CN103762600B - A kind of secondary voltage control method based on measuring quality Credibility judgement - Google Patents
A kind of secondary voltage control method based on measuring quality Credibility judgement Download PDFInfo
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- CN103762600B CN103762600B CN201310720081.8A CN201310720081A CN103762600B CN 103762600 B CN103762600 B CN 103762600B CN 201310720081 A CN201310720081 A CN 201310720081A CN 103762600 B CN103762600 B CN 103762600B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a kind of secondary voltage control method based on measuring quality Credibility judgement, comprise the steps: to analyze the maincenter bus determining to participate in the idle control of secondary voltage; Judgment basis is set up to carry out Credibility judgement to the voltage measurements of maincenter bus; Calculate the sensitivity coefficient matrix that all maincenter busbar voltages are exerted oneself relative to controlled generator reactive; Set up the secondary voltage control model of consideration maincenter busbar voltage confidence level, try to achieve the Reactive-power control amount of each controlled generator; According to the Reactive-power control amount of controlled generator, carry out the idle control of secondary voltage.The present invention is only classified as control objectives by minimum for the voltage deviation of " measuring credible maincenter bus ", and the error in measurement avoiding incredible maincenter bus, on the impact of solution strategies correctness, improves the reliability of the idle control of secondary voltage.
Description
Technical field
The present invention relates to a kind of secondary voltage control method based on measuring quality Credibility judgement, belong to power system dispatching technical field.
Background technology
Automatism voltage control (AutomaticVoltageControl) refers under normal operating conditions, by the situation of real time monitoring electric network reactive-load and voltage, carry out on-line optimization calculating, territory, layering and zoning controls electric network reactive-load power supply and relevant device, Optimum Reactive Power Flow distributes, and reaches the object that the whole network voltage is qualified and the whole network active loss is minimum.Existing automatism voltage control comprises voltage order one and controls (PVC, PrimaryVoltageControl), secondary voltage control (SVC, SecondaryVoltageControl) and tertiary voltage control (TVC, TertiaryVoltageControl).
Secondary voltage control is a kind of subregion voltage mode control, by the control strategy set, is responsible for the work coordinating multiple voltage order one control appliance in one's respective area, and tens of second the response time must be greater than to a few minutes the response time that voltage order one controls.Its control objectives is, when the load in system is relative to slowly changing after (versus primary voltage control) or regional network structure change and cause Pilot bus voltage in region to occur offseting, according to the Pilot bus reference voltage that tertiary voltage control device is determined, according to predetermined control strategy, the voltage reference value resetting voltage order one control appliance in region (such as changes the voltage reference value of automatic voltage adjustor of power generator, switched capacitor and reactor, switching load, and locking on-load transformer tap changer etc. if desired), make this area operation under good voltage levvl.
Secondary voltage control pattern based on " Pilot bus " and " control area " is proposed first in 1972 by group of Electricite De France (EDF) on international conference on large HV electric systems.The program is run for many years in practical power systems, achieves appreciable effect.Subsequently, the state such as Italy, Spain, Japan also in succession adopts this scheme and uses till today.
The research of China in automatism voltage control, starts late relative to American-European countries, is just subject to the attention of researcher and operation of power networks personnel in recent years gradually.Jiangsu Power Grid took the lead in 2003 the automatism voltage control achieved in secondary voltage control pattern based on soft sectoring, achieve very large breakthrough and contribution in this respect, its thought is on the basis of layering and zoning, set up typical secondary voltage control model, solve the Reactive-power control amount of generator, carry out voltage & var control.At present, follow-up research is also large mainly with based on this control model.
Deficiency existing for existing secondary voltage control pattern is: the confidence level not considering the voltage measurements of maincenter bus, and the measurement often directly adopting data acquisition and supervisor control (SCADA) to gather carries out voltage & var control as trust data.This just have ignored the impact of measuring quality on voltage & var control, thus causes threat to the safe and reliable operation of regional power system.
Summary of the invention
For the deficiencies in the prior art, technical problem to be solved by this invention is to provide a kind of secondary voltage control method based on measuring quality Credibility judgement.
For realizing above-mentioned goal of the invention, the present invention adopts following technical scheme:
Based on a secondary voltage control method for measuring quality Credibility judgement, comprise the following steps:
S1. the maincenter bus determining to participate in the idle control of secondary voltage is analyzed;
S2. the voltage measurements of judgment basis to described maincenter bus is set up to carry out Credibility judgement;
S3. the sensitivity coefficient matrix that all maincenter busbar voltages are exerted oneself relative to controlled generator reactive is calculated;
S4. set up the secondary voltage control model considering described maincenter busbar voltage confidence level, try to achieve the Reactive-power control amount of each controlled generator;
S5. according to the Reactive-power control amount of described controlled generator, the idle control of secondary voltage is carried out.
Wherein more preferably, the step that the voltage measurements of described maincenter bus carries out Credibility judgement is comprised:
For maincenter bus i, its voltage measurements is V
i, obtain coupled k(k be greater than 2 positive integer) line parameter circuit value of bar branch road and the measuring value of opposite end j, according to the current voltage value V of the maincenter bus i that Branch Power Flow equation can be estimated by jth bar branch road
i (j), by k V
i (j)with V
icompare one by one, and threshold value ε is set
a, ε
afor the quality of voltage that can be set by the user differentiates threshold, it is correlated with from the precision of the measuring instrument of different electric pressure:
(1) if | V
i-V
i (j)| < ε
a, then the magnitude of voltage V being held the maincenter bus i derived by j is thought
i (j)actual amount measured value V can be proved
icredible;
(2) if | V
i-V
i (j)|>=ε
a, then the magnitude of voltage V being held the maincenter bus i derived by j is thought
i (j)actual amount measured value V can be proved
iinsincere.
K bar branch road is judged one by one, the proof V being numbered 1 ~ q can be obtained
ibelievable V
i (j), be numbered the proof V of q+1 ~ k
iincredible V
i (j).
Wherein more preferably, described judgment basis is:
(1) if
then think that the voltage of this maincenter bus measures Vi insincere, now to all V
i (j)distributions judge:
If a. all V
i (j)meet normal distribution N (μ, σ
2), then the end value of this normal distribution 95% confidential interval desirable estimates the upper limit as the voltage that this maincenter bus is current
lower limit
this maincenter bus is classified as " measure and can estimate bus ";
If b. all V
i (j)do not meet normal distribution, then this maincenter bus is classified as " badly measuring bus ";
(2) if
then think that the voltage of this maincenter bus measures V
icredible, this maincenter bus is classified as " measuring credible bus ";
Described " measuring credible bus ", as secondary voltage control target, described " measure and can estimate bus " and described " badly measuring bus " be not as secondary voltage control target.
Wherein more preferably, in case of k=1, first Credibility judgement is carried out to the opposite end bus measuring value on described maincenter bus institute's chord road: if opposite end bus measuring value is credible, then infer whether credible the voltage of this maincenter bus measures; If opposite end bus measuring value is insincere, then direct this maincenter bus to be classified as " bad measure bus ".
Wherein more preferably, the process obtaining described sensitivity coefficient matrix comprises following sub-step:
(1) set generator node type: when solving the sensitivity of maincenter busbar voltage relative to controlled generator A, generator A place node sets is PQ node, and whether other controlled generator nodes participate in voltage order one according to it controls to determine that it is PQ or PV node;
(2) utilize the idle equation with voltage in PQ decomposition method: diagonal element corresponding with PV node in matrix strengthens number to Δ Q=B " Δ V, at B ", then finding the inverse matrix, obtains the electric sensitivity of generator node A for maincenter bus;
Repeat step (1) with step (2), complete the electric sensitivity calculations of all generator nodes, obtain the sensitivity coefficient matrix that maincenter busbar voltage is exerted oneself relative to controlled generator reactive.
Compared with prior art, the present invention has following technical characterstic:
1. in control objectives equation, only be classified as control objectives by minimum for the voltage deviation of " measuring credible maincenter bus ", existing secondary voltage control model is then solve all maincenter buses, avoids the error in measurement of incredible maincenter bus to the impact of solution strategies correctness.
2., in control constraints equation, add the process to " measure and can estimate maincenter bus ", utilize the bound of voltage estimated value to replace concrete magnitude of voltage.Meanwhile, according to user's control overflow setting threshold, the voltage deviation of constraint " bad measurement maincenter bus ", improves the reliability of the idle control of secondary voltage.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of secondary voltage control method provided by the present invention;
Fig. 2 is in the present invention, the schematic flow sheet of measuring quality Credibility judgement.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Shown in Figure 1, secondary voltage control method provided by the present invention comprises the following steps: S1. is by analyzing the maincenter bus determining to participate in the idle control of secondary voltage; S2. Credibility judgement is carried out to the voltage measurements of maincenter bus; S3. according to the admittance matrix equation of the whole network, the sensitivity sytem matrix that all maincenter busbar voltages are exerted oneself relative to controlled generator reactive is obtained; S4. set up the secondary voltage control model of consideration maincenter busbar voltage confidence level, try to achieve the Reactive-power control amount of each restricted generator; S5. secondary voltage adjustment is carried out.Below each concrete steps of this secondary voltage control method are described in detail.
First introduce step S1. and analyze the maincenter bus determining to participate in the idle control of secondary voltage.In this step, utilize conventional method artificially to determine maincenter bus according to actual track, mainly comprise: the high voltage bus of (1) regional water, thermal power plant; (2) secondary bus of Key Substation; (3) the generator voltage bus of a large amount of local load is had.This is the routine techniques means that those of ordinary skill in the art can grasp, and has not just been described in detail at this.
Next introducing step S2. sets up judgment basis to carry out Credibility judgement to the voltage measurements of maincenter bus.Concrete deterministic process in this step as shown in Figure 2, is described as follows:
First maincenter busbar voltage measuring quality Credibility judgement is carried out.Specifically, for maincenter bus i, its voltage measurements is V
i, obtain coupled k(k be greater than 2 positive integer) measuring value of the line parameter circuit value of bar branch road and opposite end j (comprising: meritoriously measure P
j, idle measurement Q
j, voltage measure V
j), determine the sense of current, according to formula:
Wherein j=1,2 ... k.
Can in the hope of the current voltage value V of maincenter bus i estimated by jth bar branch road
i (j), by k V
i (j)with V
icompare one by one, and threshold value ε is set
a, ε
afor the quality of voltage that can be set by the user differentiates threshold, it is correlated with from the precision of the measuring instrument of different electric pressure:
If | V
i-V
i (j)| < ε
a, then the magnitude of voltage V being held the maincenter bus i derived by j is thought
i (j)actual amount measured value V can be proved
icredible;
If | V
i-V
i (j)|>=ε
a, then the magnitude of voltage V being held the maincenter bus i derived by j is thought
i (j)actual amount measured value V can be proved
iinsincere.
K bar branch road is judged one by one, the proof V being numbered 1 ~ q can be obtained
ibelievable V
i (j), be numbered the proof V of q+1 ~ k
iincredible V
i (j).
If
then think that the voltage of this maincenter bus measures V
iinsincere, now utilize computer to make Q-Q diagrammatic representation, using the quantile of sample as abscissa, using the corresponding quantile calculated according to normal distribution as ordinate, sample is shown as the loose point of rectangular coordinate system.If measurement Normal Distribution, then sample point should in one around the cornerwise straight line of first quartile.The method is utilized to check all V
i (j)whether Normal Distribution:
If a. all V
i (j)meet normal distribution N (μ, σ
2), consider the credible scope residing for this bus virtual voltage, the end value of this normal distribution 95% confidential interval desirable estimates the upper limit as the voltage that this maincenter bus is current
lower limit
this maincenter bus is classified as " measure and can estimate bus ";
If b. all V
i (j)do not meet normal distribution, then this maincenter bus is classified as " badly measuring bus ".All not as secondary voltage control target both above-mentioned, but be embodied in constraints.
If
then think that the voltage of this maincenter bus measures V
icredible, this maincenter bus is classified as " measuring credible bus ", i.e. secondary voltage control target.
If it is pointed out that k=1, then utilize recurrence thought, first utilize the opposite end bus measuring value of said method to maincenter bus institute's chord road to carry out Credibility judgement: if opposite end bus measuring value is credible, then infer whether credible the voltage of this maincenter bus measures; If opposite end bus measuring value is insincere, then direct this maincenter bus to be classified as " bad measure bus ".
Utilize said method to measure the voltage of all maincenter buses and carry out Credibility judgement, credible voltage measurements that n bar " measures credible bus " can be obtained, voltage estimate upper lower limit value that m bar " measures and can estimate bus ", and s bar " bad measurement " bus (n, m, s are positive integer), and then set up the secondary voltage control model of consideration maincenter busbar voltage confidence level, carry out secondary voltage control according to Reactive-power control amount.
Next, introduce step S3. and adopt typical electrical network sensitivity method for solving, solve the sensitivity coefficient matrix that all maincenter busbar voltages are exerted oneself relative to controlled generator reactive.In this step, according to the admittance matrix equation of the whole network electrical network, the process obtaining the sensitivity coefficient matrix that all maincenter busbar voltages are exerted oneself relative to controlled generator reactive comprises following sub-step:
Setting generator node type: when solving the sensitivity of maincenter busbar voltage relative to controlled generator A, generator A place node sets is PQ node, and whether other controlled generator nodes participate in voltage order one according to it controls to determine that it is PQ or PV node.For the generator that current Reactive-power control nargin is very little, be set to PQ node.
Utilize the idle equation with voltage in PQ decomposition method: diagonal element corresponding with PV node in matrix strengthens number to Δ Q=B " Δ V, at B ", then finding the inverse matrix, can obtain the electric sensitivity of generator node A for maincenter bus.
Repeat above-mentioned steps, complete the electric sensitivity calculations of all generator nodes, the sensitivity coefficient matrix that maincenter busbar voltage is exerted oneself relative to controlled generator reactive can be obtained
Then, introduce the secondary voltage control model that step S4. sets up consideration maincenter busbar voltage confidence level, try to achieve the Reactive-power control amount of each controlled generator.
According to the result of maincenter busbar voltage measuring quality Credibility judgement, set up and consider that the secondary voltage control model of measuring quality confidence level is:
In above-mentioned formula,
for the Reactive-power control vector of controlled generator;
for controlled generator current idle go out force vector;
be respectively the upper and lower limit value vector that controlled generator reactive is exerted oneself; V
i.nfor n bar measures the current voltage value of credible maincenter bus;
for n bar measures the voltage control desired value of credible maincenter bus; V
i.nmin, V
i.nmaxbe respectively the upper and lower limit value that n bar measures the voltage control target of credible maincenter bus;
for m bar measures the upper and lower limit value that the voltage can estimating maincenter bus measures estimation; V
i.mmin, V
i.mmaxbe respectively m bar and measure the upper and lower limit value can estimating the control objectives of maincenter busbar voltage;
for the sensitivity coefficient matrix that maincenter busbar voltage is exerted oneself relative to controlled generator reactive;
for n bar measures the sensitivity coefficient matrix that credible busbar voltage exerts oneself relative to controlled generator reactive;
for m bar measures the sensitivity coefficient matrix can estimated busbar voltage and exert oneself relative to controlled generator reactive;
the sensitivity coefficient matrix measuring busbar voltage exert oneself relative to controlled generator reactive for s bar is bad;
for the sensitivity coefficient matrix that controlled generator voltage is exerted oneself relative to controlled generator reactive; V
gfor the terminal voltage value that controlled generator is current; V
gmin, V
gmaxbe respectively the upper and lower limit value of controlled generator voltage; Δ V
gfor the maximal regulated step-length of controlled generator voltage; Δ V
sfor the bad maximal regulated amount measuring busbar voltage; α, β are weight coefficient; θ
gfor idle coordinating factor.
Wherein,
v
i.n, V
gfor the operational factor of current electric grid, can Real-time Obtaining;
v
i.nmin, V
i.nmax, V
i.mmin, V
i.mmax, V
gmin, V
gmax, Δ V
g, Δ V
sfor the amount of restraint in secondary voltage control process, by artificially given with the device security guaranteeing electrical network;
provided by tertiary voltage control method; α, β artificially set according to the weight of control objectives; θ
gobtained by typical secondary voltage control method.
After above-mentioned steps completes, the Reactive-power control amount that execution step S5. tries to achieve each controlled generator according to secondary voltage control model assigns instruction, carries out secondary voltage control.The concrete implementation of this step is the conventional techniques means of those of ordinary skill in the art, does not just describe in detail at this.
Compared with prior art, the present invention is by carrying out Credibility judgement to the voltage measurements of all maincenter buses determined, obtain credible voltage measurements that n bar " measures credible bus ", voltage estimate upper lower limit value that m bar " measures and can estimate bus ", and s bar " bad measurement " bus, avoid the error in measurement of insincere maincenter bus to the impact of solution strategies correctness; Add the process to " measure and can estimate maincenter bus ", utilize the bound of voltage estimated value to replace concrete magnitude of voltage; Meanwhile, according to user's control overflow setting threshold, the voltage deviation of constraint " bad measurement maincenter bus ", improves the reliability of the idle control of secondary voltage.
Above the secondary voltage control method based on measuring quality Credibility judgement provided by the present invention is described in detail.For the technical staff in general field, to any apparent change that it does under the prerequisite not deviating from connotation of the present invention, all by formation to infringement of patent right of the present invention, corresponding legal liabilities will be born.
Claims (6)
1., based on a secondary voltage control method for measuring quality Credibility judgement, it is characterized in that comprising the steps:
S1. the maincenter bus determining to participate in the idle control of secondary voltage is analyzed;
S2. the voltage measurements of judgment basis to described maincenter bus is set up to carry out Credibility judgement; Wherein, described maincenter bus is i, and its voltage measurements is V
i, obtain the line parameter circuit value of k bar branch road and the measuring value of opposite end j that are connected with maincenter bus, according to the current voltage value of the maincenter bus i that Branch Power Flow equation jth bar branch road estimates
by k
with V
icompare one by one, and quality of voltage differentiation threshold value ε is set
a;
If
then obtain the magnitude of voltage being held the maincenter bus i derived by j
prove actual amount measured value V
icredible; If
then obtain the magnitude of voltage being held the maincenter bus i derived by j
prove actual amount measured value V
iinsincere;
K bar branch road is judged one by one, obtains the proof V being numbered 1 ~ q
ibelievable
be numbered the proof V of q+1 ~ k
iincredible
wherein k be greater than 2 positive integer;
S3. the sensitivity coefficient matrix that all maincenter busbar voltages are exerted oneself relative to controlled generator reactive is calculated;
S4. set up the secondary voltage control model considering described maincenter busbar voltage confidence level, try to achieve the Reactive-power control amount of each controlled generator;
S5. according to the Reactive-power control amount of described controlled generator, the idle control of secondary voltage is carried out.
2. secondary voltage control method as claimed in claim 1, is characterized in that described judgment basis is:
(1) when
time, then think that the voltage of described maincenter bus measures V
iinsincere, now to all
distributions judge:
A. when all
meet normal distribution N (μ, σ
2) time, then the end value getting this normal distribution 95% confidential interval estimates the upper limit as the voltage that described maincenter bus is current
lower limit
described maincenter bus is classified as " measure and can estimate bus ";
B. when all
when not meeting normal distribution, then this maincenter bus is classified as " badly measuring bus ";
(2) when
time, then think that the voltage of described maincenter bus measures V
icredible, this maincenter bus is classified as " measuring credible bus ".
3. secondary voltage control method as claimed in claim 2, is characterized in that, described " measuring credible bus ", as secondary voltage control target, described " measure and can estimate bus " and described " badly measuring bus " be not as secondary voltage control target.
4. secondary voltage control method as claimed in claim 1, is characterized in that,
In case of k=1, first Credibility judgement is carried out to the opposite end bus measuring value on described maincenter bus institute's chord road: if opposite end bus measuring value is credible, then infer whether credible the voltage of this maincenter bus measures; If opposite end bus measuring value is insincere, then direct this maincenter bus to be classified as " bad measure bus ".
5. secondary voltage control method as claimed in claim 1, is characterized in that the process obtaining described sensitivity coefficient matrix comprises following sub-step:
(1) set generator node type: when solving the sensitivity of maincenter busbar voltage relative to controlled generator A, generator A place node sets is PQ node, and whether other controlled generator nodes participate in voltage order one according to it controls to determine that it is PQ or PV node;
(2) utilize the idle equation with voltage in PQ decomposition method: diagonal element corresponding with PV node in matrix strengthens number to Δ Q=B " Δ V, at B ", then finding the inverse matrix, obtains the electric sensitivity of generator node A for maincenter bus;
Repeat step (1) with step (2), complete the electric sensitivity calculations of all generator nodes, obtain the sensitivity coefficient matrix that maincenter busbar voltage is exerted oneself relative to controlled generator reactive.
6. secondary voltage control method as claimed in claim 1, it is characterized in that, described secondary voltage control model is:
Wherein,
for the Reactive-power control vector of controlled generator;
for controlled generator current idle go out force vector;
be respectively the upper and lower limit value vector that controlled generator reactive is exerted oneself; V
i.nfor n bar measures the current voltage value of credible maincenter bus;
for n bar measures the voltage control desired value of credible maincenter bus; V
i.nmin, V
i.nmaxbe respectively the upper and lower limit value that n bar measures the voltage control target of credible maincenter bus;
for m bar measures the upper and lower limit value that the voltage can estimating maincenter bus measures estimation; V
i.mmin, V
i.mmaxbe respectively m bar and measure the upper and lower limit value can estimating the control objectives of maincenter busbar voltage;
for the sensitivity coefficient matrix that maincenter busbar voltage is exerted oneself relative to controlled generator reactive;
for n bar measures the sensitivity coefficient matrix that credible busbar voltage exerts oneself relative to controlled generator reactive;
for m bar measures the sensitivity coefficient matrix can estimated busbar voltage and exert oneself relative to controlled generator reactive;
the sensitivity coefficient matrix measuring busbar voltage exert oneself relative to controlled generator reactive for s bar is bad;
for the sensitivity coefficient matrix that controlled generator voltage is exerted oneself relative to controlled generator reactive; V
gfor the terminal voltage value that controlled generator is current; V
gmin, V
gmaxbe respectively the upper and lower limit value of controlled generator voltage; Δ V
gfor the maximal regulated step-length of controlled generator voltage; Δ V
sfor the bad maximal regulated amount measuring busbar voltage; α, β are weight coefficient; θ
gfor idle coordinating factor.
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