CN106786747A - A kind of setting method of new energy delivery system and DC rectifier side control parameter - Google Patents
A kind of setting method of new energy delivery system and DC rectifier side control parameter Download PDFInfo
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- CN106786747A CN106786747A CN201611225126.4A CN201611225126A CN106786747A CN 106786747 A CN106786747 A CN 106786747A CN 201611225126 A CN201611225126 A CN 201611225126A CN 106786747 A CN106786747 A CN 106786747A
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- H02J3/382—
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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
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Abstract
The present invention provides the setting method of a kind of new energy delivery system and DC rectifier side control parameter, and system includes new energy transtation mission circuit, VSC, LCC, fired power generating unit and load center, wherein, new energy transtation mission circuit connection LCC grid-connected with the fired power generating unit；VSC is connected between the distal end of new energy transtation mission circuit and LCC；LCC is connected with load center.The present invention bundlees direct current delivery system for new energy with thermoelectricity, and LCC rectification current transformer ac bus are accessed for ac bus provide local reactive power compensation through VSC current transformer inversions after new energy is collected with direct current, reduces the influence to fired power generating unit stable operation.On the one hand on the other hand it is the new energy of fluctuation is exerted oneself using the flexibility of the flexible direct current power transmission system VSC support sent out as Traditional DC in order to make full use of existing Thermal Power Bases direct current to send out circuit at a distance.
Description
Technical field
The present invention relates to new energy transportation art, more particularly to a kind of new energy delivery system and DC rectifier side control ginseng
Several setting methods.
Background technology
Using when carrying out grid-connected based on LCC-HVDC, sending end LCC-HVDC is considered as passive load to large-scale wind power, if
There is no alternating-current voltage source to support at grid-connected place, then LCC current transformers may normal commutation, be that this related research unit proposes
The idea that new energy is sent out with thermoelectricity bundling, configures certain synchronous fired power generating unit and provides synchronous support in sending end power network, comes
Realize effective submitting of new energy.But the use of the program has certain limitation, especially need to match somebody with somebody in new energy base
Put substantial amounts of thermoelectricity, i.e., it is local also with putting certain installation thermoelectricity, and to be exerted oneself for new energy while tapping a new source of energy
Fluctuation, fired power generating unit also needs to frequently adjust, and increases the risk of whole system operation.
The content of the invention
The present invention provides the setting method of a kind of new energy delivery system and DC rectifier side control parameter, existing to solve
Due to the fluctuation that new energy is exerted oneself in technology, increase the technical problem of system operation risk.
The present invention provides a kind of new energy delivery system, and the system includes new energy transtation mission circuit, VSC, LCC, thermoelectricity
Unit, load center, wherein, new energy transtation mission circuit connection LCC grid-connected with the fired power generating unit；In new energy transtation mission circuit
VSC is connected between distal end and LCC；LCC is connected with load center.
Preferably, the new energy transtation mission circuit is electrically connected by transformer with the fired power generating unit with LCC.
Preferably, methods described includes：
Setting new energy direct current collects the capacity with thermoelectricity bundling direct current transmitting system；
Collected according to the new energy direct current and build Simulation Model with thermoelectricity bundling direct current transmitting system；
Determine simulation analysis boundary condition；
Contrasted by the power versus frequency curve and fired power generating unit governing system power of LCC rectification sides-rotating speed sagging curve
New energy power station is exerted oneself influence of the change to fired power generating unit speed governing, determines DC rectifier side control parameter.
The determination simulation analysis boundary condition includes：
Set the power versus frequency slope of a curve K of LCC rectification sidesfInitial value and fired power generating unit governing system power-turn
The slope K of fast sagging curvewInitial value；
Statistics and setting new energy power station are exerted oneself fluctuating change rate；
Setting LCC transmitting system oscillation of power permissible values.
Preferably, the power versus frequency curve of the LCC rectification sides is：PLCCr=PLCCr0+Kf*(f-f0), wherein, PLCCrFor
RLCC power set-point, PLCCr0It is rLCC power set-points initial value, KfIt is active power-frequency proportions slope of a curve；F is
RLCC ac bus frequencies；f0It is rLCC ac bus rated frequencies.
Preferably, the fired power generating unit governing system power-rotating speed sagging curve is Pg=Pg0+Kω*(ω0- ω), its
In, PgIt is fired power generating unit power output, Pg0It is fired power generating unit power output initial value, KwIt is oblique for power-rotating speed sagging curve
Rate, w are fired power generating unit rotating speed, w0It is fired power generating unit rated speed.
The technical scheme that embodiments of the invention are provided can include the following benefits：
The present invention provides the setting method of a kind of new energy delivery system and DC rectifier side control parameter, and system includes new
Energy transtation mission circuit, VSC, LCC, fired power generating unit and load center, wherein, new energy transtation mission circuit is grid-connected with the fired power generating unit
Connection LCC；VSC is connected between the distal end of new energy transtation mission circuit and LCC；LCC is connected with load center.Method bag
Include：Setting new energy direct current collects the capacity with thermoelectricity bundling direct current transmitting system；Collected and fire according to the new energy direct current
Electric bundling direct current transmitting system builds Simulation Model；Determine simulation analysis boundary condition；By the power of LCC rectification sides-
Frequency curve and fired power generating unit governing system power-rotating speed sagging curve contrast new energy power station exert oneself change to fired power generating unit
The influence of speed governing, determines DC rectifier side control parameter.The present invention bundlees direct current delivery system for new energy with thermoelectricity, will be new
The energy collected with direct current after through VSC current transformer inversions access LCC rectification current transformer ac bus for ac bus provide on the spot without
Work(is compensated, and reduces the influence to fired power generating unit stable operation.On the one hand in order to make full use of existing Thermal Power Bases direct current long distance
On the other hand it is that the new energy of fluctuation is gone out into masterpiece using the flexibility of flexible direct current power transmission system VSC from circuit is sent out
For the support that Traditional DC is sent out.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not
Can the limitation present invention.
Brief description of the drawings
Fig. 1 is a kind of structural representation of new energy delivery system of offer in the embodiment of the present invention；
Fig. 2 is a kind of method flow of the setting method of DC rectifier side control parameter of offer in the embodiment of the present invention
Figure；
Fig. 3 is a kind of method flow diagram of step S103 of offer in the embodiment of the present invention；
Fig. 4 is that the structure that a kind of photovoltaic plant provided in the embodiment of the present invention bundlees delivery system structure with thermal power plant is shown
It is intended to；
Fig. 5 is the different K of offer in the embodiment of the present inventionfThe system operating characteristics line chart of value.
Specific embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in implementation method do not represent and the consistent all implementation methods of the present invention.Conversely, they be only with it is such as appended
The example of the consistent device of some aspects being described in detail in claims, of the invention.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiments.
Fig. 1 is refer to, a kind of structural representation of the new energy delivery system provided in the embodiment of the present invention is provided.
As seen from Figure 1, the system includes new energy transtation mission circuit, VSC (supply convertor, English full name：voltage
Source converter), LCC (line commutation type transverter, English spelling be line commutated converter),
Fired power generating unit and load center, wherein, new energy transtation mission circuit connection LCC grid-connected with the fired power generating unit；Sent in new energy
VSC is connected between the distal end of circuit and LCC；LCC is connected with load center.LCC includes the rLCC that is sequentially connected, and (LCC is whole
Stream device, English full name：LCC rectifier) and iLCC (LCC inverters, English full name：LCC inverter).
After new energy direct current collects electric energy, transmitted to distal end VSC current transformer inversions, using iMMC (modules through direct current cables
Change many level unsteady flow inverters, English full name：MMC inverter), and the exchange of LCC rectifications current transformer is connected to by transformer
On bus, and then bundled through delivering to load center outside original LCC-HVDC with thermal power plant.VSC is using constant DC voltage control stabilization
Photovoltaic plant exports DC voltage；Due to MMC (modular multi-level converter, English full name：Modulator Multilevel
Converter vector controlled) is used, therefore, it can provide local reactive power compensation for LCC ac bus.This structure is reduced
Influence of the fluctuation of new energy to direct current transmitting system, not only takes full advantage of original DC power transmission line, and system is increased again
The flexibility of operation.
Preferably, the new energy transtation mission circuit is electrically connected by transformer with the fired power generating unit with LCC.
Fig. 2 is refer to, a kind of setting method of the DC rectifier side control parameter provided in the embodiment of the present invention is provided
Method flow diagram.
From Figure 2 it can be seen that methods described includes：
Step S101：Setting new energy direct current collects the capacity with thermoelectricity bundling direct current transmitting system.
Step S102：Collected according to the new energy direct current and build analogue system mould with thermoelectricity bundling direct current transmitting system
Type.
Step S103：Determine simulation analysis boundary condition.
Step S104：Power versus frequency curve and fired power generating unit governing system power-rotating speed by LCC rectification sides is sagging
Curve comparison new energy power station is exerted oneself influence of the change to fired power generating unit speed governing, determines DC rectifier side control parameter.
According to Study system, determine that new energy accesses the information such as the capacity and thermoelectricity, the capacity of straight-flow system of power network, will be
System simplifies turns into system shown in Figure 1.The model of analogue system is built in simulation software MATLAB or PSCAD, wherein new energy
Source is collected using direct current, using constant DC voltage control mode.
Further, in the step S102, simulation analysis boundary condition determines.The boundary condition for setting analysis includes：
Set the power versus frequency k of LCC rectification sidesfInitial value；Setting fired power generating unit governing system KwInitial value；Setting new energy power station goes out
Fluctuation rate of change；Setting LCC transmitting system oscillation of power permissible values.
Further, in the step S103, exerted oneself to change according to new energy power station influences on fired power generating unit speed governing, finally
Determine governing system dead band and DC control parameter.
Fig. 3 is refer to, a kind of method flow diagram of the step S103 provided in the embodiment of the present invention is provided.
As seen from Figure 3, the step S103 includes：
Step S1031：Set the power versus frequency slope of a curve K of LCC rectification sidesfInitial value and fired power generating unit speed governing system
The slope K of system power-rotating speed sagging curvewInitial value.
Step S1032：Statistics and setting new energy power station are exerted oneself fluctuating change rate.
Step S1033：Setting LCC transmitting system oscillation of power permissible values.
The power versus frequency curve of the LCC rectification sides is：PLCCr=PLCCr0+Kf*(f-f0), wherein, PLCCrIt is rLCC work(
Rate set-point, PLCCr0It is rLCC power set-points initial value, KfIt is active power-frequency proportions slope of a curve；F is handed over for rLCC
Stream bus frequency；f0It is rLCC ac bus rated frequencies.
The fired power generating unit governing system power-rotating speed sagging curve is Pg=Pg0+Kω*(ω0- ω), wherein, PgIt is fire
Group of motors power output, Pg0It is fired power generating unit power output initial value, KwFor the slope of power-rotating speed sagging curve, w are fire
Group of motors rotating speed, w0It is fired power generating unit rated speed.
The present invention bundlees direct current delivery system for new energy with thermoelectricity, through VSC unsteady flows after new energy direct current is collected
Device inversion accesses LCC rectification current transformer ac bus for ac bus provide local reactive power compensation, reduces to fired power generating unit stabilization
The influence of operation.On the one hand in order to make full use of existing Thermal Power Bases direct current to send out circuit at a distance, on the other hand for can profit
The new energy of fluctuation is exerted oneself as the support of Traditional DC submitting with the flexibility of flexible direct current power transmission system VSC.
For the clearer explanation present invention, for photovoltaic and thermoelectricity bundling system useable as shown in figure 4, to illustrate its principle.
When photovoltaic plant exerts oneself increase, rLCC ac bus frequency increase, rLCC transimission powers should increase therewith, therefore
RLCC transimission powers are directly proportional to its ac bus frequency, and rLCC power-frequency proportions control the expression formula to be：
PLCCr=PLCCr0+Kf*(f-f0) (1)
Wherein, PLCCrIt is rLCC power set-points, PLCCr0It is rLCC power set-point initial values；KfIt is active power-frequency
The slope of rate proportional curve；F is rLCC ac bus frequencies；f0It is rLCC ac bus rated frequencies.
The power of fired power generating unit primary frequency modulation-rotating speed droop control expression formula is：
Pg=Pg0+Kω*(ω0-ω) (2)
Wherein, PgIt is fired power generating unit power output, Pg0It is fired power generating unit power output initial value；KwFor under power-rotating speed
Catenary slope；W is fired power generating unit rotating speed, w0It is fired power generating unit rated speed.
Fig. 5 is refer to, the different K provided in the embodiment of the present invention are providedfThe system operating characteristics line chart of value.Formula
(1) correspondence characteristic line is Fig. 5 cathetus PLCC- f and straight line PLCC′-f；Formula (2) correspondence characteristic line is Fig. 5 cathetus Pg-w.As schemed
Shown in 5, work as KfWhen value is smaller, formula (1) correspondence characteristic line is straight line PLCC—f.Assuming that when initial, system operation frequency f1, this
When, rLCC transimission powers are PLCC1, fired power generating unit power output is Pg1, then PV (photovoltaic, English full name：Photovoltaic it is) defeated
Go out power for PLCC1-Pg1；When PV power outputs reduce, system frequency is by f1It is reduced to f2, rLCC transimission powers are reduced to
PLCC2, its variable quantity is Δ PLCC, fired power generating unit power output increases to Pg2, its variable quantity is Δ Pg, PV power outputs are reduced to
PLCC2-Pg2, wherein,
ΔPLCC=PLCC1-PLCC2 (3)
ΔPg=Pg2-Pg1 (4)
Work as KfWhen value is larger, formula (1) correspondence characteristic line is straight line PLCC'-f, with KfCompared when value is smaller, invariant should
It is the power output of PV.When initial, system operation frequency is f1', rLCC transimission powers are PLCC1', fired power generating unit power output is
Pg1', then PV power outputs are PLCC1′-Pg1', and should meet：
PLCC1-Pg1=PLCC1′-Pg1′ (5)
When PV power outputs reduce, system frequency is by f1' it is reduced to f2', rLCC transimission powers are reduced to PLCC2', its change
Change amount is Δ PLCC', fired power generating unit power output increases to Pg2', its variable quantity is Δ Pg', wherein,
ΔPLCC'=PLCC1′-PLCC2′ (6)
ΔPg'=Pg2′-Pg1′ (7)
PV power outputs are reduced to PLCC2′-Pg2', and should meet：
PLCC2-Pg2=PLCC2′-Pg2′ (8)
As seen from Figure 5, Δ PLCC' ＞ Δs PLCCWith Δ Pg' ＜ Δs Pg, can similarly analyze the situation of PV power outputs increase.Cause
This understands that the increase rLCC power-frequency proportions slope of curve can reduce PV output-power fluctuations to fired power generating unit output work
The influence of rate.It is also noted that (f1′-f2') ＜ (f1-f2), i.e. after rLCC power-frequency proportions slope of curve increase, PV is defeated
Go out the system frequency fluctuation range that power swing causes smaller, be more beneficial for the stable operation of system, but, rLCC power-frequency
Rate proportional curve slope crosses conference and causes system power to vibrate, therefore, desired value should be taken.
Invention described above implementation method, is not intended to limit the scope of the present invention..It is any in the present invention
Spirit and principle within modification, equivalent and the improvement made etc., should be included within the scope of the present invention.
It should be noted that herein, the relational terms of such as " first " and " second " or the like are used merely to one
Individual entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operate it
Between there is any this actual relation or order.And, term " including ", "comprising" or its any other variant be intended to
Cover including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include those
Key element, but also other key elements including being not expressly set out, or also include for this process, method, article or set
Standby intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in the process including the key element, method, article or equipment.
The above is only specific embodiment of the invention, is made skilled artisans appreciate that or realizing this hair
It is bright.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The scope most wide for causing.
Claims (6)
1. a kind of new energy delivery system, it is characterised in that the system includes new energy transtation mission circuit, VSC, LCC, thermal motor
Group, load center, wherein, new energy transtation mission circuit connection LCC grid-connected with the fired power generating unit；In the remote of new energy transtation mission circuit
VSC is connected between end and LCC；LCC is connected with load center.
2. new energy delivery system according to claim 1, it is characterised in that the new energy transtation mission circuit and the fire
Group of motors is electrically connected by transformer with LCC.
3. the setting method of a kind of DC rectifier side control parameter, it is characterised in that methods described includes：
Setting new energy direct current collects the capacity with thermoelectricity bundling direct current transmitting system；
Collected according to the new energy direct current and build Simulation Model with thermoelectricity bundling direct current transmitting system；
Determine simulation analysis boundary condition；
New energy is contrasted by the power versus frequency curve and fired power generating unit governing system power of LCC rectification sides-rotating speed sagging curve
Influence of the source output of power station change to fired power generating unit speed governing, determines DC rectifier side control parameter.
4. the setting method of DC rectifier side according to claim 3 control parameter, it is characterised in that the determination emulation
Analysis boundary condition includes：
Set the power versus frequency slope of a curve K of LCC rectification sidesfInitial value and fired power generating unit governing system power-rotating speed it is sagging
Slope of a curve KwInitial value；
Statistics and setting new energy power station are exerted oneself fluctuating change rate；
Setting LCC transmitting system oscillation of power permissible values.
5. the setting method of DC rectifier side according to claim 3 control parameter, it is characterised in that the LCC rectifications
The power versus frequency curve of side is：PLCCr=PLCCr0+Kf*(f-f0), wherein,
PLCCrIt is rLCC power set-point, PLCCr0It is rLCC power set-points initial value, KfIt is active power-frequency proportions curve
Slope；F is rLCC ac bus frequencies；f0It is rLCC ac bus rated frequencies.
6. the setting method of DC rectifier side according to claim 3 control parameter, it is characterised in that the fired power generating unit
Governing system power-rotating speed sagging curve is Pg=Pg0+Kω*(ω0- ω), wherein,
PgIt is fired power generating unit power output, Pg0It is fired power generating unit power output initial value, KwIt is oblique for power-rotating speed sagging curve
Rate, w are fired power generating unit rotating speed, w0It is fired power generating unit rated speed.
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Citations (3)
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|---|---|---|---|---|
| CN104037788A (en) * | 2014-06-16 | 2014-09-10 | 东南大学 | Wind fire bundling system control device and method thereof |
| CN104882900A (en) * | 2015-06-19 | 2015-09-02 | 华北电力大学 | Direct current power transmission control method suitable for large-scale wind power outward transmission |
| CN105071427A (en) * | 2015-08-10 | 2015-11-18 | 许继电气股份有限公司 | Method for controlling extra-high-voltage direct current to be accessed to isolated doubly-fed wind power station |
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2016
- 2016-12-27 CN CN201611225126.4A patent/CN106786747B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104037788A (en) * | 2014-06-16 | 2014-09-10 | 东南大学 | Wind fire bundling system control device and method thereof |
| CN104882900A (en) * | 2015-06-19 | 2015-09-02 | 华北电力大学 | Direct current power transmission control method suitable for large-scale wind power outward transmission |
| CN105071427A (en) * | 2015-08-10 | 2015-11-18 | 许继电气股份有限公司 | Method for controlling extra-high-voltage direct current to be accessed to isolated doubly-fed wind power station |
Non-Patent Citations (1)
| Title |
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| 宋梦晨: "直流调制改善风火打捆交直流系统的频率稳定性研究", 《中国优秀硕士学位论文全文数据库》 * |
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