CN204103457U - Based on the hydraulic generator same period and the protection integration unit of AC sampling - Google Patents
Based on the hydraulic generator same period and the protection integration unit of AC sampling Download PDFInfo
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- CN204103457U CN204103457U CN201420528618.0U CN201420528618U CN204103457U CN 204103457 U CN204103457 U CN 204103457U CN 201420528618 U CN201420528618 U CN 201420528618U CN 204103457 U CN204103457 U CN 204103457U
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Abstract
Based on the hydraulic generator same period and the protection integration unit of AC sampling, comprise power circuit, alternating current sampling circuit, host CPU, cpu interface circuit, communicating circuit, key circuit, display circuit, phase angle difference decision circuitry; Described power circuit, alternating current sampling circuit, cpu interface circuit, communicating circuit, key circuit, display circuit are connected respectively to described host CPU.It is little that device of the present utility model has device volume; easy for installation; data sampling is accurate, operate time of protection is rapid and accurate, grid-connected immediate stability more; the trouble and managing power that also tool is very strong simultaneously realizes failture evacuation quickly; and communication can be carried out with host computer, a kind of automatic Control System of Hydropower Station new device that suitable environment is wider.
Description
[technical field]
The utility model belongs to electric and electronic technical field, is specifically related to a kind of hydraulic generator same period based on AC sampling and protection integration unit, is particularly suitable for Medium and Small Hydraulic Generator group.
[background technology]
Protective device and synchronous device play a part to ensure that power system safety and stability runs in electric power system, can improve the economic benefit of electrical network.Current most equipment is all that simple function only possesses synchronization function, or only possesses defencive function.
Defencive function shows control loop output alarm signal or directly acts on tripping operation or stopping signal.Most medium waterpower generator station adopts relay system overvoltage, overcurrent protective device or common analog parameter sampling device in the market, and its defect is that sample rate is uncontrollable, affects its quick-action; Sampled data is inaccurate, causes false protection or is failure to actuate, and affects its reliability, there is certain potential safety hazard.
Synchronization function refers to and realizes pressure reduction between generating set and mains voltage signal and direction thereof, frequency difference and direction thereof, the detection of phase difference etc. and judgement.Current many mid-small hydropower plant still adopt synchronous indicating device, and the even direct manual operation had is grid-connected, and accuracy is not high, and risk is larger; Or adopting analog automatic sub-synchronous device, a kind of equipment of pure hardware, does not have tight Mathematical Modeling, grid-connectedly may produce larger impact to unit.Therefore, in order to treat that generating set is also connected to the grid more rapidly, accurately and stably, the microcomputer type automatic sub-synchronous device developing a kind of low-cost and high-performance will be significant.
[summary of the invention]
Technical problem to be solved in the utility model is to provide a kind of hydraulic generator same period based on AC sampling and protection integration unit; it is little that this device has device volume; easy for installation; data sampling is accurate, operate time of protection is rapid and accurate, grid-connected immediate stability more; the trouble and managing power that also tool is very strong simultaneously realizes failture evacuation quickly; and communication can be carried out with host computer, a kind of automatic Control System of Hydropower Station new device that suitable environment is wider.
The utility model is achieved in that
Based on the hydraulic generator same period and the protection integration unit of AC sampling, comprise power circuit, alternating current sampling circuit, host CPU, cpu interface circuit, communicating circuit, key circuit, display circuit, phase angle difference decision circuitry;
Described power circuit, alternating current sampling circuit, cpu interface circuit, communicating circuit, key circuit, display circuit are connected respectively to described host CPU;
Described power circuit comprises DC24V power module, AC220V power module; Described DC24V power module comprises power supply input over-voltage over-current protection circuit, a DC/DC power-switching circuit; Outside storage battery 24V receives described power supply input over-voltage over-current protection circuit, and described power supply input over-voltage over-current protection circuit is connected to a described DC/DC power-switching circuit; Described AC220V power module comprises AC/DC power-switching circuit, the 2nd DC/DC power-switching circuit; Station service 220V receives described AC/DC power-switching circuit, and described AC/DC power-switching circuit is connected to described 2nd DC/DC power-switching circuit;
Described cpu interface circuit comprises to be opened into circuit, digital output circuit, reset circuit;
Described alternating current sampling circuit comprises machine end AD sampling A/D chip, system AD sampling A/D chip, machine end current sampling circuit, set end voltage sample circuit, system voltage sample circuit, system frequency measurement circuit, machine end frequency measurement circuit;
Described machine end current sampling circuit and set end voltage sample circuit are connected respectively to described machine end AD sampling A/D chip; Described system voltage sample circuit is connected to described system AD sampling A/D chip; Described system frequency measurement circuit and machine end frequency measurement circuit are connected respectively to described phase angle difference decision circuitry; Described phase angle difference decision circuitry is connected to described display circuit;
Described display circuit comprises digital-scroll technique, state instruction, synchronizing instruction.
Further, described communicating circuit is RS485 interface circuit.
The utility model has the advantage of: 1, certainty of measurement is high, it is more accurate that Control protection action is set.The machine end AD acquisition chip of alternating current sampling circuit and system AD acquisition chip, all adopt 16 special A/D chip, Acquisition Circuit potential and current transformers all adopts the device that precision is higher, makes acquisition precision higher, and equipment control action is accurate.2, circuit is simple, realizes equipment automatization cost low.In circuit design, some main circuit all adopt shared design, make hardware circuit fairly simple, reduce the overall cost of equipment.3, communication interface is convenient, control is flexible.The utility model adopts RS485 interface mode and outside to carry out communication, adopts MODBUS communication protocol, directly can read all measurement parameters and parameters data, can directly be controlled equipment by parameters.4, functional integration is higher, safeguards easy for installation.The utility model volume is little, and the simple installation and maintenance of wiring is convenient, and an equipment just can realize generator unit simultaneous interconnecting and generating set defencive function.
[accompanying drawing explanation]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the utility model hardware configuration schematic diagram.
Fig. 2 is the utility model synchronization function implementation structure schematic diagram.
Fig. 3 is the utility model defencive function implementation structure schematic diagram.
Fig. 4 is the utility model and external cabling schematic diagram.
[embodiment]
As shown in Figure 1, based on the hydraulic generator same period and the protection integration unit of AC sampling, power circuit, alternating current sampling circuit, host CPU, cpu interface circuit, communicating circuit, key circuit, display circuit, phase angle difference decision circuitry is comprised;
Described power circuit, alternating current sampling circuit, cpu interface circuit, communicating circuit, key circuit, display circuit are connected respectively to described host CPU;
Described power circuit comprises DC24V power module, AC220V power module; Described DC24V power module comprises power supply input over-voltage over-current protection circuit, a DC/DC power-switching circuit; Outside storage battery 24V receives described power supply input over-voltage over-current protection circuit, and described power supply input over-voltage over-current protection circuit is connected to a described DC/DC power-switching circuit; Described AC220V power module comprises AC/DC power-switching circuit, the 2nd DC/DC power-switching circuit; Station service 220V receives described AC/DC power-switching circuit, and described AC/DC power-switching circuit is connected to described 2nd DC/DC power-switching circuit;
Described cpu interface circuit comprises to be opened into circuit, digital output circuit, reset circuit;
Described alternating current sampling circuit comprises machine end AD sampling A/D chip, system AD sampling A/D chip, machine end current sampling circuit, set end voltage sample circuit, system voltage sample circuit, system frequency measurement circuit, machine end frequency measurement circuit;
Described machine end current sampling circuit and set end voltage sample circuit are connected respectively to described machine end AD sampling A/D chip; Described system voltage sample circuit is connected to described system AD sampling A/D chip; Described system frequency measurement circuit and machine end frequency measurement circuit are connected respectively to described phase angle difference decision circuitry; Described phase angle difference decision circuitry is connected to described display circuit;
Described display circuit comprises digital-scroll technique, state instruction, synchronizing instruction.
Described key circuit comprises upper and lower key, display key and arranges key, is mainly used for that parameter is browsed, optimum configurations and the command operation same period.
Described communicating circuit is RS485 interface circuit, as the interface of equipment and external communication.
Machine end AC sampling processing procedure is as follows: on the one hand by described machine end frequency measurement circuit and system frequency measurement circuit, generation synchronous sampling signal is connected to described host CPU, and host CPU calculates machine end and system correlated frequency; Machine end three-phase voltage and machine end three-phase current are respectively by described set end voltage sample circuit, machine end current sampling circuit on the other hand, be connected to described machine end AD sampling A/D chip, described host CPU just controller end AD sampling A/D chip can carry out AC sampling to set end voltage, three-phase current data, can calculate the real-time measurement values of current three-phase voltage, three-phase current through Fourier algorithm.The process of system voltage AC sampling is similar to the process of machine end AC sampling, no longer describes here.
This AC sample system voltage sampling circuit and machine end sample circuit all adopt accurate current mode voltage transformer; the current-limiting resistance that only need change input can change input voltage range; solve and cause transformer saturated because of common transformer overvoltage; output waveform does not linearly measure inaccurate problem; improve and measure precision and stability, thus improve protection act rate accurately.
Refer to shown in Fig. 2, for convenience of description the synchronization function of the utility model device, directly take out the structure division relevant with the same period from Fig. 1 hardware structure diagram, concrete same period, implementation was as follows:
Machine end frequency, system frequency and phase angle difference is calculated by described host CPU by catching mode by described machine end frequency measurement circuit and described system frequency measurement circuit; Set end voltage is by described set end voltage sample circuit, and system voltage, by described system voltage sample circuit, is connected respectively to described machine end AD sampling A/D chip and system AD sampling A/D chip, calculates machine end A phase voltage and system A phase voltage by alternating sampling alogrithm; The machine end synchronizing signal produced by machine end frequency measurement circuit and system frequency measurement circuit holds synchronizing signal after described phase angle difference decision circuitry with netting, to synchronizing indicator light instruction phase angle shift situation.
Software judges that the unit process same period is as follows: the difference first determined between machine end and system frequency is the frequency difference scope set, carry out machine end compare with the phase voltage of system qualified rear just the entering of difference on the frequency, the qualified phase angle difference that finally enters of voltage compare compares, the difference situation of phase angle is exported by the synchronizing instruction in described display circuit, under the condition that phase angle difference is qualified (synchronizing indicator light goes out entirely), digital output circuit described in host CPU controls, carries out simultaneous interconnecting action.
Refer to shown in Fig. 3, for convenience of description the defencive function of the utility model device, directly take out the structure division relevant with protection from Fig. 1 hardware structure diagram, the utility model unit protection function specific implementation is as follows:
By described machine end frequency measurement circuit, calculate machine end frequency by described host CPU by catching mode; Set end voltage and three-phase current, by described set end voltage sample circuit and machine end current sampling circuit, are connected to described machine end AD sampling A/D chip; Three camera end phase voltages and three camera end electric currents are calculated by described host CPU by alternating sampling alogrithm; The machine end frequency, voltage, electric current and the machine end that sets that calculate sampling are overrun, overvoltage, overcurrent parameter compare; when any one condition meets; the operate time of delay adjustments is exported (protection act) by described digital output circuit, and state instruction exports the state of now protection act.
Refer to shown in Fig. 4, wiring outside the utility model integration unit is described in detail
Device external critical piece comprises generator unit F, machine potential transformer PT1, machine end Current Transmit, system voltage instrument transformer PT2 and generator circuit breaker auxiliary magnet DL.
System voltage instrument transformer PT2 and machine potential transformer PT1 Main Function measure and frequency measurement as magnitude of voltage, circuit as voltage measurement is by described machine end alternating current sampling circuit and described system alternating current sampling circuit, calculated through alternating sampling alogrithm by described host CPU, voltage measuring value judges mainly as the overvoltage in defencive function and judges to use with interim voltage difference; Machine end synchronizing signal and system synchronization signal are connected to host CPU respectively by after described machine end frequency measurement circuit and system frequency measurement circuit; host CPU calculates machine end and system frequency by frequency acquisition algorithm, and the frequency measurement of machine end is used as protection and overruns basis for estimation.
The current signal of three-phase current after current transformer (CT) no-load voltage ratio is connected with described host CPU after described machine end alternating current sampling circuit; through the machine end three-phase current that CPU communication method calculates, be mainly used to as unit overcurrent protection basis for estimation.
Generator circuit breaker auxiliary magnet DL is as judging whether generating set is in and the foundation of net state.
When protective condition and the same period, condition met; host CPU send respectively protection output command and the same period output command; Control of Power Plant loop is connected to through digital output circuit; when Control of Power Plant loop send out far away control to order the same period time; the order same period is thrown into circuit to CPU through opening; host CPU carries out judging the same period, whether condition met, and satisfying condition, lower host CPU sends simultaneous interconnecting order.Can also be realized and upper machine communication by communicating circuit, realize remote monitoring.
The utility model certainty of measurement is high, arranges Control protection action more accurate.The machine end AD acquisition chip of alternating current sampling circuit and system AD acquisition chip, all adopt 16 special A/D chip, Acquisition Circuit potential and current transformers all adopts the device that precision is higher, makes acquisition precision higher, and equipment control action is accurate.Circuit is simple, realizes equipment automatization cost low.In circuit design, some main circuit all adopt shared design, make hardware circuit fairly simple, reduce the overall cost of equipment.Communication interface is convenient, control is flexible.The utility model adopts RS485 interface mode and outside to carry out communication, adopts MODBUS communication protocol, directly can read all measurement parameters and parameters data, can directly be controlled equipment by parameters.Functional integration is higher, safeguards easy for installation.The utility model volume is little, and the simple installation and maintenance of wiring is convenient, and an equipment just can realize generator unit simultaneous interconnecting and generating set defencive function.
Above-described embodiment and graphic and non-limiting product form of the present utility model and style, any person of an ordinary skill in the technical field, to its suitable change done or modification, all should be considered as not departing from patent category of the present utility model.
Claims (2)
1., based on the hydraulic generator same period and the protection integration unit of AC sampling, it is characterized in that: comprise power circuit, alternating current sampling circuit, host CPU, cpu interface circuit, communicating circuit, key circuit, display circuit, phase angle difference decision circuitry;
Described power circuit, alternating current sampling circuit, cpu interface circuit, communicating circuit, key circuit, display circuit are connected respectively to described host CPU;
Described power circuit comprises DC24V power module, AC220V power module; Described DC24V power module comprises power supply input over-voltage over-current protection circuit, a DC/DC power-switching circuit; Outside storage battery 24V receives described power supply input over-voltage over-current protection circuit, and described power supply input over-voltage over-current protection circuit is connected to a described DC/DC power-switching circuit; Described AC220V power module comprises AC/DC power-switching circuit, the 2nd DC/DC power-switching circuit; Station service 220V receives described AC/DC power-switching circuit, and described AC/DC power-switching circuit is connected to described 2nd DC/DC power-switching circuit;
Described cpu interface circuit comprises to be opened into circuit, digital output circuit, reset circuit;
Described alternating current sampling circuit comprises machine end AD sampling A/D chip, system AD sampling A/D chip, machine end current sampling circuit, set end voltage sample circuit, system voltage sample circuit, system frequency measurement circuit, machine end frequency measurement circuit;
Described machine end current sampling circuit and set end voltage sample circuit are connected respectively to described machine end AD sampling A/D chip; Described system voltage sample circuit is connected to described system AD sampling A/D chip; Described system frequency measurement circuit and machine end frequency measurement circuit are connected respectively to described phase angle difference decision circuitry; Described phase angle difference decision circuitry is connected to described display circuit;
Described display circuit comprises digital-scroll technique, state instruction, synchronizing instruction.
2., as claimed in claim 1 based on the hydraulic generator same period and the protection integration unit of AC sampling, it is characterized in that: described communicating circuit is RS485 interface circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420528618.0U CN204103457U (en) | 2014-09-15 | 2014-09-15 | Based on the hydraulic generator same period and the protection integration unit of AC sampling |
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| CN201420528618.0U CN204103457U (en) | 2014-09-15 | 2014-09-15 | Based on the hydraulic generator same period and the protection integration unit of AC sampling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019155A (en) * | 2016-07-08 | 2016-10-12 | 清华大学 | Phase comparison type differential protection method and system based on generator branch current |
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2014
- 2014-09-15 CN CN201420528618.0U patent/CN204103457U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019155A (en) * | 2016-07-08 | 2016-10-12 | 清华大学 | Phase comparison type differential protection method and system based on generator branch current |
| CN106019155B (en) * | 2016-07-08 | 2019-02-05 | 清华大学 | Phase comparison expression differential protecting method and system based on generator branch current |
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