CN105186527B - 220kV transformer stations cluster reactive compensation capacity collocation method - Google Patents

Abstract

The invention discloses 220kV transformer stations cluster reactive compensation capacity collocation method, target complex is bundled into including choosing the f 220kV transformer station connected by 220kV circuits, it is determined that boundary group, target line, boundary circuit and separation, gather main transformer and circuit model parameter；Secondly, prediction is big and small mode under, sent under target complex main transformer active, power factor, under send it is idle flow to the factor, target line transmission is active, and boundary line transmission is active, power factor at separation, transmit and idle flow to the factor；Again, calculate under big and small mode, total load or burden without work of target complex, boundary circuit flow into the idle of target complex from separation；Finally, the appearance inductive reactive power compensation total capacity of target complex is calculated, is configured according to power transformation capacity principle of equipartition.The method of the present invention, it is adaptable to the reactive-load compensation planning of 220kV transformer stations, is conducive to reactive layered subregion to balance nearby and avoids the blindness of idle configuration.

Description

220kV transformer stations cluster reactive compensation capacity collocation method

Technical field

The present invention relates to the reactive-load compensation planning of transformer station, the more particularly to capacitive of 220kV transformer stations and inductive reactive power is mended Repay capacity collocation method.

Background technology

South China grid voltage quality and the requirement of var administrative standard, 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 reactive power compensation of 220kV transformer stations is to compensate based on main transformer reactive loss, and adequate compensation partial line The reactive loss on road.Compensation capacity is configured according to the 10%~30% of main transformer capacity, and it is maximum to meet 220kV main transformers During load, its high-pressure side power factor is not less than 0.95.

Reactive-load compensation is configured according to the principle has simple and convenient, workable advantage, but the principle does not have Reactive balance demand according to different reactive voltage characteristic power networks makes more optimal configuration, causes some transformer stations to compensate Degree, and the not enough problem of some transformer stations compensation.

The content of the invention

It is an object of the invention to provide 220kV transformer stations cluster reactive compensation capacity collocation method, the method is favourable Balanced nearby in reactive layered subregion and avoid the blindness of idle configuration.

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

220kV transformer stations cluster reactive compensation capacity collocation method, it is characterised in that the method comprises the following steps：

S1. choose the f 220kV transformer station connected by 220kV circuits and be bundled into target complex, pass through with target complex 500kV transformer stations, 220kV power plant and the 220kV transformer stations that 220kV circuits are connected are used as boundary group；Play the 220kV of connection Circuit connects boundary group with the circuit of target complex as boundary circuit as target line in target line, set every boundary The separation of circuit is end points of the circuit in this side of boundary group；

S2. obtain the number of units a of target complex 220kV main transformers, main transformer be numbered from 1 to a, make i=1~a, and i just Initial value is 1；The quantity b of target line is obtained, target line is numbered from 1 to b, make the j=1~b, and the initial value of j be 1；The quantity c of boundary circuit is obtained, boundary circuit is numbered from 1 to c, make k=1~c, and the initial value of k is 1；

S3. the model parameter of i-th main transformer of collection target complex, including main transformer capacity S_Ni, no-load current percentage I_0i%, high-pressure side short-circuit impedance voltage percentage V_S1i%, medium voltage side short-circuit impedance voltage percentage V_S2i%, low-pressure side short circuit resistance Reactance voltage percentage V_S3i%；Under predicting big mode and small mode, i-th main transformer medium voltage side of target complex under 110kV power networks to sending Active P_CziAnd P_Lzi, power factorWithUnder send and idle flow to factor lambda_CziAnd λ_Lzi, i-th master of target complex Low pressure side under 10kV or 20kV power networks to sending active P_CdiAnd P_Ldi, power factorWithUnder send idle stream To factor lambda_CdiAnd λ_Ldi；

S4. judge whether i is equal to a, if i is not equal to a, make i=i+1, and return to step S3；If i is equal to a, step is performed Rapid S5；

S5. the model parameter of j-th strip target line, including line length L are gathered_j, circuit unit milimeter number reactance value X_jWith Circuit unit milimeter number susceptance value B_j；Under predicting big mode and small mode, the active P of j-th strip target line transmission_CxjAnd P_Lxj；

S6. judge whether j is equal to b, if j is not equal to b, make j=j+1, and return to step S5；If j is equal to b, step is performed Rapid S7；

S7. under predicting big mode and small mode, kth bar is demarcated the active P of line transmission_CfkAnd P_Lfk, at separation Power factorWithTransmission is idle to flow to factor lambda_CfkAnd λ_Lfk；

S8. judge whether k is equal to c, if k is not equal to c, make k=k+1, and return to step S7；If k is equal to c, step is performed Rapid S9；

S9. calculate under big mode and small mode, total load or burden without work Q of target complex_CsumAnd Q_Lsum；Calculate big mode and small side Under formula, boundary circuit flows into the reactive power Q of target complex from separation_CfAnd Q_Lf；

S10. the capacitive reactive power of target complex compensates total capacity Q_CCalculated by formula (1), inductive reactive power compensation total capacity Q_LBy formula (2) calculate,

And configured according to power transformation capacity principle of equipartition.

Described step S4 and S8, the idle factor that flows to is comprising sending the idle factor and the boundary circuit of flowing under target complex Transmission is idle to flow to the class of the factor two, specific as follows：

A. when sending idle direction to flow to lower floor's power network by target complex under target complex, under send the idle factor that flows to take 1；Work as target Group under send idle direction to flow to target complex by lower floor's power network, under send the idle factor that flows to take -1；

B. when boundary circuit flows to target complex in the idle direction of transmission of separation by the group that demarcates, transmission is idle to flow to the factor Take 1；Transmitted the idle factor that flows to and taken -1 by target complex flow direction boundary group in the idle direction of transmission of separation when boundary circuit.

Described lower floor's power network, for 220kV main transformer medium voltage sides, lower floor's power network refers to 110kV power networks；For For 220kV main transformer low-pressure sides, lower floor's power network refers to 10kV or 20kV power networks.

Described step S10, total load or burden without work of target complex includes target complex to reactive power, the mesh sent under lower floor's power network The line charging power of the main transformer reactive loss, the circuit reactive loss of target line and target line of group is marked, it is specific as follows：Greatly Total load or burden without work Q under mode_CsumCalculated by formula (3), the total load or burden without work Q under small mode_LsumCalculated by formula (4),

In formula,It refer to target under big mode Group is to the reactive power sent under lower floor's power network；

It refer to target under big mode The main transformer reactive loss of group；It refer to the reactive loss of target line under big mode； Refer to the line charging power of target line under big mode.

In formula,It refer to mesh under small mode

Mark group is to the reactive power sent under lower floor's power network；

It refer to target under small mode The main transformer reactive loss of group；It refer to the reactive loss of target line under small mode；It is Refer to the line charging power of target line under small mode.

Described step S11, boundary circuit flows into the reactive power of target complex from separation, specific as follows：Under big mode Q_CfCalculated by formula (5), the Q under small mode_LfCalculated by formula (6),

Described step S12, is configured according to power transformation capacity principle of equipartition, specific as follows：I-th main transformer of target complex Capacitive reactive power compensation capacity Q_CiCalculated by formula (7), inductive reactive power compensation capacity Q_LiCalculated by formula (8),

The present invention starts with from the idle angle of balance nearby, and grid structure and active prediction based on different power networks propose one Cover practicable reactive compensation capacity collocation method.

Compared with prior art, the present invention has following remarkable result：

(1) The present invention gives specific 220kV transformer stations cluster reactive compensation capacity collocation method, from it is idle nearby Balance is started with, and to the more close 220kV transformer stations binding of electrical connection in groups, carries out integrated planning, so can be reasonably Control the quantity of reactive power compensator, saved cost, be 220kV transformer stations Correlative plans content providers just, effectively Reference frame.

(2) planing method provided by the present invention, is directed to depending on different grid structures and actual loading level, it is to avoid Carry out the blindness of 220kV reactive compensation capacity of substation configurations.

Brief description of the drawings

The present invention is described in further detail with reference to the accompanying drawings and detailed description.

Fig. 1 is the flow chart of 220kV transformer stations cluster reactive compensation capacity collocation method of the present invention；

Fig. 2 is that the calculating embodiment rack of 220kV transformer stations cluster reactive compensation capacity collocation method of the present invention is illustrated Figure.

Specific embodiment

As shown in figure 1, the 220kV transformer stations cluster reactive compensation capacity collocation method, comprises the following steps：

(1) choose the f 220kV transformer station connected by 220kV circuits and be bundled into target complex, pass through with target complex 500kV transformer stations, 220kV power plant and the 220kV transformer stations that 220kV circuits are connected are used as boundary group：In the present embodiment, f=3, Target complex is A, B and C transformer station of Fig. 2, and boundary group is 500kV transformer stations O stations, 220kV power plant Y stations and the 220kV power transformations of Fig. 2 The W that stands stands；

Play the 220kV circuits of connection as target line, the circuit of boundary group and target complex is connected in target line Used as boundary circuit, the separation for setting every boundary circuit is circuit in the end points of this side of group of demarcating：In the present embodiment, mesh The l of graticule road Fig. 2₁、l₂、l₃、l₄、l₅、l₆And l₇, boundary circuit is the l of Fig. 2₄、l₅、l₆And l₇；

(2) obtain the number of units a of target complex 220kV main transformers, main transformer be numbered from 1 to a, make i=1~a, and i just Initial value is 1：In the present embodiment, a=6, wherein A, B and C transformer station respectively have 2 main transformers, are numbered successively；

The quantity b of target line is obtained, target line is numbered from 1 to b, make the j=1~b, and the initial value of j be 1：In the present embodiment, b=7；

The quantity c of boundary circuit is obtained, boundary circuit is numbered from 1 to c, make the k=1~c, and the initial value of k be 1：In the present embodiment, c=4；

(3) the model parameter of i-th main transformer of collection target complex, including main transformer capacity S_Ni, no-load current percentage I_0i%, high-pressure side short-circuit impedance voltage percentage V_S1i%, medium voltage side short-circuit impedance voltage percentage V_S2i%, low-pressure side short circuit resistance Reactance voltage percentage V_S3i%：In the present embodiment, the model parameter of the 1st~6 main transformer is as shown in table 1；

Table 1：Target complex main transformer model parameter

i
						1	240	0.04	15.6	-1.24	22.7
2	240	0.04	15.6	-1.24	22.7
						3	180	0.16	16.4	-1.62	38.1
4	180	0.16	16.4	-1.62	38.1
						5	150	0.17	14.5	-0.80	9.1
6	150	0.17	14.5	-0.80	9.1

Under predicting big mode and small mode, i-th main transformer medium voltage side of target complex under lower floor's power network to sending active P_CziWith P_Lzi, power factorWithUnder send and idle flow to factor lambda_CziAnd λ_Lzi, i-th main transformer low-pressure side of target complex To sending active P under lower floor's power network_CdiAnd P_Ldi, power factorWithUnder send and idle flow to factor lambda_CdiAnd λ_Ldi： In the present embodiment, the 1st~6 predicted value of the main transformer under big mode and small mode is as shown in table 2 and table 3；

Table 2：The big mode main transformer predicted value of target complex

Table 3：Target group of mean people's mode main transformer predicted value

(4) the model parameter of j-th strip target line, including line length L are gathered_j, circuit unit milimeter number reactance value X_jWith Circuit unit milimeter number susceptance value B_j, in the present embodiment, the model parameter of the 1st~7 article of target line is as shown in table 4；

Table 4：Target line model parameter

i
				1	4	0.305	3.68
2	10	0.305	3.68
				3	10	0.305	3.68
4	6	0.305	3.68
				5	6	0.305	3.68
6	6	0.305	3.68
				7	15	0.305	3.68

Under predicting big mode and small mode, the active P of j-th strip target line transmission_CxjAnd P_Lxj：In the present embodiment, the 1st~ The predicted value of 7 target lines under big mode and small mode is as shown in table 5；

Table 5：Target line predicted value

i
			1	20	6
2	170	27
			3	170	27
4	300	66
			5	250	40
6	250	40
			7	100	20

(5) under the big mode of prediction and small mode, the active P of kth bar boundary line transmission_CfkAnd P_Lfk, at separation Power factorWithTransmission is idle to flow to factor lambda_CfkAnd λ_Lfk：In the present embodiment, the 1st~4 article of line of demarcation Predicted value under Lu great modes and small mode is as shown in table 6；

Table 6：Boundary circuit predicted value

(6) calculate under big mode and small mode, total load or burden without work Q of target complex_CsumAnd Q_Lsum, target complex it is total idle negative Pocket containing target complex to the reactive power, the main transformer reactive loss of target complex sent under lower floor's power network, the circuit of target line is idle Loss and the line charging power of target line, the total load or burden without work Q under big mode_CsumCalculated by formula (3), it is total under small mode Load or burden without work Q_LsumCalculated by formula (4)：In the present embodiment, Q_Csum=174Mvar, Q_Lsum=10Mvar；

Calculate under big mode and small mode, boundary circuit flows into the reactive power Q of target complex from separation_CfAnd Q_Lf, it is generous Q under formula_CfCalculated by formula (5), the Q under small mode_LfCalculated by formula (6)：In the present embodiment, Q_Cf=142Mvar, Q_Lf=﹣ 24Mvar。

(7) the capacitive reactive power compensation total capacity Q of target complex_CCalculated by formula (1), inductive reactive power compensation total capacity Q_LBy formula (2) Calculate：In the present embodiment, Q_C=32Mvar, Q_L=0Mvar, i.e. target complex only need to capacitive reactive power compensation to be configured, it is not necessary to match somebody with somebody Put inductive reactive power compensation；

And configured according to power transformation capacity principle of equipartition, i-th capacitive reactive power compensation capacity Q of main transformer_CiCounted by formula (7) Calculate, inductive reactive power compensation capacity Q_LiCalculated by formula (8)：In the present embodiment, the capacitive reactive power compensation capacity of every main transformer of A transformer stations Q_C1=Q_C2The capacitive reactive power compensation capacity Q of every main transformer of=7Mvar, B transformer station_C3=Q_C4Every main transformer of=5Mvar, C transformer station Capacitive reactive power compensation capacity Q_C5=Q_C6=4Mvar.

It can be seen that, using 220kV transformer stations cluster reactive compensation capacity collocation method proposed by the invention, can be effectively Instruct the idle planning of transformer station, contribute to it is idle balance nearby, and simultaneous avoid reactive-load compensation equipment from largely leaving unused.

The above embodiment of the present invention is not limiting the scope of the present invention, and embodiments of the present invention are not limited to This, all this kind the above of the invention, according to the ordinary technical knowledge and customary means of this area, is not departing from this Under the premise of inventing above-mentioned basic fundamental thought, the modification of other diversified forms made to said structure of the present invention, replace or become More, all should fall within the scope and spirit of the invention.

Claims (5)

1.220kV transformer stations cluster reactive compensation capacity collocation method, it is characterised in that the method comprises the following steps：

S1. choose the f 220kV transformer station connected by 220kV circuits and be bundled into target complex, 220kV lines are passed through with target complex 500kV transformer stations, 220kV power plant and the 220kV transformer stations that road connects are used as boundary group；The 220kV circuits for playing connection are made It is target line, boundary group is connected in target line with the circuit of target complex as boundary circuit, every boundary circuit of setting Separation is end points of the circuit in this side of boundary group；

S2. obtain the number of units a of target complex 220kV main transformers, main transformer be numbered from 1 to a, make i=1~a, and i initial value It is 1；The quantity b of target line is obtained, target line is numbered from 1 to b, make j=1~b, and the initial value of j is 1；Obtain The quantity c of boundary circuit is taken, boundary circuit is numbered from 1 to c, make k=1~c, and the initial value of k is 1；

S3. the model parameter of i-th main transformer of collection target complex, including main transformer capacity S_Ni, no-load current percentage I_0i%, high pressure Side short-circuit impedance voltage percentage V_S1i%, medium voltage side short-circuit impedance voltage percentage V_S2i%, low-pressure side short-circuit impedance voltage hundred Fraction V_S3i%；Under predicting big mode and small mode, i-th main transformer medium voltage side of target complex under lower floor's power network to sending active P_CziWith P_Lzi, power factorWithUnder send and idle flow to factor lambda_CziAnd λ_Lzi, i-th main transformer low-pressure side of target complex To sending active P under lower floor's power network_CdiAnd P_Ldi, power factorWithUnder send and idle flow to factor lambda_CdiAnd λ_Ldi；

S4. judge whether i is equal to a, if i is not equal to a, make i=i+1, and return to step S3；If i is equal to a, step S5 is performed；

S5. the model parameter of j-th strip target line, including line length L are gathered_j, circuit unit milimeter number reactance value X_jAnd circuit Unit milimeter number susceptance value B_j；Under predicting big mode and small mode, the active P of j-th strip target line transmission_CxjAnd P_Lxj；

S6. judge whether j is equal to b, if j is not equal to b, make j=j+1, and return to step S5；If j is equal to b, step S7 is performed；

S7. under predicting big mode and small mode, kth bar is demarcated the active P of line transmission_CfkAnd P_Lfk, power at separation FactorWithTransmission is idle to flow to factor lambda_CfkAnd λ_Lfk；

S8. judge whether k is equal to c, if k is not equal to c, make k=k+1, and return to step S7；If k is equal to c, step S9 is performed；

S9. calculate under big mode and small mode, total load or burden without work Q of target complex_CsumAnd Q_Lsum；

Calculate under big mode and small mode, boundary circuit flows into the reactive power Q of target complex from separation_CfAnd Q_Lf；

S10. the capacitive reactive power of target complex compensates total capacity Q_CCalculated by formula (1), inductive reactive power compensation total capacity Q_LCounted by formula (2) Calculate,

$Q_C=\left\{\begin{array}{cc}0& (Q_{Csum}\≤Q_{Cf})\\ Q_{Csum}-Q_{Cf}& (Q_{Csum}>Q_{Cf})\end{array}\right.---\left(1\right)$

$Q_L=\left\{\begin{array}{cc}0& (Q_{Lsum}\&GreaterEqual;Q_{Lf})\\ Q_{Lf}-Q_{Lsum}& (Q_{Lsum}<Q_{Lf})\end{array}\right.---\left(2\right);$

And configured according to power transformation capacity principle of equipartition.

2. 220kV transformer stations cluster reactive compensation capacity collocation method according to claim 1, it is characterised in that：Institute State send under the target complex in step S3 it is idle flow to the factor, it is specific as follows：

A. when sending idle direction to flow to lower floor's power network by target complex under target complex, under send the idle factor that flows to take 1；When under target complex Send idle direction to flow to target complex by lower floor's power network, under send the idle factor that flows to take -1；

The transmission of the boundary circuit in the step S7 is idle to flow to the factor, specific as follows：

B. when boundary circuit flows to target complex in the idle direction of transmission of separation by the group that demarcates, transmit the idle factor that flows to and take 1； Transmitted the idle factor that flows to and taken -1 by target complex flow direction boundary group in the idle direction of transmission of separation when boundary circuit.

3. 220kV transformer stations cluster reactive compensation capacity collocation method according to claim 1, it is characterised in that：Institute The step of stating S10, total load or burden without work of target complex includes target complex to the reactive power sent under lower floor's power network, the main transformer of target complex The line charging power of reactive loss, the circuit reactive loss of target line and target line, it is specific as follows：It is total under big mode Load or burden without work Q_CsumCalculated by formula (3), the total load or burden without work Q under small mode_LsumCalculated by formula (4),

4. the 220kV transformer stations cluster reactive compensation capacity collocation method according to any one of claims 1 to 3, it is special Levy and be：The method also includes step S11, and boundary circuit flows into the reactive power of target complex from separation, specific as follows：It is generous Q under formula_CfCalculated by formula (5), the Q under small mode_LfCalculated by formula (6),

5. 220kV transformer stations cluster reactive compensation capacity collocation method according to claim 4, it is characterised in that：Should Method also includes step S12, is configured according to power transformation capacity principle of equipartition, specific as follows：I-th appearance of main transformer of target complex Property reactive compensation capacity Q_CiCalculated by formula (7), inductive reactive power compensation capacity Q_LiCalculated by formula (8),

$Q_{Ci}=\frac{S_{Ni}{Q}_C}{\underset{i=1}{\overset{a}{\&Sigma;}}{S}_{Ni}}---\left(7\right)$

$Q_{Li}=\frac{S_{Ni}{Q}_L}{\underset{i=1}{\overset{a}{\&Sigma;}}{S}_{Ni}}---\left(8\right).$