CN106786734A - Power grid wind accesses site selecting method - Google Patents
Power grid wind accesses site selecting method Download PDFInfo
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Abstract
Site selecting method is accessed the invention discloses a kind of power grid wind, including：Model buildings are carried out according to systems organization；Load flow calculation is carried out to system using the Load flow calculation module of PSD BPA；Stability Calculation is carried out to system using the stability Calculation module of PSD BPA；Wind power integration influence is analyzed, the analysis includes：Voltage deviation, power system network loss, Short circuit ratios, voltage pulsation, voltage flicker, voltage stability harmonic；By gradually increasing blower fan installed capacity, wind-powered electricity generation maximum access capability is calculated, obtain the maximum wind access capability of the access point；And the access near step 6, selection wind power plant can reconnaissance, calculated according to step one to step 4 for the different optional points of access, will be no more than influenceing small optional access point as the optimal access point of wind power plant in the case of correlation standard.The present invention gives a kind of preferably site selecting method, wind-powered electricity generation maximum access capability and optimal access point are given.
Description
Technical field
Site selecting method is accessed the present invention relates to a kind of power grid wind.
Background technology
Wind energy has the advantages that renewable, pollution-free, reserves are big, widely distributed, while wind as a kind of renewable resource
Electricity is lower compared with other new energy costs, and technology is also more ripe, the condition for possessing large-scale commercial applications exploitation, therefore has turned into the world
The important component of the energy.
But, due to some characteristics that wind-power electricity generation possesses, wind-electricity integration can influence the operation stability of power system, system
About its extensive development.The active power of Wind turbines is mainly determined by wind speed, and wind speed has intermittent and randomness,
Therefore wind power also has the features such as randomness and fluctuation, and the randomness and fluctuation of wind power can be made to power system
Into many negative effects, such as Power System Voltage Stability, the quality of power supply are all adversely affected.Because wind power plant is built mostly
In power network end, network structure is weak, and impact resistance is limited in one's ability, while with wind power plant number and the continuous increasing of installed capacity
Plus, more by the way of power transmission network is incorporated on a large scale, therefore, the quality of power supply and safe operation of the wind-electricity integration to power network
The influence for causing is more and more very important, and Voltage-stabilizing Problems have turned into the key factor for restricting wind farm grid-connected capacity.It is another
Aspect, wind-powered electricity generation schedulability in the state of the art is poor, and the wind power plant being incorporated into the power networks is one random for power network
Disturbing source, therefore turn into wind power plant planning and designing problem in the urgent need to address to the overall merit of wind power plant access scheme.
In general, Power System Voltage Stability refers to that power system is maintained under normal operation or after being disturbed
Ability of all busbar voltages in the steady-state value that can be born.The access of wind power plant is disturbed equivalent to being applied with one to power system
Dynamic source, the trend distribution of power system is accessed by wind power plant and is influenceed to change, and causes line voltage that significant changes, wind occur
The electric grid-connected influence to line voltage mainly has three below aspect：
1) because wind-powered electricity generation has randomness and intermittence, wind-electricity integration can influence the quality of power supply of power network, such as produce voltage
Fluctuation, flickering, harmonic wave etc..
2) blower fan set end voltage reduction will cause blower interior electric current to increase, and can shorten service life of equipment, or even cause
Device damage, in order to avoid such case, all blower fans are equipped with undervoltage protection, when set end voltage is certain less than certain
During value, protection device action cuts off blower fan from power network.Therefore, when system occurs disturbance causes set end voltage too low, blower fan
It is removed, it will acceleration system Voltage Instability, or even triggers collapse of voltage.
3) due to the idle characteristic of Wind turbines itself, when output of wind electric field changes, reactive power fluctuation can be caused, is led
The voltage pulsation in cause system particularly wind-electricity integration region, influences the voltage stability of system.
While output of wind electric field increases, the reactive power increase in demand of wind power plant and its grid-connected circuit, if power network is not
Enough reactive power supports can be provided, fan end brownout can be caused, the normal operation of influence wind power plant and the voltage of system are steady
It is qualitative, therefore the stabilization that reactive power compensator carrys out maintenance voltage is installed generally at generator terminal.Wind power plant in low injecting power, by
In wind power plant for power network provides active power, system load flow distribution is improved, reduce the reactive loss on branch road, system is each
Individual node is in voltage level higher；When output of wind electric field is higher, the nothing of wind-electricity integration circuit reactive loss and wind power plant
Work(demand increases, and causes wind power plant and its neighbouring node voltage level to decline, and voltage stability reduction wind-powered electricity generation injecting power is to section
Point voltage level and system voltage stability have a very big impact, given power network receptible wind-powered electricity generation capacity be it
Wind power integration ability is limited, determines the problem that the wind power integration ability always operational planner of power network extremely pays close attention to.
The content of the invention
Site selecting method is accessed it is an object of the invention to provide a kind of power grid wind, so that power grid wind accesses addressing
Rationally, various standards and regulation are met.
Therefore, site selecting method is accessed the invention provides a kind of power grid wind, including：Step one：According to systems organization
Carry out model buildings；Step 2：Load flow calculation is carried out to system using the Load flow calculation module of PSD-BPA；Step 3：Utilize
The stability Calculation module of PSD-BPA carries out stability Calculation to system；Step 4：Wind power integration influence is analyzed, including：Electricity
Pressure variance analysis, power system Losses Analysis, Short circuit ratios analysis, voltage pulsation analysis, voltage flicker analysis, voltage stabilization
Property analysis and frequency analysis；Step 5：Wind-powered electricity generation maximum access capability is calculated：Gradually increase in step one to step 4
Blower fan installed capacity, and method according to step one to step 4 calculated, and is until being unsatisfactory for relevant criterion in step 4
Only, the blower fan installed capacity for now obtaining is the maximum wind access capability of the access point；And step 6：Selection wind power plant is attached
Near access can reconnaissance, calculated according to step one to step 4 for the different optional points of access, and enter according to step 4
Row analysis, will be wind power plant access address no more than small optional access point selection is influenceed in the case of correlation standard.
Further, above-mentioned voltage deviation analysis includes：Substation bus bar voltage change situation according to wind power integration is entered
Row voltage deviation is calculated.
Further, above-mentioned Short circuit ratios analysis includes：According to the capacity of short circuit of wind power integration point, and filled according to wind-powered electricity generation
Machine capacity, calculates Short circuit ratios K.
Further, above-mentioned voltage flicker analysis includes：According to wind electric field blower quantity N, the i-th Fans installed capacity,
Flickering coefficient under given electric network impedance angle and wind speed of electric network impedance angle, wind speed, the i-th Fans, access point capacity of short circuit are obtained
To short time flicker severity and long-time Term Flicker Severity, wherein, blower fan quantity N, the i-th Fans installed capacity are advised by power network
Draw file to obtain, electric network impedance angle is obtained by the access point equivalent impedance that stability Calculation is obtained.
Further, above-mentioned Voltage stability analysis include：The pressure sensitive of wind power integration point is obtained by Load flow calculation
Degree coefficient, and be analyzed according to voltage sensibility coefficient magnitude, wherein, voltage stability discriminant approach is：It was judged at that time
Voltage stabilization.
Further, above-mentioned frequency analysis includes：Calculated according to blower fan harmonic electric current and access point equivalent impedance
To harmonic voltage, wherein harmonic current is obtained by fan parameter, and access point equivalent impedance is obtained by stability Calculation, harmonic voltage meter
Calculation method is：Harmonic current is multiplied with equivalent impedance and obtains.
Power grid wind of the invention accesses site selecting method, by analyzing influence of the wind power plant access to power network, system
Setting analysis content and relevant evaluation index, can not only look for optional access point, but also can determine to electric network influencing compared with
Small access point, so as to optimize the access addressing of power grid wind.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to figure, the present invention is further detailed explanation.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing a further understanding of the present invention, of the invention to show
Meaning property and its illustrates, for explaining the present invention, not constitute inappropriate limitation of the present invention embodiment.In the accompanying drawings：
Fig. 1 is the flow chart that power grid wind of the invention accesses site selecting method；
Fig. 2 is the schematic diagram of the scheme 1 of the access addressing example that power grid wind of the invention accesses site selecting method；
And
Fig. 3 is the schematic diagram of the scheme 2 of the access addressing example that power grid wind of the invention accesses site selecting method.
Specific embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 1 to Fig. 3 shows some embodiments of the invention.
As shown in figure 1, power grid wind of the invention accesses site selecting method, comprise the following steps：
Step one, foundation systems organization carry out farm model and build：
Wind power plant Static Equivalent model structure includes：Wind-driven generator, blower fan change, wind power plant main transformer, circuit.Wind power plant is moved
State Equivalent Model parameter includes：Wind generator class, wind-driven generator control mode.Static Equivalent model is set up in .dat texts
In part.Dynamic equivalent model is set up in .swi files.Wind-driven generator model parameter includes：Title, access point, controlling party
Formula, power.
In PSD-BPA (power system analysis software), flow data file is .dat files.Correspondence wind power integration point
Analysis is, it is necessary to increase newly-built wind power plant related data.Needing newly-built data includes：Node data card, transformer data card, circuit
Data card.Node data card includes：The data card of wind-driven generator and the data card of bus.Exchange node data card is B cards.
In PSD-BPA, stabilization data file is .swi files..swi the data in file need and data phase in .dat
Correspondence, for newly-built and missing data, it is necessary to supply.
Step 2, Load flow calculation is carried out to system
Load flow calculation is obtained by the Load flow calculation function of PSD-BPA.The input data of Load flow calculation is .dat files, defeated
Go out data for .pfo files.
Step 3, stability Calculation is carried out to system
Stability Calculation is obtained by the stability Calculation function of PSD-BPA.Stability Calculation input data be .swi files and
.pfo file, output data is .out files.
Step 4, wind power integration impact analysis
Wind power integration impact analysis includes：Voltage deviation is analyzed；Power system Losses Analysis；Short circuit ratios are analyzed；Electricity
Pressure fluction analysis；Voltage flicker is analyzed；Voltage stability analysis；Frequency analysis.
Voltage deviation analysis method is：Substation bus bar voltage change situation according to wind power integration carries out voltage deviation meter
Calculate.Voltage deviation should meet following standard：《Quality of power supply admissible deviation of supply volt- age》(GB12325-2008)；《Wind power plant connects
Enter electric power network technique regulation》Q/GDW 392-2009.
Short circuit ratios analysis method is：According to the capacity of short circuit of wind power integration point, and according to installed capacity of wind-driven power, calculate
Short circuit ratios K.
Short circuit ratios K is smaller, and wind power integration effect is better.The value country for the Short circuit ratios K there is no phase
Evaluation criterion is closed, can be with the evaluation index of foreign, such as：Denmark is 5%, and Japan is 10%.
Voltage flicker analysis method is：According to wind electric field blower quantity N, the i-th Fans installed capacity, electric network impedance angle,
The flickering coefficient of wind speed, the i-th Fans under given electric network impedance angle and wind speed is, access point capacity of short circuit can be obtained in short-term
Between Term Flicker Severity and long-time Term Flicker Severity.The blower fan quantity N, the i-th Fans installed capacity are by Electric Power Network Planning file
Obtain.Electric network impedance angle is obtained by the access point equivalent impedance that stability Calculation is obtained.I-th Fans are in given electric network impedance
Flickering coefficient under angle and wind speed is to be obtained by blower fan specification.The mark of short time flicker severity and long-time Term Flicker Severity
It is accurate referring to：《Quality of power supply voltage fluctuation and flicker》(GB12326-2000).
Voltage stability analysis method is：Obtain the voltage sensibility coefficient of wind power integration point by Load flow calculation, and according to
It is analyzed according to voltage sensibility coefficient magnitude.Voltage stability method of discrimination is：It is judged to voltage stabilization at that time.
Harmonic analysis method is：Harmonic voltage is calculated according to blower fan harmonic electric current and access point equivalent impedance.
The harmonic current is obtained by fan parameter.Described access point equivalent impedance is obtained by stability Calculation.Harmonic voltage computational methods
For：Harmonic current is multiplied with equivalent impedance and obtains.The harmonic wave size criterion referring to：《Quality of power supply utility network harmonic wave》
(GB/T14549-93)。
Step 5, wind-powered electricity generation maximum access capability analysis
The method of maximum access capability analysis is gradually to increase installed capacity of wind-driven power in step one, and according to step one to
The method of step 4 is calculated, untill being unsatisfactory for relevant criterion in step 4.The installed capacity of wind-driven power for now obtaining
It is the maximum wind access capability of the access point.
Step 6, wind-powered electricity generation addressing optimization
Addressing optimization refer to when planning wind power plant have different access point optional times, respectively select diverse access point according to
Step one to step 4 is calculated, and analysis method according to step 4 is analyzed, no more than correlation standard
The small access point of situation selection influence.
Blower fan addressing example one
## wind power plants are grid-connected using 110kV voltage class.Its scheme 1 is by new pool station access system, as shown in Figure 1.
Scheme 2 be by He Zhuan stand access system, as shown in Figure 2.## wind power plant plan current period installed capacity 50MW, final installed capacity
150MW。
## wind fields maximum access capability is, by above-mentioned correlation analysis, gradually to increase wind-powered electricity generation capacity until being unsatisfactory for related wanting
Ask to determine ## wind fields maximum access capability, table specific as follows：
From upper table data, He Zhuan stations maximum wind access capability is more than new pool station.It all meets final access and builds
It is required that.
New pool station access point track investment construction cost the most is small, and operation network loss is small.All meeting wind power integration requirement
In the case of, new pool station access scheme is better than He Zhuanzhan.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (6)
1. a kind of power grid wind accesses site selecting method, it is characterised in that including：
Step one：Model buildings are carried out according to systems organization；
Step 2：Load flow calculation is carried out to system using the Load flow calculation module of PSD-BPA；
Step 3：Stability Calculation is carried out to system using the stability Calculation module of PSD-BPA；
Step 4：Wind power integration influence is calculated, including：Voltage deviation analysis, power system Losses Analysis, capacity of short circuit
Than analysis, voltage pulsation analysis, voltage flicker analysis, Voltage stability analysis and frequency analysis；
Step 5：Wind-powered electricity generation maximum access capability is calculated：Gradually increase blower fan installed capacity in step one to step 4,
And the method according to step one to step 4 is calculated, untill being unsatisfactory for relevant criterion in step 4, now obtain
Blower fan installed capacity is the maximum wind access capability of the access point；And
Step 6：Optional access point near selection wind power plant, for the different optional points of access according to step one to step 4
Calculated, and be analyzed according to step 4, small optional access point is influenceed in the case of correlation standard being no more than
It is wind power plant access address to select.
2. wind power plant according to claim 1 accesses site selecting method, it is characterised in that the voltage deviation analysis includes：
Substation bus bar voltage change situation according to wind power integration carries out voltage deviation calculating.
3. wind power plant according to claim 1 accesses site selecting method, it is characterised in that the Short circuit ratios analysis bag
Include：According to the capacity of short circuit of wind power integration point, and according to installed capacity of wind-driven power, Short circuit ratios K is calculated.
4. wind power plant according to claim 1 accesses site selecting method, it is characterised in that the voltage flicker analysis includes：
According to wind electric field blower quantity N, the i-th Fans installed capacity, electric network impedance angle, wind speed, the i-th Fans in given electric network impedance
Flickering coefficient, access point capacity of short circuit under angle and wind speed obtain short time flicker severity and long-time Term Flicker Severity, its
In, the blower fan quantity N, the i-th Fans installed capacity are obtained by Electric Power Network Planning file, and the electric network impedance angle is by stability Calculation
The access point equivalent impedance for obtaining is obtained.
5. wind power plant according to claim 1 accesses site selecting method, it is characterised in that the Voltage stability analysis bag
Include：The voltage sensibility coefficient of wind power integration point is obtained by Load flow calculation, and is divided according to voltage sensibility coefficient magnitude
Analysis, wherein, voltage stability discriminant approach is：It is judged to voltage stabilization at that time.
6. wind power plant according to claim 1 accesses site selecting method, it is characterised in that the frequency analysis includes：According to
Blower fan harmonic electric current and access point equivalent impedance are calculated harmonic voltage, wherein the harmonic current is obtained by fan parameter
Arrive, described access point equivalent impedance is obtained by stability Calculation, the harmonic voltage computational methods are：Harmonic current and equivalent impedance
Multiplication is obtained.
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| CN108416459A (en) * | 2018-01-19 | 2018-08-17 | 大连理工大学 | A kind of site selecting method of battery energy storage power station |
| CN112906172A (en) * | 2021-02-23 | 2021-06-04 | 国网山东省电力公司经济技术研究院 | Onshore grid-connected point optimal selection method and system for large-scale offshore wind farm |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107546782A (en) * | 2017-10-24 | 2018-01-05 | 国网山东省电力公司经济技术研究院 | A kind of evaluation method of the single-point access installed capacity of wind-driven power based on short circuit calculation |
| CN108416459A (en) * | 2018-01-19 | 2018-08-17 | 大连理工大学 | A kind of site selecting method of battery energy storage power station |
| CN108416459B (en) * | 2018-01-19 | 2021-04-20 | 大连理工大学 | Site selection method for battery energy storage power station |
| CN112906172A (en) * | 2021-02-23 | 2021-06-04 | 国网山东省电力公司经济技术研究院 | Onshore grid-connected point optimal selection method and system for large-scale offshore wind farm |
| CN112906172B (en) * | 2021-02-23 | 2023-04-18 | 国网山东省电力公司经济技术研究院 | Onshore grid-connected point optimal selection method and system for large-scale offshore wind farm |
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