CN101834538A - Multi-input rectifying circuit for distributed power generation - Google Patents
Multi-input rectifying circuit for distributed power generation Download PDFInfo
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- CN101834538A CN101834538A CN 201010180690 CN201010180690A CN101834538A CN 101834538 A CN101834538 A CN 101834538A CN 201010180690 CN201010180690 CN 201010180690 CN 201010180690 A CN201010180690 A CN 201010180690A CN 101834538 A CN101834538 A CN 101834538A
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Abstract
The invention discloses a multi-input rectifying circuit for distributed power generation, which is formed by connecting n rectifying units, wherein n is not less than 2; each rectifying unit comprises a bridge type rectifier, a second diode and a semiconductor switch; an alternating current input end of each bridge type rectifier is connected with a group of independent alternating current power supply; a positive output end at a direct current side is connected with one end of each semiconductor switch; a negative output end at the direct current side is connected with a positive electrode of the second diode; a negative electrode of the second diode is connected with the other end of the semiconductor switch and used as a positive output end of the rectifying unit; the second diodes of the n rectifying units are connected in series in sequence by the same polarity; positive output ends at the direct current sides of the bridge type rectifiers of adjacent rectifying units are respectively connected together through first diodes; and the polarities of the first diodes are consistent with the second diodes in the rectifying units. The rectifying unit has simple structure, can output relatively-stable direct current voltage under the condition that the input voltage substantially changes by dynamically changing an electric connecting structure of the rectifying units in the running and is applicable for a small-scale wind driven generator group.
Description
Technical field
The present invention relates to a kind of multi-input rectifying circuit of distributed power generation, be applicable to that input voltage range changes power conversion device, especially the wind power generation occasion of distributed power generation greatly.
Background technology
In recent years, be subjected to Global climate change influence and rise in oil price, comprise wind energy, solar energy, biomass energy is subjected to the attention of international community in the utilization of interior regenerative resource, and many countries have proposed clear and definite developing goal, make the renewable energy utilization technology improve constantly.
One of difficult point of renewable energy utilization is that the excursion of input power is very big.Therefore, for distributed generating equipment, that at first will face need have good performance exactly under the input voltage of wide region.For example at the wind power plant of reality, require wind energy conversion system operate as normal in the wind speed range of 3m/s～18m/s, the excursion of input voltage surpasses more than 1/2 of load voltage value like this.Solar power generation is subjected to the influence that intensity of illumination changes, the also very wide model of the output area of voltage.But for the grid-connected system of the electrical network that electric energy is sent into, the inversion of its DC-AC conversion partly requires the direct voltage amplitude stability, can guarantee that the quality of power supply of sending into electrical network reaches requirement.At present, common solution is to add the one-level voltage regulator circuit between rectifier and inverter again, makes direct voltage keep stable.Not only cost improves, efficient is lower but adopt conventional voltage regulator circuit, and its adjustable range is very limited.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structurely, cost is low, the multi-input rectifying circuit that is used for distributed power generation of voltage-regulation wide ranges.
The multi-input rectifying circuit of distributed power generation of the present invention, be formed by connecting by n rectification unit, each rectification unit connects one group of separate single-phase or multi-phase AC power, n 〉=2, it is characterized in that: each rectification unit comprises bridge rectifier, second diode and semiconductor switch, the ac input end of each bridge rectifier connects one group of independently AC power, the DC side positive output end links to each other with an end of semiconductor switch, the DC side negative output terminal links to each other with the positive pole of second diode, the negative pole of second diode links to each other with the other end of semiconductor switch, as the positive output end of rectification unit; Along the polarity series connection, the bridge rectifier DC side positive output end of adjacent rectification unit links together by first diode respectively second diode of n rectification unit successively, and the polarity of first diode is consistent with the polarity of second diode in the rectification unit.
For adjustment output voltage that can be continuous, further feature of the present invention is, first capacitor in parallel between the positive and negative output of bridge rectifier DC side of each rectification unit, at the series circuit that the second diode two ends parallel connection is made up of the inductance and second capacitor, the positive output end self-inductance of rectification unit and the tie point of second capacitor are drawn.
The multi-input rectifying circuit of distributed power generation of the present invention is suitable for the Blast Furnace Top Gas Recovery Turbine Unit (TRT) of a plurality of independent input power supplys, as the small-sized wind power generator group.
Beneficial effect of the present invention is:
The multi-input rectifying circuit of distributed power generation of the present invention is simple in structure, adopt the variable topological principle of Power Electronic Circuit, connecting structure for electrical equipment by dynamic change rectification unit in service, can under the situation that input voltage changes significantly, export metastable direct voltage, very help the operation of wind power generation one class device.
Description of drawings
Fig. 1 is that the multi-input rectifying circuit of distributed power generation constitutes schematic diagram;
Fig. 2 is a kind of rectification unit circuit;
Fig. 3 is another kind of rectification unit circuit;
Fig. 4 is that the multi-input rectifying circuit of distributed power generation is applied to the wind turbine generator example.
Embodiment
With reference to Fig. 1, the multi-input rectifying circuit of distributed power generation is formed by connecting by n rectification unit, and each rectification unit connects one group of separate single-phase or multi-phase AC power, n 〉=2, and each rectification unit comprises bridge rectifier B as shown in Figure 2
r, the second diode D
2With semiconductor switch Q, each bridge rectifier B
rAc input end connect one group of independently AC power, DC side positive output end 1 links to each other with the end of semiconductor switch Q, the DC side negative output terminal 3 and the second diode D
2Positive pole link to each other the second diode D
2Negative pole link to each other with the other end 2 of semiconductor switch Q, as the positive output end of rectification unit; The second diode D of n rectification unit
2Successively along polarity series connection, the bridge rectifier B of adjacent rectification unit
rDC side positive output end 1 is respectively by the first diode D
1Link together the first diode D
1Polarity and rectification unit in the second diode D
2The polarity unanimity.
For adjustment output voltage that can be continuous, each rectification unit also can be as shown in Figure 3, at bridge rectifier B
rThe first capacitor C in parallel between the positive and negative output of DC side
1, at the second diode D
2The two ends parallel connection is by the inductance L and the second capacitor C
2The series circuit of forming, the positive output end 2 self-inductance L and the second capacitor C of rectification unit
2Tie point draw.
Above-mentioned bridge rectifier B
rCan be diode or thyristor rectifier bridge, also can be the full-controlled rectifier-inverter bridge that adopts MOSFET, IGBT.Bridge rectifier B
rCan be single-phase rectifier, also can be three-phase rectifier.B
rThe independently AC power that ac input end connects can be one or several winding output of generator, perhaps other AC power altogether not.
Semiconductor switch Q can adopt electronic power switch devices such as MOSFET, IGBT, IGCT.
The multi-input rectifying circuit of distributed power generation can be that rectification unit shown in Figure 2 constitutes, and also can be that rectification unit shown in Figure 3 constitutes, and can also be that above-mentioned two kinds of rectification units mix composition.
The multi-input rectifying circuit of the distributed power generation that constitutes with two rectification units shown in Figure 2 is an example, and the operation principle of circuit is described:
The ac output end of two generators links to each other with the bridge rectifier ac input end of two rectification units respectively, the direct current positive output end 2 of first rectification unit is the positive output end of multi-input rectifying circuit, and the direct current negative output terminal 3 of second rectification unit is the negative output terminal of multi-input rectifying circuit.The conducting of the semiconductor switch Q of second rectification unit or closed determined the relation between two rectification units: when the Q of second rectification unit is closed, the first diode D between two rectification units
1The second diode D with second rectification unit
2Bearing reverse pressure drop, is series relationship between two rectification units, forms the boost rectifying circuit of units in series; When the semiconductor switch Q of second rectification unit disconnects, the first diode D between two rectification units
1Bridge rectifier B with second rectification unit
rForm a path, the second diode D of second rectification unit
2Bridge rectifier B with first rectification unit
rForming another path, at this moment is relation in parallel between two rectification units, forms the rectification circuit of the expansion current capacity of unit parallel connection.With this reasoning, when having a plurality of rectification unit, the semiconductor switch Q closure of partial rectification unit wherein, the semiconductor switch Q of partial rectification unit disconnects, and then forms the rectification circuit that can either boost and can enlarge current capacity.
In the middle of the application scenario of the reality of distributed power generation, the AC side output voltage excursion of generator is very big.When being under the slow-revving situation, generator output voltage is very low, adopts the mode that series connection is boosted to carry out rectification; Along with the raising of rotating speed, arrive setting voltage value, adopt mode rectification in parallel, reduce voltage, improve current capacity.
If wish voltage is adjusted continuously, can adopt rectification unit shown in Figure 3.Additional inductance and capacitor element form voltage-dropping type BUCK type DC-to-DC regulating circuit.By adopting the method control semiconductor switch Q that adjusts the pwm pulse duty ratio, can realize capacitor C
2Last voltage from zero to capacitor C
1Regulate between the magnitude of voltage, thereby can realize the multi-input rectifying circuit output voltage is adjusted continuously.
Case study on implementation
Multi-input rectifying circuit is applied to the wind turbine generator case as shown in Figure 4, is rectification unit in the frame of broken lines among the figure.Two generators link together by the gear wheel of inscribe pinion and wind energy conversion system, such as the one-axis multi-machine speeding wind turbine generator described in the patent ZL 200720201210.2.In the wind energy conversion system rotation process, two generators keep same leg speed.Every generator is a six-phase motor, and the three-phase output of the 120 degree electrical degrees of wherein being separated by is connected to a rectification unit, amounts to four independent current sources.
As a rule, under low wind speed, the output voltage of wind energy conversion system does not reach the available electric pressure of wind power generation, and wind energy conversion system can only be operated in the pattern that freely turns round, and this part wind energy has been wasted.After having adopted multi-input rectifying circuit, only need be with the first rectification unit semiconductor switch Q_1～the 3rd rectification unit semiconductor switch Q_3 closure, the 4th rectification unit semiconductor switch Q_4 is operated in the PWM pattern voltage is adjusted, the first at this moment all diode D
1With the second diode D
2Be in reverse blocking state, four rectification unit outlet side voltages form series circuit, improve the output voltage grade, surpass 1/4 of rated voltage at the wind energy conversion system output voltage and just can generate electricity by way of merging two or more grid systems.
If the output voltage of generator raises, the duty ratio of the 4th rectification unit semiconductor switch Q_4 is adjusted near zero the time, can change the second rectification unit semiconductor switch Q_2 into disconnection by conducting, the first diode D between first rectification unit and second rectification unit
1The second diode D with second rectification unit
2Change parallel connection into by connecting between the conducting, first rectification unit and second rectification unit, by adjusting the duty ratio of the 4th rectification unit semiconductor switch Q_4, it is stable that system's output voltage keeps.
If the ac output voltage of generator continue to raise, change the 3rd rectification unit semiconductor switch Q_3 into disconnection by conducting, to connect with the 4th rectification unit after first, second and the 3rd rectification unit parallel connection, system still can keep output voltage stabilization.
When the rotating speed of wind energy conversion system reaches rated speed, the 4th rectification unit semiconductor switch Q_4 disconnects fully, and four rectification units are operated in pattern in parallel, regulate rotating speed by the method for variable pitch, keep output voltage stabilization.
Claims (2)
1. the multi-input rectifying circuit of a distributed power generation is formed by connecting by n rectification unit, and each rectification unit connects one group of separate single-phase or multi-phase AC power, and n 〉=2 is characterized in that: each rectification unit comprises bridge rectifier (B
r), the second diode (D
2) and semiconductor switch (Q), each bridge rectifier (B
r) ac input end connect one group of independently AC power, DC side positive output end (1) links to each other with an end of semiconductor switch (Q), DC side negative output terminal (3) and the second diode (D
2) positive pole link to each other the second diode (D
2) negative pole link to each other with the other end (2) of semiconductor switch (Q), as the positive output end of rectification unit; Second diode (the D of n rectification unit
2) successively along polarity series connection, the bridge rectifier (B of adjacent rectification unit
r) DC side positive output end (1) is respectively by the first diode (D
1) link together the first diode (D
1) polarity and rectification unit in the second diode (D
2) the polarity unanimity.
2. the multi-input rectifying circuit of a kind of distributed power generation according to claim 1 is characterized in that: at the bridge rectifier (B of each rectification unit
r) the first capacitor (C in parallel between the positive and negative output of DC side
1), at the second diode (D
2) the two ends parallel connection is by the inductance (L) and the second capacitor (C
3) series circuit formed, the positive output end of rectification unit (2) self-inductance (L) and the second capacitor (C
2) tie point draw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010180690 CN101834538A (en) | 2010-05-21 | 2010-05-21 | Multi-input rectifying circuit for distributed power generation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010180690 CN101834538A (en) | 2010-05-21 | 2010-05-21 | Multi-input rectifying circuit for distributed power generation |
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| Publication Number | Publication Date |
|---|---|
| CN101834538A true CN101834538A (en) | 2010-09-15 |
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|---|---|---|---|
| CN 201010180690 Pending CN101834538A (en) | 2010-05-21 | 2010-05-21 | Multi-input rectifying circuit for distributed power generation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762860A (en) * | 2014-01-28 | 2014-04-30 | 华南理工大学 | N input single-phase N+1 switching group MMC rectifier and control method thereof |
| WO2015055211A1 (en) * | 2013-10-18 | 2015-04-23 | Vestas Wind Systems A/S | Converters for wind turbine generators |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0746846A (en) * | 1993-07-30 | 1995-02-14 | Sanyo Denki Co Ltd | Three-phase rectifier |
| US5461297A (en) * | 1993-05-24 | 1995-10-24 | Analog Modules, Inc. | Series-parallel switchable capacitor charging system |
| RU2251200C2 (en) * | 2002-12-09 | 2005-04-27 | Кожуховский Георгий Васильевич | Method and device (rectifier) for ac-to-dc voltage conversion |
-
2010
- 2010-05-21 CN CN 201010180690 patent/CN101834538A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5461297A (en) * | 1993-05-24 | 1995-10-24 | Analog Modules, Inc. | Series-parallel switchable capacitor charging system |
| JPH0746846A (en) * | 1993-07-30 | 1995-02-14 | Sanyo Denki Co Ltd | Three-phase rectifier |
| RU2251200C2 (en) * | 2002-12-09 | 2005-04-27 | Кожуховский Георгий Васильевич | Method and device (rectifier) for ac-to-dc voltage conversion |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015055211A1 (en) * | 2013-10-18 | 2015-04-23 | Vestas Wind Systems A/S | Converters for wind turbine generators |
| US10483865B2 (en) | 2013-10-18 | 2019-11-19 | Vestas Wind Systems A/S | Converters for wind turbine generators |
| CN103762860A (en) * | 2014-01-28 | 2014-04-30 | 华南理工大学 | N input single-phase N+1 switching group MMC rectifier and control method thereof |
| CN103762860B (en) * | 2014-01-28 | 2016-07-06 | 华南理工大学 | N input single-phase N+1 switches set MMC rectifier and control method thereof |
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Application publication date: 20100915 |