CN109787267A - A kind of double-fed blower accesses the determination method of weak receiving-end system through VSC-HVDC - Google Patents
A kind of double-fed blower accesses the determination method of weak receiving-end system through VSC-HVDC Download PDFInfo
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- CN109787267A CN109787267A CN201910214607.2A CN201910214607A CN109787267A CN 109787267 A CN109787267 A CN 109787267A CN 201910214607 A CN201910214607 A CN 201910214607A CN 109787267 A CN109787267 A CN 109787267A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The present invention relates to a kind of double-fed blowers to access the determination method of weak receiving-end system through VSC-HVDC, to determine whether double-fed blower can access weak receiving-end system through VSC-HVDC, comprising the following steps: 1) establish the structural model that double-fed blower accesses weak receiving-end system through VSC-HVDC；2) control mode of VSC is determined；3) using critical short-circuit ratio CSCR as Judging index, and judge whether double-fed blower can access weak receiving-end system through VSC-HVDC with this.Compared with prior art, the present invention has many advantages, such as that consideration is comprehensive, jointly controls, rational judgment.
Description
Technical field
The present invention relates to the double-fed fan motor fields of VSC-HVDC to be incorporated to weak AC system, passes through more particularly, to a kind of double-fed blower
VSC-HVDC accesses the determination method of weak receiving-end system.
Background technique
With the development of wind generating technology, wind power plant has received widespread attention through the grid-connected problem of direct current transportation.Tradition
Commutation voltage of the HVDC Transmission Technology (LCC-HVDC) during grid-connected is provided by receiving-end system, is easy to happen commutation failure,
And demand of the system to reactive power is very big.Flexible DC transmission technology (VSC-HVDC) nothing based on voltage converter
Commutation voltage is needed, it can be achieved that remote power transmission, and has access to weak receiving-end system even passive network.
There are larger impacts for stability of the degree of strength of receiving-end system to VSC-HVDC, and the prior art is with short-circuit ratio
(SCR) Judging index as receiving end AC system degree of strength, working as SCR>3 is strong system, and 2<SCR<3 are weak pattern system, SCR
< 2 unite for pole weak pattern.The SCR for dividing strong and weak system is boundary short-circuit ratio (BSCR), and it is critical for dividing the SCR of weak and pole weak pattern system
Short-circuit ratio (CSCR), is limited to the control mode of current transformer, and VSC-HVDC cannot couple extremely weak receiving-end system.
When being connected into the SCR of receiving-end system lower than critical value, the Current Vector Control system of VSC current transformer is unable to proper solution
Coupling, so that VSC is not able to maintain steady operational status." the VSC-HVDC stable operation zone research for being coupled to weak AC system " discusses
For VSC under two kinds of control modes, receiving-end system parameter show that VSC-HVDC couples weak receiving end system with SCR changing rule
The stable operation zone of system, but do not consider influence of the power generation end to system operating characteristics." the VSC- based on critical short-circuit ratio
The operation characteristic of HVDC access weak AC system " restriction VSC-HVDC has been probed into from the angle of maximum transmission power is coupled to weak exchange
The influence factor of system, it is indicated that the AC system accessed need to meet CSCR > 1.4, but its calculating process idealization.It is " remote
Sea wind electric field couples the critical operation characteristic of weak receiving-end system through VSC-HVDC " control mode based on DFIG and VSC, it has studied
The critical operation characteristic of weak receiving-end system is accessed, and proposes can be used the new approaches of Measures of Reactive Compensation, however does not provide reality
Example.
Have at present and discusses that the operation after VSC (voltage source converter) access weak AC system is special based on short-circuit ratio (SCR)
Journal of Sex Research.Some researchs divide the boundary short-circuit ratio (BSCR) of strong AC system, weak AC system and pole weak AC system and face
Boundary's short-circuit ratio (CSCR), and point out that VSC-HVDC cannot be incorporated to the pole weak AC system lower than critical short-circuit ratio.Some researchs are begged for
The VSC control mode for being connected to weak AC system has been discussed, and has obtained the stable operation zone under different control modes and critical short circuit
Than.However existing research does not provide the occurrence of critical short-circuit ratio mostly, and does not account for double-fed blower as power generator
When the case where.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of double-fed blowers to pass through
VSC-HVDC accesses the determination method of weak receiving-end system.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of double-fed blower accesses the determination method of weak receiving-end system through VSC-HVDC, to determine that double-fed blower whether can
It is enough to access weak receiving-end system through VSC-HVDC, comprising the following steps:
1) structural model that double-fed blower accesses weak receiving-end system through VSC-HVDC is established；
2) control mode of VSC is determined；
3) using critical short-circuit ratio CSCR as Judging index, and judge whether double-fed blower can connect through VSC-HVDC with this
Enter weak receiving-end system.
In the step 2), remain unchanged the transmission power of VSC using constant dc power control mode.
In the step 3), the acquisition methods of critical short-circuit ratio CSCR the following steps are included:
31) the power flow equation group that VSC accesses weak receiving-end system is obtained, and there are real numbers with the power flow equation of simultaneous after abbreviation
It solves as the constraint condition for capableing of stable operation after the weak receiving-end system of access；
32) security constraints of weak receiving-end system voltage bound are set；
33) value range for setting SCR obtains its corresponding Q for the value of each SCR respectivelyr1, Qr2, QhAnd Ql
Value, as min (Qr1, Qr2, Qh)=QlWhen, then will at this time corresponding SCR value as critical short-circuit ratio CSCR.
In the step 31), VSC accesses the expression formula of the power flow equation group of weak receiving-end system are as follows:
UsUtCos δ=Ut 2-QX-PR
UsUtSin δ=PX-QR
Then there is simultaneous after abbreviation:
Wherein, UtFor VSC ac bus voltage, UsFor ideal voltage source, X is the equivalent impedance that VSC accesses receiving-end system
Imaginary part, Q are the reactive power of VSC conveying, and P is the active power of VSC conveying, and δ is phase angle, R be VSC access receiving-end system etc.
It is worth the real part of impedance.
In the step 32), the security constraints of weak receiving-end system voltage bound are as follows:
Utmax≥Ut≥Utmin
Wherein, Utmax、UtminRespectively weak receiving-end system voltage bound.
In the step 33), the QhAnd QlThe corresponding reactive power of respectively weak receiving-end system voltage bound
Value；
The Qr1Value is defined as: with the reduction of reactive power value Q, the power flow equation of weak receiving-end system is intended to nothing
Solution, then when power flow equation is critical solution, corresponding Q value is denoted as Qr1；
The Qr2Value is defined as: in the solution of the power flow equation of weak receiving-end system, q shaft current isqThere are minimums
The corresponding Q value of inflection point is denoted as Qr2。
In the step 33), the value range of reactive power value Q are as follows:
min(Qr1,Qr2,Qh)≥Q≥Ql。
In the step 3), when the short-circuit ratio SCR value of weak receiving-end system is less than critical short-circuit ratio CSCR, then determine double
Feedback blower cannot access weak receiving-end system through VSC-HVDC, when the short-circuit ratio SCR value of weak receiving-end system is greater than critical short-circuit ratio
When CSCR, then determine that double-fed blower can access weak receiving-end system through VSC-HVDC.
Compared with prior art, the invention has the following advantages that
One, what the present invention had fully considered DFIG blower and VSC current transformer jointly controls strategy.
Two, the present invention considers a variety of operation constraint conditions, show that VSC accesses the critical short-circuit ratio of weak receiving-end system.
Three, the present invention considers the operation characteristic due to blower, causes the variation of access receiving-end system degree of strength, analyzes it
Reason, and effective short-circuit ratio that reactive compensation is added is provided as the strong and weak Judging index under such operating condition.
Detailed description of the invention
Fig. 1 is that VSC accesses weak AC system structure.
When Fig. 2 is that SCR takes different value, UtWith the situation of change of Q.
When Fig. 3 is that SCR takes different value, iadWith the situation of change of Q.
When Fig. 4 is that SCR takes different value, isqWith the situation of change of Q.
Fig. 5 is Qr1, Qr2, Qh, QlRespectively with the changing rule of SCR.
Fig. 6 is grid connected structure figure of the double-fed fan motor field through VSC-HVDC.
Fig. 7 is the wind speed small disturbed stability of different short-circuit ratio receiving-end systems.
Fig. 8 is the voltage change of the corresponding PCC point bus of different short-circuit ratioes.
Fig. 9 is rotor-side converter Control figure.
Figure 10 is flow chart of the method for the present invention.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in Figure 10, the present invention provides the determination method that a kind of double-fed blower accesses weak receiving-end system through VSC-HVDC,
The following steps are included:
Step 1: by VSC in the weak expression formula by related system variables of constant dc power control mode lower link, propose for
Guarantee system safe and stable operation constraint condition criterion, can obtain the Critical operating point of system stable operation, and then sum up nothing
The acquiring method of function critical value and critical short-circuit ratio.
Step 2: having built the mathematical model for accessing weak receiving-end system through VSC-HVDC using DFIG as power generator, chosen
Suitable control strategy, it is indicated that due to the operation characteristic of double-fed blower, the critical short-circuit ratio of the receiving-end system of access cannot reach reason
The reason of by value.
Step 3: realizing and work as according to reactive power compensation on the spot principle as Judging index by effective critical short-circuit ratio
Fitting of the DFIG as power generator access receiving-end system critical value and theoretical value, while also proving critical value proposed above and asking
Solution method is still set up under this operating condition.
Specific step is as follows:
1. obtaining the power flow equation group of VSC access weak AC system first:
UsUtCos δ=Ut 2-QX-PR
UsUtSin δ=PX-QR
2. the frequent switching of power can lead to the problem of loss and system is unstable, in conjunction with double in practical receiving-end system
Present fan converter control, select constant dc power control mode make VSC obtain transimission power guarantee as far as possible it is constant.It crosses for simplifying the analysis
Journey, only consider ignore AC system resistance i.e. when impedance angle φ=90 ° the case where, then have:
UsUtCos δ=Ut 2-QX
UsUtSin δ=PX
3. meeting following constraint to guarantee that the power flow equation group solution after VSC access weak AC system exists:
Δ=Us 4+4Us 2QX-4P2X2≥0
Need to meet the security constraints of receiving-end system voltage bound:
Utmin≤Ut≤Utmax
Usual UtminTake 0.95pu, UtmaxTake 1.05pu
4.VSC accesses weak AC system structure, using short-circuit ratio as measurement AC system relative strength index:
When by system model parameter be Sc=1.00pu, Us=1.00pu, X=1.00pu passes through having for control VSC output
Function power constantly changes receiving-end system SCR.
When SCR is definite value, UtProportional relationship is presented with Q, when Q is definite value, isdIt is in inversely prroportional relationship with SCR, i.e.,
With P proportional
As Q is worth reducing, power flow equation group is also intended to no solution, and enabling trend, critical to have Q when solution be Qr1
Guaranteeing system voltage UtRange also the subtracting with SCR of Q is adjusted in full voltage bound safe operating conditions, VSC
It is small and reduce, by UmaxAnd UminCorresponding idle upper lower limit value is set to QhAnd Ql.As SCR=1, Ut> 1.05 permanent establishments, i.e.,
System be unsatisfactory for safe operation constraint and it is unrelated with Q value size；When SCR=1.5, Qh=0.29pu, Ql=0.23pu；SCR=2
When, Qh=0.18pu, Ql=0.09pu；
In Fig. 4, when SCR=1, isqThere are di at Q=0.77pusqMinimum when/dQ=0, if this inflection point corresponds to Q value
For Qr2.When SCR is larger, it is ensured that disq/ dQ is greater than zero and sets up, and Q is not presentr2
min(Qr1, Qr2, Qh)≥Q≥Ql
To sum up, it can be gathered that the method for solving of CSCR:
According to Ut、isdAnd isqWith the change curve of Q, different SCR are passed through into above 4 calculating, Q can be obtainedr1, Qr2,
Qh, QlRespectively with the changing rule of SCR.As min (Qr1, Qr2, Qh)=QlWhen, gained Q can regard as Qr, corresponding SCR definition
For CSCR.
The critical operation state under 4 reactive power constraint condition can be obtained as a result,.It can be more intuitive in conjunction with figure and table
The double-fed blower that obtains access U through the fixed active VSC-HVDC for determine Reactive Power Controls=1.00pu, X=1.00pu it is weak by
The calculated value Q of critical point data when end systemr=0.45, CSCR=1.21.
Influence of the double-fed blower to CSCR:
The simulation model that DFIG accesses weak receiving-end system through VSC-HVDC is built in DIgSILENT/PowerFactory,
While meeting formula stable operation constraint condition, the wind speed small disturbed stability emulation of different short-circuit ratio receiving-end systems is observed,
Such as Fig. 7
In rectification current transformer side bus setting three-phase ground short circuit, and failure is cut off after 0.15s, different short-circuit ratioes are corresponding
PCC point bus voltage change such as Fig. 8
Ignore direct current system temporal variations, i.e. DC bus-bar voltage is definite value[6], rotor-side inverter (RSC) is using being based on
The Stator flux oriented control of power control method can reach the purpose of active power and reactive power decoupling, select Double
Closed-loop control model, outer ring are active-power PsWith voltage UsControl, inner ring are vector current control.Simple controller chassis
Scheme such as Fig. 9, x in figureαFor inverter state variable, α=1,2,3,4；kpα、kiαRefer to corresponding proportional integration constant；idr、iqrAnd Udr、
UqrThe dq axis component of corresponding RSC Current Voltage.
The control structure of net side inverter (GSC) is similar with rotor-side inverter, outer loop control DC voltage, inner loop control
Rotor-side induced current, the output power expression formula of last DFIG are as follows:
When enabling receiving-end system voltage direction identical as d axis direction, U in formula (2)d=UN, Uq=0, then:
In conjunction with the definition of short-circuit ratio, the flow equation and double-fed blower output power expression formula of VSC, San Zhelian
Then vertical can obtain obtains:
Present invention introduces the concepts of effective short-circuit ratio, carry out reactive power compensation on the spot to receiving-end system, CSCR may make to reach
Theoretical value.Using the generated energy of blower as the controlled variable of emulation experiment, then by adjusting the impedance value of receiving-end system, obtain energy
System is set to meet the CSCR value of safe and stable operation condition.
Claims (8)
1. a kind of double-fed blower accesses the determination method of weak receiving-end system through VSC-HVDC, to determine that double-fed blower whether can
Weak receiving-end system is accessed through VSC-HVDC, which comprises the following steps:
1) structural model that double-fed blower accesses weak receiving-end system through VSC-HVDC is established；
2) control mode of VSC is determined；
3) using critical short-circuit ratio CSCR as Judging index, and it is weak with this to judge whether double-fed blower can access through VSC-HVDC
Receiving-end system.
2. a kind of double-fed blower according to claim 1 accesses the determination method of weak receiving-end system through VSC-HVDC, special
Sign is, in the step 2), remains unchanged the transmission power of VSC using constant dc power control mode.
3. a kind of double-fed blower according to claim 1 accesses the determination method of weak receiving-end system through VSC-HVDC, special
Sign is, in the step 3), the acquisition methods of critical short-circuit ratio CSCR the following steps are included:
31) the power flow equation group that VSC accesses weak receiving-end system is obtained, and there are real solution works with the power flow equation of simultaneous after abbreviation
To access after weak receiving-end system the constraint condition for capableing of stable operation；
32) security constraints of weak receiving-end system voltage bound are set；
33) value range for setting SCR obtains its corresponding Q for the value of each SCR respectivelyr1, Qr2, QhAnd QlValue, when
min(Qr1, Qr2, Qh)=QlWhen, then will at this time corresponding SCR value as critical short-circuit ratio CSCR.
4. a kind of double-fed blower according to claim 3 accesses the determination method of weak receiving-end system through VSC-HVDC, special
Sign is, in the step 31), VSC accesses the expression formula of the power flow equation group of weak receiving-end system are as follows:
UsUtCos δ=Ut 2-QX-PR
UsUtSin δ=PX-QR
Then there is simultaneous after abbreviation:
Wherein, UtFor VSC ac bus voltage, UsFor ideal voltage source, X is the void for the equivalent impedance that VSC accesses receiving-end system
Portion, Q are the reactive power of VSC conveying, and P is the active power of VSC conveying, and δ is phase angle, and R is the equivalence that VSC accesses receiving-end system
The real part of impedance.
5. a kind of double-fed blower according to claim 4 accesses the determination method of weak receiving-end system through VSC-HVDC, special
Sign is, in the step 32), the security constraints of weak receiving-end system voltage bound are as follows:
Utmax≥Ut≥Utmin
Wherein, Utmax、UtminRespectively weak receiving-end system voltage bound.
6. a kind of double-fed blower according to claim 5 accesses the determination method of weak receiving-end system through VSC-HVDC, special
Sign is, in the step 33), the QhAnd QlThe corresponding reactive power value of respectively weak receiving-end system voltage bound；
The Qr1Value is defined as: with the reduction of reactive power value Q, the power flow equation of weak receiving-end system is intended to no solution,
Then when power flow equation is critical solution, corresponding Q value is denoted as Qr1；
The Qr2Value is defined as: in the solution of the power flow equation of weak receiving-end system, q shaft current isqThere are minimum inflection points pair
The Q value answered is denoted as Qr2。
7. a kind of double-fed blower according to claim 6 accesses the determination method of weak receiving-end system through VSC-HVDC, special
Sign is, in the step 33), the value range of reactive power value Q are as follows:
min(Qr1,Qr2,Qh)≥Q≥Ql。
8. a kind of double-fed blower according to claim 6 accesses the determination method of weak receiving-end system through VSC-HVDC, special
Sign is, in the step 3), when the short-circuit ratio SCR value of weak receiving-end system is less than critical short-circuit ratio CSCR, then determines double
Feedback blower cannot access weak receiving-end system through VSC-HVDC, when the short-circuit ratio SCR value of weak receiving-end system is greater than critical short-circuit ratio
When CSCR, then determine that double-fed blower can access weak receiving-end system through VSC-HVDC.
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