CN102832635B - Wind power generation networking control system based on direct driving modulation multi-level converter - Google Patents
Wind power generation networking control system based on direct driving modulation multi-level converter Download PDFInfo
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Abstract
The invention discloses a wind power generation networking control system based on a direct driving modulation multi-level converter. The system comprises a direct driving modulation multi-level converter, an A/D (Analog-to-Digital) sampling module and a main control module, wherein one side of the direct driving modulation multi-level converter is connected with a power grid; the other side of the direct driving modulation multi-level converter is connected with the low frequency power transmission line of the wind power generation set after the of a wind power generation set is processed by a boost transformer for carrying out variable speed constant frequency control and power control; the system further comprises a 9*n cascading unit module matrix; the A/D sampling module is connected with the direct driving modulation multi-level converter and is used for acquiring electric parameters of the unit modules; and the main control module is respectively connected with the direct driving modulation multi-level converter and the A/D sampling module and is used for providing a switch action signal of each unit module according to the electric parameters of the A/D sampling module. The system has the advantages that the installation and maintenance are convenient, no filtering equipment is needed, the impact on a power grid is small and convenient to expand, and the requirements on the development of a large-scale wind power generation set are met.
Description
Technical field
The present invention relates to power technology field, relate in particular to a kind of without install additional filter apparatus, to electrical network impact little and be convenient to expand the wind power-generating grid-connected control system based on direct driving module multi-level converter.
Background technology
Along with the development of global economy, the development and utilization of new forms of energy is subject to paying attention to more and more widely.Wind energy, as a kind of regenerative resource of clean green, its market also develops rapidly.Therefore, wind power-generating grid-connected control system has very high Practical significance.The access technology that is widely used in now wind power-generating grid-connected system mainly contains the access of constant-speed and constant-frequency unit and the access of variable speed constant frequency unit.The outlet frequency of wind turbine generator is generally between 12～18HZ, and along with the rising of wind-driven generator pool-size, low-speed generator cannot meet the requirement of grid-connected control, and then need the frequency of generating set be increased near power frequency with step-up gear.This has not only increased the difficulty of design, also brings great inconvenience to installation and maintenance, and the efficiency of unit is also undesirable simultaneously.
In addition, consider the particularity of China's wind energy turbine set resource distribution, our wind energy resources mainly concentrates on Xinjiang, two corridors, river, Inner Mongol and coastal area, and power consumption mainly concentrates on east China, middle part and southern areas, the transmission line of the long distance of large capacity requires also to increase.And the impact that wind turbine generator causes at Parallel Operation on Power System is also increasing.Wherein, blower fan output voltage being transformed to the access grid-connected converter of power frequency is the key equipment of wind power-generating grid-connected control system.At present, converter mainly adopts the topological structure of AC-DC-AC, and this kind of complex structure, has DC link, and efficiency is lower.So addressing the above problem to ensure wind power-generating grid-connected economy, moving is reliably the task of top priority.
Chinese Patent Application No. is that 200810220070.2 patent of invention discloses a kind of brushless dual-feedback wind power generator control system based on matrix converter, this system adopts 3 × 3 bidirectional switch matrix converters, one side connects the control winding of brushless double feed generator group, opposite side access electrical network.According to the rotor speed of brushless double feed generator, carry out AC-AC frequency conversion, the output electric energy frequency that realizes power winding is constant, i.e. variable speed constant frequency.But owing to adopting matrix converter, its output harmonic wave is larger, need install filter apparatus additional in grid side.And due to the special topological structure of matrix converter, its output-voltage levels is few, output current is discontinuous, can cause certain impact to electrical network.In addition, this system only relates to the grid-connected control of single wind-driven generator, and just current development situation, large-scale wind turbine generator be trend institute extremely, if adopt this system applies to need the matrix converter identical with wind-driven generator quantity in large-scale wind turbine generator, this will certainly cause the great number of issues such as economy, occupation of land, maintenance, and therefore, this system can not meet the growth requirement of large-scale wind generating set.
Summary of the invention
The object of the present invention is to provide a kind of wind power-generating grid-connected control system based on direct driving module multi-level converter, large to solve installation and maintenance inconvenience and output harmonic wave that existing wind power-generating grid-connected control system exists, need install filter apparatus additional; Output current is discontinuous, impacts electrical network and can not meet the technical problem of large-scale wind generating set growth requirement.
For achieving the above object, the invention provides a kind of wind power-generating grid-connected control system based on direct driving module multi-level converter, be connected with electrical network and wind turbine generator respectively, comprising: direct driving module multi-level converter, A/D sampling module and main control module, wherein
Direct driving module multi-level converter one side is connected with electrical network, low frequency power transmission circuit after step-up transformer is connected opposite side with wind turbine generator, in order to carry out variable speed constant frequency control and power control, realize the grid-connected of safe and reliable economy, it further comprises 9 × n cascade unit module matrix;
A/D sampling module is connected with direct driving module multi-level converter, in order to gather the electrical parameter of each unit module;
Main control module is connected with direct driving module multi-level converter and A/D sampling module respectively, in order to the electric parameter gathering according to A/D sampling module, provides the switch actuating signals of each unit module.
According to the wind power-generating grid-connected control system based on direct driving module multi-level converter described in preferred embodiment of the present invention, its 9 × n cascade unit module matrix comprises 9 brachium pontis, each brachium pontis is formed by a buffering reactor and N unit module cascade, and cascade brachium pontis is 3 × 3 arrays, the three-phase input end of one side of array is connected with electrical network, and the low frequency power transmission circuit after low frequency step-up transformer is connected the three-phase output end of opposite side with wind turbine generator.
According to the wind power-generating grid-connected control system based on direct driving module multi-level converter described in preferred embodiment of the present invention, above-mentioned unit module further comprises: H bridge unit, sub-A/D sampling module and sub-control module, wherein,
H bridge unit is the single-phase inverter being built by four IGBT switches and electrochemical capacitor;
Sub-A/D sampling module is connected with H bridge unit, in order to gather capacitance voltage;
Sub-control module is connected with H bridge unit and sub-A/D sampling module respectively, in order to carry out communication with main control module, and transmission voltage information, reception control signal, drives 4 IGBT switches.
According to the wind power-generating grid-connected control system based on direct driving module multi-level converter described in preferred embodiment of the present invention, its main control module adopts the capacitance voltage balance method output waveform modulation of staircase waveform modulation and sequencing selection.
According to the wind power-generating grid-connected control system based on direct driving module multi-level converter described in preferred embodiment of the present invention, cascade unit module matrix is equivalent to current source matrix by its main control module, and then carry out current closed-loop control.
With respect to prior art, the present invention has the following advantages:
1, this system does not need the frequency of wind turbine generator to rise near power frequency, can save the step-up gear of unit shaft tower top, not only reduces costs, and can also improve system reliability of operation.
2, this system adopts low frequency power transmission can reach longer distance compared with power frequency transmission of electricity, and loss is low.
3, this system can regulate the lower frequency side frequency of direct driving module multi-level converter in real time, to improve the overall operation efficiency of wind turbine generator.
4, this system can, according to system load flow situation control lower frequency side voltage, regulate lower frequency side reactive power flow, meets the requirement of system power quality and idle configuration.
5, this system adopts modularized design, is convenient to expand according to different power system capacities, can meet the growth requirement of large-scale wind generating set.Meanwhile, it is more convenient that Redundancy Design makes maintenance;
6, compared to two traditional level and 3 flat outputs, this system adopts many level output, and its harmonic content greatly reduces, and output current is continuous, therefore need not install extra filter apparatus additional in grid-connected side, impacts less to electrical network simultaneously.
Brief description of the drawings
Fig. 1 is the overall structure schematic diagram that the present invention is based on the wind power-generating grid-connected control system of direct driving module multi-level converter;
Fig. 2 is the structural representation of the unit module of the direct driving module multi-level converter of the embodiment of the present invention;
Fig. 3 is the control principle drawing of the direct driving module multi-level converter of the embodiment of the present invention;
Fig. 4 is the equivalent circuit diagram of the direct driving module multi-level converter of the embodiment of the present invention.
Embodiment
Explain in detail below in conjunction with accompanying drawing wind power-generating grid-connected control system structure and the principle based on direct driving module multi-level converter that patent of the present invention provides.
Refer to Fig. 1, a kind of wind power-generating grid-connected control system based on direct driving module multi-level converter, comprising: direct driving module multi-level converter 10, A/D sampling module 20 and main control module 30.Direct driving module multi-level converter 10 1 sides are connected with electrical network 40, low frequency power transmission circuit after step-up transformer is connected opposite side with wind turbine generator 50, in order to carry out variable speed constant frequency control and power control, realize the grid-connected of safe and reliable economy, it comprises 9 × n cascade unit module matrix, and 9 × n cascade unit module matrix comprises 9 brachium pontis, each brachium pontis is formed by a buffering reactor and N unit module cascade, as shown in the figure, cascade brachium pontis is 3 × 3 arrays, the three-phase input end of one side of array is connected with electrical network 40, low frequency power transmission circuit after low frequency step-up transformer is connected the three-phase output end of opposite side with wind turbine generator 50.A/D sampling module 20 is connected with direct driving module multi-level converter 10, in order to gather the electrical parameter of each unit module; Main control module 30 is connected with direct driving module multi-level converter 10 and A/D sampling module 20 respectively, in order to the electric parameter gathering according to A/D sampling module 20, provides the switch actuating signals of each unit module.
Referring again to Fig. 2, unit module comprises H bridge list 60, sub-control module 70 and sub-A/D sampling module 80.H bridge unit 60 comprises 4 IGBT switches and 1 electrochemical capacitor, connects as shown in the figure, and 4 IGBT switches and 1 electrochemical capacitor are built into a unidirectional inverter.Sub-A/D sampling module 70 is connected with H bridge unit 60, in order to gather capacitance voltage.Sub-control module 80 is connected with H bridge unit 60 and sub-A/D sampling module 70 respectively, in order to carry out communication with main control module 30, and transmission voltage information, reception control signal, drives 4 IGBT switches.
Main control module of the present invention adopts the capacitance voltage balance method output waveform modulation of staircase waveform modulation and sequencing selection, and cascade unit module matrix is equivalent to current source matrix, to carry out current closed-loop control.Refer to Fig. 3, control algolithm part is taking the TMS320F2812 high-speed digital signal process chip of the C2000 of TI company series as core, its function is that the each electrical parameter detecting according to A/D sampling module part calculates direct driving module multi-level converter Ge road modulation signal, carries out grid-connected and power control.External clock is the crystal oscillator of 30MHZ, provides clock signal to dsp chip.
Because dsp chip PWM port is less, far can not meet the requirement that drives the switch in all cascade module, and I/O mouth is limited, cannot connect all unit modules, therefore must extra chips carry out pulse distribution and signals collecting.The XC3S400AN chip of choosing the Spartan-3AN of Xilinx company series completes miscellaneous function.Utilize 9 XC3S400AN chips, nine brachium pontis of corresponding direct driving module multi-level converter respectively.Its function is the modulation signal of DSP, carries out staircase waveform modulation, and carries out balance of voltage control according to the each capacitance voltage value of this brachium pontis; Simultaneously with this brachium pontis in all sub-control module communication, accept sample information, transmission of control signals.
Cascade unit module matrix is equivalent to current source matrix by the present invention, and then carry out current closed-loop control.Please refer to Fig. 4, each bridge arm equivalent of direct driving module multi-level converter is become to current source.Grid side three-phase current is respectively I
a1, I
b1, I
c1, wind turbine generator side three-phase current is respectively I
a2, I
b2, I
c3.
If three-phase complete equipilibrium, the instruction current signal of each equivalent current source is as follows:
Consider the balance of capacitance voltage, the active power balance of electrical network and wind turbine generator:
The amplitude of three-phase direct-axis current is:
In like manner the amplitude of three concurrent aces electric currents is:
According to quadrature axis current amplitude and direct-axis current amplitude, can calculate grid side and wind turbine generator side three-phase alternating current amplitude:
Also can obtain the phase difference of three-phase alternating current and voltage:
Composite type (5) can be obtained converter both sides alternating current command value with formula (6):
And can obtain the alternating current command signal of 9 brachium pontis of direct driving module multi-level converter according to formula (1), and modulate and the control of capacitance voltage balance by staircase waveform, just can realize grid-connected control and power control.
With respect to prior art, the present invention has the following advantages:
1, this system does not need the frequency of wind turbine generator to rise near power frequency, can save the step-up gear of unit shaft tower top, not only reduces costs, and can also improve system reliability of operation.
2, this system adopts low frequency power transmission can reach longer distance compared with power frequency transmission of electricity, and loss is low.
3, this system can regulate the lower frequency side frequency of direct driving module multi-level converter in real time, to improve the overall operation efficiency of wind turbine generator.
4, this system can, according to system load flow situation control lower frequency side voltage, regulate lower frequency side reactive power flow, meets the requirement of system power quality and idle configuration.
5, this system adopts modularized design, is convenient to expand according to different power system capacities, can meet the growth requirement of large-scale wind generating set.Meanwhile, it is more convenient that Redundancy Design makes maintenance;
6, compared to two traditional level and 3 flat outputs, this system adopts many level output, and its harmonic content greatly reduces, and output current is continuous, therefore need not install extra filter apparatus additional in grid-connected side, impacts less to electrical network simultaneously.
The above, it is only better embodiment of the present invention, not the present invention is done to any pro forma restriction, any content that does not depart from technical solution of the present invention, any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the scope of technical solution of the present invention.
Claims (3)
1. the wind power-generating grid-connected control system based on direct driving module multi-level converter, is connected with electrical network and wind turbine generator respectively, it is characterized in that, comprising: direct driving module multi-level converter, A/D sampling module and main control module, wherein,
Described direct driving module multi-level converter one side is connected with electrical network, low frequency power transmission circuit after step-up transformer is connected opposite side with wind turbine generator, in order to carry out variable speed constant frequency control and power control, realize the grid-connected of safe and reliable economy, it further comprises 9 × n cascade unit module matrix, described 9 × n cascade unit module matrix comprises 9 brachium pontis, each described brachium pontis is formed by a buffering reactor and N unit module cascade, and the brachium pontis of described cascade is 3 × 3 arrays, the three-phase input end of one side of described array is connected with electrical network, low frequency power transmission circuit after low frequency step-up transformer is connected the three-phase output end of opposite side with wind turbine generator, described unit module further comprises: H bridge unit, sub-A/D sampling module and sub-control module, wherein,
Described H bridge unit is the single-phase inverter being built by four IGBT switches and electrochemical capacitor;
Described sub-A/D sampling module is connected with described H bridge unit, in order to gather capacitance voltage;
Described sub-control module is connected with described H bridge unit and sub-A/D sampling module respectively, in order to carry out communication with described main control module, and transmission voltage information, reception control signal, drives described four IGBT switches;
Described A/D sampling module is connected with described direct driving module multi-level converter, in order to gather the electric parameter of described each unit module;
Described main control module is connected with described direct driving module multi-level converter and A/D sampling module respectively, in order to the electric parameter gathering according to described A/D sampling module, provides the switch actuating signals of each described unit module.
2. the wind power-generating grid-connected control system based on direct driving module multi-level converter as claimed in claim 1, is characterized in that: described main control module adopts the capacitance voltage balance method output waveform modulation of staircase waveform modulation and sequencing selection.
3. the wind power-generating grid-connected control system based on direct driving module multi-level converter as claimed in claim 2, is characterized in that: described cascade unit module matrix is equivalent to current source matrix by described main control module, and then carry out current closed-loop control.
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| CN109787239B (en) * | 2019-02-27 | 2020-11-10 | 西安交通大学 | Alternating iteration load flow calculation method and system of load flow model and multi-frequency alternating current series-parallel system |
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| CN101051793A (en) * | 2007-05-21 | 2007-10-10 | 哈尔滨九洲电气股份有限公司 | Megawatt direct driving type wind and electric joint-net current transformer |
| CN200976561Y (en) * | 2006-11-24 | 2007-11-14 | 华中科技大学 | Superconducting magnetic energy storage based variable constant frequency dual-fed wind power generator excitation frequency transformer |
| CN201039016Y (en) * | 2007-05-21 | 2008-03-19 | 哈尔滨九洲电气股份有限公司 | Mega W direct drive wind network merging convertor |
| CN101860231A (en) * | 2010-05-20 | 2010-10-13 | 新疆全新环保新技术科技有限公司 | Special tri-level full-power converter set for large power wind-driven generator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN200976561Y (en) * | 2006-11-24 | 2007-11-14 | 华中科技大学 | Superconducting magnetic energy storage based variable constant frequency dual-fed wind power generator excitation frequency transformer |
| CN101051793A (en) * | 2007-05-21 | 2007-10-10 | 哈尔滨九洲电气股份有限公司 | Megawatt direct driving type wind and electric joint-net current transformer |
| CN201039016Y (en) * | 2007-05-21 | 2008-03-19 | 哈尔滨九洲电气股份有限公司 | Mega W direct drive wind network merging convertor |
| CN101860231A (en) * | 2010-05-20 | 2010-10-13 | 新疆全新环保新技术科技有限公司 | Special tri-level full-power converter set for large power wind-driven generator |
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Effective date of registration: 20161226 Address after: 223001 science and Technology Industrial Park, Jiangsu, Huaian science and technology road, No. 18 Patentee after: North Jiangsu Institute of Shanghai Jiao Tong University Address before: 800 Dongchuan Road, Shanghai, No. 200240 Patentee before: Shanghai Jiaotong Univ. |