CN204012712U - Power quality controlling and energy storage integrated energy saver - Google Patents
Power quality controlling and energy storage integrated energy saver Download PDFInfo
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- CN204012712U CN204012712U CN201420376744.9U CN201420376744U CN204012712U CN 204012712 U CN204012712 U CN 204012712U CN 201420376744 U CN201420376744 U CN 201420376744U CN 204012712 U CN204012712 U CN 204012712U
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Abstract
The utility model discloses a kind of power quality controlling and energy storage integrated energy saver, comprise: the compensation branch road between at least one access polyphase circuit and load, every described compensation branch road is connected with a phase line of described polyphase circuit, and every compensation branch road comprises at least one H bridge unit, each described H bridge unit comprises the H bridge circuit of controlling by outer shroud, the first electric capacity and the second electric capacity, and the AC of multiple described H bridge circuits series connection, the DC side of each described H bridge circuit and described the first Capacitance parallel connection, the second electric capacity is connected with the first electric capacity by DC conversion device, described DC conversion device comprises contact resistance in parallel and switching device.The utility model is realized the function of energy storage and power quality controlling in same device, can carry out harmonic wave, idle improvement, simultaneously can absorb on the spot feedback electric energy, and selects discharge suitable opportunity, stablizes line voltage, has improved the utilance of electric energy.
Description
Technical field
The utility model relates to power equipment correlative technology field, particularly a kind of power quality controlling and energy storage integrated energy saver.
Background technology
In recent years, under the promotion of national energy-saving consumption reduction policy, the electric energy-saving of large industrial enterprise has become the focus of research.For improving the utilance of electric energy, a lot of transmission devices are transformed into AC drives by original DC Transmission, and after the large-scale popularization of more alternating current variable frequency transmission device, the high order harmonic component of power distribution network inside is increased, occurred the situations such as some resonance, the overheated scaling loss of transformer, equipment cannot put into operation.In addition, because AC drives possesses the energy feedback function under motor braking operating mode, at present, the electric energy of these feedbacks is sent to electrical network, and this long-range feedback mainly consumes on the line the electric energy of feedback, and recycling rate is not high.This situation is especially obvious in mine power supply, because Remote feeding distance in down-hole is tens of kilometers, the reasons such as the popularization and application of the convertor equipments such as use and frequent starting, frequency converter of concentrating long distance power supply, large capacity induction machine cause that face voltage fluctuation is large, power factor is low, line loss is large, device start difficulty, impact is produced.
(1) necessity of power quality controlling
On the one hand, power load increasingly complex and variation, particularly for operational effect energy-conservation and raising electric power system, power supply department encourage user change use sooner, more efficient production equipment, such as various frequency control equipment in industrial system is replacing traditional motor direct drive mode, idle, the harmonic wave that brings due to the use of various current transformers, flickering and the stable state electromagnetic disturbance problem such as uneven have become the focus that user pays close attention to.On the other hand, along with a large amount of uses of precise electronic and the electric equipment of computer, microprocessor control, these equipment rely on more and more higher to the reliability of power supply.Therefore, particularly important at society to the improvement of the quality of power supply, wherein harmonic wave, idle improvement are the matters of utmost importance in power quality problem.
(2) necessity of energy storage
Energy storage is electricity commodity, and along with the outlet of distributed power generation, power distribution network has been no longer independent power load, is also some small generators of distributed existence.Energy storage device is exactly fully to have energy storage electric energy in generating situation in distribution, then in distribution electricity consumption situation, discharges electric energy, realizes the consumption on the spot of distribution energy output, reduces the power taking to electrical network, thereby realizes the peak use rate of distribution energy output.In distribution, being not only the Blast Furnace Top Gas Recovery Turbine Unit (TRT) such as photovoltaic can generate electricity, AC drives also can generate electricity under damped condition at present, especially the potential energy of lift in the time declining is converted into this class device of electric energy, energy output is larger, and its required electric energy in the time rising is larger, can reduce it at rising operating mode time institute power taking energy by energy storage device.
(3) reactive power harm and existing improvement technology
Power consumption equipment is mostly inductive load, except getting to power supply useful active power, also exists a large amount of reactive powers to exchange between power supply and load, causes power factor to reduce, and causes harmful effect.
1. cause that line current increases, the capacity of power supplying and distributing equipment can not be made full use of, reduced the power supply capacity of system;
2. current effective value increases, and the power loss of equipment and circuit and electric energy loss are sharply increased;
3. the loss of voltage of circuit and transformer strengthens, and changes aggravation, and the quality of voltage of load end is declined;
4. for generator, reactive current increases, and the demagnetizing effect of motor is increased, and terminal voltage reduces, and makes the reduction of exerting oneself of generator.
Filter (LC) ﹑ thuristor throw-in and throw-off reactor (the Thyristor Switched Capcitor that the device of reactive power compensation is made up of reactance and electric capacity, TSC) ﹑ thyristor-controlled reactor (Thyristor Controlled Reactor, TCR) ﹑ magnet controlled reactor (MagnetismControlled Reactor, MCR) ﹑ static reacance generator (Static Var Generator, SVG) etc., wherein SVG is that current reactive power is administered the state-of-the-art mode in field, it adopts the auxiliary reactive power compensator forming with low capacity energy-storage travelling wave tube of full-controlled switch device composition self commutated inverter, it is one of the core apparatus of flexible AC transmitting system and core technology, Main Function in electric power system is to carry out reactive power compensation, maintain voltage stable of tie point, the steady-state behaviour of improvement system and dynamic property.Have compared with existing static passive compensation device SVC that governing speed is fast, range of operation is wide, absorb idle continuously, the advantage such as harmonic current is little, loss is low, reactor used and condenser capacity and installation volume greatly reduce.In SVG device, in order to reduce harmonic wave, raising capacity, often adopt the multiple technology of two-level inverter.But need the zigzag transformer of heaviness, costliness, power consumption, this volume and cost, energy loss that has greatly increased system also increases thereupon.The high-power SVG connecting for the problems referred to above transless has adopted many level of Cascade H bridge structure in a large number, also claims cascade or chain structure.It by the synthetic staircase waveform of several level square waves to approach sine output voltage, this converter due to increase, the output waveform of output-voltage levels number have the voltage stress that good harmonic spectrum and each switching device bear less, without equalizer circuit, the variety of issue that can avoid large dv/dt to cause.
(4) Harmfulness Caused by Harmonics and existing improvement technology
Industrial expansion makes increasing power electronic equipment and nonlinear-load thereof in electrical network, obtain application, and this also makes harmonic pollution problem more highlight.Harmonic wave out can cause outside electric network pollution and the normal operation of harm electric power system, also can bring a large amount of harmonic waves to damage, and wastes energy, and endangers various energy-saving devices.
1. harmonic wave can cause the supplementary load loss of electrical network.In general, it is little that harmonic current and fundamental current are compared proportion, but harmonic frequency is high, and it is a lot of that the kelvin effect of wire increases harmonic wave resistance, and the loss therefore being produced by harmonic wave is also large.
2. harmonic wave can cause the supplementary load loss of electric rotating machine and transformer.Harmonic wave is mainly to cause that supplementary load loss are overheated on the impact of electric rotating machine and transformer, is secondly generation mechanical oscillation, causes and harmonic wave overvoltage, and these all can shorten motor or transformer life, also can damage motor or transformer when serious.
3. harmonic wave is large to the harm of power equipment.Harmonic wave existence meeting causes damage to power equipment, accelerates ageing of insulation; Voltage peak after harmonic wave stack can reduce its insulation property; Serious harmonic wave overcurrent increases the loss of equipment, heating aggravation.
4. the equipment such as harmonic wave interference communications and relaying protection.Harmonic wave disturbs weakness equipment such as computer, communication, relaying protection, ammeters, the normal work of impact and life.
The device that harmonic wave suppresses has two kinds of LC ﹑ Active Power Filter-APFs (Active Power Filter, APF), and LC is passive mode, and easy and system produces resonance, can only compensate fixed frequency harmonic wave.And its principle of APF and SVG are similar, be also to adopt full-controlled switch device composition self commutated inverter to assist with low capacity energy-storage travelling wave tube to form, can follow the tracks of fast compensation each harmonic, and consistent system resonance, be the state-of-the-art mode in current harmonic wave control field.At present main what use is transformer multiplex mode, or the direct parallel connection of multiple APF or distributed compensation are to realize the compensation of larger capacity.Because being is operated in low-pressure side, be subject to the impact of transformer, the promptness of high-pressure side harmonic source compensation is affected, limited to the compensation effect of high-pressure side harmonic wave.APF possesses the function that reactive power and harmonic wave compensate simultaneously, but because APF carries out harmonic compensation, the switching frequency of required device is high, is subject to the restriction of device capacity, substantially without the ability of reactive power output, is more difficult to meet the demand of large capacity reactive compensation.
(5) energy storage technology
Energy-storage system can be realized four-quadrant by voltage source converter (voltage source converter, VSC) and move flexibly.As microgrid critical function unit, energy storage has very important effect for improvement, " peak load shifting " and the uninterrupted power supply of the qualities of power supply such as microgrid power fluctuation.Energy-storage system capacity under steady operation condition has certain surplus, even in idle state.So can implement multi objective control to energy-storage system, realize the function such as active power filtering and reactive power compensation and improve micro-electrical network quality of power supply.If multi-functional combining inverter can two-way operation and realized integratedly in conjunction with energy storage device, can realize energy-storage system multi objective control.Can not only generate electricity by way of merging two or more grid systems, also can complete the functions such as quality of power supply adjusting simultaneously, reduce investment and the volume of system, be particularly useful for micro-electrical network.
Energy storage mode has much at present, is divided into chemical energy energy storage and physics energy storage, such as super capacitor, the lithium battery etc. of chemical energy; And physics energy storage comprises flywheel, air compressing etc.
Being published in " electric power network technique " document of the 36th 11 phases of volume " based on micro-voltage ripple of power network inhibition method of energy storage device and static reacance generator coordination control strategy " proposes to utilize SVG comprehensively to solve in power distribution network the power quality problems such as idle deficiency, voltage fluctuation and flickering, current distortion, three-phase imbalance; Access energy storage device in parallel coordinates and suppresses voltage fluctuation problem simultaneously.
But, document " based on micro-voltage ripple of power network inhibition method of energy storage device and static reacance generator coordination control strategy " inner introduce be by energy storage device and the parallel running of SVG device, realize the inhibition to voltage fluctuation by Collaborative Control.Emphasis is the coordination of telling about both, and is not that integrated two kinds of functions are in one.This scheme belongs to two independently devices, realizes simultaneously, but be not integrated technique although can realize said power quality controlling and energy storage in this patent.Therefore, this mode energy storage device needs inverter VSC, and same SVG also needs inverter VSC, because these two kinds of devices are independent separately, does not share any equipment, so cost is larger, the utilance of device is low.
Utility model content
Based on this, be necessary to fail to realize energy storage and the integrated technical problem of power quality controlling for prior art, a kind of power quality controlling and energy storage integrated energy saver are provided.
A kind of power quality controlling and energy storage integrated energy saver, comprise: the compensation branch road between at least one access polyphase circuit and load, every described compensation branch road is connected with a phase line of described polyphase circuit, and every compensation branch road comprises at least one H bridge unit, each described H bridge unit comprises the H bridge circuit of controlling by control device, the first electric capacity and the second electric capacity, and the AC of multiple described H bridge circuits series connection, the DC side of each described H bridge circuit and described the first Capacitance parallel connection, the second electric capacity is connected with the first electric capacity by DC conversion device, described DC conversion device comprises contact resistance in parallel and switching device.
Further, described DC conversion device also comprises circuit equivalent reactance and is connected reactance, described contact resistance is connected with described circuit equivalent reactance and is formed the first branch road, described connection reactance forms the second branch road after connecting with described switching device, described the first branch road and described the second branch circuit parallel connection, and described the first branch road is connected with one end of described the first electric capacity with the first tie point of described the second branch circuit parallel connection, described the first branch road is connected with one end of described the second electric capacity with the second tie point of described the second branch circuit parallel connection, the other end of described the first electric capacity is connected with the other end of described the second electric capacity.
Further, described switching device is short circuit circuit breaker.
Further, described the first electric capacity is DC capacitor, and described the second electric capacity is super capacitor.
Further, also comprise at least one filter branch, each described filter branch and a described compensation branch circuit parallel connection.
Further, described filter branch is high-pass filtering branch road.
Further, described filter branch comprises: filter reactance, filter resistance and filter capacitor, described filter reactance is connected with described filter capacitor with after described filter resistance parallel connection.
The utility model, by by the DC side of H bridge circuit and the first electric capacity and the second Capacitance parallel connection, therefore can be realized and the exchange of extraneous electric energy by suitable control DC voltage; Utilize the AC of Cascade H bridge circuit to realize the compensation of reactive power and low-order harmonic simultaneously.The utility model is realized the function of energy storage and power quality controlling in same device, can carry out harmonic wave, idle improvement, simultaneously can absorb on the spot feedback electric energy, and selects discharge suitable opportunity, stablizes line voltage, has improved the utilance of electric energy.
Brief description of the drawings
Fig. 1 is electrical block diagram of the present utility model;
Fig. 2 is the circuit diagram of H bridge unit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.
Be illustrated in figure 1 electrical block diagram of the present utility model.
A kind of power quality controlling and energy storage integrated energy saver, comprise: the compensation branch road 1 between at least one access polyphase circuit and load 4, every described compensation branch road 1 is connected with a phase line 3 of polyphase circuit, and every compensation branch road 1 comprises at least one H bridge unit 11, each described H bridge unit 11 comprises the H bridge circuit 111 of controlling by control device, the first electric capacity and the second electric capacity, and the AC of multiple described H bridge circuits 111 series connection, the DC side of each described H bridge circuit 111 and described the first Capacitance parallel connection, the second electric capacity is connected with the first electric capacity by DC conversion device, described DC conversion device comprises contact resistance in parallel and switching device.
Wherein, the control device of H bridge circuit 111, can be the outer shroud in existing dicyclo control.
As shown in Figure 1, wherein polyphase circuit is the system of the star-like connection of three-phase full symmetric, have three compensation branch roads 1, each compensation branch road 1 comprises N H bridge unit 11, each described H bridge unit 11 comprises H bridge circuit 111, the first electric capacity and the second electric capacity, the AC series connection of N H bridge circuit 111.
The DC side of H bridge circuit 111 and the first electric capacity and the second Capacitance parallel connection, therefore can realize and the exchange of extraneous electric energy by suitable control DC voltage; Utilize the AC of Cascade H bridge circuit 111 to realize the compensation of reactive power and low-order harmonic simultaneously, thereby improve power factor.
The DC side that the first electric capacity and the second electric capacity is incorporated to H bridge circuit 111, has four benefits, and the first can absorb on the spot to the electric energy of AC Drive load 4 feedbacks; It two is that the suitable release of electric energy that the first electric capacity and the second electric capacity are stored can suppress due to the meritorious voltage fluctuation problem causing of load shock; It three is to have had the first electric capacity and the second electric capacity, has reduced the peak value of getting from electrical network meritorious, reduces system configuration capacity; It four is using H bridge unit 11 as uninterrupted power supply (Uninterruptible Power System/Uninterruptible Power Supply, UPS), in the time that major network has a power failure, to power to underload.
Meanwhile, adopt H bridge cascade structure, can directly access high-pressure system, fast response time, floor space is few, equipment loss is low, can meet the compensation requirement of various impacts, mutational load.
As shown in the circuit diagram of the H bridge unit of Fig. 2:
Wherein, H bridge circuit 111 is by 4 insulated gate bipolar transistors (Insulated GateBipolar Transistor, or the bridge circuit of the full control such as integrated gate commutated thyristor (IntegratedGate-Commutated Thyristor, IGCT) device composition IGBT).
Therein in an embodiment, described DC conversion device 1123 also comprises: circuit equivalent reactance L1 be connected reactance L2, described contact resistance R connects with described circuit equivalent reactance L1 and forms the first branch road, after connecting with described switching device, described connection reactance L2 forms the second branch road, described the first branch road and described the second branch circuit parallel connection, and described the first branch road is connected with one end of described the first electric capacity 1121 with the first tie point of described the second branch circuit parallel connection, described the first branch road is connected with one end of described the second electric capacity 1122 with the second tie point of described the second branch circuit parallel connection, the other end of described the first electric capacity 1121 is connected with the other end of described the second electric capacity 1122.
Preferably, switching device is short circuit circuit breaker K.
Wherein, the first electric capacity 1121 in Fig. 2 comprise Ca1, Ca2 in Fig. 1, Ca3 ..., CaN, Cb1 ... Cc1, the second electric capacity 1222 in Fig. 2 comprise C2a in Fig. 1 ... C2b ..., C2c.
Between the second electric capacity 1122 and H bridge circuit 111 with contact resistance R, circuit equivalent reactance L1, be connected reactance L2 and short circuit circuit breaker K and coordinate and control, the DC-DC converter of having saved traditional DC side and DC side energy exchange, provides cost savings and controls difficulty.
In an embodiment, described the first electric capacity 1121 is DC capacitor Cdc therein, and described the second electric capacity 1122 is super capacitor Ccdc.
Its operation principle is:
(1) charging operating mode: when toward super capacitor Ccdc charging, the short circuit circuit breaker K on H bridge unit 11 closes, and controls the voltage that improves DC capacitor Cdc, gives DC capacitor Ccdc charging;
(2) electric discharge operating mode: in the time that super capacitor Ccdc externally discharges, the short circuit circuit breaker K on H bridge unit 11 closes, and controls the voltage that reduces DC capacitor Cdc, and DC capacitor Ccdc electric energy is discharged;
(3) operating mode of not discharging of not charging: the short circuit circuit breaker K on H bridge unit 11 disconnects, voltage control on DC capacitor Cdc is moved according to normal design value, now, super capacitor Ccdc will slowly give DC capacitor Cdc charging by contact resistance R, but because the resistance of contact resistance R is very large, for example 20K ohm, electric energy rate of release is very slow.
(4) effect of resistance reactance: R, L1 are for being limited in the metering function under " do not charge and do not discharge " operating mode, reduce under this operating mode, energy exchange between DC capacitor Cdc and super capacitor Ccdc, the effect of L1 is the circulation producing together with the DC capacitor Cdc of inhibition different potentials is shorted to super capacitor Ccdc.
Wherein, ultracapacitor (Supercapacitors, ultracapacitor), have another name called electrochemical capacitor (Electrochemical Capacitors), double electric layer capacitor (ElectricalDoule-Layer Capacitor), gold electric capacity, farad capacitor.It is different from traditional chemical power source, be a kind of between traditional capacitor and battery, there is the power supply of property, mainly rely on electric double layer and redox pseudocapacity charge storage electric energy.But there is not chemical reaction in the process in its energy storage, this thermal energy storage process is reversible, just because of can repeated charge hundreds thousand of times of this ultracapacitor yet.The double electric layer capacitor of its general principle and other kind is the same, is all to utilize the double electrical layers of active carbon porous electrode and electrolyte ingredient to obtain the capacity of super large.
In an embodiment, as shown in Figure 1, also comprise at least one filter branch 2 therein, each described filter branch 2 is in parallel with a described compensation branch road 1.
Be incorporated to filter branch 2, can further carry out filtering to harmonic wave, filter branch 2 can also provide part capacitive reactive power simultaneously, can reduce the capacity of H bridge unit 11.
In an embodiment, described filter branch 2 is high-pass filtering branch road therein.
Can administer high order harmonic component by suitable configurations filter branch 2, to meet the harmonic filtration of wide frequency domain of application of frequency converter occasion.
In an embodiment, described filter branch 2 comprises therein: filter reactance 21, filter resistance 22 and filter capacitor 23, after described filter reactance 21 is in parallel with described filter resistance 22, connect with described filter capacitor 23.
As an example, in Fig. 1, there are three filter branch 2, filter reactance 21 comprises La, Lb, Lc, and filter resistance 22 comprises Ra, Rb, Rc, and filter capacitor 23 comprises Ca, Cb, Cc.Wherein, Ra, La and Ca form an A phase filter branch, determine resonance frequency M by the coupling of parameters is set, and being engaged in formation is an impedance path to M frequency and above harmonic wave; In like manner, Rb, Lb and Cb form a B phase filter branch, and Rc, Lc and Cc form a C phase filter branch.
As an example, the first electric capacity is DC capacitor Cdc, and the second electric capacity is super capacitor Ccdc, and the charge control method of DC voltage is as follows:
1. the power relation in detection of grid, detects the power that in Fig. 1, A is ordered, and in the time that active power is less than zero, electric energy feedback electrical network has been described, number of times k=0 is carried out in initialization.
2. the short circuit circuit breaker K controlling on all H bridges unit 11 closes a floodgate;
3. increase the reference voltage of DC side according to a fixed step size △ U, see following formula (1), in formula, Uref_normal is that H bridge unit 11 is operated in the direct current target voltage that does not charge and do not discharge under operating mode, Udc_all_Ref is the total direct voltage reference value of charging, and N is every number that compensates mutually H bridge unit 11 in branch road 1.
Udc_all_Ref＝3×N×(Uref_normal+ΔU) (1)
4. by the dicyclo proportional integral dicyclo proportional integral (PI) of DC side is controlled, instruction current Idc_all_Ref when the charging of the each described H bridge circuit of change control, in formula, Kp, Ki are respectively ratio, integral coefficient, current total direct voltage and as the k time charging total direct voltage Udc_all_Fb
k, Udc_all_Fb
ibe the i time the total direct voltage of charging and.
5. each H bridge unit 11 control to DC voltage, instruction current during according to charging, each H bridge unit 11 distributes total active power, adjusts the direct voltage equilibrium of each H bridge unit 11 DC side.
6. detect the active-power P s that A is ordered, if active-power P s is less than zero, after execution number of times k being added to one, perform step 3., otherwise execution step 7.;
7. disconnect the short circuit circuit breaker K of all H bridges unit 11, and again regulate direct voltage to not charging the operating mode of not discharging, that is:
Udc_all_Ref＝3×N×(Uref_normal) (3)
Charging finishes, and charging result is that the voltage on the voltage ratio DC capacitor Cdc on super capacitor Ccdc wants high.
Wherein, polyphase circuit outlet common point is the A point in Fig. 1 in above-mentioned example.Polyphase circuit outlet common point also can be called the outlet common point of the transformer of polyphase circuit (for example star-like three-phase circuit).
Wherein, the dicyclo proportional plus integral control of H bridge circuit is controlled by the control outer shroud being connected with H bridge circuit.
As an example, the first electric capacity is DC capacitor Cdc, and the second electric capacity is super capacitor Ccdc, and control of discharge step point the following steps of DC voltage are carried out:
1. the active-power P s that described polyphase circuit outlet common point detected is greater than at 1 o'clock, and the terminal voltage Us of described polyphase circuit outlet common point is while being less than default discharge voltage reference threshold, and number of times p=0 is carried out in initialization;
2. the short circuit circuit breaker K of each H bridge unit 11 closes;
3. according to detecting load current IL, it is the electric current that in Fig. 1, B is ordered, the voltage of ordering in conjunction with A comprehensively judges, the active power value of getting according to load and now voltage fall situation, calculates the total active power that needs all described H bridges unit to discharge and treats delivered power amount Px as electric discharge;
4. according to the capacitance of super capacitor Ccdc and its voltage, treat delivered power amount Px according to electric discharge, obtain the reference voltage sum of DC side of all described H bridge circuits as the total direct voltage reference value Ux_Ref of electric discharge;
The current voltage value sum of the DC side of all described H bridge circuits is as the total direct voltage of electric discharge and the Udc_all_Fb of current the p time
p';
5. instruction current Idc_all_Ref' when the PI of DC side being controlled to the meritorious electric discharge of the control of amendment H bridge unit 11, thus realize electric discharge;
；
Wherein, Kp' is electric discharge scale parameter, and Ki' is electric discharge integral parameter, Udc_all_Fb
j' be the j time the total direct voltage of electric discharge and;
6. the control of each H bridge unit 11 DC voltages, each H bridge unit 11 during according to described electric discharge instruction current Idc_all_Ref total active power is distributed, adjust the direct voltage equilibrium of each H bridge unit 11 DC side;
7. detect active-power P s and terminal voltage Us that A is ordered, if active-power P s is greater than at 1 o'clock, and terminal voltage Us is less than default discharge voltage reference threshold, after executions number of times p being added to one, execution step 3., otherwise, perform step 8.
8. disconnect the short circuit circuit breaker K of all H bridges unit 11, and again regulate direct voltage to not charging the operating mode of not discharging, that is: Udc_all_Ref=3 × N × (Uref_normal);
Electric discharge finishes.
Wherein, polyphase circuit outlet common point is the A point in Fig. 1 in above-mentioned example, and the load input terminal of polyphase system is the B point in Fig. 1 in above-mentioned example.
As an example, the first electric capacity is DC capacitor Cdc, and the second electric capacity is super capacitor Ccdc, and the UPS of DC voltage controls step point the following steps and carries out:
1. the terminal voltage Us that described polyphase circuit outlet common point detected is less than uninterrupted power supply Voltage Reference threshold value, and number of times m=0 is carried out in initialization;
2. the short circuit circuit breaker K of each H bridge unit 11 closes;
3. according to detecting load current IL, the electric current that in Fig. 1, B is ordered, the voltage of ordering in conjunction with A comprehensively judges, the active power value of getting according to load, the active power value that the load of described polyphase system is got, as uninterrupted power supply active-power P L to be discharged;
4. according to the capacitance of super capacitor Ccdc and its voltage, according to uninterrupted power supply active-power P L to be discharged, obtain the reference voltage sum of DC side of all described H bridge circuits as the total direct voltage reference value of uninterrupted power supply Ux_Ref;
The current voltage value sum of the DC side of all described H bridge circuits 11 is as the total direct voltage of uninterrupted power supply and the Udc_all_Fb of current the m time
p";
5. the DC side of all described H bridge circuits 11 is carried out to dicyclo proportional plus integral control, revises the uninterrupted power supply instruction current Idc_all_Ref of all described H bridge circuits 11 " be:
；
Wherein, Kp " being uninterrupted power supply scale parameter, Ki " is uninterrupted power supply integral parameter, Udc_all_Fbm " be the m time the total direct voltage of uninterrupted power supply and
6. the control of each H bridge unit 11 DC voltages, each H bridge unit 11 distributes total active power according to uninterrupted power supply instruction current, adjusts the direct voltage equilibrium of each H bridge unit 11 DC side;
7. detect the terminal voltage Us that A is ordered, if terminal voltage Us is less than uninterrupted power supply Voltage Reference threshold value, after described execution number of times p being added to one, perform step 3., otherwise execution step 8.
8. disconnect the short circuit circuit breaker K of all H bridges unit 11, and again regulate direct voltage to not charging the operating mode of not discharging, that is: Udc_all_Re=3 × N × (Uref_normal);
Electric discharge finishes.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (7)
1. a power quality controlling and energy storage integrated energy saver, it is characterized in that, comprise: the compensation branch road between at least one access polyphase circuit and load, every described compensation branch road is connected with a phase line of described polyphase circuit, and every compensation branch road comprises at least one H bridge unit, each described H bridge unit comprises the H bridge circuit of controlling by outer shroud, the first electric capacity and the second electric capacity, and the AC of multiple described H bridge circuits series connection, the DC side of each described H bridge circuit and described the first Capacitance parallel connection, the second electric capacity is connected with the first electric capacity by DC conversion device, described DC conversion device comprises contact resistance in parallel and switching device.
2. power quality controlling according to claim 1 and energy storage integrated energy saver, it is characterized in that, described DC conversion device also comprises circuit equivalent reactance and is connected reactance, described contact resistance is connected with described circuit equivalent reactance and is formed the first branch road, described connection reactance forms the second branch road after connecting with described switching device, described the first branch road and described the second branch circuit parallel connection, and described the first branch road is connected with one end of described the first electric capacity with the first tie point of described the second branch circuit parallel connection, described the first branch road is connected with one end of described the second electric capacity with the second tie point of described the second branch circuit parallel connection, the other end of described the first electric capacity is connected with the other end of described the second electric capacity.
3. power quality controlling according to claim 2 and energy storage integrated energy saver, is characterized in that, described switching device is short circuit circuit breaker.
4. according to the power quality controlling described in claim 1～3 any one and energy storage integrated energy saver, it is characterized in that, described the first electric capacity is DC capacitor, and described the second electric capacity is super capacitor.
5. power quality controlling according to claim 1 and energy storage integrated energy saver, is characterized in that, also comprises at least one filter branch, each described filter branch and a described compensation branch circuit parallel connection.
6. power quality controlling according to claim 5 and energy storage integrated energy saver, is characterized in that, described filter branch is high-pass filtering branch road.
7. power quality controlling according to claim 5 and energy storage integrated energy saver, it is characterized in that, described filter branch comprises: filter reactance, filter resistance and filter capacitor, described filter reactance is connected with described filter capacitor with after described filter resistance parallel connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420376744.9U CN204012712U (en) | 2014-07-09 | 2014-07-09 | Power quality controlling and energy storage integrated energy saver |
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| CN201420376744.9U CN204012712U (en) | 2014-07-09 | 2014-07-09 | Power quality controlling and energy storage integrated energy saver |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104167738A (en) * | 2014-07-09 | 2014-11-26 | 中国神华能源股份有限公司 | Electric energy quality treatment and energy storage integrated energy saving device and control method |
| CN107223304A (en) * | 2015-02-04 | 2017-09-29 | Abb瑞士股份有限公司 | Multi-level converter with energy accumulator |
| CN108073264A (en) * | 2016-11-18 | 2018-05-25 | 广达电脑股份有限公司 | Electronic device and method for dynamically controlling current |
-
2014
- 2014-07-09 CN CN201420376744.9U patent/CN204012712U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104167738A (en) * | 2014-07-09 | 2014-11-26 | 中国神华能源股份有限公司 | Electric energy quality treatment and energy storage integrated energy saving device and control method |
| CN107223304A (en) * | 2015-02-04 | 2017-09-29 | Abb瑞士股份有限公司 | Multi-level converter with energy accumulator |
| CN107223304B (en) * | 2015-02-04 | 2019-12-17 | Abb瑞士股份有限公司 | Multilevel converter with energy storage |
| CN108073264A (en) * | 2016-11-18 | 2018-05-25 | 广达电脑股份有限公司 | Electronic device and method for dynamically controlling current |
| CN108073264B (en) * | 2016-11-18 | 2020-06-05 | 广达电脑股份有限公司 | Electronic device and method for dynamically controlling current |
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