CN106451401B - The control method of inverter maximum power output when DC voltage falls - Google Patents
The control method of inverter maximum power output when DC voltage falls Download PDFInfo
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- CN106451401B CN106451401B CN201610323666.XA CN201610323666A CN106451401B CN 106451401 B CN106451401 B CN 106451401B CN 201610323666 A CN201610323666 A CN 201610323666A CN 106451401 B CN106451401 B CN 106451401B
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- inverter
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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 control method of inverter maximum power output when falling the invention discloses a kind of DC voltage, this method are converter stations when substantially falling for voltage in flexible direct current power grid, and control inverter carries out maximum power output under conditions of not overcurrent.Inverter exchange side equivalent inductance and all-in resistance parameter is utilized in the method for the present invention, according to current commutation device AC and DC side voltage, using inverter allow by maximum current as constraint condition, judge Inverter circuit inner loop control with the presence or absence of alternating current reference value disaggregation, when reference value, which exists, to be solved, The present invention gives reference value method for solving, the alternating current reference value acquired by this method, which is issued to after inverter locally controls current inner loop, can make inverter to direct current system Maximum Power Output, facilitate the recovery of DC voltage.
Description
Technical field
The control method of inverter maximum power output when falling the present invention relates to a kind of DC voltage, to remain flexible straight
Flow the transient stability of network voltage.
Background technique
Due to the lesser feature of flexible direct current electrical network capacity, when the access of big load or dc-side short-circuit, it is easy to cause straight
Galvanic electricity pressure is significantly fallen.In addition, due to investment/excision randomness of load or distributed generation resource, and due to direct current net
The impedance of network is smaller, so each converter station connection of multiterminal distribution network systems is closely, also increases and occurs in flexible direct current power grid
The probability of Voltage Drop.Therefore suitable control strategy is used when inverter need not be latched to maintain stablizing for DC voltage to have
It makes great sense, the power supply that frequently locking will seriously affect flexible direct current power grid for otherwise controlling the converter station of DC voltage can
By property.
Inverter local control action is the power instruction provided according to system control, coordinates interior inverter voltage adjusting of standing
Value, and the conversion of setting valve to trigger pulse is completed, the double-closed-loop control device based on VSC Direct Current Control is generallyd use, point
For current inner loop and active power outer ring.
The case where for Voltage Drop, the method that existing flexible direct current power grid control method generallys use converter blocking
Reply (if direct-current short circuit failure occurs, it is also necessary to which AC circuit breaker disconnects or inverter automatically cleared failure).But in practical feelings
In condition, unless inverter exit interpolar metallic short circuit occurs, a possibility that DC voltage drops to 0 is very little.If
System will lead to using blocking method and lose control to inverter output power.And with the development of dc circuit breaker, the change of current
The situation that device must be latched will be fewer and fewer, such as when DC side line short, the converter station for having installed dc circuit breaker additional is not necessarily to
Locking disconnects connected AC circuit breaker.To keep inverter not to be latched in the case where Voltage Drop, need in local
The stable state clipping (limitation of DC voltage utilization rate) and dynamic slice (limitation of IGBT fever) of inverter are considered in control.
Summary of the invention
The control method of inverter maximum power output when falling the object of the present invention is to provide a kind of DC voltage, with reality
Now when voltage significantly falls, control inverter carries out maximum power output under conditions of not overcurrent.The method of the present invention benefit
Exchanging side equivalent inductance and all-in resistance parameter with inverter is allowed according to current commutation device AC and DC side voltage with inverter
By maximum current be constraint condition, judge Inverter circuit inner loop control with the presence or absence of alternating current reference value disaggregation, when
When reference value has solution, The present invention gives reference value method for solving, the alternating current reference value acquired by this method is issued to
Inverter can make inverter to direct current system Maximum Power Output after locally controlling current inner loop, facilitate the extensive of DC voltage
It is multiple.
For the purpose for realizing foregoing invention, its technical problem is solved, the present invention provides change of current when a kind of DC voltage falls
The control method of device maximum power output, to obtain inverter locally control current inner loop d/q axis reference value idref, iqref。
For use double -loop control, allow by maximum current be ilimsInverter, when DC voltage is lower than setting
Definite value UDC1When, it is controlled using maximum power output and replaces former power outer loop control, maximum power output control is handed over according to inverter
Flow the equivalent total inductance L in sideac, equivalent total resistance Rac, current to exchange side group wave voltage phasor Us, DC voltage UDC, according to as follows
Step judges Inverter circuit inner loop control d/q axis reference value idref, iqrefWhether solution is had, as reference value idref, iqrefThen without solution
Converter blocking is set；As reference value idref, iqrefThere is solution then to calculate its value and be issued to inverter locally control current inner loop:
Step 1 is by UsIt is converted under d/q synchronous coordinate system, obtains Us=usd+j·usq:
The center of circle d axis that step 2 calculates the alternating current reference value value range of current AC DC electric pressure inverter is sat
Mark idref0, center of circle q axial coordinate iqref0And radius ilim0, the calculation formula of each parameter such as following formula:
ω is AC network fundamental wave frequency in formula；MmaxFor maximum DC voltage utilization rate；
Step 3 judges that current AC DC electric pressure inverter whether there is the alternating current reference value disaggregation of not overcurrent,
Judgment formula such as following formula:
When above-mentioned inequality is set up, i.e., alternating current reference value disaggregation is not present, then converter blocking is arranged, moves back simultaneously
It calculates out；
When above-mentioned inequality is invalid, i.e., alternating current reference value disaggregation exists, then carries out in next step；
Step 4 calculates id, iq, calculation formula such as following formula:
Current i is judged according to the following formulad, iqLower inverter whether overcurrent:
When above-mentioned inequality is set up, i.e. i is then arranged in not overcurrentdref=id, iqref=iq, it is transferred to step 6；
When above-mentioned inequality is invalid, then carry out in next step；
Step 5 judges i by following formuladref, iqrefCalculation method:
When above-mentioned inequality is set up, then i is setdref=ilims, iqref=0, it is transferred to step 6；
When above-mentioned inequality is invalid, then idref, iqrefCalculation formula such as following formula:
It carries out in next step；
The i that step 6 will obtaindref, iqrefInverter locally control current inner loop is issued to as reference value.
Compared with the conventional method, the advantages of this method is: present invention utilizes inverter exchange side equivalent inductance and 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 power grid significantly falls due to the various reasons such as impact load or instantaneous short-circuit failure,
After this method, inverter can keep not being latched and guaranteeing that AC system is defeated to direct current system while not overcurrent
Maximum power out, to promote the recovery of DC voltage, the transient voltage transient stability and power supply for improving flexible direct current power grid can
By property.
Detailed description of the invention
Fig. 1 is flexible direct current line commutation station hardware schematic described in present example.
Fig. 2 is the algorithm flow chart of inverter maximum power output control method of the present invention.
Specific embodiment
The control method of inverter maximum power output, is particularly suitable for soft when DC voltage of the present invention falls
AC current control when property DC grid voltage significantly falls, to guarantee converter station Maximum Power Output and keep alternating current
Stream is not out-of-limit, promotes the recovery of DC voltage.With reference to the accompanying drawing 1 and 2 pairs of attached drawing specific implementations of the invention make furtherly
It is bright.
Intelligent measuring and control device is the measure and control device being widely used at present, it is usually by analogue collection module, central processing
Unit, communication module, human-computer interface module etc. are constituted.
Fig. 1 shows the flexible direct current converter station simplified models that one is accessed AC and DC system, and the method for the present invention is in intelligence
It is calculated in measure and control device 1.The analogue collection module of intelligent measuring and control device 1 passes through the connection exchange of AC voltage transformer 2
Power supply, and exported by the direct current that direct current voltage sensor 3 connects converter station, communication module connects the local VSC control system 4
Communication module.
Intelligent measuring and control device 1 by man-machine interface obtain converter valve exchange side positive sequence total inductance with to exchange side positive sequence always electric
Resistance, is denoted as L respectivelyac、Rac, voltage stabilization lower limit value and converter valve stable state clipping are denoted as ilims, returned by analog acquisition
Drive test amount AC supply voltage fundamental phasors and DC voltage, are denoted as U respectivelys、UDC, locally controlled by communication module and VSC
The alternating current reference value that outer loop control provides in system 4.
Then intelligent measuring and control device 1 is by UsIt is converted under d/q synchronous coordinate system, obtains Us=usd0+j·usq0.Then
Check DC voltage UDC, when DC voltage substantially falls, i.e. DC voltage UDCIt is when lower than voltage stabilization lower limit value, then intelligent
Measure and control device 1 assigns instruction to the local VSC control system 4 by communication module and closes power outer ring.Enable VSC locally control system
The controlling unit of maximum power output in system 4.
For maintenance bond inverter output power PDCMaximum, first calculating dynamic slice parameter idref0、iqref0、ilim0,
Assume to simplify the analysisThen controller is based on the exchange equivalent total inductance L in sideac, exchange side it is equivalent total
Resistance RacWith DC voltage UDCCalculate under certain residual voltage with friendship corresponding to converter station maximum power output within the scope of dynamic slice
Flow current reference value id, iq, calculation formula such as following formula:
Check id, iqIfI is then setdref=id, and iqref=iqAs final converter station alternating current
Reference value；Otherwise whenSimultaneouslyIt sets up, then i is setdref=ilims, and iqref=
0 reference value as converter station alternating current；
The i that will finally obtain abovedref, iqrefThe local VSC control system 4 is issued to by communication module as reference value
Current inner loop, that is, can guarantee inverter inverter Maximum Power Output under the premise of alternating current is not out-of-limit, in favor of soft
The recovery of DC voltage in property DC grid.
It is discussed in detail although the contents of the present invention have passed through 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 above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (2)
- The control method of inverter maximum power output when 1. a kind of DC voltage falls, it is characterised in that: for using bicyclic Control, allow by maximum current be ilimsInverter, when DC voltage be lower than setting value UDC1When, using maximum work Rate output control replaces former power outer loop control, and maximum power output control exchanges the equivalent total inductance L in side according to inverterac, etc. Imitate all-in resistance Rac, current to exchange side group wave voltage phasor Us, DC voltage UDC, judge in Inverter circuit in accordance with the following steps Ring controls d/q axis reference value idref, iqrefWhether solution is had, as reference value idref, iqrefConverter blocking is then arranged in no solution；Work as ginseng Examine value idref, iqrefThere is solution then to calculate its value and be issued to inverter locally control current inner loop:Step 1 is by UsIt is converted under d/q synchronous coordinate system, obtains Us=usd+j·usq:Step 2 calculates the center of circle d axial coordinate of the alternating current reference value value range of current AC DC electric pressure inverter idref0, center of circle q axial coordinate iqref0And radius ilim0, the calculation formula of each parameter such as following formula:ω is AC network fundamental wave frequency in formula；MmaxFor maximum DC voltage utilization rate；Step 3 judges alternating current reference value disaggregation of the current AC DC electric pressure inverter with the presence or absence of not overcurrent, judgement Formula such as following formula:When above-mentioned inequality is set up, i.e., alternating current reference value disaggregation is not present, then converter blocking is arranged, while exiting meter It calculates；When above-mentioned inequality is invalid, i.e., alternating current reference value disaggregation exists, then carries out in next step；Step 4 calculates id, iq, calculation formula such as following formula:Current i is judged according to the following formulad, iqLower inverter whether overcurrent:When above-mentioned inequality is set up, i.e. i is then arranged in not overcurrentdref=id, iqref=iq, it is transferred to step 6；When above-mentioned inequality is invalid, then carry out in next step；Step 5 judges i by following formuladref, iqrefCalculation method:When above-mentioned inequality is set up, then i is setdref=ilims, iqref=0, it is transferred to step 6；When above-mentioned inequality is invalid, then idref, iqrefCalculation formula such as following formula:It carries out in next step；The i that step 6 will obtaindref, iqrefInverter locally control current inner loop is issued to as reference value.
- The control method of inverter maximum power output, feature when 2. a kind of DC voltage as described in claim 1 falls It is: DC voltage utilization rate M in the calculation formula of the corresponding alternating current of maximum power outputmaxThe value of maximum value be 0 < Mmax<1.4。
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| CN113376542B (en) * | 2021-06-03 | 2023-01-31 | 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 |
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 |
-
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)
| Title |
|---|
| 直流配网中换流站的电流限幅控制研究;金阳忻等;《机电工程》;20160430;第470-475页 |
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