CN104868478B - A kind of method of the startup dynamic partition scheme under the power network state of emergency - Google Patents
A kind of method of the startup dynamic partition scheme under the power network state of emergency Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention discloses a kind of method of the startup dynamic partition scheme under power network state of emergency, the method comprises the following steps：Step 10）The modulus of impedance desired value of the weak node in each partition power grid in measuring and calculating power network；Step 20）The relational expression set up between power margin and impedance modular character；Step 30）According to the power margin limit value and formula of setting（1）, calculate modulus of impedance metrics-thresholds；Step 40）By step 10）The modulus of impedance desired value of all weak nodes and step 30 in the partition power grid for measuring）The modulus of impedance metrics-thresholds for measuring are compared, if the modulus of impedance desired value of any one weak node is less than modulus of impedance metrics-thresholds in partition power grid, start dynamic partition scheme；Otherwise the partition power grid voltage security at the moment, return to step 10）.The method of the startup dynamic partition scheme under the power network state of emergency, may be implemented under the power network state of emergency, start dynamic partition, it is ensured that power supply reliability.
Description
Technical field
The invention belongs to bulk power grid emergent control technical field, it particularly relates to opening under a kind of power network state of emergency
The method of dynamic dynamic partition scheme.
Background technology
Regional power grid interconnection, extra-high voltage alternating current-direct current system develop rapidly and long-distance and large-capacity power transmission general layout it is basic
Formation has all greatly reinforced the electrical link between bulk power grid.The development of this electric power general layout of overall importance, integrated will cause electricity
Net stability characteristic (quality) is increasingly complex, dynamic mutual influence between aggravation regional power grid.
In this context, power network emergency even can quickly control load in the case of failure, using original circuit
Switched-mode power supply network is rationally recombinated, so control related elements trend, improve subregion reactive voltage supporting role be
Determine that power network keeps the key of safe and stable operation.For having been achieved with the power network of layering and zoning operation, dynamic partition skill
Art is undoubtedly carries out prevention and control, the effective means for making power network exit the state of emergency for operation of power networks.Additionally,《State Council
599 command electric power safety accident emergencies are disposed and regulations of investigating》(lower abbreviation《599 commands》) there is difference to power system
Different zones power network cutting load ratio has carried out clear and definite regulation under degree accident conditions, rationally application power network Dynamic partitioning techniques
Can active response《599 commands》, reduce to subtract supplying load proportion to the full extent, it is ensured that power supply reliability.
Power network dynamic partition be a global question, it is necessary to global to power network (including safety and stability, short circuit current and
The aspects such as power supply reliability) there is an entirety to hold.And it is then power network state of emergency dynamic partition skill when to carry out dynamic partition
The precondition of art research, its core is to need the critical conditions according to residing for system, judges whether to need to take partition scheme,
Formulate a rational start-up criterion for starting dynamic partition scheme.At present in terms of partition scheme start-up criterion, correlative study
Also compare shortage.
The content of the invention
Technical problem：The technical problems to be solved by the invention are：A kind of startup dynamic under power network state of emergency is provided
The method of partition scheme, to realize under the power network state of emergency, starts dynamic partition, it is ensured that power supply reliability.
Technical scheme：In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of method of the startup dynamic partition scheme under power network state of emergency, the method comprises the following steps：
Step 10) measuring and calculating power network in each partition power grid in weak node modulus of impedance desired value；
Step 20) relational expression set up between power margin as shown in formula (1) and impedance modular character；
Formula (1)
In above formula, KPRepresent power margin；VindexRepresent impedance modular character；θ represents Equivalent Network impedance angle；Represent negative
Lotus impedance angle；
Step 30) according to the power margin limit value and formula (1) of setting, calculate modulus of impedance metrics-thresholds；
Step 40) by step 10) the modulus of impedance desired value and step 30 of all weak nodes in the partition power grid that measures) survey
The modulus of impedance metrics-thresholds for obtaining are compared, if the modulus of impedance desired value of any one weak node is less than resistance in partition power grid
Anti- modular character threshold value, then start dynamic partition scheme；Otherwise the partition power grid voltage security at the moment, return to step 10).
Further, described modulus of impedance metrics-thresholds are 0.358.
Beneficial effect：The present invention compared with prior art, with advantages below：
The method of the present invention determines to carry out node voltage stabilization using the impedance modular character based on Thevenin's equivalence first
Property analysis, then determine the relation between impedance modular character and power margin, and according to the limit value of pre-determined power margin,
Determine modulus of impedance metrics-thresholds under the power network state of emergency, row index calculating is finally entered to weak node in subregion, once in the presence of section
The modulus of impedance desired value of point is less than modulus of impedance metrics-thresholds, then start dynamic partition scheme.The method is dexterously by voltage indexes
Value is associated with given power margin, calculates modulus of impedance metrics-thresholds, so that partition scheme starts threshold value and more truly may be used
Letter.In addition, the method for the present invention from mains side it is active/reactive response enabling capabilities are not enough and case of heavy load under there is load and dash forward
Change situation is accounted for.These factors will primarily result in the partition power grid frequency of occurrences, voltage, short circuit current problem.For current
The electric power general layout of regional power grid interconnection, unless there is islet operation, the probability that general frequency issues occur is not very big, is mainly gone back
It is voltage problem.Therefore dynamic partition scheme start-up criterion concentrates consideration voltage indexes under the power network state of emergency.So start more
Added with effect and accurately.In the method for the present invention, it is analyzed using quiescent voltage index, can accurately reflects in subregion each
The Voltage Stability Level of node, judges whether partition power grid is in a state of emergency, simple, workable etc. excellent with calculating
Gesture.
Brief description of the drawings
Fig. 1 is FB(flow block) of the invention；
Fig. 2 is node voltage Thevenin's equivalence system diagram.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and in conjunction with the embodiments.But the invention is not restricted to be given
The embodiment for going out.
The power network state of emergency refers mainly to various operation constraintss and is broken rear power network and enters unsure state, the present invention
For Dynamic partitioning techniques mainly for power network be subject to inside and outside disturbance after, due to the fragility of itself, into improper fortune
Row state.This state not necessarily occurs the out-of-limit situation of constraints.When operation constrains the nargin for leaving less than a certain
During threshold value, you can to think that power network enters the state of emergency.Consider to be led when mains side and the extraordinary change of load side respectively herein
Send a telegraph net into the factor of the state of emergency, such as power supply it is active/reactive response enabling capabilities are not enough, wind-powered electricity generation intermittence new energy work(
Occur the aspects such as sudden load change under rate big ups and downs, case of heavy load.
As shown in figure 1, the method for the startup dynamic partition scheme under a kind of power network state of emergency of the embodiment of the present invention, bag
Include following steps：
Step 10) measuring and calculating power network in each partition power grid in weak node modulus of impedance desired value.
Step 20) relational expression set up between power margin as shown in formula (1) and impedance modular character；
Formula (1)
In above formula, KPRepresent power margin；VindexRepresent impedance modular character；θ represents Equivalent Network impedance angle；Represent negative
Lotus impedance angle.
Step 30) according to the power margin limit value and formula (1) of setting, calculate modulus of impedance metrics-thresholds；
Step 40) by step 10) the modulus of impedance desired value and step 30 of all weak nodes in the partition power grid that measures) survey
The modulus of impedance metrics-thresholds for obtaining are compared, if the modulus of impedance desired value of any one weak node is less than resistance in partition power grid
Anti- modular character threshold value, then start dynamic partition scheme；Otherwise the partition power grid voltage security at the moment, return to step 10).
Step 10) in, calculate the modulus of impedance desired value of weak node, Dai Wei is carried out to weak node in partition power grid first
Southern equivalent parameters are calculated, and obtain the equivalent impedance of Dai Weinan systems, thus calculate the modulus of impedance desired value of the weak node.
Set up real-time Thevenin's equivalence circuit diagram as shown in Figure 2.It is in Fig. 2, all electromotive force in system is equivalent for one
Individual equivalent electromotive force, usesRepresent；Similarly, by the line impedance in addition to the node with an equivalent impedanceTo represent,
Represent node load impedance.For any weak node of a certain subregion electric field, complication system is switched to by Thevenin's equivalence
Simple AC system.Comprise the following steps that：
Step 101) when the real-time Thevenin's equivalence parameter of the system of carrying out is calculated, first with preceding double sampling and process
The data calculating parameter initial value for arriving.According to formula (201), Thevenin's equivalence impedance initial value is obtained based on traditional two-point method
Formula (201)
System Thevenin's equivalence potential initial value is obtained according to formula (202)
Formula (202)
In formula,Represent first time sampled voltage phasor, UL0The voltage magnitude sampled obtain for the first time is represented,Represent
Sample for the first time the voltage phase angle for obtaining；Represent second sampled voltage phasor, UL1Represent the electricity sampled obtain for the second time
Pressure amplitude value,Represent the voltage phase angle sampled obtain for the second time；IL0Represent the current amplitude sampled obtain for the first time；IL1Represent
Sample for the second time the current amplitude for obtaining.
The predicted value of corresponding equivalent impedance is calculated according to formula (203)
Formula (203)
Wherein,Represent that ith iteration obtains equivalent impedance predicted value,Represent the equivalence electricity that ith iteration is obtained
Resistance predicted value,Represent the equivalent reactance predicted value that ith iteration is obtained, Eeqi-1What expression was iterated to calculate out for the i-th -1 time etc.
Value potential amplitude, δeqi-1The equivalent potential phase angle that expression is iterated to calculate out for the i-th -1 time, ULiRepresent the voltage that i ＆ lt sampling is obtained
Amplitude,Represent the voltage phase angle that i ＆ lt sampling is obtained, ILiRepresent the current amplitude that i ＆ lt sampling is obtained.
For the sampling of wherein i ＆ lt, the voltage phasor obtained using i ＆ lt samplingCurrent data ILiAnd i-th -1
The amplitude E of the secondary equivalent potential being calculatedeqi-1With the phase angle δ of equivalent potentialeqi-1, it is calculated equivalent potential correctionJudgment variable Δ Z and angle modification amount Δ δ in the middle of corresponding is calculated according to formula (204)：
Formula (204)
And then obtain the correction of equivalent potential
IfAnd Δ Z>0, then
IfAnd Δ Z<0, then
IfAnd Δ Z>0, then
IfAnd Δ Z<0, then
IfThen
In formula,Represent that the i-th -1 time iteration obtains equivalent impedance, Reqi-1The equivalence electricity that the i-th -1 time iteration of expression is obtained
Resistance, Xeqi-1The equivalent reactance value that the i-th -1 time iteration of expression is obtained, ULi-1The i-th -1 time voltage magnitude for obtaining of sampling is represented,
ILi-1Represent the i-th -1 time current amplitude for obtaining of sampling.
Thus, the Thevenin's equivalence potential phasor that i ＆ lt sampling is obtained is calculated according to formula (205)
Formula (205)
Wherein,The i-th -1 time Thevenin's equivalence potential phasor for obtaining of sampling is represented,Represent that equivalent potential is repaiied
Positive quantity,Represent the Thevenin's equivalence potential phasor that i ＆ lt sampling is obtained.
It is being calculated the corresponding Thevenin's equivalence potential phasor of i ＆ lt samplingAfterwards, formula (211) meter is carried it into
Calculate the equivalent impedance phasor after i ＆ lt sampling
Formula (211)
Wherein,The Thevenin's equivalence potential phasor that i ＆ lt sampling is obtained is represented,After expression i ＆ lt sampling etc.
Value impedance phasor, ILiRepresent the current amplitude that i ＆ lt sampling is obtained, ULiRepresent the voltage magnitude that i ＆ lt sampling is obtained.
So far the calculating to the real-time Thevenin's equivalence parameter of i ＆ lt sampled data is completed, is continued acquisition i+1 time and is adopted
Sample data, and repeat the calculating of above-mentioned real-time Thevenin's equivalence parameter.
Step 102) measuring and calculating Dai Weinan systems equivalent impedance：
Thevenin's equivalence circuit diagram as shown in Figure 2 understands that the apparent energy that the load bus under polar coordinate system is obtained is such as
Shown in formula (206)：
Formula (206)
As shown in formula (207), the active P that load bus absorbsL, reactive power QLRespectively
Formula (207)
In formula, θ represents Equivalent Network impedance angle,Represent load impedance angle, EeqRepresent Thevenin's equivalence electromotive force amplitude；
ZeqRepresent Thevenin's equivalence impedance magnitude, ZLNode load impedance magnitude is represented,Represent node load impedance；Expression is worn
The southern equivalent impedance of dimension；
PLAnd QLTo ZLDerivation, can proper ZL=ZeqWhen,The now active power of line transmission
Reach maximum PLmaxThe reactive power Q obtained with load sideLmaxAlso maximum is reached, as shown in formula (208)：
Formula (208)
Step 103) measuring and calculating modulus of impedance index test value：
From step 102), when line transmission power is maximum, voltage is in critical stable state, now load impedance
It is equal with Thevenin's equivalence impedance value, that is, there is formula (209)：
Formula (209)
Voltage stability is judged with impedance modular character, index test value is defined as：
Formula (210)
Modulus of impedance index test value is accurately reflected between system current operating conditions point and maximum transmission power point
Gap.When index test value closer to 0 when, illustrate that operating point becomes closer to voltage stability critical point, node voltage it is steady
It is qualitative poorer.
In step 20) in, the process of the relational expression set up between power margin and impedance modular character is：
Power margin KPIt is defined as
Formula (301)
Convolution (207) and formula (301), obtain KPAnother expression way, as shown in formula (302)：
Formula (302)
Can be obtained by formula (210)
Formula (303)
Then convolution (302) and formula (303), obtain power margin KPWith impedance modular character VindexBetween relation
In step 30) in, the power margin limit value of setting, to be previously set, can be according to the operating rule of this area
Limit.For example, according to《Power system safety and stability computing technique specification》To power margin in (standard No. DL/T1234-2013)
KPSetting, derive corresponding modulus of impedance metrics-thresholds, and whether the criterion of the state of emergency is reached in this, as node voltage.
《Power system safety and stability computing technique specification》Point out, when in region, load maximum or section tidal current reach maximum, KPNo
8% must be less than；Under N-1 failures, KP5% must not be less than.It can thus be concluded that formula (401)：
Formula (401)
It can thus be concluded that：
Therefore, can be by Vindex<0.358 used as dynamic partition start-up criterion.
An embodiment is enumerated below.
By taking 230kV Shanghai Ju Feng 1# this weak node as an example, Load flow calculation is carried out by BPA softwares and stablizes file to transport
OK, simulation time is 10s, obtains the weak node real time information (including active power, reactive power, voltage magnitude and phase
Angle), MATLAB is imported data to, and programming carries out voltage indexes calculating, obtains a result as shown in table 1.
The 230kV Shanghai Ju Feng 1# voltage indexes results of table 1
| Time/s | Voltage indexes value | Time/s | Voltage indexes value |
| 0.5 | 0.763099818763312 | 5.5 | 0.662943865068431 |
| 1.0 | 0.679590478635123 | 6.0 | 0.667358883729164 |
| 1.5 | 0.498000794003520 | 6.5 | 0.675677440313633 |
| 2.0 | 0.457948311073828 | 7.0 | 0.685469870716686 |
| 2.5 | 0.462524250660278 | 7.5 | 0.695403741868622 |
| 3.0 | 0.465589621643638 | 8.0 | 0.703210457591864 |
| 3.5 | 0.453258840128252 | 8.5 | 0.707505750033555 |
| 4.0 | 0.404039885804003 | 9.0 | 0.708775548352132 |
| 4.5 | 0.617469536821706 | 9.5 | 0.709931902035739 |
| 5.0 | 0.572478419419662 | 10.0 | 0.711083592870503 |
From data in table 1, in this 10s of emulation, the voltage indexes value V of the nodeindex>0.358, explanation
230kV Shanghai Ju Feng 1# busbar voltage stabilizations.Further determine whether to need boot partition scheme, in addition it is also necessary to whole subregion its
His weak node carries out same calculating, and whether observation index value exceeds 0.358, can just draw a conclusion.The index of other nodes
Calculate as the computational methods of above-mentioned weak node, just do not repeat one by one.
It should be noted that：Described embodiment is only some embodiments of the present application, rather than whole embodiments.
Based on the embodiment in the application, it is all that those of ordinary skill in the art are obtained under the premise of creative work is not made
Other embodiment, belongs to the scope of the application protection.
Claims (1)
1. the method for the startup dynamic partition scheme under a kind of power network state of emergency, it is characterised in that the method includes following step
Suddenly：
Step 10) measuring and calculating power network in each partition power grid in weak node modulus of impedance desired value；
Step 10) in, calculate the modulus of impedance desired value of weak node, Dai Weinan etc. is carried out to weak node in partition power grid first
Value parameter is calculated, and obtains the equivalent impedance of Dai Weinan systems, then calculate the modulus of impedance desired value of the weak node；Specifically include step
It is rapid 101) to step 103)：
Step 101) when the real-time Thevenin's equivalence parameter of the system of carrying out is calculated, obtained first with preceding double sampling and treatment
Data calculating parameter initial value, according to formula (201), Thevenin's equivalence impedance initial value is obtained based on traditional two-point method
System Thevenin's equivalence potential initial value is obtained according to formula (202)
In formula,Represent first time sampled voltage phasor, UL0The voltage magnitude sampled obtain for the first time is represented,Represent first
The secondary voltage phase angle for obtaining of sampling；Represent second sampled voltage phasor, UL1Represent the voltage amplitude sampled obtain for the second time
Value,Represent the voltage phase angle sampled obtain for the second time；IL0Represent the current amplitude sampled obtain for the first time；IL1Represent second
The current amplitude that sampling is obtained；
The predicted value of corresponding equivalent impedance is calculated according to formula (203)
Wherein,Represent that ith iteration obtains equivalent impedance predicted value,Represent that the substitutional resistance that ith iteration is obtained is pre-
Measured value,Represent the equivalent reactance predicted value that ith iteration is obtained, Eeqi-1The equivalent potential that expression is iterated to calculate out for the i-th -1 time
Amplitude, δeqi-1The equivalent potential phase angle that expression is iterated to calculate out for the i-th -1 time, ULiThe voltage magnitude that i ＆ lt sampling is obtained is represented,
Represent the voltage phase angle that i ＆ lt sampling is obtained, ILiRepresent the current amplitude that i ＆ lt sampling is obtained；
For the sampling of wherein i ＆ lt, the voltage phasor obtained using i ＆ lt samplingCurrent data ILiAnd the i-th No. -1 time meter
The amplitude E of the equivalent potential for obtainingeqi-1With the phase angle δ of equivalent potentialeqi-1, it is calculated equivalent potential correctionRoot
Judgment variable Δ Z and angle modification amount Δ δ in the middle of corresponding is calculated according to formula (204)：
And then obtain the correction of equivalent potential
IfAnd Δ Z>0, then
IfAnd Δ Z<0, then
IfAnd Δ Z>0, then
IfAnd Δ Z<0, then
IfThen
In formula,Represent that the i-th -1 time iteration obtains equivalent impedance, Reqi-1The substitutional resistance value that the i-th -1 time iteration of expression is obtained,
Xeqi-1The equivalent reactance value that the i-th -1 time iteration of expression is obtained, ULi-1Represent the i-th -1 time the sample voltage magnitude for obtaining, ILi-1Table
Show the i-th -1 time current amplitude for obtaining of sampling；
The Thevenin's equivalence potential phasor that i ＆ lt sampling is obtained is calculated according to formula (205)
Wherein,The i-th -1 time Thevenin's equivalence potential phasor for obtaining of sampling is represented,Equivalent potential correction is represented,Represent the Thevenin's equivalence potential phasor that i ＆ lt sampling is obtained；
The equivalent impedance phasor after i ＆ lt is sampled is calculated according to formula (211)
Wherein,The Thevenin's equivalence potential phasor that i ＆ lt sampling is obtained is represented,Represent the equivalent resistance after i ＆ lt sampling
Anti- phasor；
I+1 time sampled data is obtained, and repeats said process, calculate real-time Thevenin's equivalence parameter；
Step 102) measuring and calculating Dai Weinan systems equivalent impedance：
Shown in the apparent energy such as formula (206) that load bus under polar coordinate system is obtained：
As shown in formula (207), the active P that load bus absorbsL, reactive power QLRespectively：
In formula, θ represents Equivalent Network impedance angle,Represent load impedance angle, EeqRepresent Thevenin's equivalence electromotive force amplitude；ZeqTable
Show Thevenin's equivalence impedance magnitude, ZLNode load impedance magnitude is represented,Represent node load impedance；Represent Dai Weinan
Equivalent impedance；
Using PLAnd QLTo ZLDerivation, proper ZL=ZeqWhen,Now the active power of line transmission reaches
Maximum PLmaxThe reactive power obtained with load side reaches maximum QLmax, as shown in formula (208)：
Step 103) measuring and calculating modulus of impedance index test value：
According to step 102), when line transmission power is maximum, voltage is in critical stable state, now load impedance and Dai Wei
Southern equivalent impedance value is equal, that is, have formula (209)：
Voltage stability is judged with impedance modular character, index test value is defined as formula (210)：
Step 20) relational expression set up between power margin and impedance modular character, specifically include：
Power margin KPIt is defined as formula (301)：
Convolution (207) and formula (301), obtain KPExpression way, as shown in formula (302)：
Formula (303) can be obtained by formula (210)：
Convolution (302) and formula (303), obtain power margin KPWith impedance modular character VindexBetween relation such as formula (1) shown in：
Step 30) according to the power margin limit value and formula (1) of setting, calculate modulus of impedance metrics-thresholds；
The step 30) in, setting power nargin limit value derives corresponding modulus of impedance metrics-thresholds, and in this, as node
Whether voltage reaches the criterion of the state of emergency, as shown in formula (401)：
Can obtain：
Modulus of impedance metrics-thresholds are 0.358；
Step 40) by step 10) the modulus of impedance desired value and step 30 of all weak nodes in the partition power grid that measures) measure
Modulus of impedance metrics-thresholds are compared, if the modulus of impedance desired value of any one weak node is less than modulus of impedance in partition power grid
Metrics-thresholds, then start dynamic partition scheme；Otherwise the partition power grid voltage security at the moment, return to step 10).
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| CN106684859B (en) * | 2016-11-24 | 2019-07-12 | 东南大学 | A kind of grid short circuit electric current suppressing method based on Dynamic partitioning techniques |
| CN108631290A (en) * | 2017-03-21 | 2018-10-09 | 国家电网公司 | A kind of multi-infeed DC receiving end power grid direct current drop point screening technique |
| CN108493979B (en) * | 2018-03-28 | 2021-01-26 | 国电南瑞科技股份有限公司 | Extra-high voltage direct current access provincial power grid partition optimization operation control method |
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