CN104779625B - Capacitive reactive compensation configuration method for 110kV transformer substation in saturated load region - Google Patents

Abstract

The invention discloses a capacitive reactive compensation configuration method for an 110kV transformer substation in a saturated load region. The method specifically comprises the following steps: (1) acquiring the main transformer number n of the 110kV transformer substation, wherein i is equal to 1-n; (2) collecting the model parameters of each main transformer, wherein the model parameters comprise rated capacity SN, no-load current percentage I0% and short-circuit voltage percentage VS%; (3) acquiring the highest active load average value Pav and the power factor average value cosphiav of each main transformer in a power supply region in each month all the year; (4) calculating the capacitive reactive compensation QCi of each main transformer and calculating the sum of QCi of n transformers as the capacitive reactive compensation of the 110kV transformer substation. The method disclosed by the invention is suitable for planning the capacitive reactive compensation of the existing 110kV transformer substation in the saturated load region, therefore, local reactive power balancing is facilitated and a lot of reactive-load compensation equipment is prevented from being idled.

Description

Saturation loading region 110kV transformer stations capacitive reactive power compensation collocation method

Technical field

The present invention relates to the reactive power compensation technology field of transformer station, more particularly to saturation loading region 110kV transformer stations Capacitive reactive power compensation capacity collocation method.

Background technology

South China grid voltage quality and var administrative standard require that the idle configuration of power system should ensure that Under system burden with power peak and the load valley method of operation, the reactive balance of layering and zoning.The capacitive of 110kV transformer stations without Work(is compensated based on compensator transformer reactive loss, and suitably takes into account the reactive-load compensation of load side, and capacitive reactive power compensation configuration is pressed 10%～30% configuration of main transformer capacity.

Reactive-load compensation is configured according to the principle there is simple and convenient, workable advantage, but the principle does not have More optimal configuration is made according to the reactive balance demand of different reactive voltage characteristic electrical networks, causes some transformer stations to compensate Degree, and the not enough problem of some transformer station's compensation.Therefore, the present invention starts with from idle in-situ balancing angle, for different electrical networks Power supply level research differentiation capacitive reactive power compensation.

Additionally, some capacitive reactive power compensation capacity collocation methods, are the extreme operation sides maximum according to annual load is met The reactive requirement of formula goes configuration, this method that the utilization rate of annual capacitor equipment may be caused low.Therefore, the present invention is to take into account Capacitive reactive power compensates the utilization power of equipment, it is contemplated that the load level in annual each month.

The content of the invention

It is an object of the invention to overcome the shortcoming and deficiency of prior art, there is provided a kind of saturation loading region 110kV becomes Power station capacitive reactive power compensation capacity collocation method.

The purpose of the present invention is realized by following technical scheme：

A kind of saturation loading region 110kV transformer stations capacitive reactive power compensation capacity collocation method, it is characterised in that comprising with The step of lower order：

S1. the main transformer number n of 110kV transformer stations is obtained, i=1 is made；

S2. obtain number of windings m of i-th main transformer；

S3. m is judged whether equal to 2, be then execution step S4, otherwise execution step S8；

S4. the model parameter of i-th main transformer is gathered, described model parameter includes the rated capacity of main transformer S_N, no-load current percent I₀% and short-circuit voltage percent V_S%；

S5. obtain average value P of i-th main transformer power supply area in the highest burden with power of annual each moon_aviWith it is corresponding The meansigma methodss of power factor

S6. calculate i-th main transformer capacitive reactive power compensation dosage Q_Ci；

S7. i is judged whether equal to n, be then execution step S9, otherwise make i=i+1, and return to step S2；

S8. the model parameter of i-th main transformer is gathered, described model parameter includes the rated capacity of main transformer S_N, no-load current percent I₀%, height-low short-circuit voltage percent V_S13%, and return to step S5；

S9. n platform main transformer capacitive reactive power compensation dosages Q are calculated_CiSum, as saturation loading region 110kV transformer stations hold Property reactive-load compensation amount, carry out capacitive reactive power compensation configuration.

Further, described step S5, takes into account annual capacitive reactive power compensation machine utilization, annual with previous year The highest burden with power of each moon is as foundation, specific as follows：I-th main transformer previous year annual each moon is obtained first most High burden with power P_ijAnd corresponding power factorSubscript j takes 1～12；Then the average of burden with power is calculated by formula (1) Value P_avi, the meansigma methodss of power factor are calculated by formula (2)

In formula (1), P_aviUnit be MW.

Further, described step S6, capacitive reactive power compensation dosage consider idle in-situ balancing, idle comprising sending under main transformer Amount and main transformer reactive loss, it is specific as follows：Judge number of windings m of i-th main transformer, if m is 2, Q is calculated by formula (3)_Ci, If m is 3, Q is calculated by formula (4)_Ci,

In formula (3) and formula (4), Q_CiUnit be Mvar, S_NUnit be MVA.

Described saturation loading region, refers to that the annual load level in the region has reached saturation and steady statue.

The present invention compared with prior art, has the advantage that and beneficial effect：

(1) The present invention gives specifically for the capacitive reactive power compensation capacity configuration of saturation loading region 110kV transformer stations Method, ensure electric network reactive-load in-situ balancing on the premise of, reasonably control the quantity of reactive power compensator, saved into This, be 110kV transformer stations Correlative plans content providers just, effective reference frame.

(2) planing method provided by the present invention, depending on being the actual loading level for different power supply areas, it is to avoid Carry out the blindness of 110kV transformer stations capacitive reactive power compensation capacity configuration.

Description of the drawings

Fig. 1 is the stream of saturation loading region 110kV transformer stations capacitive reactive power compensation capacity collocation method of the present invention Cheng Tu；

Calculating embodiment transformer station schematic diagrams of the Fig. 2 for Fig. 1 methods describeds.

Specific embodiment

With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited In this, if having below, it is that those skilled in the art can refer to prior art realization.

Certain 110kV transformer station is made up of the transformator that bench-types No. 3 are SFZ7-40000/110, its schematic diagram such as Fig. 2 institutes Show.

With reference to Fig. 1 planning processes, a kind of saturation loading region 110kV transformer stations capacitive reactive power compensation capacity collocation method, Comprise the following steps：

(1) the main transformer number n of 110kV transformer stations is obtained, i=1 is made：In the present embodiment, n=3；

(2) obtain number of windings m of i-th main transformer：In the present embodiment, m is equal to 2；

(3) m being judged whether equal to 2, being the model parameter for then gathering i-th main transformer, described model parameter includes Rated capacity S of main transformer_N, no-load current percent I₀% and short-circuit voltage percent V_S%：In the present embodiment, the 1st～3 The model parameter of platform main transformer all, as shown in table 1；

1 110kV main transformer parameters of table

(4) obtain highest burden with power average value P of i-th main transformer power supply area in annual each moon_aviWith power because Number meansigma methodssIt is specific as follows：

A, the highest burden with power P for obtaining i-th main transformer previous year annual each moon_ijAnd corresponding power factorSubscript j takes 1～12；

B, by formula (1) calculate burden with power average value P_avi, power factor is calculated by formula (2)

In the present embodiment, the highest burden with power and corresponding power factor, burden with power of 3 main transformers annual each moon Meansigma methodss and power factor meansigma methodss are as shown in table 2：

2 110kV transformer stations of table, 3 main transformer load datas

(5) calculate i-th main transformer capacitive reactive power compensation dosage Q_Ci, capacitive reactive power compensation dosage considers idle in-situ balancing, It is comprising idle amount and main transformer reactive loss are sent under main transformer, specific as follows：Judge number of windings m of i-th main transformer, if m is 2, Q is calculated by formula (3) then_CiIf m is 3, calculates Q by formula (4)_Ci,

In the present embodiment, the number of windings of 3 main transformers is 2, calculates the capacitive of every main transformer according to formula (3) Reactive compensation capacity, it is as follows：

(6) n platform main transformer capacitive reactive power compensation dosages Q are calculated_CiSum, as 110kV transformer stations capacitive reactive power compensation dosage： In the present embodiment, Q_C1+Q_C2+Q_C3=13+13+12=38Mvar, thus take 38Mvar as the 110kV transformer stations capacitive without Work(compensation dosage.

It can be seen that, matched somebody with somebody using a kind of saturation loading region 110kV transformer stations capacitive reactive power compensation capacity proposed by the invention Method is put, the idle planning of transformer station can be effectively instructed, is contributed to idle in-situ balancing, and is avoided reactive-load compensation equipment a large amount of It is idle.

Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention not by above-described embodiment Restriction, the modification made under other any spirit and principle without departing from the present invention, modification, replacement, combination, simplification, Equivalent substitute mode is should be, should be all included within protection scope of the present invention.

Claims (1)

1. saturation loading region 110kV transformer stations capacitive reactive power compensates collocation method, it is characterised in that comprise the steps of：

S1. the main transformer number n of 110kV transformer stations is obtained, i=1 is made；

S2. obtain number of windings m of i-th main transformer；

S3. m is judged whether equal to 2, be then execution step S4, otherwise execution step S8；

S4. the model parameter of i-th main transformer is gathered, described model parameter includes rated capacity S of main transformer_N, it is unloaded Electric current percent I₀% and short-circuit voltage percent V_S%；

S5. obtain average value P of i-th main transformer power supply area in the highest burden with power of annual each moon_aviAnd corresponding power The meansigma methodss cos φ of factor_avi；Annual capacitive reactive power compensation machine utilization is taken into account, with the highest of previous year annual each moon Burden with power is as foundation, specific as follows：The highest burden with power of i-th main transformer previous year annual each moon is obtained first P_ijAnd corresponding power factorSubscript j takes 1～12；Then the average value P of burden with power is calculated by formula (1)_avi, by formula (2) meansigma methodss of power factor are calculated

$P_{avi}=\frac{1}{12}\underset{j=1}{\overset{12}{\Σ}}{P}_{ij}---\left(1\right)$

In formula (1), P_aviUnit be MW；

S6. calculate i-th main transformer capacitive reactive power compensation dosage Q_Ci, capacitive reactive power compensation dosage considers idle in-situ balancing, comprising Idle amount and main transformer reactive loss two parts are sent under main transformer, it is specific as follows：Judge number of windings m of i-th main transformer, if m is 2, then Q is calculated by formula (3)_CiIf m is 3, calculates Q by formula (4)_Ci,

In formula (3) and formula (4), Q_CiUnit be Mvar, S_NUnit be MVA；

S7. i is judged whether equal to n, be then execution step S9, otherwise make i=i+1, and return to step S2；

S8. the model parameter of i-th main transformer is gathered, described model parameter includes rated capacity S of main transformer_N, it is unloaded Electric current percent I₀%, height-low short-circuit voltage percent V_S13%, and return to step S5；

S9. n platform main transformer capacitive reactive power compensation dosages Q are calculated_CiSum, as saturation loading region 110kV transformer stations capacitive without Work(compensation dosage, carries out capacitive reactive power compensation configuration.