CN102646984A - Method and system for realizing real-time automatic compensation of voltage and reactive power of substation - Google Patents
Method and system for realizing real-time automatic compensation of voltage and reactive power of substation Download PDFInfo
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Abstract
The invention discloses a method for realizing real-time automatic compensation of the voltage and reactive power of a substation, wherein the characteristics of various reactive compensation and voltage optimization methods are analyzed according to the grid reactive power equilibrium principle and the reactive compensation rule; and in combination with the actual situations of a smart grid and an operating team, new automatic compensation manner and policy superior to the traditional 9-cell dynamic reactive compensation algorithm are proposed; thereby a foundation is laid for the construction of the smart grid and the implementation of an operating team, heavy operation, regulation and control integrated production manner.
Description
Technical field
The present invention relates to a kind of method that realizes that transformer substation voltage and reactive power compensate in real time automatically, also relate to a kind of system simultaneously.
Background technology
Voltage is one of important indicator of the electrical network quality of power supply, and quality of voltage all has direct influence to the stabilization of power grids and power equipment safety operation, line loss, industrial or agricultural safety in production, product quality, electricity consumption unit consumption and people's lives electricity consumption.And in high voltage power transmission voltage and idle contacting directly, idle size is determining the height of voltage.And voltage and idle control are the optimization problems of a multiple target, multiple constraint in the transformer station; Can not lean on the method for parsing to describe fully; The approach that solves is to adopt the engineering practical algorithm to make control decision, and in this process, at first image data from the automated system of dispatching control center; And it is sent into the voltage analysis module and idle analysis module carries out analysis-by-synthesis; Form the regulating command of transforming plant main transformer tap, the instruction of substation capacitors switching, select opening-closing capacitor bank an inductive switch rupturing capacity and a deciliter number of times are met the demands, all operational orders are finally delivered to the dispatching control center control system and are carried out associative operation; Move in circles, the idle and voltage of automatic surveillance is also regulated.
According to above-mentioned control flow; Traditional regulative mode is that the division (dynamic 9 districts figure) of adopting the voltage power-less limit value interval is carried out; See shown in Figure 4; In each district, combination makes the 9th district that the operating point entering is idle, voltage all meets the demands with voltage power-less equipment with the control sequence of optimum, in line with the out-of-limit accent tap of voltage, idle out-of-limit switching capacitance according to this figure; Both all out-of-limit first switching capacitances, it is basic voltage power-less subregion control strategy that still defective principle of transferring tap is again controlled.Because this division is too simple, there is not to consider the comprehensive function effect of voltage power-less adjusting comprehensively, cause the reciprocating action phenomenon easily; In case this situation occurs; Circulation can only be walked according to flow chart shown in Figure 3 by system, and cut-off procedure automatically not is so must avoid.
9 field methods realize transforming plant voltage reactive control automatically according to basic principle, and this method comes with some shortcomings.Because this division is too simple, do not consider influencing each other between the voltage power-less adjusting.Like Fig. 4, if operating point at the some A in 8 districts, according to regulating principle, boost in the position that should lower category earlier.But, because the reactive power of A and the idle upper limit are more approaching, behind the position that lowers category; Because the coil turn of tap reduces, the idle minimizing that transformer consumes causes the idle increase of system; So after lowering category, voltage and idle all can increase to some extent, operating point very likely gets into 6 districts like this.After operating point gets into 6 districts, as do not have capacitor to cut, the position can only upgrade.Operating point possibly got back to again near the 8 district Central Plains operating point; Realize like this transformer substation voltage and reactive power in real time automatically the method for compensation will send repeatedly that the position that the lowers category → position that upgrades → lowering category, the position → position upgrades ... Operational order, make operating point ceaselessly between 8 districts and 6 districts the vibration.In addition, in 2,4,6 districts, exist similar operating point equally.Above this situation has increased the adjusting number of times of tap, and is very unfavorable for the safe operation of transformer.
Summary of the invention
In view of this; One of the object of the invention provides a kind of method that realizes that transformer substation voltage and reactive power compensate in real time automatically; This method can realize real-time pressure regulation, the reactive power compensation of transformer on-load voltage regulating through adopting the smeared out boundary algorithm, reduces number of operations; Avoid the deficiency of shifting gears repeatedly, guarantee the quality of voltage of system; Two of the object of the invention provides a kind of system that realizes that transformer substation voltage and reactive power compensate in real time automatically.
One of the object of the invention is realized by the following technical programs:
This kind realized the method that transformer substation voltage and reactive power compensate in real time automatically, may further comprise the steps:
Step 1: gather related data from dispatching control center;
Step 2: carry out voltage analysis and idle analysis;
Step 3: by aforementioned analysis result, confirm real-time zone of living in,, send the instruction of load tap changer regulating command and capacitor switching based on the adjusting strategy in each district;
Step 4: carry out by dispatching control center, compensate automatically, real-time status is adjusted to voltage and idle all qualified;
In step 2, said voltage analysis and idle analysis comprise that with voltage power-less limit value interval division be dynamic nine district figure, and each district is defined as follows:
1 district: the ultra lower limit of voltage, idle ultra lower limit;
2 districts: voltage is qualified, idle ultra lower limit;
3 districts: the ultra upper limit of voltage, idle ultra lower limit;
4 districts: the ultra upper limit of voltage is idle qualified;
5 districts: the ultra upper limit of voltage, the idle ultra upper limit;
6 districts: voltage is qualified, the idle ultra upper limit;
7 districts: the ultra lower limit of voltage, the idle ultra upper limit;
8 districts: the ultra lower limit of voltage is idle qualified;
9 districts: voltage, idle all qualified;
In step 3, each regional adjusting strategy is following:
Zone 9: idle all qualified with voltage, needn't regulate;
Zone 1: idle lower limit more, voltage is got over lower limit, throws the capacitor group; When the capacitor group all drops into, send out the instruction of boosting; When on load tap changer is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 2: idle lower limit more, voltage is qualified, throws the capacitor group;
Zone 3: idle lower limit more, voltage is got over the upper limit, sends out the step-down instruction; Modulated during when loaded switch to the lower position, send out and cut the instruction of capacitor group by force;
Zone 4: idle qualified, voltage is got over the upper limit, sends out the step-down instruction; When loaded switch is in the lower position, sends out and cut the instruction of capacitor group by force;
Zone 5: the idle upper limit more, voltage is got over the upper limit, sends out and cuts the instruction of capacitor group; When capacitor group complete resection, send out the step-down instruction;
Zone 6: the idle upper limit more, voltage is qualified, sends out and cuts the instruction of capacitor group;
Zone 7: the idle upper limit more, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 8: idle qualified, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing.
Further, the necessary and sufficient condition of said capacitor group input is following:
U
L+ΔU
L≤U≤U
H-ΔU
H；
Cos(f
1)＞TR；
Cos(f
2)＜QC；
I＞I
L；
Wherein, U
LBe under-voltage definite value, Δ U
LBe under-voltage return difference, U
HBe the overvoltage definite value, Δ U
HBe the overvoltage return difference, TR is for dropping into definite value, and QC is excision definite value, I
LBe the undercurrent definite value, U, I are actual voltage, electric current, Cos (f
1) be the preceding measured power factor of electric capacity input, Cos (f
2) be the calculated value of the power factor behind next group electric capacity of input under the current load condition.
Further, the transformer on-load voltage regulating device criterion of boosting is:
80v＜u＜u
L；
Max(I
1,I
2)＜I
d；
Corresponding step-down criterion is:
120v＞u＞u
H；
Max(I
1,I
2)＜I
d；
I
1, I
2Be respectively one, two main transformer running currents, I
dBe pressure regulation latching current definite value.
Two of the object of the invention is realized through following technical scheme:
This kind realized the system that transformer substation voltage and reactive power compensate in real time automatically, comprises
Data acquisition interface is used for the automated system image data from dispatching control center;
Voltage analysis module and idle analysis module are used for the data of gathering are analyzed, and real-time status is included into a certain district in dynamic nine districts, according to the control strategy in this district, form the regulating command of transforming plant main transformer tap, the instruction of substation capacitors switching;
The instruction output interface is used for instruction is delivered to the dispatching control center control system and carried out associative operation;
Above-mentioned each module moves in circles, and the idle and voltage of automatic monitor system is also regulated;
Each regional adjusting strategy is following:
Zone 9: idle all qualified with voltage, needn't regulate;
Zone 1: idle lower limit more, voltage is got over lower limit, throws the capacitor group; When the capacitor group all drops into, send out the instruction of boosting; When on load tap changer is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 2: idle lower limit more, voltage is qualified, throws the capacitor group;
Zone 3: idle lower limit more, voltage is got over the upper limit, sends out the step-down instruction; Modulated during when loaded switch to the lower position, send out and cut the instruction of capacitor group by force;
Zone 4: idle qualified, voltage is got over the upper limit, sends out the step-down instruction; When loaded switch is in the lower position, sends out and cut the instruction of capacitor group by force;
Zone 5: the idle upper limit more, voltage is got over the upper limit, sends out and cuts the instruction of capacitor group; When capacitor group complete resection, send out the step-down instruction;
Zone 6: the idle upper limit more, voltage is qualified, sends out and cuts the instruction of capacitor group;
Zone 7: the idle upper limit more, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 8: idle qualified, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing.
The invention has the beneficial effects as follows:
The present invention is through adopting the smeared out boundary algorithm; Can realize real-time pressure regulation, the reactive power compensation of transformer on-load voltage regulating, can effectively reduce corresponding number of operations, avoid the deficiency of shifting gears repeatedly; The voltage of surveillance that can intelligence and idle can guarantee the quality of voltage of system; Provided under the smeared out boundary algorithm regulative mode and the theoretical foundation of various adjusting criterions in each zone simultaneously, proposed the malfunction monitoring means of capacitor and discharge coil thereof, laid a good foundation for further realizing transformer station's unattended operation and electrical network intellectuality.
Other advantages of the present invention, target and characteristic will be set forth in specification subsequently to a certain extent; And to a certain extent; Based on being conspicuous to those skilled in the art, perhaps can from practice of the present invention, obtain instruction to investigating of hereinafter.Target of the present invention and other advantages can realize and obtain through following specification and claims.
Description of drawings
In order to make the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is made further detailed description below, wherein:
Fig. 1 is system's reactive power voltage character of load curve chart;
Fig. 2 is system's reactive power equilibrium curve chart;
Fig. 3 is the real-time control chart of reactive voltage;
Fig. 4 is voltage power-less interval division figure;
Fig. 5 is voltage power-less smeared out boundary figure.
Embodiment
Below will carry out detailed description to the preferred embodiments of the present invention with reference to accompanying drawing.Should be appreciated that preferred embodiment has been merely explanation the present invention, rather than in order to limit protection scope of the present invention.
The related notion summary:
1. reactive power compensation principle: the voltage of electric power system and system are idle to have close ties; Idle balance direct relation the stability of voltage, and the condition of system's reactive balance is that the reactive power that the reactive power source in the system can send should be more than or equal to load and the required reactive power sum of electrical network.The equilibrium relation of power system reactive power power is suc as formula shown in (1):
Q
h＝Q
gc-Q
f-Q
s （1）
Q wherein
GcBe the reactive power sum that power supply sends, reactive power source mainly refers to generator and various reactive power compensator; Q
fBe the load or burden without work sum; Q
sBe the reactive loss sum in the network; Q
hBe the available subsequent use reactive power of system.
The principle of reactive power compensation is Q
h>0 o'clock, reactive power can balance and have certain subsequent use in the system; Work as Q
h<0 o'clock, reactive power was not enough in the system, and at this moment, the power supply quality for the working voltage that guarantees system adds reactive power compensator with regard to considered.
2. the balance principle when reactive power is not enough: whether system's reactive power equilibrium is the prerequisite of system voltage quality good or not, and reactive power plays crucial effect aspect electric energy transmitting.Fig. 1 is the quiescent voltage performance diagram of system's reactive power load, and under the normal condition, the reactive power that system's reactive power power supply is provided is Qgcn, and at this moment, corresponding voltage is rated voltage Un, the Q in the formula (1)
hBe zero, this voltage is corresponding to the voltage levvl of the normal operation of system.The reactive power Q gc that provides when system's reactive power power supply is during less than Qgcn; System is in order to search out new balance point, and voltage can reduce accordingly, in this case; Though can take some measure; As the no-load voltage ratio that changes certain transformer improves the voltage levvl in some areas, but the reactive power of whole system is still not enough, and the quality of voltage of system can not get comprehensive improvement.The balance that this system reactive power reaches when not enough is that the voltage-regulation effect that the reactive power load itself has descends system-wide reactive power demand to some extent and reaches because the voltage levvl of system descends.
3. the balance principle when reactive power is sufficient: when system voltage is rated voltage; As shown in Figure 2; The relation of system's reactive power source reactive power Q and voltage U is a curve 1; The reactive power Q and the relation between the voltage U of load are curve 2, and both intersection point a have confirmed the rated voltage Ua of load bus.
When load increases, shown in curve 2, if the reactive power source of system does not have corresponding increase; The idle characteristic of power supply remains curve 1, at this moment curve 1 and curve 2 ' intersection point a ＇ be exactly new reactive power equilibrium point, and determined that thus the voltage of load point is Ua '; Obviously Ua ' Ua, and the load increase be described after, system's reactive power power supply can not satisfy the reactive balance under voltage U a; Can only reduce the voltage operation, to obtain the reactive power equilibrium under the low voltage; If but system's reactive power source is relatively sufficient, through compensation, the idle characteristic of system power supply will on move on to curve 1 ' the position, thereby make curve 1 ' with 2 ' the determined load bus voltage of intersection point c reach or approaching original numerical value Ua.Above-mentioned visible, through can effectively guarantee the quality of voltage of system to the control of system's reactive power source.
4. reactive power compensation principle: country's " power system voltage and var technology guide rule " regulation, reactive power compensation should be followed following principle with voltage-regulation and carry out: a. population equilibrium combines with local equilibrium; B. electric power compensation combines with user's compensation; C. dispersion compensation combines with centralized compensation; D. falling damage and combine with pressure regulation, is main to fall damage.In addition, reactive power compensation should try one's best layering (by electric pressure) and subregion (by the area) compensation, in-situ balancing is avoided the long-distance conveying of var and the transmission of bypassing the immediate leadership.
Based on above-mentioned notion, to the deficiency of traditional nine field methods, the method that realization transformer substation voltage of the present invention and reactive power compensate in real time automatically may further comprise the steps:
Step 1: gather related data from dispatching control center;
Step 2: carry out voltage analysis and idle analysis;
Step 3: by aforementioned analysis result; Confirm real-time zone of living in,, send the instruction of load tap changer regulating command and capacitor switching according to the adjusting strategy in each district; System identification capacitor group will surpass 5 minutes break time when throwing the capacitor group, prevents that residual charge from causing overvoltage;
Step 4: carry out by dispatching control center, compensate automatically, real-time status is adjusted to voltage and idle all qualified;
In step 2, said voltage analysis and idle analysis comprise that with voltage power-less limit value interval division be dynamic nine district figure, and each district is defined as follows:
1 district: the ultra lower limit of voltage, idle ultra lower limit;
2 districts: voltage is qualified, idle ultra lower limit;
3 districts: the ultra upper limit of voltage, idle ultra lower limit;
4 districts: the ultra upper limit of voltage is idle qualified;
5 districts: the ultra upper limit of voltage, the idle ultra upper limit;
6 districts: voltage is qualified, the idle ultra upper limit;
7 districts: the ultra lower limit of voltage, the idle ultra upper limit;
8 districts: the ultra lower limit of voltage is idle qualified;
9 districts: voltage, idle all qualified;
Further; Consider the influence of idle adjusting to voltage; Voltage status is introduced idle adjusting criterion, and to guarantee the rapport of idle adjusting and voltage-regulation, making idle adjusting border is influence by voltage and the smeared out boundary of serving voltage-regulation to a certain extent.According to this thought, set up the switching criterion that following Mathematical Modeling is used as the capacitor group:
In the formula: U
0Normal voltage for Circuit Fault on Secondary Transformer; Q
0Capacity for every group capacitor group; U is the voltage instantaneous value of secondary side; The on high-tension side power instantaneous value of Q is the same with abscissa among Fig. 4;
β is a weight coefficient, can ask for through boundary condition.Q in formula (2), (3)
Throw, Q
CutValue be corresponding executive condition more than or equal to 1.
Its Principles of Regulation are as shown in Figure 5; The upper and lower limit of voltage is a steady state value; But all variations of linearity of idle upper and lower limit along with the variation of voltage, when system's no-power vacancy was big, idle lower bound was along with voltage raises and linear increase; No-power vacancy is less or when negative, the higher limit on idle border increases along with the decline of voltage.The meaning of coordinate and Fig. 4's is identical among Fig. 5, and abscissa Q is the idle input of transformer high-voltage side, and idle bound is to the capacitor group.According to controlling principle: reasonably regulate on-load transformer tap changer and switched capacitor, systems attempt is run in the zone 9, each regional control law is following:
Zone 9: idle all qualified with voltage, needn't regulate;
Zone 1: idle lower limit more, voltage is got over lower limit, throws the capacitor group; When the capacitor group all drops into, send out the instruction of boosting; When on load tap changer is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 2: idle lower limit more, voltage is qualified, throws the capacitor group;
Zone 3: idle lower limit more, voltage is got over the upper limit, sends out the step-down instruction; Modulated during when loaded switch to the lower position, send out and cut the instruction of capacitor group by force;
Zone 4: idle qualified, voltage is got over the upper limit, sends out the step-down instruction; When loaded switch is in the lower position, sends out and cut the instruction of capacitor group by force;
Zone 5: the idle upper limit more, voltage is got over the upper limit, sends out and cuts the instruction of capacitor group; When capacitor group complete resection, send out the step-down instruction;
Zone 6: the idle upper limit more, voltage is qualified, sends out and cuts the instruction of capacitor group;
Zone 7: the idle upper limit more, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 8: idle qualified, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing.
In above-mentioned control strategy, consider that the switching of capacitor is relevant with composite factors such as voltage, electric current, reactive power, power factors, the necessary and sufficient condition of its input is following:
U
L+ΔU
L≤U≤U
H-ΔU
H （4）
Cos(f
1)＞TR （5）
Cos(f
2)＜QC （6）
I＞I
L （7）
Wherein, U
LBe under-voltage definite value, Δ U
LBe under-voltage return difference, U
HBe the overvoltage definite value, Δ U
HBe the overvoltage return difference, TR is for dropping into definite value, and QC is excision definite value, I
LBe the undercurrent definite value, U, I are actual voltage, electric current, Cos (f
1) be the preceding measured power factor of electric capacity input, Cos (f
2) be the calculated value of the power factor behind next group electric capacity of input under the current load condition.
The criterion that the substation transformer Loading voltage regulator boosts is suc as formula shown in (8), (9), and corresponding step-down criterion is suc as formula shown in (10), (11), and I1, I2 are respectively one, two main transformer running currents, and Id is a pressure regulation latching current definite value.
80v＜u＜u
L （8）
Max(I
1,I
2)＜I
d （9）
120v＞u＞u
H （10）
Max(I
1,I
2)＜I
d （11）
Based on the thought of said method, the invention allows for a kind of system that realizes that transformer substation voltage and reactive power compensate in real time automatically, comprise
Data acquisition interface is used for the automated system image data from dispatching control center;
Voltage analysis module and idle analysis module are used for the data of gathering are analyzed, and real-time status is included into a certain district in dynamic nine districts, according to the control strategy in this district, form the regulating command of transforming plant main transformer tap, the instruction of substation capacitors switching;
The instruction output interface is used for instruction is delivered to the dispatching control center control system and carried out associative operation;
Above-mentioned each module moves in circles, and the idle and voltage of automatic monitor system is also regulated;
Each regional adjusting strategy is following:
Zone 9: idle all qualified with voltage, needn't regulate;
Zone 1: idle lower limit more, voltage is got over lower limit, throws the capacitor group; When the capacitor group all drops into, send out the instruction of boosting; When on load tap changer is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 2: idle lower limit more, voltage is qualified, throws the capacitor group;
Zone 3: idle lower limit more, voltage is got over the upper limit, sends out the step-down instruction; Modulated during when loaded switch to the lower position, send out and cut the instruction of capacitor group by force;
Zone 4: idle qualified, voltage is got over the upper limit, sends out the step-down instruction; When loaded switch is in the lower position, sends out and cut the instruction of capacitor group by force;
Zone 5: the idle upper limit more, voltage is got over the upper limit, sends out and cuts the instruction of capacitor group; When capacitor group complete resection, send out the step-down instruction;
Zone 6: the idle upper limit more, voltage is qualified, sends out and cuts the instruction of capacitor group;
Zone 7: the idle upper limit more, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 8: idle qualified, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing.
The present invention is through adopting the smeared out boundary algorithm; Can realize real-time pressure regulation, the reactive power compensation of transformer on-load voltage regulating, can effectively reduce corresponding number of operations, avoid the deficiency of shifting gears repeatedly; The voltage of surveillance that can intelligence and idle can guarantee the quality of voltage of system; Provided under the smeared out boundary algorithm regulative mode and the theoretical foundation of various adjusting criterions in each zone simultaneously, proposed the malfunction monitoring means of capacitor and discharge coil thereof, laid a good foundation for further realizing transformer station's unattended operation and electrical network intellectuality.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of present technique scheme, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (4)
1. realize the method that transformer substation voltage and reactive power compensate in real time automatically, it is characterized in that: said method comprising the steps of:
Step 1: gather related data from dispatching control center;
Step 2: carry out voltage analysis and idle analysis;
Step 3: by aforementioned analysis result, confirm real-time zone of living in,, send the instruction of load tap changer regulating command and capacitor switching based on the adjusting strategy in each district;
Step 4: carry out by dispatching control center, compensate automatically, real-time status is adjusted to voltage and idle all qualified;
In step 2, said voltage analysis and idle analysis comprise that with voltage power-less limit value interval division be dynamic nine district figure, and each district is defined as follows:
1 district: the ultra lower limit of voltage, idle ultra lower limit;
2 districts: voltage is qualified, idle ultra lower limit;
3 districts: the ultra upper limit of voltage, idle ultra lower limit;
4 districts: the ultra upper limit of voltage is idle qualified;
5 districts: the ultra upper limit of voltage, the idle ultra upper limit;
6 districts: voltage is qualified, the idle ultra upper limit;
7 districts: the ultra lower limit of voltage, the idle ultra upper limit;
8 districts: the ultra lower limit of voltage is idle qualified;
9 districts: voltage, idle all qualified;
In step 3, according to the smeared out boundary algorithm, it is following to set each regional adjusting strategy:
Zone 9: idle all qualified with voltage, needn't regulate;
Zone 1: idle lower limit more, voltage is got over lower limit, throws the capacitor group; When the capacitor group all drops into, send out the instruction of boosting; When on load tap changer is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 2: idle lower limit more, voltage is qualified, throws the capacitor group;
Zone 3: idle lower limit more, voltage is got over the upper limit, sends out the step-down instruction; Modulated during when loaded switch to the lower position, send out and cut the instruction of capacitor group by force;
Zone 4: idle qualified, voltage is got over the upper limit, sends out the step-down instruction; When loaded switch is in the lower position, sends out and cut the instruction of capacitor group by force;
Zone 5: the idle upper limit more, voltage is got over the upper limit, sends out and cuts the instruction of capacitor group; When capacitor group complete resection, send out the step-down instruction;
Zone 6: the idle upper limit more, voltage is qualified, sends out and cuts the instruction of capacitor group;
Zone 7: the idle upper limit more, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 8: idle qualified, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing.
2. the method that realization transformer substation voltage as claimed in claim 1 and reactive power compensate in real time automatically is characterized in that: the necessary and sufficient condition that said capacitor group drops into is following:
U
L+ΔU
L≤U≤U
H-ΔU
H；
Cos(f
1)＞TR；
Cos(f
2)＜QC；
I＞I
L；
Wherein, U
LBe under-voltage definite value, Δ U
LBe under-voltage return difference, U
HBe the overvoltage definite value, Δ U
HBe the overvoltage return difference, TR is for dropping into definite value, and QC is excision definite value, I
LBe the undercurrent definite value, U, I are actual voltage, electric current, Cos (f
1) be the preceding measured power factor of electric capacity input, Cos (f
2) be the calculated value of the power factor behind next group electric capacity of input under the current load condition.
3. the method that realization transformer substation voltage as claimed in claim 1 and reactive power compensate in real time automatically, it is characterized in that: the criterion that the transformer on-load voltage regulating device boosts is:
80v＜u＜u
L；
Max(I
1,I
2)＜I
d；
Corresponding step-down criterion is:
120v＞u＞u
H；
Max(I
1,I
2)＜I
d；
I
1, I
2Be respectively one, two main transformer running currents, I
dBe pressure regulation latching current definite value.
4. realize the system that transformer substation voltage and reactive power compensate in real time automatically, it is characterized in that: said system comprises data acquisition interface, is used for the automated system image data from dispatching control center;
Voltage analysis module and idle analysis module are used for the data of gathering are analyzed, and real-time status is included into a certain district in dynamic nine districts, according to the control strategy in this district, form the regulating command of transforming plant main transformer tap, the instruction of substation capacitors switching;
The instruction output interface is used for instruction is delivered to the dispatching control center control system and carried out associative operation;
Above-mentioned each module moves in circles, and the idle and voltage of automatic monitor system is also regulated;
Each regional adjusting strategy is following:
Zone 9: idle all qualified with voltage, needn't regulate;
Zone 1: idle lower limit more, voltage is got over lower limit, throws the capacitor group; When the capacitor group all drops into, send out the instruction of boosting; When on load tap changer is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 2: idle lower limit more, voltage is qualified, throws the capacitor group;
Zone 3: idle lower limit more, voltage is got over the upper limit, sends out the step-down instruction; Modulated during when loaded switch to the lower position, send out and cut the instruction of capacitor group by force;
Zone 4: idle qualified, voltage is got over the upper limit, sends out the step-down instruction; When loaded switch is in the lower position, sends out and cut the instruction of capacitor group by force;
Zone 5: the idle upper limit more, voltage is got over the upper limit, sends out and cuts the instruction of capacitor group; When capacitor group complete resection, send out the step-down instruction;
Zone 6: the idle upper limit more, voltage is qualified, sends out and cuts the instruction of capacitor group;
Zone 7: the idle upper limit more, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing;
Zone 8: idle qualified, voltage is got over lower limit, sends out the instruction of boosting; When loaded switch is in upper limit position, send out the strong capacitor group instruction of throwing.
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| CN113822580A (en) * | 2021-09-24 | 2021-12-21 | 华润电力技术研究院有限公司 | Equipment working condition evaluation method and related equipment |
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