improved, if k is less than 8%, the new energy permeability eta is further reduced, and when k=8%, the first critical permeability eta of the new energy of the regional power grid is obtained cr1 ；
Obtaining the maximum fluctuation rate lambda of new energy to meet
Figure GDA0004239936250000054
Obtaining a second critical permeability of new energy of the regional power grid>
Figure GDA0004239936250000055
Taking eta cr1 、η cr2 The small value of the two is the new energy critical permeability eta of the regional power grid based on static voltage stabilization Scr ＝min{η cr1 ,η cr2 }。
Step S103, distinguishing a transmitting end power grid and a receiving end power grid in the regional power grid, and determining the critical permeability of the new energy of the regional power grid based on transient voltage stability through transient voltage severity indexes.
The specific flow is shown in fig. 3. Carrying out transient voltage stability analysis on each fault in the sensitive fault set;
for a power transmission end power grid, transient voltage severity index delta is utilized S Transient overvoltage analysis is performed on voltage weak nodes, wherein
Figure GDA0004239936250000061
U h For maximum bus voltage during fault transient, U max The voltage threshold value is allowed by a direct current converter bus or a new energy machine end bus;
for the receiving end power grid, transient voltage severity index delta is utilized R Transient state is carried out on voltage weak nodesLow voltage analysis in which
Figure GDA0004239936250000062
T Vlow T is the duration of the node voltage drop (below 0.8 p.u.) during fault recovery Vmax Is the maximum allowable time;
according to the transient voltage severity index, the new energy permeability is adjusted, if the transient voltage severity index is larger than 1, the new energy permeability eta is further reduced, if the transient voltage severity index is smaller than 1, the new energy permeability eta is further improved, and when the transient voltage severity index is equal to 1, the new energy critical permeability eta of the regional power grid new energy based on transient stability is obtained Tcr 。
Step S104, determining the new energy critical permeability of the regional power grid based on the voltage stability constraint according to the new energy critical permeability based on the static voltage stability and the new energy critical permeability based on the transient voltage stability.
Taking eta Scr 、η Tcr The small value of the two is the critical permeability eta of the new energy based on the voltage stability constraint of the regional power grid cr ＝min{η Scr ,η Tcr }。
And then, adjusting short-circuit capacity, the proportion of external power transmission and external power reception, the investment of reactive power compensation of all levels of substations, the configuration of reactive power compensation devices of new energy stations and the low-penetration and/or high-penetration control strategy of the new energy stations, and evaluating the influence characteristics of the parameters on the critical permeability of the new energy based on voltage stability constraint of the regional power grid. The adjustment method of each influence factor comprises the following steps:
(1) Short circuit capacity: under the condition of not changing the total power generation output of the conventional power supply of the regional power grid, the starting mode of the conventional power supply in the near region of the voltage weak node i is adjusted to change the short circuit capacity S of the conventional power supply i ；
(2) External power transmission/external power reception ratio: the power output of the conventional power supply of the regional power grid is reduced by pressure, the power output of the external power grid is improved, and the external power transmission proportion is reduced/the external power receiving proportion is increased; the external power transmission proportion is increased/the external power receiving proportion is reduced by improving the conventional power output of the regional power grid and reducing the power output of the external power grid.
(3) Reactive compensation input conditions of all levels of substations: and (3) adjusting static and dynamic reactive compensation input conditions of all levels of substations in the near-area of the voltage weak node. The input condition of reactive compensation has an influence on the initial running voltage of the power grid, and after disturbance occurs, the response characteristics and the running state of the reactive compensation devices have an influence on the voltage stability of the power grid.
(4) The reactive power compensation device of the new energy station is configured: and adjusting the capacity of the reactive power compensation device of the new energy station and the proportion of reactive power compensation devices of different types. The configuration condition of the reactive power compensation device of the new energy station has obvious influence on the voltage level of the new energy unit in steady state operation and the voltage recovery characteristic after the power grid disturbance occurs, and the risk of power grid voltage instability after faults is high when the configuration capacity and the proportion of the reactive power compensation device are unreasonable.
(5) Low-pass/high-pass control strategy for new energy stations: active and reactive control strategies during the entry and exit of the new energy unit into the low-pass/high-pass state are adjusted. Under different control strategies, the reactive support provided by the new energy unit to the power grid is different, and the voltage stability of the power grid is affected.
And when single influencing factors are calculated to adjust, the change condition of the critical permeability of the new energy is calculated, and a reference suggestion is provided for promoting the new energy consumption of the regional power grid.
The preferred embodiments of the specific application are as follows:
the application provides a new energy critical permeability determination method based on voltage stability constraint, which comprises the following steps:
step 1: establishing an initial running state data model of the power grid in the studied area, generating a sensitive fault set in the area, and determining voltage weak nodes;
step 2: determining the new energy critical permeability of the regional power grid based on static voltage stabilization according to the requirements of the static voltage stability margin and the new energy power fluctuation range;
step 3: distinguishing a distribution end power grid and a receiving end power grid, and determining the critical permeability of the new energy source based on transient voltage stabilization of the regional power grid by utilizing a transient voltage severity index;
step 4: and (3) integrating static voltage stabilization and transient voltage stabilization, determining the critical permeability of the new energy based on voltage stability constraint of the regional power grid, and simultaneously considering the influence of factors such as short-circuit capacity of the power grid, external power transmission/external power receiving proportion, reactive compensation input conditions of all levels of substations, configuration of reactive compensation devices of the new energy station, low-pass/high-pass control strategies of the new energy station and the like on the critical permeability of the new energy.
Fig. 4 is a schematic view of the power reception outside the regional power grid a under investigation. AC is an AC power receiving channel and DC is a DC power receiving channel.
The step 1 comprises the following steps:
step 1-1: regional power grid A predicts a certain planned horizontal annual maximum load of 122580MW, and new energy planning permeability of 29.5% (conventional power supply power generation capacity P G 58557MW and new energy power generation capacity P w =24531 MW), the power receiving proportion outside the ac/dc channel is 32%, and a certain reactive compensation input condition of each stage of transformer substation, configuration of a reactive compensation device of the new energy station, and a low-pass/high-pass control strategy of the new energy station are considered. And carrying out load flow calculation on the power grid data model by adopting a Newton-Laportson method so as to obtain an initial operation condition.
Step 1-2: the sensitive fault set includes: the three-phase permanent N-1/N-2 fault of the power transmission channel with the regional power grid and the external power grid, the direct current transmission or receiving primary/secondary section and the power flow approaching the thermal stability limit is realized, wherein if the fault is configured with a safety control measure, the action of the safety control device is considered at the same time.
Step 1-3: the regional power grid A is a receiving end power grid, and a load center (namely heavy load) bus, a direct current converter station bus and a new energy power grid-connected bus with larger capacity are selected as voltage weak nodes. And calculate the short-circuit capacity S of the voltage weak node i i 。
The step 2 comprises the following steps:
step 2-1: and acquiring a PV curve of the voltage weak node in a load slow increasing mode, and calculating a static voltage stability margin k=0.11.
Step 2-2: if k is more than 8%, the new energy permeability eta is further improved. When eta=52%, the static voltage stability margin k=8%, and then a new regional power grid is obtainedFirst critical permeability eta of energy cr1 ＝52％。
Step 2-3: and obtaining the maximum fluctuation rate lambda=20% of the new energy according to the new energy resource condition of the regional power grid. To meet the requirements of
Figure GDA0004239936250000081
Obtaining a second critical permeability of new energy of the regional power grid
Figure GDA0004239936250000082
Step 2-4: taking eta cr1 、η cr2 The smaller one of the two is the new energy critical permeability eta of the regional power grid based on static voltage stabilization Scr ＝min{η cr1 ,η cr2 }＝52％。
The step 3 comprises the following steps:
step 3-1: and carrying out transient voltage stability analysis on each fault in the sensitive fault set.
Step 3-2: for the receiving end power grid A, selecting an alternating current communication channel three-phase permanent N-2 fault with an external power grid as a limiting fault, selecting a load center node as a voltage weak node, and utilizing a transient voltage severity index delta R And carrying out transient low-voltage analysis on the voltage weak node.
Step 3-3: delta when the new energy permeability is 40.5% R =1, obtaining a new energy critical permeability eta of the new energy of the regional power grid a based on transient voltage stabilization Tcr ＝40.5％。
The step 4 comprises the following steps:
step 4-1: taking eta Scr 、η Tcr The smaller of the two is the new energy critical permeability eta of the regional power grid based on voltage stability constraint cr ＝min{η Scr ,η Tcr }＝40.5％。
Step 4-2: and respectively adjusting influence factors such as short-circuit capacity, external power transmission/external power receiving ratio, reactive compensation input conditions of all levels of substations, configuration of reactive compensation devices of the new energy station, low-pass/high-pass control strategies of the new energy station and the like, and evaluating influence characteristics of the factors on the critical permeability of the new energy based on voltage stability constraint of the regional power grid.
Taking the adjustment of the external power receiving proportion as an example, when the external power receiving proportion of the regional power grid is increased to 40%, obtaining the new energy critical permeability eta of the regional power grid A based on the voltage stability constraint according to the steps cr =32.5%. The larger the power receiving proportion outside the regional power grid is, the lower the critical permeability of the new energy is considered, wherein the critical permeability of the new energy is constrained by voltage stability.
Based on the same inventive concept, the present application also provides a new energy critical permeability determining apparatus 500 based on voltage stability constraint, as shown in fig. 5, including:
the fault set generating unit 510 is configured to generate a region sensitive fault set according to an initial running state of the regional power grid, and determine a voltage weak node;
the new energy critical permeability determining unit 520 is configured to determine a new energy critical permeability of the regional power grid based on the static voltage stability according to the requirement of the static voltage stability margin and the new energy power fluctuation range;
the new energy critical permeability determining unit 530 for transient voltage stabilization distinguishes a transmitting end power grid and a receiving end power grid in the regional power grid, and determines the new energy critical permeability of the regional power grid based on transient voltage stabilization through transient voltage severity indexes;
the voltage stability constraint new energy critical permeability determining unit 540 is configured to determine the new energy critical permeability of the regional power grid based on the voltage stability constraint according to the new energy critical permeability based on the static voltage stability and the new energy critical permeability based on the transient voltage stability.
According to the new energy critical permeability determining method and device based on the voltage stability constraint, the new energy critical permeability evaluating method based on the voltage stability constraint comprehensively analyzes two aspects of static voltage stability and transient voltage stability, distinguishes transient voltage stability criteria of a power transmission end power grid and a power receiving end power grid, is comprehensive in consideration factor, reasonable in scheme, has good adaptability to different operation conditions and fault modes of the power grid, and solves the problem that the power grid voltage is unstable along with rapid increase of the new energy occupation ratio at present. Meanwhile, the influence of factors such as short-circuit capacity, external power transmission/external power receiving ratio, reactive compensation input conditions of all levels of substations, reactive compensation device configuration of the new energy station, low-penetration/high-penetration control strategy of the new energy station and the like on the critical permeability of the new energy is fully considered, and an important basis is provided for the maximum consumption of new energy power generation and regional new energy planning.

Claims (8)

1. The new energy critical permeability determination method based on the voltage stability constraint is characterized by comprising the following steps of:
generating a regional sensitive fault set according to the initial running state of the regional power grid, and determining voltage weak nodes;
determining the new energy critical permeability of the regional power grid based on static voltage stabilization according to the requirements of the static voltage stability margin and the new energy power fluctuation range;
distinguishing a transmitting end power grid and a receiving end power grid in a regional power grid, determining the critical permeability of the regional power grid based on new energy of transient voltage stabilization through transient voltage severity indexes, and comprising the following steps:
carrying out transient voltage stability analysis on each fault in the sensitive fault set;
for a power transmission end power grid, transient voltage severity index delta is utilized S Transient overvoltage analysis is performed on voltage weak nodes, wherein
Figure FDA0004239936220000011
U h For maximum bus voltage during fault transient, U max The voltage threshold value is allowed by a direct current converter bus or a new energy machine end bus;
for the receiving end power grid, transient voltage severity index delta is utilized R Transient low voltage analysis of voltage weak nodes, wherein
Figure FDA0004239936220000012
T Vlow Is too much recovered for failureThe duration of the drop in node voltage (below 0.8 p.u.), T Vmax Is the maximum allowable time;
according to the transient voltage severity index, the new energy permeability is adjusted, and when the transient voltage severity index is equal to 1, the new energy critical permeability eta of the regional power grid new energy based on transient stability is obtained Tcr ；
According to the new energy critical permeability based on static voltage stabilization and the new energy critical permeability based on transient voltage stabilization, determining the new energy critical permeability of the regional power grid based on voltage stabilization constraint comprises the following steps:
taking eta Scr 、η Tcr The small value of the two is the critical permeability eta of the new energy based on the voltage stability constraint of the regional power grid cr ＝min{η Scr ,η Tcr }。
2. The method of determining of claim 1, wherein generating the regional sensitive fault set based on the regional power grid initial operating state comprises:
according to the load level P included in the initial operating state of the regional power grid L0 The method comprises the steps of generating a regional sensitive fault set by a new energy permeability eta, an external power transmission and power receiving proportion beta, reactive compensation investment conditions of all levels of substations, configuration of reactive compensation devices of new energy stations and a low-pass and/or high-pass control strategy of the new energy stations, wherein the fault set comprises: and the three-phase permanent N-1 and/or N-2 faults of the power transmission channel with the power flow approaching the thermal stability limit are generated by the connection section of the regional power grid and the external power grid and the primary and/or secondary section of the direct current transmission or reception.
3. The method according to claim 2, wherein the new energy permeability η is a ratio of the generated power of the new energy of the regional power grid to the generated power of the total power supply,
Figure FDA0004239936220000021
P w generating power for new energy, P G Generating power for a conventional power supply;
the external power transmissionRatio to power receiving
Figure FDA0004239936220000022
P TAC Exchanging power for alternating current channel of regional power grid and external power grid, P TDC Exchanging power for the regional power grid and the external power grid direct current channel.
4. The method of determining of claim 1, wherein determining the voltage weak node comprises:
aiming at a power transmission end power grid, selecting a direct-current converter bus and a new energy machine end bus as voltage weak nodes;
aiming at a receiving end power grid, a load center bus, a direct current converter station bus and a new energy grid-connected bus with the capacity larger than a preset threshold value are selected as voltage weak nodes.
5. The determination method according to claim 1, characterized by further comprising:
obtaining the short-circuit capacity S of i of the voltage weak node through calculation i 。
6. A method of determining according to claim 3, wherein determining the critical permeability of the utility grid based on the new energy source for static voltage stabilization based on the requirements of the static voltage stability margin and the new energy source power fluctuation range comprises:
acquiring a voltage weak node in a load slow-increasing mode, and calculating a static voltage stability margin
Figure FDA0004239936220000023
Wherein P is Lmax Maximum active power of load corresponding to static voltage stability critical point, P L0 Active power for initial load;
adjusting the static voltage stability margin k, and obtaining the first critical permeability eta of the new energy of the regional power grid when k=8% cr1 ；
Obtaining the maximum fluctuation rate lambda of new energy to meet
Figure FDA0004239936220000024
Obtaining a second critical permeability of new energy of the regional power grid>
Figure FDA0004239936220000025
Taking eta cr1 、η cr2 The small value of the two is the new energy critical permeability eta of the regional power grid based on static voltage stabilization Scr ＝min{η cr1 ,η cr2 }。
7. The determination method according to claim 1, characterized by further comprising:
and (3) adjusting short circuit capacity, the proportion of external power transmission and external power reception, the investment of reactive power compensation of all levels of substations, the configuration of reactive power compensation devices of new energy stations and the influence factors of low-penetration and/or high-penetration control strategies of the new energy stations, and evaluating the influence characteristics of the influence factors on the critical permeability of the new energy based on voltage stability constraint of the regional power grid.
8. A new energy critical permeability determining device based on voltage stability constraint, characterized by comprising:
the fault set generating unit is used for generating a regional sensitive fault set according to the initial running state of the regional power grid and determining voltage weak nodes;
the new energy critical permeability determining unit is used for determining the new energy critical permeability of the regional power grid based on the static voltage stability according to the requirement of the static voltage stability margin and the new energy power fluctuation range;
the new energy critical permeability determining unit for transient voltage stabilization distinguishes a transmitting end power grid and a receiving end power grid in a regional power grid, determines the new energy critical permeability of the regional power grid based on transient voltage stabilization through transient voltage severity indexes, and comprises the following steps:
carrying out transient voltage stability analysis on each fault in the sensitive fault set;
for the power grid at the transmitting end, benefitUsing transient voltage severity index delta S Transient overvoltage analysis is performed on voltage weak nodes, wherein
Figure FDA0004239936220000031
U h For maximum bus voltage during fault transient, U max The voltage threshold value is allowed by a direct current converter bus or a new energy machine end bus;
for the receiving end power grid, transient voltage severity index delta is utilized R Transient low voltage analysis of voltage weak nodes, wherein
Figure FDA0004239936220000032
T Vlow T is the duration of the node voltage drop (below 0.8 p.u.) during fault recovery Vmax Is the maximum allowable time;
according to the transient voltage severity index, the new energy permeability is adjusted, and when the transient voltage severity index is equal to 1, the new energy critical permeability eta of the regional power grid new energy based on transient stability is obtained Tcr ；
The new energy critical permeability determining unit of the voltage stability constraint is configured to determine a new energy critical permeability of the regional power grid based on the voltage stability constraint according to the new energy critical permeability based on the static voltage stability and the new energy critical permeability based on the transient voltage stability, and includes:
taking eta Scr 、η Tcr The small value of the two is the critical permeability eta of the new energy based on the voltage stability constraint of the regional power grid cr ＝min{η Scr ,η Tcr }。
CN202110401105.8A 2021-04-14 2021-04-14 New energy critical permeability determination method and device based on voltage stability constraint Active CN113241801B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110401105.8A CN113241801B (en) 2021-04-14 2021-04-14 New energy critical permeability determination method and device based on voltage stability constraint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110401105.8A CN113241801B (en) 2021-04-14 2021-04-14 New energy critical permeability determination method and device based on voltage stability constraint

Publications (2)

Publication Number Publication Date
CN113241801A CN113241801A (en) 2021-08-10
CN113241801B true CN113241801B (en) 2023-06-30

Family

ID=77128269

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110401105.8A Active CN113241801B (en) 2021-04-14 2021-04-14 New energy critical permeability determination method and device based on voltage stability constraint

Country Status (1)

Country Link
CN (1) CN113241801B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115912384B (en) * 2022-12-21 2024-05-28 国网湖北省电力有限公司经济技术研究院 Method for improving voltage stability of extra-high voltage direct current receiving end system containing high proportion new energy
CN116599162B (en) * 2023-07-19 2023-09-15 昆明理工大学 Method for determining new energy permeability under N-1
CN117955178B (en) * 2024-03-26 2024-06-04 四川大学 Thermal power starting and output configuration method suitable for large-scale wind power direct current end system

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103996149A (en) * 2014-05-30 2014-08-20 国家电网公司 Method for analyzing wind power layout of regional power grid based on quiescent voltage stability
WO2014173081A1 (en) * 2013-04-27 2014-10-30 国家电网公司 Optimization control method for reactive voltage of wind farm cluster
CN104882905A (en) * 2015-03-30 2015-09-02 国电南瑞科技股份有限公司 New energy available capability assessment method considering transient security constraints
CN105207221A (en) * 2015-09-07 2015-12-30 国网天津市电力公司 Method for enhancing power grid voltage stability under situation of high-proportion external power receiving
WO2017084404A1 (en) * 2015-11-20 2017-05-26 中国电力科学研究院 Method for estimating grid wind power sending capability allowing for wind farm off the system constraint
CN107919666A (en) * 2017-12-07 2018-04-17 贵州电网有限责任公司电力科学研究院 A kind of area power grid transient stability based on wide area response is in line generalization pre-judging method
CN108418255A (en) * 2018-03-01 2018-08-17 中国电力科学研究院有限公司 A kind of extra-high voltage direct-current suitable for the new energy containing high permeability sends Electric power network planning method and system outside
CN108711867A (en) * 2018-04-23 2018-10-26 广州供电局有限公司 It is a kind of meter and Voltage Stability Constraints the idle planing method of power distribution network
CN111446721A (en) * 2020-04-07 2020-07-24 武汉大学 Power distribution network voltage regulation control method based on transient voltage sensitivity
CN111537839A (en) * 2020-06-10 2020-08-14 河海大学 Transient voltage safety evaluation method and system suitable for high-proportion new energy transmission end power grid
CN111541280A (en) * 2020-05-14 2020-08-14 东南大学 Power grid wind power maximum permeability evaluation method considering static voltage stability constraint
CN112072715A (en) * 2020-09-17 2020-12-11 国电南瑞科技股份有限公司 Method and device for determining new energy acceptance of power grid in consideration of transient voltage constraint

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014173081A1 (en) * 2013-04-27 2014-10-30 国家电网公司 Optimization control method for reactive voltage of wind farm cluster
CN103996149A (en) * 2014-05-30 2014-08-20 国家电网公司 Method for analyzing wind power layout of regional power grid based on quiescent voltage stability
CN104882905A (en) * 2015-03-30 2015-09-02 国电南瑞科技股份有限公司 New energy available capability assessment method considering transient security constraints
CN105207221A (en) * 2015-09-07 2015-12-30 国网天津市电力公司 Method for enhancing power grid voltage stability under situation of high-proportion external power receiving
WO2017084404A1 (en) * 2015-11-20 2017-05-26 中国电力科学研究院 Method for estimating grid wind power sending capability allowing for wind farm off the system constraint
CN107919666A (en) * 2017-12-07 2018-04-17 贵州电网有限责任公司电力科学研究院 A kind of area power grid transient stability based on wide area response is in line generalization pre-judging method
CN108418255A (en) * 2018-03-01 2018-08-17 中国电力科学研究院有限公司 A kind of extra-high voltage direct-current suitable for the new energy containing high permeability sends Electric power network planning method and system outside
CN108711867A (en) * 2018-04-23 2018-10-26 广州供电局有限公司 It is a kind of meter and Voltage Stability Constraints the idle planing method of power distribution network
CN111446721A (en) * 2020-04-07 2020-07-24 武汉大学 Power distribution network voltage regulation control method based on transient voltage sensitivity
CN111541280A (en) * 2020-05-14 2020-08-14 东南大学 Power grid wind power maximum permeability evaluation method considering static voltage stability constraint
CN111537839A (en) * 2020-06-10 2020-08-14 河海大学 Transient voltage safety evaluation method and system suitable for high-proportion new energy transmission end power grid
CN112072715A (en) * 2020-09-17 2020-12-11 国电南瑞科技股份有限公司 Method and device for determining new energy acceptance of power grid in consideration of transient voltage constraint

Non-Patent Citations (9)

* Cited by examiner, † Cited by third party
Title
Study on the Impact of Under Voltage Ride Through Charactertics of Larger PV Penetrations on the System Transient Stability;S.RajaMohamed等;《2017 International Conference on Advanced Computing and Communication Systems》;全文 *
受静态电压稳定约束的新能源临界渗透率计算方法;易俊;林伟芳;余芳芳;林安妮;杨帆;;《电网技术》;第44卷(第8期);第2906-2912页 *
含风电场的受端系统暂态电压稳定性评估;李东东等;《电力系统保护与控制》;第43卷(第13期);第8-14页 *
国家能源局.《电力系统安全稳定计算基数规范》.2013,第14-15页. *
基于区间估计的风电出力多场景下静态电压安全域研究;刘文颖;徐鹏;赵子兰;刘福潮;许园园;;电工技术学报(第03期);第172-178页 *
湖南电网暂态电压稳定薄弱点识别;左剑;张斌;周年光;呙虎;向萌;;《湖南电力》(第01期);第27-34页 *
王鹤奇 ; .大规模风电并网地区的电网安全稳定分析.《黑龙江电力》.2013,(第6期),第526-528页. *
超高占比新能源电网的电压稳定性及暂态过电压抑制措施研究;林安妮;《华北电力大学》;全文 *
适用于大规模新能源接入直流送端电网的暂态压升严重性指标研究;赵晋泉等;《南方电网技术》;第14卷(第12期);第1-9页 *

Also Published As

Publication number Publication date
CN113241801A (en) 2021-08-10

Similar Documents

Publication Publication Date Title
CN113241801B (en) New energy critical permeability determination method and device based on voltage stability constraint
CN108418255B (en) Planning method and system suitable for extra-high voltage direct current outgoing power grid containing high-permeability new energy
Ma et al. Optimal allocation of hybrid energy storage systems for smoothing photovoltaic power fluctuations considering the active power curtailment of photovoltaic
JP4654416B2 (en) Distribution system voltage regulation system
CN111953013A (en) Self-adaptive optimization regulation and control method under fault of true bipolar flexible direct-current transmission system
CN108493985B (en) Identification method for out-of-limit weak link of voltage of power distribution network containing distributed power supply
CN109713717B (en) Photovoltaic voltage coordination control method for power distribution network
CN109617112B (en) Improved direct-current voltage control strategy applicable to multi-terminal flexible direct-current system
CN114447984A (en) Low-voltage ride-through control method suitable for offshore wind power collection line fault and application
CN104269854A (en) Voltage control method based on direct current inverter station stability measurement indexes
CN108964120B (en) Low-voltage distributed photovoltaic access capacity optimization control method
CN105262077B (en) A kind of control method for optimizing DC distribution net trend
CN107578118B (en) Optimization method and device for switching strategy of filter of direct-current power transmission system
CN106972518B (en) Access mode selection method for direct-current (DC) delivery system of small local power grid and energy base
CN105977992B (en) It is a kind of to change the distribution system that intelligence adjusts idle output based on load
WO2017199462A1 (en) Current/voltage control system
Pippi et al. Assessing the provision of ancillary services considering BES capacity degradation
CN109301833B (en) AC/DC series-parallel power grid power transmission section overload control method based on path stripping
Ye et al. Improved droop control strategy for an MMC-MTDC connected to offshore wind farms with dynamic correction of the actual operating point
CN110148968B (en) Fault recovery control method for photovoltaic direct-current grid-connected system
CN109950909B (en) AVC system optimization control method based on real-time power flow algorithm
CN112600260A (en) Transient voltage sensitivity sequencing-based unit difference adjustment coefficient optimization method and device
CN114844130A (en) Phase modulator optimal configuration method and system for improving voltage intensity of power grid
CN113315140A (en) Offshore wind power reactive compensation coordination control method
Lin et al. Coordinated power control strategy of voltage source converter‐based multiterminal high‐voltage direct current based on the voltage‐current curve

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant