CN102255532A - Parallel connection structure for single-phase multi-level PWM (Pulse-Width Modulation) convertors - Google Patents
Parallel connection structure for single-phase multi-level PWM (Pulse-Width Modulation) convertors Download PDFInfo
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- CN102255532A CN102255532A CN201110189622XA CN201110189622A CN102255532A CN 102255532 A CN102255532 A CN 102255532A CN 201110189622X A CN201110189622X A CN 201110189622XA CN 201110189622 A CN201110189622 A CN 201110189622A CN 102255532 A CN102255532 A CN 102255532A
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Abstract
The invention relates to a parallel connection structure for single-phase multi-level PWM (Pulse-Width Modulation) convertors, which is suitable for a distributed power supply, a renewable energy source generating combined grid, charging/discharging and energy storing systems and the like. The parallel connection structure comprises more than two single-phase multi-level PWM convertors and control circuit units thereof, a digital signal processor, a single-phase alternated power circuit and a shared uniform voltage regulator, wherein the shared uniform voltage regulator is composed of a voltage sampling circuit, a voltage sensor, a third summing unit and an outer ring voltage PI (Proportional Integral) regulator. The voltage sampling circuit is in parallel connection with an RL (Resistance Load). The parallel connection structure for single-phase multi-level PWM convertors has the advantages that the problem of the energy flow direction consistency of the single-phase multi-level PWM convertors in a parallel running process is solved, the circulation current is avoided, the equalized flow problem of the single-phase multi-level PWM convertors in the parallel running process is solved, and the parallel connection structure for the single-phase multi-level PWM convertors is suitable for an application situation of a high-power large-scale power electronic convertor.
Description
Technical field
The present invention relates to a kind of parallel-connection structure of single-phase many level PWMs converter, be applicable to that distributed power source, renewable energy power generation are incorporated into the power networks, discharge and recharge and system such as energy storage.
Background technology
Power electronic technology constantly develops in recent years, needing to be widely used in the every field of transformation of electrical energy.At the low power electrical domain of using of low pressure, it is ripe that power electronic technology is tending towards, and in the high-power application, many level power converter technique becomes the core and the hot issue of research gradually.
The multilevel technology is a kind of by improving the new converter that converter self topological structure realizes that high-power is exported, and it need not step-up transformer and all presses transforming circuit.Because the output-voltage levels number increases, and makes output waveform have better harmonic spectrum, the voltage stress that each switching device bore reduces.The multilevel technology has become in the power electronic technology, is transformed to a new research field of research object with high-power.Why multi-level converter becomes the research focus of high-power conversion, is because it has following characteristics:
(1) each power device only bears 1/(n-1) busbar voltage (n is a level number);
(2) increase of level number has improved output voltage waveforms, has reduced output voltage waveforms distortion (THD);
(3) can with lower switching frequency obtain with high switching frequency under the identical output voltage waveforms of two level converters, thereby reduced switching loss;
(4) need not output transformer, reduced the volume and the loss of system greatly.
Many level PWMs converter can effectively suppress the high order harmonic component that PWM control is caused, the low-order harmonic that contains in the stairstepping voltage of PWM control can the minimizing many level PWMs converter output, so the two is in conjunction with obtaining best spectral characteristic.Along with distributed power source, renewable energy power generation is incorporated into the power networks, and discharges and recharges and the development of technology such as energy storage, and many level PWMs converter applications degree is further deepened, and is high-power, that the scale engineering is used is imperative.Yet the method for many level PWMs converter using modular system expansion capacity in parallel has run into problem.Because the general pair closed-loop control strategies that adopt of many level PWMs converter, outer shroud is controlled the VD U of many level PWMs converter
Dc, interior ring control change device net top-cross stream electric current; And satisfying constant control direct voltage U
DcTarget under, the conversion of energy automatic bidirectional, that is: when dc voltage was higher than set-point, in the time of controller action, energy was automatically from DC side flow-reversal device net side; When dc voltage is lower than set-point, in the time of controller action, energy automatically from converter net effluent to DC side.Because given parameter of each converter and the dispersiveness of regulating parameter, may cause the tiny difference of given parameter, and the adjusting parameter is inconsistent, when two or more many level PWMs converters are in parallel, at synchronization, portion convertor may occur and be operated in rectification state, portion convertor is operated in inverter mode.Because the internal resistance of each many level PWMs converter is all minimum, the situation of this partial rectification, part inversion may form big circulation between many level PWMs converter of parallel connection, light then influence the operate as normal of converter, influence the stability of whole system, reduce the performance of system; Heavy then harm, even damage the parallel-connection structure of many level PWMs of three-phase converter.Therefore, generally do not allow many level PWMs converter parallel operation.
Summary of the invention
Technical problem to be solved by this invention provides a kind of consistency problem that can solve many level PWMs converter energy flow direction in parallel, avoid the generation of circulation, and can solve the parallel-connection structure of single-phase many level PWMs converter of many level PWMs converter parallel current-sharing difficult problem.
The technical solution adopted for the present invention to solve the technical problems:
A kind of parallel-connection structure of single-phase many level PWMs converter, it comprises single-phase many level PWMs converter and control circuit unit, digital signal processor and single-phase alternating current source circuit more than 2; It also comprises 1 public unified voltage regulator; Connect described single-phase alternating current source circuit after the input parallel connection of described each single-phase many level PWMs converter and control circuit unit thereof, meet same load R after its output parallel connection
LDescribed unified voltage regulator is made up of voltage sampling circuit, voltage sensor, the 3rd adder and outer loop voltag pi regulator; Described voltage sampling circuit and described load R
LIn parallel, the output of described voltage sampling circuit successively through described voltage sensor, the 3rd adder connect described outside the input of loop voltag pi regulator, the direct current of another each single-phase many level PWMs converter of input termination of described the 3rd adder is exported given voltage U
Dc *, the output of described outer loop voltag pi regulator connects the respective input of the control circuit in described each single-phase many level PWMs converter and the control circuit unit thereof respectively.
Described single-phase alternating current source circuit is by the live wire of single phase alternating current power supply and zero line, resistance R
3, inductance L
1Form; The last underarm junction a point of first brachium pontis of described single-phase many level PWMs converter is successively through resistance R
3, inductance L
1The live wire of order cross streams power supply, the zero line of the last underarm junction b point order cross streams power supply of its second brachium pontis.
Described voltage sampling circuit is by resistance R
1With resistance R
2The bleeder circuit that is composed in series, resistance R
1With R
2Series connection back and described load R
LParallel connection, resistance R
1And resistance R
2Node connect the input of described voltage sensor.
Beneficial effect of the present invention is as follows:
(1) the outer shroud voltage regulator of single-phase many level PWMs converter of each parallel connection is independent, form a public unified voltage regulator, solve the consistency problem that each single-phase many level PWMs converter energy flows to when parallel running, avoided the generation of circulation.
(2) control voltage as the given component of each single-phase many level PWMs converter active current in parallel with the output of unifying voltage regulator, power factor or net side reactive power are scaled the given component of reactive current, each single-phase many level PWMs converter using closed loop current control in parallel realizes current sharing control, the equal flow problem when having solved each single-phase many level PWMs converter parallel running simultaneously.
(3) the present invention is applicable to high-power, scale electronic power conversion application scenario.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is typical single-phase three-level pwm inverter main circuit topology diagram;
Fig. 3 is the theory diagram of the control circuit of single-phase many level PWMs converter;
Fig. 4 is the embodiment block diagram of single-phase many level PWMs converter multiple unit parallel connection.
Embodiment
Present embodiment is the parallel-connection structure (referring to Fig. 1-4) of single-phase many level PWMs converter (single-phase three-level pwm converter).
As shown in Figure 1, present embodiment comprises single-phase many level PWMs converter and control circuit unit and the digital signal processor more than 2; Also comprise 1 public unified voltage regulator; Connect same single-phase alternating current source circuit after the input parallel connection of described each single-phase many level PWMs converter and control circuit unit thereof, meet same load R after its output parallel connection
LDescribed unified voltage regulator is made up of voltage sampling circuit 1, voltage sensor 2, the 3rd adder 3 and outer loop voltag pi regulator 4; Described voltage sampling circuit 1 and described load R
LIn parallel, the output of described voltage sampling circuit 1 successively through described voltage sensor 2, the 3rd adder 3 connect described outside the input of loop voltag pi regulator 4, the direct current of another each single-phase many level PWMs converter of input termination of described the 3rd adder 3 is exported given voltage U
Dc *, the output of described outer loop voltag pi regulator 4 connects the respective input of the control circuit in described each single-phase many level PWMs converter and the control circuit unit thereof respectively.。
Fig. 2 is typical single-phase many level PWMs converter topology circuit, power switch pipe (V
1~ V
8) for containing the IGBT of inverse parallel diode, V
1And V
3Constitute first upper arm, V
5And V
7Constitute first underarm, V
2And V
4Constitute second upper arm, V
6And V
8Constitute second underarm, first upper arm and the series connection of first underarm constitute first brachium pontis, and second upper arm and the series connection of second underarm constitute second brachium pontis, VD
1And VD
3Be first clamping diode, VD
2And VD
4Be second clamping diode, DC side filtering capacitor C
1, C
2, the AC power live wire is successively through resistance R
3, linear inductance L
1Insert the last underarm junction a point of first brachium pontis, zero line directly connects the last underarm junction b point of second brachium pontis.
The parallel-connection structure of described single-phase many level PWMs converter be meant by unit 1 in parallel, unit in parallel 2 ..., the circuit that composes in parallel of unit N in parallel, wherein each unit in parallel is made up of single-phase many level PWMs converter and control circuit thereof.Be characterized in: the AC side of each convertor circuit is taken from same AC power circuit, and DC side parallel constitutes dc bus, shares DC load R jointly
L
Figure 3 shows that the control block diagram of single-phase many level PWMs converter.Control method adopts two closed-loop controls based on the vector control technology of line voltage orientation, and outer shroud is a voltage control loop, and interior ring is the current on line side control ring.Now be described in detail as follows:
Outer shroud with the VD signal as the Voltage Feedback amount, through R
1, R
2Bleeder circuit 1 dividing potential drop of forming, voltage sensor 2 obtain, and export given voltage U with direct current
Dc *Be the constant target, carry out ratio-integral processing, output Control current i through outer loop voltag pi regulator 4
d *Interior ring is divided into d shaft current adjuster 6 and q shaft current adjuster 5, and its process is to get converter ac-side current signal, utilizes
Signal generator 10 and α β/dq conversion 11, decoupling zero obtain and the equidirectional direct-current component i of voltage resultant vector
d, the direct-current component i vertical with the voltage resultant vector
qBecause i
dEquidirectional with the voltage resultant vector, so i
dBe called the active component of current, control i
dThe active power of scalable converter, and i
qBe called the reactive component of current, control i
qThe reactive power of scalable converter; Get converter AC side voltage and insert phase-locked loop 8 and space vector phase calculation link 9, space vector phase calculation link 9 output sines, cosine signal (sin θ), (cos θ) are to α β/dq converter 11 and dq/α β converter 14, and dq/α β converter 14 is connected with many level PWMs converter through α β/abc converter 15, the SVPWM signal generator 16 of series connection again; The converter AC side
Signal generator 10 connects α β/dq converter 11 again, the α β/output of dq converter 11 two-way, wherein i
qSignal becomes u through first adder 12, q shaft current adjuster 5 with dq/α β converter 14
αOutput, i
dSignal becomes u through second adder 13, d shaft current adjuster 6 with dq/α β converter 14
βOutput; u
α, u
βGenerate u through abc/ α β converter 15
a *, u
b *, u
c *u
a *, u
b *, u
c *Behind SVPWM signal generator 16, export the control signal of six road PWM inverter brachium pontis power tubes.R in parallel between the positive and negative bus of direct current
1, R
2The bleeder circuit of forming 1, bleeder circuit 1 is connected with second adder 13 through overvoltage sensor 2, the 3rd adder 3, outer loop voltag pi regulator 4.Described voltage sensor 2 adopts the Hall voltage transducer, and its model is SKIT_V25V6.Described the 3rd adder 3 and outer loop voltag pi regulator 4 realize that by software described software is installed in the described digital signal processor, and the model of described digital signal processor is 2812.
The concrete operation process now is described in detail as follows:
1. pass through the phase place of phase-locked loop circuit 8 real-time detection of grid electromotive force e, determine the angular position theta of voltage oriented vectors through space vector phase calculation link 9, try to achieve sine, cosine function sin θ, cos θ and it is exported in α β/dq converter 11 and the dq/α β converter 14.
2. α β/dq converter 11 is realized the conversion of α β two-phase rest frame to dq rotation synchronously ending coordinate system, with sinusoidal component i under the rest frame according to sine, cosine function sin θ, the cos θ of the θ of input
α, i
βFinally be transformed to DC component i under the synchronous rotating frame
d, i
q
3. the output i of loop voltag pi regulator 4 in addition
d *As the given parameter of d shaft current adjuster 6, the DC component i that the alternating current decoupling zero obtains
dAs the feedback of d shaft current adjuster 6, the output i of outer loop voltag pi regulator 4
d *The DC component i that obtains with the alternating current decoupling zero
dElder generation is through second adder 13, at process d shaft current adjuster 6 computings output control voltage u
d *
4. the reactive current component i that converts with reactive power or power factor
q *As the given parameter of q shaft current adjuster 5, the DC component i that the alternating current decoupling zero obtains
qAs the feedback of q shaft current adjuster 5, reactive current component i
q *The DC component i that obtains with the alternating current decoupling zero
qElder generation is through first adder 12, at process q shaft current adjuster 5 output control voltage u
q *
5. dq/α β converter 14 conversion are according to sine, cosine function sin θ, the cos θ of the θ of input, realize of the conversion of dq rotation synchronously ending coordinate system, with the control voltage u of d shaft current adjuster, the output of q shaft current adjuster under the synchronous rotating frame to α β two-phase rest frame
d *, u
q *Be transformed to sinusoidal component u under the rest frame
α, u
β
6. sinusoidal component u under the two-phase rest frame
α, u
βFurther the two-phase rest frame is transformed to the three phase static coordinate system, the pwm converter net side three-phase voltage u that obtains expecting through abc/ α β converter 15
a *, u
b *, u
c *By after 16 pulse-width modulations of SVPWM signal generator, export the control signal of many level PWMs converter brachium pontis power tube again.
Because after the decoupling zero, the active power of single-phase many level PWMs converter is directly proportional with d shaft current component, reactive power is directly proportional with q shaft current component, and its rule satisfies relational expression (1), wherein U
GBe electrical network phase voltage effective value.
Therefore, control d shaft current component scalable active power is DC bus-bar voltage, control q shaft current component scalable reactive power or power factor realize the direct voltage of pwm converter and the independent control of net side reactive power, and make system have good static state and dynamic property.
Fig. 4 is the embodiment block diagram of single-phase many level PWMs converter parallel-connection structure.The parallel-connection structure of described many level PWMs of multiple unit converter by unit 1 in parallel, unit in parallel 2 ..., unit N in parallel forms.Wherein each unit in parallel is made up of single-phase many level PWMs converter and control circuit thereof.Each many level PWMs converter AC side also connects same AC power; Each many level PWMs converter direct current output-parallel is to dc bus, and the key technology of its parallel running is:
The outer shroud voltage regulator of single-phase many level PWMs converter of each parallel connection is independent 1., form a public unified voltage regulator, specifically be as the Voltage Feedback amount, through R with the VD signal
1, R
2Bleeder circuit 1 dividing potential drop of forming, voltage sensor 2 obtain the Voltage Feedback amount, export given voltage U with direct current
Dc *Be the constant target, through outside loop voltag pi regulator 4 carry out ratio-integral processing after output Control current i
d *, as the given signal of each in parallel single-phase many level PWMs converter closed loop current control d shaft current adjuster 6;
2. the closed loop current control of unit 1 in parallel is divided into d shaft current adjuster 6 and q shaft current adjuster 5, to unify the output Control current i of voltage regulator
d* as the given signal of d shaft current adjuster 6, the DC component i that the alternating current decoupling zero obtains
dAs the feedback of d shaft current adjuster 6, through d shaft current adjuster 6 output control voltage u
d*; Reactive current component i with reactive power or power factor conversion
q* as the given signal of q shaft current adjuster 5, the DC component i that the alternating current decoupling zero obtains
qAs the feedback of q shaft current adjuster 5, through q shaft current adjuster 5 output control voltage u
q*, the Current Vector Control process of unit 1 in parallel is specifically identical with the interior circular current vector control of single-phase many level PWMs converter among above-mentioned Fig. 3.Unit 2 in parallel is identical with unit in parallel 1 to the operation principle of unit N in parallel.
Like this, on the one hand, the dispersiveness that has overcome the given parameter of single-phase many level PWMs converter in parallel and regulated parameter, avoided that portion convertor is operated in rectification state in the parallel running process, portion convertor is operated in the active inversion state, got rid of form the factor of circulation between single-phase many level PWMs converter in parallel; On the other hand, the control strategy of single-phase many level PWMs converter of each parallel connection is reduced to the control of net top-cross stream current closed-loop, realized the sharing control between parallel connection converter in fact, thereby, the invention solves the consistency problem that each single-phase many level PWMs converter energy flows to when parallel running, avoided the generation of circulation; Simultaneously, also solved the current-sharing difficult problem of single-phase many level PWMs converter parallel connection.The parallel-connection structure of single-phase many level PWMs converter and control method thereof are applicable to high-power scale electronic power conversion application scenario.
Claims (4)
1. the parallel-connection structure of single-phase many level PWMs converter, it comprises single-phase many level PWMs converter and control circuit unit, digital signal processor and single-phase alternating current source circuit more than 2; It is characterized in that it also comprises 1 public unified voltage regulator; Connect described single-phase alternating current source circuit after the input parallel connection of described each single-phase many level PWMs converter and control circuit unit thereof, meet same load R after its output parallel connection
LDescribed unified voltage regulator is made up of voltage sampling circuit (1), voltage sensor (2), the 3rd adder (3) and outer loop voltag pi regulator (4); Described voltage sampling circuit (1) and described load R
LIn parallel, the output of described voltage sampling circuit (1) successively through described voltage sensor (2), the 3rd adder (3) connect described outside the input of loop voltag pi regulator (4), the direct current of another each single-phase many level PWMs converter of input termination of described the 3rd adder (3) is exported given voltage U
Dc *, the output of described outer loop voltag pi regulator (4) connects the respective input of the control circuit in described each single-phase many level PWMs converter and the control circuit unit thereof respectively.
2. the parallel-connection structure of single-phase many level PWMs converter according to claim 1 is characterized in that described single-phase alternating current source circuit is by the live wire of single phase alternating current power supply and zero line, resistance R
3, inductance L
1Form; The last underarm junction a point of first brachium pontis of described single-phase many level PWMs converter is successively through resistance R
3, inductance L
1The live wire of order cross streams power supply, the zero line of the last underarm junction b point order cross streams power supply of its second brachium pontis.
3. according to the parallel-connection structure of the described single-phase many level PWMs converter of claim 2, it is characterized in that described voltage sampling circuit (1) is by resistance R
1With resistance R
2The bleeder circuit that is composed in series, resistance R
1With R
2Series connection back and described load R
LParallel connection, resistance R
1And resistance R
2Node connect the input of described voltage sensor (2).
4. the parallel-connection structure of many level PWMs of three-phase converter according to claim 3 is characterized in that described voltage sensor (2) adopts the Hall voltage transducer, and its model is SKIT_V25V6.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013004067A1 (en) * | 2011-07-07 | 2013-01-10 | 河北省电力研究院 | Parallel structure of three-phase multi-level pwm converters |
| CN103516239A (en) * | 2012-06-29 | 2014-01-15 | 通用电气公司 | Improved modulating system and method for converter |
| WO2016112747A1 (en) * | 2015-01-13 | 2016-07-21 | 艾德克斯电子（南京）有限公司 | Parallel current-sharing device and control method of bus without current sharing |
| CN107959434A (en) * | 2017-10-12 | 2018-04-24 | 安徽华腾电气有限公司 | And net state place an order phase energy accumulation current converter PQ control method |
| CN108039829A (en) * | 2017-12-20 | 2018-05-15 | 中国人民解放军海军工程大学 | A kind of double more level synchronization control methods for pulse power inverter |
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| CN201312265Y (en) * | 2008-10-21 | 2009-09-16 | 烟台鲁宝钢管有限责任公司 | Silicon-controlled rectifying device |
| CN101951174A (en) * | 2010-09-11 | 2011-01-19 | 天津大学 | Constant-frequency direct power control method for PWM converter under condition of power grid voltage imbalance |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201312265Y (en) * | 2008-10-21 | 2009-09-16 | 烟台鲁宝钢管有限责任公司 | Silicon-controlled rectifying device |
| CN101951174A (en) * | 2010-09-11 | 2011-01-19 | 天津大学 | Constant-frequency direct power control method for PWM converter under condition of power grid voltage imbalance |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013004067A1 (en) * | 2011-07-07 | 2013-01-10 | 河北省电力研究院 | Parallel structure of three-phase multi-level pwm converters |
| CN103516239A (en) * | 2012-06-29 | 2014-01-15 | 通用电气公司 | Improved modulating system and method for converter |
| WO2016112747A1 (en) * | 2015-01-13 | 2016-07-21 | 艾德克斯电子（南京）有限公司 | Parallel current-sharing device and control method of bus without current sharing |
| CN107959434A (en) * | 2017-10-12 | 2018-04-24 | 安徽华腾电气有限公司 | And net state place an order phase energy accumulation current converter PQ control method |
| CN108039829A (en) * | 2017-12-20 | 2018-05-15 | 中国人民解放军海军工程大学 | A kind of double more level synchronization control methods for pulse power inverter |
| CN108039829B (en) * | 2017-12-20 | 2020-05-19 | 中国人民解放军海军工程大学 | Dual-multilevel synchronous control method for pulse power inverter |
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Application publication date: 20111123 |