CN105703354A - Electric energy quality regulator for direct current power system - Google Patents
Electric energy quality regulator for direct current power system Download PDFInfo
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- CN105703354A CN105703354A CN201610156623.7A CN201610156623A CN105703354A CN 105703354 A CN105703354 A CN 105703354A CN 201610156623 A CN201610156623 A CN 201610156623A CN 105703354 A CN105703354 A CN 105703354A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/02—Arrangements for reducing harmonics or ripples
Abstract
The invention provides an electric energy quality regulator for a direct current power system. When a harmonic current occurs on a direct current bus of the direct current power system, the harmonic current on the direct current bus can be filtered by the electric energy quality regulator for the hybrid direct current power system, or the when a harmonic voltage occurs on the direct current bus of the direct current power system, the harmonic voltage on the direct current bus can be filtered, and the direct current bus voltage and the current waveform can be smoothed by the electric energy quality regulator for the hybrid direct current power system; and therefore, harmonic isolation between a power supply side and a load side can be realized, and bidirectional flow of the harmonic waves between the power supply side and the load side can be prevented.
Description
Technical field
The present invention relates to electric power quality and regulate field, more particularly, to a kind of power quality conditioner for direct current power system。
Background technology
Along with the development of power system, shortcoming and the limitation of AC electric power systems become increasingly conspicuous。In transmission line of alternation current, also having the loss exchanging induction reactance except the resistance loss having wire, line loss is big, and remote conveying electrical efficiency is low。In transmission line of alternation current, any one phase generation permanent fault, it is necessary to having a power failure completely, breakdown loss is big。The necessary synchronous operation of ac transmission, the grid-connected concordance that it is also contemplated that phase place of AC system, control complexity。In ac distribution network, the restriction that ac transmission ability is subject between synchronous generator angle stability sex chromosome mosaicism, and along with the increase of transmission distance, contact reactance between synchrodrive increases, the phase place of electric current can produce significant phase contrast at the two ends of AC transmission system, stability problem is more prominent so that exchange power transmission and distribution ability is subject to bigger restriction。
The direct current power system corresponding with AC electric power systems is absent from stability problem, and switching is more prone to, and operational reliability is high；Will not producing line capacitance current loss during direct current transportation, power transmission efficiency is high；Carrying in same active power situation, DC distribution only has two power transmission lines of positive and negative polarities, and without kelvin effect, conductor cross-section utilizes fully, can save wire rod, tower material and line corridor, and transmission line capability is big, and fed distance is remote；The dielectric strength of dielectric is required lower than exchange, the small investment of direct current cables dielectric, it is suitable for the lower cable in sea and urban power distribution network cable power transmission。After adopting direct current power system, will no longer be required to the current conversion station of current HVDC Transmission Technology, cost is greatly lowered。Two aerial lines of direct current transportation are usually taken adjacent wire, and size of current is identical, in opposite direction, close proximity, and the magnetic field of generation almost can be completely counterbalanced by, and has environment-friendly advantage。Along with a large amount of distributed energies access power system, direct current power system is more convenient for the access of distributed energy。In user power utilization form, electrical equipment containing DC link increases in recent years, substantially uses the electrical equipment of direct current to increase, and after using DC distribution net, reduces the conversion process of electric energy, improves electric energy efficiency。Estimating in the near future, to develop further and perfect along with DC techniques, it is imperative that direct current power system is promoted, it will at field of power and AC electric power systems and deposit and even replace AC electric power systems。
Along with the development of society, the quality of power supply and power supply reliability are proposed increasingly higher requirement by modern electrical equipment。In AC electric power systems, people have taken up a series of FACTS device and apply to quality of power supply adjustment and the improvement of AC electric power systems。But current power quality adjusting device is all aimed at AC electric power systems design, is seldom related to research and the invention of the electric energy regulator aspect of direct current power system。Once direct current power system comes into operation, equally inevitably running into similar power quality problem, existing quality of power supply regulation technology and device substantially will cannot adapt to the requirement of direct current power system。
Summary of the invention
The present invention provides a kind of power quality conditioner for direct current power system, it is achieved the quality of power supply of direct current power system effectively regulates。
In order to reach above-mentioned technique effect, technical scheme is as follows:
A kind of power quality conditioner for direct current power system, including voltage and current signal collecting unit, it connects controller, for gathering busbar voltage and the current signal of direct current power system, sends controller to after this Signal Pretreatment；
Controller, it connects voltage and current signal collecting unit, parallel connection type compensator, series compensator and energy-storage units respectively, for receiving busbar voltage and the current signal of voltage and current signal collecting unit, it is analyzed this signal processing, produces corresponding control instruction and send parallel connection type compensator, series compensator and energy-storage units to；
For carrying out the parallel connection type compensator of current compensation, including a DC/DC reversible transducer and the first filter unit；DC/DC reversible transducer, it connects controller, DC energy storage unit and the first filter unit respectively, for receiving the control instruction of controller, cut-offfing of its own switch device is controlled under this instruction effect, export to power system thus the direct current energy that DC energy storage unit exports is adjusted to suitable compensation electric current, or send direct current energy unnecessary for power system to DC energy storage unit；Filter unit, two ports of its one end and a DC/DC reversible transducer are in parallel, and two ports of the other end are in parallel with dc bus, for being filtered processing by the DC current that DC/DC reversible transducer exports to DC energy storage unit；
For carrying out the series compensator of voltage compensation, including the 2nd DC/DC two-way changing and the second filter unit device；It connects controller, energy-storage units and filter unit respectively, for receiving the control instruction of controller, under this instruction effect, control cut-offfing thus the direct current energy that DC energy storage unit exports being adjusted to suitable bucking voltage and exporting to power system of its own switch device, or send direct current energy unnecessary for power system to energy-storage units；Filter unit, two ports of its one end and the 2nd DC/DC reversible transducer are in parallel, two ports of the other end are connected with dc bus, and are connected in parallel with a capacitor in this two series connections access point, for being filtered processing by the DC voltage that DC/DC reversible transducer exports to energy-storage units；
Energy-storage units, it connects the DC/DC reversible transducer of controller, the DC/DC reversible transducer of parallel connection type compensator and series compensator respectively, for receiving the control instruction of controller, under this instruction controls, receive the direct current energy of power system type compensator in parallel and series compensator output or type compensator and series compensator provide in parallel direct current energy to power system。
Further, described control instruction includes current compensation instruction, harmonic current compensation instruction, electric current are rapidly injected instruction, electric current control instruction, voltage compensation instruction, harmonic voltage compensating instruction and loop cut off instruction。
Further, described actuator also includes two two-way transformators of isolated form DC/DC, and the secondary of the two-way transformator of one of them isolated form DC/DC connects the first filter unit of parallel connection type compensator, former limit parallel connection direct bus；The secondary of the two-way transformator of another isolated form DC/DC connects the second filter unit of series compensator, former limit series direct current bus。
Compared with prior art, technical solution of the present invention provides the benefit that:
1, the present invention is in the application, when busbar voltage generation Voltage Drop or the rising of direct current power system, this mixed type power quality conditioner for direct current power system can be injected DC current to direct current power system within the Millisecond time or absorb DC current, within the Millisecond time, a DC voltage can also be provided to direct current power system simultaneously, the busbar voltage making direct current power system keeps constant or in certain allowed band, reaches the purpose of stable DC power system voltage；
2, the present invention is in the application, when the dc bus of direct current power system occurs harmonic current, this mixed type power quality conditioner for direct current power system can filter the harmonic current in dc bus, or when the dc bus of direct current power system occurs harmonic voltage, this mixed type straight-flow system electric energy regulator can filter dc bus harmonic voltage, smooth direct current busbar voltage and current waveform, realize the harmonic wave isolation between mains side and load side, stop harmonic wave two-way flow between；
3, the present invention is in the application, when there is open fault in direct current power system, this mixed type power quality conditioner for direct current power system can be instantaneous to direct current power system injection DC current in the very first time that open fault occurs, the operation of temporary transient support load in waiting back-up circuit handoff procedure, stabilize the fluctuation that handoff procedure causes simultaneously, realize load from fault loop to the smooth transfer of back-up circuit, it is prevented that the further expansion of open fault, advantageously reduce open fault loss；
4, the present invention is in the application, when carrying out mutual handoff procedure between direct current power system back-up circuit and major loop, this mixed type power quality conditioner for direct current power system is instantaneous to be injected to direct current power system or absorbs DC current, stabilize the fluctuation caused in back-up circuit and the mutual handoff procedure of major loop, it is achieved the smooth transfer of load；
5, the present invention is in the application, it is possible to achieve the maximum restriction effect by electric current to loop, conveniently direct current power system is controlled and management；
6, the present invention is in the application, when there is short trouble in direct current power system, the very first time insantaneous break loop that this mixed type straight-flow system electric energy regulator can occur at short trouble, fault big electric current during restriction direct current power system short circuit, be conducive to quickly excising fault, it is prevented that the further expansion of short trouble；
7, the present invention is in the application, and energy-storage system can provide for mixed type straight-flow system actuator or absorb straight-flow system energy；
8, the present invention is in the application, and switching tube can adopt the full-controlled device such as IGBT/IGCT/GTO, it is possible to achieve quickly open and shutoff, quick action；
9, the present invention is in the application, it may be achieved the two-way flow of energy between direct current power system and actuator；
10, the present invention is in the application, and the higher hamonic wave that switching tube produces is being filtered by filter unit, and direct current power system impact itself is less；
11, the present invention is in the application, if actuator adopts accesses direct current power system through isolation type bidirectional DC/DC transformator, it is possible to carry out flexibly and easily boosting and blood pressure lowering, it is achieved the access requirement of different electric pressures, it is simple to the parts selection of actuator and protection；The electrical isolation effect of actuator and direct current power system can also be realized simultaneously。
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is parallel connection type compensator structure schematic diagram；
Fig. 3 is series compensator structural representation；
Fig. 4 is the electrical block diagram of the DC/DC reversible transducer 1 and 2 of example；
Fig. 5 is the DC energy storage unit structural representation of example；
Fig. 6 is the electrical block diagram of the wave filter 3 and 4 of example；
Fig. 7 is the schematic diagram that the present invention is directly accessed direct current power system；
Fig. 8 is that the present invention accesses the schematic diagram of direct current power system through isolated form DC/DC transformator；
Fig. 9 is the schematic diagram of the isolated form DC/DC transformator used in the present invention。
Detailed description of the invention
Accompanying drawing being merely cited for property explanation, it is impossible to be interpreted as the restriction to this patent；
In order to the present embodiment is better described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product；
To those skilled in the art, in accompanying drawing, some known features and explanation thereof are likely to omission and will be understood by。
Below in conjunction with drawings and Examples, technical scheme is described further。
Embodiment 1
A kind of power quality conditioner for direct current power system provided by the invention, its electrical block diagram such as Fig. 1 shows, including: parallel connection type compensator, series compensator, energy-storage units, voltage and current signal collecting unit and controller；Voltage and current signal collecting unit connects controller, controller connects the 2nd DC/DC reversible transducer 2 and energy-storage units of a DC/DC reversible transducer 1 of parallel connection type compensator, series compensator respectively, oneth DC/DC reversible transducer 1 of parallel connection type compensator connects the first filter unit 3 and energy-storage units respectively, and the 2nd DC/DC reversible transducer 2 of series compensator connects second respectively and connects filter unit 4 and energy-storage units。More particularly, oneth DC/DC reversible transducer 1 of parallel connection type compensator is connected with the first filter unit 3 by two DC port i and j, oneth DC/DC reversible transducer 1 of parallel connection type compensator is connected with energy-storage units by two other DC port c and d, as shown in Figure 2；2nd DC/DC reversible transducer 2 of series compensator is connected with the second filter unit 4 by two DC port m and n, 2nd DC/DC reversible transducer 2 of series compensator is connected with energy-storage units by two other DC port e and f, as shown in Figure 3。
Voltage and current signal collecting unit, for gathering busbar voltage and the current signal of direct current power system, sends controller to after this Signal Pretreatment。
Controller receives busbar voltage and the current signal of voltage and current signal collecting unit, it is analyzed this signal processing, producing corresponding control instruction and send the 2nd DC/DC reversible transducer 2 and energy-storage units of a DC/DC reversible transducer 1 of parallel connection type compensator, series compensator to, detailed process is as follows:
When dc bus occurring, DC voltage falls or rises, for keeping DC bus-bar voltage constant or maintaining set-point, controller produces corresponding current compensation instruction and sends DC/DC reversible transducer 1 and an energy-storage units of parallel connection type compensator to, and controller produces corresponding voltage compensation instruction and sends the 2nd DC/DC reversible transducer 2 and energy-storage units of series compensator to simultaneously；
When occurring harmonic current on dc bus, for offsetting the harmonic current transmission between harmonic current and insulating power supply side and load side, controller produces harmonic current compensation instruction and sends DC/DC reversible transducer 1 and an energy-storage units of parallel connection type compensator to；
When dc bus occurs harmonic voltage, harmonic voltage for counteracting harmonic voltage, smooth dc voltage waveform and insulating power supply side with load side transmits, and controller produces harmonic voltage compensating instruction and sends the 2nd DC/DC reversible transducer 2 and energy-storage units of series compensator to；
When DC bus-bar voltage and electric current show that open fault occurs in direct current power system, controller produces electric current and is rapidly injected instruction and sends DC/DC reversible transducer 1 and an energy-storage units of parallel connection type compensator to；
When DC bus-bar voltage and electric current show that loop switch action occurs in direct current power system, controller produces corresponding current compensation instruction and sends DC/DC reversible transducer 1 and an energy-storage units of parallel connection type compensator to；
When DC bus current occurs more than limit value, controller produces corresponding electric current control instruction and transmits the 2nd DC/DC reversible transducer 2 and energy-storage units of series compensator。
When DC bus-bar voltage and electric current show that short trouble occurs in direct current power system, controller produces loop and cuts off instruction and send the 2nd DC/DC reversible transducer 2 of series compensator to。
Oneth DC/DC reversible transducer 1 of parallel connection type compensator and the 2nd DC/DC reversible transducer 2 of series compensator are for receiving the control instruction of controller, cut-offfing of switching device is controlled under this instruction effect, there is provided DC energy for dc bus or absorb DC energy from dc bus, send energy-storage units to by the direct current energy that power system is unnecessary or the direct current energy of energy-storage units is compensated to power system, thus stablizing smooth direct current electrical system bus voltage and current waveform, filter direct current power system current harmonics and voltage harmonic, or it is rapidly injected electric current when open fault occurs temporarily to support straight-flow system, or the fluctuation in loop switch process is stabilized when loop switch, or fast shut-off loop during short trouble occurs, or control the maximum of series loop passes through electric current, reach to regulate the purpose of the direct current power system quality of power supply。Oneth DC/DC reversible transducer 1 of parallel connection type compensator and the 2nd DC/DC reversible transducer 2 of series compensator all can adopt the topological structure such as two level, three level and many level, implement various ways, Fig. 4 gives a kind of concrete circuit structure, and the switching tube in circuit can adopt the full-controlled device such as IGBT/IGCT/GTO。
Energy-storage units, for receiving the control instruction of controller, receives the direct current energy of the DC/DC reversible transducer 1 of parallel connection type compensator and DC/DC reversible transducer 2 output of series compensator under this instruction controls or provides direct current energy to a DC/DC reversible transducer 1 of parallel connection type compensator and the 2nd DC/DC reversible transducer 2 of series compensator。Energy-storage units can adopt the energy storage modes such as accumulator, ultracapacitor, flywheel energy storage, superconducting energy storage。Fig. 5 gives the energy-storage units structure chart based on ultracapacitor energy storage mode, and in bank of super capacitors, normal storing electricity is set to the half of active volume, make maximum chargeable, discharge capacity is equal。
Filter unit is for being filtered processing to the DC voltage of the 2nd DC/DC reversible transducer 2 output of the DC current of DC/DC reversible transducer 1 output of energy-storage units type compensator in parallel and series compensator, with filtering clutter。As shown in Figure 6, the electric capacity C of filter unit is connected in parallel on the outlet line of DC/DC reversible transducer the structure of filter unit, the effect of electric capacity be stabilization transform device output voltage。Inductance L is connected on the outlet line of DC/DC reversible transducer, for filtering the output harmonic wave of electric energy regulator。
Mixed type direct current power system actuator of the present invention has the mode of two kinds of access direct current power systems:
The first is the access way being directly accessed direct current power system, namely the filter unit 3 of parallel connection type compensator is directly in parallel with dc bus by port a and b, the filter unit 4 of series compensator is directly connected with dc bus by port g and h, and it is connected in parallel with a capacitor C1 in series connection access point, as shown in Figure 7；
The second is through the two-way transformator access way of isolated form DC/DC, namely the filter unit 3 of parallel connection type compensator is connected by the secondary of the two-way transformator 1 of port a and b and isolated form DC/DC, the former limit of the two-way transformator of isolated form DC/DC 1 is in parallel with dc bus by two port p and q, the filter unit 4 of series compensator is connected by the secondary of the two-way transformator 2 of port g and h and isolated form DC/DC, connected with dc bus by two port r and s in the former limit of the two-way transformator of isolated form DC/DC 2, and it is connected in parallel with a capacitor C1 in two series connection access points, as shown in Figure 8。Adopt and access direct current power system through isolation type bidirectional DC/DC transformator, flexibly and easily the output of actuator can be boosted and blood pressure lowering, realize the access requirement of different electric pressure, the electrical isolation effect of actuator and direct current power system can also be realized simultaneously。The two-way transformator of isolated form DC/DC in embodiment is made up of single-phase full-bridge inverter, intermediate-frequency transformer and single-phase full bridge commutator three part, as shown in Figure 9。The Main Function of the two-way transformator of isolated form DC/DC is that the HVDC Modulation of input stage is become intermediate frequency square-wave signal, through intermediate-frequency transformer transformation and after being coupled to assistant formula reconvert become direct current, this voltage transformation process is reversible。Intermediate-frequency transformer can isolate current potential, plays the effect of voltage of transformation and power adjustment。
The work process of the present invention particularly as follows:
Voltage and current signal collecting unit gathers the voltage and current signal of dc bus；
When dc bus occurring, DC voltage falls or rises, controller produces corresponding current compensation instruction and transmits DC/DC reversible transducer 1 and a DC energy storage unit of parallel connection type compensator, produces corresponding voltage compensation instruction simultaneously and transmits the 2nd DC/DC reversible transducer 2 and DC energy storage unit of series compensator；If DC voltage falls, energy-storage units is to DC/DC reversible transducer 1 DC power output of parallel connection type compensator, the DC/DC reversible transducer 1 of parallel connection type compensator carries out cut-offfing accordingly of switching device under current compensation instruction effect, export to power system the direct current energy that DC energy storage unit exports being adjusted to suitable compensation electric current, simultaneously energy-storage units is to the 2nd DC/DC reversible transducer 2 DC power output of series compensator, 2nd DC/DC reversible transducer 2 of series compensator carries out cut-offfing accordingly of switching device under voltage compensation instruction effect, export to power system so that the direct current energy that DC energy storage unit exports is adjusted to suitable bucking voltage；If DC voltage rises, oneth DC/DC reversible transducer 1 of parallel connection type compensator carries out cut-offfing accordingly of switching device under current compensation instruction effect, 2nd DC/DC reversible transducer 2 of series compensator carries out cut-offfing accordingly of switching device under voltage compensation instruction effect, to send direct current energy unnecessary for power system to energy-storage units, energy-storage units stores the direct current energy that this is unnecessary；
When occurring harmonic current on dc bus, controller produces corresponding harmonic current compensation instruction and transmits DC/DC reversible transducer 1 and a DC energy storage unit of parallel connection type compensator；If harmonic current compensation instruction is just, energy-storage units is to DC/DC reversible transducer 1 DC power output of parallel connection type compensator, oneth DC/DC reversible transducer 1 of parallel connection type compensator carries out cut-offfing accordingly of switching device under harmonic current compensation instruction effect, exports to power system so that the direct current energy that DC energy storage unit exports to be adjusted to suitable compensation electric current；If harmonic current compensation instruction is negative, oneth DC/DC reversible transducer 1 of parallel connection type compensator carries out cut-offfing accordingly of switching device under harmonic current compensation instruction effect, to send direct current energy unnecessary for power system to energy-storage units, energy-storage units stores this direct current energy；
When DC bus-bar voltage and electric current show that open fault occurs in direct current power system, controller produces electric current and is rapidly injected instruction and sends DC/DC reversible transducer 1 and an energy-storage units of parallel connection type compensator to, energy-storage units is to a quick DC power output of DC/DC reversible transducer 1 of parallel connection type compensator, the cut-offfing of switching device of the oneth DC/DC reversible transducer 1 of the very first time Instantaneous Control parallel connection type compensator that the oneth DC/DC reversible transducer 1 of parallel connection type compensator is rapidly injected under instruction effect to occur at open fault at electric current, so that the direct current energy that DC energy storage unit exports is exported to power system；
When DC bus-bar voltage and electric current show that direct current power system carries out loop switch operation, controller produces current compensation instruction and sends DC/DC reversible transducer 1 and a DC energy storage unit of parallel connection type compensator to；If causing falling of DC voltage during loop switch, energy-storage units is to DC/DC reversible transducer 1 DC power output of parallel connection type compensator, oneth DC/DC reversible transducer 1 of parallel connection type compensator carries out cut-offfing accordingly of switching device under current compensation instruction effect, exports to power system so that the direct current energy that DC energy storage unit exports to be adjusted to suitable compensation electric current；If causing jumping of DC voltage during loop switch, oneth DC/DC reversible transducer 1 of parallel connection type compensator carries out cut-offfing accordingly of switching device under current compensation instruction effect, to send direct current energy unnecessary for power system to energy-storage units, energy-storage units stores the direct current energy that this is unnecessary；
When DC current occurs more than limit value, controller produces corresponding electric current control instruction and transmits the 2nd DC/DC reversible transducer 2 and DC energy storage unit of series compensator, energy-storage units reduces the direct current energy of the 2nd DC/DC reversible transducer 2 output to series compensator, 2nd DC/DC reversible transducer 2 of series compensator carries out cut-offfing accordingly of switching device under electric current control instruction effect, controls the size of DC current；Or the 2nd DC/DC reversible transducer 2 of series compensator carries out cut-offfing accordingly of switching device under electric current control instruction effect, to send direct current energy unnecessary for power system to energy-storage units, the direct current energy that 2nd DC/DC reversible transducer 2 of energy-storage units storage series compensator sends, thus controlling the size of DC current；
When occurring harmonic voltage on dc bus, controller produces corresponding harmonic voltage compensating instruction and transmits the 2nd DC/DC reversible transducer 2 and DC energy storage unit of series compensator；If harmonic voltage compensating instruction is just, energy-storage units is to the 2nd DC/DC reversible transducer 2 DC power output of series compensator, 2nd DC/DC reversible transducer 2 of series compensator carries out cut-offfing accordingly of switching device under harmonic voltage compensating instruction effect, exports to power system so that the direct current energy that DC energy storage unit exports is adjusted to suitable bucking voltage；If harmonic voltage compensating instruction is negative, 2nd DC/DC reversible transducer 2 of series compensator carries out cut-offfing accordingly of switching device under voltage compensation instruction effect, to send direct current energy unnecessary for power system to energy-storage units, energy-storage units stores this direct current energy。
When DC bus-bar voltage and electric current show that short trouble occurs in direct current power system, controller produces loop and cuts off instruction and send the 2nd DC/DC reversible transducer 2 of series compensator to, and the 2nd DC/DC reversible transducer 2 of series compensator controls switching device and turns off with insantaneous break loop。
The corresponding same or analogous parts of same or analogous label；
Position relationship described in accompanying drawing be used for the explanation of being merely cited for property, it is impossible to be interpreted as the restriction to this patent；
Obviously, the above embodiment of the present invention is only for clearly demonstrating example of the present invention, and is not the restriction to embodiments of the present invention。For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description。Here without also cannot all of embodiment be given exhaustive。All any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within the protection domain of the claims in the present invention。
Claims (3)
1. a power quality conditioner for direct current power system, it is characterised in that include voltage and current signal collecting unit, it connects controller, for gathering busbar voltage and the current signal of direct current power system, sends controller to after this Signal Pretreatment；
Controller, it connects voltage and current signal collecting unit, parallel connection type compensator, series compensator and energy-storage units respectively, for receiving busbar voltage and the current signal of voltage and current signal collecting unit, it is analyzed this signal processing, produces corresponding control instruction and send parallel connection type compensator, series compensator and energy-storage units to；
For carrying out the parallel connection type compensator of current compensation, including a DC/DC reversible transducer and the first filter unit；DC/DC reversible transducer, it connects controller, DC energy storage unit and the first filter unit respectively, for receiving the control instruction of controller, cut-offfing of its own switch device is controlled under this instruction effect, export to power system thus the direct current energy that DC energy storage unit exports is adjusted to suitable compensation electric current, or send direct current energy unnecessary for power system to DC energy storage unit；Filter unit, two ports of its one end and a DC/DC reversible transducer are in parallel, and two ports of the other end are in parallel with dc bus, for being filtered processing by the DC current that DC/DC reversible transducer exports to DC energy storage unit；
For carrying out the series compensator of voltage compensation, including the 2nd DC/DC two-way changing and the second filter unit device；It connects controller, energy-storage units and filter unit respectively, for receiving the control instruction of controller, under this instruction effect, control cut-offfing thus the direct current energy that DC energy storage unit exports being adjusted to suitable bucking voltage and exporting to power system of its own switch device, or send direct current energy unnecessary for power system to energy-storage units；Filter unit, two ports of its one end and the 2nd DC/DC reversible transducer are in parallel, two ports of the other end are connected with dc bus, and are connected in parallel with a capacitor in this two series connections access point, for being filtered processing by the DC voltage that DC/DC reversible transducer exports to energy-storage units；
Energy-storage units, it connects the DC/DC reversible transducer of controller, the DC/DC reversible transducer of parallel connection type compensator and series compensator respectively, for receiving the control instruction of controller, under this instruction controls, receive the direct current energy of power system type compensator in parallel and series compensator output or type compensator and series compensator provide in parallel direct current energy to power system。
2. power quality conditioner for direct current power system according to claim 1, it is characterized in that, described control instruction includes current compensation instruction, harmonic current compensation instruction, electric current are rapidly injected instruction, electric current control instruction, voltage compensation instruction, harmonic voltage compensating instruction and loop cut off instruction。
3. power quality conditioner for direct current power system according to claim 1, it is characterized in that, described actuator also includes two two-way transformators of isolated form DC/DC, the secondary of the two-way transformator of one of them isolated form DC/DC connects the first filter unit of parallel connection type compensator, former limit parallel connection direct bus；The secondary of the two-way transformator of another isolated form DC/DC connects the second filter unit of series compensator, former limit series direct current bus。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113949048A (en) * | 2021-10-18 | 2022-01-18 | 南方电网电力科技股份有限公司 | Direct-current microgrid fault current controller and control method thereof |
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| CN102832611A (en) * | 2012-08-29 | 2012-12-19 | 华中科技大学 | Parallel-form power quality conditioner for direct current power system |
| CN102832612A (en) * | 2012-08-29 | 2012-12-19 | 华中科技大学 | Hybrid power quality conditioner for direct current power system |
| CN103151792A (en) * | 2013-03-15 | 2013-06-12 | 西安杰能电力科技股份有限公司 | Harmonic current suppression device for ultrahigh-voltage direct current power transmission system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113949048A (en) * | 2021-10-18 | 2022-01-18 | 南方电网电力科技股份有限公司 | Direct-current microgrid fault current controller and control method thereof |
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