CN105048483A - Energy-storage capacity configuration method and system for PV-containing power distribution network - Google Patents
Energy-storage capacity configuration method and system for PV-containing power distribution network Download PDFInfo
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
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Abstract
The invention provides an energy-storage capacity configuration method and system for a PV-containing power distribution network, and the method comprises the steps: collecting network frame parameters, a daily load in a maximum operation mode in a last time period, and a daily active power output of a photovoltaic power station; obtaining the daily operation voltage data of a photovoltaic grid-connected point at each moment through load flow calculation; setting the upper and lower limits of voltage constraint of the photovoltaic grid-connected point; obtaining an energy-storage power output array of each sampling point through employing a grid-connected point equal-step-length power injection method according to an operation voltage of the photovoltaic grid-connected point; and obtaining the energy-storage configuration capacity according to the integration of time step lengths. The whole process is simple and visual, and the voltage constraint on the energy-storage capacity configuration is considered. The energy-storage capacity configuration is carried out from an angle of preventing the voltage of the photovoltaic grid-connected point from being exceeds the limits. A configuration index is visual, is easy to measure, is effective and can be used for the determining of the energy-storage capacity and the optimization of the energy-storage capacity configuration under the condition of giving consideration to the voltage constraint.
Description
Technical field
The present invention relates to electric power network technical field, particularly relate to the energy accumulation capacity configuration containing photovoltaic power distribution network and system.
Background technology
Along with the fast development of economy, continuing to increase of electricity needs, the deterioration increasingly of the day by day deficient and environment of traditional energy, photovoltaic generation large-scale grid connection has become development trend.
But photovoltaic is subject to Natural resources condition and weather influence obviously, has fluctuation and intermittent feature, causes disturbance and impact to a certain extent, even cause voltage out-of-limit, affect the safe and reliable stable operation of electrical network the power distribution network of access.In order to utilize illumination resource to greatest extent, photovoltaic generation runs with unity power factor usually, and energy storage is in the meritorious advantage having its uniqueness that exports of balance, therefore, can effectively regulate grid-connected point voltage in grid-connected configuration energy storage, the stored energy capacitance configuration therefore how carrying out photovoltaic power distribution network is also known as in order to a difficult problem in the urgent need to address.
In recent years, have both at home and abroad much about the collocation method of stored energy capacitance, but there is the shortcoming of energy storage distribu-tion index inadequate problem and complicated operation intuitively in conventional method.
Summary of the invention
Based on this, be necessary to there is the directly perceived not and problem of complexity of energy storage distribu-tion index for the collocation method of the general stored energy capacitance containing photovoltaic power distribution network, provide a kind of energy storage distribu-tion index directly perceived and the simple energy accumulation capacity configuration containing photovoltaic power distribution network and system.
Containing an energy accumulation capacity configuration for photovoltaic power distribution network, comprise step:
Gather Net Frame of Electric Network parameter, maximum operational mode daily load and photovoltaic plant day gained merit and exert oneself in the upper time period;
According to Net Frame of Electric Network parameter, maximum operational mode daily load and photovoltaic plant day gained merit and exert oneself in the upper time period, adopt distribution power system load flow calculation, obtain grid-connected some day operation voltage data;
According to electric power netting safe running requirement, set higher limit and the lower limit of grid-connected point voltage constraint;
The higher limit retrain grid-connected some day operation voltage data with grid-connected point voltage respectively and lower limit compare, and adopt also site unique step Power-injected method to obtain energy storage power output;
By energy storage power output temporally step-length integration obtain the energy storage configuration capacity containing photovoltaic power distribution network.
Containing a stored energy capacitance configuration-system for photovoltaic power distribution network, comprising:
Acquisition module, for gathering Net Frame of Electric Network parameter, in the upper time period, maximum operational mode daily load and photovoltaic plant day gain merit and exert oneself;
Voltage data acquisition module, for according to Net Frame of Electric Network parameter, meritoriously to exert oneself maximum operational mode daily load and photovoltaic plant day in the upper time period, adopts distribution power system load flow calculation, obtains grid-connected some day operation voltage data;
Upper lower limit value setting module, for according to electric power netting safe running requirement, sets higher limit and the lower limit of grid-connected point voltage constraint;
Energy storage power output calculates module, compares for the higher limit that retrained with grid-connected point voltage respectively by grid-connected some day operation voltage data and lower limit, and adopts and site unique step Power-injected method obtains energy storage power output;
Energy storage configuration capacity acquisition module, for by energy storage power output temporally step-length integration obtain the energy storage configuration capacity containing photovoltaic power distribution network.
The present invention contains energy accumulation capacity configuration and the system of photovoltaic power distribution network, gather parameter of double--layer grids, maximum operational mode daily load and photovoltaic plant day gained merit and exert oneself in the upper time period, Load flow calculation obtains each sampling instant grid-connected some day operation voltage data, set the bound of grid-connected point voltage constraint, according to the working voltage of grid-connected point, adopt also site unique step Power-injected method to obtain the energy storage power stage array of each sampled point, and temporally step-length integration obtain energy storage configuration capacity.Whole process is simple, and consider the stored energy capacitance configuration of voltage constraint, carry out energy storage configuration from the angle avoiding grid-connected point voltage out-of-limit, distribu-tion index is intuitively easily surveyed effectively, can be used for the determination of stored energy capacitance and optimizes the stored energy capacitance configuration considering voltage constraint.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that the present invention contains energy accumulation capacity configuration first embodiment of photovoltaic power distribution network;
Fig. 2 is the schematic flow sheet that the present invention contains energy accumulation capacity configuration second embodiment of photovoltaic power distribution network.
Fig. 3 is the simplified model schematic diagram that the present invention contains photovoltaic plant access 10kV power distribution network in one of them application example of energy accumulation capacity configuration of photovoltaic power distribution network;
Fig. 4 is power output and the load power curve chart that the present invention contains photovoltaic plant in one of them application example of energy accumulation capacity configuration of photovoltaic power distribution network;
Fig. 5 is that the present invention contains the day operation voltage curve not configuring each node of energy storage in one of them application example of energy accumulation capacity configuration of photovoltaic power distribution network;
Fig. 6 is the output curve diagram that the present invention contains each moment energy storage power in one of them application example of energy accumulation capacity configuration of photovoltaic power distribution network;
Fig. 7 is by the voltage curve of the present invention containing each node after the energy accumulation capacity configuration configuration energy storage of photovoltaic power distribution network;
Fig. 8 is the structural representation that the present invention contains stored energy capacitance configuration-system first embodiment of photovoltaic power distribution network;
Fig. 9 is the structural representation that the present invention contains stored energy capacitance configuration-system second embodiment of photovoltaic power distribution network.
Embodiment
As shown in Figure 1, a kind of energy accumulation capacity configuration containing photovoltaic power distribution network, comprises step:
S100: gather Net Frame of Electric Network parameter, maximum operational mode daily load and photovoltaic plant day gained merit and exert oneself in the upper time period.
Net Frame of Electric Network parameter, in the upper time period, meritorious these data of exerting oneself can obtain based on electrical network historical data maximum operational mode daily load and photovoltaic plant day.A upper time period is specifically as follows one month, a season or 1 year equal time section.
As shown in Figure 2, wherein in an embodiment, step 100 comprises step:
S120: the sampling time interval △ t determining Dan Tian.
Determine the sampling time interval △ t of a day, then within one day, be total to n sampled point.
S140: gathered Net Frame of Electric Network parameter, the load data of each load point of each sampling instant of maximum operational mode day i and meritorious the exerting oneself of photovoltaic plant on the same day each sampling instant i in a day in the upper time period.
Gather Net Frame of Electric Network line impedance, the load data of each load point of each sampling instant of maximum operational mode day i and the meritorious P that exerts oneself of photovoltaic plant on the same day each sampling instant i in a day in the upper time period
vi.
S200: according to Net Frame of Electric Network parameter, maximum operational mode daily load and photovoltaic plant day gained merit and exert oneself in the upper time period, adopt distribution power system load flow calculation, obtain grid-connected some day operation voltage data.
Net Frame of Electric Network parameter mainly comprises Net Frame of Electric Network line impedance, calls distribution power system load flow calculation program solution each moment grid-connected point voltage U
i, (i=1,2 ... n), one group of day operation voltage array U=(U is obtained
1, U
2..., U
n).To exert oneself P according to photovoltaic plant
vand load data P
l, Q
l, parameter of double--layer grids situation, calls distribution power system load flow calculation program solution and goes out grid-connected point voltage U of each moment
i.
S300: according to electric power netting safe running requirement, sets higher limit and the lower limit of the constraint of grid-connected point voltage.
Electric power netting safe running requires to know based on the relevant industries criterion of power industry, safe operation in different power distribution network requires not identical, such as, in 10kV power distribution network, allows the voltage range deviation run to be ± 7%, from perunit value, working voltage scope is 0.93kV ~ 1.07kV.
S400: the higher limit retrain grid-connected some day operation voltage data with grid-connected point voltage respectively and lower limit compare, and adopt also site unique step Power-injected method to obtain energy storage power output.
By each element U in grid-connected some day operation voltage data U
i(i=1,2 ..., upper limit n) retrained with voltage respectively
and lower limit
urelatively, and adopt also site unique step Power-injected method to obtain energy storage power output, the energy storage power output of i-th sampled point is p
si; The energy storage power output of each sampled point is deposited in an array, claims this array to be p
s.And site unique step Power-injected method refer to photovoltaic and site unique step inject energy storage power, until the method for voltage in restriction range of grid-connected point.
Specifically, wherein in an embodiment, the energy storage power output p of i-th sampled point
siobtain by the following method:
Initialization energy storage power output p
si=0, setting energy storage injecting power step-length △ P
s; If U
i<
u, be △ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage U
i, until grid-connected point voltage is greater than U, p is set
sifor the injecting power of now energy storage; If
be-△ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage, until grid-connected point voltage is less than
p is set
sifor the injecting power of now energy storage; If
p is set
sibe 0.
S500: by energy storage power output temporally step-length integration obtain the energy storage configuration capacity containing photovoltaic power distribution network.
Wherein in an embodiment, step S500 specifically comprises step:
Judge the positive and negative of energy storage output power value;
Be the positive cumulative summation of numerical value by energy storage output power value, record summed result is sum
pos, by energy storage output power value be the negative cumulative summation of numerical value and negate, record summation negate result is sum
neg;
Relatively summed result sum
poswith summation negate result sum
negsize, work as sum
pos>sum
negtime, arranging energy storage configuration capacity is sum
pos* △ t, works as sum
pos≤ sum
negtime, arranging energy storage configuration capacity is sum
neg* △ t.
The present invention is containing the energy accumulation capacity configuration of photovoltaic power distribution network, gather parameter of double--layer grids, maximum operational mode daily load and photovoltaic plant day gained merit and exert oneself in the upper time period, Load flow calculation obtains each sampling instant grid-connected some day operation voltage data, set the bound of grid-connected point voltage constraint, according to the working voltage of grid-connected point, adopt also site unique step Power-injected method to obtain the energy storage power stage array of each sampled point, and temporally step-length integration obtain energy storage configuration capacity.Whole process simple, intuitive, consider the stored energy capacitance configuration of voltage constraint, carry out energy storage configuration from the angle avoiding grid-connected point voltage out-of-limit, distribu-tion index is intuitively easily surveyed effectively, can be used for the determination of stored energy capacitance and optimizes the stored energy capacitance configuration considering voltage constraint.
Wherein in an embodiment, the described higher limit that retrained with grid-connected point voltage respectively by grid-connected some day operation voltage data and lower limit compare, and adopt and site unique step Power-injected method obtains energy storage power output specifically comprises step:
Initialization energy storage power output p
s0=0, setting energy storage injecting power step-length △ P
s;
By grid-connected some day operation voltage U
ithe higher limit retrained with grid-connected point voltage respectively
and lower limit
urelatively;
When grid-connected some day operation voltage U
ibe less than the lower limit of grid-connected point voltage constraint
utime, be △ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage, until grid-connected point voltage is greater than the lower limit of grid-connected point voltage constraint
u, energy storage power output p is set
sifor the injecting power of now energy storage;
When grid-connected some day operation voltage U
ibe greater than the higher limit of grid-connected point voltage constraint
time, be-△ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage, until grid-connected point voltage is less than the higher limit of grid-connected point voltage constraint
energy storage power output p is set
sifor the injecting power of now energy storage;
When grid-connected some day operation voltage U
ibe less than or equal to the higher limit of grid-connected point voltage constraint
and be more than or equal to the lower limit of grid-connected point voltage constraint
utime, energy storage power output p is set
sibe zero.
Below by employing instantiation, and composition graphs 3, Fig. 4, Fig. 5 further explain explanation to the present invention containing the energy accumulation capacity configuration of photovoltaic power distribution network.
Fig. 3 is the simplified model of middle photovoltaic plant access 10kV power distribution network in this specific embodiment, and in figure, 1,2,3,4 represent node serial number respectively.
Step one: the sampling time interval △ t=15min determining a day, be then total to n=96 sampled point in one day;
Step 2: collection Net Frame of Electric Network line impedance, the load data of each load point of each sampling instant of maximum operational mode day i and the meritorious P that exerts oneself of photovoltaic plant on the same day each sampling instant i in a day in the upper time period
vi;
Line impedance Z between node 1 to node 2
12, line impedance Z between node 2 to node 3
23, system equivalent reactance X
0, because susceptance is very little over the ground in 10kV power distribution network, therefore ignore line-to-ground susceptance.Above parameter is respectively:
Z
12＝(0.63+j1.2)Ω，Z
23＝(1.26+j2.4)Ω，X
0＝j0.6Ω
Infinite bus system node voltage perunit value is: V
4=1.05
The load data of each load point of each sampling instant of maximum operational mode day i and the meritorious P that exerts oneself of photovoltaic plant on the same day each sampling instant i in a day in the upper time period
vias shown in Figure 4, photovoltaic plant runs with unit power, i.e. Q
v=0, Fig. 4 shows the P that exerts oneself of the photovoltaic plant that each sampling instant is formed
vand load is gained merit P
lidle Q
lcurve.
Step 3: call distribution power system load flow calculation program solution each moment grid-connected point voltage U
i(i=1,2 ... n), one group of day operation voltage array U=(U is obtained
1, U
2..., U
n); To exert oneself P according to photovoltaic plant
vand load data P
l, Q
l, parameter of double--layer grids situation, calls distribution power system load flow calculation program solution and goes out grid-connected point voltage U of each moment
i, for more getting information about the voltage condition of different node in example, Fig. 5 gives the voltage curve that the day operation voltage array that each moment is formed is linked to be of each node in example.
Step 4: the bound requiring the grid-connected point voltage constraint of setting according to safe operation:
u;
In 10kV power distribution network, allow the voltage range deviation run to be ± 7%, from perunit value, working voltage scope is 0.93kV ~ 1.07kV.Consider certain nargin, setting
u=0.95, namely grid-connected point voltage is constrained between 0.95kV ~ 1.06kV.
Step 5: by and site day operation voltage array U in each element U
i(i=1,2 ... n) upper limit retrained with voltage respectively
and lower limit
urelatively, and adopt also site unique step Power-injected method to obtain energy storage power output, the energy storage power output of i-th sampled point is p
si; The energy storage power output of each sampled point is deposited in an array, claims this array to be p
s.
The energy storage power output p of i-th sampled point
siobtain by the following method:
Initialization energy storage power output p
s0=0, setting energy storage injecting power step-length △ P
s; If U
i<
u, be △ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage U
i, until grid-connected point voltage is greater than U, p is set
sifor the injecting power of now energy storage; If
be-△ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage, until grid-connected point voltage is less than
p is set
sifor the injecting power of now energy storage; If
p is set
sibe 0.In this specific embodiment, there is the more upper limit and more lower limit situation in grid-connected point voltage, finds the moment that grid-connected some U get over the upper limit to be: this time period of 11:00 ~ 14:45, more the moment of lower limit is: this time period of 18:00 ~ 23:00.From day operation voltage array U, be 44th ~ 59 elements and occurred the more upper limit, there is more lower limit in 72nd ~ 92 elements, the upper limit is got in totally 16 sampling instants, and lower limit is got in 21 sampling instants, setting △ P
s=0.05MW; If Ui<U, be △ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage U
i, until grid-connected point voltage is greater than U, the injecting power that Psi is now energy storage is set; If
at grid-connected point with step-length for-Δ Ps progressively injects energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage, until grid-connected point voltage is less than
p is set
sifor the injecting power of now energy storage; If
p is set
sibe 0; Fig. 6 shows the curve of output of each moment energy storage power, p
si>0 represents that energy storage is in discharge condition, p
si<0 represents that energy storage is in charged state.
Step 6: to p
sielement carries out suing for peace, integration obtains energy storage configuration capacity.
To p
selement carries out suing for peace, integration obtains energy storage configuration capacity, energy storage configuration capacity is determined by the following method: judge the positive and negative of energy storage output power value, and be the positive cumulative summation of numerical value by energy storage output power value, record summed result is sum
pos, by energy storage output power value be the negative cumulative summation of numerical value and negate, record summation negate result is sum
neg, compare summed result sum
poswith summation negate result sum
negsize, work as sum
pos>sum
negtime, arranging energy storage configuration capacity is sum
pos* △ t, works as sum
pos≤ sum
negtime, arranging energy storage configuration capacity is sum
neg* △ t.
In this specific embodiment, p
sin all elements totally 21 being greater than 0, p
sin all elements totally 16 being less than 0; To p
sin all be greater than 0 element summation, summed result sum
posrepresent; Then: sum
pos=33; To p
sin all be less than 0 element summation and negate, summation, negate result sum
negrepresent; Then: sum
neg=41.05;
Because sum
neg<sum
neg, △ t=15min=0.25h, then the stored energy capacitance configured is:
C＝sum
neg*△t＝41.05MW*0.25h＝10.2625MWgh
Therefore, in this specific embodiment, the configuration capacity C=10.2625MWgh of energy storage.
For visual test adopts the present invention to contain the effect after the energy accumulation capacity configuration of photovoltaic power distribution network, Fig. 7 gives and adopts the present invention containing after the energy accumulation capacity configuration configuration energy storage of photovoltaic power distribution network, the day operation voltage curve of each node.
As shown in Figure 7, the voltage of node 1, namely the voltage of grid-connected point is constrained between 0.96kV ~ 1.06kV accurately, and this proves accuracy and the validity of the energy storage power output that the method is calculated.In Figure 5, the node 1 at grid-connected some place, node 2 voltage at load place have occurred all having occurred more bound, and after adopting the present invention to contain the energy accumulation capacity configuration configuration energy storage of photovoltaic power distribution network, node 1,
Node 2 all there will not be out-of-limit.Visible, adopt the present invention to configure containing the energy accumulation capacity configuration of photovoltaic power distribution network the problem that energy storage effectively can solve the local nodes voltage out-of-limit caused after photovoltaic accesses.
Wherein in an embodiment, described by energy storage power output temporally step-length integration after obtaining containing photovoltaic power distribution network energy storage configuration capacity also in steps:
Energy storage configuration capacity data containing photovoltaic power distribution network are stored.
Storing calculating the energy storage configuration capacity data containing photovoltaic power distribution network obtained, avoiding fortuitous event to cause loss of data on the one hand, also convenient operation personnel are follow-up again on the other hand checks.
As shown in Figure 8, a kind of stored energy capacitance configuration-system containing photovoltaic power distribution network, comprising:
Acquisition module 100, for gathering Net Frame of Electric Network parameter, in the upper time period, maximum operational mode daily load and photovoltaic plant day gain merit and exert oneself;
Voltage data acquisition module 200, for according to Net Frame of Electric Network parameter, meritoriously to exert oneself maximum operational mode daily load and photovoltaic plant day in the upper time period, adopts distribution power system load flow calculation, obtains grid-connected some day operation voltage data;
Upper lower limit value setting module 300, for according to electric power netting safe running requirement, sets higher limit and the lower limit of grid-connected point voltage constraint;
Energy storage power output calculates module 400, compares for the higher limit that retrained with grid-connected point voltage respectively by grid-connected some day operation voltage data and lower limit, and adopts and site unique step Power-injected method obtains energy storage power output;
Energy storage configuration capacity acquisition module 500, for by energy storage power output temporally step-length integration obtain the energy storage configuration capacity containing photovoltaic power distribution network.
The present invention is containing the stored energy capacitance configuration-system of photovoltaic power distribution network, acquisition module 100 gathers parameter of double--layer grids, in the upper time period, maximum operational mode daily load and photovoltaic plant day gain merit and exert oneself, voltage data acquisition module 200 Load flow calculation obtains each sampling instant grid-connected some day operation voltage data, upper lower limit value setting module 300 sets the bound of grid-connected point voltage constraint, energy storage power output calculates module 400 according to the working voltage of grid-connected point, also site unique step Power-injected method is adopted to obtain the energy storage power stage array of each sampled point, energy storage configuration capacity acquisition module 500 temporally step-length integration obtains energy storage configuration capacity.Whole process simple, intuitive, consider the stored energy capacitance configuration of voltage constraint, carry out energy storage configuration from the angle avoiding grid-connected point voltage out-of-limit, distribu-tion index is intuitively easily surveyed effectively, can be used for the determination of stored energy capacitance and optimizes the stored energy capacitance configuration considering voltage constraint.
As shown in Figure 9, wherein in an embodiment, described acquisition module 100 specifically comprises:
Sampling interval determining unit 120, for determining the sampling time interval △ t of Dan Tian;
Collecting unit 140, the load data of each load point of each sampling instant of maximum operational mode day i and meritorious the exerting oneself of photovoltaic plant on the same day each sampling instant i in a day for gathering Net Frame of Electric Network parameter, in the upper time period.
Wherein in an embodiment, described energy storage power output calculates module 400 and specifically comprises:
Initial cell, for initialization energy storage power output p
s0=0, setting energy storage injecting power step-length △ P
s;
Comparing unit, for by grid-connected some day operation voltage U
ithe higher limit retrained with grid-connected point voltage respectively
and lower limit
urelatively;
First processing unit, for working as grid-connected some day operation voltage U
ibe less than the lower limit of grid-connected point voltage constraint
utime, be △ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage, until grid-connected point voltage is greater than the lower limit of grid-connected point voltage constraint
u, energy storage power output p is set
sifor the injecting power of now energy storage;
Second processing unit, for working as grid-connected some day operation voltage U
ibe greater than the higher limit of grid-connected point voltage constraint
time, be-△ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage, until grid-connected point voltage is less than the higher limit of grid-connected point voltage constraint
energy storage power output p is set
sifor the injecting power of now energy storage;
3rd processing unit, for working as grid-connected some day operation voltage U
ibe less than or equal to the higher limit of grid-connected point voltage constraint
and be more than or equal to the lower limit of grid-connected point voltage constraint
utime, energy storage power output p is set
sibe zero.
Wherein in an embodiment, described energy storage configuration capacity acquisition module 500 specifically comprises:
Judging unit, for judging the positive and negative of energy storage output power value;
Energy storage configuration capacity computing unit, for being the positive cumulative summation of numerical value by energy storage output power value, record summed result is sum
pos, by energy storage output power value be the negative cumulative summation of numerical value and negate, record summation negate result is sum
neg;
Energy storage configuration capacity acquiring unit, for comparing summed result sum
poswith summation negate result sum
negsize, work as sum
pos>sum
negtime, arranging energy storage configuration capacity is sum
pos* △ t, works as sum
pos≤ sum
negtime, arranging energy storage configuration capacity is sum
neg* △ t.
Wherein in an embodiment, the described stored energy capacitance configuration-system containing photovoltaic power distribution network also comprises:
Memory module, for storing the energy storage configuration capacity data containing photovoltaic power distribution network.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1., containing an energy accumulation capacity configuration for photovoltaic power distribution network, it is characterized in that, comprise step:
Gather Net Frame of Electric Network parameter, maximum operational mode daily load and photovoltaic plant day gained merit and exert oneself in the upper time period;
According to Net Frame of Electric Network parameter, maximum operational mode daily load and photovoltaic plant day gained merit and exert oneself in the upper time period, adopt distribution power system load flow calculation, obtain grid-connected some day operation voltage data;
According to electric power netting safe running requirement, set higher limit and the lower limit of grid-connected point voltage constraint;
The higher limit retrain grid-connected some day operation voltage data with grid-connected point voltage respectively and lower limit compare, and adopt also site unique step Power-injected method to obtain energy storage power output;
By energy storage power output temporally step-length integration obtain the energy storage configuration capacity containing photovoltaic power distribution network.
2. the energy accumulation capacity configuration containing photovoltaic power distribution network according to claim 1, is characterized in that, described collection Net Frame of Electric Network parameter, maximum operational mode daily load and photovoltaic plant day gains merit to exert oneself and specifically comprises step in the upper time period:
Determine the sampling time interval △ t of Dan Tian;
Gathered Net Frame of Electric Network parameter, the load data of each load point of each sampling instant of maximum operational mode day i and meritorious the exerting oneself of photovoltaic plant on the same day each sampling instant i in a day in the upper time period.
3. the energy accumulation capacity configuration containing photovoltaic power distribution network according to claim 1 and 2, it is characterized in that, the described higher limit that retrained with grid-connected point voltage respectively by grid-connected some day operation voltage data and lower limit compare, and adopt and site unique step Power-injected method obtains energy storage power output specifically comprises step:
Initialization energy storage power output p
s0=0, setting energy storage injecting power step-length △ P
s;
By grid-connected some day operation voltage U
ithe higher limit retrained with grid-connected point voltage respectively
and lower limit
urelatively;
When grid-connected some day operation voltage U
ibe less than the lower limit of grid-connected point voltage constraint
utime, be △ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage, until grid-connected point voltage is greater than the lower limit of grid-connected point voltage constraint
u, energy storage power output p is set
sifor the injecting power of now energy storage;
When grid-connected some day operation voltage U
ibe greater than the higher limit of grid-connected point voltage constraint
time, be-△ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage, until grid-connected point voltage is less than the higher limit of grid-connected point voltage constraint
energy storage power output p is set
sifor the injecting power of now energy storage;
When grid-connected some day operation voltage U
ibe less than or equal to the higher limit of grid-connected point voltage constraint
and be more than or equal to the lower limit of grid-connected point voltage constraint
utime, energy storage power output p is set
sibe zero.
4. the energy accumulation capacity configuration containing photovoltaic power distribution network according to claim 2, is characterized in that, described by energy storage power output temporally step-length integration obtain specifically comprising step containing the energy storage configuration capacity of photovoltaic power distribution network:
Judge the positive and negative of energy storage output power value;
Be the positive cumulative summation of numerical value by energy storage output power value, record summed result is sum
pos, by energy storage output power value be the negative cumulative summation of numerical value and negate, record summation negate result is sum
neg;
Relatively summed result sum
poswith summation negate result sum
negsize, work as sum
pos>sum
negtime, arranging energy storage configuration capacity is sum
pos* △ t, works as sum
pos≤ sum
negtime, arranging energy storage configuration capacity is sum
neg* △ t.
5. the energy accumulation capacity configuration containing photovoltaic power distribution network according to claim 1 and 2, is characterized in that, described by energy storage power output temporally step-length integration after obtaining containing photovoltaic power distribution network energy storage configuration capacity also in steps:
Energy storage configuration capacity data containing photovoltaic power distribution network are stored.
6., containing a stored energy capacitance configuration-system for photovoltaic power distribution network, it is characterized in that, comprising:
Acquisition module, for gathering Net Frame of Electric Network parameter, in the upper time period, maximum operational mode daily load and photovoltaic plant day gain merit and exert oneself;
Voltage data acquisition module, for according to Net Frame of Electric Network parameter, meritoriously to exert oneself maximum operational mode daily load and photovoltaic plant day in the upper time period, adopts distribution power system load flow calculation, obtains grid-connected some day operation voltage data;
Upper lower limit value setting module, for according to electric power netting safe running requirement, sets higher limit and the lower limit of grid-connected point voltage constraint;
Energy storage power output calculates module, compares for the higher limit that retrained with grid-connected point voltage respectively by grid-connected some day operation voltage data and lower limit, and adopts and site unique step Power-injected method obtains energy storage power output;
Energy storage configuration capacity acquisition module, for by energy storage power output temporally step-length integration obtain the energy storage configuration capacity containing photovoltaic power distribution network.
7. the stored energy capacitance configuration-system containing photovoltaic power distribution network according to claim 6, it is characterized in that, described acquisition module specifically comprises:
Sampling interval determining unit, for determining the sampling time interval △ t of Dan Tian;
Collecting unit, the load data of each load point of each sampling instant of maximum operational mode day i and meritorious the exerting oneself of photovoltaic plant on the same day each sampling instant i in a day for gathering Net Frame of Electric Network parameter, in the upper time period.
8. the stored energy capacitance configuration-system containing photovoltaic power distribution network according to claim 6 or 7, is characterized in that, described energy storage power output calculates module and specifically comprises:
Initial cell, for initialization energy storage power output p
s0=0, setting energy storage injecting power step-length △ P
s;
Comparing unit, for by grid-connected some day operation voltage U
ithe higher limit retrained with grid-connected point voltage respectively
and lower limit
urelatively;
First processing unit, for working as grid-connected some day operation voltage U
iwhen being less than the lower limit U of grid-connected point voltage constraint, be △ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage, until grid-connected point voltage is greater than the lower limit of grid-connected point voltage constraint
u, energy storage power output p is set
sifor the injecting power of now energy storage;
Second processing unit, for working as grid-connected some day operation voltage U
ibe greater than the higher limit of grid-connected point voltage constraint
time, be-△ P at grid-connected point with step-length
sprogressively inject energy storage power, often inject a power and carry out primary distribution Load flow calculation, solve grid-connected point voltage, until grid-connected point voltage is less than the higher limit of grid-connected point voltage constraint
energy storage power output p is set
sifor the injecting power of now energy storage;
3rd processing unit, for working as grid-connected some day operation voltage U
ibe less than or equal to the higher limit of grid-connected point voltage constraint
and be more than or equal to the lower limit of grid-connected point voltage constraint
utime, energy storage power output p is set
sibe zero.
9. the stored energy capacitance configuration-system containing photovoltaic power distribution network according to claim 7, it is characterized in that, described energy storage configuration capacity acquisition module specifically comprises:
Judging unit, for judging the positive and negative of energy storage output power value;
Energy storage configuration capacity computing unit, for being the positive cumulative summation of numerical value by energy storage output power value, record summed result is sum
pos, by energy storage output power value be the negative cumulative summation of numerical value and negate, record summation negate result is sum
neg;
Energy storage configuration capacity acquiring unit, for comparing summed result sum
poswith summation negate result sum
negsize, work as sum
pos>sum
negtime, arranging energy storage configuration capacity is sum
pos* △ t, works as sum
pos≤ sum
negtime, arranging energy storage configuration capacity is sum
neg* △ t.
10. the stored energy capacitance configuration-system containing photovoltaic power distribution network according to claim 1 and 2, is characterized in that, also comprise:
Memory module, for storing the energy storage configuration capacity data containing photovoltaic power distribution network.
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| CN110556857A (en) * | 2019-06-10 | 2019-12-10 | 国网甘肃省电力公司定西供电公司 | distributed photovoltaic grid-connected point voltage calculation method based on current collection network model |
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Effective date of registration: 20231215 Address after: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Patentee after: SOUTH CHINA University OF TECHNOLOGY Address before: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. Patentee before: SOUTH CHINA University OF TECHNOLOGY |