CN100386940C - Electric power system - Google Patents
Electric power system Download PDFInfo
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- CN100386940C CN100386940C CNB2005100734307A CN200510073430A CN100386940C CN 100386940 C CN100386940 C CN 100386940C CN B2005100734307 A CNB2005100734307 A CN B2005100734307A CN 200510073430 A CN200510073430 A CN 200510073430A CN 100386940 C CN100386940 C CN 100386940C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
To provide an electric power system that prevents failures in either the converter or the DC power source from influencing the other, to cause the supply of electricity to be disabled before it happens, and to improve its reliability.An electric power system is provided with a generator, a converter for converting the power generated by the generator into DC power, a DC power source connected to the DC output side of the converter via a DC voltage portion, and loads connected to the DC voltage portion. At least either diodes 70P, 70N, and /or at least either of diodes 80P, 80N are connected to a positive-side DC bus-bar 60P, a negative side DC bus-bar 60N between a converter 20 or a DC power source 50 and a DC voltage portion 40.Also, a snubber capacitor 28 is connected between the positive and negative poles of the output terminal of a converter 20A, and a capacitor 41 for voltage smoothing is connected to the DC voltage 40, respectively.
Description
Technical field
The present invention relates to that at least one particularly relates to the technology that improves power system reliability to the electric power system of load supply capability from generator and DC power supply.
Background technology
Figure 12 represents the conventional art of the electric power system of two direction load supply capabilities from generator and DC power supply.
In the drawings, the 10th, generators such as synchronous motor, induction motor, DC generator, the mechanical energy of the drive sources such as internal combustion office of expression supply is not converted to electric energy from figure.This electric energy is transformed to required direct current power by converter 20, and supply load (DC load) 30.
In addition, drive source when the outside stops to make generator 10 can't obtain under the situation of mechanical energy from drive source, and desire minimizing generator 10 can obtain the some or all of consumption electric power of loads 30 from DC power supply 50 under the situation of the mechanical energy of drive source acquisition.
By this electric power system, can often supply with direct current power to load 30.In addition, the 40th, direct current splenium, the P between converter 20 and the DC power supply 50 is that positive pole, the N of direct current splenium 40 is negative poles.
Figure 13 is the circuit diagram of a routine major part structure of above-mentioned electric power system.
When generator shown in Figure 12 10 is under the situation of three-phase alternating current machine, as converter 20, can use three-phase inverter, this three-phase inverter possesses three-phase two inverse parallels is connected with the arm that the thyristor 21 of backflow diode 22 is connected in series.In addition, the 23rd, the capacitor, the 24th that is connected with the direct current outlet side of converter 20, the control circuit of the unlatching/disconnection control signal of output switch element 21.
In addition, as DC power supply 50, can use the diode bridge that constitutes by the diode 51 that is connected with AC power.
If according to structure shown in Figure 13, then not only can be by the voltage of converter 20 control direct current spleniums 40, if the voltage control that makes direct current splenium 40 in advance is more than the peak value of the voltage between lines of AC power, then can also supply with all load electrics, and electric current is flowed into from DC power supply 50 from generator 10.In addition, as previously mentioned, under the situation that the generation power of generator 10 tails off, be lower than the peak value of the voltage between lines of AC power, then can obtain load electric partly or completely from DC power supply 50 by the voltage that makes direct current splenium 40.
In addition, above-mentioned electric power system is documented in the following patent documentation 1.
Patent documentation 1: the spy opens 2003-161541 communique ([0027]～[0030], Fig. 2, Fig. 3 etc.)
Invent problem to be solved
Figure 12 is in conventional art shown in Figure 13, the following problem that produces when converter 20 or DC power supply 50 break down.
Become when converter 20 under the situation of the fault mode that causes direct current splenium 40 short-circuit conditions (for example going up underarm opens etc. simultaneously), the voltage of direct current splenium 40 can't keep the enough numerical value to load 30 supply capabilities, under the situation worst, excessive electric current flows into converter 20 from DC power supply 50, and the consequent overheated DC power supply 50 that also can make itself breaks down.In this state, then can not supply with required electric power to load 30.
Particularly ought require load 30 continuously under the situations of running, for example, when load 30 be cooling as the internal combustion office of the drive source of generator 10 with situations such as motor components under, in above-mentioned electric power system, then be short of reliability.
Like this too for DC power supply 50; under situation about breaking down under the pattern that DC power supply 50 is short-circuited direct current splenium 40; converter 20 becomes any state that breaks down or it is shut down by defencive function; as hereinbefore, this moment can't be to load 30 supply capabilities.
Summary of the invention
Therefore, problem to be solved by this invention is to provide a kind of electric power system, thereby can break down to the side when converter or DC power supply and influence the opposing party and can't prevent trouble before it happens to the situation of load supply capability, and the raising reliability.
In order to solve above-mentioned problem, the described invention of claim 1 is a kind of power-supply system, it possesses generator, the DC power supply that will be connected with the outlet side of this converter by this generator electricity force transformation converter that is direct current power, by the direct current splenium, the load that is connected with described direct current splenium, wherein
From described converter on the direction of described direct current splenium supply capability diode is connected positive side dc bus between described converter and the direct current splenium or minus side dc bus at least one on.
The described invention of claim 2 is a kind of power-supply system, it possesses generator, the DC power supply that will be connected with the outlet side of this converter by this generator electricity force transformation converter that is direct current power, by the direct current splenium, the load that is connected with described direct current splenium, wherein
From described DC power supply on the direction of described direct current splenium supply capability diode is connected positive side dc bus between described DC power supply and the direct current splenium or minus side dc bus at least one on.
The described invention of claim 3 has: the diode that is connected between the described converter of claim 1 and direct current splenium, the diode that is connected between the described DC power supply of claim 2 and direct current splenium.
The described invention of claim 4 is that in claim 1 or claim 3, aforementioned generator has the exciting part that is made of electromagnet or permanent magnet.
The described invention of claim 5 is, in claim 4, non-loaded induced voltage by the rotation because of aforementioned generator produces by the backflow diode in the aforementioned converter, charges to the capacitor that is connected with the direct current outlet side of aforementioned converter.
The described invention of claim 6 is, in any one of claim 1～claim 5, supplies with the power supply of the control circuit of aforementioned converter from aforementioned direct voltage portion.
The described invention of claim 7 is, in claim 6, is the stabilizing circuit of assigned voltage by the dc voltage conversion that makes described direct current splenium, supplies with the power supply of described control circuit.
The described invention of claim 8 is, in claim 1, connects buffer condenser between the both positive and negative polarity of the lead-out terminal of aforementioned converter, and, between the both positive and negative polarity of aforementioned direct current splenium, connect the voltage smmothing capacitor.
The described invention of claim 9 is that in claim 8, the voltage that has according to aforementioned direct current splenium carries out superpotential judgement, and controls the electric current of aforementioned generator or the control circuit of energy output according to the VD of aforementioned converter.
The described invention of claim 10 is, in claim 8, have electric current or energy output that the direct voltage according to aforementioned direct current splenium carries out superpotential judgement and controls aforementioned generator, simultaneously, control aforementioned converter so that aforementioned energy output is non-negative control circuit.
The described invention of claim 11 is, in claim 1, connects the voltage smmothing capacitor between the both positive and negative polarity of the lead-out terminal of aforementioned converter.
According to the present invention, as long as connecting diode between the converter direct current splenium or on the dc bus between DC power supply-direct current splenium, its fault effects the opposing party when one side that not only can prevent converter or DC power supply breaks down, and can supply with stable electric power, thereby realize the high electric power system of reliability to load.
Description of drawings
Fig. 1 is the structure chart of the 1st execution mode of the present invention.
Fig. 2 is the structure chart of the 2nd execution mode of the present invention.
Fig. 3 is the structure chart of the 3rd execution mode of the present invention.
Fig. 4 is the structure chart of the 5th execution mode of the present invention.
Fig. 5 is the structure chart of the 6th execution mode major part of the present invention.
Fig. 6 is the structure chart of the 7th execution mode of the present invention.
Fig. 7 is the structure chart of the 8th execution mode of the present invention.
Fig. 8 is the structure chart of major part among Fig. 7.
Fig. 9 is the structure chart of the 9th execution mode of the present invention.
Figure 10 is the structure chart of major part among Fig. 9.
Figure 11 is the structure chart of the major part of the 10th execution mode of the present invention.
Figure 12 is the structure chart of conventional art.
Figure 13 is the circuit diagram of a routine major part among Figure 12.
Symbol description: 10 generators; 20,20A converter; 25,26 control circuits; The 25A power line; 27 stabilizing circuits; 28 buffer condensers; 30 loads; 40 direct current spleniums; 41 voltage smmothing capacitors; 50 DC power supply; 60P, 60N dc bus; 70P, 70N, 80P, 80N diode; 90,90A control circuit; 91,91A dynamo current or energy output control part; 911,913 calculators; 912 adjusters; 914 wave filters of making an uproar; 915 energy output lower limit amplitude limiters; 92 overvoltage judging parts.
Embodiment
With reference to the accompanying drawings, embodiments of the present invention are described.
At first, Fig. 1 is the structure chart of of the present invention 1st execution mode corresponding with claim 1, the inscape mark identical reference marks identical with Figure 12, and omit its explanation, will mainly describe below around its different piece.
In Fig. 1, positive side dc bus 60P between converter 20 and the direct current splenium 40 and minus side dc bus 60N are being connected with negative side diode 70N with side of the positive electrode diode 70P respectively on the direction of direct current splenium 40 supply capabilities from converter 20.
According to above-mentioned structure,,, can prevent that then electric current from flowing into converter 20 sides from DC power supply 40 by direct current splenium 40 under the pattern that makes its lead-out terminal short circuit according to the effect of diode 70P, 70N even converter 20 breaks down.Therefore, the short trouble of converter 20 can not involve DC power supply 50 sides, for example can prevent overcurrent from DC power supply 50 flow-reversal devices 20, and make DC power supply 50 overheated breaking down.
Like this, when converter 20 breaks down, still can be from DC power supply 50 to load 30 supply capabilities.
In addition, both need diode 70P, 70N, even only insert wherein any one, still can bring into play effect same as described above.
Secondly, Fig. 2 is the structure chart of of the present invention 2nd execution mode corresponding with claim 2.
Present embodiment is an example, and dc bus 60P, 60N between its expression DC power supply 50 and the direct current splenium 40 are being connected with anodal diode 80P, negative pole diode 80N respectively on the direction of direct current splenium 40 supply capabilities from DC power supply 50.In addition, Ps represents the positive pole of DC power supply 50, the negative pole that Ns represents this DC power supply.
In the present embodiment, even DC power supply 50 breaks down under the pattern of its lead-out terminal short circuit, effect according to diode 80P, 80N, the short trouble of DC power supply 50 can not involve converter 20, for example can prevent that overcurrent from flowing to DC power supply 50 from converter 20 by direct current splenium 40, and make converter 20 overheated breaking down.
In other words, in the present embodiment, when DC power supply 50 breaks down, still can be from converter 20 to load 30 supply capabilities.
In addition, both need diode 80P, 80N, as long as insert wherein any one.
Fig. 3 is the structure chart of of the present invention 3rd execution mode corresponding with claim 3.
This execution mode is equivalent to the combination of the 1st and the 2nd execution mode, is connecting diode 70P, 70N, 80P, 80N on dc bus 60P, the 60N of converter 20 sides, DC power supply 50 sides.
According to present embodiment, even either party breaks down under the pattern that makes its lead-out terminal short circuit among both for converter 20 or DC power supply 50, because its fault can not involve the opposing party, therefore, still can be from other direction load 30 supply capabilities.
Also be so in the present embodiment, as long as insert diode 70P, any one of 70N and any one of diode 80P, 80N.
Below, of the present invention 4th execution mode corresponding with claim 4 and claim 5 described.
In the structure of Fig. 1 or Fig. 3, as shown in figure 13, use when dc output end is connecting the converter of capacitor 23 as converter 20, be under the halted state and during start-up system at generator 10, because the existence of diode 70P, 70N, electric current can't flow into converter 20 from DC power supply 50.Therefore, above-mentioned capacitor 23 is not recharged, and can't start converter 20.
Therefore, the 4th execution mode is conceived to following situation, when generator 10 has the exciting magnet that is made of electromagnet and permanent magnet, generator 10 rotates by drive source, so on stator winding, produce non-loaded induced voltage, therefore, if utilize this voltage, then can charge to capacitor 23.
In other words, if produce non-loaded induced voltage from generator 10,, work as rectifier with the diode that these switch element inverse parallels are connected even all switch elements of converter 20 are in closed condition so, the capacitor 23 of converter 20 is recharged, thereby can start converter 20.
Fig. 4 is the structure chart of of the present invention 5th execution mode corresponding with claim 6.This execution mode is in the execution mode of Fig. 3, from the mode of direct current splenium 40 to control circuit 25 supply powers of converter 20.In addition, symbol a, the b that is marked on the control circuit 25 of Fig. 4 represents power supply terminal.
Electric power system is in operation process, and under either party situation about breaking down that also comprises converter 20 or DC power supply 50, the voltage of direct current splenium 40 keeps always can supply load 30 electric power.Therefore, by obtaining the consumption electric power (power supply) of the control circuit 25 of converters 20 from direct current splenium 40,, not only can make control circuit 25 runnings of converter 20, can also improve the reliability of system comprising when breaking down.
In addition, as described in present embodiment,, also go for the execution mode of Fig. 1, Fig. 2 from the method for direct current splenium 40 to control circuit 25 supply powers of converter 20.
Fig. 5 is the structure chart of of the present invention 6th execution mode corresponding with claim 7.This execution mode is provided with stabilizing circuit 27 in the control circuit 26 of converter 20, supply with the voltage of direct current splenium 40 by its power supply terminal a, b, uses from certain DC power supply voltage of stabilizing circuit 27 outputs power supply as control circuit 26.
Herein, stabilizing circuit 27 is switching regulator formations such as (regulator) of still exporting certain direct voltage during by the input direct voltage change.
For example, in the execution mode of Fig. 4, DC power supply 50 fault that is short-circuited, and converter 20 is under the state that stops, if thereby generator 10 produces non-loaded induced voltage by drive source rotation, the voltage that then is transformed behind the backflow diode rectification in the device 20 is added in direct current splenium 40 by diode 70P, 70N.At this moment, the electric current of inflow DC power supply 50 is stoped by diode 80P, 80N.
Herein, if the rotary speed of generator 10 is lower, the non-loaded induced voltage numerical value that then depends on this rotary speed also becomes lower, and the value of the voltage of direct current splenium 40 during also than normal operation is low.Therefore, if the voltage of the direct current splenium 40 during with normal operation as supply voltage, and the control circuit 25 in the pie graph 4 then can't guarantee the normal operation of control circuit 25, converter 20 also can't normally start.
Therefore, as shown in Figure 5, if add the voltage of direct current splenium 40 at stabilizing circuit 27, make its input voltage boost to setting and make it stable, thereby in the supply control circuit 26, then control circuit 26 can normal operation, converter 20 also can normally start.Afterwards, because can control change device 20, therefore,, make the generation power of generator 10 be transformed to direct current power, and the boost in voltage that makes direct current splenium 40 be to setting, thereby can runs well by the running of switch element.
In above-mentioned each execution mode,, capacitor and the direct current splenium 40 represented among the figure are not connected in parallel for the voltage that makes direct current splenium 40 is in stable state all the time.In addition, even if the input side of load 30 and capacitor are connected in parallel, also can obtain same effect.
Below, Fig. 6 is the structure chart of of the present invention 7th execution mode corresponding with claim 8.In Fig. 6, the inscape mark identical sequence number identical with the conventional art of aforementioned each execution mode and Figure 13.In addition, 20A represents the converter that is made of thyristor 21 and backflow diode 22.
In this embodiment, be connected with voltage smmothing capacitor 41 between the both positive and negative polarity of direct current splenium 40.Since DC power supply 50 by diode bridge to the AC supply voltage rectification, thereby obtain direct voltage, therefore,, need to be equipped with voltage smmothing capacitor 41 for the corrugated smoothization that rectification is produced.Generally, the electrolytic capacitor that many applying units volume capacity is bigger is used for this purpose, because the general capacity of electrolytic capacitor is bigger, therefore, it also has following function, promptly under the situation that AC power has a power failure, by the electric charge accumulated to the load supply capability.
On the other hand, between the both positive and negative polarity of the lead-out terminal of converter 20A, connecting buffer condenser 28.The purpose that this buffer condenser 28 is set is, prevents that owing to the switching manipulation of converter 20A and the influence of wiring inductance, excessive voltage is applied on the switch element 21 that constitutes converter 20A.Generally, the film capacitor of use excellent in high-frequency characteristics or QP capacitor etc. are used for this purposes.
In addition, generator 10 carries out generating operation with converter 20A, in other words, continuously flow under the state of direct current splenium 40 from converter 20A at electric current, the diode 70P, the 70N that are arranged between converter 20A and the direct current splenium 40 connect, and voltage smmothing capacitor 41 becomes with the voltage of buffer condenser 28 and equates.
By above-mentioned this structure,, still can prevent switch element 21 because the overheated and instantaneous damage of overcurrent even the last underarm of converter 20A is under the state of unlatching simultaneously owing to misoperation.In other words, as common converter, when connecting between the both positive and negative polarity of dc output end under the situation of jumbo voltage smmothing capacitor, if make the last underarm of converter be in unlatching simultaneously, then the voltage smmothing capacitor is short-circuited, therefore, overcurrent is instantaneous to be flow through switch element and makes it overheated, thereby causes its damage.
But, in the present embodiment, even the last underarm of converter 20A is in opening simultaneously, what be short-circuited only is the buffer condenser 28 of low capacity, because jumbo voltage smmothing capacitor 41 is disconnected by diode 70P, 70N, therefore, overcurrent can be by the switch element 21 of converter 20A.
So according to present embodiment, even because the last underarm of converter 20A is in opening simultaneously, and switch element 21 can instantaneously not damage yet, therefore, it can improve the reliability of system.
Fig. 7 is the structure chart of of the present invention 8th execution mode corresponding with claim 9.
The structure of the main circuit of the electric power system in this execution mode is identical with Fig. 6, and in the present embodiment, the control circuit 90 of converter 20A has following feature.
On the other hand, when the voltage detecting value of direct current splenium 40 (voltage smmothing capacitor 41) when setting is above, overvoltage judging part 92 judges that it is an overvoltage.So, judged that it is under the superpotential situation, the running of converter 20A is stopped, and carry out processing such as generation outage operation.
Herein, dynamo current or energy output control part 91 are controlled according to the lead-out terminal voltage of converter 20A, and overvoltage judging part 92 is controlled according to the voltage of direct current splenium 40, and its reason is as follows.
At first, by the effect of diode 70P, 70N, it is lower than the lead-out terminal voltage of converter 20A that the voltage of direct current splenium 40 becomes sometimes, otherwise then unlikely.So, if dynamo current or energy output control part 91 are controlled according to the voltage of direct current splenium 40, then under the situation of voltage greater than desired value of direct current splenium 40, for reducing this voltage, set energy output for negative, in other words, the energy output that will transmit electric power from converter 20A side direction generator 10 and even the command value of dynamo current are set at negative.But, in the case because the effect by diode 70P, 70N, can't be from direct current splenium 40 to converter 20A supply capability, therefore, only from buffering capacitor 28 to generator 10 supply capabilities.But because the capacity of buffer condenser 28 is originally just little, therefore, its voltage sharply descends, and can't guarantee the operation of converter 20A.
For fear of above-mentioned situation takes place, as shown in Figure 7, as long as control energy output according to the lead-out terminal voltage of converter 20A.Like this, the voltage of buffer condenser 28 is retained as desired value, even and under the temporary transient situation about rising of the voltage of direct current splenium 40, because load 30 and control circuit 90 consume electric power, thereby voltage can descend slowly, and final consistent with the voltage of buffer condenser 28.
On the other hand, if the lead-out terminal voltage according to converter 20A carries out superpotential judgement, even have only the voltage of direct current splenium 40 to uprise so, also can't detect, the worst situation is that it becomes overvoltage, thus the diode bridge in disintegration voltage smmothing capacitor 41 and the DC power supply 50.And if carry out superpotential judgement according to the voltage of direct current splenium 40, then can address this is that.
In addition, Fig. 8 is the calcspar of the structure of aforementioned dynamo current or energy output control part 91.
In other words, calculate the deviation of detected voltage and desired value by calculator 911, and make in its input regulator 912, simultaneously, with the output of adjuster 912 as the command value of sending to converter 20A (dynamo current command value or energy output command value), converter 20A controls generator 10 according to this command value, thereby produces direct current at the lead-out terminal of converter 20A.From above-mentioned direct current, deduct DC load electric current electric current afterwards by calculator 913 and flow into buffer condenser 28, the voltage of buffer condenser 28 is changed.In addition, the 914th, eliminate the wave filter of making an uproar of noise from the output voltage detected value (the voltage detecting value of buffer condenser 28) of converter 20A, the voltage detecting value by this filter 914 is transfused in the aforementioned calculator 911.
Under the situation of situation that diode 70P, 70N connect and non-connection, must be noted that the gain of capacitor has than the big-difference this point herein.
In other words, be in as diode 70P, 70N under the situation of connection, the condenser capacity of seeing from converter 20A one side is the big capacity that comprises voltage smmothing capacitor 41, be under the situation of non-connection (the lead-out terminal voltage of the voltage of direct current splenium 40＞converter 20A) and work as diode 70P, 70N, the condenser capacity of seeing from converter 20A one side only is the low capacity of buffer condenser 28.
Therefore, the lead-out terminal voltage of converter 20A is for the change of the identical direct current generation of converter 20A output, and is less when diode 70P, 70N connect, bigger when non-connection.
This situation can be called the gain of capacitor, and the former is less, and the latter is bigger.In other words, if set the gain of adjuster 912 in advance when connecting, then control system will become unstable when non-connection.
In order to prevent the problems referred to above, for example can be in the following ways.Detect the on-state of diode 70P, 70N by any method, perhaps directly compare the voltage of direct current splenium 40 and the lead-out terminal voltage of converter 20A, be in as diode 70P, 70N under the situation of non-connection, reduce the gain of adjuster 912.
Secondly, Fig. 9 is the structure chart of of the present invention 9th execution mode corresponding with claim 10, and Figure 10 is the dynamo current in the control circuit 90A or the structure calcspar of energy output control part 91A among Fig. 9.
In this embodiment, only detect the voltage of direct current splenium 40, control and the overvoltage of utilizing this voltage detecting value to carry out dynamo current or energy output are judged.Like this, owing to use single voltage detector to get final product, therefore, can realize low cost and simplified system.
As the operation of this execution mode, the operation of overvoltage judging part 92 is identical with the 8th execution mode, still, and the operation difference of generator flow or energy output control part 91A.
In the present embodiment, the voltage detecting value of direct current splenium 40 is used to control generator flow or energy output, therefore, as previously mentioned, when the voltage of direct current splenium 40 during greater than desired value, then can have problems.As the method that addresses this problem, often generate electricity by making generator 10, to direct current splenium 40 supply capabilities, diode 70P, 70N are in all the time that on-state gets final product from converter 20A.For this reason, as shown in figure 10, as long as energy output lower limit amplitude limiter 915 is set, the energy output command value that adjuster 912 is exported is set at always and gets final product (non-negative) more than zero.In addition, when adjuster 912 is output as the dynamo current command value, be non-negative current instruction value as long as set consequently resulting energy output.
By said structure, because can not continuing to become, the lead-out terminal voltage (voltage of buffer condenser 28) of converter 20A is not lower than the voltage of direct current splenium 40, therefore, the problem of aforesaid control aspect is just solved.
In addition, under DC load 30 for non-loaded energy output is positive situation, because the electric power of carrying to direct current splenium 40 from converter 20A is not consumed, therefore, the rising that continues of the voltage of voltage smmothing capacitor 41.Can explain this situation with reference to Figure 10, " DC load electric current " is zero, and the direct current that converter 20A is exported is under the positive situation, continues to raise as the voltage of the voltage smmothing capacitor 41 of integral element.
In this case, owing to the overvoltage of direct current splenium 40 is all judged according to overvoltage judging part 92, therefore on this time point,, converter 20A solves problem by being shut down.But, in reaching overvoltage judging part 92 before the overvoltage criterion, desire to stop under the situation that the voltage of direct current splenium 40 rises, set in advance another overvoltage criterion, when the voltage detecting value of direct current splenium 40 reaches under the situation of this overvoltage criterion, as long as the running of the device 20A that stops transformation.
In addition, when the minimum consumption electric power that has determined DC load 30, and the lower limit that sets in advance energy output then can not produce the problems referred to above when not reaching this minimum consumption electric power.
Figure 11 is the structure chart of of the present invention 10th execution mode corresponding with claim 11.
In this embodiment, have only between lead-out terminal positive and negative of voltage smmothing capacitor 41 and converter 20A and be connected.
According to present embodiment, the impulse current control circuit when then not needing to connect needed AC power in the general structure.In other words, AC power is carried out be connected with jumbo voltage smmothing capacitor usually on the lead-out terminal of the diode bridge in the DC power supply 50 of rectification.In this case, in order to prevent to connect AC power, overcurrent is inserted the impulse current control circuit from the unexpected surge voltage smmothing capacitor of AC power between diode bridge and voltage smmothing capacitor.This impulse current control circuit constitutes the switch element of resistive short by resistance, charging after finishing.
And on the other hand, if structure shown in Figure 11, then voltage smmothing capacitor 41 is connected with converter 20A and away from diode 70P, 70N, even therefore connect AC power, the effect impulse current by diode 70P, 70N can not flow to capacitor 41 yet.So, just do not need the impulse current control circuit yet.
As mentioned above, according to present embodiment, owing to do not need the impulse current control circuit, therefore, miniaturization, cost degradation that can implement device and reduce the part that may break down and improve reliability.
In addition, in the present embodiment, as the voltage detecting value that is used for overvoltage judgement, dynamo current or energy output control, all can use the lead-out terminal voltage detecting value of converter 20A, by the on/off of diode 70P, 70N, the stability of control system does not have bigger variation yet.
In above-mentioned each execution mode,, use three-phase inverter to be illustrated, but the present invention is not limited to these as the situation of converter 20 or 20A at using the three-phase alternating current machine as generator 10.
For example, the present invention also can be applicable to and use DC generator as generator, use the situation of copped wave (chopper) circuit as converter.In addition, using under the situation of AC machine as generator, its number of phases also is an arbitrary value.In addition, the number of phases and its structure for according to the converter of generator as long as it is to export direct current with the output of generator as power converter, are not particularly limited.
Claims (8)
1. electric power system, possess generator, the DC power supply that will be connected with the outlet side of this converter, the load that is connected with described direct current splenium by this generator electricity force transformation converter that is direct current power, by the direct current splenium, it is characterized in that
The bridge architecture of described converter for a plurality of arms and described direct current splenium are connected in parallel and form, wherein this arm is made of a plurality of switch elements that are connected in series,
From described converter on the direction of described direct current splenium supply capability diode is connected positive side dc bus between described converter and the direct current splenium or minus side dc bus at least one on,
Supply with the power supply of the control circuit of described converter from described direct current splenium.
2. electric power system according to claim 1 is characterized in that,
Described generator has the exciting part that is made of electromagnet or permanent magnet.
3. electric power system according to claim 2 is characterized in that,
Utilization, is charged to the capacitor that is connected with the direct current outlet side of described converter by the backflow diode in the described converter because of the non-loaded induced voltage that the rotation of described generator produces.
4. in the electric power system according to claim 3, it is characterized in that,
Dc voltage conversion by making described direct current splenium is the stabilizing circuit of assigned voltage, supplies with the power supply of described control circuit.
5. electric power system according to claim 1 is characterized in that,
Connect buffer condenser between the both positive and negative polarity of the lead-out terminal of described converter, and, the voltage smmothing capacitor between the both positive and negative polarity of described direct current splenium, connected.
6. electric power system according to claim 5 is characterized in that,
Have control circuit, this control circuit carries out superpotential judgement according to the voltage of described direct current splenium, and controls the electric current or the energy output of described generator according to the VD of described converter.
7. electric power system according to claim 5 is characterized in that,
Have control circuit, electric current or energy output that this control circuit carries out superpotential judgement and controls described generator according to the direct voltage of described direct current splenium, and control described converter so that described energy output for negative.
8. electric power system according to claim 1 is characterized in that,
Between the both positive and negative polarity of the lead-out terminal of described converter, connect the voltage smmothing capacitor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004158548 | 2004-05-28 | ||
| JP2004158548 | 2004-05-28 | ||
| JP2004343864 | 2004-11-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1702936A CN1702936A (en) | 2005-11-30 |
| CN100386940C true CN100386940C (en) | 2008-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100734307A Expired - Fee Related CN100386940C (en) | 2004-05-28 | 2005-05-24 | Electric power system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6075024B2 (en) * | 2012-11-19 | 2017-02-08 | 富士電機株式会社 | Multi-level inverter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5319536A (en) * | 1991-12-17 | 1994-06-07 | International Business Machines Corporation | Power system for parallel operation of AC/DC convertrs |
| CN1118951A (en) * | 1994-08-24 | 1996-03-20 | 三菱电机株式会社 | Inverter apparatus |
| CN1121164A (en) * | 1994-07-01 | 1996-04-24 | 夏普公司 | Air conditioning device |
| US5768117A (en) * | 1993-12-27 | 1998-06-16 | Hitachi, Ltd. | Power supply system for supplying electric power to a load through plural converters |
| CN1405964A (en) * | 2001-09-14 | 2003-03-26 | 株式会社东芝 | Electric-power converter |
| JP2003161541A (en) * | 2001-09-13 | 2003-06-06 | Osaka Gas Co Ltd | Heat pump system |
-
2005
- 2005-05-24 CN CNB2005100734307A patent/CN100386940C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5319536A (en) * | 1991-12-17 | 1994-06-07 | International Business Machines Corporation | Power system for parallel operation of AC/DC convertrs |
| US5768117A (en) * | 1993-12-27 | 1998-06-16 | Hitachi, Ltd. | Power supply system for supplying electric power to a load through plural converters |
| CN1121164A (en) * | 1994-07-01 | 1996-04-24 | 夏普公司 | Air conditioning device |
| CN1118951A (en) * | 1994-08-24 | 1996-03-20 | 三菱电机株式会社 | Inverter apparatus |
| JP2003161541A (en) * | 2001-09-13 | 2003-06-06 | Osaka Gas Co Ltd | Heat pump system |
| CN1405964A (en) * | 2001-09-14 | 2003-03-26 | 株式会社东芝 | Electric-power converter |
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| CN1702936A (en) | 2005-11-30 |
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