CN102810857B - Power quality regulator for series direct current power system - Google Patents
Power quality regulator for series direct current power system Download PDFInfo
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- CN102810857B CN102810857B CN201210234664.5A CN201210234664A CN102810857B CN 102810857 B CN102810857 B CN 102810857B CN 201210234664 A CN201210234664 A CN 201210234664A CN 102810857 B CN102810857 B CN 102810857B
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Abstract
The invention provides a power quality regulator for a series direct current power system. The power quality regulator comprises a bidirectional direct current/direct current (DC/DC) converter, a direct current energy storage unit, a filtering unit, a voltage and current signal acquisition unit and a controller, wherein the voltage and current signal acquisition unit is connected with the controller which is connected with the bidirectional DC/DC converter and the energy storage unit respectively; and the bidirectional DC/DC converter is connected with the filtering unit and the energy storage unit respectively. A switching device of the bidirectional DC/DC converter is controlled by the controller to be turned on and off to regulate direct current electric energy output by the direct current energy storage unit into proper compensation voltage for output to the direct current power system or to transmit the redundant direct current electric energy of the direct current power system to the energy storage unit, so that the bus voltage of the direct current power system is stabilized and smoothened, maximum passing current of a series loop is controlled, and the loop is quickly switched off under a short-current failure condition to fulfill the aim of regulating the power quality of the direct current power system.
Description
Technical field
The invention belongs to direct current power system field, be specifically related to a kind of tandem type direct current system electric energy regulator, regulate in order to the quality of power supply that realizes direct current power system.
Background technology
Along with the development of electric power system, shortcoming and the limitation of AC electric power systems become increasingly conspicuous.In transmission line of alternation current, except having the resistance loss of wire, exchange in addition the loss of induction reactance, line loss is large, and remote conveying electrical efficiency is low.In transmission line of alternation current, any one there is permanent fault mutually, must have a power failure completely, and breakdown loss is large.The necessary synchronous operation of ac transmission, the grid-connected consistency that also will consider phase place of AC system, controls complicated.In ac distribution network, ac transmission ability is subject to the restriction of angle stability problem between synchronous generator, and along with the increase of transmission distance, contact reactance between synchronous motor increases, the phase place of electric current can produce significant phase difference at the two ends of AC transmission system, stability problem is more outstanding, makes to exchange power transmission and distribution ability and is subject to larger restriction.
The direct current power system corresponding with AC electric power systems be existence and stability problem not, and switching is more prone to, and operational reliability is high; When direct current transportation, can not produce line capacitance current loss, power transmission efficiency is high; Carry 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 utilization is abundant, can save wire rod, tower material and circuit corridor, and transmission line capability is large, and fed distance is far away; Require ratio to exchange to the dielectric strength of dielectric low, the small investment of direct current cables dielectric, is applicable to the lower cable in sea and urban power distribution network cable power transmission.Adopt after direct current power system, will no longer need the current conversion station of current HVDC Transmission Technology, cost significantly reduces.Two overhead wires of direct current transportation are taked adjacent wire conventionally, and size of current is identical, opposite direction, and close proximity, the magnetic field of generation almost can be offset completely, has environment-friendly advantage.Along with a large amount of distributed energy access electric power systems, direct current power system is more convenient for the access of distributed energy.In user power utilization form, the electrical equipment containing DC link increases in recent years, uses in essence 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.Estimate in the near future, along with DC techniques further develops and perfect, it is imperative that direct current power system is promoted, and will and deposit in field of power and AC electric power systems and even replace AC electric power systems.
Along with social development, modern power consumption equipment has proposed more and more higher requirement to the quality of power supply and power supply reliability.In AC electric power systems, the quality of power supply that people have taked a series of FACTS devices to apply to AC electric power systems regulates and administers.But current power quality adjusting device is all aimed at AC electric power systems design, seldom has research and invention about the electric energy regulator aspect of direct current power system.Once direct current power system comes into operation, equally inevitably can run into similar power quality problem, existing quality of power supply regulation technology and device cannot adapt to the requirement of direct current power system substantially.
Summary of the invention
The present invention proposes a kind of tandem type direct current system electric energy regulator, and the quality of power supply that realizes direct current power system effectively regulates.
A kind of tandem type direct current system electric energy regulator, comprises
Voltage and current signal collecting unit, it connects controller, for gathering busbar voltage and the current signal of direct current power system, to sending controller to after this Signal Pretreatment;
Controller, it connects respectively voltage and current signal collecting unit, DC/DC reversible transducer and DC energy storage unit, for busbar voltage and the current signal of receiver voltage current signal collecting unit, this signal is carried out to analyzing and processing, produce corresponding control command and send DC/DC reversible transducer and DC energy storage unit to;
DC energy storage unit, it connects respectively controller and DC/DC reversible transducer, for receiving the control command of controller, under this instruction control, receive the direct current energy that electric power system exports by DC/DC reversible transducer or provide direct current energy by DC/DC reversible transducer to electric power system;
DC/DC reversible transducer, it connects respectively controller, DC energy storage unit and filter unit, for receiving the control command of controller, the direct current energy of DC energy storage unit output is adjusted into suitable bucking voltage exports to electric power system thereby control cut-offfing of its own switch device under this instruction effect, or send direct current energy unnecessary electric power system to DC energy storage unit;
Filter unit, it connects DC/DC reversible transducer, carries out filtering processing for the direct voltage that DC energy storage unit is exported by DC/DC reversible transducer.
Further, described control command comprises that Current Control instruction, voltage compensation instruction, harmonic compensation instruction and loop cut off instruction.
Further, described adjuster also comprises the two-way transformer of isolated form DC/DC, and the secondary of the two-way transformer of isolated form DC/DC connects filter unit, and the former limit of the two-way transformer of isolated form DC/DC connects DC bus.
The present invention has following technique effect:
(1) the present invention is in application, in the time that the busbar voltage generation voltage of direct current power system falls or rises, this tandem type direct current system electric energy regulator can provide a direct voltage to direct current power system within the Millisecond time, make the busbar voltage of direct current power system keep constant or in certain allowed band, the object of stable DC power system voltage.
(2) the present invention is in application, in the time there is harmonic wave in the DC bus-bar voltage of direct current power system, this tandem type direct current system electric energy regulator can filtering DC bus-bar voltage harmonic wave, smooth direct current busbar voltage waveform, can also realize the harmonic wave isolation of mains side and load side, stop the two-way flow of harmonic wave between.
(3) the present invention is in application, can realize the maximum of series loop by the restriction of electric current, convenient direct current power system is controlled and managed.
(4) the present invention is in application, in the time there is short trouble in direct current power system, the very first time insantaneous break loop that this tandem type direct current system electric energy regulator can occur at short trouble, the large electric current of fault when the short circuit of restriction direct current power system, be conducive to excise fast fault, prevent the further expansion of short trouble.
(5) the present invention is in application, and energy-storage system can provide or absorb direct current system energy for tandem type direct current system adjuster.
(6) the present invention is in application, and switching tube can adopt the full control devices such as IGBT/IGCT/GTO, can realize and open fast and turn-off, quick action.
(7) the present invention, in application, can realize the two-way flow of energy between direct current power system and adjuster.
(8) the present invention is in application, and the high order harmonic component that switching tube produces is by filter unit filtering, less on direct current power system impact itself.
(9) the present invention, in application, if adjuster adopts through isolation type bidirectional DC/DC transformer access direct current power system, can be boosted and step-down flexibly and easily, realizes the access requirement of different electric pressures, is convenient to parts selection and the protection of adjuster; Can also realize the electrical isolation effect of adjuster and direct current power system simultaneously.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the tandem type DC/DC two-way changing electrical block diagram of example;
Fig. 3 is the DC energy storage unit structural representation of example;
Fig. 4 is the filter circuit configuration schematic diagram of example;
Fig. 5 is the schematic diagram that the present invention directly accesses direct current power system;
Fig. 6 is the schematic diagram of the present invention through isolated form DC/DC transformer access direct current power system;
Fig. 7 is the schematic diagram of the isolated form DC/DC transformer that uses in the present invention.
Embodiment
Below in conjunction with accompanying drawing and example, the present invention is described in more detail, and the structure in figure is all open, is not limited to structure drawn in figure.
A kind of tandem type direct current system electric energy regulator provided by the invention, its electrical block diagram as shown in Figure 1, comprising: DC/DC reversible transducer, DC energy storage unit, filter unit, voltage and current signal collecting unit and controller; Voltage and current signal collecting unit connects controller, and controller connects respectively DC/DC reversible transducer and energy-storage units, and DC/DC reversible transducer connects respectively filter unit and energy-storage units.More particularly, DC/DC reversible transducer is connected with filter unit with d by two DC port c, and DC/DC reversible transducer is connected with energy-storage units with f by two other DC port e.
Voltage and current signal collecting unit is for gathering busbar voltage and the current signal of direct current power system, to sending controller to after this Signal Pretreatment.
Busbar voltage and the current signal of controller receiver voltage current signal collecting unit, carry out analyzing and processing to this signal, produces corresponding control command and send DC/DC reversible transducer and energy-storage units to, and detailed process is as follows:
In the time occurring on DC bus that direct voltage falls or rises, for maintenance DC bus-bar voltage is constant or maintain set-point, controller produces corresponding voltage compensation instruction and sends DC/DC reversible transducer and energy-storage units to;
When occurring harmonic voltage on DC bus, for offsetting the harmonic propagation of harmonic voltage, smooth dc voltage waveform and insulating power supply side and load side, controller produces harmonic compensation instruction and sends DC/DC reversible transducer and energy-storage units to;
In the time that direct current occurs exceeding limit value, for controlling the size of direct current, controller produces corresponding Current Control instruction and transmits DC/DC reversible transducer and DC energy storage unit;
When DC bus-bar voltage and electric current show that short trouble appears in direct current power system, controller produces loop and cuts off instruction and send DC/DC reversible transducer to, with the shutoff of switching device of the very first time Instantaneous Control DC/DC reversible transducer that occurs at short trouble, insantaneous break loop, the large electric current of fault when the short circuit of restriction direct current power system, be conducive to excise fast fault, prevent the further expansion of short trouble.
DC/DC reversible transducer is for receiving the control command of controller, under this instruction effect, control switch device cut-offs, for DC bus provides DC energy or absorbs DC energy from DC bus, send energy-storage units to by the unnecessary direct current energy of electric power system or the direct current energy of energy-storage units is compensated to electric power system, thereby stablize smooth direct current electrical system bus voltage, or the maximum of controlling series loop is passed through electric current, or fast shut-off loop while there is short trouble, reach the object that regulates the direct current power system quality of power supply.DC/DC reversible transducer can adopt the topological structures such as two level, three level and many level, and specific implementation has various ways, and Fig. 2 has provided a kind of concrete circuit structure, and the switching tube in circuit can adopt the full control devices such as IGBT/IGCT/GTO.
Energy-storage units, for receiving the control command of controller, receives the direct current energy of DC/DC reversible transducer output or provides direct current energy to DC/DC reversible transducer under this instruction control.Energy-storage units can adopt the energy storage modes such as storage battery, ultracapacitor, flywheel energy storage, superconducting energy storage.Fig. 3 has provided 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, and maximum chargeable, discharge capacity is equated.
Filter unit carries out filtering processing for the direct current that energy-storage units is exported by DC/DC reversible transducer, with filtering clutter.As shown in Figure 4, the capacitor C of filter unit is connected in parallel on the outlet line of DC/DC reversible transducer the structure of filter unit, and inductance L is connected on the outlet line of DC/DC reversible transducer, for the output harmonic wave of filtering electric energy regulator.
Tandem type direct current system adjuster of the present invention has two kinds of modes that seal in direct current power system:
The first is directly to access the access way of direct current power system, and filter unit is directly connected with DC bus by port a and b, as shown in Figure 5;
The second is through the two-way transformer access way of isolated form DC/DC, be that filter unit passes through port a and b connects with the secondary of the two-way transformer of isolated form DC/DC, connect with DC bus by two port g and h in the former limit of the two-way transformer of isolated form DC/DC, as shown in Figure 6.Adopt through isolation type bidirectional DC/DC transformer access direct current power system, can boost and step-down to the output of adjuster flexibly and easily, realize the access requirement of different electric pressures, can also realize the electrical isolation effect of adjuster and direct current power system simultaneously.The two-way transformer of isolated form DC/DC in embodiment is made up of single-phase full-bridge inverter, intermediate frequency transformer and single-phase full bridge rectifier three parts, as shown in Figure 7.The Main Function of the two-way transformer of isolated form DC/DC is that the HVDC Modulation of input stage is become to intermediate frequency square-wave signal, and through intermediate frequency transformer transformation and be coupled to secondary Fang Houzai and convert direct current to, this voltage transformation process is reversible.Intermediate frequency transformer can be isolated current potential, plays voltage of transformation and power adjustment.
Above-mentioned two kinds of access waies all access the large capacitor C 1 of direct current power system at DC bus access point place, for the DC compensation voltage of stable output.
The course of work of the present invention is specially:
Voltage and current signal collecting unit gathers the voltage and current signal of DC bus;
In the time occurring on DC bus that direct voltage falls or rises, controller produces corresponding voltage compensation instruction and transmits DC/DC reversible transducer and DC energy storage unit; If direct voltage falls, energy-storage units is to DC/DC reversible transducer DC power output, DC/DC reversible transducer carries out the corresponding of switching device and cut-offs under voltage compensation instruction effect, exports to electric power system so that the direct current energy of DC energy storage unit output is adjusted into suitable bucking voltage; If DC voltage rising, DC/DC reversible transducer carries out the corresponding of switching device and cut-offs under voltage compensation instruction effect, and to send direct current energy unnecessary electric power system to energy-storage units, energy-storage units is stored this unnecessary direct current energy;
When occurring on DC bus that harmonic voltage, controller produce corresponding harmonic compensation instruction and transmit DC/DC reversible transducer and DC energy storage unit; If harmonic compensation instruction is for just, energy-storage units is to DC/DC reversible transducer DC power output, DC/DC reversible transducer carries out the corresponding of switching device and cut-offs under the effect of harmonic voltage compensating instruction, exports to electric power system so that the direct current energy of DC energy storage unit output is adjusted into suitable bucking voltage; If harmonic compensation instruction is for negative, DC/DC reversible transducer carries out the corresponding of switching device and cut-offs under voltage compensation instruction effect, and direct current energy unnecessary electric power system is sent to energy-storage units, energy-storage units is stored this direct current energy;
In the time that direct current occurs exceeding limit value, controller produces corresponding Current Control instruction and transmits DC/DC reversible transducer and DC energy storage unit, energy-storage units reduces to the direct current energy of DC/DC reversible transducer output, DC/DC reversible transducer carries out the corresponding of switching device and cut-offs under Current Control instruction effect, controls the size of direct current; Or DC/DC reversible transducer carries out the corresponding of switching device and cut-offs under Current Control instruction effect, to send direct current energy unnecessary electric power system to energy-storage units, the direct current energy that energy-storage units storage DC/DC reversible transducer sends, thereby the size of control direct current;
When DC bus-bar voltage and electric current show that short trouble appears in direct current power system, controller produces loop and cuts off instruction and also send DC/DC reversible transducer to, and DC/DC reversible transducer control switch device turn-offs with insantaneous break loop;
Further, in the time that DC bus-bar voltage belongs to normal range (NR), make whole adjuster enter bypass operational mode port a and b short circuit, to reduce electric energy loss and self impact on direct current system normal condition of tandem type direct current system adjuster.
The above is preferred embodiment of the present invention, but the present invention should not be confined to the disclosed content of this embodiment and accompanying drawing.Do not depart from the equivalence or the amendment that under spirit disclosed in this invention, complete so every, all fall into the scope of protection of the invention.
Claims (2)
1. a tandem type direct current system electric energy regulator, comprises
Voltage and current signal collecting unit, it connects controller, for gathering busbar voltage and the current signal of direct current power system, to sending controller to after this Signal Pretreatment;
Controller, it connects respectively voltage and current signal collecting unit, DC/DC reversible transducer and DC energy storage unit, for busbar voltage and the current signal of receiver voltage current signal collecting unit, this signal is analyzed, produced corresponding control command and send DC/DC reversible transducer and DC energy storage unit to;
DC energy storage unit, it connects respectively controller and DC/DC reversible transducer, for receiving the control command of controller, under this instruction control, receive the direct current energy that electric power system exports by DC/DC reversible transducer or provide direct current energy by DC/DC reversible transducer to electric power system;
DC/DC reversible transducer, it connects respectively controller, DC energy storage unit and filter unit, for receiving the control command of controller, the direct current energy of DC energy storage unit output is adjusted into suitable bucking voltage exports to electric power system thereby control cut-offfing of its own switch device under this instruction effect, or send direct current energy unnecessary electric power system to DC energy storage unit;
Filter unit, it connects DC/DC reversible transducer, carries out filtering processing for the direct voltage that DC energy storage unit is exported by DC/DC reversible transducer;
Described control command comprises that Current Control instruction, voltage compensation instruction, harmonic compensation instruction and loop cut off instruction, are specially:
In the time occurring on DC bus that direct voltage falls or rises, for maintenance DC bus-bar voltage is constant or maintain set-point, controller produces corresponding voltage compensation instruction and sends DC/DC reversible transducer and energy-storage units to;
When occurring harmonic voltage on DC bus, for offsetting the harmonic propagation of harmonic voltage, smooth dc voltage waveform and insulating power supply side and load side, controller produces harmonic compensation instruction and sends DC/DC reversible transducer and energy-storage units to;
In the time that direct current occurs exceeding limit value, for controlling the size of direct current, controller produces corresponding Current Control instruction and transmits DC/DC reversible transducer and DC energy storage unit;
When DC bus-bar voltage and electric current show that short trouble appears in direct current power system, controller produces loop and cuts off instruction and send DC/DC reversible transducer to, with the shutoff of switching device of the very first time Instantaneous Control DC/DC reversible transducer that occurs at short trouble, insantaneous break loop, the large electric current of fault when the short circuit of restriction direct current power system, be conducive to excise fast fault, prevent the further expansion of short trouble.
2. tandem type direct current system electric energy regulator according to claim 1, it is characterized in that, described adjuster also comprises the two-way transformer of isolated form DC/DC, the secondary of the two-way transformer of isolated form DC/DC connects filter unit, and the former limit of the two-way transformer of isolated form DC/DC connects DC bus.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104269841B (en) * | 2014-09-19 | 2016-08-17 | 中国舰船研究设计中心 | A kind of direct current network rectification harmonic suppression apparatus |
| CN105826914A (en) * | 2016-03-18 | 2016-08-03 | 广东工业大学 | Parallel-type DC power system power quality conditioner |
| CN107147104A (en) * | 2017-07-25 | 2017-09-08 | 上海交通大学 | The voltage pulsation recovery device and restoration methods of a kind of direct-flow distribution system |
| WO2021128713A1 (en) * | 2019-12-26 | 2021-07-01 | 上海派能能源科技股份有限公司 | Power source apparatus |
| CN112542950B (en) * | 2020-11-27 | 2022-03-15 | 株洲中车时代电气股份有限公司 | Bidirectional DC/DC converter, urban rail vehicle and traction system thereof |
| CN113489025B (en) * | 2021-07-15 | 2023-03-07 | 西安热工研究院有限公司 | Control method for assisting AGC frequency modulation super-capacitor device of thermal power generating unit |
| 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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