CN102780226A - Direct-current-side voltage control method of cascaded STATCOM (static var compensator) based on chopping-control voltage sharing and control circuit - Google Patents
Direct-current-side voltage control method of cascaded STATCOM (static var compensator) based on chopping-control voltage sharing and control circuit Download PDFInfo
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Abstract
The invention relates to a direct-current-side voltage control method of a cascaded STATCOM based on chopping-control voltage sharing, and a control circuit. The control circuit comprises a three-phase star-connection inverter, a two-way switch device and a controller, and is characterized in that the three-phase star-connection inverter is connected with a three-phase power grid through three inlet inductors; each phase of the inverter consists of n pieces of 2H bridge inverter circuit modules serially connected with each other and having an independent direct-current-side capacitor; the direct-current-side capacitors of the n pieces of inverter circuit modules are connected in parallel; and a two-way chopping-control switch is respectively connected with both ends of the i<th> direct-current-side capacitor and with both ends of the (i-1)<th> direct-current-side capacitor in parallel connection with the i<th> direct-current-side capacitor, wherein i is a natural number from 2 to n. The direct-current-side voltage control method provided by the invention can effectively and reliably solve the key problem limiting the use of the STATCOM with the structure in a high-voltage large-capacity occasion, and can simplify the control program and the design of a regulator, greatly improve the system reliability, and remarkably lower the voltage-sharing control cost, thereby realizing the reliable application of the cascaded STATCOM in high-voltage large-capacitor power equipment.
Description
Technical field:
The invention belongs to the power quality controlling research field, particularly the DC side voltage control method of mesohigh chain type STATCOM and control circuit.
Background technology:
Chain type STATCOM has significant advantages such as level quantity is many, harmonic content is few, passive device is little, scalability is good; In electrical power trans mission/distribution system, bringing into play compensating reactive power; Improve the stability of system voltage; The important function such as runnability of improvement system; Being the effective means that solves the big capacity of mesohigh field power quality problem, is flexible AC transmitting system (Flexible AC Transmission System, one of core technology FACTS).
The premium properties of chain type STATCOM and existing systems control strategy all are based upon each power model to have on the perfect conforming basis, promptly requires each power model must have identical dc capacitor voltage.But in the real system; Because the otherness of the parasitic parameter of switching device, operating state etc.; The active power that the different capacity module need absorb or send can be different; The dc voltage that therefore the part power model will occur falls comparatively fast, and the reduction of the dc voltage of a part of power model is slower in addition, i.e. the dc voltage energy imbalance.Therefore, must plus outer control ensure that dc voltage is stable and do not fall that and dc voltage remains equal.
The unbalanced reason of dc voltage is concluded and is mainly contained two aspects: the one, and the inconsistency of power model parameter; The 2nd, the inconsistency of power model operating state, these two kinds of reasons have caused the quantity of power model consumed energy and power consumption inconsistent.Existing DC voltage control strategy also can be divided into two big types: the first kind is a hardware approach, and basic thought is the energy that comes the supply dc bus capacitor to consume through hardware circuit.These class methods typically have: paraller resistanc method, ac bus energy exchange method, dc bus energy exchange method etc.; The hardware circuit that these class methods are used mainly contains: the combination of PWM rectification circuit, diode rectifier bridge, inverter and isolating transformer; Difference between the distinct methods is mainly reflected in the path of circuit topology, energy source and energy Flow; Wherein classic methods is to use the phase shift multi winding transformer to add the diode rectifier scheme, and it is the main stream approach of present dc capacitor voltage control.Hardware approach is all pressed, the effect of voltage stabilizing is fine, but cost is high, volume is big, efficient is low and be not easy to expansion.The difficult design of part hardware, produce inconvenience, control is complicated, but also can cause the power factor step-down of device, pollutes electrical network.
Second type is software approach; These class methods have adopted the thought of closed-loop control; Carry out PI according to the deviation of the deviation of the dc voltage of power model or power and regulate, thereby obtain the drive signal of each power model, therefore need to gather the dc capacitor voltage of all power models.These class methods are less to the dependence of hardware, only need sensor voltage, current signal, and cost is lower, volume is little.But the design of pi regulator and debugging are complicated.Along with the increase of power model quantity, the PI control ring increases thereupon, makes the PI parameter designing that usually need rely on commissioning experience to accomplish to accomplish.And the coupling complexity between each control ring also sharply increases with the increase of module number, the system debug difficulty, and reliability is very poor, has limited the expansion of system.Therefore, the application in actual device also seldom.
In addition, the essence of software approach is to have regulated the pulse duration or the phase angle of each power model, has just changed the output pulse signal of CPS-SPWM modulator approach.Change pulse duration or phase angle and make the CMI output voltage waveforms become asymmetric, introduced more harmonic wave; A lot of when the power model number, when inconsistency difference is big more, the harmonic frequency that this method is introduced can be low more, the adjustable range of phase angle is also more little, so the applicable scope of this method is very limited.
The present invention has combined advantages such as hardware approach control effect is excellent, software approach is with low cost, adopts the chain type STATCOM DC voltage control strategy that the control device is used in combination with hierarchical control thought of cutting of low capacity.This scheme only need add some costs very low cut the control device; Cooperate simple control program can realize the stable, balanced of each dc capacitor voltage; Save a large amount of high Precision Detection elements and the huge hardware circuit of volume cost, and need not the voltage close loop control of numerous complicated, fragility, thereby simplified control program and design of Regulator; The reliability and the easy implementation of system have been improved greatly; Reduce the cost of electric voltage equalization control significantly, shortened product development cycle, thereby impelled chain type STATCOM to be applied to mesohigh large-capacity power equipment reliably.
Below provide the pertinent literature of retrieval
[1] Liu Wenhua, Song Qiang, Teng Letian. based on the dc-voltage balance control [J] of the 50MVA STATCOM of chain inverter. Proceedings of the CSEE .2004,24 (4): 145-150.
[2] Wei Wenhui. chain type is ended the main circuit of synchronous compensator and the research of Dynamic Control Strategy [D]. Tsing-Hua University's doctorate paper, 2004.
[3] permitted to win. based on the research [D] of the big capacity DSTATCOM of four-quadrant dual H-bridge current transformer cascade type key technology. Southeast China University's doctorate paper, 2009.
[4] wear jade-like stone, Chen Jingjing, palace power. adopt the cascade connection type DSTATCOM decentralized control strategy [J] of many DSP. high voltage technique .2010,36 (11): 2821-2826.
[5] Qiu Yanhui. the research of multiple-level serially connected electric energy quality controller DC side voltage control method. [D] Xi'an Communications University master thesis, 2010.
[6] Liu Zhao, Liu Bangyin, Duan Shanxu. the dc capacitor voltage Balance Control [J] of chain static synchronous compensator. Proceedings of the CSEE .2009,29 (30): 7-12.
[7]Chen?Junling,Yin?Zhizhu,Wang?Ping?et?al.Capacitor?voltage?balancing?control?of?cascaded?multilevel?inverter?for?high-power?active?power?filters[C].Proceedings?of?the2008IEEE?DRPT,2008:1683-1687.
[8]Fujii?K,De?Doncker?R?W.A?Novel?DC-link?Voltage?Control?of?PWM-Switched?Cascade?Cell?Multi-Level?Inverter?Applied?to?STATCOM[C].Proceedings?of?the?2005IEEE?IAS,2005.961-967.
[9]Yanhui?Qiu,Yingjie?He,Jinjun?Liu,Fang?Zhuo.A?DC?Voltage?Control?Method?of?Cascaded?H-bridge?Inverter?for?Power?Quality?Conditioner[C].ISIE?2010,Bari.Yingjie?He,Yanhui?Qiu,Jinjun?Liu,Fang?Zhuo.A?Comprenhensive?Study?of?Voltage?Balancing?Problem?of?Cascaded?H-bridge?Inverter?for?Power?Quality?Conditioner[C].Proc.of?IEEE?IPEC2010.
Summary of the invention:
The object of the present invention is to provide and a kind ofly all press the chain type STATCOM dc capacitor voltage control strategy with the compound use of hierarchical control thought based on cutting control.What this scheme only need be added some low capacities cuts the control device; Cooperate simple control program can realize the stable, balanced of each dc capacitor voltage; Thereby save complicated voltage close loop control fully, significantly reduce the hardware cost of Pressure and Control, control each power model dc capacitor voltage of chain type STATCOM reliably; Make it stable, balanced, guarantee system under the high-voltage large-capacity power utilization environment efficiently, work reliably.
Set forth from topology design and control realization two aspects below:
3) topology design:
Three-phase chain structure multi-electrical level inverter joins through three inlet wire inductance and three phase network; Each is made up of inverter n 2H bridge inverter circuit module series connection that has the independent direct current lateral capacitance, and module number n confirms according to the line voltage grade, generally gets n＞e
m/ u
Dc, e wherein
mBe the amplitude of line voltage, u
DcDc capacitor voltage desired value for each power model;
Every 2 * (n-1) individual control devices of cutting that use mutually; It is the bidirectional switch device; Be used for the dc bus capacitor between the control connection power model; Thereby form public dc bus, unbalanced energy is flowed freely and the unbalanced power of reasonable distribution through dc bus, finally make the dc capacitor voltage of each module all reach poised state.
4) control realizes:
A) the threephase load electric current through the current sensor senses target compensation;
B) in control circuit board, according to instantaneous reactive power theory, the load current that detects is carried out coordinate transform, needing to obtain each phase current composition of compensation-idle, harmonic wave, imbalance etc.;
C) obtain the phase information of three phase network voltage through the computing of phase-locked loop joint, and its and instruction value multiplied each other obtain the fundamental active current composition, promptly overall active power control algolithm;
D) with above b) and the electric current composition that c) obtains superimposed as final control command, control three-phase inverter output current; Concrete implementation method is to detect the output current of three-phase chain type multi-electrical level inverter; And it and corresponding each control command are mutually done poor; And through utilizing the phase shift carrier modulating method to produce the CPS-SPWM signal after the PI adjusting, in order to drive the switching tube IGBT of each power model;
E) generate the drive signal of bidirectional switch device through the logic of main switch; Whether the electric capacity to determine each power model is parallel to dc bus; Thereby carry out energy exchange through common DC bus; Unbalanced energy is redistributed, until the capacitance voltage balance between the dc bus capacitor of each power model.
The invention has the beneficial effects as follows:
The present invention cuts the control device through more additional low capacities, is aided with simple control program, just can realize the energy of each dc bus capacitor of chain type STATCOM is redistributed; Make its capacitance voltage keep stable and balanced; Effectively and reliably solved and limited the key issue that this structure STATCOM uses in the high-voltage large-capacity occasion, and saved a large amount of high Precision Detection elements, and the control of complicated, fragile voltage close loop; Thereby control program and design of Regulator have been simplified; Improve the reliability of system greatly, reduced the cost of Pressure and Control significantly, thereby impelled chain type STATCOM to be applied to mesohigh large-capacity power equipment reliably.In addition,, this controlling schemes has been carried out simulating, verifying, confirmed the validity and the reliability of this scheme through building chain type STATCOM simulation model.Though only built the cascaded structure of 5 modules in the emulation, this method can extend to the series connection of operational blocks which partition system in the real system, thus with this system applies in more high-tension power utilization environment, therefore have application of practical project and be worth.
Description of drawings:
The structural representation of Fig. 1 chain type STATCOM.
The systematic control algorithm block diagram of Fig. 2 chain type STATCOM.
The overall active power control algolithm of Fig. 3 block diagram.
Fig. 4 cuts the annexation figure between control device and the power model.
Fig. 5 circulation working mode figure.
Fig. 6 all presses working mode figure.
The generation method of Fig. 7 switching tube drive signal.
Dc voltage waveform when Fig. 8 does not have DC voltage control.
Fig. 9 (a) applies the control of overall active power and the Equivalent DC side voltage waveform of CMI during the balanced control of no-voltage.
Fig. 9 (b) applies the control of overall active power and the dc voltage waveform of each power model during the balanced control of no-voltage.
Figure 10 adopts the dc capacitor voltage waveform when cutting the control method for equalizing voltage.
Figure 11 cuts the waveform of the equalizing current that flows through in the control device.
The compensation effect of the chain type STATCOM that five power model series connection of Figure 12 form.
Embodiment:
Below in conjunction with accompanying drawing the present invention is done detailed description.
The structure of chain type STATCOM is as shown in Figure 1, by electrical network, reactive load, connection inductance and chain type multi-electrical level inverter (Cascaded Multilevel Inverter, formation such as CMI).CMI is composed in series by N power model.The present invention describes with the Y-connection structure, and the control method that triangle connects can be analogized.Every phase CMI be parallel to after through the inductance that is connected in series system points of common connection (Point of Common Coupling, PCC).The power model that constitutes CMI is a complete single-phase inverter, comprises independently power switch pipe, DC side power supply, drive circuit, testing circuit, protection and control circuit etc.Power model shown in Figure 1 is single-phase 2H bridge inverter, is present the most frequently used a kind of power model.
At present, the widely used modulation strategy of chain type STATCOM is carrier phase sinusoidal pulse width modulation technology CPS-SPWM (Carrier Phase-Shifted SPWM).Widely used system control strategy is for feedforward decoupling zero control algolithm, and is as shown in Figure 2.Referenced reactive current i
LqThrough load current sampling and idle detection algorithm are obtained; Active current instruction i
LdThrough detection of power model dc voltage and active current control algolithm are obtained; Detect voltage on line side, device output current, and it is carried out coordinate transform obtain the feed-forward voltage u under the synchronous rotating frame
Sd, u
SqAnd feedback current i
Cd, i
Cq, above-mentioned physical quantity promptly gets the command voltage u of auto levelizer through the decoupling zero control algolithm
Cd, u
Cq, command voltage obtains final modulation signal through the park inverse transformation, compares with the phase shift triangular carrier and has just obtained final drive signal.
Patent disclosed method of the present invention has adopted hierarchical control thought all to press the thinking that combines with cutting control, is divided into two levels generally: ground floor makes CMI Equivalent DC side voltage stabilize to command value through the total active power of software approach control device; The second layer forms common DC bus through cutting the control device, and whether is parallel to dc bus by each power model of operating state decision of main circuit and carries out energy exchange, thereby realizes the electric voltage equalization between the power model.Soft, hardware approach advantage separately that the method has combined, the shortcoming of having avoided both is a kind of reliable, effective practical methods.
1, overall active power control
Actual chain type STATCOM is not to be desirable reacance generator.In the course of the work; Because actions such as the cut-offfing of switching tube, conducting are to need consumption active power; Therefore the dc voltage of power model will little by little reduce; And the speed that reduces depends on the size of the active power that power model consumes, and the decrease that is to say dc voltage has reflected the active power of power model needs.Therefore, the needed total active power positive correlation of summation and system of the dc voltage of each module reduction.Promptly obtain overall active power (fundamental positive sequence active power) control algolithm by negative feedback thought, as shown in Figure 3.U among the figure
RefRepresentation module dc voltage set-point; u
Dc_ai, u
Dc_bi, u
Dc_ciRepresent respectively actual detected to A, B, C three-phase in the dc voltage value of i power model.Utilize the method in time to inject the active power that required active power just can remedy the loss of system works institute to power model.
Because the inconsistency of power model, the dc voltage rate of descent of disparate modules is also inconsistent; In like manner every mutually required active power also maybe be inconsistent.At this moment, the control of active power should comprise two levels: the alternate Balance Control of overall active power control and active power.The emphasis of this patent is the electric voltage equalization control strategy between the power model, supposes that therefore the situation of each phase is consistent, so do not consider alternate equilibrium control.
2, the control of the electric voltage equalization between the module
Total active power enough the time, be exactly remaining work makes unbalanced energy reasonable distribution between each power model.The method that this patent proposes is exactly: form common DC bus through a plurality of control devices of cutting; Whether be parallel to dc bus by the dc bus capacitor of each power model of the operating state of main circuit decision and carry out energy exchange, thereby realize the electric voltage equalization between the power model.
The annexation of cutting between control device and the main circuit power model is as shown in Figure 4.Through two dc bus capacitor C that cut the control device with power model
1, C
2Forward be together in parallel, unbalanced active power is directly flowed freely on the dc bus of each power model, thereby realize redistributing and the balance of voltage of energy, shown in the shadow region among Fig. 4.
S
1, S
2Four kinds of states are arranged: 00,01,10,11.The dc voltage of supposing power model is U
Dc, then corresponding output voltage is respectively: 0 ,-and U
Dc,+U
Dc, 0.In like manner, be connected the power model of cutting control device two ends, they have 16 kinds of assembled state.
Among Fig. 5, S
1, S
2, S
3, S
4State be 1010, output voltage is respectively+U
Dc,+U
DcAt this moment, switching tube
T
2, S
3And capacitor C
1Constituted a short-circuited conducting sleeve circulation flow path, switching tube
T
3, S
3And capacitor C
2Constituted an other short-circuited conducting sleeve circulation flow path, the two is parallel connection forward.Therefore, cut the switch transistor T of control device
2, T
3Must turn-off, its assembled state is 00; And T
1, T
4The work of opening or turn-offing main circuit and equalizer circuit all do not have influence, its state can be any one in 00,01,10,11, is in free state.For simplifying logical expression, so free state is unified assignment 00.So T
1, T
2, T
3, T
4State be 0000.In like manner, work as S
1, S
2, S
3, S
4State be respectively 1010,1011,1100,1101,0010,0011,0100,0101 o'clock, just exist two forward the parallel connection the short-circuited conducting sleeve circulation flow paths, this moment cut the control device should be operated in isolation, T
1, T
2, T
3, T
4Assembled state be 0000.
Among Fig. 6, S
1, S
2, S
3, S
4State be 1000, output voltage is respectively+U
Dc, 0, this moment do not have the short-circuited conducting sleeve circulation flow path, cut the control device be operated in equal pressure condition, the imbalance power of power model dc bus capacitor flows freely until the balance of voltage, promptly this moment T
1, T
2, T
3, T
4State be 1111.In like manner, work as S
1, S
2, S
3, S
4State be respectively 1000,1001,1110,1111,0000,0001,0110,0111 o'clock, do not have the short-circuited conducting sleeve circulation flow path, cut the control device be operated in equal pressure condition, T
1, T
2, T
3, T
4State be 1111.
This topological operation principle can be summarized as follows: the switching tube of 1, cutting the control device is in identical logic state simultaneously, promptly opens simultaneously, turn-offs simultaneously; 2, it is only relevant with the switching logic of close two power models to cut the logic state of control device, and irrelevant with the size and Orientation of power electric current, and the switching frequency of cutting the control device is the twice of main circuit switch frequency; Cut the control device when 3, having the short-circuited conducting sleeve circulation flow path and can not be operated in equal pressure condition, cut when the control device is operated in equal pressure condition and can not have the short-circuited conducting sleeve circulation flow path; When 4, the switching logic of the switching logic of the right brachium pontis of a last power model and next power model left side brachium pontis is opposite, just necessarily there is the short-circuited conducting sleeve circulation flow path; If 5 have the short-circuited conducting sleeve circulation flow path to exist, just necessarily have two short-circuited conducting sleeve circulation flow paths to exist simultaneously, and these two short-circuited conducting sleeve circulation flow paths are forward parallelly connected; When 6, cutting the control device and be operated in equal pressure condition, forward grading ring circulation flow path exists simultaneously with reverse grading ring circulation flow path but does not work simultaneously.
Can get T according to above-mentioned analysis
1, T
2, T
3, T
4With S
1, S
2, S
3, S
4Between switching logic relation
T
1＝T
2=T
3＝T
4＝S
2⊙S
2
Though this method is to tell about to the electric voltage equalization of two power models, can analogize the system that forms to a plurality of module series connection.Make between the dc bus capacitor of a plurality of modules through cutting the control switch in parallel; The 1st is connected respectively with 2 electric capacity two ends and cuts the control switch, and the 2nd is connected respectively with 3 electric capacity two ends and cuts the control switch, and the 3rd is connected respectively with 4 electric capacity two ends and cuts the control switch; By that analogy, have the individual control switch of cutting of 2 (N-1).
In like manner cutting between available power unit N-1, the N controlled switch Q
N-1Main switch S with power cell N-1, N
2N-3, S
2N-2, S
2N-1, S
2NBetween switching logic relation:
Q
N-1＝S
2N-2⊙S
2N-1
According to the rule of following formula and CPS-SPWM, can draw the generation method of all switching tube drive signals, as shown in Figure 7.
Obviously, the steady-state error of dc voltage is more little, and it is good more promptly to control effect, and grading ring stream is also just more little, and the capacity of cutting the control switch is also just more little, and hardware cost and power loss are also just more little.Under the guarantee of cutting control Pressure and Control algorithm, after system got into stable state, the voltage of each power model can keep stablizing, equilibrium, and the energy loss in the pressure equalizing is approximately zero.The use of this method can not cause too many energy loss, does not influence the whole efficiency of system.Need to prove: any pressure equalizing control method all can cause energy loss, and this is determined by the capacitance voltage disequilibrium.
In addition; The dc voltage that this patent disclosed method only need detect some power models can satisfy the requirement of software algorithm; Thereby significantly needed hardware device and controller resources such as relevant input, conditioning, analysis, calculating are measured in minimizing with dc voltage, therefore all are pressed into originally to be reduced.
Provided a kind of among the present invention based on cutting the chain type STATCOM DC side voltage control method that control is all pressed.And utilize the simulink among the MATLAB that this control method has been carried out simulating, verifying.CMI in the simulation model has adopted 5 power model series connection.Fig. 8 emulation do not add the adverse effect that DC voltage control can cause; Fig. 9 emulation the effect when having only the control of overall active power, energy imbalance has appearred in dc voltage; Figure 10 has provided the DC voltage control effect under this patent method, and the dc voltage of power model gets into stable state rapidly, and steady-state error is almost nil; Figure 11 has provided and has flow through the equalizing current of cutting the control device because of the electric voltage equalization process; Therefore its peak value is no more than 1.5A, and mean value is almost 0, and it is very little to cut voltage, electric current that the control device need bear; The capacity of promptly cutting the control device is very little; Basically do not influence the volume and the cost of system, and all the crushing consumption is very little, can influence the whole efficiency of system.Figure 12 has provided the compensation effect of chain type STATCOM under the new method.Simulation result shows: realized the stable and balanced of chain type STATCOM dc voltage based on cutting the control method that control all presses, can the long-time safety of safeguards system, stable, work efficiently.Can substitute the traditional hardware pressure equalizing control method fully and the control effect is constant, thereby realize the purpose of practicing thrift cost, raising the efficiency, have the important project practice significance.
Claims (7)
1. based on cutting the chain type STATCOM DC side voltage control method that control is all pressed, it is characterized in that, comprise the steps:
1) topology design:
Three-phase Y-connection multi-electrical level inverter joins through three inlet wire inductance and three phase network; Each is made up of inverter n 2H bridge inverter circuit module series connection that has the independent direct current lateral capacitance;
The dc bus capacitor parallel connection of n inverter circuit module: connect a two-way control switch in parallel of cutting respectively between the two ends of i dc bus capacitor and i-1 dc bus capacitor two ends, i=2 ...., n; Whenever, use 2 * (n-1) individual bidirectional switch devices mutually altogether, thereby form public dc bus;
2) control realizes:
A) the threephase load electric current through the current sensor senses target compensation;
B) load current that detects is carried out coordinate transform, needing to obtain each phase current composition of compensation;
C) obtain the phase information of three phase network voltage through the computing of phase-locked loop joint, and its and instruction value multiplied each other obtain the fundamental active current composition, promptly overall active power control algolithm;
D) with above b) and the electric current composition that c) obtains superimposed as final control command, control three-phase inverter output current;
E) logic of the switching tube through the inverter circuit module generates the drive signal of bidirectional switch device; Whether the electric capacity to determine every each power model in mutually is parallel to said public dc bus; Thereby carry out energy exchange through said public dc bus; Unbalanced energy is redistributed, until the capacitance voltage balance between the dc bus capacitor of each power model.
2. method according to claim 1 is characterized in that: the balance of voltage described in the said step e) be meant the voltage of each dc bus capacitor equate basically, or in twos voltage deviation Δ u the regulation scope in.
3. method according to claim 1 is characterized in that: n confirms according to the line voltage grade, gets n＞em/udc; Wherein em is the amplitude of line voltage, and udc is the dc capacitor voltage desired value of each power model.
4. according to the described method of claim 1, it is characterized in that: each phase current composition comprises idle, harmonic wave, uneven composition.
5. according to the described method of claim 1; It is characterized in that; The output current implementation method of control three-phase inverter is in the said step d): detect the three-phase inverter output current; And it and corresponding each control command are mutually done poor, and utilize the modulator approach of phase shift carrier wave to produce corresponding C PS-SPWM signal after regulating through PI, in order to drive the switching tube of each power model.
6. according to the described method of claim 1, it is characterized in that, in the said step e): the said control switch Q that cuts in the inverter circuit module between the two ends of i dc bus capacitor and i-1 the dc bus capacitor two ends
I-1, with i inverter circuit module and i-1 inverter circuit module in switching tube S
2i-3, S
2i-2, S
2i-1, S
2iBetween switching logic relation be: Q
I-1=S
2i-2⊙ S
2i-1
Based on cut that control all presses chain type STATCOM DC voltage control circuit, comprise three-phase Y-connection inverter, bidirectional switch device, controller; It is characterized in that: three-phase Y-connection inverter joins through three inlet wire inductance and three phase network; Each is made up of inverter n 2H bridge inverter circuit module series connection that has the independent direct current lateral capacitance; The dc bus capacitor parallel connection of n inverter circuit module: connect a two-way control switch in parallel of cutting respectively between the two ends of i dc bus capacitor and i-1 dc bus capacitor two ends, i=2 ...., n; Whenever, use 2 * (n-1) individual bidirectional switch devices mutually altogether, thereby form public dc bus; Said cutting in the controller control inverter circuit module between the two ends of i dc bus capacitor and i-1 the dc bus capacitor two ends controlled switch Q
I-1, with i inverter circuit module and i-1 inverter circuit module in switching tube S
2i-3, S
2i-2, S
2i-1, S
2iBetween switching logic relation be: Q
I-1=S
2i-2⊙ S
2i-1
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280820A (en) * | 2013-06-16 | 2013-09-04 | 中国科学院电工研究所 | Direct current side capacitor voltage balance control method of chained static synchronous compensator |
| CN103401462A (en) * | 2013-07-09 | 2013-11-20 | 上海交通大学 | Static synchronous compensator cascaded based on three-level H bridge and voltage source inverter module |
| CN106451496A (en) * | 2016-10-21 | 2017-02-22 | 国网新疆电力公司电力科学研究院 | Method for rapidly restraining low-frequency oscillation of large-scale wind power generation system grid voltage |
| CN107592010A (en) * | 2017-08-05 | 2018-01-16 | 天津大学 | Modular multilevel dynamic switching DC DC transformers |
| CN107911023A (en) * | 2017-11-07 | 2018-04-13 | 天津大学 | The more level dynamic switching DC DC transformers of cascade moduleization |
| CN107910876A (en) * | 2017-11-23 | 2018-04-13 | 广东电网有限责任公司电力科学研究院 | A kind of outer shroud voltage control method and device based on chain type STATCOM |
| CN108199582A (en) * | 2017-12-28 | 2018-06-22 | 天津大学 | The more level DC-DC transformers of multi-port modular |
| CN108233394A (en) * | 2018-02-10 | 2018-06-29 | 国家电网公司 | A kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM |
| CN111342687A (en) * | 2018-12-19 | 2020-06-26 | 南京南瑞继保工程技术有限公司 | Cascaded full-bridge multi-level converter topology with self-voltage-sharing characteristic and control method |
| CN111342690A (en) * | 2020-03-13 | 2020-06-26 | 南京理工大学 | Split capacitor power unit multilevel converter and modulation strategy thereof |
| CN111478608A (en) * | 2020-04-07 | 2020-07-31 | 南京理工大学 | Circuit topology structure for automatically balancing direct-current side voltage and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103280820A (en) * | 2013-06-16 | 2013-09-04 | 中国科学院电工研究所 | Direct current side capacitor voltage balance control method of chained static synchronous compensator |
| CN103401462A (en) * | 2013-07-09 | 2013-11-20 | 上海交通大学 | Static synchronous compensator cascaded based on three-level H bridge and voltage source inverter module |
| CN103401462B (en) * | 2013-07-09 | 2016-02-10 | 上海交通大学 | Based on the single-phase chain static synchronous compensator of three level H bridge cascade |
| CN106451496A (en) * | 2016-10-21 | 2017-02-22 | 国网新疆电力公司电力科学研究院 | Method for rapidly restraining low-frequency oscillation of large-scale wind power generation system grid voltage |
| CN106451496B (en) * | 2016-10-21 | 2019-04-12 | 国网新疆电力有限公司电力科学研究院 | A kind of quick suppressing method of large-scale wind powered generation syst network voltage low-frequency oscillation |
| CN107592010A (en) * | 2017-08-05 | 2018-01-16 | 天津大学 | Modular multilevel dynamic switching DC DC transformers |
| CN107911023A (en) * | 2017-11-07 | 2018-04-13 | 天津大学 | The more level dynamic switching DC DC transformers of cascade moduleization |
| CN107910876B (en) * | 2017-11-23 | 2020-09-01 | 广东电网有限责任公司电力科学研究院 | Outer loop voltage control method and device based on chain type STATCOM |
| CN107910876A (en) * | 2017-11-23 | 2018-04-13 | 广东电网有限责任公司电力科学研究院 | A kind of outer shroud voltage control method and device based on chain type STATCOM |
| CN108199582A (en) * | 2017-12-28 | 2018-06-22 | 天津大学 | The more level DC-DC transformers of multi-port modular |
| CN108233394A (en) * | 2018-02-10 | 2018-06-29 | 国家电网公司 | A kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM |
| CN111342687A (en) * | 2018-12-19 | 2020-06-26 | 南京南瑞继保工程技术有限公司 | Cascaded full-bridge multi-level converter topology with self-voltage-sharing characteristic and control method |
| CN111342687B (en) * | 2018-12-19 | 2021-10-01 | 南京南瑞继保工程技术有限公司 | Cascaded full-bridge multi-level converter topology with self-voltage-sharing characteristic and control method |
| CN111342690A (en) * | 2020-03-13 | 2020-06-26 | 南京理工大学 | Split capacitor power unit multilevel converter and modulation strategy thereof |
| CN111342690B (en) * | 2020-03-13 | 2021-09-03 | 南京理工大学 | Modulation method of split capacitor power unit multilevel converter |
| CN111478608A (en) * | 2020-04-07 | 2020-07-31 | 南京理工大学 | Circuit topology structure for automatically balancing direct-current side voltage and control method thereof |
| CN111478608B (en) * | 2020-04-07 | 2021-11-09 | 南京理工大学 | Circuit topology structure for automatically balancing direct-current side voltage and control method thereof |
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