CN1305198C - Direct current voltage balancing circuit of reactive generating device based on chained invertor - Google Patents
Direct current voltage balancing circuit of reactive generating device based on chained invertor Download PDFInfo
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- CN1305198C CN1305198C CNB2003101153932A CN200310115393A CN1305198C CN 1305198 C CN1305198 C CN 1305198C CN B2003101153932 A CNB2003101153932 A CN B2003101153932A CN 200310115393 A CN200310115393 A CN 200310115393A CN 1305198 C CN1305198 C CN 1305198C
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The present inevitable relates to a direct current voltage balance circuit of a reactive generator, which is based on chain inverters and belongs to the technical field of electric automation equipment. The present invention is characterized in that each single-phase inverter comprises a voltage measurer, a minimum capacitor voltage solving device, a pulse width regulator and a pulse amplifier, wherein the voltage measurer is used for measuring voltage at both ends of a capacitor at the direct current side of each inverter, and the minimum capacitor voltage solving device is used for determining the minimum value of the voltage of the capacitor at the direct current side of each single-phase inverter and allowing the minimum value to be output to the pulse width regulator as reference voltage. The pulse width regulator is used for carrying out error regulation to voltage measuring signals of the capacity at the direct current side and outputting pulse width modulating signals, and the pulse amplifier is used for amplifying the pulse width modulating signals and regulating the voltage at both ends of the capacitor at the direct current side of the inverter. The direct current voltage balance circuit can effectively compensate for the unbalance of the voltage at the direct current side of the reactive generator so that the generator can normally run.
Description
Technical field
Dc-voltage balance circuit based on the reactive generating device of chain inverter belongs to the electric automatization equipment technical field.
Background technology
Traditional reactive-load compensation equipment has the shunt reactor etc. of capacitor, the switch control of synchronous compensator, fixed capacity, and 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), STATCOM (STATCOM) has begun to be applied to power system voltage stabilization control.Reactive generating device or STATCOM are 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 reactive generating device or STATCOM device 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 75MVA STATCOM 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.This method control is comparatively complicated.
Summary of the invention
The object of the present invention is to provide a kind of dc-voltage balance circuit of the reactive generating device based on chain inverter,, guarantee the normal operation of device to solve dc-voltage balance control problem.
The invention is characterized in: each single-phase inverter all contains:
Pressure measuring instrument: the voltage that is used to measure inverter direct-flow side electric capacity two ends;
Minimum capacity voltage is asked for device: be used for the minimum value of the single-phase inverter dc capacitor voltage value at definite place, and this minimum value is outputed to pulse-width modulator as reference voltage; Minimum capacity voltage is asked for device and is made up of voltage follower, diode and a resistance; The positive input terminal of described voltage follower connects the output of described pressure measuring instrument, the negative input end of voltage follower connects the anode of described diode and an end of described resistance, the output that this negative input end is also asked for device as this minimum capacity voltage connects an input of described pulse-width modulator, and this negative input end also links to each other with the minimum capacity voltage output of asking for device in other each single-phase inverter; The output of voltage follower connects the negative electrode of described diode; The other end of described resistance connects the control positive source;
Pulse-width modulator: be used for dc capacitor voltage measuring-signal and described reference voltage are carried out error adjusting and output pulse width modulation signal; Two input receives the output voltage and the described reference voltage of described pressure measuring instrument respectively;
Pulse amplifier: be used to amplify pulse-width signal, and regulate the voltage at inverter direct-flow side electric capacity two ends; Its input connects the output of described pulse-width modulator, and its output connects described dc bus capacitor two ends.
Described pulse-width modulator contains error amplifier, voltage inverter, triangular-wave generator and voltage comparator, described dc capacitor voltage measuring-signal is imported described voltage inverter, the described error amplifier of the common input of the output signal of described voltage inverter and described reference voltage, the described voltage comparator of the common input of the triangular signal of the output signal of described error amplifier and described triangular-wave generator output, by described voltage comparator output pulse width modulation signal to above-mentioned pulse amplifier; Described triangular-wave generator by vibration chip takes place and constant-current source constitutes.
Described pulse amplifier contains driver module, power semiconductor switch and with the diode and the power resistor of described power semiconductor switch parallel connected in reverse phase, the input of described driver module connects the output of above-mentioned pulse-width modulator, its output connects the gate pole of described power semiconductor switch, the collector electrode of this power semiconductor switch is connected and is connected to the positive pole of described inverter direct-flow side electric capacity behind the described power resistor, its emitter connects the negative pole of described inverter direct-flow side electric capacity, the described diode of parallel connected in reverse phase between the collector and emitter of described power semiconductor switch.
Described power semiconductor switch is an igbt.The model of described igbt is BSM50GB170DN2.The model of described driver module is 2SD315A.
Dc-voltage balance circuit proposed by the invention is used in evidence, and effectively the imbalance of compensating reactive power generating means dc voltage can normally be moved device.
Description of drawings
Fig. 1 is the theory diagram of the dc capacitor voltage balancing circuitry of a phase chain inverter;
Fig. 2 is the schematic diagram of single-phase inverter dc-voltage balance circuit.
Embodiment:
Accompanying drawings the specific embodiment of the present invention.
See Fig. 1, the figure shows the theory diagram of the dc-voltage balance circuit of the phase in the reactive generating device three-phase chain type inverter circuit.Among the figure, 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.The dc voltage measurement instrument will be measured the voltage at capacitor C n (n refers to N the n in the single-phase inverter) two ends, deliver to pulse-width modulator and reference voltage V Rn compares, and output regulation signal Pn (pulse-width signal PWM), after the pulse amplifier amplifies, output to the two ends of capacitor C n, thus control capacitance voltage is identical with set point or the scope of certain setting about set point in.
DC voltage side balancing circuitry with first single-phase inverter is that example describes, and sees Fig. 2.This dc-voltage balance circuit comprises:
1) measure the pressure measuring instrument of capacitor C 1 both end voltage: the present invention uses Hall voltage measuring instrument LV100 to measure, and the direct voltage at capacitor C 1 two ends that record is converted to linear signal V1, measuring instrument employing ± 15V D.C. regulated power supply.
2) minimum capacity voltage is asked for device: be used for following the tracks of the minimum value of each phase inverter dc capacitor voltage value, it contains: voltage follower U5B, diode D2 and resistance R 14; Because the unidirectional conducting effect of diode D2, minimum voltage in each phase inverter dc capacitor voltage is followed and is outputed to the output that minimum capacity voltage is asked for device, and other bigger direct voltages can cause its corresponding U5B output just saturated, isolated and to export by diode D2, thereby can ask for minimum capacitance voltage.
3) pulse-width modulator: the signal of voltage measurement signal V1 by voltage inverter U1B (model is TL072) anti-phase after, with reference voltage V R1 and by error amplifier U1A (model is TL072) error signal is amplified, compare back output pulse width modulated pulse signal P1 with triangular wave by voltage comparator U2 (model is LM311) then.Triangular wave is formed jointly by multi-functional vibration generation chip U3 (model is NE555) and constant-current source.As Fig. 2, R5-R9, D3, Q1, C6 constitute constant-current source, and the output current of this constant-current source equals to flow through the electric current of R5 equal R6 and go up voltage because R5 goes up voltage, and R6 to go up voltage be constant by R6 with the decision of R7 dividing potential drop, so R5 upward electric current be constant.Constant-current source output constant current charges to capacitor C 5 to 6 and 7 pin of U3, and when the last voltage of C5 was charged to certain voltage, multi-functional vibration generation chip U3 discharged to C5 by 6 and 7 pin, thereby formed triangular wave.Reference voltage V R1 equals d. c. voltage signal VDM minimum in the dc voltage of all single-phase inverters in this phase chain type inverter circuit.If the dc capacitor voltage of certain single-phase inverter becomes greater than reference voltage, then one of error amplifier U1A output becomes big signal, make the pulsewidth of the width-modulation pulse signal P1 of U2 output become big, thereby make power semiconductor switch S1 ON time elongated, dc bus capacitor is elongated discharge time, dc voltage is descended, thereby suppressed the unbalanced trend of dc voltage.
4) pulse amplifier: pulse voltage is amplified with driver module U4 (model is 2SD315A), so that the gate pole of driving power semiconductor switch S1, make power semiconductor switch S1 conducting and end, the power semiconductor switch S1 that the present invention selects is an insulated gate bipolar transistor IGBT, model is BSM50GB170DN2, S1 works in the pwm switch mode, regulates the equivalent resistance that is connected in parallel on the dc capacitor C1.The S1 ON time is long more, and electric capacity is long more discharge time by power resistor, and equivalent average discharge current is big more, and equivalent parallel resistance is more little.Answer diode D1 of inverse parallel between the S1 collector and emitter, prevent from reverse voltage to occur between the power switch collector and emitter.Power resistor RD1 and the power semiconductor switch S1 back that is connected in series is in parallel with capacitor C 1, and its equivalent resistance is directly proportional with power switch conducting duty ratio.
Claims (6)
1, based on the dc-voltage balance circuit of the reactive generating device of chain inverter, it is characterized in that each single-phase inverter all contains:
Pressure measuring instrument: the voltage that is used to measure inverter direct-flow side electric capacity two ends;
Minimum capacity voltage is asked for device: be used for the minimum value of the single-phase inverter dc capacitor voltage value at definite place, and this minimum value is outputed to pulse-width modulator as reference voltage; Minimum capacity voltage is asked for device and is made up of voltage follower, diode and a resistance; The positive input terminal of described voltage follower connects the output of described pressure measuring instrument, the negative input end of voltage follower connects the anode of described diode and an end of described resistance, the output that this negative input end is also asked for device as this minimum capacity voltage connects an input of described pulse-width modulator, and this negative input end also links to each other with the minimum capacity voltage output of asking for device in other each single-phase inverter; The output of voltage follower connects the negative electrode of described diode; The other end of described resistance connects the control positive source;
Pulse-width modulator: be used for dc capacitor voltage measuring-signal and described reference voltage are carried out error adjusting and output pulse width modulation signal; Two input receives the output voltage and the described reference voltage of described pressure measuring instrument respectively;
Pulse amplifier: be used to amplify pulse-width signal, and regulate the voltage at inverter direct-flow side electric capacity two ends; Its input connects the output of described pulse-width modulator, and its output connects described dc bus capacitor two ends.
2, the dc-voltage balance circuit of the reactive generating device based on chain inverter as claimed in claim 1, it is characterized in that, described pulse-width modulator contains error amplifier, voltage inverter, triangular-wave generator and voltage comparator, described dc capacitor voltage measuring-signal is imported described voltage inverter, the described error amplifier of the common input of the output signal of described voltage inverter and described reference voltage, the described voltage comparator of the common input of the triangular signal of the output signal of described error amplifier and described triangular-wave generator output, by described voltage comparator output pulse width modulation signal to above-mentioned pulse amplifier; Described triangular-wave generator by vibration chip takes place and constant-current source constitutes.
3, the dc-voltage balance circuit of the reactive generating device based on chain inverter as claimed in claim 1, it is characterized in that, described pulse amplifier contains driver module, power semiconductor switch and with the diode and the power resistor of described power semiconductor switch parallel connected in reverse phase, the input of described driver module connects the output of above-mentioned pulse-width modulator, its output connects the gate pole of described power semiconductor switch, the collector electrode of this power semiconductor switch is connected and is connected to the positive pole of described inverter direct-flow side electric capacity behind the described power resistor, its emitter connects the negative pole of described inverter direct-flow side electric capacity, the described diode of parallel connected in reverse phase between the collector and emitter of described power semiconductor switch.
4, the dc-voltage balance circuit of the reactive generating device based on chain inverter as claimed in claim 3 is characterized in that described power semiconductor switch is an igbt.
5, the dc-voltage balance circuit of the reactive generating device based on chain inverter as claimed in claim 4 is characterized in that the model of described igbt is BSM50GB170DN2.
6, the dc-voltage balance circuit of the reactive generating device based on chain inverter as claimed in claim 3 is characterized in that the model of described driver module is 2SD315A.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101153932A CN1305198C (en) | 2003-06-18 | 2003-11-21 | Direct current voltage balancing circuit of reactive generating device based on chained invertor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN03137554.5 | 2003-06-18 | ||
| CN03137554 | 2003-06-18 | ||
| CNB2003101153932A CN1305198C (en) | 2003-06-18 | 2003-11-21 | Direct current voltage balancing circuit of reactive generating device based on chained invertor |
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| CN1514525A CN1514525A (en) | 2004-07-21 |
| CN1305198C true CN1305198C (en) | 2007-03-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102822763A (en) * | 2010-04-13 | 2012-12-12 | 株式会社日立制作所 | Power converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100347922C (en) * | 2004-09-10 | 2007-11-07 | 清华大学 | Electric energy mass and powerless compensation combination controller |
| CN1933274B (en) * | 2006-09-30 | 2011-04-13 | 中国科学院电工研究所 | H bridge cascade active electric filter DC side capacitance-voltage equalizing controlling method |
| DE102009007476A1 (en) * | 2009-01-30 | 2010-08-05 | Siemens Aktiengesellschaft | Method for balancing the DC link voltages in a self-commutated multilevel reactive current compensator and self-commutated multilevel reactive current compensator |
| CN102353832B (en) * | 2011-09-09 | 2013-11-20 | 上海交通大学 | Multi-way direct current voltage detection system of cascade inverter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5329222A (en) * | 1992-11-30 | 1994-07-12 | Westinghouse Electric Corporation | Apparatus and method for dynamic voltage restoration of utility distribution networks |
| CN1315768A (en) * | 2000-03-31 | 2001-10-03 | 三菱电机株式会社 | Adjustable dc voltage controller for non-transformer reactive series compensator |
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- 2003-11-21 CN CNB2003101153932A patent/CN1305198C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5329222A (en) * | 1992-11-30 | 1994-07-12 | Westinghouse Electric Corporation | Apparatus and method for dynamic voltage restoration of utility distribution networks |
| CN1315768A (en) * | 2000-03-31 | 2001-10-03 | 三菱电机株式会社 | Adjustable dc voltage controller for non-transformer reactive series compensator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102822763A (en) * | 2010-04-13 | 2012-12-12 | 株式会社日立制作所 | Power converter |
| CN102822763B (en) * | 2010-04-13 | 2014-10-22 | 株式会社日立制作所 | Power converter |
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