CN1238940C - Circuit for maintaining voltage on DC side in balance - Google Patents
Circuit for maintaining voltage on DC side in balance Download PDFInfo
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- CN1238940C CN1238940C CN 03119677 CN03119677A CN1238940C CN 1238940 C CN1238940 C CN 1238940C CN 03119677 CN03119677 CN 03119677 CN 03119677 A CN03119677 A CN 03119677A CN 1238940 C CN1238940 C CN 1238940C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The present invention relates to a circuit for maintaining voltage on a DC side in balance, which comprises a single-phase inverter, a DC side energy feed circuit, a common DC voltage bus bar, a DC side energy feedback circuit, an auxiliary circuit of a power switch device driving power source, and a common starting DC power source, wherein two input terminals of the DC side energy feed circuit are respectively connected with two output terminals of the single-phase inverter; the positive output terminal of the DC side energy feedback circuit is connected with a positive terminal at the DC side of the single-phase inverter; a negative output terminal is connected with a negative terminal at the DC side of the single-phase inverter. The circuit of the present invention does not need setting DC capacitor voltage value of running of devices, and the devices can adapt to any DC capacitor voltage in theory. When the devices are used, the devices can adapt to the DC capacitor voltage from zero to the maximum allowable DC capacitor voltage. The feedback closed loop control of the DC capacitor voltage does not need, the capacitor accumulated energy of high voltage can automatically flow to a capacitor of low voltage and can not flow in a reverse direction, and the balance control of the voltage can be automatically finished.
Description
Technical field the present invention relates to a kind of circuit that makes dc voltage keep balance, and the dc voltage that relates in particular to a kind of STATCOM that makes chain structure or active filter keeps the circuit of balance, belongs to the electric automatization equipment technical field.
The reactive-load compensation equipment that background technology is traditional has the capacitor of synchronous compensator, fixed capacity, the shunt reactor of switch control etc., these equipment can satisfy the reactive power compensation requirement of certain limit, but they have shortcomings such as response speed is slow, Breakdown Maintenance difficulty.The Static Var Compensator of thyrister form (SVC) has preferable performance, but also has following major defect: 1) owing to it shows the constant-impedance characteristic to the fluctuation of line voltage, thereby can not give full play to its effect when voltage ripple of power network; 2) system is produced more harmonic current.
Along with the appearance of large power semiconductor device (GTO, IGBT, IGCT, IEGT), a kind of novel STATCOM (hereinafter to be referred as STATCOM) has begun to be applied to the Voltage Stability Control of electric power system.STATCOM is made of voltage source inverter, it is equivalent to static synchronous compensator on principle, but dynamic characteristic is much better than synchronous compensator, it has advantages such as the starting nothing is impacted, regulated continuously, response is quick, floor space is little, have great advantage at equal tools in aspect such as transmission line capability that improves the stability of a system, the existing transmission line of raising and inhibition voltage flickers, having become the reactive-load compensation equipment of new generation that various countries competitively develop, is one of important composition parts of flexible AC transmitting system (FACTS) from now on.At present each big electrical network of China have still that power supply deficiency, electric network composition are unreasonable, the stability of a system and the relatively poor problem of power supply quality, it is urgent and significant day by day that the application of jumbo novel static reacance generator becomes.
The main circuit of STATCOM device or active filter generally adopts multipleization of transformer voltage source inverter structure or chain type voltage source inverter structure.Wherein, the chain type voltage source inverter has following superior characteristics: 1) modular construction, 2) realize redundancy running, 3 easily) can realize the equilibrating compensation of unbalanced load, 4) can allow higher system voltage asymmetric, 5) efficient is higher.One of key technology of chain type voltage source inverter is the Balance Control of the dc voltage of its each single-phase inverter.Visible report is the 75MVASTATCOM device of Britain ALSTOM company exploitation at present, it has adopted a kind of two-way inverter to return each dc capacitor with each dc bus capacitor energy inversion to public exchange voltage bus or from public exchange voltage bus transformation energy, thereby controls the method for each dc capacitor voltage balance.But this method control is comparatively complicated.
Summary of the invention the objective of the invention is to propose a kind of circuit that makes dc voltage keep balance, to solve the dc-voltage balance control problem of STATCOM device or active filter, guarantees the normal operation of device.
The dc voltage that makes that the present invention proposes keeps the circuit of balance, comprises single-phase inverter, also comprises:
A DC side energy back circuit, a public direct-current voltage bus, a DC side energy feedback circuit, a device for power switching driving power auxiliary circuit and a public startup DC power supply; Two inputs of DC side energy back circuit join with two outputs of single-phase inverter respectively; The positive output end of DC side energy feedback circuit and the DC side anode of single-phase inverter join, and the positive DC side end of negative output terminal and single-phase inverter joins.
Described DC side energy back circuit is by first single-phase three winding isolation transformers, the first single-phase full bridge rectifier, first filter inductance, first filter capacitor is formed, a winding of first single-phase three winding isolation transformers is wherein received the ac output end of described single-phase inverter, second winding received the ac input end of the first single-phase full bridge rectifier, and the 3rd winding received the ac input end of first single-phase full bridge rectifier in the described device for power switching driving power auxiliary circuit.The direct current output plus terminal of the described first single-phase full bridge rectifier is received an end of described first filter inductance, its direct current output negative terminal is received the negative terminal of described public direct-current voltage bus, and the other end of first filter inductance is received the anode of public direct-current voltage bus.
Described DC side energy feedback circuit is by a DC/AC inverter, second single-phase three winding isolation transformers, and the second single-phase full bridge rectifier and second filter inductance are formed.The direct current input positive and negative terminal of described DC/AC inverter is received the positive and negative terminal of described public direct-current voltage bus respectively, it exchanges output and is connected with first winding of described second single-phase three winding isolation transformers, second winding of second single-phase three winding isolation transformers received the ac input end of single-phase full bridge rectifier, and the 3rd winding received the ac input end of second single-phase full bridge rectifier in the described device for power switching driving power auxiliary circuit.The direct current output plus terminal of the described second single-phase full bridge rectifier is received an end of second filter inductance, its direct current output negative terminal is received the dc bus capacitor negative terminal of described single-phase inverter, and the other end of second filter inductance is received the dc bus capacitor anode of described single-phase inverter.
Described device for power switching driving power auxiliary circuit is by the 3rd, the 4th single-phase full bridge rectifier, and the 3rd, the 4th filter inductance and filtering capacitor are formed.The direct current output plus terminal of the 3rd, the 4th single-phase full bridge rectifier is wherein received an end of the 3rd, the 4th filter inductance respectively, three, the other end of the 4th filter inductance is received the anode of filtering capacitor simultaneously, and the direct current output negative terminal of the 3rd, the 4th single-phase full bridge rectifier is received the negative terminal of filtering capacitor simultaneously.
Single-phase or three-phase alternating-current supply is adopted in described public startup DC power supply input, and output DC source positive and negative terminal is received the positive and negative terminal of public direct-current voltage bus respectively.
The dc voltage that makes that the present invention proposes keeps the circuit of balance, has the following advantages:
Dc capacitor voltage value when 1, not needing the setting device operation, device itself can adapt to dc capacitor voltage arbitrarily in theory, and device can adapt to from 0 dc capacitor voltage to the maximum permission during actual the use.
2, do not need to carry out the feedback closed loop control of dc capacitor voltage, the low capacitor of capacitance energy storage automatic stream voltage that voltage is high and can not reverse flow, the Balance Control of voltage is finished automatically.
The charging work of dc capacitor when 3, starting with finishing device.
Description of drawings Fig. 1 is a main circuit diagram of the present invention
Embodiment Figure 1 shows that based on the phase (A phase) in the STATCOM of chain type inverter circuit or the active filter three-phase chain type inverter circuit.
Among Fig. 1, S1LA, S1LB, S1RA, S1RB and C1 constitute first single-phase inverter (chain unit just) of this chain inverter, and SNLA, SNLB, SNRA, SNRB and CN constitute the individual single-phase inverter of N (N is the natural number greater than 1) of this chain inverter.If the dc voltage of I single-phase inverter is higher than the dc voltage of other single-phase inverters, then have only the energy of this single-phase inverter DC side to deliver to the public direct-current voltage bus by DC side energy back circuit, simultaneously by DC side energy feedback circuit, the energy of public direct-current voltage bus is sent to the lower single-phase inverter dc capacitor of other dc voltages, reaches identical value up to all dc voltages.
The direct current of introducing first single-phase inverter is below surveyed the concrete operation principle of voltage balancing circuit:
T11, B11, L11 and E1 constitute the DC side energy back circuit of first single-phase inverter, and when this inverter direct-flow side voltage was the highest, it was sent to the public direct-current voltage bus with the DC side energy of first single-phase inverter by this circuit; And when this inverter direct-flow side voltage when not being the highest, because the effect of rectifier bridge B11, its energy can not be delivered to the public direct-current voltage bus.PS1, T12, B12 and L14 constitute the DC side energy feedback circuit of first single-phase inverter, and it is sent to the direct current energy on the public direct-current voltage bus dc capacitor of first single-phase inverter.PS1 is a DC/AC converter, and it is transformed into alternating voltage with T12 with the public direct-current voltage isolation, by smoothing reactor energy delivery is given the dc bus capacitor of first single-phase inverter after the B12 rectification.Have only when the dc voltage of certain single-phase inverter when not being the highest, the DC side energy feedback circuit that the energy of public direct-current voltage bus could pass through this single-phase inverter is delivered to the dc bus capacitor of this single-phase inverter.Therefore, when system reaches stable state, the dc voltage of all single-phase inverters will equate.B12, B13, L12, L13 and E11 constitute the device for power switching driving power auxiliary circuit of first single-phase inverter, and the DC power supply V1+/V1-of its output uses for the device for power switching driving power of first single-phase inverter.The operation principle of the direct current survey voltage balancing circuit of other single-phase inverters is same as described above
PS and diode D constitute public startup DC power supply, and it provided electric energy and provide electric energy for the driving power of each single-phase inverter power device for the DC side of each single-phase inverter when device started.
Claims (1)
1, a kind of circuit that makes dc voltage keep balance comprises single-phase inverter, it is characterized in that also comprising:
A DC side energy back circuit, a public direct-current voltage bus, a DC side energy feedback circuit, a device for power switching driving power auxiliary circuit and a public startup DC power supply; Two inputs of described DC side energy back circuit join with two outputs of single-phase inverter respectively; The positive output end of described DC side energy feedback circuit and the DC side anode of described single-phase inverter join, and the positive DC side end of negative output terminal and single-phase inverter joins;
Described DC side energy back circuit is by first single-phase three winding isolation transformers, the first single-phase full bridge rectifier, first filter inductance, first filter capacitor is formed, a winding of first single-phase three winding isolation transformers is wherein received the ac output end of described single-phase inverter, second winding received the ac input end of the first single-phase full bridge rectifier, and the 3rd winding received the ac input end of first single-phase full bridge rectifier in the described device for power switching driving power auxiliary circuit; The direct current output plus terminal of the described first single-phase full bridge rectifier is received an end of described first filter inductance, its direct current output negative terminal is received the negative terminal of described public direct-current voltage bus, and the other end of first filter inductance is received the anode of public direct-current voltage bus;
Described DC side energy feedback circuit is by a DC/AC inverter, second single-phase three winding isolation transformers, and the second single-phase full bridge rectifier and second filter inductance are formed; The direct current input positive and negative terminal of described DC/AC inverter is received the positive and negative terminal of described public direct-current voltage bus respectively, it exchanges output and is connected with first winding of described second single-phase three winding isolation transformers, second winding of second single-phase three winding isolation transformers received the ac input end of single-phase full bridge rectifier, and the 3rd winding received the ac input end of second single-phase full bridge rectifier in the described device for power switching driving power auxiliary circuit; The direct current output plus terminal of the described second single-phase full bridge rectifier is received an end of second filter inductance, its direct current output negative terminal is received the dc bus capacitor negative terminal of described single-phase inverter, and the other end of second filter inductance is received the dc bus capacitor anode of described single-phase inverter;
Described device for power switching driving power auxiliary circuit is by the 3rd, the 4th single-phase full bridge rectifier, and the 3rd, the 4th filter inductance and a filtering capacitor are formed; The direct current output plus terminal of the 3rd, the 4th single-phase full bridge rectifier is wherein received an end of the 3rd, the 4th filter inductance respectively, three, the other end of the 4th filter inductance is received the anode of filtering capacitor simultaneously, and the direct current output negative terminal of the 3rd, the 4th single-phase full bridge rectifier is received the negative terminal of filtering capacitor simultaneously;
Single-phase or three-phase alternating-current supply is adopted in described public startup DC power supply input, and output DC source positive and negative terminal is received the positive and negative terminal of public direct-current voltage bus respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03119677 CN1238940C (en) | 2003-03-20 | 2003-03-20 | Circuit for maintaining voltage on DC side in balance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03119677 CN1238940C (en) | 2003-03-20 | 2003-03-20 | Circuit for maintaining voltage on DC side in balance |
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| Publication Number | Publication Date |
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| CN1437294A CN1437294A (en) | 2003-08-20 |
| CN1238940C true CN1238940C (en) | 2006-01-25 |
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| CN 03119677 Expired - Fee Related CN1238940C (en) | 2003-03-20 | 2003-03-20 | Circuit for maintaining voltage on DC side in balance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2241002B1 (en) * | 2008-01-08 | 2018-06-20 | ABB Schweiz AG | A method for controlling a voltage source converter and a voltage converting apparatus |
| CN102055347A (en) * | 2010-07-22 | 2011-05-11 | 荣信电力电子股份有限公司 | Modular multilevel converter (MMC)-based transformer-free four-quadrant high-voltage variable frequency power supply topological structure |
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Granted publication date: 20060125 Termination date: 20120320 |