CN104422897A - Method and device for detecting direct current crossing in double direct-current power source systems - Google Patents
Method and device for detecting direct current crossing in double direct-current power source systems Download PDFInfo
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- CN104422897A CN104422897A CN201310374325.1A CN201310374325A CN104422897A CN 104422897 A CN104422897 A CN 104422897A CN 201310374325 A CN201310374325 A CN 201310374325A CN 104422897 A CN104422897 A CN 104422897A
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Abstract
The invention relates to a method and device for detecting direct current crossing in double direct-current power source systems. The method includes the following steps that: S1, balance bridge insulation grounding switches of the doubles direct current power source systems are switched off; S2, positive and negative voltage-to-earth signals of the two direct current power source systems in a first switching resistance state are detected; S3, positive and negative voltage-to-earth signals of the two direct current power source systems in a second switching resistance state are detected; and S4, the type of direct current crossing in the double direct-current power source systems is judged based on the positive and negative voltage-to-earth signals in the above two states. With the method and device for detecting the direct current crossing in the double direct-current power source systems of the invention adopted, bus direct current crossing in the double direct-current power source systems can be effectively detected, and the type of the bus direct current crossing can be accurately determined.
Description
Technical field
The present invention relates to DC power system field, more particularly, relate to detection method and device that in a kind of two dc power supply system, direct current is altered mutually.
Background technology
In two dc power supply system, direct supply as main Control protection ring current, due to its cable branch and wiring outlet more, often there will be because mis-wired, touch by mistake, degradation causes under device performance bus direct current alters mutually.In two dc power supply system, bus direct current is altered mutually and is generally included positive bus-bar-positive bus-bar and alter mutually, and negative busbar-negative busbar is altered mutually, and positive bus-bar-negative busbar is altered mutually and altered mutually with negative busbar-positive bus-bar.Fig. 1 a-1d respectively illustrates in two dc power supply system, and the positive bus-bar-positive bus-bar in the first DC power system and the second DC power system is altered mutually, and negative busbar-negative busbar is altered mutually, and positive bus-bar-negative busbar alters the equivalent electrical circuit of altering mutually with negative busbar-positive bus-bar mutually.In two dc power supply system, the bus direct current of the first DC power system and the second DC power system is altered mutually and will be caused decreasing insulating, Insulation monitoring resistance deviation, and the serious problems such as busbar voltage unusual fluctuations.But do not have any method and apparatus that can detect two dc power supply system median generatrix direct current and alter mutually in prior art.
Summary of the invention
The technical problem to be solved in the present invention is, for prior art not any method and apparatus defect that can detect two dc power supply system median generatrix direct current and alter mutually, provide a kind of method and apparatus that effectively can detect two dc power supply system median generatrix direct current and alter mutually.
The technical solution adopted for the present invention to solve the technical problems is: construct the detection method that in a kind of two dc power supply system, direct current is altered mutually, comprising:
S1, closed first DC power system balance bridge insulating ground switch of the first DC power system and the second direct supply balance bridge insulating ground switch of the second DC power system;
S2, set described first DC power system and described second DC power system is in the first switching resistance states, detect the positive voltage-to-ground signal of the first DC power system first and the negative voltage-to-ground signal of the first DC power system first of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system first and the negative voltage-to-ground signal of the second DC power system first of the second DC power system;
S3, set described first DC power system and described second DC power system is in the second switching resistance states, detect the positive voltage-to-ground signal of the first DC power system second and the negative voltage-to-ground signal of the first DC power system second of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system second and the negative voltage-to-ground signal of the second DC power system second of described second DC power system;
S4, based on the positive voltage-to-ground signal of described first DC power system first, the negative voltage-to-ground signal of described first DC power system first, the positive voltage-to-ground signal of described second DC power system first, the negative voltage-to-ground signal of described second DC power system first, the positive voltage-to-ground signal of described first DC power system second, the negative voltage-to-ground signal of described first DC power system second, the positive voltage-to-ground signal of described second DC power system second and the negative voltage-to-ground signal of described second DC power system second, judge the kind that in described two dc power supply system, direct current is altered mutually.
In the detection method that direct current is altered mutually in two dc power supply system of the present invention, described first DC power system comprises at least one first switching resistance, and each first switching resistance at least one first switching resistance described is connected between the negative busbar of described first DC power system and ground or between the positive bus-bar being connected to described first DC power system and ground through the first switching resistance switch of correspondence respectively.
In the detection method that direct current is altered mutually in two dc power supply system of the present invention, described second DC power system comprises at least one second switching resistance, and each second switching resistance at least one second switching resistance described is connected between the negative busbar of described second DC power system and ground or between the positive bus-bar being connected to described second DC power system and ground through the second switching resistance switch of correspondence respectively.
In the detection method that direct current is altered mutually in two dc power supply system of the present invention, described first switching resistance states is the switch off state of the first switching resistance switch of one or more first switching resistance at least one first switching resistance described of described first DC power system, and described second switching resistance states is the switch closed condition of the first switching resistance switch of described one or more first switching resistance.
In the detection method that direct current is altered mutually in two dc power supply system of the present invention, described second switching resistance states is the switch off state of the first switching resistance switch of one or more first switching resistance at least one first switching resistance described of described first DC power system, and described first switching resistance states is the switch closed condition of the first switching resistance switch of described one or more first switching resistance.
In the detection method that direct current is altered mutually in two dc power supply system of the present invention, described first switching resistance states is the switch off state of the second switching resistance switch of one or more second switching resistance at least one second switching resistance described of described second DC power system, and described second switching resistance states is the switch closed condition of the second switching resistance switch of described one or more second switching resistance.
In the detection method that direct current is altered mutually in two dc power supply system of the present invention, described second switching resistance states is the switch off state of the second switching resistance switch of one or more second switching resistance at least one second switching resistance described of described second DC power system, and described first switching resistance states is the switch closed condition of the second switching resistance switch of described one or more second switching resistance.
In the detection method that direct current is altered mutually in two dc power supply system of the present invention, described step S4 comprises:
When the difference of the positive voltage-to-ground signal of the positive voltage-to-ground signal of the first DC power system first and the second DC power system first is less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal of the first DC power system second and the second DC power system second just voltage-to-ground signal is less than predetermined voltage threshold, judgement generation first DC power system positive bus-bar-the second DC power system positive bus-bar is altered mutually; When the positive voltage-to-ground signal of the first DC power system first and the difference of the second DC power system first negative voltage-to-ground signal are less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal of the first DC power system second and the negative voltage-to-ground signal of the second DC power system second is less than predetermined voltage threshold, judgement generation first DC power system positive bus-bar-the second DC power system negative busbar is altered mutually; When the difference of the positive voltage-to-ground signal of the first DC power system first negative voltage-to-ground signal and the second DC power system first is less than predetermined voltage threshold and the difference of the negative voltage-to-ground signal of the first DC power system second and the second DC power system second just voltage-to-ground signal is less than predetermined voltage threshold, judge that the first DC power system negative busbar and the second DC power system positive bus-bar direct current are altered mutually; When the difference of the first DC power system first negative voltage-to-ground signal and the second DC power system first negative voltage-to-ground signal is less than predetermined voltage threshold and the difference of the first DC power system second negative voltage-to-ground signal and the negative voltage-to-ground signal of the second DC power system second is less than predetermined voltage threshold, judge that generation first DC power system negative busbar-the second DC power system negative busbar is altered mutually.
Another technical scheme that the present invention solves the employing of its technical matters constructs the pick-up unit that in a kind of two dc power supply system, direct current is altered mutually, comprising:
Balance bridge insulating ground switch closure arrangement, for closed first DC power system balance bridge insulating ground switch of the first DC power system and the second direct supply balance bridge insulating ground switch of the second DC power system;
First detecting unit, for setting described first DC power system and described second DC power system is in the first switching resistance states, detect the positive voltage-to-ground signal of the first DC power system first and the negative voltage-to-ground signal of the first DC power system first of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system first and the negative voltage-to-ground signal of the second DC power system first of the second DC power system;
Second detecting unit, for setting described first DC power system and described second DC power system is in the second switching resistance states, detect the positive voltage-to-ground signal of the first DC power system second and the negative voltage-to-ground signal of the first DC power system second of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system second and the negative voltage-to-ground signal of the second DC power system second of described second DC power system;
Alter decision maker mutually, for based on the positive voltage-to-ground signal of described first DC power system first, the negative voltage-to-ground signal of described first DC power system first, the positive voltage-to-ground signal of described second DC power system first, the negative voltage-to-ground signal of described second DC power system first, the positive voltage-to-ground signal of described first DC power system second, the negative voltage-to-ground signal of described first DC power system second, the positive voltage-to-ground signal of described second DC power system second and the negative voltage-to-ground signal of described second DC power system second, judge the kind that in described two dc power supply system, direct current is altered mutually.
The pick-up unit that direct current is altered mutually in two dc power supply system of the present invention, described decision maker of altering mutually is further used for when the difference of the positive voltage-to-ground signal of the positive voltage-to-ground signal of the first DC power system first and the second DC power system first is less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal of the first DC power system second and the second DC power system second just voltage-to-ground signal is less than predetermined voltage threshold, and judgement generation first DC power system positive bus-bar-the second DC power system positive bus-bar is altered mutually; When the positive voltage-to-ground signal of the first DC power system first and the difference of the second DC power system first negative voltage-to-ground signal are less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal of the first DC power system second and the negative voltage-to-ground signal of the second DC power system second is less than predetermined voltage threshold, judgement generation first DC power system positive bus-bar-the second DC power system negative busbar is altered mutually; When the difference of the positive voltage-to-ground signal of the first DC power system first negative voltage-to-ground signal and the second DC power system first is less than predetermined voltage threshold and the difference of the negative voltage-to-ground signal of the first DC power system second and the second DC power system second just voltage-to-ground signal is less than predetermined voltage threshold, judge that the first DC power system negative busbar and the second DC power system positive bus-bar direct current are altered mutually; When the difference of the first DC power system first negative voltage-to-ground signal and the second DC power system first negative voltage-to-ground signal is less than predetermined voltage threshold and the difference of the first DC power system second negative voltage-to-ground signal and the negative voltage-to-ground signal of the second DC power system second is less than predetermined voltage threshold, judge that generation first DC power system negative busbar-the second DC power system negative busbar is altered mutually.
Implement detection method that in two dc power supply system of the present invention, direct current is altered mutually and device, effectively can detect two dc power supply system median generatrix direct current and alter mutually, accurately can also judge the kind that bus direct current is altered mutually.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 a is the equivalent circuit diagram that in two dc power supply system, positive bus-bar-positive bus-bar is altered mutually;
Fig. 1 b is the equivalent circuit diagram that in two dc power supply system, negative busbar-negative busbar is altered mutually;
Fig. 1 c is the equivalent circuit diagram that in two dc power supply system, positive bus-bar-negative busbar is altered mutually;
Fig. 1 d is the equivalent circuit diagram that in two dc power supply system, negative busbar-positive bus-bar is altered mutually;
Fig. 2 is the circuit diagram of the two dc power supply system comprising two switching resistance;
Fig. 3 shows the circuit diagram of the two dc power supply system comprising multiple switching resistance;
Fig. 4 is the process flow diagram of the detection method that in two dc power supply system according to a first embodiment of the present invention, direct current is altered mutually;
Fig. 5 is the process flow diagram of the detection method that in two dc power supply system according to a second embodiment of the present invention, direct current is altered mutually;
Fig. 6 a is the equivalent circuit diagram that after switching insulation switching resistance, in two dc power supply system, positive bus-bar-positive bus-bar is altered mutually;
Fig. 6 b is the equivalent circuit diagram that after switching insulation switching resistance, in two dc power supply system, positive bus-bar-negative busbar is altered mutually;
Fig. 6 c is the equivalent circuit diagram that after switching insulation switching resistance, in two dc power supply system, negative busbar-positive bus-bar is altered mutually;
Fig. 6 d is the equivalent circuit diagram that after switching insulation switching resistance, in two dc power supply system, negative busbar-negative busbar is altered mutually;
Fig. 7 is the theory diagram of the pick-up unit that in the two dc power supply system according to the first embodiment of the present invention, direct current is altered mutually.
Embodiment
Fig. 2 is the circuit diagram of the two dc power supply system comprising switching resistance.As shown in Figure 2, one end of switching resistance R5 is connected to the mid point of the balance bridge of the first DC power system 1, and the other end connects the negative busbar of the first DC power system 1 through insulation switching resistance switch K3.Those skilled in the art know in another embodiment of the invention, and one end of switching resistance R5 can be connected to the mid point of the balance bridge of the first DC power system, and the other end connects the positive bus-bar of the first DC power system through insulation switching resistance switch K3.As shown in Figure 2, switching resistance R6 one end is connected to the mid point of the balance bridge of the second DC power system 2, and the other end connects the negative busbar of the second DC power system 2 through insulation switching resistance switch K4.In another embodiment of the invention, one end of switching resistance R6 is connected to the mid point of the balance bridge of the second DC power system 2, and the other end connects the positive bus-bar of the second DC power system 2 through insulation switching resistance switch K4.
Those skilled in the art know, although Fig. 2 illustrate only the first DC power system 1 and the second DC power system 2 comprises a switching resistance respectively, but in other embodiments of the invention, first DC power system 1 and the second DC power system 2 can distinguish one, two or more switching resistance.One end of these switching resistance can be connected to the mid point of balance bridge, and the other end connects positive bus-bar and/or the negative busbar of DC power system through insulation switching resistance switch K3.
Those skilled in the art know further, and in two dc power supply system, can arbitrarily specify one of them DC power system to be the first DC power system, another DC power system is the second DC power system, and both can exchange.In one embodiment of the invention, described first DC power system is host power system, and described second DC power system is from electromechanical source system.Disconnected or close the balance bridge insulated switch of self by host power system, from the first and second resistance to earth signals electromechanical source system acquisition two states.Host power system inquires about the first and second resistance to earth signals from electromechanical source system by the mode that RS485 communicates, and thus judges host power system and from whether there is direct current between electromechanical source system alter mutually.In another embodiment of the invention, host power system can control to disconnect or the closed described balance bridge insulated switch from electromechanical source system from electromechanical source system, host power system gathers the host power system first and second resistance to earth signal under two states, thus judges host power system and from whether there is direct current between electromechanical source system alter mutually.In the embodiment of closed and disconnected switching resistance, and in the embodiment of voltage-to-ground signals collecting, main frame and from the operation of machine as above.
Fig. 3 shows the circuit diagram of the two dc power supply system comprising multiple switching resistance.As shown in Figure 3, first DC power system 1 comprises multiple switching resistance R14, R15 and R16, wherein, one end of switching resistance R14 is connected to the mid point of the balance bridge of the first DC power system 1 through insulation switching resistance switch K12, the other end connects the negative busbar of the first DC power system 1.One end of switching resistance R15 is connected to the mid point of the balance bridge of the first DC power system 1 through insulation switching resistance switch K13, the other end connects the positive bus-bar of the first DC power system 1.One end of switching resistance R16 is connected to the mid point of the balance bridge of the first DC power system 1 through insulation switching resistance switch K14, the other end connects the negative busbar of the first DC power system 1.As previously mentioned, this DC power system 1 can comprise more or less switching resistance.As further shown in figure 3, the second DC power system 2 comprises multiple switching resistance R24, R25 and R26.Wherein, one end of switching resistance R24 is connected to the mid point of the balance bridge of the second DC power system 2 through insulation switching resistance switch K22, the other end connects the negative busbar of the second DC power system 2.One end of switching resistance R25 is connected to the mid point of the balance bridge of the second DC power system 2 through insulation switching resistance switch K23, the other end connects the positive bus-bar of the second DC power system 2.One end of switching resistance R26 is connected to the mid point of the balance bridge of the second DC power system 2 through insulation switching resistance switch K24, the other end connects the negative busbar of the second DC power system 2.As previously mentioned, this DC power system 2 can comprise more or less switching resistance.
Fig. 4 is the process flow diagram of the detection method that in two dc power supply system according to a first embodiment of the present invention, direct current is altered mutually.Below the detection method of Fig. 4 is described.In step sl, closed first DC power system balance bridge insulating ground K switch 1 of the first DC power system and the second direct supply balance bridge insulating ground K switch 2 of the second DC power system.
In step s 2, set described first DC power system and described second DC power system is in the first switching resistance states, now detect the positive voltage-to-ground signal of the first DC power system first and the negative voltage-to-ground signal of the first DC power system first of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system first and the negative voltage-to-ground signal of the second DC power system first of the second DC power system.Those skilled in the art know, described first switching resistance states can be understood as the access state of any one in the first DC power system and the second DC power system, two or multiple switching resistance, or off-state.Namely this, the closed or off-state of insulation switching resistance switch that two or more switching resistance are corresponding.
In step s3, set described first DC power system and described second DC power system is in the second switching resistance states, detect the positive voltage-to-ground signal of the first DC power system second and the negative voltage-to-ground signal of the first DC power system second of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system second and the negative voltage-to-ground signal of the second DC power system second of described second DC power system.Those skilled in the art know, described first switching resistance states can be understood as the off-state of any one in the first DC power system and the second DC power system, two or multiple switching resistance, or access state.Namely this, the disconnection of insulation switching resistance switch that two or more switching resistance are corresponding or closure state.
The two dc power supply system comprising switching resistance below in conjunction with Fig. 2 is described step S2-3.In the embodiment shown in Figure 2, the first DC power system comprises insulation switching resistance R5, and the second DC power system comprises insulation switching resistance R6.Now, this the first switching resistance states can be the insulation switching resistance switch K4 off-state of the switching resistance R6 of the second DC power system, and this second switching resistance states can be the insulation switching resistance switch K4 closure state of the switching resistance R6 of the second DC power system, as long as now ensure when the first switching resistance states and the second switching resistance states, the state of the insulation switching resistance switch K3 of the switching resistance R5 of the first DC power system does not change.In like manner, now this first switching resistance states can be the insulation switching resistance switch K3 off-state of the switching resistance R5 of the first DC power system, and this second switching resistance states can be the insulation switching resistance switch K3 closure state of the switching resistance R5 of the first DC power system; As long as now ensure when the first switching resistance states and the second switching resistance states, the state of the insulation switching resistance switch K4 of the switching resistance R6 of the second DC power system does not change.
Those skilled in the art know, in one embodiment of the invention, only the first DC power system comprises insulation switching resistance R5, and the second DC power system does not comprise insulation switching resistance R6.Now this first switching resistance states can be the insulation switching resistance switch K3 off-state of the switching resistance R5 of the first DC power system, and this second switching resistance states can be the insulation switching resistance switch K3 closure state of the switching resistance R5 of the first DC power system.The insulation switching resistance switch K3 off-state of can certainly to be this second switching resistance states the be switching resistance R5 of the first DC power system, and this first switching resistance states can be the insulation switching resistance switch K3 closure state of the switching resistance R5 of the first DC power system.In like manner, in another embodiment of the invention, the first DC power system does not comprise insulation switching resistance R5, and only the second DC power system comprises insulation switching resistance R6.Now this first switching resistance states can be the insulation switching resistance switch K4 off-state of the switching resistance R6 of the second DC power system, and this second switching resistance states can be the insulation switching resistance switch K4 closure state of the switching resistance R6 of the second DC power system.As previously mentioned, this first switching resistance states and this second switching resistance states can exchange.
The two dc power supply system comprising multiple switching resistance below in conjunction with Fig. 3 is described step S2-3.In the embodiment shown in fig. 3, the first DC power system 1 comprises multiple switching resistance R14, R15 and R16, and the second DC power system 2 comprises multiple switching resistance R24, R25 and R26.In the present embodiment, this the first switching resistance states can be in switching resistance R14, R15 and R16 of the first DC power system any one, the insulation switching resistance switch off-state of two or three, and this second switching resistance states can be this of being disconnected, the closure state of insulation switching resistance switch of two or three, as long as now ensure, when the first switching resistance states and the second switching resistance states, not changed by the state of the switching resistance operated in the first DC power system and the second DC power system.In like manner, this the first switching resistance states can be in switching resistance R24, R25 and R26 of the second DC power system any one, the insulation switching resistance switch off-state of two or three, and this second switching resistance states can be this of being disconnected, the closure state of insulation switching resistance switch of two or three, as long as now ensure, when the first switching resistance states and the second switching resistance states, not changed by the state of the switching resistance operated in the first DC power system and the second DC power system.In addition, as previously mentioned, described first switching resistance states and the second switching resistance states can with exchange.
In step s 4 which, based on the positive voltage-to-ground signal of described first DC power system first, the negative voltage-to-ground signal of described first DC power system first, the positive voltage-to-ground signal of described second DC power system first, the negative voltage-to-ground signal of described second DC power system first, the positive voltage-to-ground signal of described first DC power system second, the negative voltage-to-ground signal of described first DC power system second, the positive voltage-to-ground signal of described second DC power system second and the negative voltage-to-ground signal of described second DC power system second, judge the kind that in described two dc power supply system, direct current is altered mutually.
In one embodiment of the invention, when the difference of the positive voltage-to-ground signal of the positive voltage-to-ground signal of the first DC power system first and the second DC power system first is less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal of the first DC power system second and the second DC power system second just voltage-to-ground signal is less than predetermined voltage threshold, judgement generation first DC power system positive bus-bar-the second DC power system positive bus-bar is altered mutually; When the positive voltage-to-ground signal of the first DC power system first and the difference of the second DC power system first negative voltage-to-ground signal are less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal of the first DC power system second and the negative voltage-to-ground signal of the second DC power system second is less than predetermined voltage threshold, judgement generation first DC power system positive bus-bar-the second DC power system negative busbar is altered mutually; When the difference of the positive voltage-to-ground signal of the first DC power system first negative voltage-to-ground signal and the second DC power system first is less than predetermined voltage threshold and the difference of the negative voltage-to-ground signal of the first DC power system second and the second DC power system second just voltage-to-ground signal is less than predetermined voltage threshold, judge that the first DC power system negative busbar and the second DC power system positive bus-bar direct current are altered mutually; When the difference of the first DC power system first negative voltage-to-ground signal and the second DC power system first negative voltage-to-ground signal is less than predetermined voltage threshold and the difference of the first DC power system second negative voltage-to-ground signal and the negative voltage-to-ground signal of the second DC power system second is less than predetermined voltage threshold, judge that generation first DC power system negative busbar-the second DC power system negative busbar is altered mutually.
Implement the detection method that in two dc power supply system of the present invention, direct current is altered mutually, effectively can detect two dc power supply system median generatrix direct current and alter mutually, accurately can also judge the kind that bus direct current is altered mutually.
Fig. 5 is the process flow diagram of the detection method that in two dc power supply system according to a second embodiment of the present invention, direct current is altered mutually.Embodiments of the invention shown in Fig. 5 are described based on the system shown in Fig. 2.As shown in Figure 5, in step sl, closed first DC power system balance bridge insulating ground K switch 1 of the first DC power system and the second direct supply balance bridge insulating ground K switch 2 of the second DC power system.In step s 2, disconnection insulation switching resistance switch K3, namely sets described first DC power system and described second DC power system is in the first switching resistance states.Now detect the positive voltage-to-ground signal Vkp1 and the first DC power system first negative voltage-to-ground signal Vkn1 of the first DC power system first of described first DC power system.In step s3, the positive voltage-to-ground signal Vkp2 and the second DC power system first negative voltage-to-ground signal Vkn2 of the second DC power system first of described second DC power system is detected.Perform step S4 subsequently, closed insulation switching resistance switch K3, namely sets described first DC power system and described second DC power system is in the second switching resistance states.In step s 5, the positive voltage-to-ground signal Vkp1t and the first DC power system second negative voltage-to-ground signal Vkn1t of the first DC power system second of described first DC power system is detected.In step s 6, the positive voltage-to-ground signal Vkp2t and the second DC power system second negative voltage-to-ground signal Vkn2t of the second DC power system second of described second DC power system is detected.Perform step S7 subsequently, determine whether that the difference of the positive voltage-to-ground signal Vkp1t and the second DC power system second negative voltage-to-ground signal Vkn2t of the first DC power system second is less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal Vkp1 and the second DC power system first negative voltage-to-ground signal Vkn2 of the first DC power system first is less than predetermined voltage threshold.If perform step S8, otherwise perform step S9.In step s 8, judge that the first DC power system 1 positive bus-bar and the second DC power system 2 negative busbar direct current are altered mutually.In step s 9, determine whether that the difference of the first DC power system second negative voltage-to-ground signal Vkn1t and the second DC power system second negative voltage-to-ground signal Vkn2t is less than predetermined voltage threshold and the difference of the first DC power system first negative voltage-to-ground signal Vkn1 and the second DC power system first negative voltage-to-ground signal Vkn2 is less than predetermined voltage threshold.If perform step S10, otherwise perform step S11.In step slo, judge that the first DC power system 1 negative busbar and the second DC power system 2 negative busbar direct current are altered mutually.In step s 11, determine whether that the difference of the positive voltage-to-ground signal Vkp1 of the first DC power system first and the positive voltage-to-ground signal Vkp2 of the second DC power system first is less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal Vkp1t and the second DC power system second negative voltage-to-ground signal Vkn2t of the first DC power system second is less than predetermined voltage threshold, if perform step S12, otherwise perform step S13.In step s 12, judge that the first DC power system 1 positive bus-bar and the second DC power system 2 positive bus-bar direct current are altered mutually.In step s 13, when the difference of the positive voltage-to-ground signal Vkp2t of the first DC power system second negative voltage-to-ground signal Vkn1t and the second DC power system second is less than predetermined voltage threshold and the difference of the first DC power system first negative voltage-to-ground signal Vkn1 and the second DC power system first just voltage-to-ground signal Vkp2 is less than predetermined voltage threshold, if perform step S14 to judge that the first DC power system 1 negative busbar and the second DC power system 2 positive bus-bar direct current are altered mutually, otherwise testing process terminates, export result bus not occurring and alters mutually.
Based on instruction of the present invention, the judgement order of step S7, S9, S11 and S13 can be exchanged.Such as first perform step S9, then perform step S7, S11 and S13, or also can perform step S7, S9, S11 and S13 simultaneously.Those skilled in the art can as required, design procedure S7, the deterministic process of S9, S11 and S13.Those skilled in the art know simultaneously, and the order of step S2-4 can be exchanged.Step S2 and 3 can perform simultaneously, and step S5 and S6 also can perform simultaneously.
Below in conjunction with Fig. 6 a-6d, principle of the present invention is described as follows.
1) the first DC power system positive bus-bar-the second DC power system positive bus-bar is altered mutually
When the balance bridge insulated switch K1 of the first DC power system 1 closes and the balance bridge insulated switch K2 of the second DC power system 2 closes, if alter just mutually, because the first DC power system 1 and the second DC power system 2 all access ground PE, so the positive voltage-to-ground of the first DC power system 1 and the second DC power system 2 is inevitable equal, when after eliminating error factor, think that both differences should be less than predetermined voltage threshold.As shown in Figure 6 a, when the insulation switching resistance switch K3 of closed first DC power system 1 is to drop into switching resistance R5, the positive voltage-to-ground of the first DC power system 1 and the second DC power system 2 obviously can change, but it obviously needs equal, when after eliminating error factor, think that both differences should be less than predetermined voltage threshold.Therefore, when the positive voltage-to-ground signal Vkp1 of the first DC power system first and the difference of the positive voltage-to-ground signal Vkp2 of the second DC power system first are less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal Vkp1t of the first DC power system second and the second DC power system second just voltage-to-ground signal Vkp2t is less than predetermined voltage threshold, judgement generation first DC power system positive bus-bar-the second DC power system positive bus-bar is altered mutually.
2) the first DC power system positive bus-bar-the second DC power system negative busbar is altered mutually
When the balance bridge insulated switch K1 of the first DC power system 1 closes and the balance bridge insulated switch K2 of the second DC power system 2 closes, alter mutually if positive and negative, because the first DC power system 1 and the second DC power system 2 all access ground PE, so the negative voltage-to-ground of the positive voltage-to-ground of the first DC power system 1 and the second DC power system 2 is inevitable equal, when after eliminating error factor, think that both differences should be less than predetermined voltage threshold.As shown in Figure 6 b, when the insulation switching resistance switch K3 of closed first DC power system 1 is to drop into switching resistance R5, the positive voltage-to-ground of the first DC power system 1 and the negative voltage-to-ground of the second DC power system 2 obviously can change, but it obviously needs equal, when after eliminating error factor, think that both differences should be less than predetermined voltage threshold.Therefore when the difference of the positive voltage-to-ground signal Vkp1t and the second DC power system second negative voltage-to-ground signal Vkn2t of described first DC power system second is less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal Vkp1 and the second DC power system first negative voltage-to-ground signal Vkn2 of the first DC power system first is less than predetermined voltage threshold, judgement generation first DC power system positive bus-bar-the second DC power system negative busbar is altered mutually.
3) the first DC power system negative busbar-the second DC power system positive bus-bar is altered mutually
When the balance bridge insulated switch K1 of the first DC power system 1 closes and the balance bridge insulated switch K2 of the second DC power system 2 closes, alter just mutually if negative, because the first DC power system 1 and the second DC power system 2 all access ground PE, so the positive voltage-to-ground of the negative voltage-to-ground of the first DC power system 1 and the second DC power system 2 is inevitable equal, when after eliminating error factor, think that both differences should be less than predetermined voltage threshold.As fig. 6 c, when the insulation switching resistance switch K3 of closed first DC power system 1 is to drop into switching resistance R5, the negative voltage-to-ground of the first DC power system 1 and the positive voltage-to-ground of the second DC power system 2 obviously can change, but it obviously needs equal, when after eliminating error factor, think that both differences should be less than predetermined voltage threshold.Therefore when the difference of the positive voltage-to-ground signal Vkp2t of the first DC power system second negative voltage-to-ground signal Vkn1t and the second DC power system second is less than predetermined voltage threshold and the first DC power system first negative voltage-to-ground signal Vkn1 is less than predetermined voltage threshold with the difference of the positive voltage-to-ground signal Vkp2 of the second DC power system first, if execution step S14 judges that the first DC power system 1 negative busbar and the second DC power system 2 positive bus-bar direct current are altered mutually.
4) the first DC power system positive bus-bar-the second DC power system negative busbar is altered mutually
When the balance bridge insulated switch K1 of the first DC power system 1 closes and the balance bridge insulated switch K2 of the second DC power system 2 closes, alter mutually if negative, because the first DC power system 1 and the second DC power system 2 all access ground PE, so the negative voltage-to-ground of the negative voltage-to-ground of the first DC power system 1 and the second DC power system 2 is inevitable equal, when after eliminating error factor, think that both differences should be less than predetermined voltage threshold.As shown in fig 6d, when the insulation switching resistance switch K3 of closed first DC power system 1 is to drop into switching resistance R5, the negative voltage-to-ground of the first DC power system 1 and the negative voltage-to-ground of the second DC power system 2 obviously can change, but it obviously needs equal, when after eliminating error factor, think that both differences should be less than predetermined voltage threshold.Therefore when the difference of described first DC power system second negative voltage-to-ground signal Vkn1t and the second DC power system second negative voltage-to-ground signal Vkn2t is less than predetermined voltage threshold and the difference of the first DC power system first negative voltage-to-ground signal Vkn1 and the second DC power system first negative voltage-to-ground signal Vkn2 is less than predetermined voltage threshold, judge that generation first DC power system negative busbar-the second DC power system negative busbar is altered mutually.
Fig. 7 is the theory diagram of the pick-up unit that in the two dc power supply system according to the first embodiment of the present invention, direct current is altered mutually.As shown in Figure 7, pick-up unit of the present invention comprises balance bridge insulating ground switch closure arrangement 100, first detecting unit 200, second detecting unit 300 and alters decision maker 400 mutually.Described balance bridge insulating ground switch closure arrangement 100 is for closed first DC power system balance bridge insulating ground switch of the first DC power system and the second direct supply balance bridge insulating ground switch of the second DC power system.First detecting unit 200 is for setting described first DC power system and described second DC power system is in the first switching resistance states, detect the positive voltage-to-ground signal of the first DC power system first and the negative voltage-to-ground signal of the first DC power system first of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system first and the negative voltage-to-ground signal of the second DC power system first of the second DC power system.Second detecting unit 300, for setting described first DC power system and described second DC power system is in the second switching resistance states, detect the positive voltage-to-ground signal of the first DC power system second and the negative voltage-to-ground signal of the first DC power system second of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system second and the negative voltage-to-ground signal of the second DC power system second of described second DC power system.Alter decision maker 400 mutually for based on the positive voltage-to-ground signal of described first DC power system first, the negative voltage-to-ground signal of described first DC power system first, the positive voltage-to-ground signal of described second DC power system first, the negative voltage-to-ground signal of described second DC power system first, the positive voltage-to-ground signal of described first DC power system second, the negative voltage-to-ground signal of described first DC power system second, the positive voltage-to-ground signal of described second DC power system second and the negative voltage-to-ground signal of described second DC power system second, judge the kind that in described two dc power supply system, direct current is altered mutually.
Those skilled in the art know, described balance bridge insulating ground switch closure arrangement 100, first detecting unit 200, second detecting unit 300 and the embodiment of altering the detection method that decision maker 400 can be altered mutually according to direct current in the above-mentioned two dc power supply system of the present invention mutually construct.Based on instruction of the present invention, those skilled in the art can construct above-mentioned detection device, have just been not repeated at this.
Implement the pick-up unit that in two dc power supply system of the present invention, direct current is altered mutually, effectively can detect two dc power supply system median generatrix direct current and alter mutually, accurately can also judge the kind that bus direct current is altered mutually.
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 (10)
1. the detection method that in two dc power supply system, direct current is altered mutually, is characterized in that, comprising:
S1, closed first DC power system balance bridge insulating ground switch of the first DC power system and the second direct supply balance bridge insulating ground switch of the second DC power system;
S2, set described first DC power system and described second DC power system is in the first switching resistance states, detect the positive voltage-to-ground signal of the first DC power system first and the negative voltage-to-ground signal of the first DC power system first of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system first and the negative voltage-to-ground signal of the second DC power system first of the second DC power system;
S3, set described first DC power system and described second DC power system is in the second switching resistance states, detect the positive voltage-to-ground signal of the first DC power system second and the negative voltage-to-ground signal of the first DC power system second of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system second and the negative voltage-to-ground signal of the second DC power system second of described second DC power system;
S4, based on the positive voltage-to-ground signal of described first DC power system first, the negative voltage-to-ground signal of described first DC power system first, the positive voltage-to-ground signal of described second DC power system first, the negative voltage-to-ground signal of described second DC power system first, the positive voltage-to-ground signal of described first DC power system second, the negative voltage-to-ground signal of described first DC power system second, the positive voltage-to-ground signal of described second DC power system second and the negative voltage-to-ground signal of described second DC power system second, judge the kind that in described two dc power supply system, direct current is altered mutually.
2. the detection method that in two dc power supply system according to claim 1, direct current is altered mutually, it is characterized in that, described first DC power system comprises at least one first switching resistance, and each first switching resistance at least one first switching resistance described is connected between the negative busbar of described first DC power system and ground or between the positive bus-bar being connected to described first DC power system and ground through the first switching resistance switch of correspondence respectively.
3. the detection method that in two dc power supply system according to claim 1 and 2, direct current is altered mutually, it is characterized in that, described second DC power system comprises at least one second switching resistance, and each second switching resistance at least one second switching resistance described is connected between the negative busbar of described second DC power system and ground or between the positive bus-bar being connected to described second DC power system and ground through the second switching resistance switch of correspondence respectively.
4. the detection method that in two dc power supply system according to claim 3, direct current is altered mutually, it is characterized in that, described first switching resistance states is the switch off state of the first switching resistance switch of one or more first switching resistance at least one first switching resistance described of described first DC power system, and described second switching resistance states is the switch closed condition of the first switching resistance switch of described one or more first switching resistance.
5. the detection method that in two dc power supply system according to claim 3, direct current is altered mutually, it is characterized in that, described second switching resistance states is the switch off state of the first switching resistance switch of one or more first switching resistance at least one first switching resistance described of described first DC power system, and described first switching resistance states is the switch closed condition of the first switching resistance switch of described one or more first switching resistance.
6. the detection method that in two dc power supply system according to claim 3, direct current is altered mutually, it is characterized in that, described first switching resistance states is the switch off state of the second switching resistance switch of one or more second switching resistance at least one second switching resistance described of described second DC power system, and described second switching resistance states is the switch closed condition of the second switching resistance switch of described one or more second switching resistance.
7. the detection method that in two dc power supply system according to claim 3, direct current is altered mutually, it is characterized in that, described second switching resistance states is the switch off state of the second switching resistance switch of one or more second switching resistance at least one second switching resistance described of described second DC power system, and described first switching resistance states is the switch closed condition of the second switching resistance switch of described one or more second switching resistance.
8. the detection method that in two dc power supply system according to claim 1, direct current is altered mutually, it is characterized in that, described step S4 comprises: when the difference of the positive voltage-to-ground signal of the positive voltage-to-ground signal of the first DC power system first and the second DC power system first is less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal of the first DC power system second and the second DC power system second just voltage-to-ground signal is less than predetermined voltage threshold, judgement generation first DC power system positive bus-bar-the second DC power system positive bus-bar is altered mutually; When the positive voltage-to-ground signal of the first DC power system first and the difference of the second DC power system first negative voltage-to-ground signal are less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal of the first DC power system second and the negative voltage-to-ground signal of the second DC power system second is less than predetermined voltage threshold, judgement generation first DC power system positive bus-bar-the second DC power system negative busbar is altered mutually; When the difference of the positive voltage-to-ground signal of the first DC power system first negative voltage-to-ground signal and the second DC power system first is less than predetermined voltage threshold and the difference of the negative voltage-to-ground signal of the first DC power system second and the second DC power system second just voltage-to-ground signal is less than predetermined voltage threshold, judge that the first DC power system negative busbar and the second DC power system positive bus-bar direct current are altered mutually; When the difference of the first DC power system first negative voltage-to-ground signal and the second DC power system first negative voltage-to-ground signal is less than predetermined voltage threshold and the difference of the first DC power system second negative voltage-to-ground signal and the negative voltage-to-ground signal of the second DC power system second is less than predetermined voltage threshold, judge that generation first DC power system negative busbar-the second DC power system negative busbar is altered mutually.
9. the pick-up unit that in two dc power supply system, direct current is altered mutually, is characterized in that, comprising:
Balance bridge insulating ground switch closure arrangement, for closed first DC power system balance bridge insulating ground switch of the first DC power system and the second direct supply balance bridge insulating ground switch of the second DC power system;
First detecting unit, for setting described first DC power system and described second DC power system is in the first switching resistance states, detect the positive voltage-to-ground signal of the first DC power system first and the negative voltage-to-ground signal of the first DC power system first of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system first and the negative voltage-to-ground signal of the second DC power system first of the second DC power system;
Second detecting unit, for setting described first DC power system and described second DC power system is in the second switching resistance states, detect the positive voltage-to-ground signal of the first DC power system second and the negative voltage-to-ground signal of the first DC power system second of described first DC power system, detect the positive voltage-to-ground signal of the second DC power system second and the negative voltage-to-ground signal of the second DC power system second of described second DC power system;
Alter decision maker mutually, for based on the positive voltage-to-ground signal of described first DC power system first, the negative voltage-to-ground signal of described first DC power system first, the positive voltage-to-ground signal of described second DC power system first, the negative voltage-to-ground signal of described second DC power system first, the positive voltage-to-ground signal of described first DC power system second, the negative voltage-to-ground signal of described first DC power system second, the positive voltage-to-ground signal of described second DC power system second and the negative voltage-to-ground signal of described second DC power system second, judge the kind that in described two dc power supply system, direct current is altered mutually.
10. the pick-up unit that in two dc power supply system according to claim 9, direct current is altered mutually, it is characterized in that, described decision maker of altering mutually is further used for when the difference of the positive voltage-to-ground signal of the positive voltage-to-ground signal of the first DC power system first and the second DC power system first is less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal of the first DC power system second and the second DC power system second just voltage-to-ground signal is less than predetermined voltage threshold, and judgement generation first DC power system positive bus-bar-the second DC power system positive bus-bar is altered mutually; When the positive voltage-to-ground signal of the first DC power system first and the difference of the second DC power system first negative voltage-to-ground signal are less than predetermined voltage threshold and the difference of the positive voltage-to-ground signal of the first DC power system second and the negative voltage-to-ground signal of the second DC power system second is less than predetermined voltage threshold, judgement generation first DC power system positive bus-bar-the second DC power system negative busbar is altered mutually; When the difference of the positive voltage-to-ground signal of the first DC power system first negative voltage-to-ground signal and the second DC power system first is less than predetermined voltage threshold and the difference of the negative voltage-to-ground signal of the first DC power system second and the second DC power system second just voltage-to-ground signal is less than predetermined voltage threshold, judge that the first DC power system negative busbar and the second DC power system positive bus-bar direct current are altered mutually; When the difference of the first DC power system first negative voltage-to-ground signal and the second DC power system first negative voltage-to-ground signal is less than predetermined voltage threshold and the difference of the first DC power system second negative voltage-to-ground signal and the negative voltage-to-ground signal of the second DC power system second is less than predetermined voltage threshold, judge that generation first DC power system negative busbar-the second DC power system negative busbar is altered mutually.
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