CN104779625A - 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 station capacitive reactive power compensates collocation method

Technical field

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

Background technology

South China grid voltage quality and the requirement of var administrative standard, the idle configuration of electric power system should be able to ensure under system burden with power peak and load valley operational mode, the reactive balance of layering and zoning.The capacitive reactive power of 110kV transformer station compensates based on compensator transformer reactive loss, and suitably takes into account the reactive power compensation of load side, and capacitive reactive power compensates 10% ~ 30% configuration that main transformer capacity is pressed in configuration.

Configure reactive power compensation according to this principle and there is simple and convenient, workable advantage, but this principle does not make more optimal configuration according to the reactive balance demand of different reactive voltage characteristic electrical network, cause some transformer station's overcompensate, and the problem of some transformer station's undercompensation.Therefore, the present invention starts with from idle in-situ balancing angle, and the capacitive reactive power for the power supply level research differentiation of different electrical network compensates.

In addition, some capacitive reactive power compensation capacity collocation method, be the reactive requirement configure according to the maximum extreme operational mode of satisfied annual load, this method may cause the utilance of annual capacitor equipment low.Therefore, the present invention is the utilization power taking into account capacitive reactive power compensation equipment, considers the load level in annual each month.

Summary of the invention

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

Object of the present invention is realized by following technical scheme:

A kind of saturation loading region 110kV transformer station capacitive reactive power compensation capacity collocation method, is characterized in that, comprise the step of following order:

S1. obtain the main transformer number n of 110kV transformer station, make i=1;

S2. the number of windings m of i-th main transformer is obtained;

S3. judge whether m equals 2, is, performs step S4, otherwise perform step S8;

S4. gather the model parameter of i-th main transformer, described model parameter comprises the rated capacity S of main transformer _n, no-load current percentage I ₀% and short-circuit voltage percentage V _s%;

S5. the average value P of i-th main transformer power supply area in the highest burden with power of the whole year each moon is obtained _aviwith the mean value of corresponding power factor

S6. i-th main transformer capacitive reactive power compensation rate Q is calculated _ci;

S7. judge whether i equals n, is, performs step S9, otherwise make i=i+1, and return step S2;

S8. gather the model parameter of i-th main transformer, described model parameter comprises the rated capacity S of main transformer _n, no-load current percentage I ₀%, height-low short-circuit voltage percentage V _s13%, and return step S5;

S9. n platform main transformer capacitive reactive power compensation rate Q is calculated _ciand, as saturation loading region 110kV transformer station capacitive reactive power compensation rate, carry out capacitive reactive power compensate configuration.

Further, described step S5, takes into account annual capacitive reactive power compensation equipment utilization power, using the highest burden with power of previous year annual each moon as foundation, specific as follows: the highest burden with power P first obtaining i-th main transformer previous year annual each moon _ijand corresponding power factor subscript j gets 1 ~ 12; Then the average value P of burden with power is calculated by formula (1) _avi, by the mean value of formula (2) rated output factor

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

In formula (1), P _aviunit be MW.

Further, described step S6, capacitive reactive power compensation rate considers idle in-situ balancing, send idle amount and main transformer reactive loss under comprising main transformer, specific as follows: the number of windings m judging i-th main transformer, if m is 2, then calculates Q by formula (3) _ciif m is 3, then calculate Q 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 this region has reached capacity and stable state.

Compared with prior art, tool has the following advantages and beneficial effect in the present invention:

(1) The present invention gives concrete for saturation loading region 110kV transformer station capacitive reactive power compensation capacity collocation method, under the prerequisite ensureing electric network reactive-load in-situ balancing, reasonably control the quantity of reactive power compensator, saved cost, for 110kV transformer station Correlative plan content providers just, effective reference frame.

(2) planing method provided by the present invention, is actual loading level for different power supply area and determines, and avoids the blindness of carrying out the capacitive reactive power compensation capacity configuration of 110kV transformer station.

Accompanying drawing explanation

Fig. 1 is the flow chart of saturation loading region 110kV transformer station of the present invention capacitive reactive power compensation capacity collocation method;

The calculating embodiment transformer station schematic diagram that Fig. 2 is method described in Fig. 1.

Embodiment

Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto, and do not describe part in detail especially if having below, are all that those skilled in the art can refer to existing techniques in realizing.

The transformer that certain 110kV transformer station is SFZ7-40000/110 by 3 bench-types number forms, and its schematic diagram as shown in Figure 2.

Composition graphs 1 planning process, a kind of saturation loading region 110kV transformer station capacitive reactive power compensation capacity collocation method, comprises the following steps:

(1) obtain the main transformer number n of 110kV transformer station, make i=1: in the present embodiment, n=3;

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

(3) judge whether m equals 2, is, gather the model parameter of i-th main transformer, described model parameter comprises the rated capacity S of main transformer _n, no-load current percentage I ₀% and short-circuit voltage percentage V _s%: in the present embodiment, the model parameter of 1st ~ 3 main transformers is all the same, as shown in table 1;

Table 1 110kV main transformer parameter

(4) the highest burden with power average value P of i-th main transformer power supply area in the whole year each moon is obtained _aviwith power factor mean value specific as follows:

A, the highest burden with power P of acquisition i-th main transformer previous year annual each moon _ijand corresponding power factor subscript j gets 1 ~ 12;

B, calculate burden with power average value P by formula (1) _avi, by formula (2) rated output factor

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

In the present embodiment, the highest burden with power and corresponding power factor, burden with power mean value and the power factor mean value of 3 main transformer annual each moons are as shown in table 2:

Table 2 110kV transformer station 3 main transformer load datas

(5) i-th main transformer capacitive reactive power compensation rate Q is calculated _ci, capacitive reactive power compensation rate considers idle in-situ balancing, send idle amount and main transformer reactive loss under comprising main transformer, specific as follows: the number of windings m judging i-th main transformer, if m is 2, then calculates Q by formula (3) _ciif m is 3, then calculate Q by formula (4) _ci,

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

$Q_{C1}=\sqrt{{\left(\frac{23}{0.91}\right)}^2-{23}^2}+0.26\×\frac{40}{100}+\frac{10.5}{100\×40}\×{\left(\frac{23}{0.91}\right)}^2=13\mathrm{Mvar}$

$Q_{C2}=\sqrt{{\left(\frac{22}{0.89}\right)}^2-{22}^2}+0.26\×\frac{40}{100}+\frac{10.5}{100\×40}\×{\left(\frac{22}{0.89}\right)}^2=13\mathrm{Mvar}$

$Q_{C3}=\sqrt{{\left(\frac{22}{0.90}\right)}^2-{22}^2}+0.26\×\frac{40}{100}+\frac{10.5}{100\×40}\×{\left(\frac{22}{0.90}\right)}^2=12\mathrm{Mvar}$

(6) n platform main transformer capacitive reactive power compensation rate Q is calculated _ciand, as 110kV transformer station capacitive reactive power compensation rate: in the present embodiment, Q _c1+ Q _c2+ Q _c3=13+13+12=38Mvar, therefore gets 38Mvar as this 110kV transformer station capacitive reactive power compensation rate.

Visible, adopt a kind of saturation loading region 110kV transformer station capacitive reactive power compensation capacity collocation method proposed by the invention, effectively can instruct the idle planning of transformer station, contribute to idle in-situ balancing, and avoid reactive-load compensation equipment to leave unused in a large number.

Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; other are any do not deviate from Spirit Essence of the present invention and principle under do amendment, modification, substitute, combination, to simplify; all should be the substitute mode of equivalence, all should be included within protection scope of the present invention.

Claims (3)

1. saturation loading region 110kV transformer station capacitive reactive power compensates collocation method, it is characterized in that, comprises following steps:

S1. obtain the main transformer number n of 110kV transformer station, make i=1;

S2. the number of windings m of i-th main transformer is obtained;

S3. judge whether m equals 2, is, performs step S4, otherwise perform step S8;

S4. gather the model parameter of i-th main transformer, described model parameter comprises the rated capacity S of main transformer _n, no-load current percentage I ₀% and short-circuit voltage percentage V _s%;

S5. the average value P of i-th main transformer power supply area in the highest burden with power of the whole year each moon is obtained _aviwith the mean value of corresponding power factor

S6. i-th main transformer capacitive reactive power compensation rate Q is calculated _ci;

S7. judge whether i equals n, is, performs step S9, otherwise make i=i+1, and return step S2;

S8. gather the model parameter of i-th main transformer, described model parameter comprises the rated capacity S of main transformer _n, no-load current percentage I ₀%, height-low short-circuit voltage percentage V _s13%, and return step S5;

S9. n platform main transformer capacitive reactive power compensation rate Q is calculated _ciand, as saturation loading region 110kV transformer station capacitive reactive power compensation rate, carry out capacitive reactive power compensate configuration.

2. saturation loading region 110kV transformer station according to claim 1 capacitive reactive power compensates collocation method, it is characterized in that, described step S5, take into account annual capacitive reactive power compensation equipment utilization power, using the highest burden with power of previous year annual each moon as foundation, specific as follows: the highest burden with power P first obtaining i-th main transformer previous year annual each moon _ijand corresponding power factor subscript j gets 1 ~ 12; Then the average value P of burden with power is calculated by formula (1) _avi, by the mean value of formula (2) rated output factor

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

In formula (1), P _aviunit be MW.

3. saturation loading region 110kV transformer station according to claim 1 capacitive reactive power compensates collocation method, it is characterized in that, described step S6, capacitive reactive power compensation rate considers idle in-situ balancing, idle amount and main transformer reactive loss two parts are sent under comprising main transformer, specific as follows: the number of windings m judging i-th main transformer, if m is 2, then calculate Q by formula (3) _ciif m is 3, then calculate Q by formula (4) _ci,

In formula (3) and formula (4), Q _ciunit be Mvar, S _nunit be MVA.