CN114552608B - Three-phase imbalance treatment method and related device based on charge and discharge of energy storage system - Google Patents
Three-phase imbalance treatment method and related device based on charge and discharge of energy storage system Download PDFInfo
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- CN114552608B CN114552608B CN202210385767.5A CN202210385767A CN114552608B CN 114552608 B CN114552608 B CN 114552608B CN 202210385767 A CN202210385767 A CN 202210385767A CN 114552608 B CN114552608 B CN 114552608B
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The application discloses a three-phase imbalance treatment method and a related device based on charge and discharge of an energy storage system, wherein the method comprises the following steps: acquiring three-phase voltage and battery SOC of a transformer in a distribution network station area; calculating reactive power adjustment power according to the three-phase reactive load and a preset reactive reference value; judging whether the transformer in the distribution network area is overloaded according to the maximum load current, if so, calculating overload discharge active regulation power based on the three-phase voltage; if the transformer in the distribution network area is not overloaded, carrying out light-load charge-discharge judgment according to the battery SOC and a threshold judgment rule, and respectively calculating light-load discharge active regulation power and light-load charge active regulation power; and carrying out three-phase unbalanced regulation operation according to the PCS reactive power, the overload discharge active power, the light load discharge active power and the light load charging active power. The application can solve the technical problems of lack of reliability and stability in the treatment process caused by too simple and lack of pertinence of the condition considered in the prior art.
Description
Technical Field
The application relates to the technical field of electric power energy storage, in particular to a three-phase imbalance treatment method and a related device based on charging and discharging of an energy storage system.
Background
The energy storage system of the distribution area has the main functions of peak clipping, valley filling and electric energy quality control, is usually arranged near a transformer of a certain area of the distribution network, and can be particularly used for controlling the problems of three-phase unbalance, transformer overload and the like. The treatment process of the energy storage system is particularly complex for areas with three-phase unbalance and heavy loads.
At present, three-phase unbalance management of a power distribution area is mainly realized through discharging of an energy storage system, and charging is started when the system is in a valley state, the method leads to that the SOC level of a battery runs at a lower level, even the battery system is possibly in a non-electricity state, the energy storage system cannot complete the area management function, and obviously, the method cannot fully play the management function of the energy storage system.
Disclosure of Invention
The application provides a three-phase unbalance treatment method and a related device based on charging and discharging of an energy storage system, which are used for solving the technical problems that the existing three-phase unbalance treatment process based on charging and discharging of the energy storage system is too simple in consideration, lacks pertinence, and causes the treatment process to lack reliability and stability.
In view of this, the first aspect of the present application provides a method for treating three-phase imbalance based on charging and discharging of an energy storage system, comprising:
acquiring three-phase voltage and battery SOC of a transformer in a distribution network station area;
calculating PCS reactive power regulation power according to the three-phase reactive load at the current moment and a preset reactive reference value;
judging whether the transformer in the distribution network area is overloaded according to the maximum load current, if so, calculating overload discharge active power adjustment based on the minimum load current, the three-phase active load and the three-phase voltage;
if the power distribution network transformer is not overloaded, carrying out light load charge and discharge judgment according to the battery SOC and a threshold judgment rule, and respectively calculating light load discharge active power regulation and light load charge active power regulation, wherein the threshold judgment rule comprises a first SOC threshold and a second SOC threshold, and the first SOC threshold is smaller than the second SOC threshold;
and carrying out three-phase unbalanced regulation operation according to the PCS reactive power regulation, the overload discharge active power regulation, the light load discharge active power regulation and the light load charging active power regulation.
Preferably, the calculating the PCS reactive power adjustment power according to the three-phase reactive load at the current moment and the preset reactive reference value includes:
adding the three-phase reactive power measured value of the transformer in the distribution network area at the current moment with the three-phase reactive power of the energy storage converter to obtain a three-phase reactive load;
calculating a three-phase reactive value of the transformer in the distribution network station area according to the three-phase reactive load to obtain a preset reactive reference value;
and subtracting the three-phase reactive load from the preset reactive reference value respectively to obtain three-phase PCS reactive power regulation power.
Preferably, the determining whether the transformer in the distribution network area is overloaded according to the maximum load current, if yes, calculating the overload discharge active power based on the minimum load current, the three-phase active load and the three-phase voltage, and further includes:
adding the three-phase active power measured value of the transformer in the distribution network area with the three-phase active power of the energy storage converter to obtain a three-phase active load;
calculating corresponding three-phase current according to the three-phase current measured value of the transformer in the distribution network area, the three-phase voltage and the three-phase active power of the energy storage converter;
the maximum value of the three-phase currents is defined as a maximum load current, and the minimum value is defined as a minimum load current.
Preferably, if the transformer in the distribution network area is not overloaded, performing light load charging and discharging judgment according to the battery SOC and a threshold judgment rule, and calculating light load discharging active power adjustment and light load charging active power adjustment respectively, including:
if the transformer in the distribution network area is not overloaded, judging whether the battery SOC is smaller than a first threshold value or not, or if the battery SOC is between the first SOC threshold value and a second SOC threshold value and meets a preset charging condition, if so, calculating light-load charging active regulation power according to the maximum load current, the three-phase active load and the three-phase voltage;
the preset charging condition is that the battery SOC is between the first SOC threshold value and the second SOC threshold value for the first time, or the energy storage system is in a charging state at the previous moment;
and if the battery SOC is larger than the second SOC threshold, or the battery SOC is between the first SOC threshold and the second SOC threshold and is in a discharge state at the previous moment, calculating the light load discharge active power according to the minimum load current, the three-phase active load and the three-phase voltage.
The second aspect of the application provides a three-phase imbalance treatment device based on charging and discharging of an energy storage system, comprising:
the data acquisition module is used for acquiring the three-phase voltage and the battery SOC of the transformer in the distribution network area;
the reactive power calculation module is used for calculating PCS reactive power regulation power according to the three-phase reactive load at the current moment and a preset reactive reference value;
the overload calculation module is used for judging whether the transformer in the distribution network area is overloaded according to the maximum load current, and if yes, calculating overload discharge active regulation power based on the minimum load current, the three-phase active load and the three-phase voltage;
the light load judging module is used for judging light load charge and discharge according to the battery SOC and a threshold judging rule if the transformer in the distribution network area is not overloaded, and respectively calculating light load discharge active power regulation and light load charge active power regulation, wherein the threshold judging rule comprises a first SOC threshold value and a second SOC threshold value, and the first SOC threshold value is smaller than the second SOC threshold value;
and the three-phase treatment module is used for carrying out three-phase unbalanced regulation operation according to the PCS reactive power regulation power, the overload discharge active power regulation power, the light load discharge active power regulation power and the light load charging active power regulation power.
Preferably, the reactive power calculation module includes:
the reactive load calculation sub-module is used for adding the three-phase reactive power measured value of the transformer in the distribution network area at the current moment with the three-phase reactive power of the energy storage converter to obtain a three-phase reactive load;
the reactive reference value calculation sub-module is used for calculating the three-phase reactive value of the transformer in the distribution network station area according to the three-phase reactive load to obtain a preset reactive reference value;
and the reactive power regulation power calculation sub-module is used for subtracting the three-phase reactive load from the preset reactive reference value respectively to obtain three-phase PCS reactive power regulation.
Preferably, the method further comprises:
the active load calculation module is used for adding the three-phase active power measured value of the transformer in the distribution network area and the three-phase active power of the energy storage converter to obtain a three-phase active load;
the three-phase current calculation module is used for calculating corresponding three-phase currents according to the three-phase current measured value of the transformer in the distribution network area, the three-phase voltage and the three-phase active power of the energy storage converter;
and the load current definition module is used for defining the maximum value of the three-phase currents as the maximum load current and the minimum value as the minimum load current.
Preferably, the light load judging module includes:
the light load charging judging sub-module is used for judging whether the battery SOC is smaller than a first threshold value or not if the transformer in the distribution network area is not overloaded, or whether the battery SOC is between the first SOC threshold value and a second SOC threshold value and meets a preset charging condition, if yes, light load charging active regulation power is calculated according to the maximum load current, the three-phase active load and the three-phase voltage;
the preset charging condition is that the battery SOC is between the first SOC threshold value and the second SOC threshold value for the first time, or the energy storage system is in a charging state at the previous moment;
and the light load discharging judging sub-module is used for calculating the light load discharging active power according to the minimum load current, the three-phase active load and the three-phase voltage if the battery SOC is larger than the second SOC threshold value or the battery SOC is between the first SOC threshold value and the second SOC threshold value and is in a discharging state at the previous moment.
A third aspect of the present application provides a three-phase imbalance remediation device based on charging and discharging of an energy storage system, the device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the three-phase imbalance management method based on charging and discharging of the energy storage system according to the first aspect according to the instructions in the program code.
A fourth aspect of the present application provides a computer readable storage medium storing program code for executing the three-phase imbalance management method based on charging and discharging of an energy storage system according to the first aspect.
From the above technical solutions, the embodiment of the present application has the following advantages:
the application provides a three-phase imbalance treatment method based on charging and discharging of an energy storage system, which comprises the following steps: acquiring three-phase voltage and battery SOC of a transformer in a distribution network station area; calculating PCS reactive power regulation power according to the three-phase reactive load at the current moment and a preset reactive reference value; judging whether a transformer in a distribution network area is overloaded according to the maximum load current, if so, calculating overload discharge active regulation power based on the minimum load current, the three-phase active load and the three-phase voltage; if the transformer in the distribution network area is not overloaded, carrying out light load charge and discharge judgment according to a battery SOC and a threshold judgment rule, and respectively calculating light load discharge active power regulation and light load charge active power regulation, wherein the threshold judgment rule comprises a first SOC threshold and a second SOC threshold, and the first SOC threshold is smaller than the second SOC threshold; and carrying out three-phase unbalanced regulation operation according to the PCS reactive power, the overload discharge active power, the light load discharge active power and the light load charging active power.
According to the three-phase unbalance management method based on the charging and discharging of the energy storage system, different power adjustment analysis is performed on reactive power and active power, threshold analysis based on the battery SOC is performed on the active power adjustment process, wherein the threshold analysis comprises active power adjustment under the condition of light load charging and active power adjustment under the condition of light load discharging, the considered conditions are more detailed, the analyzed index parameters are more, and the actual running state of the energy storage system is more met, so that the reliability and stability of the three-phase unbalance management can be ensured. Therefore, the application can solve the technical problems of the existing three-phase unbalanced treatment process based on the charge and discharge of the energy storage system that the consideration condition is too simple, the pertinence is lacking, and the reliability and the stability are lacking in the treatment process.
Drawings
FIG. 1 is a schematic flow chart of a three-phase imbalance treatment method based on charging and discharging of an energy storage system according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of a three-phase imbalance treatment method based on charging and discharging of an energy storage system according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a three-phase imbalance treatment device based on charging and discharging of an energy storage system according to an embodiment of the present application;
fig. 4 is a schematic diagram of an energy storage system in a power distribution area according to an embodiment of the present application.
Detailed Description
In order to make the present application better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
For easy understanding, referring to fig. 1, an embodiment one of a three-phase imbalance management method based on charging and discharging of an energy storage system provided by the present application includes:
and step 101, acquiring the three-phase voltage and the battery SOC of the transformer in the distribution network area.
The three-phase voltage is a phase voltage value of the ac side of the transformer at a certain time, for example, at the current time; the SOC of the battery is the state of charge, representing the percentage of the remaining available power of the battery to the total capacity, and is one of the most important states in the battery management system.
It should be noted that referring to fig. 4, the embodiment of the present application is directed to a three-phase imbalance management of an energy storage system in a distribution network station, where the system mainly includes main devices such as an energy storage incoming line breaker, an energy storage converter, an energy storage battery, and a transformer in the distribution station, and the three-phase imbalance includes three-phase active and three-phase reactive imbalance. The active and reactive three-phase unbalance instruction is that the low-voltage distribution transformer area electric energy storage energy management system calculates the active and reactive three-phase instruction of the energy storage system according to the three-phase load power or the three-phase load current of the transformer area, and sends the active and reactive three-phase instruction to the energy storage converter to charge and discharge the energy storage system so as to offset the unbalance amount and ensure the consistency of the three-phase load of the transformer area.
In the early stage, besides the parameters, the current, active power and reactive power in the terminal of the transformer area can be obtained for subsequent three-phase imbalance treatment analysis, the specific data acquisition process is not repeated, and related data can be extracted as required.
And 102, calculating PCS reactive power regulation power according to the three-phase reactive load at the current moment and a preset reactive reference value.
The three-phase reactive load at the current moment can be calculated according to the three-phase reactive load of the transformer and the three-phase reactive power of the energy storage converter, and the three-phase reactive load of the transformer can be measured. The preset reactive reference value refers to the median value of reactive power values of each phase of the user load. Reactive power adjustment of the energy storage system can be achieved based on PCS reactive power adjustment.
And step 103, judging whether the transformer in the distribution network area is overloaded according to the maximum load current, and if so, calculating the overload power amplifier active regulation power based on the minimum load current, the three-phase active load and the three-phase voltage.
After reactive power adjustment of the energy storage system is completed, a timer can be adopted to count time, and after the time reaches the preset waiting time, active three-phase imbalance treatment can be started.
The active three-phase unbalance management is divided into overload and non-overload situations of the transformer, so that overload judgment is needed, the judgment basis is maximum load current, a load current threshold value is set, if the maximum load current exceeds the load current threshold value, the overload of the transformer is judged, and at the moment, the load is required to be reduced by discharging, so that the overload discharging active regulation power calculation is carried out, and the discharging power is obtained. The load current can be calculated from the three-phase voltages, and then the maximum value and the minimum value are selected.
104, if the transformer in the distribution network area is not overloaded, carrying out light load charge and discharge judgment according to the battery SOC and a threshold judgment rule, and respectively calculating light load discharge active power adjustment and light load charge active power adjustment, wherein the threshold judgment rule comprises a first SOC threshold and a second SOC threshold, and the first SOC threshold is smaller than the second SOC threshold.
If the transformers in the distribution network area are not overloaded, analysis is performed under the two different conditions of charging and discharging, but the judging standard is changed into the battery SOC, the judging condition is mainly comparison of threshold ranges, whether light load charging or light load discharging is performed can be judged according to different threshold ranges and some preset operation judging rules, and then the corresponding light load discharging/charging active power adjustment power is calculated according to different charging and discharging requirements. The first SOC threshold value and the second SOC threshold value are set according to actual conditions, and are not limited herein, but the first SOC threshold value is smaller than the second SOC threshold value.
And 105, carrying out three-phase unbalanced adjustment operation according to the PCS reactive power adjustment, the overload discharge active power adjustment, the light load discharge active power adjustment and the light load charging active power adjustment.
It will be appreciated that a waiting time is required between reactive power adjustment and active power adjustment, and is specifically set according to practical situations, which will not be described herein. The three-phase unbalance adjustment operation is carried out according to the calculated adjustment power, so that the operation characteristics of an actual energy storage system are more consistent, the effect of the three-phase unbalance management of the energy storage system is more reliable, namely, the energy storage system can be charged only at the moment of low electricity consumption, enough electricity can be discharged when the energy storage system discharges, and the three-phase unbalance management of the energy storage system is more stable.
According to the three-phase unbalance management method based on the charging and discharging of the energy storage system, different power adjustment analysis is performed on reactive power and active power, threshold analysis based on the battery SOC is performed on the active power adjustment process, the active power adjustment under the condition of light load charging and the active power adjustment under the condition of light load discharging are included, the considered conditions are more detailed, analyzed index parameters are more, the actual running state of the energy storage system is more met, and therefore reliability and stability of three-phase unbalance management can be ensured. Therefore, the embodiment of the application can solve the technical problems of the existing three-phase unbalanced treatment process based on the charge and discharge of the energy storage system that the consideration condition is too simple, the pertinence is lacking, and the reliability and the stability are lacking in the treatment process.
For easy understanding, referring to fig. 2, the present application provides a second embodiment of a three-phase imbalance management method based on charging and discharging of an energy storage system, including:
step 201, three-phase voltage and battery SOC of a transformer in a distribution network area are obtained.
And 202, adding the three-phase reactive power measured value of the transformer in the distribution network area at the current moment to the three-phase reactive power of the energy storage converter to obtain a three-phase reactive load.
If the current moment is t, the three-phase reactive power measurement value of the transformation of the distribution network area is expressed asEnergy storage converterExpressed as Q D· (t) the three-phase reactive load can be expressed as +.>Then the specific calculation formula is:
it can be understood that "·" in the formula can take the values of a, b and c three phases, and the three-phase reactive load is the reactive load value of each phase.
And 203, calculating a three-phase reactive value of the transformer in the distribution network area according to the three-phase reactive load to obtain a preset reactive reference value.
Taking the three-phase reactive value of the transformer as a preset reactive reference value, and specifically calculating as follows:
wherein Q is med And (t) is a preset reactive reference value, namely a reactive power intermediate value of the user load of the transformer.
And 204, subtracting the three-phase reactive load from a preset reactive reference value respectively to obtain three-phase PCS reactive power regulation power.
The reactive power regulation power of the PCS (energy storage converter) refers to a reactive power control instruction at the next time t+1, and can be specifically expressed as follows:
wherein Q is Da (t+1)、Q Db (t+1)、Q Dc And (t+1) is the reactive power regulation power of the PCS of the three phases a, b and c at the time t+1.
Step 205, adding the three-phase active power measured value of the transformer in the distribution network area and the three-phase active power of the energy storage converter to obtain a three-phase active load.
After reactive power adjustment is completed by adopting PCS reactive power adjustment, a timer is adopted for timing, and after the preset waiting time is reached, active power adjustment analysis can be started, and the timer is reset. The calculation process of the three-phase active load is similar to the calculation process of the three-phase reactive power, and the same is that the power of the transformer and the power of the energy storage converter are added, namely:
wherein, the three-phase active power measurement value of the transformation of the distribution network area isThe three-phase active power of the energy storage converter is P D· (t) the three-phase active load can be expressed as +.>"." can be given three phases a, b and c.
And 206, calculating corresponding three-phase current according to the three-phase current measured value of the transformer in the distribution network area, the three-phase voltage and the three-phase active power of the energy storage converter.
The three-phase current is the actual load current at the low side of the transformer, and the corresponding three-phase current calculation process is as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,the method is characterized in that a, b and c three-phase current measurement values of a transformer in a distribution network area are obtained, namely, the terminal of the transformer measures the current, < >>Namely a, b and c three-phase current, namely electricity comprising PCS reactive current of the energy storage converterFlow value, U a (t)、U b (t)、U c And (t) is the three-phase voltages of a, b and c.
Step 207, defining the maximum value of the three-phase currents as the maximum load current, and defining the minimum value as the minimum load current.
The specific definition can be expressed as the following formula:
wherein I is max (t)、I min (t) maximum load current and minimum load current, respectively.
And step 208, judging whether the transformer in the distribution network area is overloaded according to the maximum load current, and if so, calculating the overload power amplifier active regulation power based on the minimum load current, the three-phase active load and the three-phase voltage.
The process of judging whether the transformer in the distribution network area is overloaded according to the maximum load current is to make the maximum load current I max (t) and the preset allowable operating current I N For comparison, if I max (t)＞I N And indicating that the transformer is overloaded, and the peak clipping discharge is needed, namely, the overload active power adjustment is needed to be calculated for overload active power adjustment. The specific overload discharge active power regulation calculation process comprises the following steps:
wherein, the liquid crystal display device comprises a liquid crystal display device,the power is actively regulated by overload discharge of the three phases a, b and c at the time t+1.
Step 209, if the transformer in the distribution network area is not overloaded, judging whether the battery SOC is smaller than a first threshold, or if the battery SOC is between the first SOC threshold and a second SOC threshold and satisfies a preset charging condition, if yes, calculating the light-load charging active power according to the maximum load current, the three-phase active load and the three-phase voltage.
The threshold value judging rule includes a first SOC threshold value and a second SOC threshold value, where the first SOC threshold value is smaller than the second SOC threshold value; the preset charging condition is that the battery SOC is between the first SOC threshold value and the second SOC threshold value for the first time, or the energy storage system is in a charging state at the previous moment.
When the maximum load current I max (t) is less than or equal to a preset allowable operating current I N When the transformer is in a light load state, the transformer is not in a charging mode, and quantitative judgment analysis is performed based on the state of charge (SOC) of the battery. Assuming that the first SOC threshold value is x and the second SOC threshold value is y, the judgment condition is:
when the battery SOC is between [ x, y ] and the battery SOC is between the first SOC threshold and the second SOC threshold for the first time;
or when the SOC of the battery is between [ x, y ], and the previous time t-1 of the energy storage system is in a charging state;
alternatively, when the battery SOC is less than the first threshold value x; the energy storage system can be judged to enter a charging mode as long as one of the three conditions is met, and meanwhile, the charging active power adjustment power in light load is calculated according to the maximum load current, the three-phase active load and the three-phase voltage. The specific calculation process is as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,the power is adjusted by the light load charging active power of the three phases a, b and c at the time t+1.
Step 210, if the battery SOC is greater than the second SOC threshold, or the battery SOC is between the first SOC threshold and the second SOC threshold and is in the discharge state at the previous time, calculating the light load discharge active power according to the minimum load current, the three-phase active load and the three-phase voltage.
The judgment conditions of the discharge are as follows:
when the SOC of the battery is between [ x, y ], and the previous time t-1 of the energy storage system is in a discharge state;
or when the battery SOC is larger than the second threshold value y, judging that the energy storage system needs to be discharged as long as any one of the two conditions is met, and calculating the light load discharge active power according to the minimum load current, the three-phase active load and the three-phase voltage. The specific calculation process is as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,the power is actively regulated by light load discharge of the three phases a, b and c at the time t+1.
Step 211, performing three-phase unbalanced adjustment operation according to the PCS reactive power, the overload discharge active power, the light load discharge active power and the light load charging active power.
According to the three-phase unbalance management method based on the charging and discharging of the energy storage system, different power adjustment analysis is performed on reactive power and active power, threshold analysis based on the battery SOC is performed on the active power adjustment process, the active power adjustment under the condition of light load charging and the active power adjustment under the condition of light load discharging are included, the considered conditions are more detailed, analyzed index parameters are more, the actual running state of the energy storage system is more met, and therefore reliability and stability of three-phase unbalance management can be ensured. Therefore, the embodiment of the application can solve the technical problems of the existing three-phase unbalanced treatment process based on the charge and discharge of the energy storage system that the consideration condition is too simple, the pertinence is lacking, and the reliability and the stability are lacking in the treatment process.
For ease of understanding, referring to fig. 3, the present application further provides an embodiment of a three-phase imbalance management apparatus based on charging and discharging of an energy storage system, including:
the data acquisition module 301 is configured to acquire a three-phase voltage and a battery SOC of a transformer in a distribution network station;
the reactive power calculation module 302 is configured to calculate PCS reactive power adjustment power according to the three-phase reactive load at the current moment and a preset reactive reference value;
the overload calculation module 303 is configured to determine whether the transformer in the distribution network area is overloaded according to the maximum load current, and if yes, calculate the active adjustment power of the overload discharge based on the minimum load current, the three-phase active load and the three-phase voltage;
the light load judging module 304 is configured to, if the transformer in the distribution network area is not overloaded, perform light load charging and discharging judgment according to a battery SOC and a threshold judging rule, and calculate a light load discharging active power adjustment and a light load charging active power adjustment respectively, where the threshold judging rule includes a first SOC threshold and a second SOC threshold, and the first SOC threshold is smaller than the second SOC threshold;
the three-phase governing module 305 is configured to perform three-phase unbalanced adjustment operation according to the PCS reactive power adjustment, the overload discharge active power adjustment, the light load discharge active power adjustment and the light load charging active power adjustment.
Further, the reactive power calculation module 302 includes:
the reactive load calculation submodule 3021 is used for adding the three-phase reactive power measured value of the transformer in the distribution network area at the current moment with the three-phase reactive power of the energy storage converter to obtain a three-phase reactive load;
the reactive reference value calculation submodule 3022 is used for calculating a three-phase reactive value of the transformer in the distribution network station area according to the three-phase reactive load to obtain a preset reactive reference value;
and the reactive power regulation power calculation submodule 3023 is used for subtracting the preset reactive reference values from the three-phase reactive loads respectively to obtain three-phase PCS reactive power regulation.
Further, the method further comprises the following steps:
the active load calculation module 306 is configured to add the three-phase active power measurement value of the transformer in the distribution network area to the three-phase active power of the energy storage converter to obtain a three-phase active load;
the three-phase current calculation module 307 is configured to calculate a corresponding three-phase current according to the three-phase current measurement value of the transformer in the distribution network area, the three-phase voltage and the three-phase active power of the energy storage converter;
the load current definition module 308 is configured to define a maximum value of the three-phase currents as a maximum load current and a minimum value as a minimum load current.
Further, the light load judging module 304 includes:
the light-load charging judging submodule 3041 is used for judging whether the battery SOC is smaller than a first threshold value or not if the transformer in the distribution network area is not overloaded, or if the battery SOC is between the first SOC threshold value and a second SOC threshold value and meets a preset charging condition, if so, calculating the light-load charging active regulation power according to the maximum load current, the three-phase active load and the three-phase voltage;
the preset charging condition is that the battery SOC is between a first SOC threshold value and a second SOC threshold value for the first time, or the energy storage system is in a charging state at the previous moment;
the light load discharging judging submodule 3042 is configured to calculate the light load discharging active power according to the minimum load current, the three-phase active load and the three-phase voltage if the battery SOC is greater than the second SOC threshold value, or if the battery SOC is between the first SOC threshold value and the second SOC threshold value and is in the discharging state at the previous time.
The application also provides three-phase imbalance treatment equipment based on the charge and discharge of the energy storage system, which comprises a processor and a memory;
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is used for executing the three-phase imbalance management method based on the charge and discharge of the energy storage system in the method embodiment according to the instructions in the program codes.
The application also provides a computer readable storage medium, which is used for storing program codes, and the program codes are used for executing the three-phase imbalance treatment method based on the charge and discharge of the energy storage system in the embodiment of the method.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for executing all or part of the steps of the method according to the embodiments of the present application by means of a computer device (which may be a personal computer, a server, or a network device, etc.). And the aforementioned storage medium includes: u disk, mobile hard disk, read-Only Memory (ROM), random access Memory (RandomAccess Memory, RAM), magnetic disk or optical disk, etc.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. The three-phase imbalance treatment method based on the charge and discharge of the energy storage system is characterized by comprising the following steps of:
acquiring three-phase voltage and battery SOC of a transformer in a distribution network station area;
calculating PCS reactive power regulation power according to the three-phase reactive load at the current moment and a preset reactive reference value;
judging whether the transformer in the distribution network area is overloaded according to the maximum load current, if so, calculating overload discharge active power adjustment based on the minimum load current, the three-phase active load and the three-phase voltage;
if the transformer in the distribution network area is not overloaded, carrying out light load charge-discharge judgment according to the battery SOC and a threshold judgment rule, and respectively calculating light load discharge active power regulation and light load charge active power regulation, wherein the threshold judgment rule comprises a first SOC threshold and a second SOC threshold, the first SOC threshold is smaller than the second SOC threshold, and concretely,
if the transformer in the distribution network area is not overloaded, judging whether the battery SOC is smaller than a first threshold value or not, or if the battery SOC is between the first SOC threshold value and a second SOC threshold value and meets a preset charging condition, if so, calculating light-load charging active regulation power according to the maximum load current, the three-phase active load and the three-phase voltage;
the preset charging condition is that the battery SOC is between the first SOC threshold value and the second SOC threshold value for the first time, or the energy storage system is in a charging state at the previous moment;
if the battery SOC is larger than the second SOC threshold, or the battery SOC is between the first SOC threshold and the second SOC threshold and is in a discharge state at the previous moment, calculating the light load discharge active power according to the minimum load current, the three-phase active load and the three-phase voltage;
and carrying out three-phase unbalanced regulation operation according to the PCS reactive power regulation, the overload discharge active power regulation, the light load discharge active power regulation and the light load charging active power regulation.
2. The method for managing the three-phase imbalance based on the charge and discharge of the energy storage system according to claim 1, wherein the calculating the PCS reactive power adjustment power according to the three-phase reactive load at the current time and the preset reactive reference value comprises:
adding the three-phase reactive power measured value of the transformer in the distribution network area at the current moment with the three-phase reactive power of the energy storage converter to obtain a three-phase reactive load;
calculating a three-phase reactive value of the transformer in the distribution network station area according to the three-phase reactive load to obtain a preset reactive reference value;
and subtracting the three-phase reactive load from the preset reactive reference value respectively to obtain three-phase PCS reactive power regulation power.
3. The method for managing three-phase imbalance based on charging and discharging of an energy storage system according to claim 1, wherein the determining whether the transformer in the distribution network area is overloaded according to the maximum load current, if yes, calculating the active adjustment power of the overload discharge based on the minimum load current, the three-phase active load and the three-phase voltage, further comprises:
adding the three-phase active power measured value of the transformer in the distribution network area with the three-phase active power of the energy storage converter to obtain a three-phase active load;
calculating corresponding three-phase current according to the three-phase current measured value of the transformer in the distribution network area, the three-phase voltage and the three-phase active power of the energy storage converter;
the maximum value of the three-phase currents is defined as a maximum load current, and the minimum value is defined as a minimum load current.
4. Three-phase unbalance management device based on energy storage system charge-discharge, its characterized in that includes:
the data acquisition module is used for acquiring the three-phase voltage and the battery SOC of the transformer in the distribution network area;
the reactive power calculation module is used for calculating PCS reactive power regulation power according to the three-phase reactive load at the current moment and a preset reactive reference value;
the overload calculation module is used for judging whether the transformer in the distribution network area is overloaded according to the maximum load current, and if yes, calculating overload discharge active regulation power based on the minimum load current, the three-phase active load and the three-phase voltage;
the light load judging module is used for judging light load charge and discharge according to the battery SOC and a threshold judging rule if the transformer in the distribution network area is not overloaded, and respectively calculating light load discharge active power regulation and light load charge active power regulation, wherein the threshold judging rule comprises a first SOC threshold value and a second SOC threshold value, and the first SOC threshold value is smaller than the second SOC threshold value;
specifically, the light load judging module includes:
the light load charging judging sub-module is used for judging whether the battery SOC is smaller than a first threshold value or not if the transformer in the distribution network area is not overloaded, or whether the battery SOC is between the first SOC threshold value and a second SOC threshold value and meets a preset charging condition, if yes, light load charging active regulation power is calculated according to the maximum load current, the three-phase active load and the three-phase voltage;
the preset charging condition is that the battery SOC is between the first SOC threshold value and the second SOC threshold value for the first time, or the energy storage system is in a charging state at the previous moment;
the light load discharging judging sub-module is used for calculating the light load discharging active power according to the minimum load current, the three-phase active load and the three-phase voltage if the battery SOC is larger than the second SOC threshold value or the battery SOC is between the first SOC threshold value and the second SOC threshold value and is in a discharging state at the previous moment;
and the three-phase treatment module is used for carrying out three-phase unbalanced regulation operation according to the PCS reactive power regulation power, the overload discharge active power regulation power, the light load discharge active power regulation power and the light load charging active power regulation power.
5. The energy storage system charge and discharge based three-phase imbalance remediation device of claim 4, wherein the reactive power calculation module comprises:
the reactive load calculation sub-module is used for adding the three-phase reactive power measured value of the transformer in the distribution network area at the current moment with the three-phase reactive power of the energy storage converter to obtain a three-phase reactive load;
the reactive reference value calculation sub-module is used for calculating the three-phase reactive value of the transformer in the distribution network station area according to the three-phase reactive load to obtain a preset reactive reference value;
and the reactive power regulation power calculation sub-module is used for subtracting the three-phase reactive load from the preset reactive reference value respectively to obtain three-phase PCS reactive power regulation.
6. The energy storage system charge and discharge based three-phase imbalance remediation device of claim 4, further comprising:
the active load calculation module is used for adding the three-phase active power measured value of the transformer in the distribution network area and the three-phase active power of the energy storage converter to obtain a three-phase active load;
the three-phase current calculation module is used for calculating corresponding three-phase currents according to the three-phase current measured value of the transformer in the distribution network area, the three-phase voltage and the three-phase active power of the energy storage converter;
and the load current definition module is used for defining the maximum value of the three-phase currents as the maximum load current and the minimum value as the minimum load current.
7. The three-phase imbalance treatment equipment based on the charge and discharge of the energy storage system is characterized by comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the three-phase imbalance management method based on charging and discharging of the energy storage system according to any one of claims 1-3 according to instructions in the program code.
8. A computer readable storage medium for storing program code for performing the energy storage system charge and discharge based three-phase imbalance remediation method of any one of claims 1-3.
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| CN117060476B (en) * | 2023-10-11 | 2024-02-13 | 南方电网电力科技股份有限公司 | Battery energy storage device, battery energy storage control method and equipment |
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