CN113241801A - 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

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CN113241801A
CN113241801A CN202110401105.8A CN202110401105A CN113241801A CN 113241801 A CN113241801 A CN 113241801A CN 202110401105 A CN202110401105 A CN 202110401105A CN 113241801 A CN113241801 A CN 113241801A
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赵伟
李晓珺
李付强
唐晓骏
潘艳
李晶
徐鹏
吉平
董烨
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China Electric Power Research Institute Co Ltd CEPRI
North China Grid Co Ltd
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Abstract

The invention discloses a method and a device for determining the critical permeability of new energy based on voltage stability constraint, wherein the method comprises the following steps: generating a regional sensitive fault set according to the initial operation state of a regional power grid, and determining weak voltage nodes; determining the new energy critical permeability of the regional power grid based on static voltage stability according to the requirement 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, and determining the critical permeability of the regional power grid based on the transient voltage stability of the new energy through a transient voltage severity index; and determining the critical permeability of the new energy based on the voltage stability constraint of the regional power grid according to the critical permeability of the new energy based on the static voltage stability and the critical permeability of the new energy based on the transient voltage stability. The problem of at present with the new forms of energy account for the ratio improve fast, grid voltage is unstable is solved.

Description

New energy critical permeability determination method and device based on voltage stability constraint
Technical Field
The application relates to the field of electric power systems, in particular to a new energy critical permeability determining method based on voltage stability constraint, and also relates to a new energy critical permeability determining device based on voltage stability constraint.
Background
Due to the fluctuation and randomness of new energy resources and the low immunity and weak support of power generation equipment, the risk of safe and stable operation of a power grid is increased, and the problem of voltage stability is one of the key factors. Because the new energy unit is stepped up step by step and is connected into the power grid, the electrical distance between the new energy unit and the main grid is 3-5 times that between the new energy unit and the main grid, the grid structure is looser, and the voltage stability margin is lower. Although the new energy unit can generate a certain amount of reactive power during low-voltage ride through, the voltage reactive support capability of the new energy unit is far more than that of the conventional unit. With the rapid improvement of the new energy ratio, a part of conventional power supplies are replaced, the short-circuit capacity of the system is reduced, the dynamic reactive power storage and supporting capacity is weakened, and the problem of voltage stability is obvious.
Disclosure of Invention
In order to solve the above problem, the present application provides a method for determining a critical permeability of a new energy based on voltage stability constraint, including:
generating a regional sensitive fault set according to the initial operation state of a regional power grid, and determining weak voltage nodes;
determining the new energy critical permeability of the regional power grid based on static voltage stability according to the requirement 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, and determining the critical permeability of the regional power grid based on the transient voltage stability of the new energy through a transient voltage severity index;
and determining the critical permeability of the new energy based on the voltage stability constraint of the regional power grid according to the critical permeability of the new energy based on the static voltage stability and the critical permeability of the new energy based on the transient voltage stability.
Preferably, the generating of the regional sensitive fault set according to the initial operating state of the regional power grid includes:
according to the load level P included by the initial operation state of the regional power gridL0The method comprises the following steps of generating a regional sensitive fault set by using a new energy permeability eta, an external power transmission and receiving ratio beta, reactive compensation input conditions of all levels of transformer substations, reactive compensation device configuration of a new energy station, low-penetration and/or high-penetration control strategies of the new energy station, wherein the fault set comprises the following steps: and the three-phase permanent N-1 and/or N-2 faults of the communication section of the regional power grid and the external power grid, the direct current output or input of the regional power grid into the primary and/or secondary section and the power flow close to the thermal stability limit transmission channel.
Preferably, the new energy permeability eta is the proportion of the new energy generated output of the regional power grid to the total power generated output,
Figure BDA0003020351980000021
Pwfor new energy generationGGenerating power for a conventional power supply;
the ratio of external power transmission to power reception
Figure BDA0003020351980000022
PTACExchanging power, P, for a local network with an external network AC channelTDCAnd exchanging power for the direct current channel of the regional power grid and the external power grid.
Preferably, the determining the voltage weak node includes:
aiming at a sending end power grid, a direct current conversion bus and a new energy machine end bus are selected as weak voltage nodes;
and aiming at a receiving-end power grid, selecting 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 as a voltage weak node.
Preferably, the method further comprises the following steps:
obtaining the short-circuit capacity S of the voltage weak node i through calculationi。
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 power fluctuation range of the new energy, and the determining comprises the following steps:
acquiring weak voltage nodes in a load slow increase mode, and calculating static voltage stability margin
Figure BDA0003020351980000023
Wherein P isLmaxMaximum active power of load, P, corresponding to quiescent voltage stability critical pointL0Active power for the initial load;
adjusting the static voltage stability margin k, and when k is 8%, obtaining a first critical permeability eta of the new energy of the regional power gridcr2；
Obtaining the maximum fluctuation rate lambda of the new energy to meet
Figure BDA0003020351980000024
Obtaining the second critical permeability of the new energy of the regional power grid
Figure BDA0003020351980000025
Get etacr1、ηcr2New energy critical permeability eta with small numerical value and based on static voltage stabilization for regional power gridScr＝min{ηcr1,ηcr2}。
Preferably, distinguishing a transmitting-end power grid and a receiving-end power grid in a regional power grid, and determining the critical permeability of the regional power grid based on the transient voltage stability through a transient voltage severity index, includes:
performing transient voltage stability analysis on each fault in the sensitive fault set;
aiming at a sending end power grid, a transient state electricity serious index delta is utilizedSPerforming transient overvoltage analysis on the weak voltage node, wherein
Figure BDA0003020351980000031
UhFor maximum bus voltage during fault transients, UmaxThe voltage threshold value is allowed by a direct current conversion bus or a new energy machine end bus;
aiming at a receiving-end power grid, a transient state electricity severity index delta is utilizedRPerforming a transient low voltage analysis on the voltage weak node, wherein
Figure BDA0003020351980000032
TVlowDuration of node voltage drop (below 0.8p.u.) during fault recovery, TVmaxIs the maximum allowable time;
according to the transient voltage severity index, the permeability of the new energy is adjusted, and when the transient voltage severity index is equal to 1, the transient stability-based new energy critical permeability eta of the new energy of the regional power grid is obtainedTcr。
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 includes:
get etaScr、ηTcrSmall-value new energy critical permeability eta of regional power grid based on voltage stability constraintcr＝min{ηScr,ηTcr}。
Preferably, the method further comprises the following steps:
adjusting short circuit capacity, external power transmission and external power receiving proportion, reactive compensation investment of all levels of transformer substations, new energy station reactive compensation device configuration, and low-penetration and/or high-penetration control strategies of the new energy station, 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.
This application provides a new forms of energy critical permeability confirming device based on voltage stabilization constraint simultaneously, includes:
the fault set generation unit is used for generating a regional sensitive fault set according to the initial operation state of the regional power grid and determining a voltage weak node;
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 transient voltage stabilization new energy critical permeability determining unit is used for distinguishing a transmitting end power grid and a receiving end power grid in a regional power grid, and determining the transient voltage stabilization-based new energy critical permeability of the regional power grid according to a transient voltage severity index;
and the voltage stability constraint new energy critical permeability determining unit is used for determining the voltage stability constraint new energy critical permeability of the regional power grid according to the static voltage stability-based new energy critical permeability and the transient voltage stability-based new energy critical permeability.
According to the new energy critical permeability determining method and device based on voltage stability constraint, comprehensive analysis is conducted on static voltage stability and transient voltage stability, transient voltage stability criteria of a sending-end power grid and a receiving-end power grid are distinguished, consideration factors are comprehensive, the scheme is reasonable, good adaptability is achieved for different operation conditions and fault forms of the power grid, and the problem that the power grid voltage is unstable along with rapid improvement of new energy occupation ratio at present is solved.
Drawings
Fig. 1 is a schematic flow chart of a new energy critical permeability determination method based on voltage stability constraint provided by the present application;
fig. 2 is a schematic flow chart of a determination method of critical permeability of new energy based on static voltage stabilization for a regional power grid according to the present application;
fig. 3 is a schematic flow chart of a determination method of critical permeability of new energy based on transient voltage stabilization for a regional power grid according to the present application;
fig. 4 is an external power receiving schematic diagram of a regional power grid a to which the present application relates;
fig. 5 is a schematic diagram of a new energy critical permeability determination apparatus based on voltage stability constraint according to the present application.
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 capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
The application provides a new energy critical permeability determination method based on voltage stability constraint, and the method flow is shown in fig. 1 and includes the following steps.
And S101, generating a regional sensitive fault set according to the initial operation state of the regional power grid, and determining a voltage weak node.
According to the load level P included by the initial operation state of the regional power gridL0The method comprises the following steps of generating a regional sensitive fault set by using a new energy permeability eta, an external power transmission and receiving ratio beta, reactive compensation input conditions of all levels of transformer substations, reactive compensation device configuration of a new energy station, low-penetration and/or high-penetration control strategies of the new energy station, wherein the fault set comprises the following steps: and the three-phase permanent N-1 and/or N-2 faults of the communication section of the regional power grid and the external power grid, the direct current output or input of the regional power grid into the primary and/or secondary section and the power flow close to the thermal stability limit transmission channel.
Wherein the new energy permeability eta is the proportion of the new energy generated output of the regional power grid to the total power generated output,
Figure BDA0003020351980000051
Pwfor new energy generationGGenerating power for a conventional power supply;
the ratio of external power transmission to power reception
Figure BDA0003020351980000052
PTACExchanging power, P, for a local network with an external network AC channelTDCAnd exchanging power for the direct current channel of the regional power grid and the external power grid.
The voltage weak node is formed by selecting a direct current conversion bus and a new energy machine end bus as the voltage weak node aiming at a sending end power grid; and aiming at a receiving-end power grid, selecting 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 as a voltage weak node. And obtaining the short-circuit capacity S of the voltage weak node i through calculationi。
And S102, 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 power fluctuation range of the new energy.
The specific flow is shown in fig. 2, the weak voltage node under the load slow increase mode is obtained, and the static voltage stability margin is calculated
Figure BDA0003020351980000053
Wherein P isLmaxMaximum active power of load, P, corresponding to quiescent voltage stability critical pointL0Active power for the initial load;
adjusting the static voltage stability margin k, if k is larger than 8%, further improving the new energy permeability eta, if k is smaller than 8%, further reducing the new energy permeability eta, and when k is 8%, obtaining the first critical permeability eta of the new energy of the regional power gridcr2；
Obtaining the maximum fluctuation rate lambda of the new energy to meet
Figure BDA0003020351980000054
Obtaining the second critical permeability of the new energy of the regional power grid
Figure BDA0003020351980000055
Get etacr1、ηcr2New energy critical permeability eta with small numerical value and based on static voltage stabilization for regional power gridScr＝min{ηcr1,ηcr2}。
And 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 regional power grid based on the transient voltage stability through the transient voltage severity index.
The specific flow is shown in fig. 3. Performing transient voltage stability analysis on each fault in the sensitive fault set;
aiming at a sending end power grid, a transient state electricity serious index delta is utilizedSPerforming transient overvoltage analysis on the weak voltage node, wherein
Figure BDA0003020351980000061
UhFor maximum bus voltage during fault transients, UmaxThe voltage threshold value is allowed by a direct current conversion bus or a new energy machine end bus;
aiming at a receiving-end power grid, a transient state electricity severity index delta is utilizedRPerforming a transient low voltage analysis on the voltage weak node, wherein
Figure BDA0003020351980000062
TVlowDuration of node voltage drop (below 0.8p.u.) during fault recovery, TVmaxIs 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 obtainedTcr。
And step S104, determining the new energy critical permeability of the regional power grid based on voltage stability constraint according to the new energy critical permeability based on static voltage stability and the new energy critical permeability based on transient voltage stability.
Get etaScr、ηTcrSmall-value new energy critical permeability eta of regional power grid based on voltage stability constraintcr＝min{ηScr,ηTcr}。
And then, adjusting short circuit capacity, the proportion of external power transmission and external power reception, the reactive compensation investment of all levels of transformer substations, the configuration of a reactive compensation device of the new energy station, and a low-penetration and/or high-penetration control strategy of the new energy station, 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 adjusting method of each influencing factor is as follows:
(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 region near the weak voltage node i is adjusted to change the short-circuit capacity S of the conventional power supplyi；
(2) External power transmission/external power reception ratio: reducing the external power transmission proportion/increasing the external power receiving proportion by reducing the conventional power output of the regional power grid and improving the power output of the external power grid; the external power transmission proportion is increased/reduced by increasing the conventional power output of the regional power grid and reducing the power output of the external power grid.
(3) The reactive compensation input condition of each stage of transformer substation is as follows: and adjusting the static and dynamic reactive compensation input conditions of all levels of transformer substations in the vicinity of the voltage weak node. The reactive compensation input condition influences the initial operation voltage of the power grid, and after disturbance occurs, the response characteristics and the operation state of the reactive compensation devices influence the voltage stability of the power grid.
(4) The reactive power compensation device of the new energy station is configured as follows: and adjusting the capacity of the reactive compensation device of the new energy station and the proportion of different types of reactive compensation devices. 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 operation and the voltage recovery characteristic after power grid disturbance, and when the configuration capacity and the proportion of the reactive power compensation device are unreasonable, the risk of power grid voltage instability after fault is high.
(5) The low-penetration/high-penetration control strategy of the new energy station comprises the following steps: and adjusting active and reactive control strategies during the entering and exiting of the low-penetration/high-penetration state of the new energy source unit. 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 influenced.
And when the single influence factor is adjusted, 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 embodiment for the specific application is 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 a data model of the initial operation state of the power grid of the region to be researched, generating a sensitive fault set in the region, and determining weak voltage nodes;
step 2: determining the new energy critical permeability of the regional power grid based on static voltage stability according to the requirement of the static voltage stability margin and the new energy power fluctuation range;
and step 3: distinguishing a transmitting-end power grid and a receiving-end power grid, and determining the transient voltage stability-based new energy critical permeability of a regional power grid by using a transient voltage severity index;
and 4, step 4: and integrating static voltage stability and transient voltage stability, determining the critical permeability of the new energy based on voltage stability constraint of the regional power grid, and considering the influence of factors such as short circuit capacity of the power grid, external power transmission/external power receiving proportion, reactive power compensation input conditions of all levels of transformer substations, reactive power 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.
Fig. 4 is an external power receiving schematic diagram of the power grid a of the studied area. AC is an alternating current power receiving channel, and DC is a direct current power receiving channel.
The step 1 comprises the following steps:
step 1-1: the regional power grid A predicts the maximum load of 122580MW at a certain planned level year and the planned permeability of the new energy is 29.5% (the power generated by the conventional power supply is output P)GGenerating power P by new energy source at 58557MWw245731 MW), the external power receiving rate of the AC/DC channel is 32%, consider oneAnd determining the reactive compensation input condition of each stage of transformer substation, the configuration of a reactive compensation device of the new energy station and a low-penetration/high-penetration control strategy of the new energy station. And carrying out load flow calculation on the power grid data model by adopting a Newton-Raphson method to obtain an initial operation condition.
Step 1-2: the set of sensitive faults includes: the three-phase permanent N-1/N-2 fault of a regional power grid and external power grid connection section, direct current output or input of the regional power grid and a primary/secondary section and a power flow close to a thermal stability limit power transmission channel is adopted, wherein if the fault is provided with a safety control measure, the action of a 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 a heavier load) bus, a direct-current converter station bus and a new energy power grid-connected bus with larger capacity are selected as weak voltage nodes. And calculating and solving the short-circuit capacity S of the weak voltage node ii。
The step 2 comprises the following steps:
step 2-1: and acquiring a PV curve of a voltage weak node in a load slow-increase mode, and calculating the static voltage stability margin k to be 0.11.
Step 2-2: and if k is more than 8%, further improving the new energy permeability eta. When eta is 52%, the static voltage stability margin k is 8%, and then the first critical permeability eta of the new energy of the regional power grid is obtainedcr1＝52％。
Step 2-3: and acquiring the maximum fluctuation rate lambda of the new energy as 20% according to the new energy resource condition of the regional power grid. To satisfy
Figure BDA0003020351980000081
Obtaining the second critical permeability of the new energy of the regional power grid
Figure BDA0003020351980000082
Step 2-4: get etacr1、ηcr2The smaller of the two is the critical permeability eta of the new energy based on static voltage stabilization of the regional power gridScr＝min{ηcr1,ηcr2}＝52％。
The step 3 comprises the following steps:
step 3-1: transient voltage stability analysis is performed for each fault in the set of sensitive faults.
Step 3-2: for a receiving-end power grid A, selecting a three-phase permanent N-2 fault of an alternating current communication channel 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 deltaRAnd carrying out transient low-voltage analysis on the voltage weak nodes.
Step 3-3: delta when the new energy permeability is 40.5 percentRObtaining the critical permeability eta of the new energy of the regional power grid A based on transient voltage stabilityTcr＝40.5％。
The step 4 comprises the following steps:
step 4-1: get etaScr、ηTcrThe smaller of the two is the critical permeability eta of the new energy based on the voltage stability constraint of the regional power gridcr＝min{ηScr,ηTcr}＝40.5％。
Step 4-2: and respectively adjusting the short circuit capacity, the external power transmission/external power receiving ratio, reactive compensation input conditions of all levels of transformer substations, the configuration of a reactive compensation device of the new energy station, a low-penetration/high-penetration control strategy of the new energy station and other influencing factors, and evaluating the influencing 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%, the critical permeability eta of the regional power grid A based on the voltage stability constraint new energy is obtained according to the stepscr32.5%. The larger the external power receiving proportion of the regional power grid is, the lower the critical permeability of the new energy considering the voltage stability constraint is.
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 regional sensitive fault set according to an initial operating state of a regional power grid, and determine a voltage weak node;
the new energy critical permeability determining unit 520 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 transient voltage stabilization new energy critical permeability determining unit 530 distinguishes a sending end power grid and a receiving end power grid in a regional power grid, and determines the transient voltage stabilization-based new energy critical permeability of the regional power grid according to a transient voltage severity index;
and the voltage stability constraint new energy critical permeability determining unit 540 is configured to determine, according to the static voltage stability-based new energy critical permeability and the transient voltage stability-based new energy critical permeability, a voltage stability constraint-based new energy critical permeability of the regional power grid.
According to the new energy critical permeability determining method and device based on voltage stability constraint, comprehensive analysis is conducted on static voltage stability and transient voltage stability, transient voltage stability criteria of a sending-end power grid and a receiving-end power grid are distinguished, consideration factors are comprehensive, the scheme is reasonable, good adaptability is achieved for different operation conditions and fault forms of the power grid, and the problem that the power grid voltage is unstable along with rapid improvement of new energy occupation ratio at present is solved. 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 transformer 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 maximum consumption of new energy power generation and regional new energy planning.

Claims (10)

1. A new energy critical permeability determination method based on voltage stability constraint is characterized by comprising the following steps:
generating a regional sensitive fault set according to the initial operation state of a regional power grid, and determining weak voltage nodes;
determining the new energy critical permeability of the regional power grid based on static voltage stability according to the requirement 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, and determining the critical permeability of the regional power grid based on the transient voltage stability of the new energy through a transient voltage severity index;
and determining the critical permeability of the new energy based on the voltage stability constraint of the regional power grid according to the critical permeability of the new energy based on the static voltage stability and the critical permeability of the new energy based on the transient voltage stability.
2. The method of claim 1, wherein generating a set of locale sensitive faults based on the initial operating state of the locale power grid comprises:
according to the load level P included by the initial operation state of the regional power gridL0The method comprises the following steps of generating a regional sensitive fault set by using a new energy permeability eta, an external power transmission and receiving ratio beta, reactive compensation input conditions of all levels of transformer substations, reactive compensation device configuration of a new energy station, low-penetration and/or high-penetration control strategies of the new energy station, wherein the fault set comprises the following steps: and the three-phase permanent N-1 and/or N-2 faults of the communication section of the regional power grid and the external power grid, the direct current output or input of the regional power grid into the primary and/or secondary section and the power flow close to the thermal stability limit transmission channel.
3. The determination method according to claim 2, wherein the new energy permeability η is a ratio of the area grid new energy generated output to the total power supply generated output,
Figure FDA0003020351970000011
Pwfor new energy generationGGenerating power for a conventional power supply;
the ratio of external power transmission to power reception
Figure FDA0003020351970000012
PTACExchanging power, P, for a local network with an external network AC channelTDCExchanging power for DC channel of regional power grid and external power gridAnd (4) rate.
4. The method of claim 1, wherein determining a voltage weak node comprises:
aiming at a sending end power grid, a direct current conversion bus and a new energy machine end bus are selected as weak voltage nodes;
and aiming at a receiving-end power grid, selecting 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 as a voltage weak node.
5. The determination method according to claim 1, further comprising:
obtaining the short-circuit capacity S of the voltage weak node i through calculationi。
6. The determination method according to claim 1, wherein determining the critical permeability of the new energy based on the static voltage stabilization of the regional power grid according to the requirement of the static voltage stabilization margin and the power fluctuation range of the new energy comprises:
acquiring weak voltage nodes in a load slow increase mode, and calculating static voltage stability margin
Figure FDA0003020351970000021
Wherein P isLmaxMaximum active power of load, P, corresponding to quiescent voltage stability critical pointL0Active power for the initial load;
adjusting the static voltage stability margin k, and when k is 8%, obtaining a first critical permeability eta of the new energy of the regional power gridcr2；
Obtaining the maximum fluctuation rate lambda of the new energy to meet
Figure FDA0003020351970000022
Obtaining the second critical permeability of the new energy of the regional power grid
Figure FDA0003020351970000023
Get etacr1、ηcr2New energy critical permeability eta with small numerical value and based on static voltage stabilization for regional power gridScr＝min{ηcr1,ηcr2}。
7. The determination method according to claim 1, wherein the step of distinguishing a sending-end power grid and a receiving-end power grid in a regional power grid, and determining the critical permeability of the regional power grid based on transient voltage stabilization through a transient voltage severity indicator comprises the steps of:
performing transient voltage stability analysis on each fault in the sensitive fault set;
aiming at a sending end power grid, a transient state electricity serious index delta is utilizedSPerforming transient overvoltage analysis on the weak voltage node, wherein
Figure FDA0003020351970000024
UhFor maximum bus voltage during fault transients, UmaxThe voltage threshold value is allowed by a direct current conversion bus or a new energy machine end bus;
aiming at a receiving-end power grid, a transient state electricity severity index delta is utilizedRPerforming a transient low voltage analysis on the voltage weak node, wherein
Figure FDA0003020351970000025
TVlowDuration of node voltage drop (below 0.8p.u.) during fault recovery, TVmaxIs the maximum allowable time;
according to the transient voltage severity index, the permeability of the new energy is adjusted, and when the transient voltage severity index is equal to 1, the transient stability-based new energy critical permeability eta of the new energy of the regional power grid is obtainedTcr。
8. The determination method according to claim 1, wherein 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:
get etaScr、ηTcrSmall-value new energy critical permeability eta of regional power grid based on voltage stability constraintcr＝min{ηScr,ηTcr}。
9. The determination method according to claim 1, further comprising:
adjusting short circuit capacity, external power transmission and external power receiving proportion, reactive compensation investment of all levels of transformer substations, new energy station reactive compensation device configuration, and low-penetration and/or high-penetration control strategies of the new energy station, 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.
10. A new energy critical permeability determination device based on voltage stability constraint is characterized by comprising:
the fault set generation unit is used for generating a regional sensitive fault set according to the initial operation state of the regional power grid and determining a voltage weak node;
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 transient voltage stabilization new energy critical permeability determining unit is used for distinguishing a transmitting end power grid and a receiving end power grid in a regional power grid, and determining the transient voltage stabilization-based new energy critical permeability of the regional power grid according to a transient voltage severity index;
and the voltage stability constraint new energy critical permeability determining unit is used for determining the voltage stability constraint new energy critical permeability of the regional power grid according to the static voltage stability-based new energy critical permeability and the transient voltage stability-based new energy critical permeability.
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