CN106160023B - A kind of Hybrid HVDC receiving end weak grid frequency cooperative control method - Google Patents
A kind of Hybrid HVDC receiving end weak grid frequency cooperative control method Download PDFInfo
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- CN106160023B CN106160023B CN201510184604.0A CN201510184604A CN106160023B CN 106160023 B CN106160023 B CN 106160023B CN 201510184604 A CN201510184604 A CN 201510184604A CN 106160023 B CN106160023 B CN 106160023B
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Abstract
The present invention relates to a kind of Hybrid HVDC receiving end weak grid frequency cooperative control methods, and Hybrid HVDC system sending end is 12 pulsating current source inverters, using constant DC current control；Receiving end is MMC inverter, is controlled using DC voltage is determined with alternating voltage is determined；The receiving end weak grid frequency fluctuation caused for instantaneous load jump or Smaller load fluctuation realizes frequency support by regulator module capacitance voltage analog synchronous generator inertia to slow down receiving end weak grid frequency fluctuation；System allowed band is exceeded for frequency departure caused by load switching, the active power of sending end output is adjusted according to frequency-current characteristic curve, the virtual inertia of receiving end submodule capacitor voltage simulation is cooperated to carry out frequency adjusting to receiving-end system jointly, technical solution provided by the invention, to the rapidly and efficiently synergic adjustment of receiving end weak grid frequency, reduces instantaneity load fluctuation to the dependence of interior communication and sending end inverter adjustment effect using Hybrid HVDC system.
Description
Technical field
The present invention relates to a kind of control method of transmission & distribution electro-technical field, in particular to a kind of Hybrid HVDC receiving end
Weak grid frequency cooperative control method.
Background technique
Current source converter (csc) based on line commutation is only applicable to the electric system with certain short-circuit ratio, therefore in receiving end
To be difficult to maintain normal operating condition under weak grid operating condition.By voltage source converter of the receiving end converter station based on wholly-controled device
Substitution constitutes Hybrid HVDC system, can power to weak AC network.
Since the installed capacity of receiving end weak grid is limited, whole system inertia is small, and frequent load switching will lead to receiving end
AC system frequency it is unstable, need by adjust direct current system transimission power so that AC system frequency is maintained normal model
Within enclosing.HVDC transmission system of the tradition based on current source converter (csc), sending end use constant current control, and receiving end is using fixed electricity
Pressure or the control of fixed interest arc angle.The frequency of sending end converter station is transmitted a signal to by interior communication when receiving end frequency is deviated
Controller adjusts the power of sending end converter station conveying.Due to the sluggishness of transmission signal, the control precision of system is influenced, it is furthermore right
The frequency caused by instantaneous load changes instantaneously jumps, and sending end frequency controller can not act in time, and frequent switching frequency control
Device processed also brings along additional equipment loss.
Summary of the invention
To solve above-mentioned deficiency of the prior art, the object of the present invention is to provide a kind of Hybrid HVDC receiving end light current
Net frequency cooperative control method, the receiving end weak grid system frequency caused for the jump of general instantaneous load or Smaller load fluctuation
Rate fluctuation, slows down receiving end weak grid frequency fluctuation by regulator module capacitance voltage analog synchronous generator inertia, realizes
Frequency support；System allowed band is exceeded for frequency departure caused by other types of load switching, according to frequency-electric current
Characteristic curve adjusts the active power of sending end output, while cooperating virtual inertia provided by receiving end submodule capacitor voltage common
Frequency adjusting is carried out to receiving-end system；Method provided by the invention is realized using Hybrid HVDC system to receiving end weak grid
Quick, the efficient synergic adjustment function of frequency can effectively reduce instantaneity load fluctuation to interior communication and sending end inverter tune
The dependence of section effect.
In order to which some aspects of the embodiment to disclosure have a basic understanding, simple summary is shown below.It should
Summarized section is not extensive overview, nor to determine key/critical component or describe the protection scope of these embodiments.
Its sole purpose is that some concepts are presented with simple form, in this, as the preamble of following detailed description.
The purpose of the present invention is adopt the following technical solutions realization:
The present invention provides a kind of Hybrid HVDC receiving end weak grid frequency cooperative control method, the system of the method
For Hybrid HVDC system, sending end is 12 pulsating current source inverters, using constant DC current control；Its receiving end is module
Change multilevel converter, is controlled using DC voltage is determined with alternating voltage is determined；It is improved in that the method includes following
Step:
I, the absolute value of receiving end weak grid system frequency deviation is obtained | Δ f |, and it is permitted with receiving end AC system maximum
Perhaps frequency departure is compared, if | Δ f | within the deviation range of receiving end AC system operation, exit frequency collaboration
Control；It is no to then follow the steps II；
II, the DC voltage reference instruction for determining receiving end modularization multi-level converter constant DC voltage control device；
III, delay Δ t and the absolute value for judging receiving end weak grid system frequency deviation again | Δ f | it whether is more than receiving end
The maximum frequency deviation that AC system allows, if | Δ f | it is exited if within the deviation range that Hybrid HVDC system allows
Frequency control, it is no to then follow the steps IV；
IV, frequency adjusting is carried out to Hybrid HVDC system receiving end.
Further, it in the step II, is changed according to synchronous generator rotor mechanical characteristic equation with modular multilevel
The energy-transfer equation of stream device submodule capacitor obtains the direct current of receiving end modularization multi-level converter constant DC voltage control device
Voltage instruction；The synchronous generator rotor mechanical characteristic equation is indicated with following the equation (1):
Wherein: PmFor mechanical output, PeFor electromagnetic power, J is rotary inertia, SMFor the specified of Hybrid HVDC system
Power；F indicates receiving end AC system frequency；P.u. per unit value is indicated；
The energy-transfer equation of Modularized multi-level converter sub-module capacitor is indicated with following the equation (2):
Wherein: P1For the active power of Modularized multi-level converter sub-module input, P2For modularization multi-level converter
The active power of submodule output, N are submodule number, SMMCFor the rated power of modularization multi-level converter；UdcIndicate mixed
Close the DC voltage of DC transmission system；
Enable P1=Pm, P2=Pe, then have:
U is obtained to (3) formula both sides Integration SolvingdcrefExpression formula:
Wherein: Udc0For Hybrid HVDC system nominal DC voltage；UdcrefTo determine direct voltage reference value, Udc0It is mixed
Close DC transmission system rated direct voltage, ω0And f0Respectively receiving end AC network rated angular velocity and frequency, C are every height
The capacitance of module；
The default direct voltage reference value that the fluctuation range that receiving end allows in DC voltage is adjusted according to formula (4), utilizes son
The charge and discharge process simulation rotary inertia of module capacitance voltage provides frequency support to receiving end weak grid.
Further, in the step IV, according to power system static frequency characteristic, it is assumed that route DC voltage is kept not
Become, obtains sending end DC current IdcWith the characteristic curve between receiving end AC system frequency f, and sending end direct current is obtained according to curve
Current reference value Idcref, the active power of regulating system conveying, while cooperating virtual provided by receiving end submodule capacitor voltage
Inertia carries out frequency adjusting to receiving-end system jointly.
Compared with the immediate prior art, the excellent effect that technical solution provided by the invention has is:
(1) present invention using submodule capacitor voltage charge and discharge process simulation synchronous generator rotary inertia, enhancing by
There is support to make for the system inertia for holding weak grid, the system frequency variation caused to instantaneous load jump and Smaller load fluctuation
With；The dependence to sending end frequency controller can be effectively reduced, reduce interior communication number, be conducive to extend equipment uses the longevity
Life.
(2) receiving end AC system frequency caused by big load switching is changed, by adjusting sending end DC current ginseng
Value is examined, and cooperates receiving end DC voltage control, the power for quickly adjusting direct current system conveying may be implemented, maintains receiving end exchange system
The frequency stabilization of system.
For the above and related purposes, one or more embodiments include being particularly described below and in claim
In the feature that particularly points out.Certain illustrative aspects are described in detail in the following description and the annexed drawings, and its instruction is only
Some modes in the utilizable various modes of the principle of each embodiment.Other benefits and novel features will be under
The detailed description in face is considered in conjunction with the accompanying and becomes obvious, the disclosed embodiments be all such aspects to be included and they
Be equal.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is logic function flow chart provided by the invention；
Fig. 2 is receiving end converter Control block diagram provided by the invention；
Fig. 3 is the performance diagram between sending end DC current provided by the invention and receiving-end system frequency.
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Practice them.Other embodiments may include structure, logic, it is electrical, process and other change.Embodiment
Only represent possible variation.Unless explicitly requested, otherwise individual component and function are optional, and the sequence operated can be with
Variation.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.This hair
The range of bright embodiment includes equivalent obtained by the entire scope of claims and all of claims
Object.Herein, these embodiments of the invention can individually or generally be indicated that this is only with term " invention "
For convenience, and if in fact disclosing the invention more than one, the range for being not meant to automatically limit the application is to appoint
What single invention or inventive concept.
The present invention provides a kind of Hybrid HVDC receiving end weak grid frequency cooperative control method, wherein Hybrid HVDC
System sending end is 12 pulsating current source inverters, and uses constant DC current control；Receiving end is modularization multi-level converter, is adopted
It is controlled with DC voltage is determined with alternating voltage is determined.
As shown in FIG. 1, FIG. 1 is a kind of Hybrid HVDC receiving end weak grid frequency cooperative control method implementation flow charts；
Specifically comprise the following steps:
I, the absolute value of receiving end weak grid system frequency deviation is obtained | Δ f |, and by its frequency maximum allowable in system
Deviation is compared, if | Δ f | frequency Collaborative Control is exited if within the deviation range of system operation, it is no to then follow the steps
II；
II, according to the energy of synchronous generator rotor mechanical characteristic equation and Modularized multi-level converter sub-module capacitor
Exchange equation obtains the DC voltage instruction of receiving end modularization multi-level converter constant DC voltage control device；The synchronous generator
Machine rotor mechanical characteristic equation is indicated with following the equation (1):
Wherein: PmFor mechanical output, PeFor electromagnetic power, J is rotary inertia, SMFor the specified of Hybrid HVDC system
Power；F receiving end AC system frequency；P.u. per unit value is indicated；
The energy-transfer equation of Modularized multi-level converter sub-module capacitor is indicated with following the equation (2):
Wherein: P1For the active power of Modularized multi-level converter sub-module input, P2For modularization multi-level converter
The active power of submodule output, N are submodule number, SMMCFor the rated power of modularization multi-level converter；UdcIndicate mixed
Close the DC voltage of DC transmission system；
Enable P1=Pm, P2=Pe, then have:
U is obtained to (3) formula both sides Integration SolvingdcrefExpression formula:
Wherein: Udc0For Hybrid HVDC system nominal DC voltage；UdcrefTo determine direct voltage reference value, Udc0It is mixed
Close DC transmission system rated direct voltage, ω0And f0Respectively receiving end AC network rated angular velocity and frequency, C are every height
The capacitance of module；
Receiving end converter Control block diagram is specific as shown in Fig. 2, f is the receiving end AC system frequency detected, f in figure0For
Direct voltage reference value U is calculated by formula (4) according to the difference Δ f of the two in AC system rated frequencydcref, for siding stopping
Module capacitance voltage magnitude fluctuates within the range of permission, need to limit direct voltage reference value；By what is be calculated
Direct voltage reference value UdcrefWith system dc voltage measured value UdcIt is sent into outer ring PI controller as input signal after making the difference,
Inner ring current reference value i is calculatedd*；The idle quasi-controller of converter station is by determining reactive power and determining two kinds of alternating voltage, friendship
Galvanic electricity pressure difference e (Uac) or reactive power difference e (Q) through outer ring PI controller generate current reference value iq*；id、iqFor receiving end friendship
Galvanic electricity stream dq component measured value generates voltage control signal V through inner ring current controllerd* with Vq*, to utilize submodule capacitor
The charge and discharge process simulation rotary inertia of voltage provides frequency support to receiving end weak grid.
III, delay Δ t simultaneously judge again | Δ f | the maximum frequency deviation whether allowed more than system, if | Δ f | be
Frequency control is then exited within the deviation range allowed of uniting, it is no to then follow the steps IV；
IV, according to power system static frequency characteristic, and assume that route DC voltage remains unchanged, sending end direct current can be obtained
Electric current IdcCharacteristic curve between receiving-end system frequency f is as shown in figure 3, when receiving-end system frequency deviation is in systems operating range
Within when, current reference value IdcrefIt remains unchanged, when receiving end frequency f exceeds system allowed band Δ fmaxWhen, according to the slope of curve
α adjusts DC current reference value Idcref, and then the active power of regulating system conveying, while cooperating receiving end submodule capacitor voltage
Provided virtual inertia carries out frequency adjusting to receiving-end system jointly.
Technical solution provided by the invention realize using Hybrid HVDC system to receiving end weak grid frequency it is quick,
Efficient synergic adjustment function, can effectively reduce dependence of the instantaneity load fluctuation to interior communication and sending end inverter adjustment effect
Property.
It should be understood that the particular order or level of the step of during disclosed are the examples of illustrative methods.Based on setting
Count preference, it should be appreciated that in the process the step of particular order or level can be in the feelings for the protection scope for not departing from the disclosure
It is rearranged under condition.Appended claim to a method is not illustratively sequentially to give the element of various steps, and not
It is to be limited to the particular order or level.
In above-mentioned detailed description, various features are combined together in single embodiment, to simplify the disclosure.No
This published method should be construed to reflect such intention, that is, the embodiment of theme claimed needs clear
The more features of the feature stated in each claim to Chu.On the contrary, that reflected such as appended claims
Sample, the present invention are in the state fewer than whole features of disclosed single embodiment.Therefore, appended claims is special
This is expressly incorporated into detailed description, and wherein each claim is used as alone the individual preferred embodiment of the present invention.
Description above includes the citing of one or more embodiments.Certainly, in order to describe above-described embodiment and description portion
The all possible combination of part or method is impossible, but it will be appreciated by one of ordinary skill in the art that each implementation
Example can do further combinations and permutations.Therefore, embodiment described herein is intended to cover fall into the appended claims
Protection scope in all such changes, modifications and variations.In addition, with regard to term used in specification or claims
The mode that covers of "comprising", the word is similar to term " includes ", just as " including " solved in the claims as transitional word
As releasing.In addition, the use of any one of specification in claims term "or" being to indicate " non-exclusionism
Or ".
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, and those of ordinary skill in the art still can be to this hair
Bright specific embodiment is modified or replaced equivalently, these without departing from spirit and scope of the invention any modification or
Equivalent replacement, within the scope of the claims of the invention pending application.
Claims (2)
1. a kind of Hybrid HVDC receiving end weak grid frequency cooperative control method, the system of the method are that mixed DC is defeated
Electric system, sending end is 12 pulsating current source inverters, using constant DC current control；Its receiving end is the modular multilevel change of current
Device is controlled using DC voltage is determined with alternating voltage is determined；It is characterized in that, the method includes the following steps:
I, the absolute value of receiving end weak grid system frequency deviation is obtained | Δ f |, and it is maximum allowable with receiving end AC system
Frequency departure is compared, if | Δ f | within the deviation range of receiving end AC system operation, exit frequency collaboration control
System；It is no to then follow the steps II；
II, the DC voltage reference instruction for determining receiving end modularization multi-level converter constant DC voltage control device；
III, delay Δ t and the absolute value for judging receiving end weak grid system frequency deviation again | Δ f | it whether is more than that receiving end exchanges
The maximum frequency deviation that system allows, if | Δ f | frequency is exited if within the deviation range that Hybrid HVDC system allows
Control, it is no to then follow the steps IV；
IV, frequency adjusting is carried out to Hybrid HVDC system receiving end；
In the step II, according to synchronous generator rotor mechanical characteristic equation and Modularized multi-level converter sub-module capacitor
Energy-transfer equation obtain receiving end modularization multi-level converter constant DC voltage control device DC voltage instruction；It is described same
Walk generator amature mechanical characteristic equation is indicated with following the equation (1):
Wherein: PmFor mechanical output, PeFor electromagnetic power, J is rotary inertia, SMFor the rated power of Hybrid HVDC system；
F indicates receiving end AC system frequency；P.u. per unit value is indicated；
The energy-transfer equation of Modularized multi-level converter sub-module capacitor is indicated with following the equation (2):
Wherein: P1For the active power of Modularized multi-level converter sub-module input, P2For modularization multi-level converter submodule
The active power of block output, N are submodule number, SMMCFor the rated power of modularization multi-level converter；UdcIndicate that mixing is straight
Flow the DC voltage of transmission system；
Enable P1=Pm, P2=Pe, then have:
U is obtained to (3) formula both sides Integration SolvingdcrefExpression formula:
Wherein: Udc0For Hybrid HVDC system nominal DC voltage；UdcrefTo determine direct voltage reference value, ω0And f0Respectively
For receiving end AC network rated angular velocity and frequency, C is the capacitance of each submodule；
The default direct voltage reference value that the fluctuation range that receiving end allows in DC voltage is adjusted according to formula (4), utilizes submodule
The charge and discharge process simulation rotary inertia of capacitance voltage provides frequency support to receiving end weak grid.
2. frequency cooperative control method as described in claim 1, which is characterized in that in the step IV, according to electric system
Static frequency characteristic, it is assumed that route DC voltage remains unchanged, and obtains sending end DC current IdcWith receiving end AC system frequency f it
Between characteristic curve, and sending end DC current reference value I is obtained according to curvedcref, the active power of regulating system conveying, simultaneously
Virtual inertia provided by receiving end submodule capacitor voltage is cooperated to carry out frequency adjusting to receiving-end system jointly.
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| CN107086590B (en) * | 2017-06-30 | 2023-11-17 | 南方电网科学研究院有限责任公司 | Coordination control method, device and power transmission system for hybrid direct current station control |
| CN109861265B (en) * | 2018-12-28 | 2022-05-03 | 四川大学 | Virtual inertia control method for accessing wind power plant to weak power grid through MMC-HVDC |
| CN110391667B (en) * | 2019-07-11 | 2020-07-14 | 广东电网有限责任公司 | Control method for reducing frequent switching of filter in hybrid direct-current power transmission system |
| CN112054551B (en) * | 2020-09-14 | 2021-07-16 | 南方电网科学研究院有限责任公司 | External characteristic testing method for hybrid two-end direct-current power transmission system |
| CN112636324B (en) * | 2020-11-09 | 2023-09-26 | 上海电力大学 | Stability judging method and system for feeding multiple power electronic devices into complex weak power grid |
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