CN105866509A - Double-busbar current mutual induction sampling controller - Google Patents
Double-busbar current mutual induction sampling controller Download PDFInfo
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- CN105866509A CN105866509A CN201610291328.2A CN201610291328A CN105866509A CN 105866509 A CN105866509 A CN 105866509A CN 201610291328 A CN201610291328 A CN 201610291328A CN 105866509 A CN105866509 A CN 105866509A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a double-busbar current mutual induction sampling controller. A first busbar section, a second busbar section and a middle buscouple are each connected with three current sensors and three current transformers in series, two operational network circuits are connected behind every three current transformers, an analog switch is arranged on each output voltage signal path, switches control the states of the analog switches through encoders, and two current-type power amplifiers are connected to the positions behind each output voltage signal path. According to the double-busbar current mutual induction sampling controller, current transformer signals of the current transformers and buscouple switches which are arranged on the two busbar sections are automatically transformed into actual operating currents of the busbar sections according to the states of the switches arranged on the busbar sections; no matter the busbar sections are installed on the system side or the load side, the signals can be transformed into the equivalent operating currents of the system side or the load side, and therefore reactive and harmonic compensation devices independently work and are not affected.
Description
Technical field
The present invention relates to power system power supply field, particularly relate to a kind of double-bus Current Mutual Inductance sampling controller.
Background technology
Power system power supply side all uses the power supply system of double section bus for important user, it is therefore an objective to when one section of bus breaks down, can run through bus connection switch and obtain lasting power supply from other one section of bus.This improves the reliability of power supply, but double sections of buses bring difficulty to idle and harmonic compensation.
Reason is that idle and harmonic compensation compensation device needs size of current and the direction measuring on bus accurately, so as the compensation dosage needed for Ji Suaning, but in double sections of bussed supply systems, after one section of bus trips for some reason, bus connection switch is connected, other one section of bus is powered to load by different directions, and therefore the sense of current reverses so that hard-wired current transformer cannot correct measurement be idle and harmonic content.The controlling of sampling part of traditional active filter is all to calculate compensation electric current by the way of current transformer gathers load-side electric current, it is also possible to controlled by the sample rate current of system side.It is typically all the position installed according to on-the-spot current sample sensor and carries out corresponding controlling of sampling program, in the case of only one section of bus, can control to select the calculation of compensation electric current according to spot sampling, but at multistage bus, in the installation environment that operating mode is complicated, needing samples to switch to system side or load-side calculates the electric current needing to compensate, and now, single fixing controlling of sampling cannot meet requirement.Tackling if installing many set transformers, on the one hand needing to increase the input of transformer, on the other hand need idle and harmonic compensation equipment can gather the signal of multiple transformer simultaneously, exploitativeness is lacked for the equipment currently having been put into running.
Summary of the invention
For solving above-mentioned technical problem, the current transformer of two ends bus and the current transducer signal of bus connection switch position are automatically converted to the actual motion electric current of each section of bus according to the state of each section of bus-tie circuit breaker by the present invention automatically.No matter each section of bus installation site is in system side or in load-side, it is possible to be converted to system side or the running current of load-side of equivalence so that idle and harmonic compensation equipment works alone, unaffected.
No matter current transformer all can work alone in system side or load-side to it is an object of the invention to provide one, and can the idle double-bus Current Mutual Inductance sampling controller with harmonic content of correct measurement.
For achieving the above object, present invention provide the technical scheme that
nullA kind of double-bus Current Mutual Inductance sampling controller，It is used in double-bus electric current electric power system，Circuit includes the two sections of bus I sections in left and right、II section and middle mother，It is respectively provided with switch CB1、CB2 and CB3，3 groups of current transformer T1 of described double-bus Current Mutual Inductance sampling controller、T2 and T3 receives the current sampling signal of each section of bus，And through resistance R1 in parallel、R2、R3 is converted to voltage signal VT1、VT2、VT3，Described 3 groups of voltage signals are connected to 2 operational network circuit AM1、AM2，Operational network AM1、AM2 arranges analog switch M1 on output voltage signal path、M2，The status signal of bus-tie circuit breaker controls the state of analog switch by encoder，Make the machine voltage that analog switch output is corresponding，Often organizing 2 Current-mode Power Amplifier P1 and P2 of access after the machine voltage signal path of output，Machine voltage is converted to required current signal output.
Further, described operational network circuit AM1 is made up of subtractor, negater circuit and voltage follower, and wherein subtractor is difference channel, and it is VT1-VT3 that voltage signal VT1 and VT2 samples voltage output signal by subtractor；Voltage signal VT3 samples output voltage signal-VT3 through negater circuit；Voltage signal VT1 samples output voltage signal VT1 by voltage follower.
Further, described operational network circuit AM2 is made up of two voltage followers and an in-phase adder, and voltage signal VT2, VT3 sample output voltage VT2, VT3 by voltage follower；It is VT2+VT3 that voltage signal VT2, VT3 sample voltage output signal by in-phase adder.
Further, described analog switch switches output machine voltage according to the on off state of each section of bus, and when each section of bus is properly functioning, when mother disconnects, M1, M2 analog switch will be outputted on machine voltage VT1, VT2；When I section bus-tie circuit breaker disconnects, relying on bus connection switch when II section bus obtains power supply, analog switch will be outputted on machine voltage-VT3 and VT2+VT3；When II section bus-tie circuit breaker disconnects, relying on bus connection switch when I section bus obtains power supply, analog switch will be outputted on VT1-VT3 and VT3.
Further, described Current-mode Power Amplifier circuit is provided with error comparator, differential power amplifier and driving transformer, error comparator by use resistance sampling to output electric current and input voltage signal carry out application condition, amplified by differential power amplifier, driving transformer output current signal so that current signal forms proportional relation with input voltage signal.
Use technique scheme, there is advantages that
First, in double-bus Current Mutual Inductance sampling controller of the present invention, when either normal circuit operation or certain section of bus disconnect, the current signal exported by Current-mode Power Amplifier can react the electric current of actual motion in circuit, thus can be used for the compensation device on each section of bus and carry out idle and harmonic compensation.
Second, utilize the technology of the present invention, under the circuit with multistage bus, no matter current transformer all can work alone in system side or load-side, manual switching need not be carried out, automatically the current transformer of two ends bus and the current transducer signal of bus connection switch position are automatically converted to according to the state of each section of bus-tie circuit breaker the actual motion electric current of each section of bus.
Accompanying drawing explanation
Fig. 1 is the electrical schematics of double section bussed supplies in prior art；
Fig. 2 is the circuit diagram of double-bus Current Mutual Inductance sampling controller of the present invention；
Fig. 3 is the circuit diagram of operational network circuit AM1 in embodiment；
Fig. 4 is the circuit diagram of operational network circuit AM2 in embodiment；
Fig. 5 is the circuit diagram of Current-mode Power Amplifier in embodiment.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with the accompanying drawings and embodiment, the present invention is further elaborated.Should be appreciated that structure chart described herein and specific embodiment, only in order to explain the present invention, are not intended to limit the present invention.
Fig. 1 is the circuit diagram of double section bussed supplies in prior art, as shown in Figure 1, bus connection switch CB3 is off state under normal circumstances, the I section of the left and right sides and II section bus each independent operating, reactive current and harmonic distortion that now power load produces all can normally be detected, therefore can normally work.
When II section bus trips for some reason, then CB2 disconnects, and needs mother CB3 switch Guan Bi, makes II section bus obtain continued power by I section bus.But now the electric current of CT2 can not reflect the actual electricity consumption situation of the power load on II section bus, CT2 has actually sampled the output electric current of II section compensation device, therefore cannot carry out idle and harmonic compensation with the sample rate current of CT2；The electric current of CT1 sampling simultaneously contains the load current of II section bus, it is impossible to be considered as the actual current of the power load of I section bus, therefore can not carry out idle and harmonic compensation with the sample rate current of CT1.In like manner, when I section busbar trip, need via CB3 when II section obtains continued power, also cannot be carried out the most idle and harmonic compensation.
Embodiment
1
Fig. 2 is the circuit diagram of double-bus Current Mutual Inductance sampling controller of the present invention, as shown in Figure 2, circuit includes the two sections of bus I sections in left and right, II section and middle mother, it is respectively provided with switch CB1, CB2 and CB3, in bus I section, connect in II section and middle mother 3 current sensor CT1 respectively, CT2 and CT3 and 3 current transformer T1, T2 and T3, 2 operational network circuit AM1 are connected after 3 current transformers, AM2, every output voltage signal path arranges analog switch, switch CB1, CB2 and CB3 controls the state of analog switch by encoder, 2 Current-mode Power Amplifier P1 and P2 are accessed after every output voltage signal path.
The electric current flowed out from mother, I section bus and II section bus is sampled by current sensor, the current signal obtained is converted to voltage signal VT1, VT12 and VT3 by current transformer respectively, voltage signal exports corresponding voltage signal by operational network circuit, described switch CB1, CB2 and CB3 send binary command by encoder and control being opened or closed of described analog switch, select corresponding output voltage signal to be input to Current-mode Power Amplifier and are converted to current signal output.
Nominal situation: when CB1 closes, CB3 disjunction, during CB2 Guan Bi, binary command is sent by encoder, it is used for controlling the break-make of the switching signal K1 ~ K6 in analog switch M1 and M2, thus obtain sampled signal VT1 and the VT2 of output, it is proportional to the electric current of CT1 and CT2 by P1 and P2 output, is available for I section, the compensation device of II section bus carries out idle and harmonic compensation.
In the case of the main confession of I section bus: when CB1 closes, CB3 closes, during CB2 disjunction, control analog switch by encoder instruction and obtain sampled signal VT1-VT3 and VT3, the current signal of VT1-VT3 and VT3 it is proportional to by P1, P2 output, wherein VT1-VT3 represents the electric current of power load actual motion of I section bus, and VT3 represents the actual motion electric current of power load of II section bus, therefore can be used for the compensation device on each section of bus and carries out idle and harmonic compensation;
II section bus main in the case of: when CB1 disjunction, CB3 closes, and during CB2 Guan Bi, controls analog switch by encoder instruction and obtains sampled signal-VT3 and VT2+VT3.The current signal of-VT3 and VT2+VT3 it is proportional to by P1, P2 output, wherein-VT3 represents the electric current of power load actual motion of I section bus, and VT2+VT3 represents the actual motion electric current of power load of II section bus, therefore can be used for the compensation device on each section of bus and carries out idle and harmonic compensation;
No matter CT1, CT2 are arranged on system side also in load-side, and above-mentioned derivation is all set up, and each section of compensation device the most all can be made to work alone, and not switched by power-feed section is affected.
Embodiment
2
Fig. 3 is the circuit diagram of operational network circuit AM1, as it is shown on figure 3, A1 is the subtractor that typical difference channel realizes in figure, takes R1=R2=R3=R4, and the voltage signal now sampled from VT1 and VT2 of input is output as VT1-VT3；In figure, A2 is that negater circuit becomes output-VT3 by anti-phase for the VT3 of input；In figure, A3 is voltage follower, and input and output are VT1.
Fig. 4 is the circuit diagram of operational network circuit AM1, as shown in Figure 4, in figure, A4 and A6 part is voltage follower, it is respectively VT3 and VT2 by the most consistent with output signal for input, in figure, A5 is typical in-phase adder, taking R6=R3=R4, the voltage signal now sampled from VT2 and VT3 of input is output as VT2+VT3.
Embodiment
3
Fig. 5 is the circuit diagram of Current-mode Power Amplifier in preferred embodiment, as shown in Figure 5, in figure, Ap is error comparator, the output electric current and the input voltage signal Vi that are sampled by employing resistance R1 are carried out application condition and amplification, amplify rear drive transformator T1 by differential power amplifier and export a current signal Io so that Io with Vi is proportional.
Embodiment described above only have expressed embodiments of the present invention, and it describes more concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (5)
- null1. a double-bus Current Mutual Inductance sampling controller，It is used in double-bus electric current electric power system，Circuit includes the two sections of bus I sections in left and right、II section and middle mother，It is respectively provided with switch CB1、CB2 and CB3，It is characterized in that: 3 groups of current transformer T1 of described double-bus Current Mutual Inductance sampling controller、T2 and T3 receives the current sampling signal of each section of bus，And through resistance R1 in parallel、R2、R3 is converted to voltage signal VT1、VT2、VT3，Described 3 groups of voltage signals are connected to 2 operational network circuit AM1、AM2，Operational network AM1、AM2 arranges analog switch M1 on output voltage signal path、M2，The status signal of bus-tie circuit breaker controls the state of analog switch by encoder，Make the machine voltage that analog switch output is corresponding，Often organizing 2 Current-mode Power Amplifier P1 and P2 of access after the machine voltage signal path of output，Machine voltage is converted to required current signal output.
- Double-bus Current Mutual Inductance sampling controller the most according to claim 1, it is characterized in that: described operational network circuit AM1 is made up of subtractor, negater circuit and voltage follower, wherein subtractor is difference channel, and it is VT1-VT3 that voltage signal VT1 and VT2 samples voltage output signal by subtractor；Voltage signal VT3 samples output voltage signal-VT3 through negater circuit；Voltage signal VT1 samples output voltage signal VT1 by voltage follower.
- Double-bus Current Mutual Inductance sampling controller the most according to claim 1, it is characterized in that: described operational network circuit AM2 is made up of two voltage followers and an in-phase adder, and voltage signal VT2, VT3 sample output voltage VT2, VT3 by voltage follower；It is VT2+VT3 that voltage signal VT2, VT3 sample voltage output signal by in-phase adder.
- Double-bus Current Mutual Inductance sampling controller the most according to claim 1, it is characterized in that: described analog switch switches output machine voltage according to the on off state of each section of bus, when each section of bus is properly functioning, when mother disconnects, M1, M2 analog switch will be outputted on machine voltage VT1, VT2；When I section bus-tie circuit breaker disconnects, relying on bus connection switch when II section bus obtains power supply, analog switch will be outputted on machine voltage-VT3 and VT2+VT3；When II section bus-tie circuit breaker disconnects, relying on bus connection switch when I section bus obtains power supply, analog switch will be outputted on VT1-VT3 and VT3.
- Double-bus Current Mutual Inductance sampling controller the most according to claim 1, it is characterized in that: described Current-mode Power Amplifier circuit is provided with error comparator, differential power amplifier and driving transformer, error comparator by use resistance sampling to output electric current and input voltage signal carry out application condition, amplified by differential power amplifier, driving transformer output current signal so that current signal forms proportional relation with input voltage signal.
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| CN201610291328.2A CN105866509B (en) | 2016-05-05 | 2016-05-05 | A kind of double-bus Current Mutual Inductance sampling controller |
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| CN105866509B CN105866509B (en) | 2018-11-23 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203071579U (en) * | 2012-12-28 | 2013-07-17 | 安徽天沃电气技术有限公司 | SVG (Static Var Generator) control system specially used for low-voltage double-bus double-segment wiring |
| CN203312817U (en) * | 2013-06-04 | 2013-11-27 | 安徽天沃电气技术有限公司 | Low voltage reactive power compensating device |
| CN104459303A (en) * | 2014-12-24 | 2015-03-25 | 国家电网公司 | Double-bus self-adaption sampling line selection device |
| CN105044430A (en) * | 2015-06-05 | 2015-11-11 | 广东电网有限责任公司佛山供电局 | Branch current detection method and system of double-bus distribution equipment parallel outlet wires |
| CN205749644U (en) * | 2016-05-05 | 2016-11-30 | 北京英博电气股份有限公司 | A kind of double-bus Current Mutual Inductance sampling controller |
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- 2016-05-05 CN CN201610291328.2A patent/CN105866509B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203071579U (en) * | 2012-12-28 | 2013-07-17 | 安徽天沃电气技术有限公司 | SVG (Static Var Generator) control system specially used for low-voltage double-bus double-segment wiring |
| CN203312817U (en) * | 2013-06-04 | 2013-11-27 | 安徽天沃电气技术有限公司 | Low voltage reactive power compensating device |
| CN104459303A (en) * | 2014-12-24 | 2015-03-25 | 国家电网公司 | Double-bus self-adaption sampling line selection device |
| CN105044430A (en) * | 2015-06-05 | 2015-11-11 | 广东电网有限责任公司佛山供电局 | Branch current detection method and system of double-bus distribution equipment parallel outlet wires |
| CN205749644U (en) * | 2016-05-05 | 2016-11-30 | 北京英博电气股份有限公司 | A kind of double-bus Current Mutual Inductance sampling controller |
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Effective date of registration: 20201010 Address after: 100070 No. 188, No. ten, No. two, building, base, Fengtai District, Beijing Patentee after: BEIJING IN-POWER ELECTRIC Co.,Ltd. Patentee after: LANGFANG IN-POWER ELECTRIC Co.,Ltd. Address before: 100070 No. 188, No. ten, No. two, building, base, Fengtai District, Beijing Patentee before: BEIJING IN-POWER ELECTRIC Co.,Ltd. Patentee before: LANGFANG IN-POWER ELECTRIC Co.,Ltd. Patentee before: BEIJING IN-POWER NEW ENERGY Co.,Ltd. |
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