CN114614470A - Extra-high voltage alternating current-direct current power grid operation control method based on parameter identification - Google Patents

Extra-high voltage alternating current-direct current power grid operation control method based on parameter identification Download PDF

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CN114614470A
CN114614470A CN202210022592.1A CN202210022592A CN114614470A CN 114614470 A CN114614470 A CN 114614470A CN 202210022592 A CN202210022592 A CN 202210022592A CN 114614470 A CN114614470 A CN 114614470A
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power grid
direct current
line
alternating current
stability
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陈远东
孟辉
张海龙
史文江
张超
贾鸿益
张振勇
顾大可
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State Grid East Inner Mongolia Electric Power Co ltd Maintenance Branch
State Grid Corp of China SGCC
Northeast Electric Power University
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State Grid East Inner Mongolia Electric Power Co ltd Maintenance Branch
State Grid Corp of China SGCC
Northeast Dianli University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—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
    • 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
    • H02J3/48—Controlling the sharing of the in-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
    • 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
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management

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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides an extra-high voltage alternating current-direct current power grid operation control method based on parameter identification, which comprises the steps of firstly, acquiring real-time operation data of an alternating current power grid, and calculating influence factors influencing relevant parameters of the alternating current power grid; then, collecting real-time operation data of the direct current power grid, and calculating influence factors influencing relevant parameters of the direct current power grid; finally, judging the stability of the extra-high voltage alternating current direct current power grid and adjusting the output of the generator set; the method provided by the invention is used for analyzing line loss factors of the extra-high voltage alternating current and direct current grid system based on a parameter identification method, and adjusting the output of the generator set by determining the relationship between the line loss and the parameters and the environmental temperature of the tail end of the line, so that the stability of the extra-high voltage alternating current and direct current grid system is effectively improved.

Description

Extra-high voltage alternating current-direct current power grid operation control method based on parameter identification
Technical Field
The invention relates to the technical field of power systems, in particular to an extra-high voltage alternating current and direct current power grid operation control method based on parameter identification.
Background
Along with the development of economy in China, the scale of power load is continuously increased, the ultra-high voltage alternating current and direct current transmission technology is rapidly developed, and the pressure caused by the increase of the load is relieved to a great extent. However, the complexity of the extra-high voltage ac/dc power grid also brings new challenges to the stable operation control of the power system. When the disturbance to the grid suddenly increases, the primary task is to maintain the stability of the grid. At present, in the aspect of voltage stability analysis, a time domain simulation method based on numerical integration, an artificial intelligence method and a dynamic voltage stability method based on an area equivalent law are studied to analyze an alternating current-direct current hybrid power transmission power grid, but with the enlargement of the scale of a power system, the workload increases exponentially and the cost also increases accordingly by using the methods. And researchers select and utilize an energy margin index in a transient energy function method as a characteristic quantity for unstable classification of the power system, and then classify unstable factors of the alternating-current and direct-current power transmission grid by utilizing an improved neural network algorithm, so that the accuracy of the result is improved. However, the method needs to extract the dynamic characteristics of the whole system in real time, so that the method is not strong in applicability to a complex extra-high voltage alternating current and direct current power grid.
The fluctuation and uncertainty of the load caused by the increase of the power load provide great challenges for the safe and stable operation of the power grid. In order to maintain the stable operation of the power system, operation parameters in the extra-high voltage alternating current/direct current power system need to be extracted, the current operation state of the system is identified, and corresponding adjustment is made according to the operation state of the power grid, so that the operation stability of the extra-high voltage alternating current/direct current power grid is improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an extra-high voltage alternating current and direct current power grid operation control method based on parameter identification, which comprises the following steps:
collecting real-time operation data of an alternating current power grid, and calculating influence factors influencing relevant parameters of the stability of the alternating current power grid;
collecting real-time operation data of a direct current power grid, and calculating influence factors influencing relevant parameters of the direct current power grid;
calculating discrimination factor S of stability of extra-high voltage alternating current-direct current power gridtAnd judging the stability of the extra-high voltage alternating current direct current power grid and adjusting the output of the generator set.
The method for acquiring the real-time operation data of the alternating current power grid and calculating the influence factors influencing the relevant parameters of the stability of the alternating current power grid comprises the following steps:
step 1.1: acquiring real-time operation data omega of alternating current power grid1Said operating parameter Ω1Including the end voltage U of the line in the AC network1Frequency f1Active power P1Reactive power Q1Total resistance R of the linexLine total inductive reactance LxTotal capacitive reactance of circuit CxAnd real time ambient temperature TwAverage temperature of daily environmentTav；
Step 1.2: calculating the per unit value of the related parameters:
Figure BDA0003463016210000021
in the formula, Rx' is the reference value of the total resistance of the line in the power grid, Lx' is a reference value of total inductive reactance of the line, Cx'is a line total capacitive reactance reference value, T'wIs a real-time ambient temperature reference value, T'avIs a daily average temperature reference value; rx"is the per unit value of the total resistance of the line in the electric network, Lx"is the per unit value of the total inductive reactance of the line, Cx"is per unit value of total capacitive reactance of line, T"wIs the per unit value, T "avIs the per unit value of the average daily temperature;
step 1.3: calculating active power loss P 'of alternating current power grid'1Reactive power loss Q 'of alternating current power grid'1Line voltage drop U'1From grid frequency variation f'1：
Figure BDA0003463016210000022
Figure BDA0003463016210000023
Figure BDA0003463016210000024
Figure BDA0003463016210000025
Step 1.4: calculating the per unit value of the related parameters:
Figure BDA0003463016210000026
in the formula, PjFor the line active power loss reference value, QjFor line reactive power loss reference value, UjReference value of the line end voltage drop, fjIs a grid frequency reference value; p1Per unit value, Q, of active power loss of AC network "1Is per unit value, U, of reactive power loss of an AC power network "1Per unit value, f, for line voltage drop "1Is the per unit value of the power grid frequency change;
step 1.5: calculating influence factor P of active power loss of alternating current line on stability of power gridjyFactor Q influencing power grid stability by reactive power lossjyFactor U for influence of line voltage drop on power grid stabilityjyInfluence factor f of line frequency change on power grid stabilityjy；
Figure BDA0003463016210000031
Figure BDA0003463016210000032
Figure BDA0003463016210000033
Figure BDA0003463016210000034
The method for acquiring the real-time operation data of the direct current power grid and calculating the influence factors influencing the relevant parameters of the stability of the direct current power grid comprises the following steps:
step 2.1: acquiring real-time operation data omega of direct current power grid2Said operating data Ω2Comprises a DC system inverter side voltage U2Active power P at inverter side of DC system2Reactive support power Q of converter in DC system2DC lineTotal resistance RzxDirect current line current I;
step 2.2: calculating per unit value R of total resistance of direct current linezx”：
Figure BDA0003463016210000035
In the formula, Rzx' is a reference value of the total resistance of the direct current line;
step 2.3: calculating active power loss P 'of direct current power grid'2Reactive support power loss Q 'of converter in direct current power grid'2And DC line voltage drop U'2And current variation I' in the dc line;
Figure BDA0003463016210000036
Figure BDA0003463016210000037
Figure BDA0003463016210000041
Figure BDA0003463016210000042
step 2.4: calculating the per unit value of the related parameters:
Figure BDA0003463016210000043
in the formula, PzFor the reference value of the active power loss, Q, of the DC networkzIs a reactive support power loss reference value, U, of a converter in a direct current networkzIs a reference value of the voltage drop of the DC network, IzIs a direct current line current reference value; p'2For active power loss in dc networksPer unit value, Q "2Is the per unit value, U, of the reactive support power loss of a converter in a direct current network "2The voltage drop per unit value of the direct current circuit is shown, and I' is the per unit value of the current change in the direct current circuit;
step 2.5: calculating the influence factor P of active power loss in the DC power grid on the stability of the power gridzyFactor Q influencing power grid stability by reactive power loss of direct current systemzyFactor U for influencing power grid stability by voltage drop of direct current linezyFactor I of influence of current change on power grid stabilityzy；
Figure BDA0003463016210000044
Figure BDA0003463016210000045
Figure BDA0003463016210000046
Figure BDA0003463016210000047
Calculating the discrimination factor S of the stability of the extra-high voltage alternating current and direct current power gridtJudging the stability of the extra-high voltage alternating current direct current power grid and adjusting the output of the generator set, comprising:
step 3.1: calculating discrimination factor S of stability of extra-high voltage alternating current-direct current power gridt：
Figure BDA0003463016210000051
Step 3.2: and determining a judgment threshold, judging the stability of the extra-high voltage alternating current and direct current power grid and adjusting the output of the generator set.
The step 3.2 comprises:
step (ii) of3.2.1: when 0 is less than or equal to St≤θ1When the system is in a stable state, the extra-high voltage alternating current and direct current grid system does not need to adjust the output condition of the generator set;
step 3.2.2: when theta is measured1≤St≤θ2When the system is in a critical stable state, the extra-high voltage alternating current and direct current grid system does not need to adjust the output condition of the generator set;
step 3.2.3: when S ist< 0 or St＞θ2When the system is in an unstable state, the output condition of the generator set needs to be adjusted as follows;
Figure BDA0003463016210000052
Figure BDA0003463016210000053
in the formula, theta1、θ2Two preset thresholds are set, and theta is satisfied1＜θ2P is rated active power of the generator set, Q is rated reactive power of the generator set, PtActive power, Q, to be regulated for the generator settReactive power, P, to be regulated for the generator sett、QtThe output of the generator set needs to be increased when the number is positive, and the output of the generator set needs to be reduced when the number is negative.
The invention has the beneficial effects that:
the invention provides an extra-high voltage alternating current-direct current power grid operation control method based on parameter identification.
Drawings
Fig. 1 is a flow chart of an extra-high voltage alternating current and direct current power grid operation control method based on parameter identification in the invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples. Aiming at the problems in maintaining the stable operation control of the power system, the invention extracts the operation parameters in the extra-high voltage alternating current and direct current power system, identifies the current operation state of the system and correspondingly adjusts the operation state of the power grid. And in view of different operation modes of the alternating current power grid and the direct current power grid, the two power systems are respectively analyzed, the stability of the system is judged according to the operation state, and the output of the generator set is selected to improve the operation stability of the extra-high voltage alternating current and direct current power grid.
As shown in fig. 1, an extra-high voltage alternating current-direct current power grid operation control method based on parameter identification includes the steps of firstly detecting real-time operation data of an extra-high voltage alternating current-direct current power grid, obtaining power grid loss through a parameter identification model, calculating a stability influence factor of the loss on the power grid, analyzing the influence factor, judging the stability of the alternating current-direct current power grid, and finally adjusting the output of a synchronous generator set to ensure the stability of the extra-high voltage alternating current-direct current power grid; the method specifically comprises the following steps:
collecting real-time operation data of an alternating current power grid, and calculating influence factors influencing relevant parameters of the stability of the alternating current power grid; the method comprises the following steps:
step 1.1: acquiring real-time operation data omega of alternating current power grid1Said operating parameter Ω1Including the end voltage U of the line in the AC network1Frequency f1Active power P1Reactive power Q1Total resistance R of the linexLine total inductive reactance LxTotal capacitive reactance of circuit CxAnd real time ambient temperature TwAverage temperature of daily environment Tav；
Step 1.2: calculating the per unit value of the related parameters:
Figure BDA0003463016210000061
in the formula, Rx' being reference of total resistance of line in electric networkValue, Lx' is a reference value of total inductive reactance of the line, Cx'is a line total capacitive reactance reference value, T'wIs a real-time ambient temperature reference value, T'avIs a daily average temperature reference value; rx"is the per unit value of the total resistance of the line in the electric network, Lx"is the per unit value of the total inductive reactance of the line, Cx"is per unit value of total capacitive reactance of line, T"wIs the per unit value, T "avIs the per unit value of the average daily temperature;
step 1.3: calculating active power loss P 'of alternating current power grid'1Reactive power loss Q 'of alternating current power grid'1Line voltage drop U'1From grid frequency variation f'1：
Figure BDA0003463016210000062
Figure BDA0003463016210000071
Figure BDA0003463016210000072
Figure BDA0003463016210000073
Step 1.4: calculating the per unit value of the related parameters:
Figure BDA0003463016210000074
in the formula, PjFor the line active power loss reference value, QjFor line reactive power loss reference value, UjLine end voltage drop reference, fjThe reference value is a power grid frequency reference value; p'1Per unit value, Q', for the active power loss of an AC network "1Per unit for reactive power loss of AC networkValue, U "1Per unit value, f, for line voltage drop "1Is the per unit value of the power grid frequency change;
step 1.5: calculating influence factor P of active power loss of alternating current line on stability of power gridjyFactor Q influencing power grid stability by reactive power lossjyFactor U for influence of line voltage drop on power grid stabilityjyFactor f influencing grid stability by line frequency changejy；
Figure BDA0003463016210000075
Figure BDA0003463016210000076
Figure BDA0003463016210000077
Figure BDA0003463016210000078
Collecting real-time operation data of a direct current power grid, and calculating influence factors influencing relevant parameters of the direct current power grid; the method comprises the following steps:
step 2.1: acquiring real-time operation data omega of direct current power grid2Said operating data Ω2Comprises a DC system inverter side voltage U2Active power P at inverter side of DC system2Reactive support power Q of converter in DC system2Total resistance R of DC linezxDirect current line current I;
step 2.2: calculating per unit value R of total resistance of direct current linezx”：
Figure BDA0003463016210000081
In the formula，Rzx' is a reference value of the total resistance of the direct current line;
step 2.3: calculating active power loss P of direct current power grid2', reactive support power loss Q ' of converter in direct current network '2And DC line voltage drop U'2And current variation I' in the dc line;
Figure BDA0003463016210000082
Figure BDA0003463016210000083
Figure BDA0003463016210000084
Figure BDA0003463016210000085
step 2.4: calculating the per unit value of the related parameters:
Figure BDA0003463016210000086
in the formula, PzFor the reference value of the active power loss, Q, of the DC networkzIs a reactive support power loss reference value, U, of a converter in a direct current networkzIs a reference value of the voltage drop of the DC network, IzIs a direct current line current reference value; p'2Is the per unit value, Q, of the active power loss of the DC network "2Is the per unit value, U, of the reactive support power loss of a converter in a direct current network "2The voltage drop per unit value of the direct current circuit is shown, and I' is the per unit value of the current change in the direct current circuit;
step 2.5: calculating the influence factor P of active power loss in the DC power grid on the stability of the power gridzyStability of reactive power loss of direct current system to power gridInfluencing factor QzyFactor U for influencing power grid stability by voltage drop of direct current linezyFactor I of influence of current change on power grid stabilityzy；
Figure BDA0003463016210000091
Figure BDA0003463016210000092
Figure BDA0003463016210000093
Figure BDA0003463016210000094
Calculating discrimination factor S of stability of extra-high voltage alternating current-direct current power gridtJudging the stability of the extra-high voltage alternating current direct current power grid and adjusting the output of a generator set; the method comprises the following steps:
step 3.1: calculating discrimination factor S of stability of extra-high voltage alternating current-direct current power gridt：
Figure BDA0003463016210000095
Step 3.2: determining a judgment threshold value, judging the stability of the extra-high voltage alternating current and direct current power grid and adjusting the output of a generator set;
step 3.2.1: when 0 is less than or equal to St≤θ1When the system is in a stable state, the extra-high voltage alternating current and direct current grid system does not need to adjust the output condition of the generator set;
step 3.2.2: when theta is1≤St≤θ2When the system is in a critical stable state, the extra-high voltage alternating current and direct current grid system does not need to adjust the output condition of the generator set;
step 3.2.3: when S ist< 0 or St＞θ2When the system is in an unstable state, the output condition of the generator set needs to be adjusted as follows;
Figure BDA0003463016210000101
Figure BDA0003463016210000102
in the formula, theta1、θ2Two preset thresholds are set, and theta is satisfied1＜θ2P is rated active power of the generator set, Q is rated reactive power of the generator set, PtActive power, Q, to be regulated for the generator settReactive power, P, to be regulated for the generator sett、QtThe output of the generator set needs to be increased when the number is positive, and the output of the generator set needs to be reduced when the number is negative.
In this embodiment, the operating state of the ac power grid is detected according to the parameters in a certain area to obtain Rx＝300Ω，Lx＝400mH，Cx＝0.7μF，P1＝3500MW，U1＝975kV，Q1＝1562Mvar，f1＝49.8Hz，Tw＝6℃，TavAt 8 ℃. Reference value R'x＝150Ω，L'x＝500mH，C'x＝0.5μF，Pj＝4000MW,Uj＝1000kV，Qj＝1800Mvar，fj＝50Hz，T'w＝8℃，T'av10 ℃. The rated useful power P of the synchronous generator set is 500MW, and the rated reactive power Q is 100 Mvar.
Calculated to obtain
Figure BDA0003463016210000103
Then active power loss P 'of AC power grid'1And reactive power loss Q 'of alternating current power grid'1Line voltage drop U'1With change in frequency of the grid f1' respectively are
Figure BDA0003463016210000104
Figure BDA0003463016210000105
Figure BDA0003463016210000106
Figure BDA0003463016210000111
Calculated per unit value of
Figure BDA0003463016210000112
Obtaining the influence factor P of the active power loss of the alternating current line on the stability of the power grid through calculationjyFactor Q influencing the stability of the grid by the loss of reactive powerjyFactor U influencing grid stability by line voltage dropjyFactor f influencing grid stability by line frequency changejy。
Figure BDA0003463016210000113
Figure BDA0003463016210000114
Figure BDA0003463016210000115
Figure BDA0003463016210000116
Detecting the running state of the DC system to obtain Rzx＝276Ω，P2＝6000MW，U2＝785kV，Q23365Mvar, I7643A. Reference value R'zx＝206Ω，Pz＝7000MW，Uz＝800kV，Qz＝3700Mvar，Iz＝8750A。
Per unit value of DC line resistance of
Figure BDA0003463016210000117
Calculating to obtain the active power loss P of the inverter side of the identified direct current system through a parameter identification model2' reactive support power loss Q ' of converter in direct current system '2And DC line voltage drop U'2And the current change I' in the direct current line is respectively as follows:
Figure BDA0003463016210000118
Figure BDA0003463016210000119
Figure BDA0003463016210000121
Figure BDA0003463016210000122
calculated per unit value of
Figure BDA0003463016210000123
Calculating to obtain the influence factor P of the active power loss of the direct current system on the stability of the power gridzyFactor Q influencing grid stability by reactive power loss of direct current systemzyFactor U influencing grid stability by voltage drop of direct-current linezyChange of currentFactor I influencing the stability of the power gridzyRespectively as follows:
Figure BDA0003463016210000124
Figure BDA0003463016210000125
Figure BDA0003463016210000126
Figure BDA0003463016210000127
Figure BDA0003463016210000128
the stability determinations are shown in table 1:
TABLE 1 stability discrimination
Figure BDA0003463016210000129
By StThe value of judging extra-high voltage alternating current-direct current system stability, if the system is unstable, then adjusting the generator set and exerting oneself, the generator set that needs to adjust exerts oneself and is:
Figure BDA0003463016210000131
Figure BDA0003463016210000132
calculating to obtain the active power P needing to be increasedt188.898MW, the reactive power to be added is Qt＝63.289Mvar。

Claims (5)

1. An extra-high voltage alternating current-direct current power grid operation control method based on parameter identification is characterized by comprising the following steps:
collecting real-time operation data of an alternating current power grid, and calculating influence factors influencing relevant parameters of the stability of the alternating current power grid;
collecting real-time operation data of a direct current power grid, and calculating influence factors influencing relevant parameters of the direct current power grid;
calculating discrimination factor S of stability of extra-high voltage alternating current-direct current power gridtAnd judging the stability of the extra-high voltage alternating current direct current power grid and adjusting the output of the generator set.
2. The method for controlling the operation of the extra-high voltage alternating current and direct current power grid based on the parameter identification according to claim 1, wherein the step of collecting real-time operation data of the alternating current power grid and calculating influence factors influencing relevant parameters of the stability of the alternating current power grid comprises the following steps:
step 1.1: acquiring real-time operation data omega of alternating current power grid1Said operating parameter Ω1Including the end voltage U of the line in the AC network1Frequency f1Active power P1Reactive power Q1Total resistance R of the linexLine total inductive reactance LxTotal capacitive reactance of circuit CxAnd real time ambient temperature TwAverage temperature of daily environment Tav；
Step 1.2: calculating the per unit value of the related parameters:
Figure FDA0003463016200000011
in the formula, Rx' is the reference value of the total resistance of the line in the power grid, Lx' is a reference value of total inductive reactance of the line, Cx'is a line total capacitive reactance reference value, T'wIs a real-time ambient temperature reference value, T'avIs a daily average temperature reference value; rxIs' in the power gridPer unit value of total resistance of line, Lx"is the per unit value of the total inductive reactance of the line, Cx"is the per unit value of the total capacitive reactance of the line, TwIs a per unit value, T ″, of the real-time ambient temperatureavIs the per unit value of the average daily temperature;
step 1.3: calculating active power loss P of alternating current power grid1', reactive power loss Q ' of AC power grid '1Line voltage drop U'1With change in frequency of the grid f1'：
Figure FDA0003463016200000012
Figure FDA0003463016200000013
Figure FDA0003463016200000014
Figure FDA0003463016200000021
Step 1.4: calculating the per unit value of the related parameters:
Figure FDA0003463016200000022
in the formula, PjFor the line active power loss reference value, QjFor line reactive power loss reference value, UjReference value of the line end voltage drop, fjThe reference value is a power grid frequency reference value; p1'is the per unit value, Q' of the active power loss of the AC power network1Is the per unit value, U ″, of the reactive power loss of the AC power grid1Is the per unit value of the line voltage drop, f1"is the per unit value of the change of the power grid frequency;
step 1.5: calculating influence factor P of active power loss of alternating current line on stability of power gridjyFactor Q influencing power grid stability by reactive power lossjyFactor U for influence of line voltage drop on power grid stabilityjyFactor f influencing grid stability by line frequency changejy；
Figure FDA0003463016200000023
Figure FDA0003463016200000024
Figure FDA0003463016200000025
Figure FDA0003463016200000026
3. The method for controlling the operation of the extra-high voltage alternating current-direct current power grid based on the parameter identification according to claim 1, wherein the step of collecting real-time operation data of the direct current power grid and calculating influence factors influencing relevant parameters of the stability of the direct current power grid comprises the following steps:
step 2.1: acquiring real-time operation data omega of direct current power grid2Said operating data Ω2Comprises a DC system inverter side voltage U2Active power P at inverter side of DC system2Reactive support power Q of converter in DC system2Total resistance R of DC linezxDirect current line current I;
step 2.2: calculating per unit value R of total resistance of direct current linezx”：
Figure FDA0003463016200000031
In the formula, Rzx' is a reference value of the total resistance of the direct current line;
step 2.3: calculating active power loss P 'of direct current power grid'2Reactive support power loss Q 'of converter in direct current power grid'2And DC line voltage drop U'2And the current variation I' in the dc line;
Figure FDA0003463016200000032
Figure FDA0003463016200000033
Figure FDA0003463016200000034
Figure FDA0003463016200000035
step 2.4: calculating the per unit value of the related parameters:
Figure FDA0003463016200000036
in the formula, PzFor the reference value of the active power loss, Q, of the DC networkzIs a reactive support power loss reference value, U, of a converter in a direct current networkzIs a reference value of the voltage drop of the DC network, IzIs a direct current line current reference value; p ″)2Is the per unit value, Q ″, of the active power loss of the DC power grid2Is the per unit value, U ″, of the reactive support power loss of a converter in a direct current network2Is the per unit value of the voltage drop of the DC line, I' is DCPer unit value of current change in the line;
step 2.5: calculating the influence factor P of active power loss in the DC power grid on the stability of the power gridzyFactor Q influencing power grid stability by reactive power loss of direct current systemzyFactor U for influencing power grid stability by voltage drop of direct current linezyFactor I of influence of current change on power grid stabilityzy；
Figure FDA0003463016200000041
Figure FDA0003463016200000042
Figure FDA0003463016200000043
Figure FDA0003463016200000044
4. The method for controlling the operation of the extra-high voltage alternating current and direct current power grid based on the parameter identification according to claim 1, wherein a discrimination factor S for the stability of the extra-high voltage alternating current and direct current power grid is calculatedtJudging the stability of the extra-high voltage alternating current direct current power grid and adjusting the output of the generator set, comprising the following steps:
step 3.1: calculating discrimination factor S of stability of extra-high voltage alternating current-direct current power gridt：
Figure FDA0003463016200000045
Step 3.2: and determining a judgment threshold value, judging the stability of the extra-high voltage alternating current and direct current power grid and adjusting the output of the generator set.
5. The method for controlling the operation of the extra-high voltage alternating current and direct current power grid based on the parameter identification is characterized in that the step 3.2 comprises the following steps:
step 3.2.1: when in use
Figure FDA0003463016200000046
When the system is in a stable state, the extra-high voltage alternating current and direct current grid system does not need to adjust the output condition of the generator set;
step 3.2.2: when in use
Figure FDA0003463016200000047
When the system is in a critical stable state, the extra-high voltage alternating current and direct current grid system does not need to adjust the output condition of the generator set;
step 3.2.3: when S ist< 0 or
Figure FDA0003463016200000048
When the system is in an unstable state, the output condition of the generator set needs to be adjusted as follows;
Figure FDA0003463016200000049
Figure FDA0003463016200000051
in the formula (I), the compound is shown in the specification,
Figure FDA0003463016200000052
two preset threshold values are satisfied
Figure FDA0003463016200000053
P is rated active power of the generator set, Q is rated reactive power of the generator set, PtActive power, Q, to be regulated for the generator settReactive power, P, to be regulated for the generator sett、QtThe output of the generator set needs to be increased when the number is positive, and the output of the generator set needs to be reduced when the number is negative.
CN202210022592.1A 2022-01-10 2022-01-10 Extra-high voltage alternating current-direct current power grid operation control method based on parameter identification Pending CN114614470A (en)

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Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002300722A (en) * 2001-03-30 2002-10-11 Kansai Electric Power Co Inc:The Voltage stability evaluation device, voltage stability evaluation method, voltage stability evaluation program and computer-readable recording medium recording voltage stability evaluation program in power system
US20090063122A1 (en) * 2006-07-19 2009-03-05 Edsa Micro Corporation Real-time stability indexing for intelligent energy monitoring and management of electrical power network system
WO2014173131A1 (en) * 2013-04-23 2014-10-30 国家电网公司 Large power grid overall situation on-line integrated quantitative evaluation method based on response
CN107276083A (en) * 2017-07-17 2017-10-20 中国科学院电工研究所 A kind of alterating and direct current network operation control method towards energy internet
WO2018120699A1 (en) * 2016-12-28 2018-07-05 江苏金风科技有限公司 Micro-grid dynamic stability control system and method
CN108767899A (en) * 2018-06-19 2018-11-06 哈尔滨理工大学 A kind of low pressure micro-capacitance sensor small disturbed stability analysis method
CN109167400A (en) * 2018-08-29 2019-01-08 中国电力科学研究院有限公司 A kind of method and system for the voltage stability determining more feed-in ac and dc systems
CN110994599A (en) * 2019-11-28 2020-04-10 国网内蒙古东部电力有限公司经济技术研究院 Extra-high voltage AC/DC transmission output type power grid stability judgment method based on big data
CN111030140A (en) * 2019-12-26 2020-04-17 国网内蒙古东部电力有限公司经济技术研究院 Battery energy storage power grid frequency stability control method based on big data
CN111193267A (en) * 2019-12-03 2020-05-22 国网内蒙古东部电力有限公司经济技术研究院 Extra-high voltage alternating current and direct current voltage stability control method based on cloud computing
CN112526262A (en) * 2020-11-26 2021-03-19 国网宁夏电力有限公司电力科学研究院 Method for judging stability of direct-current transmission end power grid accessed by high-proportion new energy
CN112557813A (en) * 2020-11-26 2021-03-26 国网宁夏电力有限公司电力科学研究院 Method for judging voltage stability of power grid under simultaneous fault of multiple loops of direct current
CN113572173A (en) * 2021-08-13 2021-10-29 国网天津市电力公司 Power system voltage regulation control method based on super capacitor

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002300722A (en) * 2001-03-30 2002-10-11 Kansai Electric Power Co Inc:The Voltage stability evaluation device, voltage stability evaluation method, voltage stability evaluation program and computer-readable recording medium recording voltage stability evaluation program in power system
US20090063122A1 (en) * 2006-07-19 2009-03-05 Edsa Micro Corporation Real-time stability indexing for intelligent energy monitoring and management of electrical power network system
WO2014173131A1 (en) * 2013-04-23 2014-10-30 国家电网公司 Large power grid overall situation on-line integrated quantitative evaluation method based on response
WO2018120699A1 (en) * 2016-12-28 2018-07-05 江苏金风科技有限公司 Micro-grid dynamic stability control system and method
CN107276083A (en) * 2017-07-17 2017-10-20 中国科学院电工研究所 A kind of alterating and direct current network operation control method towards energy internet
CN108767899A (en) * 2018-06-19 2018-11-06 哈尔滨理工大学 A kind of low pressure micro-capacitance sensor small disturbed stability analysis method
CN109167400A (en) * 2018-08-29 2019-01-08 中国电力科学研究院有限公司 A kind of method and system for the voltage stability determining more feed-in ac and dc systems
CN110994599A (en) * 2019-11-28 2020-04-10 国网内蒙古东部电力有限公司经济技术研究院 Extra-high voltage AC/DC transmission output type power grid stability judgment method based on big data
CN111193267A (en) * 2019-12-03 2020-05-22 国网内蒙古东部电力有限公司经济技术研究院 Extra-high voltage alternating current and direct current voltage stability control method based on cloud computing
CN111030140A (en) * 2019-12-26 2020-04-17 国网内蒙古东部电力有限公司经济技术研究院 Battery energy storage power grid frequency stability control method based on big data
CN112526262A (en) * 2020-11-26 2021-03-19 国网宁夏电力有限公司电力科学研究院 Method for judging stability of direct-current transmission end power grid accessed by high-proportion new energy
CN112557813A (en) * 2020-11-26 2021-03-26 国网宁夏电力有限公司电力科学研究院 Method for judging voltage stability of power grid under simultaneous fault of multiple loops of direct current
CN113572173A (en) * 2021-08-13 2021-10-29 国网天津市电力公司 Power system voltage regulation control method based on super capacitor

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
MOUDUD AHMED, LASANTHA MEEGAHAPOLA, ARASH VAHIDNIA, MANOJ DATTA: "Influence of Feeder Characteristics on Hybrid AC/DC Microgrids Stability", 2019 9TH INTERNATIONAL CONFERENCE ON POWER AND ENERGY SYSTEMS (ICPES), 2 June 2020 (2020-06-02) *
吴双;夏立;张超;王新枝;: "电力推进对船舶直流区域配电稳定性影响", 中国航海, vol. 2012, no. 4, 25 December 2012 (2012-12-25) *
李亚楠;杨鹏;王华君;: "大规模风电并网对电网的影响及解决措施", 中南民族大学学报(自然科学版), vol. 2017, no. 3, 15 September 2017 (2017-09-15) *

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