CN101645605A - Modularized parallel combination type high-power photovoltaic synchronization contravariant device, control system and control method thereof - Google Patents
Modularized parallel combination type high-power photovoltaic synchronization contravariant device, control system and control method thereof Download PDFInfo
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Abstract
The invention provides a modularized parallel combination type high-power photovoltaic synchronization contravariant device, a control system and a control method thereof. The invention is characterized in that the device is provided with a first contravariant unit module and other contravariant unit modules which have an identical internal structure and are connected in parallel, all the contravariant unit modules share a DC bus, and all the AC output ends of the contravariant unit modules are connected to a power grid directly, or connected to an AC bus of the power grid through an output transformer; the parallel contravariant unit modules adopt a three-phase contravariant structure, and the contravariant output sides are subject to three-phase inductance followed by mutual connection in parallel. In the invention, each contravariant unit module has independent control protection function, thus greatly reducing actually output current ripple wave content under the same capacity andcarrier wave frequency, and the contravariant unit modules have the same structure, thus capable of exchanging with each other and facilitating dilatation and maintenance.
Description
Technical field
The present invention relates to high-power photovoltaic synchronization contravariant device, its control system and control method.
Background technology
Along with the progress of solar-grade silicon material refinement technique and the continuous decline of cost; the solar photovoltaic grid-connection generating will be developed rapidly; the solar photovoltaic grid-connection generating of scale is a development in future trend; large-scale or oversized pv grid-connected plant will get more and more, and this class power station needs the powerful control contravariant equipment that is incorporated into the power networks.
Though the parallel network reverse device can the multi-machine parallel connection operation be realized high-power, but adopt conventional parallel network reverse and parallel operation mode, as by selecting high-power switch device for use, or device is organized mode in parallel more, then the pulsation meeting of its grid-connected current is bigger, causes the filter unit burden heavier, has increased the volume and the design difficulty of system, loss and conducted interference are big, and the single-machine capacity of such system configuration is difficult to accomplish more than the MW level.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point, a kind of modularized parallel combination type high-power photovoltaic synchronization contravariant device, its control system and control method are provided, for design, manufacturing and the control that realizes high performance high-power photovoltaic synchronization inversion system provides solution, its modular parallel combination structure and control method thereof, can conveniently increase power system capacity, improve reliability and efficient, and improve the quality of grid-connected current.
Technical solution problem of the present invention adopts following technical scheme:
The design feature that the present invention makes up high-power photovoltaic synchronization contravariant device is:
Setting has the first inversion unit module (INV1) and other each inversion unit module (INV2～INVn) parallel with one another of identical inner structure, all inversion unit modules (common DC bus (SP, SN) of INV1, INV2～INVn), described all inversion unit modules are (after the ac output end of INV1, INV2～INVn) is parallel with one another, or directly insert electrical network, or be connected on the electrical network ac bus (U, V, W) through output transformer;
Each inversion unit module of described parallel connection (INV1, INV2～INVn) adopt the three-phase inversion structure, the inversion outlet side is parallel with one another behind three pole reactor L1, L2 and L3.
The design feature that the present invention makes up high-power photovoltaic synchronization contravariant device is that also described three-phase inversion structure is the three-phase voltage type inverter bridge.
The design feature of modular parallel combination high-power photovoltaic synchronization contravariant device control system of the present invention is that (INV1, INV2～INVn) having independently, cell controller, cell driving circuit, unit detect and communication function described each inversion unit module, the system master system device of setting is by optical fiber each inversion unit module to be sent control command to realize grid-connected Parallel Control, and can obtain the status data of each inversion unit module in real time.
The design feature of modular parallel combination high-power photovoltaic synchronization contravariant device control system of the present invention is that also described cell controller adopts DSP, FPGA or single-chip microcomputer as main control chip, and it is governor circuit that described system master system device adopts DSP and FPGA.
The control method of modular parallel combination high-power photovoltaic synchronization contravariant device control system of the present invention, it is characterized in that described system master system device finishes the conversion of instruction with FPGA and issue, be sent to each inversion unit module (INV1, INV2～INVn) through optical fiber, (pwm signal of INV1, INV2～INVn) is synchronous, and (the PWM carrier wave of INV2～INVn) has a carrier phase angle θ with respect to the PWM carrier wave of the first inversion unit module (INV1) to other each inversion unit module for described each inversion unit module; For the high-power grid-connected system with n parallel inverter unit module, wherein the carrier phase angle θ of i inversion unit module obtains according to following formula:
θ＝(2πi)/(nk)
Wherein, the unit of θ is the electrical degree of modulated sinusoid, and n is the number of parallel inverter unit module, 1≤n; K is a carrier wave ratio; The scope of i is 0≤i＜n.
The control method of modular parallel combination high-power photovoltaic synchronization contravariant device control system of the present invention, it is characterized in that described each inversion unit module m (fix with the phase place of carrier wave, and (modulated sinusoid of the individual inversion unit inside modules of 2≤j≤n) and carrier wave are with respect to modulated sinusoid and angle θ of carrier wave while phase shift of the first inversion unit module I NV1 inside for j by the inner modulated sinusoid of 1≤m≤n)
s,
θ
s＝(2πi)/(nk)
Wherein, θ
sUnit be the electrical degree of modulated sinusoid, n is the number of parallel inverter unit module, 1≤n; K is a carrier wave ratio; The scope of i is 0≤i＜n.
Each inversion unit has identical modulating wave in the system of the present invention, and the carrier phase proper angle, because every total mutually output current of grid-connected system equals the electric current sum of a plurality of parallel inverters unit of corresponding output phase, carrier phase makes the also phase shift certain angle of output current pulsation ripple of each inversion unit, each cell current ripple is cancelled each other when synthetic, thereby has significantly reduced the current ripples content after synthesizing.This method is compared with traditional scheme, under same carrier frequency, same filter inductance condition, can significantly reduce current ripples, and the total capacity of device do not increase, and is good, safe than the direct parallel current-sharing of power model.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention is applicable to the high-power grid-connecting apparatus that inversion unit is parallel extended, inversion unit adopts the control of phase-shifting carrier wave switch, make the fundametal compoment of output current in parallel equal the fundametal compoment sum of unit output current, and the harmonic component of unit in parallel output current is cancelled out each other, thereby reduces the percent harmonic distortion of output current in parallel.Compare with the system of direct use high-power switch device, even under identical modulating frequency, output current harmonics aberration rate of the present invention also has significantly reduction.
2, the equivalent switching frequency height of system of the present invention, the circuit structure of each unit is consistent with the live load of device, the output inductor simplicity of design, thereby reduced system cost, improved the reliability of system.
3, the present invention adopts optical fiber to realize that the control of each inversion unit module and main control unit gets in touch, and antijamming capability is strong, and system's control structure is simple, and each inversion unit structure is identical, has interchangeability, makes things convenient for installation, maintenance and dilatation.
Description of drawings
Fig. 1 is each inversion unit module main circuit schematic diagram of system of the present invention.
Fig. 2 is an inversion unit module subsystem controls structure chart of the present invention.
Fig. 3 is each inversion unit module of the present invention combination in parallel main circuit system structure chart.
Fig. 4 is the optical fiber control structure figure of system master unit.
Fig. 5 is system's power control principle block diagram that is incorporated into the power networks.
Below by embodiment, the invention will be further described in conjunction with the accompanying drawings.
Embodiment
Fig. 1, shown in Figure 3; port SP and SN are the input port of dc bus; U1, V1, W1 are the three-phase output end mouth of inversion unit module; CT11, CT12, CT13 are inversion unit output current transducer; can detect output current, realize the overcurrent protection of inversion unit module, C1 is a dc filter capacitor; L1, L2, L3 are the three-phase filter inductance, and T1～T6 is the power model IGBT in the inversion unit module.
Shown in Figure 2, in the present embodiment, the main control chip of cell controller adopts DSP or FPGA or single-chip microcomputer, built-in fiber communication interface and state detection circuit, optical communication interface contains two optical fiber, be respectively applied for signal transmission and signal and receive, cell controller is to link by optical fiber and system master system device.DSP receives master control PWM instruction, sends out pwm signal through the decoding computing and gives drive circuit, drives inverter main circuit IGBT; the corresponding PWM waveform of final output; DSP also gathers simultaneously state variables such as the output current of main circuit and busbar voltage, uploads main control unit by optical fiber, and self-protection.
Figure 3 shows that the line schematic diagram of each inversion unit module of system, the main circuit of grid-connecting apparatus adopts a plurality of inversion unit parallel connections, and each inversion unit adopts identical topological structure; Direct and the solar cell array of the DC side of parallel inverter unit, each inversion unit common DC bus, the ac output end parallel connection of each inversion unit, and connect output transformer through C1, C2, C3 capacitor filtering, be connected on the electrical network after output transformer boosts, each inversion unit in parallel is the three-phase inversion structure, and the inversion outlet side is in parallel behind three pole reactor L.It is identical to exchange outlet side filter inductance value, and the filter inductance output of corresponding phase is connected to each other and forms ac bus together.
Figure 4 shows that the optical fiber control structure figure of system master unit.The main control unit controller of system contains DSP and FPGA, its s operation control instruction sends to the inversion unit module through many group optical fiber respectively, and every group of fiber count is 2, and each inversion unit module can be exchanged, need not to be provided with corresponding parameter, make things convenient for installation, maintenance and the debugging of system.Main control unit can be realized the PWM control of each inversion unit module and data monitoring demonstration etc. by these optical fiber.
The control method of the system in the present embodiment can be that system master system device is finished the conversion of instruction with FPGA and issued, be sent to each inversion unit module I NV1, INV2～INVn through optical fiber, the pwm signal of each inversion unit module I NV1, INV2～INVn is synchronous, and the PWM carrier wave of other each inversion unit module I NV2～INVn has a carrier phase angle θ with respect to the PWM carrier wave of the first inversion unit module I NV1; For the high-power grid-connected system with n parallel inverter unit module, wherein the carrier phase angle θ of i inversion unit module obtains according to following formula:
θ＝(2πi)/(nk)
Wherein, the unit of θ is the electrical degree of modulated sinusoid, and n is the number of parallel inverter unit module, 1≤n; K is a carrier wave ratio; The scope of i is 0≤i＜n.
The control method of the system in the present embodiment, also can be that each inversion unit module m (fix with the phase place of carrier wave, and (modulated sinusoid of the individual inversion unit inside modules of 2≤j≤n) and carrier wave are with respect to modulated sinusoid and angle θ of carrier wave while phase shift of the first inversion unit module I NV1 inside for j by the inner modulated sinusoid of 1≤m≤n)
s,
θ
s＝(2πi)/(nk)
Wherein, θ
sUnit be the electrical degree of modulated sinusoid, n is the number of parallel inverter unit module, 1≤n; K is a carrier wave ratio; The scope of i is 0≤i＜n.
Fig. 5 is system's power control principle block diagram that is incorporated into the power networks.Its basic functional principle is as follows: MPPT is maximal power tracing control, it is according to the current watt level that is incorporated into the power networks, whether the operating voltage of identification array is in maximum power point voltage, and sends the skew instruction of bus operating voltage, is that the operating voltage of bus moves to maximum power point voltage.The output order voltage of MPPT module produces the power instruction P* that is incorporated into the power networks through the computing of Voltage Regulator Module and voltage detection module, detection calculations through power detection module and power conditioning module produces PWM pulse-width modulation instruction, obtain each road pwm signal through computing of PWM phase-shifting carrier wave and pwm pulse distributor circuit again, and send each inversion unit module.
The modulating wave of every group of inversion unit module is identical, and the output phase fundamental current of system equals the electric current sum of the corresponding output of a plurality of inversion units phase; The switch modulation of power device adopts the carrier phase control strategy, triangular carrier moves respective angles according to the phase shift rule, feasible pulsation ripple mutual deviation phase shift angle, thus make every phase current when synthetic, the current harmonics component is cancelled each other, and significantly reduces the ripple amplitude of output current.
Claims (6)
1, modular parallel combination high-power photovoltaic synchronization contravariant device is characterized in that:
Setting has the first inversion unit module (INV1) and other each inversion unit module (INV2～INVn) parallel with one another of identical inner structure, all inversion unit modules (common DC bus (SP, SN) of INV1, INV2～INVn), described all inversion unit modules are (after the ac output end of INV1, INV2～INVn) is parallel with one another, or directly insert electrical network, or be connected on the electrical network ac bus (U, V, W) through output transformer;
Each inversion unit module of described parallel connection (INV1, INV2～INVn) adopt the three-phase inversion structure, the inversion outlet side is parallel with one another behind three pole reactor L1, L2 and L3.
2, modular parallel combination high-power photovoltaic synchronization contravariant device according to claim 1 is characterized in that described three-phase inversion structure is the three-phase voltage type inverter bridge.
3, the control system of the described modular parallel combination of a kind of claim 1 high-power photovoltaic synchronization contravariant device, it is characterized in that (INV1, INV2～INVn) having independently, cell controller, cell driving circuit, unit detect and communication function described each inversion unit module, the system master system device of setting is by optical fiber each inversion unit module to be sent control command to realize grid-connected Parallel Control, and can obtain the status data of each inversion unit module in real time.
4, modular parallel combination high-power photovoltaic synchronization contravariant device control system according to claim 3, it is characterized in that described cell controller adopts DSP, FPGA or single-chip microcomputer as main control chip, it is governor circuit that described system master system device adopts DSP and FPGA.
5, the control method of the described modular parallel combination of a kind of claim 4 high-power photovoltaic synchronization contravariant device control system is characterized in that:
Described system master system device is finished the conversion of instruction with FPGA and is issued, be sent to each inversion unit module (INV1, INV2～INVn) through optical fiber, (pwm signal of INV1, INV2～INVn) is synchronous, and (the PWM carrier wave of INV2～INVn) has a carrier phase angle θ with respect to the PWM carrier wave of the first inversion unit module (INV1) to other each inversion unit module for described each inversion unit module; For the high-power grid-connected system with n parallel inverter unit module, wherein the carrier phase angle θ of i inversion unit module obtains according to following formula:
θ＝(2πi)/(nk)
Wherein, the unit of θ is the electrical degree of modulated sinusoid, and n is the number of parallel inverter unit module, 1≤n; K is a carrier wave ratio; The scope of i is 0≤i＜n.
6, the control method of the described modular parallel combination of a kind of claim 4 high-power photovoltaic synchronization contravariant device control system is characterized in that:
Each inversion unit module m (fix with the phase place of carrier wave, and (modulated sinusoid of the individual inversion unit inside modules of 2≤j≤n) and carrier wave are with respect to modulated sinusoid and angle θ of carrier wave while phase shift of the first inversion unit module I NV1 inside for j by the inner modulated sinusoid of 1≤m≤n)
s,
θ
s＝(2πi)/(nk)
Wherein, θ
sUnit be the electrical degree of modulated sinusoid, n is the number of parallel inverter unit module, 1≤n; K is a carrier wave ratio; The scope of i is 0≤i＜n.
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| CN102142689A (en) * | 2010-11-30 | 2011-08-03 | 浙江工业大学 | Blade type inversion server suitable for microgrid |
| CN102158062A (en) * | 2011-05-20 | 2011-08-17 | 北京国电四维清洁能源技术有限公司 | Photovoltaic grid-connected inverter |
| CN102497116A (en) * | 2011-12-24 | 2012-06-13 | 朱建国 | Photovoltaic grid-connected inverter |
| CN102820802A (en) * | 2012-08-17 | 2012-12-12 | 深圳市英威腾电气股份有限公司 | Inverter power supply system and signal transmission method thereof |
| CN103023060A (en) * | 2012-09-14 | 2013-04-03 | 深圳市汇川技术股份有限公司 | Photovoltaic inverter and harmonic suppression method |
| CN103219742A (en) * | 2013-03-19 | 2013-07-24 | 深圳市汇川技术股份有限公司 | Three-phase grid-connected inverter and three-phase electric reactor |
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| CN104660088A (en) * | 2015-03-04 | 2015-05-27 | 王曙光 | Variable-frequency inverter system for photovoltaic power generation |
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| CN102142689B (en) * | 2010-11-30 | 2013-04-17 | 浙江工业大学 | Blade type inversion server suitable for microgrid |
| CN102158062A (en) * | 2011-05-20 | 2011-08-17 | 北京国电四维清洁能源技术有限公司 | Photovoltaic grid-connected inverter |
| CN102497116A (en) * | 2011-12-24 | 2012-06-13 | 朱建国 | Photovoltaic grid-connected inverter |
| CN102820802A (en) * | 2012-08-17 | 2012-12-12 | 深圳市英威腾电气股份有限公司 | Inverter power supply system and signal transmission method thereof |
| CN102820802B (en) * | 2012-08-17 | 2015-10-28 | 深圳市英威腾电气股份有限公司 | Inverter system and signal transfer method thereof |
| CN103023060A (en) * | 2012-09-14 | 2013-04-03 | 深圳市汇川技术股份有限公司 | Photovoltaic inverter and harmonic suppression method |
| CN103219742B (en) * | 2013-03-19 | 2015-08-12 | 深圳市汇川技术股份有限公司 | Three-phase grid-connected inverter |
| CN103219742A (en) * | 2013-03-19 | 2013-07-24 | 深圳市汇川技术股份有限公司 | Three-phase grid-connected inverter and three-phase electric reactor |
| CN103944193A (en) * | 2014-04-22 | 2014-07-23 | 深圳市金宏威技术股份有限公司 | Parallel control system and method of modularized photovoltaic grid-connected inverter |
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| CN104505858A (en) * | 2014-12-26 | 2015-04-08 | 杭州禾迈电力电子技术有限公司 | Modularized grid-connected inverter and double-voltage-loop control method thereof |
| CN104660088A (en) * | 2015-03-04 | 2015-05-27 | 王曙光 | Variable-frequency inverter system for photovoltaic power generation |
| CN106253694A (en) * | 2015-06-03 | 2016-12-21 | 新能动力（北京）电气科技有限公司 | A kind of modular electric energy converting means |
| CN104950765A (en) * | 2015-06-23 | 2015-09-30 | 合肥工业大学 | Inverter parallel system based on CAN (controller area network) bus and carrier synchronization method of inverter parallel system |
| CN104950765B (en) * | 2015-06-23 | 2017-09-22 | 合肥工业大学 | A kind of inverter parallel system and its carrier synchronization method based on CAN |
| CN109964394A (en) * | 2016-11-18 | 2019-07-02 | 阿洛斯电子公司 | DC bus ripple for polyphase machine is eliminated |
| CN109964394B (en) * | 2016-11-18 | 2021-07-20 | 阿洛斯电子公司 | DC bus ripple cancellation for multi-phase electric machines |
| CN111342692A (en) * | 2019-12-24 | 2020-06-26 | 兰州飞行控制有限责任公司 | Low-power three-phase inverter power circuit |
| CN111342692B (en) * | 2019-12-24 | 2023-09-22 | 兰州飞行控制有限责任公司 | Low-power three-phase inverter circuit |
| CN116827155A (en) * | 2023-06-28 | 2023-09-29 | 荣信汇科电气股份有限公司 | Control system of cascade multi-level converter and carrier synchronization method thereof |
| CN116827155B (en) * | 2023-06-28 | 2024-02-20 | 荣信汇科电气股份有限公司 | Control system of cascade multi-level converter and carrier synchronization method thereof |
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