CN102035205A - Method for evaluation of voltage reactive operation state of high voltage distribution network - Google Patents

Abstract

The invention discloses a method for the evaluation of voltage reactive operation state of a high voltage distribution network, which comprises the steps of: (1) acquiring and subjecting model data of the high voltage distribution network to topology analysis and modeling, collecting real-time SCADA data of the network based on the unit of typical day and performing state estimation; (2) on the basis of the above SCADA data, taking statistics on various indexes by utilizing an evaluation index system for the voltage reactive operation state of the high voltage distribution network; and (3) according to the statistical indexes and the evaluation system for the voltage reactive operation state, the voltage reactive operation state of the high voltage distribution network is evaluated based on the unit of typical day, wherein the evaluation index system for the voltage reactive operation state of the high voltage distribution network in the step (2) comprises a reactive control capability evaluation index and a voltage control capability evaluation index as well as respective four specific indexes of both. The method has the advantage of evaluating the high voltage distribution network more comprehensively and in more details, thereby promoting the operation stability and safety of the high voltage distribution network better.

Description

A kind of appraisal procedure of high voltage distribution network voltage power-less running status

Technical field

The present invention relates to the quality of voltage of high voltage distribution network and the appraisal procedure of voltage power-less running status.

Background technology

High voltage distribution network is the tie that connects power transmission network and medium voltage distribution network, it is carried out rational reactive compensation capacity configuration, adopt effective voltage power-less control measure, can not only guarantee the high voltage distribution network quality of voltage, improve the stability and the fail safe of operation, and can reduce the electrical network electric energy loss, and improve the equipment ability to transmit electricity, give full play to the economical operation benefit of high voltage distribution network.Thereby to high voltage distribution network, be necessary to set up cover evaluation system, corresponding index and an appraisal procedure, come its quality of voltage and reactive power running statuses such as (hereinafter to be referred as " idle ") are assessed and managed, with foundation as further planning or transformation high voltage distribution network.

The most ripe at present, also be that the index of the most frequently used evaluation system is power factor qualification rate and rate of qualified voltage.Wherein, power factor qualification rate and rate of qualified voltage are defined as:

The power factor qualification rate of general provision area power grid critical point load should be not less than 95% (each department power supply administration also can adjust according to this area actual conditions and formulate the power factor qualification rate), and the rate of qualified voltage of each voltage level of general provision electrical network is not less than 97%.Yet for the operation characteristic of the high voltage distribution network of reality, this most frequently used evaluation system and index thereof can't be assessed its voltage power-less running status comprehensively and subtly to high voltage distribution network.Application number is 2010102733117, name is called the patent application of the appraisal procedure of running status " a kind of high voltage distribution network voltage power-less configuration with ", proposed a kind of method that high voltage distribution network voltage power-less configuring condition and running status are assessed, this method is day to be the voltage power-less running status of unit from the angle evaluating system of idle configuration with the typical case.To a certain extent, also obtained the effect of assessing configuration of high voltage distribution network voltage power-less and running status comprehensively and subtly really.But, because this method is only removed evaluating system from the angle of idle configuration voltage power-less running status, can't be evaluated at the typical case in a few days voltage and idle running status control situation and with match condition when preload, also can't assess the action situation of voltage and idle conditioning equipment.So, its assessment as further planning or transform high voltage distribution network according to aspect, just lack more fully foundation, thus aspect stability that promotes the high voltage power distribution network operation and fail safe still existence deficiency also.

Summary of the invention

The objective of the invention is, overcome the deficiencies in the prior art, propose a kind of while can be evaluated at the typical case in a few days voltage and idle running status control situation and with match condition when preload, the appraisal procedure of the high voltage distribution network voltage power-less running status of the action situation of assessment voltage and idle conditioning equipment.

For realizing described purpose, provide a kind of like this appraisal procedure of high voltage distribution network voltage power-less running status; This method comprises following three steps:

(1) model data of obtaining high voltage distribution network is carried out topological analysis and modeling, day is unit SCADA data and carry out state estimation when collecting this network implementation with the typical case;

(2) based on above SCADA data, utilize high voltage distribution network voltage power-less running status evaluation index system, carry out the statistics of each index;

(3) by each statistical indicator, day be unit with the typical case, based on voltage power-less running status appraisement system, estimate the voltage power-less running status of high voltage distribution network;

In step (1), described typical case the day is meant high voltage distribution network in running the most representative one day; The SCADA data comprise at least during network implementation, circuit and bus power and current data, the idle data of capacitor, transformer gear data and transformer data;

Its improvements are: the described high voltage distribution network voltage power-less of step (2) running status evaluation index system, in a few days set up at the voltage of each transformer of high voltage distribution network the whole network and the control situation of Reactive Power Control equipment a typical case, this high voltage distribution network voltage power-less running status evaluation index system comprises idle control ability evaluation index and voltage control capability evaluation index;

Wherein, in described idle control ability evaluation index, comprise following four specific targets:

1. power factor qualification rate

It is defined as:

2. idle control/undercompensation rate

Be located at k constantly, the high-pressure side power factor of the j platform transformer of the i of transformer station is in the high voltage distribution network

Then

$E_{\mathrm{RORC}}=\frac{T_{\mathrm{ER}}}{N}\×100\%$

$L_{\mathrm{RORC}}=\frac{T_{\mathrm{LR}}}{N}\×100\%$

Wherein: E _RORCBe idle control overcompensation rate; L _RORCBe idle control undercompensation rate; T _ER, T _LRBe respectively in a few days idle control overcompensation and the under-compensated moment number of idle control of typical case, it is as follows that their moment is counted determining step: all putting initial value earlier is T _ER=0, T _LR=0, then whether each idle total capacity of the moment is satisfied the power factor examination and require to estimate, if meet the demands then T _ER(or T _LR)=T _ER(or T _LR)+1 is not satisfied and is not then added up, and continues to estimate next then constantly; To each method that constantly whether exists no merits and demerits/undercompensation to examine be, be located at certain constantly k (k=1,2 ... in the time of N), for single transformer, if

And if excise 1 group or multiple unit capacitor or drop into 1 group or organize reactor more after, satisfy

Then k is the idle control overcompensation moment; If

And if drop into behind 1 group or the multiple unit capacitor or excise 1 group or organize reactor more after, satisfy

Then k is the idle control undercompensation moment; Idle control/undercompensation rate to the whole network transformer examination point is got idle control/undercompensation rate that weighted average can obtain the whole network;

3. power factor load matching degree (L _MDOP)

$L_{\mathrm{MDOPF}}=\frac{T_{\mathrm{PF}}}{N}100\%$

T in the formula _PFIn a few days peak, low ebb moment power factor satisfy the moment quantity that the load weight carries power factor expectation under the situation for the typical case; This definite step of moment number that satisfies power factor expectation is as follows: putting initial value earlier is T _PF=0, then whether each idle total capacity of the moment is satisfied the power factor examination and require to estimate, if meet the demands then T _PF=T _PF+ 1, do not satisfy and then do not add up, continue to estimate next then constantly; To each method that judges whether to satisfy the power factor expectation constantly be, be located at certain constantly k (k=1,2 ... in the time of N), for single transformer, if during peak period

Then k is the moment that power factor satisfies power factor expectation under the load heavy duty; If during low-valley interval Then k is the moment that power factor satisfies power factor expectation under the load underloading; The power factor load matching degree of the whole network transformer examination point is got the power factor load matching degree that weighted average can obtain the whole network;

4. compensator action frequency exceeding standard rate

If the j platform transformer of the i of transformer station actual act number of times of compensator in specified time period is T _Ij, be limited to T on the action frequency _Max, then

$E_{\mathrm{ROC}}=\max \{\frac{T_{\mathrm{ij}}-T_{\max }}{T_{\max }}100\%,0\};$

In described voltage control capability evaluation index, comprise following four specific targets:

1. rate of qualified voltage index

It is defined as:

2. overtension/mistake is hanged down rate

It is defined as:

3. transformer tapping action frequency exceeding standard rate (E _ROT)

If the j platform transformer of the i of transformer station actual act number of times of transformer tapping in specified time period is Tr in the high voltage distribution network _Ij, be limited to T on the action frequency _Rmax, then

$E_{\mathrm{ROT}}=\max \{\frac{{\mathrm{Tr}}_{\mathrm{ij}}-{\mathrm{Tr}}_{\max }}{{\mathrm{Tr}}_{\max }}100\%,0\}$

4. the backbone point inverse regulation voltage satisfies rate (S _RORV)

Be located at k constantly, rated voltage and the virtual voltage of backbone point i are respectively U _NAnd U _I-k, then

$S_{\mathrm{RORV}}=\frac{T_{\mathrm{RV}}}{N}100\%$

T in the formula _RVFor the typical case in a few days backbone point satisfy the moment quantity of inverse regulation voltage principle; Definite step that this inverse regulation voltage satisfies moment number constantly is as follows: putting initial value earlier is T _RV=0, whether each moment inverse regulation voltage is met the demands estimate then, if meet the demands then T _RV=T _RV+ 1, do not satisfy and then do not add up, continue to estimate next then constantly; Judge each constantly the method that whether meets the demands of inverse regulation voltage be, be located at certain constantly k (k=1,2 ... N) time, satisfy 1.07U peak period _N＞U _I-k＞1.03U _NOr low-valley interval satisfies 1.03U _N＞U _I-k＞U _N, then k is for satisfying the backbone point inverse regulation voltage constantly; The inverse regulation voltage of all backbone points of the whole network is satisfied rate to be got the backbone point inverse regulation voltage that weighted average can obtain the whole network and satisfies rate.

From scheme as can be seen, the present invention is in conjunction with existing evaluation index, and object is proposed clearly, power factor load matching degree index and backbone point inverse regulation voltage satisfy the rate index and form the complete index system of a cover intuitively, these evaluation indexes not only can be from voltage and idle running status control aspect reaction high voltage distribution network voltage and reactive power operation state, and can reflect running status and the match condition of working as preload, judge whether electrical network is in desirable running status, track out voltage and idle conditioning equipment and have the not enough place of control.Therefore, compared with prior art, the present invention can assess running status control situation and with match condition when preload, the high voltage distribution network voltage power-less running status of the action situation of assessment voltage and idle conditioning equipment.And a typical case in a few days at the voltage of each transformer of high voltage distribution network the whole network and the control situation of Reactive Power Control equipment, comprise power factor and voltage the control effect, comprise the actual act number of times T of compensator in the specified time period _IjAnd the actual act number of times of transformer tapping is Tr in the specified time period _IjAnd after setting up appraisement system of the present invention, its evaluation result is very representative, can provide comprehensive, meticulous foundation for the improvement of voltage and idle conditioning equipment control strategy, also being further planning or transforming high voltage distribution network provides comprehensive, meticulous foundation.

The present invention is further illustrated below in conjunction with accompanying drawing.

Description of drawings

Fig. 1---high voltage distribution network voltage power-less running status evaluation index system

Fig. 2---Yuhang high voltage distribution network structure chart

Embodiment

A kind of appraisal procedure of high voltage distribution network voltage power-less running status; This method comprises following three steps:

(1) model data of obtaining high voltage distribution network is carried out topological analysis and modeling, day is unit SCADA data and carry out state estimation when collecting this network implementation with the typical case, has higher accuracy so that generate data;

(2) based on above SCADA data, utilize high voltage distribution network voltage power-less running status evaluation index system, carry out the statistics of each index;

(3) by each statistical indicator, day be unit with the typical case, based on voltage power-less running status appraisement system, estimate the voltage power-less running status of high voltage distribution network;

In step (1), described typical case the day is meant high voltage distribution network in running the most representative one day; The SCADA data comprise at least during network implementation, circuit and bus power and current data, the idle data of capacitor, transformer gear data and transformer data;

In the present invention: the described high voltage distribution network voltage power-less of step (2) running status evaluation index system (with reference to figure 1), in a few days set up at the voltage of each transformer of high voltage distribution network the whole network and the control situation of Reactive Power Control equipment a typical case, this high voltage distribution network voltage power-less running status evaluation index system comprises idle control ability evaluation index and voltage control capability evaluation index;

Wherein, in described idle control ability evaluation index, comprise following four specific targets:

1. power factor qualification rate

It is defined as:

2. idle control/undercompensation rate

Idle control overcompensation rate is used to assess the typical case and in a few days causes examining a power factor to cross the situation of the upper limit owing to excessively dropping into capacitor or excessively excising reactor; Idle control undercompensation rate is used to assess the typical case and in a few days causes examining a power factor to be lower than the situation of lower limit owing to dropping into capacitor less or excising reactor less.Be located at k constantly, the high-pressure side power factor of the j platform transformer of the i of transformer station is in the high voltage distribution network

Then

$E_{\mathrm{RORC}}=\frac{T_{\mathrm{ER}}}{N}\×100\%---\left(7\right)$

$L_{\mathrm{RORC}}=\frac{T_{\mathrm{LR}}}{N}\×100\%---\left(8\right)$

Wherein: E _RORCBe idle control overcompensation rate; L _RORCBe idle control undercompensation rate; T _ER, T _LRBe respectively in a few days idle control overcompensation and the under-compensated moment number of idle control of typical case, it is as follows that their moment is counted determining step: all putting initial value earlier is T _ER=0, T _LR=0, then whether each idle total capacity of the moment is satisfied the power factor examination and require to estimate, if meet the demands then T _ER(or T _LR)=T _ER(or T _LR)+1 is not satisfied and is not then added up, and continues to estimate next then constantly; To each method that constantly whether exists no merits and demerits/undercompensation to examine be, be located at certain constantly k (k=1,2 ... in the time of N), for single transformer, if And if excise 1 group or multiple unit capacitor or drop into 1 group or organize reactor more after, satisfy Then k is the idle control overcompensation moment; If

And if drop into behind 1 group or the multiple unit capacitor or excise 1 group or organize reactor more after, satisfy

Then k is the idle control undercompensation moment; Idle control/undercompensation rate to the whole network transformer examination point is got idle control/undercompensation rate that weighted average can obtain the whole network;

3. power factor load matching degree (L _MDOP)

In service in actual electric network, peak and the low ebb load period, the examination of power factor was required and operation is contemplated to be different, as power factor examination peak period scope is 0.95～1pu, during low ebb 0.93～0.97pu, and the upper limit of expectation peak hours power factor deflection examination scope, the lower limit of deflection examination scope during the low ebb load; Therefore, except the power factor qualification rate, also be necessary to assess power factor and can satisfy the load weight and carry power factor expectation and satisfaction degree thereof under the situation, i.e. power factor load matching degree.

$L_{\mathrm{MDOPF}}=\frac{T_{\mathrm{PF}}}{N}100\%---\left(9\right)$

T in the formula _PFIn a few days peak, low ebb moment power factor satisfy the moment quantity that the load weight carries power factor expectation under the situation for the typical case; This definite step of moment number that satisfies power factor expectation is as follows: putting initial value earlier is T _PF=0, then whether each idle total capacity of the moment is satisfied the power factor examination and require to estimate, if meet the demands then T _PF=T _PF+ 1, do not satisfy and then do not add up, continue to estimate next then constantly; To each method that judges whether to satisfy the power factor expectation constantly be, be located at certain constantly k (k=1,2 ... in the time of N), for single transformer, if during peak period

Then k is the moment that power factor satisfies power factor expectation under the load heavy duty; If during low-valley interval Then k is the moment that power factor satisfies power factor expectation under the load underloading; The power factor load matching degree of the whole network transformer examination point is got the power factor load matching degree that weighted average can obtain the whole network;

4. compensator action frequency exceeding standard rate

Be mainly used in the assessment capacitor, whether reactor acts frequently and the degree of frequent movement.If the j platform transformer of the i of transformer station actual act number of times of compensator in specified time period is T _Ij, be limited to T on the action frequency _Max, then

$E_{\mathrm{ROC}}=\max \{\frac{T_{\mathrm{ij}}-T_{\max }}{T_{\max }}100\%,0\}---\left(10\right);$

In described voltage control capability evaluation index, comprise following four specific targets:

1. rate of qualified voltage index

It is defined as:

2. overtension/mistake is hanged down rate

Be to carry out to such an extent that distinguish to the defective situation of voltage, it is defined as with becoming more meticulous:

In the formula, the voltage acceptability limit had done to be defined in this and not do and give unnecessary details to the voltage acceptability limit of each electric pressure in various standards and guide rule;

3. transformer tapping action frequency exceeding standard rate (E _ROT)

Be mainly used in whether the assessment transformer tapping acts frequently and the degree of frequent movement.If the j platform transformer of the i of transformer station actual act number of times of transformer tapping in specified time period is Tr in the high voltage distribution network _Ij, be limited to Tr on the action frequency _Max, then

$E_{\mathrm{ROT}}=\max \{\frac{{\mathrm{Tr}}_{\mathrm{ij}}-{\mathrm{Tr}}_{\max }}{{\mathrm{Tr}}_{\max }}100\%,0\}---\left(12\right)$

4. the backbone point inverse regulation voltage satisfies rate (S _RORV)

The idle control of main assessment virtual voltage makes backbone point satisfy the degree of inverse regulation voltage principle; The inverse regulation voltage principle is: backbone point voltage raises 5% at peak hours than rated voltage, drops to rated voltage when low ebb is loaded.Be located at k constantly, rated voltage and the virtual voltage of backbone point i are respectively U _NAnd U _I-k, then

$S_{\mathrm{RORV}}=\frac{T_{\mathrm{RV}}}{N}100\%---\left(13\right)$

T in the formula _RVFor the typical case in a few days backbone point satisfy the moment quantity of inverse regulation voltage principle; Definite step that this inverse regulation voltage satisfies moment number constantly is as follows: putting initial value earlier is T _RV=0, whether each moment inverse regulation voltage is met the demands estimate then, if meet the demands then T _RV=T _RV+ 1, do not satisfy and then do not add up, continue to estimate next then constantly; Judge each constantly the method that whether meets the demands of inverse regulation voltage be, be located at certain constantly k (k=1,2 ... N) time, satisfy 1.07U peak period _N＞U _I-k＞1.03U _NOr low-valley interval satisfies 1.03U _N＞U _I-k＞U _N, then k is for satisfying the backbone point inverse regulation voltage constantly; The inverse regulation voltage of all backbone points of the whole network is satisfied rate to be got the backbone point inverse regulation voltage that weighted average can obtain the whole network and satisfies rate.

In step (3), as follows for its evaluation criterion of the described evaluation index of step (2):

Aspect idle control ability assessment:

1. the power factor qualification rate is estimated, and its standard both can also can be adjusted its standard according to the situation in practice area according to general standard (be introduce in the background technology be not less than 95%);

The evaluation of 2. idle control/undercompensation rate, the typical case in a few days, if idle control overcompensation rate E _RORC, idle control undercompensation rate L _RORCBe zero, show that the reactive power compensation control strategy is proper; If it is non-vanishing, it is incorrect to show that then the reactive power compensation control strategy of this transformer is formulated, thereby causes power factor out-of-limit, works as E especially _RORCOr L _RORCBe 100%, need revise this moment to this transformer reactive power compensation control strategy, promptly corresponding to the non-vanishing situation of idle overcompensation rate, need heighten the setting value of reactive-load compensation equipment action, corresponding to the non-vanishing situation of idle undercompensation rate, need turn down the setting value of reactive-load compensation equipment action;

3. the evaluation of power factor load matching degree, L _MDOPFHigh more, more near 100%, show that then power factor is high more with the expected degree that is complementary of load; L _MDOPFLow more, more near 0%, it is perfect inadequately to show that then the reactive power compensation control strategy of this transformer is formulated, thereby causes power factor not high with the expected degree that load is complementary, and can consider the reactive power compensation control strategy of this transformer is improved this moment;

4. if the evaluation of compensator action frequency exceeding standard rate is compensator action frequency exceeding standard rate E _ROCBe 0%, show that there is not the action frequency problem that exceeds standard in compensator; If compensator action frequency exceeding standard rate E _ROCBe not 0%, then this compensator exists the problem that acts frequently, E _ROCBig more, show that the degree of acting frequently is serious more, works as E _ROCGreater than 100% o'clock, show that the degree of acting frequently is too serious, the operations staff should consider compensator is withdrawed from automatic adjusting, carries out manual adjustments;

Aspect voltage control:

1. rate of qualified voltage evaluation, its standard is as the criterion according to general standard (be introduce in the background technology be not less than 97%);

2. the evaluation of the low rate of overtension/mistake, the typical case in a few days, if overtension/low rate keeps higher level, it is incorrect to show that then this transformer tapping is regulated, thereby cause the defective of voltage levvl, need revise this moment to this transformer voltage control strategy: if there is the overtension problem, then need suitably to heighten transformer tapping, if there is the brownout problem, then need suitably to turn down transformer tapping;

3. if the evaluation of transformer tapping action frequency exceeding standard rate is transformer tapping action frequency exceeding standard rate E _ROTBe not 0, then this compensator exists the problem that acts frequently, E _ROCBig more, show that the degree of acting frequently is serious more, works as E _ROTGreater than 100% o'clock, show that the degree of acting frequently is too serious, the operations staff should consider transformer tapping is withdrawed from automatic adjusting, carries out locking;

4. the backbone point inverse regulation voltage satisfies the evaluation of rate, S _RORVHigh more, more near 100%, show then that backbone point inverse regulation voltage situation is unreasonable and think that voltage levvl is good more; This backbone point inverse regulation voltage satisfies that rate examination also can be divided into peak period and low-valley interval is examined respectively; If S _RORVLow more, more near 0%, then show can't better mating that the voltage control strategy of this backbone point formulates with current load condition, thereby it is not high to cause backbone point to satisfy the degree of inverse regulation voltage principle, and can consider the voltage control strategy of this backbone point is improved this moment.

Experimental verification:

Adopt Yuhang, Zhejiang Province office actual electric network as research object below, this evaluation index verified:

Yuhang, Zhejiang electrical network of at first choosing on January 25th, 2009 (minimum load typical case day in winter) and July 16 (peak load typical case day in summer) is that object carries out idle running status assessment.This electrical network has 3 220kV transformer stations and 13 110kV transformer stations.220, the total capacity of 110kV transformer station be respectively 1200,1019MVA, the total capacity of institute's installation capacitor is respectively 139.2,271.8Mvar, and reactor all is not installed.The typical case day down, Yuhang electrical network can be divided into the continent and become to become for district and horizontal mountain range for district, universe unit and become the high voltage distribution networks independently for 3 in district, as shown in Figure 2.This section will be chosen representative universe unit change and be analyzed for the district.

Universe unit becomes the voltage power-less running status assessment result for the district:

According to Yuhang Power Supply Bureau action frequency regulation, main transformer tap motion limits number of times is in Yuhang electrical network 1 day: 0:00-7:00 is 4 times, and 7:00-10:00 is 4 times, and 10:00-22:00 is 8 times, and 22:00-24:00 is 2 times; The action frequency restriction of 1 day inner capacitor is divided into according to the difference of installation main transformer electric pressure: 10 times (220kV), 24 times (110kV).The change of universe unit sees Table 3 for district and main transformer voltage power-less running status assessment result.

Aspect idle control ability, as shown in Table 1, the power factor qualification rate of fishing bridge 1#, 2# main transformer is respectively 87.7%, 95.5%, and all not too high, this causes (E by idle overcompensation _RORC=12.3%, 4.5%), reason is that there is excessive input in the low ebb load period or does not have excision capacitor in time.In the qualified period of power factor, reactive power compensation control and the better (L of load coupling _MDOPF＞80%), most of moment can be with power factor controlling in ideal range.By E _ROCIndex as can be known, all there are frequent movement problem (E in the 3# of 2 main transformers of fishing bridge, 4# capacitor _ROC=295.8%, 266.7%), by evaluation criterion as can be known, damages, need its VQC (Voltage Quality Control, voltage power-less control) device is withdrawed from automatic adjusting, carry out manual adjustments for avoiding compensator.

Table 1 universe unit becomes for district and main transformer voltage power-less control ability assessment result

Annotate: E _ROTIn the index, the main transformer tap action frequency exceeding standard rate that a, b, c, d are illustrated respectively in 4 moment is a%, b%, c%, d%.

Aspect voltage control capability, there were low and too high problem respectively in fishing bridge 1#, 2# main transformer voltage, thereby rate of qualified voltage is all not high, and the also undesirable (S of inverse regulation voltage situation _RORV＜45%).During the 22:00-24:00, the problem that fishing bridge 1#, 2# main transformer exist main transformer tap action frequency to exceed standard.By analysis, this problem mainly is because the load peak-valley difference is excessive, and voltage fluctuation causes more greatly, and especially during 22:00-24:00,2 main transformer taps are because voltage levvl is on the low side, need to connect transfer many grades qualified to keep voltage.During the 22:00-24:00, the problem that Qiu Shan 1#, 2# main transformer also exist main transformer tap action frequency to exceed standard.This voltage power-less control ability assessment result of distinguishing all the other each main transformers is comparatively desirable.

Utilize this evaluation index system to supply district and continent to become the assessment of carrying out from the main transformer to the whole network for distinguishing to first change of the universe of Yuhang high voltage distribution network for district, the change of horizontal mountain range, can not only reflect the voltage power-less operation conditions of whole high voltage distribution network and work as the coupling of preload, more can utilize the evaluation index that becomes more meticulous to track out voltage and idle conditioning equipment and exist control to have not enough place, for the fine-grained management of voltage power-less running status provides the theoretical foundation of improving control strategy.

Claims (1)

1. the appraisal procedure of a high voltage distribution network voltage power-less running status; This method comprises following three steps:

(1) model data of obtaining high voltage distribution network is carried out topological analysis and modeling, day is unit SCADA data and carry out state estimation when collecting this network implementation with the typical case;

(2) based on above SCADA data, utilize high voltage distribution network voltage power-less running status evaluation index system, carry out the statistics of each index;

(3) by each statistical indicator, day be unit with the typical case, based on voltage power-less running status appraisement system, estimate the voltage power-less running status of high voltage distribution network;

In step (1), described typical case the day is meant high voltage distribution network in running the most representative one day; The SCADA data comprise at least during network implementation, circuit and bus power and current data, the idle data of capacitor, transformer gear data and transformer data;

It is characterized in that: the described high voltage distribution network voltage power-less of step (2) running status evaluation index system, in a few days set up at the voltage of each transformer of high voltage distribution network the whole network and the control situation of Reactive Power Control equipment a typical case, this high voltage distribution network voltage power-less running status evaluation index system comprises idle control ability evaluation index and voltage control capability evaluation index;

Wherein, in described idle control ability evaluation index, comprise following four specific targets:

1. power factor qualification rate

It is defined as:

2. idle control/undercompensation rate

Be located at k constantly, the high-pressure side power factor of the j platform transformer of the i of transformer station is in the high voltage distribution network

Then

$E_{\mathrm{RORC}}=\frac{T_{\mathrm{ER}}}{N}\×100\%$

$L_{\mathrm{RORC}}=\frac{T_{\mathrm{LR}}}{N}\×100\%$

Wherein: E _RORCBe idle control overcompensation rate; L _RORCBe idle control undercompensation rate; T _ER, T _LRBe respectively in a few days idle control overcompensation and the under-compensated moment number of idle control of typical case, it is as follows that their moment is counted determining step: all putting initial value earlier is T _ER=0, T _LR=0, then whether each idle total capacity of the moment is satisfied the power factor examination and require to estimate, if meet the demands then T _ER(or T _LR)=T _ER(or T _LR)+1 is not satisfied and is not then added up, and continues to estimate next then constantly; To each method that constantly whether exists no merits and demerits/undercompensation to examine be, be located at certain constantly k (k=1,2 ... in the time of N), for single transformer, if And if excise 1 group or multiple unit capacitor or drop into 1 group or organize reactor more after, satisfy

Then k is the idle control overcompensation moment; If

And if drop into behind 1 group or the multiple unit capacitor or excise 1 group or organize reactor more after, satisfy

Then k is the idle control undercompensation moment; Idle control/undercompensation rate to the whole network transformer examination point is got idle control/undercompensation rate that weighted average can obtain the whole network;

3. power factor load matching degree (L _MDOP)

$L_{\mathrm{MDOPF}}=\frac{T_{\mathrm{PF}}}{N}100\%$

T in the formula _PFIn a few days peak, low ebb moment power factor satisfy the moment quantity that the load weight carries power factor expectation under the situation for the typical case; This definite step of moment number that satisfies power factor expectation is as follows: putting initial value earlier is T _PF=0, then whether each idle total capacity of the moment is satisfied the power factor examination and require to estimate, if meet the demands then T _PF=T _PF+ 1, do not satisfy and then do not add up, continue to estimate next then constantly; To each method that judges whether to satisfy the power factor expectation constantly be, be located at certain constantly k (k=1,2 ... in the time of N), for single transformer, if during peak period

Then k is the moment that power factor satisfies power factor expectation under the load heavy duty; If during low-valley interval

Then k is the moment that power factor satisfies power factor expectation under the load underloading; The power factor load matching degree of the whole network transformer examination point is got the power factor load matching degree that weighted average can obtain the whole network;

4. compensator action frequency exceeding standard rate

If the j platform transformer of the i of transformer station actual act number of times of compensator in specified time period is T _Ij, be limited to T on the action frequency _Max, then

$E_{\mathrm{ROC}}=\max \{\frac{T_{\mathrm{ij}}-T_{\max }}{T_{\max }}100\%,0\};$

In described voltage control capability evaluation index, comprise following four specific targets:

1. rate of qualified voltage index

It is defined as:

2. overtension/mistake is hanged down rate

It is defined as:

3. transformer tapping action frequency exceeding standard rate (E _ROT)

If the j platform transformer of the i of transformer station actual act number of times of transformer tapping in specified time period is Tr in the high voltage distribution network _Ij, be limited to Tr on the action frequency _Max, then

$E_{\mathrm{ROT}}=\max \{\frac{{\mathrm{Tr}}_{\mathrm{ij}}-{\mathrm{Tr}}_{\max }}{{\mathrm{Tr}}_{\max }}100\%,0\}$

4. the backbone point inverse regulation voltage satisfies rate (S _RORV)

Be located at k constantly, rated voltage and the virtual voltage of backbone point i are respectively U _NAnd U _I-k, then

$S_{\mathrm{RORV}}=\frac{T_{\mathrm{RV}}}{N}100\%$

T in the formula _RVFor the typical case in a few days backbone point satisfy the moment quantity of inverse regulation voltage principle; Definite step that this inverse regulation voltage satisfies moment number constantly is as follows: putting initial value earlier is T _RV=0, whether each moment inverse regulation voltage is met the demands estimate then, if meet the demands then T _RV=T _RV+ 1, do not satisfy and then do not add up, continue to estimate next then constantly; Judge each constantly the method that whether meets the demands of inverse regulation voltage be, be located at certain constantly k (k=1,2 ... N) time, satisfy 1.07U peak period _N＞U _I-k＞1.03U _NOr low-valley interval satisfies 1.03U _N＞U _I-k＞U _N, then k is for satisfying the backbone point inverse regulation voltage constantly; The inverse regulation voltage of all backbone points of the whole network is satisfied rate to be got the backbone point inverse regulation voltage that weighted average can obtain the whole network and satisfies rate.

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