CN209786800U - 124888-coding-based full-common compensation device - Google Patents
124888-coding-based full-common compensation device Download PDFInfo
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- CN209786800U CN209786800U CN201920305225.6U CN201920305225U CN209786800U CN 209786800 U CN209786800 U CN 209786800U CN 201920305225 U CN201920305225 U CN 201920305225U CN 209786800 U CN209786800 U CN 209786800U
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- 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
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- 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
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Abstract
The utility model discloses a compensation arrangement altogether based on 124888 codes, include: the system comprises a three-phase line acquisition device, six compensation loops and a controller; the three-phase line acquisition device is arranged on the three-phase line and is used for detecting each phase voltage and current in the three-phase line; the six compensation circuits are arranged on the three-phase line in parallel, the six compensation circuits are respectively and electrically connected with the output end of the controller, and the output end of the three-phase line acquisition device is connected with the controller; the six compensation loops all adopt a common compensation capacitor loop, wherein the six compensation loops adopt an 124888 coding mode to distribute the capacity of the common compensation capacitor loop, and the controller combines seventeen domains to carry out switching operation on the six compensation loops. The utility model discloses a reactive power is leading, and the control mode of voltage for assisting realizes multistage quick switching, improves the compensation precision to reduce capacitor bank return circuit switching number of times under the prerequisite of guaranteeing the compensation effect.
Description
Technical Field
The utility model relates to an electric power system equipment technical field, concretely relates to compensation arrangement altogether based on 124888 codes is applicable to the regional reactive power compensation product design of low voltage electric network.
Background
with the rapid development of Chinese economy, the market demand of reactive compensation devices is also rapidly increasing. At present, most of the reactive compensation devices in the projects under construction and built are practically applied by adopting a traditional constant-volume compensation mode.
The traditional compensation scheme only has one coding mode, namely, the capacity of a single-loop capacitor is equal, and the capacitor is circularly switched, so that the capacitive reactive power provided by the traditional reactive power compensation device is limited in several grades, the compensation precision is not favorably improved, and the numerical value of the capacitive reactive power required to be compensated by a power grid is continuous and not graded.
In order to solve the above problems, we need to improve the capacitor circuit capacity matching and the capacitor circuit switching control strategy in the reactive power compensation device.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in to the not enough among the above-mentioned prior art, provides a compensation arrangement altogether based on 124888 codes.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
A full common compensation device based on 124888 codes, comprising: the system comprises a three-phase line acquisition device, six compensation loops and a controller;
The three-phase line acquisition device is arranged on the three-phase line and is used for detecting each phase voltage and current in the three-phase line; the six compensation circuits are arranged on the three-phase line in parallel, the six compensation circuits are respectively and electrically connected with the output end of the controller, and the output end of the three-phase line acquisition device is connected with the controller; the six compensation loops all adopt a common compensation capacitor loop, wherein the six compensation loops adopt an 124888 coding mode to distribute the capacity of the common compensation capacitor loop, and the controller combines seventeen domains to carry out switching operation on the six compensation loops.
As a further technical solution of the present invention is: the corresponding capacity ratio of the 124888 coding mode is 1:2:4:8:8:8, and the continuous adjustment of 31-gear capacity is realized by different combinations of six-circuit co-compensation capacitor circuits.
As a further technical solution of the present invention is: the seventeen domains are formed by dividing reactive power values and voltage values, wherein the voltage values comprise an undervoltage protection limit value, a voltage lower limit value, a voltage upper limit value and an overvoltage protection limit value; the reactive power value comprises a reactive power lower limit value and a reactive power upper limit value; and combining the maximum adjustment voltage value of the capacitor group corresponding to the maximum value of the reactive influence quantity of the input capacitor group and the maximum adjustment reactive power value of the capacity of the capacitor group corresponding to the maximum value of the reactive influence quantity of the input capacitor group, and dividing the input capacitor group into seventeen domains.
As a further technical solution of the present invention is: the common compensation capacitor loop comprises a capacitor bank loop with a capacitor delta connection method, a switching element and a control switch, wherein the output end of the capacitor bank loop is connected with the switching element, and the output end of the switching element is connected with a three-phase line through the control switch.
Furthermore, the control switch adopts a compound switch.
furthermore, the switching element adopts a dynamic compensation regulator.
The utility model has the advantages that:
The device adopts six common compensation capacitor loops, takes reactive power as a main mode and voltage as an auxiliary mode, the controller monitors the change of system voltage and reactive power in real time, combines the set upper voltage limit value, lower reactive power limit value, voltage adjustment coefficient and anti-shake delay fixed value, corresponds to the divided regions of the seventeen domain diagram, confirms the region where the current line operates, corresponds to the divided regions of the seventeen domain diagram, and performs corresponding operation, thereby realizing multi-stage fast switching, improving the compensation precision and reducing the switching times of the capacitor bank loop on the premise of ensuring the compensation effect.
Drawings
fig. 1 is a circuit structure diagram of a hybrid compensation device based on 124888 codes according to the present invention;
Fig. 2 is a control strategy diagram of a total common compensation device based on 124888 codes according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings and examples:
Referring to fig. 1, a circuit structure diagram of a total common compensation device based on 124888 codes is provided for the present invention;
As shown in fig. 1, a full common compensation device based on 124888 codes comprises: the system comprises a three-phase line acquisition device, six compensation loops 1C-6C and a controller;
The three-phase line acquisition device is arranged on the three-phase line and is used for detecting each phase voltage and current in the three-phase line; the six compensation circuits 1C-6C are arranged on three-phase lines L1, L2 and L3 in parallel, the six compensation circuits 1C-6C are respectively and electrically connected with the output end of the controller, and the output end of the three-phase line acquisition device is connected with the controller; the six compensation loops 1C-6C all adopt a co-compensation capacitor loop, wherein the six compensation loops adopt an 124888 coding mode to distribute the capacity of the co-compensation capacitor loop, and the controller combines seventeen domains to carry out switching operation on the six compensation loops.
In the embodiment of the utility model, the controller calculates the required reactive capacity of each phase through the sampling algorithm, and calculates the capacity difference value by combining the input capacity of the capacitor bank; with reactive compensation devices connected to the lines of each phase, the difference in capacity required for compensation of each phase is selected to cut off or put into the capacitor circuit in the reactive compensation device. The corresponding capacity ratio of the adopted 124888 coding mode is 1:2:4:8:8:8, and the continuous regulation of 31-gear capacity is realized by different combinations of six-circuit common compensation capacitor circuits.
The embodiment of the utility model provides an in, mend capacitor circuit altogether and include electric capacity triangle and connect electric capacity group return circuit, switching component and the control switch of method, the switching component is connected to the output in electric capacity group return circuit, the output of switching component passes through control switch and three-phase line connection.
wherein the control switch adopts a compound switch; the switching element adopts a dynamic compensation regulator.
Referring to fig. 2, a control strategy diagram of a total co-compensation method based on 124888 codes is proposed in the present invention.
As shown in fig. 2, seventeen domains are formed by dividing reactive power values and voltage values, wherein the voltage values include an undervoltage protection limit value, a voltage lower limit value, a voltage upper limit value and an overvoltage protection limit value; the reactive power value comprises a reactive power lower limit value and a reactive power upper limit value; the maximum adjustment voltage value delta u of the capacitor bank corresponding to the maximum value of the influence quantity of the reactive power of the input capacitor bank and the maximum adjustment reactive power value delta q of the capacity of the capacitor bank corresponding to the maximum value of the influence quantity of the reactive power of the input capacitor bank are combined to jointly divide the capacitor bank into seventeen domains.
The seventeen domains are specifically:
Region 1: when the lower limit of the reactive power is exceeded and the voltage exceeds the upper limit, the compensation controller calculates the required reactive capacity Q of each phase through a sampling algorithm, and the required reactive capacity Q is combined with the capacity Q of the capacitor which is put into use1calculating the capacity difference value delta Q, and when the controller calculates the value of the capacity corresponding to a certain phase delta Q to be 10Q1(Q1Capacitor capacity corresponding to the first single-phase loop), the capacitor capacity corresponding to the 1 st, 2 nd, 3 rd, 4 th, 5 th and 6 th loops of each phase set by the controller is Q1、2Q1、4Q1、8Q1、8Q1、8Q1When the 2 nd loop and the 4 th (5/6) loop are put into use, the 4 th (5/6) loop is cut off preferentially, and then the 2 nd loop is cut off; when the 2 nd loop is not put into use, the 3 rd loop is put into use and the 4 th (5/6 th) loop is put into use, the 4 th (5/6 th) loop is selected to be cut off, the 3 rd loop is cut off, the 2 nd loop is put into use, and the like, the optimal loop is selected to be cut off by combining the capacitor capacity corresponding to each phase loop set by the controller, the capacity delta Q is distributed most reasonably, the capacity of the cut capacitor loop is enabled to be closest to the delta Q, and finally the corresponding capacitor loop is selected from the put-into capacitor loops to be cut off.
Region 2, 3, 4: when the reactive power is normal and the voltage exceeds the upper limit, the compensation controller calculates the required reactive capacity Q of each phase by a sampling algorithm, and combines the capacity Q of the capacitor which is put into use1And calculating a capacity difference value delta Q, and distributing the capacity delta Q in combination with the capacitor capacity corresponding to each phase loop set by the controller to enable the capacity of the cut capacitor loop to be closest to the delta Q, and finally selecting the corresponding capacitor loop from the put capacitor loops to cut. The specific allocation is described in area 1.
region 5: when the reactive power exceeds the upper limit and the voltage exceeds the upper limit, the compensation controller calculates the reactive capacity Q required by each phase through a sampling algorithm, the capacity Q is distributed according to the capacity of the capacitor corresponding to each phase loop set by the controller, and the capacitor loop with the total capacity closest to Q is selected for input. The specific allocation is described in area 7.
Area 6: when the lower limit of the reactive power is exceeded, the compensation controller calculates the required reactive capacity Q of each phase through a sampling algorithm, and the required reactive capacity Q is combined with the capacity Q of the capacitor which is already put into use1And calculating a capacity difference value delta Q, carrying out the most reasonable decomposition on the capacity delta Q by combining the capacitor capacity corresponding to each phase loop set by the controller, enabling the cut capacitor loop capacity to be closest to the delta Q, and finally selecting the corresponding capacitor loop from the put capacitor loops for cutting. The specific allocation is described in area 1.
Region 7: when the reactive power exceeds the upper limit and the voltage approaches the upper limit, the compensation controller calculates the reactive capacity Q required by each phase through a sampling algorithm, and selects the capacitor circuit with the total capacity closest to Q to be put into use by combining the capacity of the capacitor corresponding to each phase circuit set by the controller and distributing the capacity Q. For example, when the controller calculates a corresponding required reactive capacity Q of 10Q1(Q1Capacitor capacity corresponding to the first single-phase loop), the capacitor capacity corresponding to the 1 st, 2 nd, 3 rd, 4 th, 5 th and 6 th loops of each phase set by the controller is Q1、2Q1、4Q1、8Q1、8Q1、8Q1When the 2 nd loop and the 4 th (5/6) loop are not put in, the 4 th (5/6) loop is put in preferentially, and the 2 nd loop is put in again; when the 2 nd circuit is already put in, the 3 rd circuit is not put in, and the 4 th (5/6) circuit is not put in, the 2 nd circuit is cut off first, the 4 th (5/6) circuit is selected to be put in, and finally the 3 rd circuit is put in, and the optimal circuit is selected to be put in.
Region 8: when the lower limit of the idle work is higher and the voltage is normal, the idle work capacity Q required by each phase is calculated, and the capacity Q of the capacitor which is put into use is combined1And calculating a capacity difference value delta Q, carrying out most reasonable distribution on the capacity delta Q by combining the capacitor capacity corresponding to each phase loop set by the controller, enabling the capacity of the cut capacitor loop to be closest to the delta Q, and finally selecting the corresponding capacitor loop from the put capacitor loops for cutting. The specific allocation is described in area 1.
Region 9: the reactive power is normal, the voltage is normal, the capacitor does not act, and the area is a normal working area.
Region 10: when the reactive power exceeds the upper limit and the voltage is normal, the compensation controller calculates the reactive capacity Q required by each phase through a sampling algorithm, the three-phase voltage and the three-phase current electric quantity of a line are collected through an independent split-phase alternating current sampling method, the electric parameters in a power grid are measured in real time through a Fourier algorithm, data obtained after A/D conversion are stored in a data storage device, the effective values of the voltage, the current and the three line voltages are calculated through the data, the parameters such as active power, reactive power, power factors and the like are calculated, the most reasonable distribution is carried out on the capacity Q by combining the capacity of a capacitor corresponding to each phase loop set by the controller, and the capacitor loop with the total capacity closest to the Q is selected for input. The specific allocation is described in area 7.
Region 11: when the lower limit of the idle work is over and the voltage is close to the lower limit, the idle work capacity Q required by each phase is calculated and combined with the capacity Q of the capacitor which is put into use1And calculating a capacity difference value delta Q, carrying out most reasonable distribution on the capacity delta Q by combining the capacitor capacity corresponding to each phase loop set by the controller, enabling the capacity of the cut capacitor loop to be closest to the delta Q, and finally selecting the corresponding capacitor loop from the put capacitor loops for cutting. The specific allocation is described in area 1.
Region 12: when the reactive power exceeds the upper limit and the voltage approaches the lower limit, the compensation controller calculates the reactive capacity Q required by each phase through a sampling algorithm, the capacity Q is distributed most reasonably by combining the capacity of the capacitor corresponding to each phase loop set by the controller, and the capacitor loop with the total capacity closest to Q is selected for input. The specific allocation is described in area 7.
Region 13: when the reactive power exceeds the lower limit and the voltage exceeds the lower limit, the reactive capacity Q required by each phase is calculated, and the added capacitor capacity Q is combined1And calculating a capacity difference value delta Q, and distributing the capacity delta Q in combination with the capacitor capacity corresponding to each phase loop set by the controller to enable the cut capacitor loop capacity to be closest to the delta Q, and finally selecting the corresponding capacitor loop from the put capacitor loops to cut. For details of the distribution, seeDescribed in region 1.
regions 14, 15, 16: when the reactive power is normal and the voltage exceeds the lower limit, the compensation controller calculates the reactive capacity Q required by each phase through a sampling algorithm, the capacity Q is distributed most reasonably by combining the capacity of the capacitor corresponding to each phase loop set by the controller, and the capacitor loop with the total capacity closest to Q is selected for input. See the embodiment of area 7.
Region 17: when the reactive power exceeds the upper limit and the voltage exceeds the lower limit, the compensation controller calculates the reactive capacity Q required by each phase through a sampling algorithm, the capacity Q is distributed most reasonably by combining the capacity of the capacitor corresponding to each phase loop set by the controller, and the capacitor loop with the total capacity closest to Q is selected for input. See the embodiment of area 7.
The device adopts a control mode that the reactive power is dominant and the voltage is auxiliary, the controller monitors the change of the system voltage and the reactive power in real time, and the change of the system voltage and the reactive power is combined with a set voltage upper limit value, a set voltage lower limit value, a set reactive power lower limit value, a set voltage adjustment coefficient, a set anti-shake delay fixed value, a set area divided by seventeen domains of graphs, an area where a current line runs is confirmed, a set area divided by the seventeen domains of graphs is corresponded, corresponding operation is carried out, multi-level fast switching is realized, the compensation precision is improved, and the switching times of a capacitor bank loop are reduced on the premise of.
in the embodiment of the utility model, each phase voltage, current and other signals of the circuit are collected by an independent split-phase AC sampling method, the effective values of each voltage, current and three line voltages are output, and parameters such as active power, reactive power, power factor and the like are calculated; the controller monitors the change of system voltage and reactive power in real time, acquires the three-phase voltage and three-phase current electric quantities of a line by an independent split-phase alternating current sampling method, measures the electric parameters in the power grid in real time by utilizing a Fourier algorithm, stores the data obtained after A/D conversion in a data memory, calculating effective values of voltage, current and three line voltages according to the data, calculating parameters such as active power, reactive power, power factor and the like, determining the current line operation area by combining the set voltage upper limit value, voltage lower limit value, reactive power lower limit value, voltage adjustment coefficient and anti-shake delay fixed value, and selecting corresponding capacitor loops to carry out switching operation corresponding to the divided areas of the seventeen-domain diagram, so that multi-level quick switching is realized, the compensation precision is improved, and the switching times of the capacitor bank loops are reduced on the premise of ensuring the compensation effect.
The embodiment of the utility model provides an in, distribute the capacitor circuit capacity of mending altogether based on 124888 encoding mode, can make the capacitor combination reach multistage regulation, improve the compensation precision.
While the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes, which relate to the related art known to those skilled in the art and fall within the scope of the present invention, can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (6)
1. A total common compensation device based on 124888 codes, which is characterized in that the device comprises: the system comprises a three-phase line acquisition device, six compensation loops and a controller;
The three-phase line acquisition device is arranged on the three-phase line and is used for detecting each phase voltage and current in the three-phase line; the six compensation circuits are arranged on the three-phase line in parallel, the six compensation circuits are respectively and electrically connected with the output end of the controller, and the output end of the three-phase line acquisition device is connected with the controller; the six compensation loops all adopt a common compensation capacitor loop, wherein the six compensation loops adopt an 124888 coding mode to distribute the capacity of the common compensation capacitor loop, and the controller combines seventeen domains to carry out switching operation on the six compensation loops.
2. The full-common compensation device based on 124888 codes according to claim 1, wherein the corresponding capacity ratio of the 124888 coding mode is 1:2:4:8:8:8, and the six-path common compensation capacitor circuit realizes 31-step capacity continuous adjustment through different combinations.
3. The 124888 code-based total compensation device according to claim 1, wherein the seventeen domains are formed by dividing reactive power values and voltage values, wherein the voltage values include an under-voltage protection limit value, a voltage lower limit value, a voltage upper limit value and an over-voltage protection limit value; the reactive power value comprises a reactive power lower limit value and a reactive power upper limit value; and combining the maximum adjustment voltage value of the capacitor group corresponding to the maximum value of the reactive influence quantity of the input capacitor group and the maximum adjustment reactive power value of the capacity of the capacitor group corresponding to the maximum value of the reactive influence quantity of the input capacitor group, and dividing the input capacitor group into seventeen domains.
4. the 124888 code-based total compensation device according to claim 1, wherein the total compensation capacitor circuit comprises a capacitor bank circuit connected with a capacitor delta, a switching element and a control switch, an output end of the capacitor bank circuit is connected with the switching element, and an output end of the switching element is connected with a three-phase line through the control switch.
5. The 124888 code-based total compensation device according to claim 4, wherein the control switch is a compound switch.
6. The 124888 code-based total compensation device according to claim 4, wherein the switching element is a dynamic compensation regulator.
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| CN201920305225.6U CN209786800U (en) | 2019-03-12 | 2019-03-12 | 124888-coding-based full-common compensation device |
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| CN201920305225.6U CN209786800U (en) | 2019-03-12 | 2019-03-12 | 124888-coding-based full-common compensation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109728589A (en) * | 2019-03-12 | 2019-05-07 | 安徽南瑞继远电网技术有限公司 | It is a kind of to be total to compensation device entirely based on 124888 codings |
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2019
- 2019-03-12 CN CN201920305225.6U patent/CN209786800U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109728589A (en) * | 2019-03-12 | 2019-05-07 | 安徽南瑞继远电网技术有限公司 | It is a kind of to be total to compensation device entirely based on 124888 codings |
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Effective date of registration: 20201224 Address after: 230000 No.90, science Avenue, high tech Zone, Hefei City, Anhui Province Patentee after: ANHUI NANRUI JIYUAN POWER GRID TECHNOLOGY Co.,Ltd. Patentee after: STATE GRID ANHUI ELECTRIC POWER Co.,Ltd. Patentee after: STATE GRID ANHUI ELECTRIC POWER CO., LTD. BENGBU POWER SUPPLY Co. Patentee after: STATE GRID ANHUI ELECTRIC POWER CO., LTD. HUAINAN POWER SUPPLY Co. Address before: 230000 No.90, science Avenue, high tech Zone, Hefei City, Anhui Province Patentee before: ANHUI NANRUI JIYUAN POWER GRID TECHNOLOGY Co.,Ltd. Patentee before: STATE GRID ANHUI ELECTRIC POWER Co.,Ltd. |
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