CN115514101A - Power distribution method and device for energy storage power station - Google Patents
Power distribution method and device for energy storage power station Download PDFInfo
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J15/00—Systems for storing electric energy
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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Abstract
The application discloses a power distribution method and device for an energy storage power station. The method comprises the following steps: acquiring grid-connected point frequency and total power of an energy storage power station, wherein the total power at least comprises total active power and total reactive power of the energy storage power station, and the energy storage power station comprises at least two energy storage converters; carrying out frequency modulation on the total active power according to the grid-connected point frequency to obtain target active power, and carrying out reactive power voltage regulation on the total reactive power according to a preset voltage difference regulation coefficient to obtain target reactive power; acquiring the current residual electric quantity of each energy storage converter in the energy storage power station; determining a weight value corresponding to each energy storage converter according to the current residual electric quantity, wherein the weight value represents the distribution proportion of each energy storage converter in the power distribution process; and distributing the target active power and the target reactive power to at least two energy storage converters according to the weight value corresponding to each energy storage converter. Through the application, the problem of low power distribution efficiency of the energy storage power station in the related art is solved.
Description
Technical Field
The application relates to the field of power processing, in particular to a power distribution method and device for an energy storage power station.
Background
The large-scale development and utilization of new energy such as wind power, solar energy and the like are effective ways for realizing sustainable development, optimizing energy structure and improving environment quality. However, the volatility and intermittency of new energy power generation are still main factors restricting the large-scale application of the new energy power generation. Wherein, install the energy storage power station in order to stabilize its power fluctuation at new forms of energy power generation power outlet side, can turn into the power that can dispatch with new forms of energy power generation power to help reducing the impact of the volatility of new forms of energy electricity generation to electric power system.
In recent years, with the construction and development of large-scale energy storage power stations, tens of megawatts or even larger-scale energy storage power stations appear. The number of energy storage converters (PCS) of these energy storage power stations usually reaches several tens or even several hundreds. The problem of how to reasonably distribute the power of the energy storage power station is solved by simultaneously arranging a plurality of battery packs and PCS in the same power station.
In the prior art, the power of the energy storage power station is generally distributed to each PCS in an average distribution manner, but this distribution manner may cause PCS in need of supplementing electricity urgently to be distributed to lower power, and PCS in sufficient electricity to be distributed to higher power, so that the problem of unreasonable power distribution and low distribution efficiency of the energy storage power station is caused.
In view of the above problems in the related art, no effective solution has been proposed at present.
Disclosure of Invention
The application mainly aims to provide a power distribution method of an energy storage power station, so as to solve the problem that the power distribution efficiency of the energy storage power station in the related art is low.
In order to achieve the above object, according to one aspect of the present application, there is provided a power distribution method of an energy storage power station. The method comprises the following steps: acquiring grid-connected point frequency and total power of an energy storage power station, wherein the total power at least comprises total active power and total reactive power of the energy storage power station, and the energy storage power station comprises at least two energy storage converters; carrying out frequency modulation on the total active power according to the grid-connected point frequency to obtain target active power, and carrying out reactive power voltage regulation on the total reactive power according to a preset voltage difference regulation coefficient to obtain target reactive power; acquiring the current residual electric quantity of each energy storage converter in the energy storage power station; determining a weight value corresponding to each energy storage converter according to the current residual electric quantity, wherein the weight value represents the distribution proportion of each energy storage converter in the power distribution process; and distributing the target active power and the target reactive power to at least two energy storage converters according to the weight value corresponding to each energy storage converter.
Further, the power distribution method of the energy storage power station further comprises the following steps: collecting three-phase voltage of an energy storage power station at a grid connection point; determining the positive sequence voltage of a grid connection point according to the three-phase voltage; determining a plurality of frequency variations of the grid-connected point in a cycle according to the positive sequence voltage and the rated power of the grid-connected point; calculating the average value of the multiple frequency variation quantities to obtain the target frequency variation quantity of the grid-connected point; and determining the grid-connected point frequency according to the target frequency variation and the rated power.
Further, the power distribution method of the energy storage power station further comprises the following steps: collecting the total branch voltage and the total branch current of the energy storage power station; determining three target phase voltages corresponding to the total branch circuit voltage and three target phase currents corresponding to the total branch circuit current according to a root mean square algorithm, wherein each target phase current corresponds to one target phase voltage; determining a first phase voltage corresponding to each target phase voltage before a cycle and a first phase current corresponding to the first phase voltage; determining a second phase current corresponding to each target phase current before 3/4 cycle; determining a third phase current corresponding to each target phase current before 7/4 cycle; and determining total active power and total reactive power of the energy storage power station according to the target phase voltage, the target phase current and other power data, wherein the other power data comprise a first phase voltage, a first phase current, a second phase current and a third phase current.
Further, the power distribution method of the energy storage power station further comprises the following steps: detecting the frequency magnitude relation between the grid-connected point frequency and a preset minimum frequency and a preset maximum frequency; determining a target active power increment according to the frequency magnitude relation; and summing the total active power and the target active power increment to obtain the target active power.
Further, the power distribution method of the energy storage power station further comprises the following steps: when the grid-connected point frequency is less than or equal to a preset maximum frequency and the grid-connected point frequency is greater than or equal to a preset minimum frequency, determining that the target active power increment is 0; when the grid-connected point frequency is greater than a preset maximum frequency, determining a target active power increment according to a preset frequency modulation difference adjustment coefficient, the preset maximum frequency and the grid-connected point frequency; and when the grid-connected point frequency is smaller than the preset minimum frequency, determining the target active power increment according to the frequency modulation difference adjustment coefficient, the preset minimum frequency and the grid-connected point frequency.
Further, the power distribution method of the energy storage power station further comprises the following steps: detecting the voltage magnitude relation between the total branch voltage and a preset minimum voltage and a preset maximum voltage; determining a target reactive power increment according to the voltage magnitude relation; and summing the total reactive power and the target reactive power increment to obtain the target reactive power.
Further, the power distribution method of the energy storage power station further comprises the following steps: when the total branch voltage is less than or equal to a preset maximum voltage and the total branch voltage is greater than or equal to a preset minimum voltage, determining that the target reactive power increment is 0; when the total branch voltage is greater than the preset maximum voltage, determining a target reactive power increment according to the voltage difference adjustment coefficient, the preset maximum voltage and the total branch voltage; and when the total branch voltage is less than the preset minimum voltage, determining a target reactive power increment according to the voltage difference adjustment coefficient, the preset minimum voltage and the total branch voltage.
Further, the power distribution method of the energy storage power station further comprises the following steps: detecting whether the target power is a negative number, wherein the target power is target active power or target reactive power; when the target power is negative, detecting whether the current residual capacity is smaller than a preset maximum residual capacity; determining a weight value according to the maximum remaining power and the current remaining power under the condition that the current remaining power is less than the maximum remaining power; determining the weight value to be 0 under the condition that the current residual capacity is greater than or equal to the maximum residual capacity; when the target power is a non-negative number, detecting whether the current residual capacity is greater than a preset minimum residual capacity; determining a weight value according to the minimum remaining capacity and the current remaining capacity under the condition that the current remaining capacity is greater than the minimum remaining capacity; and determining the weight value to be 0 under the condition that the current residual capacity is less than or equal to the minimum residual capacity.
Further, the above weight value is determined by the following formula:
wherein w soci The weighted value is corresponding to the ith energy storage converter in the at least two energy storage converters; soc i The current residual electric quantity of the ith energy storage converter is obtained; soc L Is the minimum remaining capacity; soc H The maximum remaining capacity; n is the number of the energy storage converters, and X is the target power.
In order to achieve the above object, according to another aspect of the present application, there is provided a power distribution apparatus of an energy storage power station. The device includes: the system comprises a first acquisition module, a second acquisition module and a third acquisition module, wherein the first acquisition module is used for acquiring grid-connected point frequency and total power of an energy storage power station, the total power at least comprises total active power and total reactive power of the energy storage power station, and the energy storage power station comprises at least two energy storage converters; the power processing module is used for carrying out frequency modulation on the total active power according to the grid-connected point frequency to obtain target active power, and carrying out reactive power voltage regulation on the total reactive power according to a preset voltage difference regulating coefficient to obtain target reactive power; the second acquisition module is used for acquiring the current residual electric quantity of each energy storage converter in the energy storage power station; the determining module is used for determining a weight value corresponding to each energy storage converter according to the current residual electric quantity, wherein the weight value represents the distribution proportion of each energy storage converter in the power distribution process; and the power distribution module is used for distributing the target active power and the target reactive power to the at least two energy storage converters according to the weight value corresponding to each energy storage converter.
In the method, the grid-connected point frequency and the total power of the energy storage power station are firstly obtained by adopting a mode of determining the weighted value of each energy storage converter according to the current residual electric quantity of each energy storage converter, wherein the total power at least comprises the total active power and the total reactive power of the energy storage power station, and the energy storage power station at least comprises a plurality of energy storage converters. And then, frequency modulation is carried out on the total active power according to the grid-connected point frequency to obtain target active power, reactive power voltage regulation is carried out on the total reactive power according to a preset voltage difference regulation coefficient to obtain target reactive power, then the current residual electric quantity of each energy storage converter in the energy storage power station is obtained, the corresponding weight value of each energy storage converter is determined according to the current residual electric quantity, and finally, the target active power and the target reactive power are distributed to the plurality of energy storage converters according to the corresponding weight value of each energy storage converter. The weight value represents the distribution proportion of each energy storage converter in the power distribution process.
According to the method and the device, the weight value of each energy storage converter is determined according to the current residual electric quantity of each energy storage converter, and corresponding power is distributed to each energy storage converter according to the weight value, so that the reasonability of power distribution is improved, the PCS with urgent need for electric quantity supplement can be distributed to higher power, and the overall distribution efficiency of the power is improved. In addition, the frequency of the total active power is modulated, the total reactive power is regulated, and the total active power and the total reactive power are respectively compensated, so that the accuracy in the power distribution process can be improved, and the power distribution efficiency is further improved.
Therefore, the technical scheme of the application achieves the purpose of distributing power for the energy storage converters based on the current residual electric quantity of the energy storage converters, so that the effect that the current residual electric quantities of the energy storage converters are maintained at similar levels is achieved, and the problem that the power distribution efficiency of the energy storage power station is low in the prior art is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a flow chart of an alternative method of power distribution of an energy storage power plant according to an embodiment of the present application;
FIG. 2 is a flow chart of an alternative frequency modulation method according to an embodiment of the present application;
FIG. 3 is a flow chart of an alternative voltage regulation method according to an embodiment of the present application;
FIG. 4 is a flow chart of an alternative power allocation method according to an embodiment of the present application;
FIG. 5 is a schematic diagram of an alternative power distribution arrangement for an energy storage power plant in accordance with an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be further noted that the relevant information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for presentation, analyzed data, etc.) referred to in the present disclosure are information and data authorized by the user or sufficiently authorized by each party. For example, an interface is provided between the system and the relevant user or organization, before obtaining the relevant information, an obtaining request needs to be sent to the user or organization through the interface, and after receiving the consent information fed back by the user or organization, the relevant information is obtained.
Example 1
The present application is described below with reference to preferred implementation steps, and fig. 1 is a flowchart of an alternative power distribution method for an energy storage power station according to an embodiment of the present application, as shown in fig. 1, where the method includes the following steps:
and S101, acquiring grid-connected point frequency and total power of the energy storage power station.
In step S101, the total power at least includes a total active power and a total reactive power of the energy storage power station, and the energy storage power station includes at least two energy storage converters.
The energy storage converter is an energy storage converter PCS in an effective working state, and the grid-connected point frequency is also called grid frequency of a grid-connected point and can be represented by f. In addition, an energy storage power plant is a system of devices that store, convert, and release electrical energy cyclically via electrochemical cells or electromagnetic energy storage media.
And S102, carrying out frequency modulation on the total active power according to the grid-connected point frequency to obtain a target active power, and carrying out reactive power voltage regulation on the total reactive power according to a preset voltage difference regulating coefficient to obtain a target reactive power.
Optionally, the voltage difference adjustment coefficient may be set in a user-defined manner. Based on the active frequency modulation and reactive voltage regulation principles, when the active power load changes, the frequency will shift, so the frequency modulation of the total active power is needed. In addition, when the reactive power compliance changes, the voltage may drift, thus requiring regulation of the total reactive power.
It should be noted that, this application carries out the frequency modulation through total active power, carries out the pressure regulating to total reactive power, has carried out power compensation to total active power and total reactive power respectively to can improve the accuracy among the power distribution process, and then promote power distribution efficiency.
And step S103, acquiring the current residual electric quantity of each energy storage converter in the energy storage power station.
In step S103, the current remaining capacity is represented by SOC (State Of Charge), also referred to as a State Of Charge Of the battery. It should be noted that when a PCS is in a charging state, the current remaining capacity of the PCS tends to increase, and when a PCS is in a discharging state, the current remaining capacity of the PCS tends to decrease.
And step S104, determining a weight value corresponding to each energy storage converter according to the current residual electric quantity.
In step S104, the weight value represents the distribution ratio of each energy storage converter in the power distribution process. For the ith PCS in the PCS, the weight value corresponding to the ith PCS is the ratio of the difference value of the SOC of the PCS from the SOC upper limit/the SOC lower limit to the sum of the SOC difference values of all the PCS, and the power distribution is carried out according to the weight value corresponding to each SOC, so that the SOC of all the PCS can be maintained at a similar level.
And S105, distributing the target active power and the target reactive power to at least two energy storage converters according to the weight value corresponding to each energy storage converter.
Optionally, the target active power is assumed to be P t Target reactive power of Q t The weighted value corresponding to the ith PCS is W SOCi Then the active power allocated to the PCS is P i ＝P t *w soci The PCS is distributed with reactive power Q i ＝Q t *w soci 。
Based on the contents of steps S101 to S105, in the present application, a manner of determining a weighted value of each energy storage converter according to a current remaining power of each energy storage converter is adopted, and a grid-connection point frequency and a total power of the energy storage power station are first obtained, where the total power at least includes a total active power and a total reactive power of the energy storage power station, and the energy storage power station at least includes a plurality of energy storage converters. And then, frequency modulation is carried out on the total active power according to the grid-connected point frequency to obtain a target active power, reactive power voltage regulation is carried out on the total reactive power according to a preset voltage difference regulating coefficient to obtain a target reactive power, then the current residual capacity of each energy storage converter in the energy storage power station is obtained, the weight value corresponding to each energy storage converter is determined according to the current residual capacity, and finally, the target active power and the target reactive power are distributed to the plurality of energy storage converters according to the weight value corresponding to each energy storage converter. The weighted value represents the distribution proportion of each energy storage converter in the power distribution process.
According to the method and the device, the weight value of each energy storage converter is determined according to the current residual electric quantity of each energy storage converter, and the corresponding power is distributed to each energy storage converter according to the weight values, so that the reasonability of power distribution is improved, the PCS with urgent need for electric quantity supplement can be distributed to higher power, and the overall distribution efficiency of the power is improved. In addition, the frequency modulation is carried out on the total active power, the voltage is regulated on the total reactive power, and the power compensation is respectively carried out on the total active power and the total reactive power, so that the accuracy in the power distribution process can be improved, and the power distribution efficiency is further improved.
Therefore, the technical scheme of the application achieves the purpose of distributing power for the energy storage converters based on the current residual electric quantity of the energy storage converters, so that the effect that the current residual electric quantities of the energy storage converters are maintained at similar levels is achieved, and the problem that the power distribution efficiency of the energy storage power station is low in the prior art is solved.
In an optional embodiment, a power distribution device may be used as an execution main body of the power distribution method in the embodiment of the present application, where the power distribution device first collects three-phase voltages of an energy storage power station at a grid-connected point, determines a positive sequence voltage of the grid-connected point according to the three-phase voltages, and then determines a plurality of frequency variations of the grid-connected point within one cycle according to the positive sequence voltage and a rated power of the grid-connected point. And finally, the power distribution device calculates the average value of the multiple frequency variation quantities to obtain the target frequency variation quantity of the grid-connected point, and determines the grid-connected point frequency according to the target frequency variation quantity and the rated power.
Optionally, the power distribution device is used for distributing the three-phase voltage U acquired at the grid-connected point of the energy storage power station A 、U B 、U C To calculate the grid-connection point frequency f. The specific calculation process is as follows:
first, the power distribution unit passes the three-phase voltage U A 、U B 、U C Calculating the positive sequence voltage of the grid-connected point
The calculation formula is as follows;
wherein, a = -0.5-0.866j
Then, the power distribution device obtains the frequency variation d f The calculation process is as follows; assuming the current positive sequence voltage phasor
With an amplitude of U 1 (ii) a The positive sequence voltage phasor of the half cycle wave front is
The amplitude of the magnetic flux is U' 1 The real part and the imaginary part are U 'respectively' 1x And U' 1y . The corresponding frequency variation d is calculated by the following formula f ：
Wherein: f. of N Is the nominal frequency of the grid-connected point.
Further, there are multiple frequency variations in a cycle, and the power distribution device needs to adjust d within a cycle f Performing smoothing, i.e. for a plurality of d within one cycle f Calculating the average value to obtain the target frequency variation d fav 。
Finally, the power distribution device calculates the grid-connected point frequency f according to the following formula:
wherein, Δ t is the current interrupt interval time, and N is the number of sampling interrupts in one cycle.
In an optional embodiment, the power distribution device further collects a total branch voltage and a total branch current of the energy storage power station, and determines three target phase voltages corresponding to the total branch voltage and three target phase currents corresponding to the total branch current according to a root mean square algorithm, wherein each target phase current corresponds to one target phase voltage. Then, the power distribution device determines a first phase voltage corresponding to each target phase voltage before a cycle and a first phase current corresponding to the first phase voltage; determining a second phase current corresponding to each target phase current before 3/4 cycle; and determining the corresponding third phase current of each target phase current 7/4 cycle ago. Finally, the power distribution device determines the total active power and the total reactive power of the energy storage power station according to the target phase voltage, the target phase current and other power data, wherein the other power data comprise the first phase voltage, the first phase current, the second phase current and the third phase current.
Optionally, the power distribution device obtains a total branch voltage and a total branch current of the total branch of the energy storage power station, and calculates a total active power P of the energy storage power station according to the total branch voltage and the total branch current 0 And total reactive power Q 0 . The specific calculation process is as follows:
first, the power distribution device is atThree target phase voltages U of the energy storage power station are obtained by a root mean square algorithm in each interruption rmsCNA 、U rmsCNB 、U rmsCNC And three target phase currents I rmsCNA 、I rmsCNB 、I rmsCNC . Wherein, U rmsCNA And I rmsCNA Corresponding, U rmsCNB And I rmsCNB Corresponding, U rmsCNC And I rmsCNC And correspondingly. Through U rmsCNA And I rmsCNA The power distribution device can calculate the single-phase active power P A And single-phase reactive power Q A Through U rmsCNB And I rmsCNB The power distribution device can calculate the single-phase active power P B And single-phase reactive power Q B Through U rmsCNC And I rmsCNC The power distribution device can calculate the single-phase active power P C And single-phase reactive power Q C 。
To calculate to obtain single-phase active power P A And single-phase reactive power Q A For example, in obtaining U rmsCNA And I rmsCNA Then, the power distribution device records U separately rmsCNA Root mean square value U 'before one cycle' rmsCNA (i.e., U) rmsCNA Corresponding first phase voltage), I rmsCNA Root mean square value before one cycle I' rmsCNA (i.e. I) rmsCNA The corresponding first phase current); in addition, the power distribution device records U separately rmsCNA Root mean square value U' at 3/4 cycle front rmsCNA 、I rmsCNA Root mean square value I' at 3/4 cycle front rmsCNA (i.e. I) rmsCNA Corresponding second phase current); u shape rmsCNA Root mean square value U' ″ r at 7/4 cycle front msCNA 、I rmsCNA Root mean square value I' "at 7/4 cycle front rmsCNA (i.e. I) rmsCNA The corresponding third phase current).
The power distribution device calculates the single-phase active power P by the following formula A ：
P A ＝U rmsCNA I rmsCNA +U′ rmsCNA I′ rmsCNA -U rmsCNA I″ rmsCNA +U′ rmsCNA I′″ rmsCNA
The single-phase reactive power Q is calculated by the following formula A ：
Q A ＝U rmsCNA I rmsCNA +U′ rmsCNA I′ rmsCNA +U rmsCNA I″ rmsCNA +U′ rmsCNA I′″ rmsCNA
Similarly, the power distribution device can calculate the single-phase active power P B Single phase reactive power Q B Single phase active power P C And single-phase reactive power Q C 。
Finally, the power distribution device calculates the total active power P of the energy storage power station through the following formula 0 ：
P 0 ＝P A +P B +P C
The total reactive power Q of the energy storage power station is calculated by the following formula 0 ：
Q 0 ＝Q A +Q B +Q C
In an alternative embodiment, in order to improve the accuracy of power distribution, the power distribution device needs to frequency modulate the total active power to achieve power compensation of the total active power. Specifically, the power distribution device firstly detects the frequency magnitude relation between the grid-connected point frequency and a preset minimum frequency and a preset maximum frequency, then determines a target active power increment according to the frequency magnitude relation, and sums the total active power and the target active power increment to obtain the target active power.
Optionally, when the grid-connected point frequency is less than or equal to a preset maximum frequency and the grid-connected point frequency is greater than or equal to a preset minimum frequency, the power distribution device determines that the target active power increment is 0; when the grid-connected point frequency is greater than a preset maximum frequency, the power distribution device determines a target active power increment according to a preset frequency modulation difference adjustment coefficient, the preset maximum frequency and the grid-connected point frequency; and when the grid-connected point frequency is smaller than the preset minimum frequency, the power distribution device determines a target active power increment according to the frequency modulation difference adjustment coefficient, the preset minimum frequency and the grid-connected point frequency.
Fig. 2 is a flow chart of an alternative frequency modulation method according to an embodiment of the present application, and as shown in fig. 2, a power distribution device first calls a frequency modulation module, enters a frequency modulation state by putting a pressure plate and a control word into the frequency modulation module, and then when a frequency f of a grid-connected point is smaller than a lower limit f of a frequency modulation dead zone L (corresponding to the preset minimum frequency), according to the delta% of the frequency modulation difference adjustment coefficient and the preset minimum frequency f L Determining a target active power increment delta P by the grid-connected point frequency f; when the frequency f of the grid-connected point is larger than the lower limit f of the frequency modulation dead zone H (corresponding to the preset maximum frequency), according to the preset frequency modulation difference adjustment coefficient delta% and the preset maximum frequency f H Determining a target active power increment delta P by the grid-connected point frequency f; at f L ≤f≤f H And determining that the target active power increment delta P is 0.
Specifically, the calculation formula of the target active power increment Δ P is as follows:
wherein, delta% in the above formula is the preset frequency modulation difference adjustment coefficient f N Rated frequency, P, for grid-connected point e Rated power, f, for energy-storage power stations H Upper limit of frequency modulation dead zone, f L Is the lower limit of the frequency modulation dead zone. f. of L And f H The settings can be customized.
Finally, the target active power P is calculated according to the following formula t ：
P t ＝P 0 +ΔP
In an optional embodiment, in order to improve the accuracy of power distribution, the power distribution apparatus further needs to regulate the total reactive power to implement power compensation on the total reactive power. Specifically, the power distribution device firstly detects the voltage magnitude relation between the total branch voltage and a preset minimum voltage and a preset maximum voltage, then determines a target reactive power increment according to the voltage magnitude relation, and sums the total reactive power and the target reactive power increment to obtain the target reactive power.
Optionally, when the total branch voltage is less than or equal to a preset maximum voltage and the total branch voltage is greater than or equal to a preset minimum voltage, the power distribution device determines that the target reactive power increment is 0; when the total branch voltage is greater than the preset maximum voltage, the power distribution device determines a target reactive power increment according to the voltage difference adjustment coefficient, the preset maximum voltage and the total branch voltage; and when the total branch voltage is less than the preset minimum voltage, the power distribution device determines a target reactive power increment according to the voltage difference adjustment coefficient, the preset minimum voltage and the total branch voltage.
Fig. 3 is a flowchart illustrating an optional voltage regulation method according to an embodiment of the present application, and as shown in fig. 3, the power distribution apparatus first calls the frequency modulation module, enters a voltage regulation state by putting a pressure plate and a control word into the frequency modulation module, and then when the total branch voltage U is smaller than the lower limit U of the voltage regulation dead zone L (corresponding to the preset minimum voltage), according to the voltage difference adjustment coefficient K and the preset minimum voltage U L Determining a target reactive power increment delta Q by the total branch voltage U; when the total branch voltage U is greater than the upper limit U of the voltage regulation dead zone H (corresponding to the preset maximum voltage), according to the voltage difference adjustment coefficient K and the preset minimum voltage U L Determining a target reactive power increment delta Q by the total branch voltage U; at U L ≤U≤U H Then, the target reactive power increment Δ Q is determined to be 0.
Specifically, the calculation formula of the target reactive power increment Δ Q is as follows:
wherein K in the formula is a preset voltage difference adjustment coefficient and U L For regulating the lower limit and U of the dead zone H Is the upper limit of the frequency modulation dead zone. U shape H And U L Can be set by self.
Finally, the target active power Q is calculated according to the following formula t ：
Q t ＝Q 0 +ΔQ
In an alternative embodiment, the power distribution device can distribute power to each PCS in two distribution manners, one is distribution according to the current remaining capacity of the PCS, and the other is distribution in an average manner. Specifically, when power is distributed in the first manner, the power distribution apparatus first detects whether a target power is a negative number, where the target power is a target active power or a target reactive power. Then, when the target power is negative, the power distribution device detects whether the current residual capacity is smaller than a preset maximum residual capacity, and under the condition that the current residual capacity is smaller than the maximum residual capacity, the power distribution device determines a weight value according to the maximum residual capacity and the current residual capacity; in the case where the current remaining capacity is greater than or equal to the maximum remaining capacity, the power distribution device determines that the weight value is 0.
In addition, when the target power is a non-negative number, the power distribution device detects whether the current remaining power is greater than a preset minimum remaining power, determines a weight value according to the minimum remaining power and the current remaining power when the current remaining power is greater than the minimum remaining power, and determines the weight value to be 0 when the current remaining power is less than or equal to the minimum remaining power.
Optionally, fig. 4 shows a flowchart of an optional power distribution method according to an embodiment of the present application, as shown in fig. 4, the power distribution device obtains a target power by calling the power distribution module, then when the target power is a negative number (at this time, the PCS is in a charging state), traverses the current state of each PCS, and calculates the number of the PCS and a weight value of each PCS in the charging state, if the selected distribution manner is a manner of distributing power according to the SOC, the power distribution device distributes power to each PCS according to the weight value corresponding to each PCS, and the PCS in the power reduction operation state does not distribute power. At the time of secondary allocation, if there is remaining unallocated power, the PCS in the power down operation state is allocated.
In addition, if the target power is a non-negative number (at this time, the PCS is in a discharging state), the power distribution device calculates the number of the PCS and the weight value of each PCS in the discharging state after traversing the current state of each PCS, and if the distribution mode selected at this time is a mode of distributing power according to the SOC, the power distribution device still distributes power to each PCS according to the weight value corresponding to each PCS, and similarly, in the first distribution process, power is not distributed to the PCS in the power reduction operation state. At the time of secondary allocation, if there is remaining unallocated power, the PCS in the power down operation state is allocated.
In an alternative embodiment, fig. 4 further shows an average distribution manner, when the distribution manner is adopted, the power distribution apparatus first determines the number of the plurality of energy storage converters, then calculates a ratio of the target active power to the number to obtain active power corresponding to each energy storage converter, and calculates a ratio of the target reactive power to the number to obtain reactive power corresponding to each energy storage converter.
Alternatively, as shown in fig. 4, the power distribution means may equally distribute power to each PCS regardless of whether the target power is a negative number or a non-negative number, wherein the PCS in the power-down operation state does not distribute power, and during the second distribution, if there is remaining unallocated power, the PCS in the power-down operation state is distributed.
The weight value corresponding to the ith PCS can be calculated by the following formula:
wherein, w soci The weight value corresponding to the ith energy storage converter in at least two energy storage converters (PCS); soc i The current residual capacity (SOC) of the ith energy storage converter is obtained; soc L The minimum remaining capacity is also called SOC lower limit value; soc H The maximum remaining capacity is also called an SOC upper limit value; n is the number of energy storage converters in the energy storage power station, and X is the target power.
It should be noted that the target power X is the target active power P t Or target reactive power Q t 。
The target power X is the target active powerPower P t In the process, the active power calculation method allocated to each PCS is as follows:
taking target power X as target reactive power Q t In time, the reactive power calculation method distributed by each PCS is as follows:
wherein, P i Active power, Q, allocated to the ith PCS i The reactive power allocated to the ith PCS.
According to the method and the device, the weighted value of each energy storage converter can be determined according to the current residual electric quantity of each energy storage converter, the corresponding power can be distributed to each energy storage converter according to the weighted value, the power of the energy storage power station can be distributed to each energy storage converter in an average distribution mode, the reasonability of power distribution is improved, the PCS (power distribution system) for supplementing the emergency electricity demand can be distributed to higher power, and the overall distribution efficiency of the power is improved.
Example 2
The embodiment of the present application further provides a power distribution device of an energy storage power station, and it should be noted that the power distribution device of the energy storage power station in the embodiment of the present application may be used to execute the power distribution method of the energy storage power station provided in embodiment 1 of the present application. The following describes a power distribution device of an energy storage power station provided in an embodiment of the present application.
FIG. 5 is a schematic diagram of an alternative power distribution arrangement for an energy storage power plant in accordance with an embodiment of the present application. As shown in fig. 5, the apparatus includes: the first obtaining module 501 is configured to obtain grid-connected point frequency and total power of an energy storage power station, where the total power at least includes total active power and total reactive power of the energy storage power station, and the energy storage power station includes at least two energy storage converters; the power processing module 502 is configured to perform frequency modulation on the total active power according to the grid-connected point frequency to obtain a target active power, and perform reactive power voltage regulation on the total reactive power according to a preset voltage difference regulation coefficient to obtain a target reactive power; a second obtaining module 503, configured to obtain a current remaining electric quantity of each energy storage converter in the energy storage power station; a determining module 504, configured to determine a weight value corresponding to each energy storage converter according to the current remaining electric quantity, where the weight value represents a distribution ratio of each energy storage converter in a power distribution process; and a power distribution module 505, configured to distribute the target active power and the target reactive power to the at least two energy storage converters according to the weight value corresponding to each energy storage converter.
Optionally, the first obtaining module further includes: the device comprises a first acquisition unit, a first determination unit, a second determination unit, a first calculation unit and a third determination unit. The first acquisition unit is used for acquiring three-phase voltage of the energy storage power station at a grid connection point; the first determining unit is used for determining the positive sequence voltage of the grid connection point according to the three-phase voltage; the second determining unit is used for determining a plurality of frequency variation quantities of the grid-connected point in one cycle according to the positive sequence voltage and the rated power of the grid-connected point; the first calculating unit is used for calculating the average value of the multiple frequency variation quantities to obtain the target frequency variation quantity of the grid-connected point; and the third determining unit is used for determining the grid-connected point frequency according to the target frequency variation and the rated power.
Optionally, the first obtaining module further includes: the device comprises a second acquisition unit, a fourth determination unit, a fifth determination unit, a sixth determination unit, a seventh determination unit and an eighth determination unit. The second acquisition unit is used for acquiring the total branch voltage and the total branch current of the energy storage power station; the fourth determining unit is used for determining three target phase voltages corresponding to the total branch voltage and three target phase currents corresponding to the total branch current according to a root mean square algorithm, wherein each target phase current corresponds to one target phase voltage; a fifth determining unit, configured to determine a first phase voltage corresponding to each target phase voltage before one cycle and a first phase current corresponding to the first phase voltage; a sixth determining unit, configured to determine a second phase current corresponding to each target phase current before 3/4 cycle; the seventh determining unit is used for determining a third phase current corresponding to each target phase current before 7/4 cycle; and the eighth determining unit is used for determining the total active power and the total reactive power of the energy storage power station according to the target phase voltage, the target phase current and other power data, wherein the other power data comprise the first phase voltage, the first phase current, the second phase current and the third phase current.
Optionally, the power processing module further includes: a first detection unit, a ninth determination unit, and a first summation calculation unit. The first detection unit is used for detecting the frequency magnitude relation between the grid-connected point frequency and a preset minimum frequency and a preset maximum frequency; a ninth determining unit, configured to determine a target active power increment according to the frequency magnitude relationship; and the first summation calculation unit is used for summing the total active power and the target active power increment to obtain the target active power.
Optionally, the ninth determining unit further includes: a first determining subunit, a second determining subunit, and a third determining subunit. The grid-connected point frequency determining unit is used for determining that the target active power increment is 0 when the grid-connected point frequency is less than or equal to a preset maximum frequency and the grid-connected point frequency is greater than or equal to a preset minimum frequency; the second determining subunit is used for determining a target active power increment according to a preset frequency modulation difference adjustment coefficient, a preset maximum frequency and the grid-connected point frequency when the grid-connected point frequency is greater than the preset maximum frequency; and the third determining subunit is used for determining the target active power increment according to the frequency modulation difference adjustment coefficient, the preset minimum frequency and the grid-connected point frequency when the grid-connected point frequency is smaller than the preset minimum frequency.
Optionally, the power processing module further includes: a second detection unit, a tenth determination unit, and an eleventh determination unit. The second detection unit is used for detecting the voltage magnitude relation between the total branch voltage and a preset minimum voltage and a preset maximum voltage; a tenth determining unit, configured to determine a target reactive power increment according to the voltage magnitude relationship; and the eleventh determining unit is used for summing the total reactive power and the target reactive power increment to obtain the target reactive power.
Optionally, the tenth determining unit further includes: a fourth determination subunit, a fifth determination subunit, and a sixth determination subunit. The fourth determining subunit is configured to determine that the target reactive power increment is 0 when the total branch voltage is less than or equal to the preset maximum voltage and the total branch voltage is greater than or equal to the preset minimum voltage; the fifth determining subunit is configured to determine, when the total branch voltage is greater than the preset maximum voltage, a target reactive power increment according to the voltage difference adjustment coefficient, the preset maximum voltage, and the total branch voltage; and the sixth determining subunit is used for determining the target reactive power increment according to the voltage difference adjustment coefficient, the preset minimum voltage and the total branch voltage when the total branch voltage is less than the preset minimum voltage.
Optionally, the determining module further includes: a third detection unit, a fourth detection unit, a twelfth determination unit, a thirteenth determination unit, a fourth detection unit, a fourteenth determination unit, and a fifteenth determination unit. The third detection unit is used for detecting whether the target power is a negative number, wherein the target power is target active power or target reactive power; the fourth detection unit is used for detecting whether the current residual capacity is smaller than the preset maximum residual capacity or not when the target power is a negative number; a twelfth determining unit, configured to determine a weight value according to the maximum remaining power and the current remaining power when the current remaining power is less than the maximum remaining power; a thirteenth determining unit configured to determine that the weight value is 0 in a case where the current remaining capacity is greater than or equal to the maximum remaining capacity; the fourth detection unit is used for detecting whether the current residual capacity is greater than the preset minimum residual capacity or not when the target power is a non-negative number; a fourteenth determining unit, configured to determine a weight value according to the minimum remaining power and the current remaining power when the current remaining power is greater than the minimum remaining power; a fifteenth determining unit, configured to determine that the weight value is 0 when the current remaining capacity is less than or equal to the minimum remaining capacity.
Optionally, the weight value corresponding to each energy storage converter is determined by the following formula:
wherein, w soci The weighted value is corresponding to the ith energy storage converter in the at least two energy storage converters; soc i The current residual capacity of the ith energy storage converter is obtained; soc L Is the minimum remaining capacity; soc H Is the maximum remaining capacity; n is the number of energy storage converters in the energy storage power station, and X is the target power.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A power distribution method of an energy storage power station is characterized by comprising the following steps:
acquiring grid-connected point frequency and total power of an energy storage power station, wherein the total power at least comprises total active power and total reactive power of the energy storage power station, and the energy storage power station comprises at least two energy storage converters;
frequency modulation is carried out on the total active power according to the grid-connected point frequency to obtain a target active power, and reactive power voltage regulation is carried out on the total reactive power according to a preset voltage difference regulating coefficient to obtain a target reactive power;
acquiring the current residual electric quantity of each energy storage converter in the energy storage power station;
determining a weight value corresponding to each energy storage converter according to the current residual electric quantity, wherein the weight value represents the distribution proportion of each energy storage converter in the power distribution process;
and distributing the target active power and the target reactive power to at least two energy storage converters according to the corresponding weight value of each energy storage converter.
2. The power distribution method of the energy storage power station of claim 1 wherein obtaining the grid-connected point frequency of the energy storage power station comprises:
collecting three-phase voltage of the energy storage power station at a grid connection point;
determining the positive sequence voltage of the grid-connected point according to the three-phase voltage;
determining a plurality of frequency variations of the grid-connected point in a cycle according to the positive sequence voltage and the rated power of the grid-connected point;
calculating the average value of the plurality of frequency variation quantities to obtain the target frequency variation quantity of the grid-connected point;
and determining the frequency of the grid-connected point according to the target frequency variation and the rated power.
3. The power distribution method of an energy storage power plant of claim 1 wherein obtaining the total power of the energy storage power plant comprises:
collecting the total branch voltage and the total branch current of the energy storage power station;
determining three target phase voltages corresponding to the total branch voltage and three target phase currents corresponding to the total branch current according to a root mean square algorithm, wherein each target phase current corresponds to one target phase voltage;
determining a first phase voltage corresponding to each target phase voltage before a cycle and a first phase current corresponding to the first phase voltage;
determining a second phase current corresponding to each target phase current before 3/4 cycle;
determining a third phase current corresponding to each target phase current before 7/4 cycle;
determining total active power and total reactive power of the energy storage power station according to the target phase voltage, the target phase current and other power data, wherein the other power data comprises the first phase voltage, the first phase current, the second phase current and the third phase current.
4. The power distribution method of the energy storage power station of claim 1, wherein the frequency modulation of the total active power according to the grid-connected point frequency to obtain the target active power comprises:
detecting the frequency magnitude relation between the grid-connected point frequency and a preset minimum frequency and a preset maximum frequency;
determining a target active power increment according to the frequency size relation;
and summing the total active power and the target active power increment to obtain the target active power.
5. The power distribution method for energy storage power stations of claim 4, wherein determining the target active power increment according to the frequency magnitude relationship comprises:
when the grid-connected point frequency is less than or equal to the preset maximum frequency and the grid-connected point frequency is greater than or equal to the preset minimum frequency, determining that the target active power increment is 0;
when the grid-connected point frequency is greater than the preset maximum frequency, determining the target active power increment according to a preset frequency modulation difference adjustment coefficient, the preset maximum frequency and the grid-connected point frequency;
and when the grid-connected point frequency is smaller than the preset minimum frequency, determining the target active power increment according to the frequency modulation difference adjustment coefficient, the preset minimum frequency and the grid-connected point frequency.
6. The power distribution method of the energy storage power station of claim 3, wherein the step of dynamically reactive voltage regulating the total reactive power according to a preset voltage difference regulating coefficient to obtain a target reactive power comprises:
detecting the voltage magnitude relation between the total branch voltage and a preset minimum voltage and a preset maximum voltage;
determining a target reactive power increment according to the voltage magnitude relation;
and summing the total reactive power and the target reactive power increment to obtain the target reactive power.
7. The power distribution method of the energy storage power station of claim 6 wherein determining a target reactive power delta based on the voltage magnitude relationship comprises:
when the total branch voltage is less than or equal to the preset maximum voltage and the total branch voltage is greater than or equal to the preset minimum voltage, determining that the target reactive power increment is 0;
when the total branch voltage is greater than the preset maximum voltage, determining the target reactive power increment according to the voltage difference adjustment coefficient, the preset maximum voltage and the total branch voltage;
and when the total branch voltage is smaller than the preset minimum voltage, determining the target reactive power increment according to the voltage difference adjustment coefficient, the preset minimum voltage and the total branch voltage.
8. The power distribution method of the energy storage power station of claim 1, wherein determining the weight value corresponding to each energy storage converter according to the current remaining capacity comprises:
detecting whether target power is negative, wherein the target power is the target active power or the target reactive power;
when the target power is negative, detecting whether the current residual capacity is smaller than a preset maximum residual capacity;
determining the weight value according to the maximum remaining capacity and the current remaining capacity under the condition that the current remaining capacity is smaller than the maximum remaining capacity;
determining that the weight value is 0 when the current remaining capacity is greater than or equal to the maximum remaining capacity;
when the target power is a non-negative number, detecting whether the current residual capacity is greater than a preset minimum residual capacity;
determining the weight value according to the minimum remaining capacity and the current remaining capacity when the current remaining capacity is larger than the minimum remaining capacity;
determining that the weight value is 0 when the current remaining capacity is less than or equal to the minimum remaining capacity.
9. The power distribution method of an energy storage power plant of claim 8 wherein the weight value for each energy storage converter is determined by the following formula:
wherein, w soci The weighted value is corresponding to the ith energy storage converter in at least two energy storage converters; soc i The current residual capacity of the ith energy storage converter is obtained; soc L The minimum remaining capacity is the minimum remaining capacity;
soc H the maximum remaining capacity is the maximum remaining capacity; n is the number of the energy storage converters, and X is the target power.
10. A power distribution apparatus for an energy storage power plant, comprising:
the system comprises a first obtaining module, a second obtaining module and a control module, wherein the first obtaining module is used for obtaining grid-connected point frequency and total power of an energy storage power station, the total power at least comprises total active power and total reactive power of the energy storage power station, and the energy storage power station comprises at least two energy storage converters;
the power processing module is used for carrying out frequency modulation on the total active power according to the grid-connected point frequency to obtain target active power, and carrying out reactive power voltage regulation on the total reactive power according to a preset voltage difference regulation coefficient to obtain target reactive power;
the second acquisition module is used for acquiring the current residual electric quantity of each energy storage converter in the energy storage power station;
the determining module is used for determining a weight value corresponding to each energy storage converter according to the current residual electric quantity, wherein the weight value represents the distribution proportion of each energy storage converter in the power distribution process;
and the power distribution module is used for distributing the target active power and the target reactive power to at least two energy storage converters according to the weight value corresponding to each energy storage converter.
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| CN116365642B (en) * | 2023-03-16 | 2024-01-12 | 佛山科学技术学院 | Self-adaptive power distribution control method and system |
| CN116470607A (en) * | 2023-04-03 | 2023-07-21 | 上海玫克生储能科技有限公司 | Battery pack power distribution method, device, equipment and storage medium |
| CN116470607B (en) * | 2023-04-03 | 2024-01-26 | 上海玫克生储能科技有限公司 | Battery pack power distribution method, device, equipment and storage medium |
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