CN113922385B - Bridge difference current adjustment strategy for capacitor bank balance bridge - Google Patents
Bridge difference current adjustment strategy for capacitor bank balance bridge Download PDFInfo
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- CN113922385B CN113922385B CN202111319785.5A CN202111319785A CN113922385B CN 113922385 B CN113922385 B CN 113922385B CN 202111319785 A CN202111319785 A CN 202111319785A CN 113922385 B CN113922385 B CN 113922385B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention discloses a bridge difference current adjustment strategy for a balance bridge of a capacitor bank, which is based on the combination of an arrangement and combination idea and the capacitor bank, and aims at the situation of unbalanced current caused by the regulation of capacitance load in the capacitor bank, so that a method for selecting an optimal scheme is formed.
Description
Technical Field
The invention belongs to the technical field of capacitor operation and maintenance, and particularly relates to a bridge difference current adjustment strategy for a capacitor bank balance bridge.
Background
The capacitor bank has wide application in a power system, and the parallel capacitor bank can balance reactive power in the system, adjust voltage level and improve power factor of the system. However, since the capacitor bank device works under high electric field intensity for a long time and is often influenced by switching overvoltage and inrush current, the capacitor bank device is one of devices with higher failure rate in a power system. An unbalanced protection, which is the main protection of the capacitor bank, may shut off the capacitor to protect the stable operation of the power system when the capacitor bank fails.
When the bridge difference current of the capacitor bank is larger than the setting value of the unbalanced protection current, the unbalanced protection can act, so that the system is protected to stably run. However, in actual operation, each capacitor cannot be made to meet a specified value in the capacitor manufacturing process, but the rate of change of each capacitor is still within a qualified range. Therefore, under a certain combination, the bridge arm capacitance tolerance of the capacitor bank is overlarge, the bridge is not balanced, and the unbalanced protection is performed. It is common practice for such malfunctions to adjust the unbalance protection current setting value so that the bridge differential current does not interfere with the unbalance protection. This method can solve the problem of unbalanced protection malfunction in a short time. However, since the arm withstand voltage of a part of the capacitor becomes high, the degradation of the part of the capacitor is accelerated. Also, discarding the repurchase is not a choice of consideration since this part of the capacitance does not exceed a certain range of ratings. Therefore, the existing capacitors are rearranged and combined, so that the capacitance tolerance of the bridge arms of the combined capacitor bank is reduced, the bridge difference current is smaller than the unbalanced protection current setting value or reduced to zero, the protection is not operated, and the method is more feasible and accords with the economic practice.
Disclosure of Invention
The invention aims to provide a bridge difference current adjustment strategy for a capacitor bank balance bridge, which reduces the false tripping times of unbalanced protection of a capacitor bank and reduces the operation and maintenance difficulty of the capacitor bank.
The technical scheme adopted by the invention is that a bridge difference current adjustment strategy for a capacitor bank balance bridge is implemented by connecting a current transformer in the middle of the balance bridge, and the method specifically comprises the following steps:
step 1, establishing a relation model between bridge difference current and capacitor bank capacitance and applying the relation model between capacitor bank voltages;
step 2, measuring capacitance values of all capacitors in the capacitor bank, and connecting the capacitors in parallel to obtain a plurality of groups of equivalent capacitors; dividing the capacitance values of the equivalent capacitors into two groups according to the capacitance values of the equivalent capacitors, respectively selecting one capacitor in the two groups to be connected in series, and finally forming a 4-order matrix;
step 3, bringing the numerical values in the 4-order matrix into the relation model obtained in the step 1 to obtain bridge difference current, and returning to the step 2 to recombine the parallel capacitors;
and 4, selecting the optimal bridge difference current, and taking a capacitance combination mode corresponding to the optimal bridge difference current as a capacitance combination mode in the final capacitor bank.
The invention is also characterized in that:
the specific process of the step 1 is as follows:
the bridge arm connection in the capacitor bank is as follows: the bridge arm 1 and the bridge arm 2 are connected with the total current input end, the bridge arm 3 and the bridge arm 4 are connected with the total current output end, the bridge arm 1 is connected with the bridge arm 3, the bridge arm 2 is connected with the bridge arm 4, one end of a current transformer is connected between the bridge arm 1 and the bridge arm 3, and the other end of the current transformer is connected between the bridge arm 2 and the bridge arm 4;
the capacitances of four bridge arms in the capacitor bank are respectively taken as the capacitances of bridge arm 1: c (C) 1 、C 2 、C 3 、C 4 The bridge arm 2 capacitance is: c (C) 5 、C 6 、C 7 、C 8 The bridge arm 3 capacitances are respectively: c (C) 9 、C 10 、C 11 、C 12 The capacitance of the bridge arm 4 is respectively as follows: c (C) 13 、C 14 、C 15 、C 16 ；
The four capacitances of each bridge arm are equivalent to one capacitance, expressed as:
C 11 the equivalent capacitance of the bridge arm 1 is C 12 The equivalent capacitance of the bridge arm 2 is C 21 The equivalent capacitance of the bridge arm 3 is C 22 The equivalent capacitance of the bridge arm 4;
the total current I flowing through the capacitor bank is expressed as:
wherein U is the voltage applied to the capacitor bank, ω is the angular frequency of the capacitor bank;
total current I of bridge arm 1 1 The method comprises the following steps:
total current I of bridge arm 3 3 The method comprises the following steps:
the capacitor bank bridge difference current Δi is:
in the step 2, the specific process of connecting the capacitors in parallel is as follows: each capacitor in the capacitor bank is arranged in ascending order according to the capacitance value, eight capacitors with larger capacitance values are respectively connected with one of eight capacitors with smaller capacitance values in parallel randomly, and eight groups of equivalent capacitors are obtained, which are specifically expressed as:
C 8,i ＝C 16,i +C 16,17-i i＝1,2,...,8 (6)
wherein C is 8,i Is equivalent to 8 capacitance values, C 16,i The first 8 capacitance values of the ascending order of 16 capacitance are C 16,17-i The 8 capacitance values after the 16 capacitance ascending sequence are ordered.
The specific process of forming the 4-order matrix in the step 2 is as follows: the equivalent capacitors are ordered according to the capacitance values, capacitors with larger capacitance values are selected to form a group, capacitors with smaller capacitance values form a second group, and the capacitors in the first group are randomly connected in series with the capacitors in the second group to form a 4-order matrix.
The specific process of the step 4 is as follows:
setting an unbalanced protection playing current threshold, selecting a bridge difference current which is not larger than the unbalanced protection playing current threshold in the bridge difference current obtained in the step 3, taking the minimum bridge difference current value as the optimal bridge difference current, and taking a capacitance connection mode corresponding to the optimal bridge difference current as a capacitance combination mode in a final capacitor bank.
The beneficial effects of the invention are as follows:
the invention discloses a bridge difference current adjustment strategy for a capacitor bank balance bridge, which mainly aims at solving the problem that other healthy capacitors are damaged due to three-phase large unbalanced current caused by unbalanced capacitor capacitance values. The capacitors are orderly arranged, so that bridge difference current is reduced, and the purpose of reducing three-phase unbalanced current is achieved.
Drawings
FIG. 1 is a flow chart of a strategy for regulating the differential bridge current of a balance bridge for a capacitor bank according to the present invention;
FIG. 2 is an equivalent diagram of the invention where 16 capacitances are equivalent to 8 capacitances;
FIG. 3 is an equivalent diagram of the invention, wherein 8 capacitors are equivalent to 4 capacitors;
fig. 4 is a schematic diagram of an optimal implementation of the combined capacitor in situ in accordance with the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and detailed description.
The invention relates to a bridge difference current adjustment strategy for a balance bridge of a capacitor bank, wherein a current transformer is connected in the middle of the balance bridge when the balance bridge is used, and a new combination scheme is obtained by measuring the existing capacitance value and rearranging the sequence of the capacitance value so as to reduce the bridge difference current. The method comprises the steps of discussing the relationship between the bridge difference current and the capacitance of a capacitor bank and the voltage applied to the capacitor bank, then selecting a proper scheme set by a program with the aim of reducing the unbalance level of the capacitance, and reducing the bridge difference current by a balanced capacitance mode; screening the scheme with the minimum bridge difference current from all schemes meeting the expectation as an optimal scheme; according to the optimal scheme, the economy of the capacitor is improved greatly compared with that of the capacitor to be replaced, and the capacitor is implemented according to the following steps, as shown in fig. 1:
step 1, connecting bridge arms in a capacitor bank as follows: the bridge arm 1 and the bridge arm 2 are connected with the total current input end, the bridge arm 3 and the bridge arm 4 are connected with the total current output end, the bridge arm 1 is connected with the bridge arm 3, the bridge arm 2 is connected with the bridge arm 4, one end of a current transformer is connected between the bridge arm 1 and the bridge arm 3, and the other end of the current transformer is connected between the bridge arm 2 and the bridge arm 4;
the capacitances of four bridge arms in the capacitor bank are respectively taken as the capacitances of bridge arm 1: c (C) 1 、C 2 、C 3 、C 4 The bridge arm 2 capacitance is: c (C) 5 、C 6 、C 7 、C 8 The bridge arm 3 capacitances are respectively: c (C) 9 、C 10 、C 11 、C 12 The capacitance of the bridge arm 4 is respectively as follows: c (C) 13 、C 14 、C 15 、C 16 ；
The four capacitances of each bridge arm are equivalent to one capacitance, expressed as:
C 11 the equivalent capacitance of the bridge arm 1 is C 12 The equivalent capacitance of the bridge arm 2 is C 21 The equivalent capacitance of the bridge arm 3 is C 22 The equivalent capacitance of the bridge arm 4;
the total current I flowing through the capacitor bank is expressed as:
wherein U is the voltage applied to the capacitor bank, ω is the angular frequency of the capacitor bank;
total current I of bridge arm 1 1 The method comprises the following steps:
total current I of bridge arm 3 3 The method comprises the following steps:
the capacitor bank bridge difference current Δi is:
equation (5) is a model of the relationship between bridge differential current and capacitor bank capacitance and the applied capacitor bank voltage.
Step 2, measuring capacitance values of all capacitors in the capacitor bank, wherein the specific process of connecting the capacitors in parallel is as follows: each capacitor in the capacitor bank is arranged in ascending order according to the capacitance value, eight capacitors with larger capacitance values are respectively connected with one of eight capacitors with smaller capacitance values in parallel randomly, and eight groups of equivalent capacitors are obtained, which are specifically expressed as:
C 8,i ＝C 16,i +C 16,17-i i＝1,2,...,8 (6)
wherein C is 8,i Is equivalent to 8 capacitance values, C 16,i The first 8 capacitance values of the ascending order of 16 capacitance are C 16,17-i The 8 capacitance values after the 16 capacitance ascending sequence are ordered.
The equivalent capacitors are ordered according to the capacitance values, capacitors with larger capacitance values are selected to form a group, capacitors with smaller capacitance values form a second group, the capacitors in the first group are respectively connected in series with the capacitors in the second group in sequence to form a 4-order matrix, and the 4-order matrix is expressed as follows by a formula:
wherein C is 1st,i For the capacitive row directionCorresponding element of quantity group C 2nd,i Is the element corresponding to the capacitor column vector group.
Take 2C 1st,i 、C 2nd,i The capacitive elements in the vector group are serially combined to form a 4-order square matrix:
C 4 (i, j) is the generated 4 th order matrix.
Step 3, bringing the numerical values in the 4-order matrix into the relation model obtained in the step 1, namely a formula (5), obtaining bridge difference current, and returning to the step 2 to recombine the parallel capacitors;
step 4, setting an unbalance protection to play a role of a current threshold I st And (3) selecting the bridge difference current which is not more than the unbalance protection current threshold value in the bridge difference current obtained in the step (3), namely satisfying the formula (9), taking the minimum bridge difference current value as the optimal bridge difference current, namely satisfying the formula (10), and taking the capacitance connection mode corresponding to the optimal bridge difference current as the capacitance combination mode in the final capacitor bank.
ΔI≤I st (9)
min(ΔI(i)) i＝1,2… (10)。
Examples
Since the unbalanced current is larger after the 66kV two groups of capacitors of a power substation in northeast China are subjected to fault treatment, the original differential current protection fixed value of 0.1A does not meet the requirement (the tripping fixed values of 2 times are respectively 0.115A and 0.116A), and the actual measurement shows that 16 capacitors meet the regulation, and the specific capacitors are shown in the table 1.
TABLE 1
First, after 16 capacitors are arranged, the capacitor bank is subjected to a first process for eliminating the capacitance imbalance level. Equivalent 8 capacitors were obtained, as shown in fig. 2 and table 2.
TABLE 2
The equivalent 8 capacitors are arranged, and two groups are equally distributed. The two groups of capacitors are mutually combined to further reduce the unbalance level of the capacitors to obtain a 4-order square matrix, and the two groups of capacitors are respectively C 1st,i 、C 2st,j The 4-order square matrix is shown in fig. 3 and table 3.
TABLE 3 Table 3
| C 1st,1 | C 1st,2 | C 1st,3 | C 1st,4 | |
| C 2st,1 | 13.0246 | 13.0246 | 13.0246 | 13.0246 |
| C 2st,2 | 13.0246 | 13.0246 | 13.0246 | 13.0246 |
| C 2st,3 | 13.0246 | 13.0246 | 13.0246 | 13.0246 |
| C 2st,4 | 13.0246 | 13.0246 | 13.0246 | 13.0246 |
And (3) selecting the optimal bridge difference current by bringing the capacitance value in the 4-order matrix into the relation model obtained in the step (1).
And further screening the coincidence scheme, and selecting an optimal scheme with the minimum bridge difference current as a target, wherein the optimal scheme is shown in fig. 4 and table 4.
TABLE 4 Table 4
Through calculation, the bridge difference current of the arrangement combination is 0A, the bridge difference current of the original combination is 0.9630A, and the bridge difference current can be obviously reduced by the combination after arrangement, so that the arrangement combination is an ideal result. The original 16 capacitance data were analyzed, with the original data exhibiting significant symmetry, 12 for 13.1 μF and 4 for 12.8 μF. Four capacitors of 12.8 mu F are evenly distributed to each bridge arm, the bridge capacitors are balanced, the bridge difference current is 0A, and the bridge difference current is consistent with the result obtained by the method provided by the invention, so that the rationality of the result is shown.
Through the mode, the bridge difference current adjustment strategy for the capacitor bank balance bridge is oriented to the unbalanced current condition caused by the regulation of the capacitance load in the capacitor bank, and a method for selecting the optimal scheme is formed based on the combination of the arrangement and combination thought and the capacitor bank.
Claims (4)
1. The bridge difference current adjustment strategy for the capacitor bank balance bridge is characterized in that a current transformer is connected in the middle of the balance bridge, and the bridge difference current adjustment strategy is implemented according to the following steps:
step 1, establishing a relation model between bridge difference current and capacitor bank capacitance and applying the relation model between capacitor bank voltages;
step 2, measuring capacitance values of all capacitors in the capacitor bank, and connecting the capacitors in parallel to obtain a plurality of groups of equivalent capacitors; dividing the capacitance values of the equivalent capacitors into two groups according to the capacitance values of the equivalent capacitors, respectively selecting one capacitor in the two groups to be connected in series, and finally forming a 4-order matrix;
step 3, bringing the numerical values in the 4-order matrix into the relation model obtained in the step 1 to obtain bridge difference current, and returning to the step 2 to recombine the parallel capacitors;
step 4, selecting the optimal bridge difference current, and taking a capacitance combination mode corresponding to the optimal bridge difference current as a capacitance combination mode in a final capacitor bank;
the specific process of the step 1 is as follows:
the bridge arm connection in the capacitor bank is as follows: the bridge arm 1 and the bridge arm 2 are connected with the total current input end, the bridge arm 3 and the bridge arm 4 are connected with the total current output end, the bridge arm 1 is connected with the bridge arm 3, the bridge arm 2 is connected with the bridge arm 4, one end of a current transformer is connected between the bridge arm 1 and the bridge arm 3, and the other end of the current transformer is connected between the bridge arm 2 and the bridge arm 4;
the capacitances of four bridge arms in the capacitor bank are respectively taken as the capacitances of bridge arm 1: c (C) 1 、C 2 、C 3 、C 4 The bridge arm 2 capacitance is: c (C) 5 、C 6 、C 7 、C 8 The bridge arm 3 capacitances are respectively: c (C) 9 、C 10 、C 11 、C 12 The capacitance of the bridge arm 4 is respectively as follows: c (C) 13 、C 14 、C 15 、C 16 ；
The four capacitances of each bridge arm are equivalent to one capacitance, expressed as:
C 11 the equivalent capacitance of the bridge arm 1 is C 12 The equivalent capacitance of the bridge arm 2 is C 21 The equivalent capacitance of the bridge arm 3 is C 22 The equivalent capacitance of the bridge arm 4;
the total current I flowing through the capacitor bank is expressed as:
wherein U is the voltage applied to the capacitor bank, ω is the angular frequency of the capacitor bank;
total current I of bridge arm 1 1 The method comprises the following steps:
total current I of bridge arm 3 3 The method comprises the following steps:
the capacitor bank bridge difference current Δi is:
2. the bridge difference current adjustment strategy for a balance bridge of a capacitor bank according to claim 1, wherein in the step 2, the specific process of connecting capacitors in parallel is as follows: each capacitor in the capacitor bank is arranged in ascending order according to the capacitance value, eight capacitors with larger capacitance values are respectively connected with one of eight capacitors with smaller capacitance values in parallel randomly, and eight groups of equivalent capacitors are obtained, which are specifically expressed as:
C 8,i ＝C 16,i +C 16,17-i i＝1,2,...,8(6)
wherein C is 8,i Is equivalent to 8 capacitance values, C 16,i The first 8 capacitance values of the ascending order of 16 capacitance are C 16,17-i The 8 capacitance values after the 16 capacitance ascending sequence are ordered.
3. The bridge differential current adjustment strategy for a capacitor bank balancing bridge according to claim 1, wherein the specific process of forming the 4-order matrix in step 2 is: the equivalent capacitors are ordered according to the capacitance values, capacitors with larger capacitance values are selected to form a group, capacitors with smaller capacitance values form a second group, and the capacitors in the first group are respectively and sequentially connected in series with the capacitors in the second group to form a 4-order matrix.
4. The bridge differential current regulation strategy for a capacitor bank balancing bridge of claim 1, wherein step 4 comprises the specific steps of:
setting an unbalanced protection playing current threshold, selecting a bridge difference current which is not larger than the unbalanced protection playing current threshold in the bridge difference current obtained in the step 3, taking the minimum bridge difference current value as the optimal bridge difference current, and taking a capacitance connection mode corresponding to the optimal bridge difference current as a capacitance combination mode in a final capacitor bank.
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2021
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| CN102231326A (en) * | 2011-04-08 | 2011-11-02 | 中电普瑞科技有限公司 | 3/2-type differential current bridge power capacitor apparatus |
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| CN108988368A (en) * | 2018-08-07 | 2018-12-11 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of Π type wiring capacitance device group degree of unbalancedness leveling method |
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