CN113675868B - Energy storage voltage regulation control method and device considering power factor of power grid - Google Patents

Energy storage voltage regulation control method and device considering power factor of power grid Download PDF

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CN113675868B
CN113675868B CN202110938655.3A CN202110938655A CN113675868B CN 113675868 B CN113675868 B CN 113675868B CN 202110938655 A CN202110938655 A CN 202110938655A CN 113675868 B CN113675868 B CN 113675868B
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energy storage
power
voltage
grid
output
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CN113675868A (en
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邓铭
黄际元
吴东琳
唐梦娴
石彪
钱军
胡斌奇
李人晟
李俊雄
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State Grid Corp of China SGCC
State Grid Hunan Electric Power Co Ltd
Changsha Power Supply Co of State Grid Hunan Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Hunan Electric Power Co Ltd
Changsha Power Supply Co of State Grid Hunan Electric Power Co Ltd
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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
    • 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
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • 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
    • Y02E40/30—Reactive power compensation

Abstract

The invention discloses an energy storage voltage regulation control method and device considering power factors of a power grid. By detecting the operation parameters of the power grid, the energy storage system is controlled to charge and discharge the reactive power, the voltage fluctuation problems such as the voltage fluctuation of the power grid are solved, the voltage stability of the power grid and the quality of power supply electric energy are improved, meanwhile, the application scene of energy storage is widened to a certain extent, and the application economy of the energy storage system is extended.

Description

Energy storage voltage regulation control method and device considering power factor of power grid
Technical Field
The invention belongs to the field of energy storage control, and particularly relates to an energy storage voltage regulation control method considering power factors of a power grid.
Background
The power quality problem, especially the voltage fluctuation problem, has increasingly attracted general attention of domestic and foreign power systems and power consumers. Power quality issues typically include voltage spikes, voltage fluctuations, voltage interruptions, voltage imbalances, and harmonic interference. Among these power quality problems, the most severe form of occurrence is the voltage fluctuation problem. Voltage fluctuations are considered to be one of the most serious of the many power quality issues that affect the proper operation of a powered device.
Voltage sag (voltage sag), also called voltage sag, is a phenomenon that the effective value of the rated operating voltage of the system suddenly drops within a few seconds or even a few milliseconds and then returns to a normal state. In the south Africa national Standard NRS 048-2: 2003: the user side electrical equipment is required to have the immunity level capable of bearing long-term operation of 150ms, 80% 600ms and 80% when the voltage fluctuates to 70%, and the frequency of voltage fluctuation of a power grid is also regulated. The conventional scheme for solving the problem of voltage fluctuation is such as adopting a standby power supply for fast switching, an Uninterruptible Power Supply (UPS), a dynamic voltage restorer, a multifunctional voltage instantaneous compensation device and the like, or the problems of not fast enough action, large loss, low efficiency, insufficient economy and the like.
The energy storage system has the characteristics of accurate power control and quick response, and participates in power grid voltage regulation, the charging and discharging reactive power only occupies PCS capacity, and active power is not consumed.
Disclosure of Invention
The invention provides an energy storage voltage regulation control method and device considering power factors of a power grid, and aims to solve the problems of voltage fluctuation and the like of the power grid by utilizing the characteristics of bidirectional reactive power flow and accurate control of an energy storage system. By detecting the operation parameters of the power grid and considering the states of the power grid operation power factor and the like, the energy storage system is controlled to charge and discharge reactive power, the voltage fluctuation problems of the power grid voltage fluctuation and the like are solved, the purposes of improving the voltage stability of the power grid, improving the power supply electric energy quality and improving the power supply economy are achieved, meanwhile, the application scene of energy storage is widened to a certain extent, and the application economy is extended.
The technical scheme provided by the invention is as follows:
an energy storage voltage regulation control method considering power factors of a power grid comprises the following steps:
step 1: the battery energy storage system controlled by the PCS device is merged into a power grid through a breaker and a transformer;
step 2: collecting power grid operation data including power grid reference voltage value U in real time N Voltage U of grid-connected point stored energy corresponding to i moment ppci Self voltage U of energy storage system bi Power factor lambda i ；
And step 3: according to the energy storage grid-connected point voltage U acquired in real time in the step 2 ppci Self voltage U of battery energy storage system bi Power factor λ i And the reference voltage value U of the power grid N Judging the power grid demand state, and if the voltage fluctuates, determining the action of the battery energy storage system according to the voltage fluctuation conditionThe mode, the output direction and the output magnitude, if the voltage is in a normal state, returning to the step 2 to enter the next detection period;
and 4, step 4: according to the action area of the battery energy storage system participating in the power grid voltage regulation and the theoretical voltage regulation instruction Q bi And maximum value Q of output limit value of power supply in normal operation in battery energy storage system bmax Minimum value Q bmin Determining the actual output value Q of the battery energy storage system for voltage regulation at the corresponding moment Bi ；
And 5: according to actual output value Q of voltage regulation corresponding to power supply in battery energy storage system Bi And the output power of the power supply in the battery energy storage system is controlled, so that the power supply in the battery energy storage system is charged/discharged, and the coordination control of the voltage regulation of the power grid is completed.
λ i The value range is [0, 1 ] for the power factor of the power grid]The power grid operation state detection can be directly acquired and obtained in general, and is substantially the ratio of the power grid operation active power P to the power grid apparent power S, namely lambda i P/S, wherein S 2 ＝P 2 +Q 2 And Q is the reactive power of the power grid. In fact, in the case of outputting the same active power, the power factor of the grid is increased, the reactive current can be reduced, and therefore the power loss generated by the reactive current on the line resistance can be reduced. Therefore, the control coefficient of the energy storage participating in voltage regulation is determined by considering the power factor of the power grid, and the economic operation of the power grid is facilitated.
Further, the power grid demand state and the energy storage self state are judged according to the data collected by the data real-time collecting unit, and the energy storage action mode, the output direction and the output size are determined, wherein the specific process comprises the following steps:
energy storage action mode and force output direction:
(1) if U is ppci ＝U bi If the energy storage is normal grid connection, the charging and discharging actions can be normally carried out;
1) when U is turned ppci ＞U N When the voltage is higher, the reactive power of the power grid is surplus; need to store energy to absorb reactive power, make Q bi The direction of the energy storage power generation force is the direction of the energy storage absorption and storage reactive power to reduce the voltage;
2) when U is turned ppci ＜U N When the voltage is low, the reactive power shortage of the power grid occurs; need to store energy to make reactive power compensation, make Q bi The direction of the energy storage power output force is positive, and the energy storage power output force is used for storing energy and releasing reactive power so as to improve voltage;
3) when U is turned ppci ＝U N When the energy storage device is used, the voltage condition is good, and the direction of the energy storage power is the energy storage power without action;
(2) if U is ppci ≠U bi If the energy storage is not normally connected to the grid, the maintenance is needed, and the charging and discharging actions cannot be carried out;
the action mode is a discharging action or a charging action, which is equivalent to determining the sign of an action value;
the magnitude of the output of the energy storage action, i.e. the theoretical voltage-regulating command Q bi The specific calculation method is as follows:
Q bi ＝K×ΔU i ，ΔU i ＝U ppci -U N ，K＝1/λ i ×K 1
wherein, K 1 Is constant and has a value range of 1.1-1.3.
The voltage and the reactive power are directly related in the operation of the power grid, the reactive power flows from a node with high voltage to a node with low voltage, usually, when the voltage of the node of the power grid drops, the node has reactive vacancy, and related measures are needed to be taken to inject the reactive power, such as a parallel capacitor and the like. When the grid voltage rises (i.e. Δ U) i When the voltage is higher than 0), the energy storage system stores the absorbed partial reactive power, so that the reactive power at the node is reduced, and the voltage is reduced; when the grid voltage rises (i.e. Δ U) i <When 0), the energy storage system releases and injects part of reactive power absorbed and stored before into the power grid, so that the reactive power at the node is improved, the voltage is improved, and the effect of regulating the voltage is achieved;
Q bi representing theoretical voltage regulation commands, i.e.Reactive power being a theoretical contribution of an energy-storing power supply, wherein Q bi To be positive for absorption, Q bi Negative means release;
further, when the minimum output capacity limit and the maximum output capacity limit of the battery energy storage system are within the range, the actual output value Q of the power supply in the battery energy storage system for regulating voltage at the corresponding moment Bi Determined by the following formula:
Figure GDA0003771226340000031
wherein Q is bmin 、Q bmax Corresponding to the practical minimum output capacity limit and the practical maximum output capacity limit of the battery energy storage system.
On the other hand, the energy storage voltage regulation control device considering the power factor of the power grid comprises a grid-connected unit, a data real-time acquisition unit, a judgment unit, an operation unit and an output unit which are sequentially connected, wherein the grid-connected unit is used for merging the battery energy storage system into the power grid, the data real-time acquisition unit is used for acquiring voltage information, the judgment unit is used for judging the demand state of the power grid, the action mode and the output direction of the battery energy storage system, and the operation unit is used for calculating to obtain a power instruction; and then the output unit outputs compensation current sent by an inverter circuit consisting of a power electronic inverter circuit to charge/discharge a power supply in the battery energy storage system, so that the coordination control of power grid voltage regulation is completed.
Further, the grid-connected unit incorporates a battery energy storage system controlled by the PCS device into the grid through a breaker and a transformer.
Furthermore, the data real-time acquisition unit is used for acquiring power grid operation data in real time, and the power grid operation data comprises a power grid reference voltage value U N Voltage U of grid-connected point stored energy corresponding to i moment ppci Self-voltage U of energy storage system bi Power factor λ i.
Furthermore, the judging unit judges the power grid demand state and the energy storage self state according to the data acquired by the data real-time acquisition unit, and determines the energy storage action mode, the output direction and the output size, and the specific process is as follows:
energy storage action mode and force output direction:
(1) if U is ppci ＝U bi If the energy storage is normal grid connection, the charging and discharging actions can be normally carried out;
1) when U is turned ppci ＞U N When the voltage is higher, the reactive power of the power grid is surplus; need to store energy to absorb reactive power, make Q bi The direction of the energy storage power generation force is the direction of the energy storage absorption and storage reactive power to reduce the voltage;
2) when U is turned ppci ＜U N When the voltage is low, the reactive power shortage of the power grid occurs; need to store energy to make reactive power compensation, make Q bi The direction of the energy storage power output force is positive, and the energy storage power output force is used for storing energy and releasing reactive power so as to improve voltage;
3) when U is turned ppci ＝U N When the energy storage device is used, the voltage condition is good, and the direction of the energy storage power is that the energy storage does not need to be operated;
(2) if U is ppci ≠U bi If the energy storage is not normally connected to the grid, the maintenance is needed, and the charging and discharging actions cannot be carried out;
the magnitude of the output of the energy storage action, i.e. the theoretical voltage-regulating command Q bi The specific calculation method is as follows:
Q bi ＝K×ΔU i ，ΔU i ＝U ppci -U N ，K＝1/λ i ×K 1
wherein, K 1 Is constant and has a value range of 1.1-1.3.
Further, when the operation unit is within the minimum output capacity limit and the maximum output capacity limit of the battery energy storage system, the actual output value Q of the power supply in the battery energy storage system for regulating voltage at the corresponding moment Bi Calculated according to the following formula:
Figure GDA0003771226340000041
wherein Q is bmin 、Q bmax The minimum output capacity limit and the maximum output capacity limit of the battery energy storage system correspond to each other.
In yet another aspect, a readable storage medium includes computer program instructions, which when executed by a processing terminal, cause the processing terminal to perform the above-mentioned energy storage and voltage regulation control method considering the power factor of the power grid.
Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
the invention solves the problems of power grid voltage regulation and voltage fluctuation by using the energy storage system, and aims to provide a method for improving the problems of power grid voltage fluctuation and the like by using the energy storage system to participate in the power grid voltage regulation. By detecting the operation parameters of the power grid and considering the states of the power grid operation power factor and the like, the energy storage system is controlled to charge and discharge reactive power, the voltage fluctuation problems of the power grid voltage fluctuation and the like are improved, the voltage stability of the power grid is improved, the qualitative relation between the power factor and the node voltage variation trend is mainly utilized, and a corresponding quantitative relation adjusting function (Q) is established bi ＝K×ΔU i ) Therefore, the magnitude of the reactive charge and discharge power value of the energy storage is controlled, a quantitative relation is established, the operation of the energy storage system is simply and visually controlled, the purposes of improving the quality of power supply electric energy and improving the power supply economy are achieved, meanwhile, the application scene of the energy storage is widened to a certain extent, the application economy is extended, the characteristics of rapid battery energy storage action and accurate power bidirectional charge and discharge control are achieved, and the transient state performance and the steady state performance of power grid voltage regulation are improved.
Drawings
Fig. 1 is a flowchart of a control method according to an embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the following figures and examples.
As shown in fig. 1, an energy storage voltage regulation control method considering power factor of a power grid includes the following steps:
step 1: the battery energy storage system controlled by the PCS device is merged into a power grid through a circuit breaker and a transformer;
step 2: collecting power grid operation data including power grid reference voltage value U in real time N When corresponding to iEnergy-storing grid-connected point voltage U ppci Self voltage U of energy storage system bi Power factor lambda i ；
And 3, step 3: according to the energy storage grid-connected point voltage U acquired in real time in the step 2 ppci Self voltage U of battery energy storage system bi Power factor λ i And the reference voltage value U of the power grid N Judging the power grid demand state, if the voltage fluctuates, determining the action mode, the output direction and the output magnitude of the battery energy storage system according to the voltage fluctuation condition, and if the voltage is in a normal state, returning to the step 2 to enter the next detection period;
reference voltage value U of power grid N Determining according to the voltage grade of the grid-connected point;
λ i the value range is [0, 1 ] for the power factor of the power grid]In the detection of the grid operating state, the value can be read directly, which is essentially the ratio of the grid operating active power P to the grid apparent power S, i.e. λ i P/S, wherein S 2 ＝P 2 +Q 2 And Q is the reactive power of the power grid. In fact, when the same active power is output, the power factor of the power grid is improved, the reactive current can be reduced, and therefore the power loss generated by the reactive current on the line resistor can be reduced. Therefore, the control coefficient of the energy storage participating in voltage regulation is determined by considering the power factor of the power grid, and the economic operation of the power grid is facilitated.
The method comprises the following steps of judging the power grid demand state and the energy storage self state according to data collected by a data real-time collecting unit, and determining the energy storage action mode, the output direction and the output size, wherein the specific process comprises the following steps:
judging the power grid demand state and the energy storage self state, and determining the energy storage action mode and the output direction:
(1) if U is ppci ＝U bi If the energy storage is normal grid connection, the charging and discharging actions can be normally carried out;
1) when U is turned ppci ＞U N When the voltage is higher, the reactive power of the power grid is surplus; reactive power absorption is carried out by energy storage, so that Q is bi The direction of the energy storage power generation force is the direction of the energy storage absorption and storage reactive power to reduce the voltage;
2) when U is formed ppci ＜U N When the voltage is low, the reactive power shortage of the power grid occurs; need to store energy to make reactive power compensation, make Q bi The direction of the energy storage power output force is positive, and the energy storage power output force is used for storing energy and releasing reactive power so as to improve voltage;
3) when U is turned ppci ＝U N When the energy storage device is used, the voltage condition is good, and the direction of the energy storage power is that the energy storage does not need to be operated;
(2) if U is ppci ≠U bi If the energy storage is not normally connected to the grid, the maintenance is needed, and the charging and discharging actions cannot be carried out;
the action mode is a discharging action or a charging action, which is equivalent to determining the sign of an action value;
the magnitude of the output of the energy storage action, i.e. the theoretical voltage-regulating command Q bi The specific calculation method is as follows:
Q bi ＝K×ΔU i ，ΔU i ＝U ppci -U N ，K＝1/λ i ×K 1
wherein, K 1 Is constant and has a value range of 1.1-1.3.
The voltage and the reactive power are directly related in the operation of the power grid, the reactive power flows from a node with high voltage to a node with low voltage, under the common condition, when the voltage of the node of the power grid drops, the node has reactive vacancy, related measures are required to be taken to inject the reactive power, such as a parallel capacitor and the like, but the traditional reactive injection mode has the characteristics of discontinuous reactive power regulation and the like, and in a system containing energy storage, the reactive power charging and discharging capacity of the energy storage is considered to be utilized to supplement or absorb the reactive power for the power grid. When the grid voltage rises (i.e. Δ U) i When the voltage is higher than 0), the energy storage system stores the absorbed partial reactive power, so that the reactive power at the node is reduced, and the voltage is reduced; when the grid voltage rises (i.e. Δ U) i <When 0), the energy storage system releases and injects part of reactive power absorbed and stored before into the power grid, so that the reactive power at the node is improved, the voltage is improved, and the effect of regulating the voltage is achieved;
Q bi representing theoretical voltage-regulating commands, i.e. of energy-storing power supplyReactive power of theoretical action, in which Q bi To be positive for absorption, Q bi Negative indicates release;
when the minimum output capacity limit and the maximum output capacity limit of the battery energy storage system are within the range, the actual output value Q of the power supply in the battery energy storage system for regulating voltage at the corresponding moment Bi Determined by the following formula:
Figure GDA0003771226340000061
wherein Q is bmin 、Q bmax And the actual minimum output capacity limit and the actual maximum output capacity limit of the battery energy storage system are corresponded.
And 4, step 4: according to the action area of the battery energy storage system participating in the power grid voltage regulation and the theoretical voltage regulation instruction Q bi And maximum value Q of output limit value of power supply in normal operation in battery energy storage system bmax Minimum value Q bmin Determining the actual output value Q of the battery energy storage system for voltage regulation at the corresponding moment Bi ；
And 5: according to actual output value Q of voltage regulation corresponding to power supply in battery energy storage system Bi And the output power of the power supply in the battery energy storage system is controlled, so that the power supply in the battery energy storage system is charged/discharged, and the coordination control of the voltage regulation of the power grid is completed.
The embodiment of the invention also provides an energy storage voltage regulation control method and device considering the power factor of the power grid, which comprises a grid-connected unit, a data real-time acquisition unit, a judgment unit, an operation unit and an output unit which are sequentially connected, wherein the grid-connected unit is used for merging the battery energy storage system into the power grid, the data real-time acquisition unit is used for acquiring voltage information, the judgment unit is used for judging the demand state of the power grid, the action mode and the output direction of the battery energy storage system, and the operation unit is used for calculating to obtain a power instruction; and then the output unit outputs compensation current sent by an inverter circuit consisting of a power electronic inverter circuit to charge/discharge a power supply in the battery energy storage system, so that the coordination control of power grid voltage regulation is completed.
And the grid-connected unit is used for connecting a battery energy storage system controlled by the PCS device into a power grid through a breaker and a transformer.
The data real-time acquisition unit is used for acquiring power grid operation data in real time, and comprises a power grid reference voltage value U N Voltage U of grid-connected point stored energy corresponding to i moment ppci Self voltage U of energy storage system bi Power factor lambda i 。
The judging unit judges the power grid demand state and the energy storage self state according to the data acquired by the data real-time acquisition unit, and determines the energy storage action mode, the output direction and the output size, and the specific process is as follows:
energy storage action mode and force output direction:
(1) if U is present ppci ＝U bi If the energy storage is normal grid connection, the charging and discharging actions can be normally carried out;
1) when U is turned ppci ＞U N When the voltage is higher, the reactive power of the power grid is surplus; need to store energy to absorb reactive power, make Q bi The direction of the energy storage power generation force is the direction of the energy storage absorption and storage reactive power to reduce the voltage;
2) when U is turned ppci ＜U N When the voltage is low, the reactive power shortage of the power grid occurs; need to store energy to perform reactive power compensation, make Q bi The direction of the energy storage power output force is positive, and the energy storage power output force is used for storing energy and releasing reactive power so as to improve voltage;
3) when U is turned ppci ＝U N When the energy storage device is used, the voltage condition is good, and the direction of the energy storage power is that the energy storage does not need to be operated;
(2) if U is ppci ≠U bi If the energy storage is not normally connected to the grid, the maintenance is needed, and the charging and discharging actions cannot be carried out;
the action mode is a discharging action or a charging action, which is equivalent to determining the sign of an action value;
the magnitude of the output of the energy storage action, i.e. the theoretical voltage-regulating command Q bi The specific calculation method is as follows:
Q bi ＝K×ΔU i ，ΔU i ＝U ppci -U N ，K＝1/λ i ×K 1
wherein, K 1 Is constant and has a value range of 1.1-1.3.
When the operation unit is within the minimum output capacity limit and the maximum output capacity limit of the battery energy storage system, the actual output value Q of the power supply in the battery energy storage system for regulating voltage at the corresponding moment Bi Calculated according to the following formula:
Figure GDA0003771226340000071
wherein Q is bmin 、Q bmax The minimum output capacity limit and the maximum output capacity limit of the battery energy storage system correspond to each other.
The embodiment of the invention also provides a readable storage medium, which comprises computer program instructions, and when the computer program instructions are executed by a processing terminal, the processing terminal executes the energy storage and voltage regulation control method considering the power factor of the power grid.
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 the like) 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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (5)

1. An energy storage voltage regulation control method considering power factors of a power grid is characterized by comprising the following steps:
step 1: the battery energy storage system controlled by the PCS device is merged into a power grid through a breaker and a transformer;
step 2: collecting power grid operation data including power grid reference voltage value U in real time N Voltage U of grid-connected point stored energy corresponding to i moment ppci Self-voltage U of energy storage system bi Power factor lambda i ；
And step 3: according to step 2Real-time collected energy storage grid-connected point voltage U ppci Self voltage U of battery energy storage system bi Power factor λ i And the reference voltage value U of the power grid N Judging the power grid demand state, if the voltage fluctuates, determining the action mode, the output direction and the output magnitude of the battery energy storage system according to the voltage fluctuation condition, and if the voltage is in a normal state, returning to the step 2 to enter the next detection period;
the method comprises the following steps of judging the power grid demand state and the energy storage self state according to data collected by a data real-time collecting unit, and determining the energy storage action mode, the output direction and the output size, wherein the specific process comprises the following steps:
energy storage action mode and force output direction:
(1) if U is present ppci ＝U bi If the energy storage is normal grid connection, the charging and discharging actions can be normally carried out;
1) when U is turned ppci ＞U N When the voltage is higher, the reactive power of the power grid is surplus; reactive power absorption is carried out by energy storage, so that Q is bi The direction of the energy storage power generation force is the direction of the energy storage absorption and storage reactive power to reduce the voltage;
2) when U is turned ppci ＜U N When the voltage is low, the reactive power shortage of the power grid occurs; need to store energy to make reactive power compensation, make Q bi The direction of the energy storage power output force is positive, and the energy storage power output force is used for storing energy and releasing reactive power so as to improve voltage;
3) when U is turned ppci ＝U N When the energy storage device is used, the voltage condition is good, and the direction of the energy storage power is that the energy storage does not need to be operated;
(2) if U is present ppci ≠U bi If the energy storage is not normally connected to the grid, the maintenance is needed, and the charging and discharging actions cannot be carried out;
the magnitude of the output of the energy-storage action, i.e. the theoretical voltage-regulating instruction Q bi The specific calculation method is as follows:
Q bi ＝K×ΔU i ，ΔU i ＝U ppci -U N ，K＝1/λ i ×K 1
wherein, K 1 Is constant and has a value range of 1.1-1.3;
and 4, step 4: according to the action area of the battery energy storage system participating in the power grid voltage regulation and the theoretical voltage regulation instruction Q bi And maximum value Q of output limit value of power supply in normal operation in battery energy storage system bmax Minimum value Q bmin Determining the actual output value Q of the battery energy storage system for voltage regulation at the corresponding moment Bi ；
And 5: according to actual output value Q of voltage regulation corresponding to power supply in battery energy storage system Bi And the output power of the power supply in the battery energy storage system is controlled, so that the power supply in the battery energy storage system is charged/discharged, and the coordination control of the voltage regulation of the power grid is completed.
2. The method of claim 1, wherein the actual output value Q of the battery energy storage system corresponding to the moment voltage regulation is within a range of a minimum output capacity limit and a maximum output capacity limit of the battery energy storage system Bi Determined by the following formula:
Figure FDA0003771226330000021
wherein Q is bmin 、Q bmax Corresponding to the practical minimum output capacity limit and the practical maximum output capacity limit of the battery energy storage system.
3. An energy storage voltage regulation control device considering power factors of a power grid is characterized by comprising a grid-connected unit, a data real-time acquisition unit, a judgment unit, an operation unit and an output unit which are sequentially connected, wherein a battery energy storage system is connected into the power grid by the grid-connected unit, voltage information is acquired by the data real-time acquisition unit, the judgment unit judges the demand state of the power grid, the action mode and the output direction of the battery energy storage system, and a power instruction is obtained by calculation of the operation unit; then, the output unit outputs compensation current sent by an inverter circuit consisting of a power electronic inverter circuit, and the compensation current charges/discharges a power supply in a battery energy storage system to complete coordination control of power grid voltage regulation;
the grid-connected unit is used for connecting a battery energy storage system controlled by the PCS device into a power grid through a circuit breaker and a transformer;
the data real-time acquisition unit is used for acquiring power grid operation data in real time, and comprises a power grid reference voltage value U N Voltage U of grid-connected point stored energy corresponding to i moment ppci Self voltage U of energy storage system bi Power factor lambda i (ii) a The judging unit judges the power grid demand state and the energy storage self state according to the data acquired by the data real-time acquisition unit, and determines the energy storage action mode, the output direction and the output size, and the specific process is as follows:
energy storage action mode and force output direction:
(1) if U is ppci ＝U bi If the energy storage is normal grid connection, the charging and discharging actions can be normally carried out;
1) when U is turned ppci ＞U N When the voltage is higher, the reactive power of the power grid is surplus; reactive power absorption is carried out by energy storage, so that Q is bi The direction of the energy storage power generation force is the direction of the energy storage absorption and storage reactive power to reduce the voltage;
2) when U is turned ppci ＜U N When the voltage is low, the reactive power shortage of the power grid occurs; need to store energy to perform reactive power compensation, make Q bi The direction of the energy storage power output force is positive, and the energy storage power output force is used for storing energy and releasing reactive power so as to improve voltage;
3) when U is formed ppci ＝U N When the energy storage device is used, the voltage condition is good, and the direction of the energy storage power is the energy storage power without action;
(2) if U is ppci ≠U bi If the energy storage is not normally connected to the grid, the maintenance is needed, and the charging and discharging actions cannot be carried out;
the magnitude of the output of the energy storage action, i.e. the theoretical voltage-regulating command Q bi The specific calculation method is as follows:
Q bi ＝K×ΔU i ，ΔU i ＝U ppci -U N ，K＝1/λ i ×K 1
wherein, K 1 Is constant and has a value range of 1.1-1.3.
4. The device of claim 3, wherein the computing unit is configured to calculate the actual output value Q of the power supply in the battery energy storage system corresponding to the instant voltage regulation when the minimum output capacity limit and the maximum output capacity limit of the battery energy storage system are within the range Bi Calculated according to the following formula:
Figure FDA0003771226330000031
wherein Q is bmin 、Q bmax The minimum output capacity limit and the maximum output capacity limit of the battery energy storage system correspond to each other.
5. A readable storage medium comprising computer program instructions characterized in that: the computer program instructions, when executed by a processing terminal, cause the processing terminal to perform the method of any of claims 1 to 2.
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