CN103576089B - A kind of high-low voltage based on series connection dynamic electric voltage recovery device passes through test system - Google Patents
A kind of high-low voltage based on series connection dynamic electric voltage recovery device passes through test system Download PDFInfo
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Abstract
The present invention relates to the test system of generation of electricity by new energy and generation of electricity by new energy field tests, be specifically related to a kind of high-low voltage based on series connection dynamic electric voltage recovery device and pass through test system.Use the structure that high-voltage generating device is connected with low voltage generating device, described system access is between Wind turbines and electrical network or between photovoltaic generating system and electrical network, there is voltage dip and the process of voltage swells in simulation, uses switching sequence that Wind turbines and photovoltaic generating system can carry out the hybrid test that independent high voltage crossing test, the test of independent low voltage crossing and high-low voltage are passed through；Switching sequence logic is simple, it is easy to accomplish.
Description
Technical field
The present invention relates to the test system of generation of electricity by new energy and generation of electricity by new energy field tests, be specifically related to a kind of high-low voltage based on series connection dynamic electric voltage recovery device and pass through test system.
Background technology
China in Recent Years wind-power electricity generation and photovoltaic generation installed capacity develop rapidly, and wind-powered electricity generation and the photoelectricity generating proportion in electrical network increases year by year, and large-scale wind power and the grid-connected safe and stable operation on power system of photoelectricity have resulted in very important impact.Since particularly 2010, repeatedly there is large-scale wind power unit off-grid accident in " three Norths " area, produces power network safety operation and has a strong impact on.In all previous large-scale wind-powered electricity generation off-grid accident, most because grid disturbance generation Voltage Drop, part of generating units because not possessing low voltage ride-through capability and off-grid, grid disturbance disappear after voltage swells, have again part of generating units because not possessing high voltage crossing ability and off-grid.
When low voltage crossing (LVRT) functional requirement electric network fault causes set end voltage to fall, Wind turbines and photovoltaic generating system can keep not off-grid to run continuously and active power and reactive current meet the requirement of wind-electricity integration directive/guide.It is 0.2-0.9 times of rated voltage that national standard requirement site obtain the degree of depth of Voltage Drop, and the corresponding time is 625ms-2000ms.Equally, high voltage crossing typically requires when grid-connected point voltage rises sharply to 1.1-1.3 times of rated voltage, and Wind turbines and photovoltaic DC-to-AC converter can keep not off-grid to run continuously within a certain period of time, until grid-connected point voltage recovers.
The low voltage ride-through capability of Wind turbines and photovoltaic generating system is more paid attention at present, and national standard is the most issued, and all kinds of policy documents are put into effect successively；Each complete machine producer, parts manufacturer and scientific research institution also take corresponding technical measures and solution；Low voltage crossing test equipment and scheme are the most ripe, and Patents has obtained mandate.But high voltage crossing the most not yet causes enough attention, correlational study is at the early-stage, is not the most specifically designed for equipment and scheme that high voltage crossing ability carries out testing.Along with the continuation of wind-power electricity generation and photovoltaic generation installed capacity expands, possessing high voltage crossing ability will become the inevitable requirement to Wind turbines and photovoltaic generating system.Australia takes the lead in having formulated the high voltage crossing directive/guide of grid connected wind power unit, when high-pressure side line voltage rise sharply to rated voltage 130% time, Wind turbines should maintain 60ms not off-grid to run continuously, and sufficiently large fault recovery electric current is provided, it is clear that high voltage crossing ability is proposed requirement.
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of high-low voltage based on series connection dynamic electric voltage recovery device and pass through test system, the Voltage Drop after practical power systems fault and the voltage swells phenomenon after fault clearance can be simulated, Wind turbines/photovoltaic generating system low voltage crossing LVRT and high voltage crossing HVRT ability can be tested.
It is an object of the invention to use following technical proposals to realize:
The present invention provides a kind of high-low voltage based on series connection dynamic electric voltage recovery device to pass through test system, it thes improvement is that, described system uses the structure that high-voltage generating device is connected with low voltage generating device, described system access is between Wind turbines and electrical network or between photovoltaic generating system and electrical network, there is voltage dip and the process of voltage swells in simulation, uses switching sequence that Wind turbines and photovoltaic generating system carry out the hybrid test that independent high voltage crossing test, the test of independent low voltage crossing and high-low voltage are passed through；
Series boosting transformator between described system and Wind turbines or between described system and photovoltaic generating system.
Preferably, described high-voltage generating device uses dynamic electric voltage recovery device to realize, including by-pass switch S3, inverter, LC low pass filter and series transformer, described by-pass switch S3 is connected in parallel on series transformer two ends, and the described capacitor of LC low pass filter is connected with the secondary of series transformer；The inductance of described LC low pass filter is connected with inverter.
More preferably, following three controlling unit is included when dynamic electric voltage recovery device is controlled:
Link 1: deducted the measured value of the booster transformer high side voltage of Wind turbines or photovoltaic generating system by voltage instruction, through the pi regulator PI of band amplitude limitvIt is adjusted, as outer voltage controlling unit；Pi regulator PI with amplitude limitvOutput as the instruction of internal ring LC low-pass filter capacitance electric current；
Link 2: by the pi regulator PI of band amplitude limitvOutput as internal ring instruct, deduct the current measurement value of LC low-pass filter capacitance, through the pi regulator PI of band amplitude limitIIt is adjusted, as current inner loop controlling unit；
Link 3: the pi regulator PI of band amplitude limitIOutput deduct voltage feed-forward control, the output electric current deducting Wind turbines or photovoltaic generating system again is folded to the on high-tension side current measurement value of booster transformer, as the output of inverter control system, after the power amplification effect of inverter, the voltage as inverter exports.
Preferably, described low voltage generating device uses impedance divided voltage sag generator to realize, including by-pass switch S1, short switch S2, current-limiting reactor and short-circuit reactance device；By short switch-short-circuit reactance device series arm ground connection after described by-pass switch S1 is in parallel with current-limiting reactor, short switch-short-circuit reactance device series arm is composed in series by short switch S2 and short-circuit reactance device.
Preferably, application switch sequencing contro during the hybrid test that described system carries out independent high voltage crossing test, independent low voltage crossing is tested and high-low voltage is passed through.
More preferably, described system carries out applying following switching sequence during the test of independent high voltage crossing:
Keeping by-pass switch S1 Guan Bi, short switch S2 opens；During voltage swells, by-pass switch S3 opens, and sends reactive current by inverter and promotes grid-connected point voltage；When voltage recovers, by-pass switch S3 closes.
More preferably, described system carries out applying following switching sequence during the test of independent low voltage crossing:
Keep by-pass switch S3 Guan Bi；During Voltage Drop, by-pass switch S1 opens, short switch S2 Guan Bi after 5 seconds；When voltage recovers, short switch S2 recovers to open, and after 10 seconds, by-pass switch S1 recovers Guan Bi.
More preferably, described system carries out applying when high-low voltage passes through hybrid test following switching sequence:
By-pass switch S3 opens, and after 5 seconds, by-pass switch S1 opens, and short switch S2 Guan Bi after 5 seconds, voltage starts to fall；When voltage recovers, short switch S2 recovers to open, and inverter sends reactive current and promotes grid-connected point voltage；After 10 seconds, by-pass switch S1 and by-pass switch S3 is respectively closed.
More preferably, what S3 of described by-pass switch S1 is normally closed switch；Described short switch S2 is normal open switch.
Compared with the prior art, the present invention reaches to provide the benefit that:
(1) due to the fact that employing low voltage generating device and high-voltage generating device are composed in series, can realize individually occurring voltage dip flexibly, individually voltage swells occur, and first occur voltage dip that the mixed process of voltage swells occurs again, it is adaptable to the test of the various operating modes of low voltage crossing and high voltage crossing ability；
(2) low voltage generating device of the present invention is made up of impedance and switch, and the process of Voltage Drop and recovery is the quickest, can the process of accurate simulation short circuit malfunction；
(3) high-voltage generating device of the present invention is made up of dynamic electric voltage recovery device of connecting (DVR) and switch, response speed is very fast, truly can the most immediately exit the phenomenon of the voltage swells caused due to the reactive power compensator of wind energy turbine set/photovoltaic plant after simulating grid fault recovery；
(4) position between test device and electrical network and the Wind turbines that the present invention proposes is relatively fixed, after once having connected, it is not necessary to changes the mode of connection and just can complete the test of all high-low voltage operating modes.
(5) present invention is the improvement on the basis of original low voltage crossing test device, only need to increase high voltage and part occurs and revises switching logic, simply be easily achieved.
Accompanying drawing explanation
Fig. 1 is the hardware structure diagram of the test system that the present invention provides；
Fig. 2 is the one phase equivalent circuit figure of the test system that the present invention provides；
Fig. 3 is the control principle drawing of the dynamic electric voltage recovery device that the present invention provides；
Fig. 4 is the switching sequence figure individually testing low voltage ride-through capability that the present invention provides；
Fig. 5 is the switching sequence figure of the high voltage crossing ability of individually testing that the present invention provides；
Fig. 6 is the hybrid test low-voltage that provides of the present invention and the switching sequence figure of high voltage crossing ability；
Fig. 7 is the voltage simulation waveform figure individually testing low voltage ride-through capability that the present invention provides；
Fig. 8 is the voltage simulation waveform figure of the high voltage crossing ability of individually testing that the present invention provides；
Fig. 9 is the hybrid test low-voltage that provides of the present invention and the voltage simulation waveform figure of high voltage crossing ability.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail.
The present invention provides a kind of high-low voltage based on series connection dynamic electric voltage recovery device to pass through test system, use dynamic electric voltage to recover (DVR) device to connect with impedance divided voltage sag generator, it is linked into tested Wind turbines/between photovoltaic generating system and electrical network, there is voltage dip and the process risen sharply in simulation, for Wind turbines/photovoltaic generating system carries out low voltage crossing and high voltage crossing integrated testing.The one phase equivalent circuit figure of the hardware structure diagram of test system and test system the most as illustrated in fig. 1 and 2, is made up of low voltage generating device and high-voltage generating device two parts, and when producing test respectively, required voltage drops and voltage swells process temporarily.
High-voltage generating device uses dynamic electric voltage recovery device to realize, including by-pass switch S3, inverter, LC low pass filter and series transformer, described by-pass switch S3 is connected in parallel on series transformer two ends, and the described capacitor of LC low pass filter is connected with the secondary of series transformer；The inductance of described LC low pass filter is connected with inverter.The control principle drawing of dynamic electric voltage recovery device is as shown in Figure 3.Following three controlling unit is included when dynamic electric voltage recovery device is controlled:
Link 1: deducted the measured value of the booster transformer high side voltage of Wind turbines or photovoltaic generating system by voltage instruction, through the pi regulator PI of band amplitude limitvIt is adjusted, as outer voltage controlling unit；Pi regulator PI with amplitude limitvOutput as the instruction of internal ring LC low-pass filter capacitance electric current；
Link 2: by the pi regulator PI of band amplitude limitvOutput as internal ring instruct, deduct the current measurement value of LC low-pass filter capacitance, through the pi regulator PI of band amplitude limitIIt is adjusted, as current inner loop controlling unit；
Link 3: the pi regulator PI of band amplitude limitIOutput deduct voltage feed-forward control, the output electric current deducting Wind turbines or photovoltaic generating system again is folded to the on high-tension side current measurement value of booster transformer, as the output of inverter control system, after the power amplification effect of inverter, the voltage as inverter exports.
Low voltage generating device uses impedance divided voltage sag generator to realize, including by-pass switch S1, short switch S2, current-limiting reactor and short-circuit reactance device；By short switch-short-circuit reactance device series arm ground connection after described by-pass switch S1 is in parallel with current-limiting reactor, short switch-short-circuit reactance device series arm is composed in series by short switch S2 and short-circuit reactance device.
Testing scheme both can realize individually testing low voltage ride-through capability and individually testing high voltage crossing ability, it is possible to realizes low voltage ride-through capability and high voltage crossing ability hybrid test in once test.Application switch sequencing contro during test, specific as follows:
(1) test system carries out applying following switching sequence during the test of independent high voltage crossing:
Keeping by-pass switch S1 Guan Bi, short switch S2 opens；During voltage swells, by-pass switch S3 opens, and sends reactive current by inverter and promotes grid-connected point voltage；When voltage recovers, by-pass switch S3 closes.Its switching sequence figure is as shown in Figure 5.
(2) test system carries out applying following switching sequence during the test of independent low voltage crossing:
Keep by-pass switch S3 Guan Bi；During Voltage Drop, by-pass switch S1 opens, short switch S2 Guan Bi after 5 seconds；When voltage recovers, short switch S2 recovers to open, and after 10 seconds, by-pass switch S1 recovers Guan Bi.Its switching sequence figure is as shown in Figure 4.
(3) test system carries out applying when high-low voltage passes through hybrid test following switching sequence:
By-pass switch S3 opens, and after 5 seconds, by-pass switch S1 opens, and short switch S2 Guan Bi after 5 seconds, voltage starts to fall；When voltage recovers, short switch S2 recovers to open, and inverter sends reactive current and promotes grid-connected point voltage；After 10 seconds, by-pass switch S1 and by-pass switch S3 is respectively closed.Its switching sequence figure is as shown in Figure 6.
By-pass switch S1
It is normally closed switch with S3；Described short switch S2 is normal open switch.
Embodiment
Put forward high-low voltage based on series connection dynamic electric voltage recovery device according to the present invention and passed through test system, the process simulate the process that voltage dip individually occurs, voltage swells individually occurring, and first occur voltage dip that the mixed process of voltage swells occurs again.Grid-connected point voltage during these three test it is respectively shown in Fig. 7, Fig. 8, Fig. 9.As seen from the figure, this implementation can complete these three function.
The present invention uses low voltage generating device and high-voltage generating device tandem compound, access Wind turbines/between photovoltaic generating system and electrical network, the voltage dip occurred after simulation generation electric network fault and voltage swells phenomenon, carry out low voltage ride-through capability to tested Wind turbines/photovoltaic generating system and high voltage crossing ability tested；Complete function, it is achieved easy.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although the present invention being described in detail with reference to above-described embodiment, those of ordinary skill in the field are it is understood that still can modify or equivalent to the detailed description of the invention of the present invention, and without departing from any amendment of spirit and scope of the invention or equivalent, it all should be contained in the middle of scope of the presently claimed invention.
Claims (7)
1. a high-low voltage based on series connection dynamic electric voltage recovery device passes through test system, it is characterized in that, described system uses the structure that high-voltage generating device is connected with low voltage generating device, described system access is between Wind turbines and electrical network or between photovoltaic generating system and electrical network, there is voltage dip and the process of voltage swells in simulation, uses switching sequence that Wind turbines and photovoltaic generating system carry out the hybrid test that independent high voltage crossing test, the test of independent low voltage crossing and high-low voltage are passed through；
Series boosting transformator between described system and Wind turbines or between described system and photovoltaic generating system；
Described high-voltage generating device uses dynamic electric voltage recovery device to realize, including by-pass switch S3, inverter, LC low pass filter and series transformer, described by-pass switch S3 is connected in parallel on series transformer two ends, and the described capacitor of LC low pass filter is connected with the secondary of series transformer；The inductance of described LC low pass filter is connected with inverter；
Following three controlling unit is included when dynamic electric voltage recovery device is controlled:
Link 1: deducted the measured value of the booster transformer high side voltage of Wind turbines or photovoltaic generating system by voltage instruction, through the pi regulator PI of band amplitude limitvIt is adjusted, as outer voltage controlling unit；Pi regulator PI with amplitude limitvOutput as the instruction of internal ring LC low-pass filter capacitance electric current；
Link 2: by the pi regulator PI of band amplitude limitvOutput as internal ring instruct, deduct the current measurement value of LC low-pass filter capacitance, through the pi regulator PI of band amplitude limitIIt is adjusted, as current inner loop controlling unit；
Link 3: the pi regulator PI of band amplitude limitIOutput deduct voltage feed-forward control, the output electric current deducting Wind turbines or photovoltaic generating system again is folded to the on high-tension side current measurement value of booster transformer, as the output of inverter control system, after the power amplification effect of inverter, the voltage as inverter exports.
2. high-low voltage as claimed in claim 1 passes through test system, it is characterised in that described low voltage generating device uses impedance divided voltage sag generator to realize, including by-pass switch S1, short switch S2, current-limiting reactor and short-circuit reactance device；By short switch-short-circuit reactance device series arm ground connection after described by-pass switch S1 is in parallel with current-limiting reactor, short switch-short-circuit reactance device series arm is composed in series by short switch S2 and short-circuit reactance device.
3. high-low voltage as claimed in claim 1 passes through test system, it is characterised in that application switch sequencing contro during the hybrid test that described system carries out independent high voltage crossing test, independent low voltage crossing is tested and high-low voltage is passed through.
4. high-low voltage as claimed in claim 2 passes through test system, it is characterised in that described system carries out applying during the test of independent high voltage crossing following switching sequence:
Keeping by-pass switch S1 Guan Bi, short switch S2 opens；During voltage swells, by-pass switch S3 opens, and sends reactive current by inverter and promotes grid-connected point voltage；When voltage recovers, by-pass switch S3 closes.
5. high-low voltage as claimed in claim 2 passes through test system, it is characterised in that described system carries out applying during the test of independent low voltage crossing following switching sequence:
Keep by-pass switch S3 Guan Bi；During Voltage Drop, by-pass switch S1 opens, short switch S2 Guan Bi after 5 seconds；When voltage recovers, short switch S2 recovers to open, and after 10 seconds, by-pass switch S1 recovers Guan Bi.
6. high-low voltage as claimed in claim 2 passes through test system, it is characterised in that described system carries out applying when high-low voltage passes through hybrid test following switching sequence:
By-pass switch S3 opens, and after 5 seconds, by-pass switch S1 opens, and short switch S2 Guan Bi after 5 seconds, voltage starts to fall；When voltage recovers, short switch S2 recovers to open, and inverter sends reactive current and promotes grid-connected point voltage；After 10 seconds, by-pass switch S1 and by-pass switch S3 is respectively closed.
7. the high-low voltage as according to any one of claim 4-6 passes through test system, it is characterised in that described by-pass switch S1 and S3 is normally closed switch；Described short switch S2 is normal open switch.
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| CN104009695B (en) * | 2014-05-06 | 2016-09-07 | 合肥工业大学 | Double-fed wind power generator high pressure based on profile tracking passes through the control method of rotor |
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| CN107015078A (en) * | 2017-03-27 | 2017-08-04 | 国网山东省电力公司威海供电公司 | Wind power plant fault ride-through capacity calibration equipment |
| CN108152619B (en) * | 2017-12-16 | 2021-02-05 | 西安翌飞核能装备股份有限公司 | Power grid fault simulation device and control method thereof |
| CN109546686A (en) * | 2018-12-28 | 2019-03-29 | 长沙理工大学 | The voltage compensation and uninterrupted power supply method of dynamic electric voltage recovery device based on light hair long electric unit |
| CN110501639B (en) * | 2019-05-27 | 2022-05-03 | 常州赛英新能源科技有限公司 | Multi-index voltage disturbance generation device and method for grid connection detection of wind turbine generator |
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