CN104459303B - A kind of adaptively sampled line selection apparatus of double-bus - Google Patents
A kind of adaptively sampled line selection apparatus of double-bus Download PDFInfo
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Abstract
The present invention discloses a kind of adaptively sampled line selection apparatus of double-bus, comprises the first bus, the 2nd bus, the first voltage transformer, the 2nd voltage transformer, the first switch circuit, the 2nd switch circuit, current transformer, the first analogue signal acquisition circuit, the 2nd analogue signal acquisition circuit, the 3rd analogue signal acquisition circuit, principal controller and main-transformer; Can gather by the control of switch circuit and principal controller automatically and calculate wattless power. The wattless power collection that the adaptively sampled line selection apparatus of the double-bus of the present invention can correctly, reliably realize main-transformer calculates, ensure that the exactness of follow-up power quality controlling and validity, provide aided solving and measurement accurately for effectively reducing the loss of transmitting line.
Description
Technical field
The present invention relates to a kind of adaptively sampled line selection apparatus of bus, particularly relate to a kind of adaptively sampled line selection apparatus calculating double-bus wattless power.
Background technology
In 220KV substation, generally all can there be many buses, multiple stage main-transformer, every bar bus has affiliated PT. Certain specific main-transformer can be articulated on certain specific bus as required. Idle compensating control it is generally required to compensate the wattless power of certain main-transformer, so needing sampling to calculate the wattless power flowing through this main-transformer.
The controller of current each reactive-load compensation producer generally all only possesses one group of PCC point voltage sampling ability, so there will be the situation of sampling dislocation. Some producers are in order to avoid the appearance of this kind of situation, and exterior design manual electric change-over switch realizes the PT switching of main-transformer voltage sample. The mode of manual switchover exists that wiring point is many, device volume is big, cost is higher, reliability is poor, the problems such as short circuit phenomenon easily occur in handoff procedure, has been not suitable with the operating requirement of present unattended operation transformer station.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art, it is provided that a kind of adaptively sampled line selection apparatus of double-bus, the voltage in double-bus can be sampled by automatically, sample error not easily occurs, reliability height.
The technical solution adopted for the present invention to solve the technical problems is: a kind of adaptively sampled line selection apparatus of double-bus, comprises the first bus, the 2nd bus, the first voltage transformer, the 2nd voltage transformer, the first switch circuit, the 2nd switch circuit, current transformer, the first analogue signal acquisition circuit, the 2nd analogue signal acquisition circuit, the 3rd analogue signal acquisition circuit, principal controller and main-transformer;
Described principal controller comprises the first digital signal processing module, the 2nd digital signal processing module, the 3rd digital signal processing module, logic judgment module and wattless power and calculates module; Described logic judgment module comprises the first switch and the 2nd switch; By connecting after the first switch, wattless power calculates module in the output of described first digital signal processing module; By connecting after the 2nd switch, wattless power calculates module in the output of described 2nd digital signal processing module; The output terminal of described 3rd digital signal processing module calculates module with described wattless power and is connected;
The input terminus of described first voltage transformer is connected with described first bus, and the output terminal of described first voltage transformer is connected with the input terminus of the first analogue signal acquisition circuit; The output terminal of described first analogue signal acquisition circuit is connected with the input terminus of the first digital signal processing module in described principal controller; The first voltage transitions on first bus is become the first measurement voltage by described first voltage transformer; Described first analogue signal acquisition circuit gathers the first measurement voltage that the first voltage transformer exports, and exports the first digital signal processing module in the first voltage analog to described principal controller; This first voltage analog is converted to the first voltage digital amount that can calculate by described first digital signal processing module;
The input terminus of described 2nd voltage transformer is connected with described 2nd bus, and the output terminal of described 2nd voltage transformer is connected with the input terminus of the 2nd analogue signal acquisition circuit; The output terminal of described 2nd analogue signal acquisition circuit is connected with the input terminus of the 2nd digital signal processing module in described principal controller; The 2nd voltage transitions on 2nd bus is become the 2nd measurement voltage by described 2nd voltage transformer; Described 2nd analogue signal acquisition circuit gathers the 2nd measurement voltage that the 2nd voltage transformer exports, and exports the first digital signal processing module in the 2nd voltage analog to described principal controller; 2nd voltage analog is converted to the first voltage digital amount that can calculate by described 2nd digital signal processing module;
The input terminus of described first switch circuit is connected with described first bus; The output terminal of described first switch circuit is connected with the first input terminus of logic judgment module in described principal controller, by the switch status information transmission of described first switch circuit to the logic judgment module of principal controller;
The input terminus of described 2nd switch circuit is connected with described 2nd bus, the output terminal of described 2nd switch circuit is connected with the 2nd input terminus of logic judgment module in described principal controller, by the switch status information transmission of described 2nd switch circuit to the logic judgment module of principal controller;
The node that the output terminal of described first switch circuit is connected with the output terminal of described 2nd switch circuit is connected with the input terminus of described current transformer; The output terminal of described current transformer is connected with the input terminus of described 3rd analogue signal acquisition circuit; The output terminal of described 3rd analogue signal acquisition circuit is connected with the input terminus of the 3rd digital signal processing module in described principal controller; When the first switch circuit is closed, the 2nd switch circuit disconnects, the first electric current that the first bus is exported by described current transformer converts the first measurement electric current to; Described 3rd analogue signal acquisition circuit gathers the first measurement electric current that current transformer exports, and exports the 3rd digital signal processing module in the first current-mode analog quantity to described principal controller; First current-mode analog quantity is converted to by described 3rd digital signal processing module can for the first current digital amount calculated; When the first switch circuit disconnection, the 2nd switch circuit close, the 2nd electric current that the 2nd bus is exported by described current transformer converts the 2nd measurement electric current to; Described 3rd analogue signal acquisition circuit gathers the 2nd measurement electric current that current transformer exports, and exports the 3rd digital signal processing module in the 2nd current-mode analog quantity to described principal controller; 2nd current-mode analog quantity is converted to by described 3rd digital signal processing module can for the 2nd current digital amount calculated;
Described main-transformer is connected with the output terminal of described current transformer;
Wherein, the logic judgment module in described principal controller comprises interlocking algorithm process unit, and the first switch in principal controller and the 2nd switch can not be closed simultaneously; When the first switch circuit closes, when 2nd switch circuit disconnects, described logic judgment module controls the first switch and closes, and the 2nd switch disconnects, and makes the first voltage digital amount and the first current digital amount transfer to described wattless power calculating module and calculates the wattless power on the first bus; When the 2nd switch circuit closes, when first switch disconnects, described logic judgment module control the 2nd switch closes, and the first switch disconnects, and makes the 2nd voltage digital amount and the 2nd current digital amount transfer to described wattless power and calculates the wattless power on module calculating the 2nd bus.
Preferably, the analog quantity collected is carried out Digital Discrete sampling by the first digital signal processing module in described principal controller, the 2nd digital signal processing module and the 3rd digital signal processing module; Described wattless power calculates the calculation formula of module employing:
Wherein, QSamplingFor the wattless power that wattless power calculating module calculates, N is voltage signal and the sampling point number in electric current each cycle of signal, and u (n+N/4) is voltage sample momentary value, and i (n) is current sample momentary value.
Preferably, logic judgment module in described principal controller also comprises redundancy logic processing unit, when the first switch circuit and the 2nd switch circuit are simultaneously closed described logic control module force control the first switch and the 2nd switch one of them for closed state, another is off state.
Preferably, described principal controller also comprises alarm module, gives the alarm by alarm module when the first switch circuit and the 2nd switch circuit are simultaneously closed.
Preferably, the first digital signal processing module in described principal controller, the 2nd digital signal processing module and the 3rd digital signal processing module all adopt model to be the chip of ADS8364, and described logic judgment module and wattless power calculate module and all adopt TMS32F2812 chip.
The invention has the beneficial effects as follows:
1. the sampling problem of misalignment that can not produce because of voltage transformer switching;
2. floor space is little, cost is low, reliability height.
3. use the idle compensating control of this technology, it is possible to the wattless power collection correctly, reliably realizing main-transformer calculates, and ensure that the exactness of follow-up power quality controlling and validity. Correctly effectively carry out power quality controlling, it is possible to effectively reduce the loss of transmitting line, expand transmitting line ability to transmit electricity, reduce power station enter phase operating pressure.
Below in conjunction with drawings and Examples, the present invention is described in further detail; But the adaptively sampled line selection apparatus of a kind of double-bus of the present invention is not limited to embodiment.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the present invention.
Embodiment
Embodiment
Shown in Figure 1, the adaptively sampled line selection apparatus of a kind of double-bus of the present invention, comprises the first bus 101, the 2nd bus 102, first voltage transformer 201, the 2nd voltage transformer 202, first switch circuit 401, the 2nd switch circuit 402, current transformer 50, first analogue signal acquisition circuit 301, the 2nd analogue signal acquisition circuit 302, the 3rd analogue signal acquisition circuit 303, principal controller 70 and main-transformer 60;
Described principal controller 70 comprises the first digital signal processing module 701, the 2nd digital signal processing module 702, the 3rd digital signal processing module 703, logic judgment module 704 and wattless power and calculates module 705; Described logic judgment module 704 comprises the first switch 7041 and the 2nd switch 7042; The output of described first digital signal processing module 701 calculates module 705 by connecting wattless power after the first switch 7041; The output of described 2nd digital signal processing module 702 calculates module 705 by connecting wattless power after the 2nd switch 7042; The output of described 3rd digital signal processing module 703 connects described wattless power and calculates module 705;
The input terminus of described first voltage transformer 201 is connected with described first bus 101, and the output terminal of described first voltage transformer 201 is connected with the input terminus of the first analogue signal acquisition circuit 301; The output terminal of described first analogue signal acquisition circuit 301 is connected with the input terminus of the first digital signal processing module in described principal controller 70; First voltage transitions of on the first bus 101 is become the first measurement voltage by described first voltage transformer 201; Described first analogue signal acquisition circuit 301 gathers the first measurement voltage that the first voltage transformer 201 exports, and exports the first digital signal processing module 701 in the first voltage analog to described principal controller 70; This first voltage analog is converted to the first voltage digital amount that can calculate by described first digital signal processing module 701;
The input terminus of described 2nd voltage transformer 202 is connected with described 2nd bus 102, and the output terminal of described 2nd voltage transformer 202 is connected with the input terminus of the 2nd analogue signal acquisition circuit 301; The output terminal of described 2nd analogue signal acquisition circuit 301 is connected with the input terminus of the 2nd digital signal processing module 702 in described principal controller 70; The 2nd voltage transitions on 2nd bus 102 is become the 2nd measurement voltage by described 2nd voltage transformer 202; Described 2nd analogue signal acquisition circuit 302 gathers the 2nd measurement voltage that the 2nd voltage transformer 202 exports, and exports the first digital signal processing module in the 2nd voltage analog to described principal controller 70; 2nd voltage analog is converted to the first voltage digital amount that can calculate by described 2nd digital signal processing module 702;
The input terminus of described first switch circuit 401 is connected with described first bus 101; The output terminal of described first switch circuit 401 is connected with the first input terminus of logic judgment module in described principal controller 70, by the switch status information transmission of described first switch circuit 401 to the logic judgment module 704 of principal controller 70;
402 input terminuss of described 2nd switch circuit are connected with described 2nd bus 102, the output terminal of described 2nd switch circuit 402 is connected with the 2nd input terminus of logic judgment module 704 in described principal controller 70, by the switch status information transmission of described 2nd switch circuit 402 to the logic judgment module 704 of principal controller 70;
The node that the output terminal of described first switch circuit 401 is connected with the output terminal of described 2nd switch circuit 402 is connected with the input terminus of described current transformer 50; The output terminal of described current transformer 50 is connected with the input terminus of described 3rd analogue signal acquisition circuit 303; The output terminal of described 3rd analogue signal acquisition circuit 303 is connected with the input terminus of the 3rd digital signal processing module 703 in described principal controller 70; When the first switch circuit 401 is closed, the 2nd switch circuit 402 disconnects, described current transformer 50 converts the first electric current that the first bus 101 exports to first measurement electric current; Described 3rd analogue signal acquisition circuit 303 gathers the first measurement electric current that current transformer 50 exports, and exports the 3rd digital signal processing module 703 in the first current-mode analog quantity to described principal controller 70; First current-mode analog quantity is converted to by described 3rd digital signal processing module 703 can for the first current digital amount calculated; When the first switch circuit 401 disconnect, the 2nd switch circuit closed 402 time, the 2nd electric current that the 2nd bus 102 is exported by described current transformer 50 converts the 2nd measurement electric current to; Described 3rd analogue signal acquisition circuit 303 gathers the 2nd measurement electric current that current transformer 50 exports, and exports the 3rd digital signal processing module 703 in the 2nd current-mode analog quantity to described principal controller 70; 2nd current-mode analog quantity is converted to by described 3rd digital signal processing module 703 can for the 2nd current digital amount calculated;
Described main-transformer 60 is connected with the output terminal of described current transformer 50;
Wherein, the logic judgment module 704 in described principal controller 70 comprises interlocking algorithm process unit, and the first switch 7041 in principal controller 70 and the 2nd switch 7042 can not be closed simultaneously; When the first switch circuit 401 closes, when 2nd switch circuit 402 disconnects, described logic judgment module 704 controls the first switch 7041 and closes, 2nd switch 7042 disconnects, and makes the first voltage digital amount and the first current digital amount transfer to described wattless power calculating module 705 and calculates the wattless power on the first bus 101; When the 2nd switch circuit 402 closes, when first switch circuit 401 disconnects, described logic judgment module 704 controls the 2nd switch 7042 and closes, first switch 7041 disconnects, and makes the 2nd voltage digital amount and the 2nd current digital amount transfer to described wattless power calculating module 705 and calculates the wattless power on the 2nd bus 102.
Further, the analog quantity collected is carried out Digital Discrete sampling by the first digital signal processing module 701 in described principal controller 70, the 2nd digital signal processing module 702 and the 3rd digital signal processing module 703; Described wattless power calculates the calculation formula of module 705 employing:
Wherein, QSamplingFor the wattless power that wattless power calculating module 705 calculates, N is voltage signal and the sampling point number in electric current each cycle of signal, and u (n+N/4) is voltage sample momentary value, and i (n) is current sample momentary value.
Further, logic judgment module 704 in described principal controller 70 also comprises redundancy logic processing unit, when the first switch circuit 401 and the 2nd switch circuit 402 are simultaneously closed described logic control module 704 force control the first switch 7041 and the 2nd switch 7042 one of them for closed state, another is off state.
Further, described principal controller 70 also comprises alarm module, gives the alarm by alarm module when the first switch circuit 401 and the 2nd switch circuit 402 are simultaneously closed.
Further, the first digital signal processing module 701 in described principal controller 70, the 2nd digital signal processing module 702 and the 3rd digital signal processing module 703 all adopt model to be the chip of ADS8364, and described logic judgment module 704 and wattless power calculate module 705 and all adopt TMS32F2812 chip.
Above-described embodiment is only used for illustrating further the adaptively sampled line selection apparatus of a kind of double-bus of the present invention; but the present invention is not limited to embodiment; every any simple modification, equivalent variations and modification above embodiment done according to the technical spirit of the present invention, all falls in the protection domain of technical solution of the present invention.
Claims (5)
1. the adaptively sampled line selection apparatus of double-bus, it is characterized in that, comprise the first bus, the 2nd bus, the first voltage transformer, the 2nd voltage transformer, the first switch circuit, the 2nd switch circuit, current transformer, the first analogue signal acquisition circuit, the 2nd analogue signal acquisition circuit, the 3rd analogue signal acquisition circuit, principal controller and main-transformer;
Described principal controller comprises the first digital signal processing module, the 2nd digital signal processing module, the 3rd digital signal processing module, logic judgment module and wattless power and calculates module; Described logic judgment module comprises the first switch and the 2nd switch; By connecting after the first switch, wattless power calculates module in the output of described first digital signal processing module; By connecting after the 2nd switch, wattless power calculates module in the output of described 2nd digital signal processing module; The output terminal of described 3rd digital signal processing module calculates module with described wattless power and is connected;
The input terminus of described first voltage transformer is connected with described first bus, and the output terminal of described first voltage transformer is connected with the input terminus of the first analogue signal acquisition circuit; The output terminal of described first analogue signal acquisition circuit is connected with the input terminus of the first digital signal processing module in described principal controller; The first voltage transitions on first bus is become the first measurement voltage by described first voltage transformer; Described first analogue signal acquisition circuit gathers the first measurement voltage that the first voltage transformer exports, and exports the first digital signal processing module in the first voltage analog to described principal controller; This first voltage analog is converted to the first voltage digital amount that can calculate by described first digital signal processing module;
The input terminus of described 2nd voltage transformer is connected with described 2nd bus, and the output terminal of described 2nd voltage transformer is connected with the input terminus of the 2nd analogue signal acquisition circuit; The output terminal of described 2nd analogue signal acquisition circuit is connected with the input terminus of the 2nd digital signal processing module in described principal controller; The 2nd voltage transitions on 2nd bus is become the 2nd measurement voltage by described 2nd voltage transformer; Described 2nd analogue signal acquisition circuit gathers the 2nd measurement voltage that the 2nd voltage transformer exports, and exports the first digital signal processing module in the 2nd voltage analog to described principal controller; 2nd voltage analog is converted to the first voltage digital amount that can calculate by described 2nd digital signal processing module;
The input terminus of described first switch circuit is connected with described first bus; The output terminal of described first switch circuit is connected with the first input terminus of logic judgment module in described principal controller, by the switch status information transmission of described first switch circuit to the logic judgment module of principal controller;
The input terminus of described 2nd switch circuit is connected with described 2nd bus, the output terminal of described 2nd switch circuit is connected with the 2nd input terminus of logic judgment module in described principal controller, by the switch status information transmission of described 2nd switch circuit to the logic judgment module of principal controller;
The node that the output terminal of described first switch circuit is connected with the output terminal of described 2nd switch circuit is connected with the input terminus of described current transformer; The output terminal of described current transformer is connected with the input terminus of described 3rd analogue signal acquisition circuit; The output terminal of described 3rd analogue signal acquisition circuit is connected with the input terminus of the 3rd digital signal processing module in described principal controller; When the first switch circuit is closed, the 2nd switch circuit disconnects, the first electric current that the first bus is exported by described current transformer converts the first measurement electric current to; Described 3rd analogue signal acquisition circuit gathers the first measurement electric current that current transformer exports, and exports the 3rd digital signal processing module in the first current-mode analog quantity to described principal controller; First current-mode analog quantity is converted to by described 3rd digital signal processing module can for the first current digital amount calculated; When the first switch circuit disconnection, the 2nd switch circuit close, the 2nd electric current that the 2nd bus is exported by described current transformer converts the 2nd measurement electric current to; Described 3rd analogue signal acquisition circuit gathers the 2nd measurement electric current that current transformer exports, and exports the 3rd digital signal processing module in the 2nd current-mode analog quantity to described principal controller; 2nd current-mode analog quantity is converted to by described 3rd digital signal processing module can for the 2nd current digital amount calculated;
Described main-transformer is connected with the output terminal of described current transformer;
Wherein, the logic judgment module in described principal controller comprises interlocking algorithm process unit, and the first switch in principal controller and the 2nd switch can not be closed simultaneously; When the first switch circuit closes, when 2nd switch circuit disconnects, described logic judgment module controls the first switch and closes, and the 2nd switch disconnects, and makes the first voltage digital amount and the first current digital amount transfer to described wattless power calculating module and calculates the wattless power on the first bus; When the 2nd switch circuit closes, when first switch disconnects, described logic judgment module control the 2nd switch closes, and the first switch disconnects, and makes the 2nd voltage digital amount and the 2nd current digital amount transfer to described wattless power and calculates the wattless power on module calculating the 2nd bus.
2. a kind of adaptively sampled line selection apparatus of double-bus according to claim 1, it is characterised in that: the analog quantity collected is carried out Digital Discrete sampling by the first digital signal processing module in described principal controller, the 2nd digital signal processing module and the 3rd digital signal processing module; Described wattless power calculates the calculation formula of module employing:
Wherein, QSamplingFor the wattless power that wattless power calculating module calculates, N is voltage signal and the sampling point number in electric current each cycle of signal, and u (n+N/4) is voltage sample momentary value, and i (n) is current sample momentary value.
3. a kind of adaptively sampled line selection apparatus of double-bus according to claim 1, it is characterized in that: the logic judgment module in described principal controller also comprises redundancy logic processing unit, when the first switch circuit and the 2nd switch circuit are simultaneously closed described logic control module force control the first switch and the 2nd switch one of them for closed state, another is off state.
4. a kind of adaptively sampled line selection apparatus of double-bus according to claim 3, it is characterised in that: described principal controller also comprises alarm module, gives the alarm by alarm module when the first switch circuit and the 2nd switch circuit are simultaneously closed.
5. a kind of adaptively sampled line selection apparatus of double-bus according to claim 1, it is characterized in that: the first digital signal processing module in described principal controller, the 2nd digital signal processing module and the 3rd digital signal processing module all adopt model to be the chip of ADS8364, and described logic judgment module and wattless power calculate module and all adopt TMS32F2812 chip.
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| CN105866509B (en) * | 2016-05-05 | 2018-11-23 | 北京英博电气股份有限公司 | A kind of double-bus Current Mutual Inductance sampling controller |
| CN111722148B (en) * | 2020-07-06 | 2023-03-21 | 浙江中控技术股份有限公司 | Fault diagnosis system of current sampling resistor circuit |
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