CN104330681A - Device for detecting AC entering DC bus in DC power system - Google Patents
Device for detecting AC entering DC bus in DC power system Download PDFInfo
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- CN104330681A CN104330681A CN201310309180.7A CN201310309180A CN104330681A CN 104330681 A CN104330681 A CN 104330681A CN 201310309180 A CN201310309180 A CN 201310309180A CN 104330681 A CN104330681 A CN 104330681A
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Abstract
The invention relates to a device for detecting an AC entering a DC bus in a DC power system. The device comprises a voltage division sampling module, an AC extraction amplification module and an ADC conversion module. The first end of the voltage division sampling module is connected with a switch-on bus plus or a control bus plus; the second of the voltage division sampling module is connected with a switch-on bus minus and/or a control bus minus; the third end of the voltage division sampling module is grounded; the sampling output end of the voltage division sampling module outputs sampling signals comprising AC components; and the voltage division sampling module comprises a first balance bridge resistor and a second balance bridge resistor. The detection device can fully cover AC entering between HM+, HM-,KM+ and KM- and the ground; and the voltage division sampling module only comprises three balance bridge resistors used in the insulation detection device, so that all AC signals can be sampled at a single bridge arm, and meanwhile, the requirement for device parameters is reduced.
Description
Technical field
The present invention relates to straight-flow system monitoring field, more particularly, relate to DC bus in a kind of DC power system and scurry into the pick-up unit of interchange.
Background technology
In electric system, direct supply as main Control protection ring current, due to cable branch and wiring outlet more, often there will be because mis-wired, touch by mistake, fault that DC loop is scurried in degradation causes under device performance interchange.When DC loop is scurried in interchange, very easily cause the misoperation of protective relay, existing more generating plant, transformer station quoted this phenomenon of the failure in recent years.
In power plant and transformer station, because alternating current is generally direct or connect the earth by arc suppression coil, therefore exchange the approach of DC loop scurried in DC power system, mainly contain two kinds.One scurries between direct current positive bus and ground, and another kind scurries between direct current negative busbar and ground.And in most systems, DC bus is divided into again closing bus bar HM and control bus KM, both are contacted by silicon chain.As shown in Figure 1, the positive HM+ of closing bus bar and the positive KM+ of control bus is through positive bus-bar stake resistance R1 ground connection, and closing bus bar bears HM-and control bus bears KM-through negative busbar stake resistance R2 ground connection.Therefore exchange the mode scurried into just to be divided into from scurrying between HM+ and the earth, from scurrying between KM+ and the earth, scurrying between HM-/KM-and the earth, distinguishing as shown in Figure 2, Figure 3, Figure 4.
Chinese patent CN201120537379.1 discloses and a kind ofly monitors the device that alternating current seals in straight-flow system, described device comprises alternating current quantity sampling circuit, sampled signal modulate circuit, AD converter and processor, has possessed basic interchange and has scurried into detection and alarm function.Its alternating current quantity sampling circuit comprises resistance R1-R4, electric capacity C1, and wherein resistance R1 and R2 is connected between KM+ and KM-, resistance R3, R4 and electric capacity C1 be connected between KM-and ground.Therefore, this monitoring alternating current seals in the device not only complex circuit designs of straight-flow system, and only can to KM+ and KM-over the ground between scurry into interchange and detect, sensing range can not contain comprehensively often occur in electric system DC loop HM+, scurry between KM+, HM-/KM-with the earth and exchange.
Summary of the invention
The technical problem to be solved in the present invention is, the pick-up unit of interchange is scurried into for DC bus in the DC power system of prior art, sensing range can not to contain in electric system comprehensively often occur DC loop HM+, scurry into the defect exchanged between KM+, HM-/KM-with the earth, there is provided a kind of structure simple, and can cover often occur in electric system DC loop HM+, scurry into DC bus in the DC power system exchanged between KM+, HM-/KM-with the earth and scurry into the pick-up unit of interchange.
The technical solution adopted for the present invention to solve the technical problems is: construct DC bus in a kind of DC power system and scurry into the pick-up unit of interchange, comprising:
Dividing potential drop sampling module, the first end of described dividing potential drop sampling module connect closing bus bar just or control bus just, second end connection closing bus bar of described dividing potential drop sampling module is negative and/or control bus is negative, 3rd termination the earth of described dividing potential drop sampling module, the sampled output output packet of described dividing potential drop sampling module contains the sampled signal of alternating component, wherein said dividing potential drop sampling module comprises the first balance bridge resistance and the second balance bridge resistance, and the tie point of described first balance bridge resistance and the second balance bridge resistance is the 3rd end of described dividing potential drop sampling module; Described first balance bridge resistance is the first balance resistance, and described second balance bridge resistance is made up of the second balance resistance and the 3rd balance resistance;
Exchange and extract amplification module, for extracting alternating component in described sampled signal to generate ac sampling signal and to amplify described ac sampling signal;
ADC modular converter, for converting the ac sampling signal of described amplification to digital signal.
In DC power system of the present invention, DC bus is scurried in the pick-up unit of interchange, and the output of described dividing potential drop sampling module is the voltage output at the two ends of described 3rd balance resistance.
In DC power system of the present invention, DC bus is scurried in the pick-up unit of interchange, the first end of described first balance resistance connect described control bus just with the negative electrode of silicon chain, the anode of described silicon chain is just connecting described closing bus bar; Second end of described first balance resistance connects the first end of the earth and the second balance resistance; Second end of described second balance resistance connects described closing bus bar through described 3rd balance resistance and bears with described control bus negative.
In DC power system of the present invention, DC bus is scurried in the pick-up unit of interchange, the first end of described first balance resistance connects the negative and described control bus of described closing bus bar and bears, the second end downlink connection the earth of described first balance resistance and the first end of described second balance resistance; Second end of described second balance resistance through described 3rd balance resistance connect described closing bus bar just with the anode of silicon chain, the negative electrode of described silicon chain is just connecting described control bus.
5, in DC power system according to claim 2, DC bus scurries into the pick-up unit of interchange, it is characterized in that, the first end of described first balance resistance connects the negative and described control bus of described closing bus bar and bears, and the second end of described first balance resistance connects the first end of the earth and described second balance resistance; Second end of described second balance resistance through described 3rd balance resistance connect described control bus just with the negative electrode of silicon chain, the anode of described silicon chain is just connecting described closing bus bar.
In DC power system of the present invention, DC bus is scurried in the pick-up unit of interchange, the first end of described first balance resistance connect described closing bus bar just with the anode of silicon chain, the negative electrode of described silicon chain is just connecting described control bus; Second end of described first balance resistance connects the first end of the earth and the second balance resistance; Second end of described second balance resistance connects described closing bus bar through described 3rd balance resistance and bears with described control bus negative.
In DC power system of the present invention, DC bus is scurried in the pick-up unit of interchange, and described in the first end downlink connection of described first balance resistance, closing bus bar just, and the second end of described first balance resistance connects the first end of the earth and the second balance resistance; Second end of described second balance resistance connects described closing bus bar through described 3rd balance resistance and bears.
In DC power system of the present invention, DC bus is scurried in the pick-up unit of interchange, and described in the first end downlink connection of described first balance resistance, control bus just, and the second end of described first balance resistance connects the first end of the earth and the second balance resistance; Second end of described second balance resistance connects described control bus through described 3rd balance resistance and bears.
In DC power system of the present invention, DC bus is scurried in the pick-up unit of interchange, described interchange is extracted amplification module and is comprised capacitance, reference resistance and operational amplifier, the first end of described capacitance connects the described sampled output of described dividing potential drop sampling module, second end of described capacitance connects the normal phase input end of described operational amplifier, the inverting input of described operational amplifier connects the output terminal of described operational amplifier, the first end of described reference resistance connects the normal phase input end of described operational amplifier, second end of described reference resistance connects sampled signal ground.
In DC power system of the present invention, DC bus is scurried in the pick-up unit of interchange, described interchange is extracted amplification module and is also comprised filter capacitor and filter resistance, and the first end of described filter capacitor connects described the second end connection sampled signal ground exchanging the output terminal extracting amplification module, described filter capacitor; Described filter resistance connects between the output terminal of described operational amplifier and the output terminal of described interchange extraction amplification module.
In DC power system of the present invention, DC bus is scurried in the pick-up unit of interchange, described interchange is extracted amplification module and is also comprised filter capacitor and filter resistance, and the first end of described filter capacitor connects described the second end connection sampled signal ground exchanging the output terminal extracting amplification module, described filter capacitor; Described filter resistance connects between the output terminal of described operational amplifier and the output terminal of described interchange extraction amplification module.
In DC power system of the present invention, DC bus is scurried in the pick-up unit of interchange, and the pick-up unit that in described DC power system, DC bus scurries into interchange also comprises the processing module for receiving, reporting described digital signal alarm.
Implement DC bus in DC power system of the present invention and scurry into the pick-up unit of interchange, HM+, HM-, KM+, KM-interchange to the earth can be covered scurry into comprehensively, and its dividing potential drop sampling module only comprises three the balance bridge resistance adopted in insulation detection device, its circuit structure is simple, can to sample all AC signal at single brachium pontis, reduce the requirement to device parameters simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the closing bus bar of prior art and the connection diagram of control bus;
Fig. 2 exchanges the schematic diagram from scurrying between HM+ and the earth;
Fig. 3 exchanges the schematic diagram from scurrying between KM+ and the earth
Fig. 4 exchanges the schematic diagram from scurrying between HM-/KM-and the earth;
Fig. 5 is the circuit theory diagrams that in the DC power system of prior art, DC bus scurries into the pick-up unit of interchange;
Fig. 6 is the theory diagram that in DC power system of the present invention, DC bus scurries into the pick-up unit of interchange;
Fig. 7 is the circuit theory diagrams of the first embodiment of dividing potential drop sampling module of the present invention;
Fig. 8 a is the circuit diagram of the dividing potential drop sampling module shown in Fig. 7 when KM+ is directly scurried in interchange;
Fig. 8 b is the equivalent model figure of the dividing potential drop sampling module shown in Fig. 7 when KM+ is directly scurried in interchange;
Fig. 8 c is that the dividing potential drop sampling module shown in Fig. 7 is directly scurried into KM+ in interchange and disconnects the equivalent circuit diagram of silicon chain;
Fig. 9 a is the circuit diagram of the dividing potential drop sampling module shown in Fig. 7 when KM-is directly scurried in interchange;
Fig. 9 b is the equivalent model figure of the dividing potential drop sampling module shown in Fig. 7 when KM-is directly scurried in interchange;
Fig. 9 c is that the dividing potential drop sampling module shown in Fig. 7 is directly scurried into KM-in interchange and disconnects the equivalent circuit diagram of silicon chain;
Figure 10 a is the circuit diagram of the dividing potential drop sampling module shown in Fig. 7 when HM+ is directly scurried in interchange;
Figure 10 b is the equivalent model figure of the dividing potential drop sampling module shown in Fig. 7 when HM+ is directly scurried in interchange;
Figure 11 is the circuit theory diagrams exchanging the first embodiment extracting amplification module of the present invention;
Figure 12 is the circuit theory diagrams that in DC power system of the present invention, DC bus scurries into the first embodiment of the pick-up unit of interchange;
Figure 13 is the circuit theory diagrams that in DC power system of the present invention, DC bus scurries into the second embodiment of the pick-up unit of interchange;
Figure 14 is the circuit theory diagrams that in DC power system of the present invention, DC bus scurries into the 3rd embodiment of the pick-up unit of interchange;
Figure 15 is the circuit theory diagrams that in DC power system of the present invention, DC bus scurries into the 4th embodiment of the pick-up unit of interchange.
Figure 16 is the circuit theory diagrams that in DC power system of the present invention, DC bus scurries into the 5th embodiment of the pick-up unit of interchange.
Embodiment
As shown in Figure 6, the pick-up unit 100 that DC bus scurries into interchange in DC power system of the present invention comprises dividing potential drop sampling module 110, exchanges and extract amplification module 120 and ADC modular converter 130.As shown in Figure 6, the first end of described dividing potential drop sampling module 110 connects the positive HM+ of closing bus bar or the positive KM+ of control bus.Second end connection closing bus bar of described dividing potential drop sampling module 110 bears HM-and control bus bears KM-.3rd end ground connection of described dividing potential drop sampling module 110.Dividing potential drop sampling module 110 couples of positive HM+ of closing bus bar, the positive KM+ of control bus, closing bus bar are born HM-and control bus and are born the voltage of KM-to the earth and carry out dividing potential drop and sampling thus, and last output packet is containing the sampled signal of alternating component.Exchange extraction amplification module 120 to be connected with the sampled output of described dividing potential drop sampling module 110, thus receive this sampled signal, and the alternating component extracted in described sampled signal is to generate ac sampling signal and to amplify described ac sampling signal.Described ADC modular converter 130 connects described interchange and extracts amplification module 120 thus receive the ac sampling signal amplified, and converts thereof into digital signal.
At this, described dividing potential drop sampling module 100 comprises the first balance bridge resistance and the second balance bridge resistance.The tie point ground connection of described first balance bridge resistance and the second balance bridge resistance; Described first balance bridge resistance is the first balance resistance, and described second balance bridge is made up of the second balance resistance and the 3rd balance resistance.In the present invention, the resistance value of described first balance bridge resistance is at or about the resistance value of described second balance bridge resistance.Those skilled in the art know, the first balance bridge resistance of the insulation detection device that dividing potential drop sampling module 100 of the present invention can adopt existing DC power system to adopt and the second balance bridge resistance build.
Described interchange is extracted amplification module 120 and existing capacitance and amplifying circuit can be adopted to build, and also can adopt other circuits built as known in the art.
Therefore, implement DC bus in DC power system of the present invention and scurry into the pick-up unit of interchange, HM+, HM-, KM+, KM-interchange to the earth can be covered comprehensively and scurry into,
Fig. 7 is the circuit theory diagrams of the first embodiment of dividing potential drop sampling module of the present invention.As shown in Figure 7, described dividing potential drop sampling module comprises the first balance bridge resistance and the second balance bridge resistance.Described first balance bridge resistance is resistance R1, and described second balance bridge is made up of resistance R2 and R2ac.Wherein the resistance value of resistance R1 approximates the resistance value sum of resistance R2 and R2ac.As shown in Figure 7, the first end of resistance R1 connects the negative electrode of the positive KM+ of described control bus and silicon chain D1.The anode of described silicon chain D1 connects the positive HM+ of described closing bus bar.Second end of resistance R1 connects the first end of the earth and resistance R2.Second end of described resistance R2 also connects described closing bus bar through described resistance R2ac and bears HM-and control bus bears KM-.Thus, sampled signal can be born HM-and control bus from the sampled point at resistance R2ac two ends, closing bus bar and bears KM-and obtain.
Below, by composition graphs 8a-c, the dividing potential drop sampling module shown in 9a-c, 10a-b key diagram 7 just can adopt HM+, KM+, HM-/KM-alternating component relative to the earth on the sampled point of resistance R2ac.
(1) interchange directly scurries into KM+
As shown in Figure 8 a, the voltage between positive and negative HM+ and HM-of closing bus bar is V1, and exchanging that to scurry into voltage be V2, R2+R2ac is the resistance value of KM-to balance bridge resistance R2 and R2ac of the earth, and R1 is the resistance value of KM+ to the balance resistance R1 of the earth, R1=R2+R2ac.In the present embodiment, assuming that the resistance value of the control bus external load RL of this DC power system is RL.When RL meets certain condition, silicon chain D1 equivalence becomes a constant pressure source, supposes that the pressure drop at its two ends is V3.Now, by the circuit equivalent process shown in Fig. 8 a, equivalent electrical circuit is as shown in Figure 8 b obtained.Now utilize superposition principle, can obtain the voltage at resistance R2ac two ends, the sampled signal Vsample containing alternating component that namely dividing potential drop sampling module exports is:
VSample=R2ac（V1-V3+V2）/（R2+R2ac）。
Wherein contain the alternating voltage V2 of KM+ to the earth.
At this, when RL satisfies condition RL< (V1-V3) * (R2+R2ac)/(V3-V1-V2), silicon chain D1 side as constant pressure source, can derive as follows.As shown in Figure 8 c, disconnected at silicon chain two ends, when open-circuit voltage UAB is greater than silicon chain conduction voltage drop, the permanent conducting of silicon chain, so at this moment can become a constant pressure source the equivalence of silicon chain.Superposition principle is used to obtain out the open-circuit voltage at AB two ends,
UAB=V1+V2*RL/（RL+R2+R2ac）
As UAB>V3, the conducting of silicon chain, can be equivalent to voltage source.Therefore RL is less than the value calculated by said method.In actual applications, load RL can meet above-mentioned calculating income value substantially.In the present embodiment, for 220V straight-flow system, balance bridge resistance selection R2+R2ac=R1=100k, as long as the value of RL is less than 140k just can meet above-mentioned equivalence, and the RL in real system is all far smaller than this value, therefore above-mentioned equivalence can generally be applied.
(2) when KM-is directly scurried in interchange
Now, similarly silicon chain is equivalent to voltage source, the sampled signal Vsample containing alternating component that dividing potential drop sampling module exports can be solved,
VSample=R2ac*V2/（R2+R2ac），
The alternating voltage V2 of KM-to the earth is included in VSample
Calculate silicon chain two ends open-circuit voltage equally: UAB=V1+V2*RL/(RL+R2+R2ac)
The equivalence of silicon chain can be become constant pressure source as UAB>V3, as seen when KM-scurries into interchange, be identical when RL and the KM+ meeting equivalent condition scurries into interchange.
(3) when HM+ is directly scurried in interchange
Because KM-and HM-is electrical connection, just no longer consider that HM-scurries into the situation of interchange, only considers that HM+ scurries into interchange here.HM+ scurries into the schematic diagram of interchange as shown in Figure 10 a, silicon chain is equivalent to the constant pressure source process that voltage is V3 equally here, equivalent circuit diagram is if Figure 10 b is according to the circuit after equivalence, R2ac both end voltage can be obtained by superposition theorem, the i.e. sampled signal Vsample containing alternating component of dividing potential drop sampling module output
VSample=V1+V2*RL/（RL+R2+R2ac）
By calculating the open-circuit voltage UAB at silicon chain two ends, UAB>V3 need be made obtain the RL meeting equivalent condition equally.Calculate now UAB=V1*R1/(R1+RL)+V2*RL/(RL+R2+R2ac), when the RL value that this formula is calculated meets UAB>V3, equivalent model is set up.
From analyzing above, the sampled signal obtained from the sampled point of R2ac is all containing common alternating component V2*RL/(RL+R2+R2ac), as long as so carry out, every straight filtering, ac signal acquisition to be arrived to sampled signal.In actual applications, as long as select suitable balance bridge resistance value, the KM load RL in system all can meet the demand of foregoing circuit equivalent model.
Figure 11 is the circuit theory diagrams exchanging the first embodiment extracting amplification module of the present invention.As shown in figure 11, described interchange extraction amplification module comprises capacitance C1, reference resistance R5, operational amplifier U1, filter resistance R4 and filter capacitor C2.As shown in figure 11, the first end of described capacitance C1 connects the described sampled output of described dividing potential drop sampling module.Second end of described capacitance C1 connects the normal phase input end of described operational amplifier U1.The inverting input of described operational amplifier U1 connects the output terminal of described operational amplifier U1.The first end of described reference resistance R5 connects the normal phase input end of described operational amplifier U1, and second end of described reference resistance R5 connects sampled signal ground GND.The first end of described filter capacitor C2 connects the described output terminal, the second end with the connecting sampled signal GND that exchange extraction amplification module.Described filter resistance R4 connects between the output terminal of described operational amplifier U1 and the output terminal of described interchange extraction amplification module.
As shown in figure 11, capacitance C1 is used for filtering from the flip-flop the sampled signal that dividing potential drop sampling module obtains.Operational amplifier U1 as voltage follower, strengthens the load capacity of Sample AC signal at this.Filter resistance R4 and filter capacitor C2 forms RC filtering link, leaches the high frequency noise in Sample AC signal.
Circuit working process is as follows: the sampled signal from dividing potential drop sampling module, and through capacitance filtering, filtering flip-flop, extracts AC signal; AC signal outputs to ADC modular converter after voltage follower and RC filtering circuit.After capacitance C1 has been placed on dividing potential drop sampling module in this partial circuit, greatly reduce the requirement of withstand voltage of electric capacity, the capacitance parameter selected in this circuit is 25V/1uF.
Figure 12 is the circuit theory diagrams that in DC power system of the present invention, DC bus scurries into the first embodiment of the pick-up unit of interchange.As shown in figure 12, the pick-up unit that in DC power system of the present invention, DC bus scurries into interchange comprises resistance R1, resistance R2 and R2ac, capacitance, operational amplifier module U11, ADC modular converter 130, processing module 140.Wherein the resistance value of resistance R1 approximates the resistance value sum of resistance R2 and R2ac.As shown in figure 12, the first end of resistance R1 connects the anode of the positive HM+ of described closing bus bar and thyristor diode D1.The negative electrode of described thyristor diode D1 connects the positive KM+ of described control bus.Second end of resistance R1 connects the first end of the earth and resistance R2.Second end of described resistance R2 connects described closing bus bar through described resistance R2ac and bears HM-and control bus bears KM-, and described sampled signal is R2ac both end voltage.The sampled point of sampled signal through resistance R2ac place obtained is supplied to capacitance.Capacitance filtering from the flip-flop the sampled signal that dividing potential drop sampling module obtains, then provides it to operational amplifier.Operational amplifier module U11 as voltage follower, strengthens the load capacity of Sample AC signal at this.Those skilled in the art know, operational amplifier module U11 can comprise one or several operational amplifier.The AC signal exported is supplied to ADC modular converter 130, and it carries out digitized processing to the AC signal collected, and makes AC signal become the accessible data of processor module 140.Processor module 140 records the digital signal obtained, reports and alarm.In one embodiment of the invention, this processor module 140 is DSP TMS320F28033PNT.
Figure 13 is the circuit theory diagrams that in DC power system of the present invention, DC bus scurries into the second embodiment of the pick-up unit of interchange.As shown in figure 13, the pick-up unit that in DC power system of the present invention, DC bus scurries into interchange comprises resistance R1, resistance R2 and R2ac, capacitance, operational amplifier module U11, ADC modular converter 130, processing module 140.Wherein the resistance value of resistance R1 approximates the resistance value sum of resistance R2 and R2ac.The difference of the embodiment shown in the embodiment shown in Figure 13 and Figure 12 is the annexation of resistance R1, resistance R2 and R2ac and the positive and negative HM+/HM-of closing bus bar and the positive and negative KM+/KM-of control bus.As shown in figure 13, the first end of resistance R1 connects the negative and described control bus of described closing bus bar and bears HM-/KM-, and second end of resistance R1 connects the first end of the earth and resistance R2.Second end of described resistance R2 connects the anode of the positive HM+ of described closing bus bar and silicon chain D1 through resistance R2ac, the two ends of described resistance R2ac are the output of described dividing potential drop sampling element.The negative electrode of described silicon chain D1 connects the positive KM+ of described control bus.The sampled signal obtained is supplied to capacitance through resistance R2ac two ends.Capacitance filtering from the flip-flop the sampled signal that dividing potential drop sampling module obtains, then provides it to operational amplifier.Operational amplifier module U11 as voltage follower, strengthens the load capacity of Sample AC signal at this.The AC signal exported is supplied to ADC modular converter 130, and it carries out digitized processing to the AC signal collected, and makes AC signal become the accessible data of processor module 140.Processor module 140 records the digital signal obtained, reports and alarm.In one embodiment of the invention, this processor module 140 is DSP TMS320F28033PNT.
Figure 14 is the circuit theory diagrams that in DC power system of the present invention, DC bus scurries into the 3rd embodiment of the pick-up unit of interchange.As shown in figure 14, the pick-up unit that in DC power system of the present invention, DC bus scurries into interchange comprises resistance R1, resistance R2 and R2ac, capacitance, operational amplifier module U11, ADC modular converter 130, processing module 140.Wherein the resistance value of resistance R1 approximates the resistance value sum of resistance R2 and R2ac.The difference of the embodiment shown in the embodiment shown in Figure 14 and Figure 12 is the annexation of resistance R1, resistance R2 and R2ac and the positive and negative HM+/HM-of closing bus bar and the positive and negative KM+/KM-of control bus.As shown in figure 14, the first end of resistance R1 connects the negative and described control bus of described closing bus bar and bears HM-/KM-, and second end of resistance R1 connects the first end of the earth and resistance R2.Second end of described resistance R2 is the described sampled output of described dividing potential drop sampling module and connects the negative electrode of the positive KM+ of described control bus and silicon chain D1 through resistance R2ac.The anode of described silicon chain D1 connects the positive KM+ of described control bus.The sampled point of sampled signal through resistance R2ac place obtained is supplied to capacitance.Capacitance filtering from the flip-flop the sampled signal that dividing potential drop sampling module obtains, then provides it to operational amplifier.Operational amplifier module U11 as voltage follower, strengthens the load capacity of Sample AC signal at this.The AC signal exported is supplied to ADC modular converter 130, and it carries out digitized processing to the AC signal collected, and makes AC signal become the accessible data of processor module 140.Processor module 140 records the digital signal obtained, reports and alarm.In one embodiment of the invention, this processor module 140 is DSP TMS320F28033PNT.
Figure 15 is the circuit theory diagrams that in DC power system of the present invention, DC bus scurries into the 4th embodiment of the pick-up unit of interchange.As shown in figure 15, the pick-up unit that in DC power system of the present invention, DC bus scurries into interchange comprises resistance R1, resistance R2 and R2ac, capacitance, operational amplifier module U11, ADC modular converter 130, processing module 140.Wherein the resistance value of resistance R1 approximates the resistance value sum of resistance R2 and R2ac.The difference of the embodiment shown in Figure 15 and Figure 12-14 is, the pick-up unit shown in Figure 15 is applicable to the DC power system only comprising the positive and negative HM+/HM-of closing bus bar.As shown in figure 15, the positive HM+ of closing bus bar described in the first end downlink connection of resistance R1.Second end of resistance R1 connects the first end of the earth and resistance R2.Second end of resistance R2 connects described closing bus bar through resistance R2ac and bears HM-.
Figure 16 is the circuit theory diagrams that in DC power system of the present invention, DC bus scurries into the 5th embodiment of the pick-up unit of interchange.As shown in figure 16, the pick-up unit that in DC power system of the present invention, DC bus scurries into interchange comprises resistance R1, resistance R2 and R2ac, capacitance, operational amplifier module U11, ADC modular converter 130, processing module 140.Wherein the resistance value of resistance R1 approximates the resistance value sum of resistance R2 and R2ac.The difference of the embodiment shown in Figure 16 and Figure 12-14 is, the pick-up unit shown in Figure 16 is applicable to the DC power system only comprising the positive and negative KM+/KM-of control bus.As shown in figure 16, the positive KM+ of control bus described in the first end downlink connection of resistance R1.Second end of resistance R1 connects the first end of the earth and resistance R2.Second end of resistance R2 connects described control bus through resistance R2ac and bears KM-.
Those skilled in the art know, except the embodiment that Figure 12-16 illustrates, interchange shown in dividing potential drop sampling module shown in Fig. 7, Figure 11 can be extracted amplification module 120 and be combined by those skilled in the art, or the embodiment shown in itself and Figure 12-14 is carried out combining, revise thus obtain other embodiment.And the description that the principle of work of these embodiments and process can be carried out with reference to Fig. 8 a-10b.
In addition, implement DC bus in DC power system of the present invention and scurry into the pick-up unit of interchange, HM+, HM-, KM+, KM-interchange to the earth can be covered scurry into comprehensively, and its dividing potential drop sampling module only comprises three the balance bridge resistance adopted in insulation detection device, its circuit structure is simple, can to sample all AC signal at single brachium pontis, reduce the requirement to device parameters simultaneously.
Although the present invention is described by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, various conversion can also be carried out and be equal to substituting to the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole embodiments fallen within the scope of the claims in the present invention.
Claims (11)
1. in DC power system, DC bus scurries into a pick-up unit for interchange, it is characterized in that, comprising:
Dividing potential drop sampling module, the first end of described dividing potential drop sampling module connect closing bus bar just or control bus just, second end connection closing bus bar of described dividing potential drop sampling module is negative and/or control bus is negative, 3rd termination the earth of described dividing potential drop sampling module, the sampled output output packet of described dividing potential drop sampling module contains the sampled signal of alternating component, wherein said dividing potential drop sampling module comprises the first balance bridge resistance and the second balance bridge resistance, and the tie point of described first balance bridge resistance and the second balance bridge resistance is the 3rd end of described dividing potential drop sampling module; Described first balance bridge resistance is the first balance resistance, and described second balance bridge resistance is made up of the second balance resistance and the 3rd balance resistance;
Exchange and extract amplification module, for extracting alternating component in described sampled signal to generate ac sampling signal and to amplify described ac sampling signal;
ADC modular converter, for converting the ac sampling signal of described amplification to digital signal.
2. in DC power system according to claim 1, DC bus scurries into the pick-up unit of interchange, and the output of described dividing potential drop sampling module is the voltage output at the two ends of described 3rd balance resistance.
3. in DC power system according to claim 2, DC bus scurries into the pick-up unit of interchange, it is characterized in that, the first end of described first balance resistance connect described control bus just with the negative electrode of silicon chain, the anode of described silicon chain is just connecting described closing bus bar; Second end of described first balance resistance connects the first end of the earth and the second balance resistance; Second end of described second balance resistance connects described closing bus bar through described 3rd balance resistance and bears with described control bus negative.
4. in DC power system according to claim 2, DC bus scurries into the pick-up unit of interchange, it is characterized in that, the first end of described first balance resistance connects the negative and described control bus of described closing bus bar and bears, the second end downlink connection the earth of described first balance resistance and the first end of described second balance resistance; Second end of described second balance resistance through described 3rd balance resistance connect described closing bus bar just with the anode of silicon chain, the negative electrode of described silicon chain is just connecting described control bus.
5. in DC power system according to claim 2, DC bus scurries into the pick-up unit of interchange, it is characterized in that, the first end of described first balance resistance connects the negative and described control bus of described closing bus bar and bears, and the second end of described first balance resistance connects the first end of the earth and described second balance resistance; Second end of described second balance resistance through described 3rd balance resistance connect described control bus just with the negative electrode of silicon chain, the anode of described silicon chain is just connecting described closing bus bar.
6. in DC power system according to claim 2, DC bus scurries into the pick-up unit of interchange, it is characterized in that, the first end of described first balance resistance connect described closing bus bar just with the anode of silicon chain, the negative electrode of described silicon chain is just connecting described control bus; Second end of described first balance resistance connects the first end of the earth and the second balance resistance; Second end of described second balance resistance connects described closing bus bar through described 3rd balance resistance and bears with described control bus negative.
7. in DC power system according to claim 2, DC bus scurries into the pick-up unit of interchange, it is characterized in that, described in the first end downlink connection of described first balance resistance, closing bus bar just, and the second end of described first balance resistance connects the first end of the earth and the second balance resistance; Second end of described second balance resistance connects described closing bus bar through described 3rd balance resistance and bears.
8. in DC power system according to claim 2, DC bus scurries into the pick-up unit of interchange, it is characterized in that, described in the first end downlink connection of described first balance resistance, control bus just, and the second end of described first balance resistance connects the first end of the earth and the second balance resistance; Second end of described second balance resistance connects described control bus through described 3rd balance resistance and bears.
9. scurry into the pick-up unit of interchange according to DC bus in the DC power system in claim 1-8 described in any one claim, it is characterized in that, described interchange is extracted amplification module and is comprised capacitance, reference resistance and operational amplifier, the first end of described capacitance connects the described sampled output of described dividing potential drop sampling module, second end of described capacitance connects the normal phase input end of described operational amplifier, the inverting input of described operational amplifier connects the output terminal of described operational amplifier, the first end of described reference resistance connects the normal phase input end of described operational amplifier, second end of described reference resistance connects sampled signal ground.
10. in DC power system according to claim 9, DC bus scurries into the pick-up unit of interchange, it is characterized in that, described interchange is extracted amplification module and is also comprised filter capacitor and filter resistance, and the first end of described filter capacitor connects described the second end connection sampled signal ground exchanging the output terminal extracting amplification module, described filter capacitor; Described filter resistance connects between the output terminal of described operational amplifier and the output terminal of described interchange extraction amplification module.
In 11. DC power system according to claim 10, DC bus scurries into the pick-up unit of interchange, it is characterized in that, the pick-up unit that in described DC power system, DC bus scurries into interchange also comprises the processing module for receiving, reporting described digital signal alarm.
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| CN105425068A (en) * | 2015-11-21 | 2016-03-23 | 国网宁夏电力公司宁东供电公司 | Substation direct-current bus alternating-current voltage serial-in monitoring device |
| CN106786467A (en) * | 2017-02-20 | 2017-05-31 | 广西电网有限责任公司柳州供电局 | Fault warning and device for preventing unwanted operation are scurried into one kind exchange |
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| CN105140882A (en) * | 2015-08-27 | 2015-12-09 | 国网上海市电力公司 | Substation direct current system alternating current intrusion protection device |
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| CN106786467B (en) * | 2017-02-20 | 2018-11-20 | 广西电网有限责任公司柳州供电局 | Fault warning and device for preventing unwanted operation are scurried into a kind of exchange |
| CN107677906A (en) * | 2017-09-30 | 2018-02-09 | 江苏方天电力技术有限公司 | A kind of transformer station direct current system failure detector circuit and inspection method |
| CN107677906B (en) * | 2017-09-30 | 2020-06-09 | 江苏方天电力技术有限公司 | Transformer substation direct current system fault detection circuit and detection method |
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| CN107741573B (en) * | 2017-10-24 | 2019-12-13 | 国网山西省电力公司电力科学研究院 | Applying device and applying method for fleeing-in alternating current in direct-current power supply system of transformer substation |
| CN110579647A (en) * | 2019-07-26 | 2019-12-17 | 中国南方电网有限责任公司超高压输电公司梧州局 | Control protection system with insulation monitoring and active prevention functions |
| CN110579647B (en) * | 2019-07-26 | 2020-10-09 | 中国南方电网有限责任公司超高压输电公司梧州局 | Control protection system with insulation monitoring and active prevention functions |
| CN111193383A (en) * | 2020-01-22 | 2020-05-22 | 维沃移动通信有限公司 | Power control circuit and electronic device |
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