CN106451401A - Control method of maximum power output of converter when DC voltage drops - Google Patents
Control method of maximum power output of converter when DC voltage drops Download PDFInfo
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- CN106451401A CN106451401A CN201610323666.XA CN201610323666A CN106451401A CN 106451401 A CN106451401 A CN 106451401A CN 201610323666 A CN201610323666 A CN 201610323666A CN 106451401 A CN106451401 A CN 106451401A
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- transverter
- reference value
- current
- voltage
- converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
Abstract
The present invention discloses a control method of the maximum power output of a converter when the DC voltage drops, which is for the converter station in the flexible DC power grid when the voltage drops sharply, and controls the converter to perform the maximum power output without overcurrent. The method utilizes parameters of the equivalent inductance and the total resistance of the AC side of the converter, and determines whether the converter current inner loop control has an alternating current reference value solution set with the allowable maximal current through the converter as a constraint condition according to current voltages of AC and DC sides of the converter. When the reference value exists, the present invention provides a reference value solving method. The AC current reference value obtained by the method is sent to the local control current inner loop of the converter to make the converter output the maximum power to the DC system, which is beneficial for DC voltage recovery.
Description
Technical field
The present invention relates to the control method of transverter maximum power output when a kind of DC voltage falls, to remain flexible straight
The transient stability of stream line voltage.
Background technology
It owing to flexible direct current net capacity is less, when the access of big load or dc-side short-circuit, is easily caused straight
Significantly falling of stream voltage.Further, since the randomness of the input/excision of load or distributed power source, and due to direct current net
The impedance of network is less, so each current conversion station of multiterminal distribution network systems contacts closely, too increases in flexible direct current electrical network and occurs
The probability of Voltage Drop.Therefore the control strategy being suitable for need not be used to maintain the stable tool of DC voltage during locking at transverter
Making great sense, the frequent locking of the current conversion station otherwise controlling DC voltage can by the power supply having a strong impact on flexible direct current electrical network
By property.
The local control action of transverter is to control, according to system, the power instruction providing, and in coordinating station, transverter voltage is adjusted
Value, and complete setting valve to the conversion triggering pulse, generally use the double-closed-loop control device based on VSC Direct Current Control, divide
For current inner loop and active power outer shroud.
When Voltage Drop, existing flexible direct current power grid control method generally uses the method for converter blocking
Reply (if there is direct-current short circuit fault, in addition it is also necessary to AC circuit breaker disconnects or transverter automatically cleared failure).But in actual feelings
In condition, unless there is transverter exit interpolar metallic short circuit, the possibility that DC voltage drops to 0 is very little.If
Use blocking method that system can be caused to lose the control to transverter power output.And with the development of dc circuit breaker, the change of current
Device must the situation of locking by fewer and feweri, such as during DC side line short, the current conversion station having installed dc circuit breaker additional is not necessarily to
The AC circuit breaker that locking or disconnection are connected.To keep transverter not locking in the case of Voltage Drop, need in this locality
Control considers stable state amplitude limit (restriction of DC voltage utilization rate) and the dynamic slice (restriction of IGBT heating) of transverter.
Content of the invention
It is an object of the invention to provide the control method of transverter maximum power output when a kind of DC voltage falls, with
Realizing when voltage significantly falls, control transverter carries out maximum power output under conditions of only flowing.The inventive method
Make use of transverter AC equivalent inductance and all-in resistance parameter, according to current commutation device AC and DC side voltage, permit with transverter
The maximum current being permitted to pass through is constraints, it is judged that Inverter circuit inner ring controls whether there is alternating current reference value disaggregation,
When reference value exists and solves, The present invention gives reference value method for solving, issue by the alternating current reference value that this method is tried to achieve
Transverter can be made to straight-flow system Maximum Power Output after transverter local control current inner loop, contribute to DC voltage
Recover.
For realizing the purpose of foregoing invention, solve its technical problem, the change of current when present invention provides a kind of DC voltage to fall
The control method of device maximum power output, to obtain transverter local control current inner loop d/q axle reference value idref, iqref.
For employing double-loop control, it is allowed to the maximum current passing through is ilimsTransverter, when DC voltage is less than setting
Definite value UDC1When, use maximum power output control to replace the control of former power outer shroud, maximum power output control is handed over according to transverter
Stream side equivalence total inductance Lac, equivalent total resistance Rac, current AC fundamental voltage phasor Us, DC voltage UDC, according to as follows
Step judges Inverter circuit inner ring control d/q axle reference value idref, iqrefWhether there is solution, when reference value idref, iqrefWithout solution then
Converter blocking is set；When reference value idref, iqrefSolution is had then to calculate its value and be issued to transverter local control current inner loop：
1st step is by UsEnter line translation under d/q synchronous coordinate system, obtain Us=usd+j·usq：
2nd step calculates the center of circle d axial coordinate of the alternating current reference value span of current AC DC electric pressure transverter
idref0, center of circle q axial coordinate iqref0And radius ilim0, the computing formula of each parameter such as following formula：
In formula, ω is AC network first-harmonic angular frequency；MmaxFor maximum DC voltage utilization rate；
3rd step judges whether current AC DC electric pressure transverter exists the alternating current reference value disaggregation only flowing, and sentences
Disconnected formula such as following formula：,
When above-mentioned inequality is set up, i.e. alternating current reference value disaggregation does not exists, then arrange converter blocking, move back simultaneously
Go out to calculate；
When above-mentioned inequality is false, i.e. alternating current reference value disaggregation exists, then carry out next step；
4th step calculates id, iq, its computing formula such as following formula：
Judge current i according to the following formulad, iqWhether lower transverter crosses stream：
When above-mentioned inequality is set up, i.e. only flow, then i is setdref=id, iqref=iq, proceed to the 6th step；
When above-mentioned inequality is false, then carry out next step；
5th step is judged i by following formuladref, iqrefComputational methods：
When above-mentioned inequality is set up, then i is setdref=ilims, iqref=0, proceed to the 6th step；
When above-mentioned inequality is false, then idref, iqrefComputing formula such as following formula：
Carry out next step；
The i that 6th step will drawdref, iqrefIt is issued to transverter local control current inner loop as reference value.
Compared with the conventional method, the advantage of the method is：Present invention utilizes transverter AC equivalent inductance with always
Resistance parameter, and current commutation device AC and DC side working voltage situation, give the calculating of local control current inner loop reference value
Method.When the voltage in flexible direct current electrical network significantly falls due to various reasons such as impact load or instantaneous short-circuit faults,
After using this method, transverter can keep not locking and ensure that AC system is defeated to straight-flow system while only flowing
Go out peak power, to promote the recovery of DC voltage, improve the transient voltage transient stability of flexible direct current electrical network and power supply can
By property.
Brief description
Fig. 1 is the flexible direct current line commutation station hardware schematic described in present example.
Fig. 2 is the algorithm flow chart of transverter maximum power output control method of the present invention.
Detailed description of the invention
The control method of transverter maximum power output when DC voltage of the present invention falls, is particularly suited for soft
AC current control when property direct current network voltage significantly falls, to ensure current conversion station Maximum Power Output and to keep alternating current
Flow not out-of-limit, promote the recovery of DC voltage.Below in conjunction with the accompanying drawings 1 and accompanying drawing 2 to the present invention be embodied as make furtherly
Bright.
Intelligent measuring and control device is measure and control device widely used at present, and it is generally processed by analogue collection module, central authorities
Unit, communication module, human-computer interface module etc. are constituted.
Fig. 1 illustrates a flexible direct current converter station simplified model accessing AC and DC system, and the inventive method is in intelligence
Measure and control device 1 calculates.The analogue collection module of intelligent measuring and control device 1 connects exchange by AC voltage transformer 2
Power supply, and the direct current outlet of current conversion station is connected by direct current voltage sensor 3, its communication module connects VSC local control device 4
Communication module.
Intelligent measuring and control device 1 obtains converter valve AC positive sequence total inductance by man-machine interface and AC positive sequence is always electric
Resistance, is designated as L respectivelyac、Rac, voltage stabilization lower limit, and converter valve stable state amplitude limit, it is designated as ilims, returned by analog acquisition
Drive test amount AC supply voltage fundamental phasors and DC voltage, be designated as U respectivelys、UDC, by communication module local control with VSC
Device 4 outer-loop controls the alternating current reference value providing.
Then intelligent measuring and control device 1 is by UsEnter line translation under d/q synchronous coordinate system, obtain Us=usd0+j·usq0.Then
Check DC voltage UDC, when DC voltage significantly falls, i.e. DC voltage UDCDuring less than voltage stabilization lower limit, then intelligence
VSC local control device 4 is assigned instruction by communication module and is closed power outer shroud by measure and control device 1.Enable VSC local control dress
Put the controlling unit of maximum power output in 4.
For maintenance bond transverter power output PDCMaximum, first calculates dynamic slice parameter idref0、iqref0、ilim0,
Assume to simplify the analysisThen controller is based on AC equivalence total inductance Lac, AC equivalence
All-in resistance RacWith DC voltage UDCCalculate under certain residual voltage with dynamic slice in the range of corresponding to current conversion station maximum power output
Alternating current reference value id, iq, its computing formula such as following formula：
Check id, iqIf,I is then setdref=id, and iqref=iqAs final current conversion station alternating current
Reference value；Otherwise whenSimultaneouslySet up, then i is setdref=ilims, and iqref=
0 as the reference value of current conversion station alternating current；
The i that finally will obtain abovedref, iqrefIt is issued to VSC local control device 4 as reference value by communication module
Current inner loop, transverter transverter Maximum Power Output on the premise of alternating current is not out-of-limit can be ensured, be beneficial to soft
The recovery of DC voltage in property direct current network.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read foregoing, for the present invention's
Multiple modifications and replacement all will be apparent from.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (2)
1. the control method of transverter maximum power output when a DC voltage falls, it is characterised in that：Bicyclic for using
Control, it is allowed to the maximum current passing through is ilimsTransverter, when DC voltage be less than setting value UDC1When, use maximum work
Rate output control replaces the control of former power outer shroud, and maximum power output control is according to transverter AC equivalence total inductance Lac, etc.
Effect all-in resistance Rac, current AC fundamental voltage phasor Us, DC voltage UDC, in judging Inverter circuit in accordance with the following steps
Ring controls d/q axle reference value idref, iqrefWhether there is solution, when reference value idref, iqrefConverter blocking is then set without solution；Work as ginseng
Examine value idref, iqrefSolution is had then to calculate its value and be issued to transverter local control current inner loop：
1st step is by UsEnter line translation under d/q synchronous coordinate system, obtain Us=usd+j·usq：
2nd step calculates the center of circle d axial coordinate of the alternating current reference value span of current AC DC electric pressure transverter
idref0, center of circle q axial coordinate iqref0And radius ilim0, the computing formula of each parameter such as following formula：
In formula, ω is AC network first-harmonic angular frequency；MmaxFor maximum DC voltage utilization rate；
3rd step judges whether current AC DC electric pressure transverter exists the alternating current reference value disaggregation only flowing, it is judged that
Formula such as following formula：,
When above-mentioned inequality is set up, i.e. alternating current reference value disaggregation does not exists, then arrange converter blocking, exit meter simultaneously
Calculate；
When above-mentioned inequality is false, i.e. alternating current reference value disaggregation exists, then carry out next step；
4th step calculates id, iq, its computing formula such as following formula：
Judge current i according to the following formulad, iqWhether lower transverter crosses stream：
When above-mentioned inequality is set up, i.e. only flow, then i is setdref=id, iqref=iq, proceed to the 6th step；
When above-mentioned inequality is false, then carry out next step；
5th step is judged i by following formuladref, iqrefComputational methods：
When above-mentioned inequality is set up, then i is setdref=ilims, iqref=0, proceed to the 6th step；
When above-mentioned inequality is false, then idref, iqrefComputing formula such as following formula：
Carry out next step；
The i that 6th step will drawdref, iqrefIt is issued to transverter local control current inner loop as reference value.
2. the control method of transverter maximum power output, its feature when a kind of DC voltage as claimed in claim 1 falls
It is：DC voltage utilization rate M in the computing formula of the corresponding alternating current of maximum power outputmaxThe value of maximum is 0<
Mmax<1.4.
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| CN201610323666.XA CN106451401B (en) | 2016-05-16 | 2016-05-16 | The control method of inverter maximum power output when DC voltage falls |
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| CN201610323666.XA CN106451401B (en) | 2016-05-16 | 2016-05-16 | The control method of inverter maximum power output when DC voltage falls |
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| CN106451401A true CN106451401A (en) | 2017-02-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113376542A (en) * | 2021-06-03 | 2021-09-10 | 南通通明集团有限公司 | Power supply quality detection method for distributed power supply |
| CN114285067B (en) * | 2021-12-31 | 2024-01-16 | 全球能源互联网研究院有限公司 | Fault ride-through method and device and storage medium |
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| WO2009081912A1 (en) * | 2007-12-25 | 2009-07-02 | Panasonic Electric Works Co., Ltd. | Dc power distribution system |
| US8493754B1 (en) * | 2010-09-30 | 2013-07-23 | Rockwell Collins, Inc. | Method of and apparatus for power factor correction in a power supply |
| CN103368170A (en) * | 2013-06-26 | 2013-10-23 | 许继集团有限公司 | Converter and control method of multi-end soft direct current power transmission system |
| CN104734537A (en) * | 2015-03-18 | 2015-06-24 | 国网上海市电力公司 | Control method for wind power current converter based on positive-and-negative sequence current inner-loop control |
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2016
- 2016-05-16 CN CN201610323666.XA patent/CN106451401B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009081912A1 (en) * | 2007-12-25 | 2009-07-02 | Panasonic Electric Works Co., Ltd. | Dc power distribution system |
| US8493754B1 (en) * | 2010-09-30 | 2013-07-23 | Rockwell Collins, Inc. | Method of and apparatus for power factor correction in a power supply |
| CN103368170A (en) * | 2013-06-26 | 2013-10-23 | 许继集团有限公司 | Converter and control method of multi-end soft direct current power transmission system |
| CN104734537A (en) * | 2015-03-18 | 2015-06-24 | 国网上海市电力公司 | Control method for wind power current converter based on positive-and-negative sequence current inner-loop control |
Non-Patent Citations (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113376542A (en) * | 2021-06-03 | 2021-09-10 | 南通通明集团有限公司 | Power supply quality detection method for distributed power supply |
| CN114285067B (en) * | 2021-12-31 | 2024-01-16 | 全球能源互联网研究院有限公司 | Fault ride-through method and device and storage medium |
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