CN111049167B - Energy storage system power control method and system - Google Patents
Energy storage system power control method and system Download PDFInfo
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- CN111049167B CN111049167B CN201811186537.6A CN201811186537A CN111049167B CN 111049167 B CN111049167 B CN 111049167B CN 201811186537 A CN201811186537 A CN 201811186537A CN 111049167 B CN111049167 B CN 111049167B
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- Y02E40/30—Reactive power compensation
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention provides a power control method and a power control system for an energy storage system, wherein the power control method comprises the following steps: acquiring a power grid frequency and voltage index, an initial power scheduling instruction, application scenes capable of participating in scheduling and priorities of the application scenes; when the power grid frequency voltage index is out of limit, the energy storage system adjusts power based on the application scene priority and the state of the energy storage system; otherwise, the energy storage system adjusts the power based on the initial power scheduling instruction issued by the power grid, so that the controllability of the energy storage system and the flexible access of the energy storage system are enhanced, the ordered echelon participation of the multiple types of energy storage batteries with multiple capacities in various operation scenes of the power grid is realized through the priority setting of the application scenes, and the disturbance-resistant operation capability of the power grid is enhanced.
Description
The technical field is as follows:
the invention belongs to the field of energy storage system control, and particularly relates to a power control method and system for an energy storage system.
Background art:
energy storage is an inevitable choice for the development of the future power industry, and is an indispensable role in the future power system due to the requirements in the aspects of large-scale consumption of renewable energy, power peak regulation and frequency modulation, friendly access of distributed energy, user-side demand response, friendly interaction of electric vehicles and power grids and the like. Under the background of large-scale application of energy storage, the grid connection of an energy storage system brings great challenges to the primary grid structure, automation control and management level of a power distribution network. The method comprises the steps of switching the energy storage system from an off-grid state to an isolated island state, switching from a grid-connected state to a grid-connected state, reconfiguring a distribution network grid frame during grid-connected operation, switching between different consumption modes, changing a primary network structure during off-grid isolated island operation and the like, which cause polymorphism of the operation of a distribution network, how to realize flexible and effective control of a battery energy storage system or other controllable resources, and realizing self-adaptive smooth switching and stable operation of the energy storage system operation modes under different operation states of the distribution network, and is one of the difficulties of energy storage system grid-connected coordination control technology.
The invention content is as follows:
in order to overcome the above-mentioned drawbacks, the present invention provides a power control method for an energy storage system, the method comprising:
acquiring a power grid frequency and voltage index, an initial power scheduling instruction, application scenes capable of participating in scheduling and priorities of the application scenes;
when the grid frequency voltage index is out of limit, the energy storage system adjusts power based on the application scene priority and the state of the energy storage system;
otherwise, the energy storage system adjusts the power based on the initial power scheduling instruction issued by the power grid.
Preferably, when the grid frequency voltage indicator is out of limit, the energy storage system performs power adjustment based on the application scenario priority and the state of the energy storage system, including:
when the grid frequency voltage index is out of limit, selecting an application scene based on the current self-reported state information of the energy storage system;
selecting an adaptive adjustment control or initial power scheduling instruction according to the priority corresponding to the application scene, and executing the instruction;
after the instruction is executed, judging whether the power grid frequency voltage index returns to normal, if not, adjusting all energy storage systems to be at the maximum power until the power grid frequency voltage index returns to normal;
when the index returns to normal, the adaptive regulation control is quitted according to the priority order, and an initial power scheduling instruction is executed;
the application scene priority comprises the following steps from high to low: priority a, priority B, and priority C.
Preferably, the selecting and executing the adaptive regulation control or the initial power scheduling command according to the priority of the energy storage system includes:
when the application scene of the energy storage system is priority A, the energy storage system immediately executes adaptive adjustment control;
when the application scene of the energy storage system is priority B, whether the frequency and voltage indexes of the power grid return to normal or not is detected again after a preset time period is delayed; if the power grid frequency voltage index returns to normal, the energy storage system keeps an initial power scheduling instruction; otherwise, the energy storage system immediately executes self-adaptive adjustment control;
when the application scene of the energy storage system is priority C, the energy storage system executes an initial power scheduling instruction;
the preset time period is the adjusting time of the energy storage system for executing the priority A.
Preferably, the energy storage system immediately performs adaptive regulation control, including:
acquiring the power grid frequency based on a preset time interval, and calculating the frequency change rate of all frequency sampling points according to time;
calculating a power adjustment amount based on a current frequency change amount when the calculated frequency change rate is less than 0 and less than a previous frequency change rate;
when the calculated frequency change rate is less than 0 and not less than the previous frequency change rate, adjusting based on the previous power adjustment amount;
when the calculated frequency change rate is not less than 0 and the frequency change rates of the continuous frequency sampling points are all greater than 0, calculating a power adjustment amount according to a droop control type or performing power adjustment based on an initial power scheduling instruction;
and when the calculated frequency change rate is not less than 0 and less than a preset frequency change rate, the energy storage system outputs and detects the power grid frequency voltage index with the maximum power until the working operation condition is met, and the droop control is carried out to calculate the power adjustment amount.
Preferably, the frequency change rate is calculated as follows:
in the formula, k i Is the rate of change of frequency; t is t i Is the ith sampling moment; f. of i The frequency of the ith sampling moment; t is t i-1 The sampling time is the previous sampling time of the ith sampling time; f. of i-1 The frequency of the sampling instant preceding the ith sampling instant.
Preferably, the calculation formula for calculating the power adjustment amount based on the current frequency variation is as follows:
in the formula, P o Is a power adjustment; p ref Scheduling the command power value; k is the droop coefficient of the energy storage system; t is t m Maximum fall time for the set frequency; t is t 0 Actively supporting the power grid frequency response time for the system; k is a radical of i Is the rate of change of frequency.
Preferably, the calculation formula for calculating the power adjustment amount according to the droop control type is as follows:
P o ＝P ref +K(f i -f i-1 )
in the formula, P ref Scheduling the command power value; k is the droop coefficient of the energy storage system; f. of i The frequency of the ith sampling moment; f. of i-1 The frequency of the sampling instant preceding the ith sampling instant.
Preferably, after the indicator returns to normal, the adaptive power scheduling control exits according to the priority order, and the executing of the initial power scheduling instruction includes:
and if the grid frequency voltage index returns to normal, preferentially quitting the priority B, then quitting the priority A, and executing an initial power scheduling instruction by the energy storage system.
Preferably, the acquiring of the grid frequency voltage index, the initial power scheduling instruction, the application scenarios that can participate in scheduling, and the priority of each application scenario further includes:
establishing a communication relation between a power grid and an energy storage system based on a plug-and-play physical interface;
the energy storage system sends self state information and application scenes which can participate in scheduling to the power grid based on the communication relation;
wherein the plug-and-play physical interface comprises: the power interface and the communication interface are integrated into a whole interface.
Preferably, the status information includes:
the method comprises the following steps of accessing the energy storage system into a power grid mode, outputting voltage of the energy storage system, battery type, remaining energy of an energy storage battery pack, maximum allowable charge and discharge power and duration of the battery pack and reactive compensation capacity of the energy storage system.
Preferably, the application scenario that can participate in scheduling includes:
peak clipping and valley filling, frequency modulation, power fluctuation stabilization, reactive compensation and harmonic wave treatment.
An energy storage system power control system, the system comprising:
an acquisition module: the method comprises the steps of obtaining a power grid frequency voltage index, an initial power scheduling instruction, application scenes capable of participating in scheduling and application scene priorities;
a first adjustment module: the energy storage system is used for carrying out power regulation based on the application scene priority and the state of the energy storage system when the grid frequency voltage index is out of limit;
a second adjustment module: and the power regulating module is used for regulating the power of the energy storage system based on the initial power dispatching instruction issued by the power grid.
Preferably, the first adjusting module includes: the device comprises a first selection unit, a second selection unit, a judgment unit and an exit unit;
the first selection unit is used for selecting an application scene based on the current self-reported state information of the energy storage system when the frequency and voltage indexes of the power grid are out of limit;
the second selection unit is used for selecting an adaptive adjustment control or initial power scheduling instruction according to the priority corresponding to the application scene and executing the instruction;
the judging unit is used for judging whether the power grid frequency voltage index returns to normal after the instruction is executed, and if not, adjusting all energy storage systems to be at the maximum power until the power grid frequency voltage index returns to normal;
the exit unit is used for exiting the adaptive regulation and control according to the priority order and executing the initial power scheduling instruction after the index returns to normal;
the application scene priority comprises the following steps from high to low: priority a, priority B, and priority C.
Compared with the prior art, the invention has the following beneficial effects:
1. the power control method of the energy storage system provided by the invention comprises the steps of obtaining a power grid frequency voltage index, an initial power scheduling instruction, application scenes capable of participating in scheduling and priorities of the application scenes; when the power grid frequency voltage index is out of limit, the energy storage system adjusts power based on the application scene priority and the state of the energy storage system; otherwise, the energy storage system adjusts the power based on the initial power scheduling instruction issued by the power grid, so that the controllability of the energy storage system and the flexible access of the energy storage system are enhanced, the ordered echelon participation of the multiple types of energy storage batteries with multiple capacities in various operation scenes of the power grid is realized through the priority setting of the application scenes, and the disturbance-resistant operation capability of the power grid is enhanced.
2. The power control method of the energy storage system provided by the invention can effectively improve the consumption of the power distribution network on various distributed power supplies under the condition of avoiding the large-scale transformation of the current network frame, can form a good interaction mechanism of the power distribution network and the distributed power supplies, enhances the active supporting effect of the distributed power supplies on the operation of the power distribution network, adjusts the output power of the energy storage system by using the frequency change rate at the initial stage of the power grid change frequency, can play a good supporting effect on the transient change process of the power grid frequency, and reduces the transient decline or increase of the frequency.
Description of the drawings:
FIG. 1 is a flow chart of a method for power control of an energy storage system according to the present invention;
FIG. 2 is a flow chart of the adaptive throttling of the plug-and-play energy storage system of the present invention;
FIG. 3 is a PQ grid power control strategy diagram of the present invention;
FIG. 4 is a block diagram of the primary frequency modulation response control of the energy storage system of the present invention;
FIG. 5 is a diagram illustrating the control of the primary frequency modulation active support of the energy storage system during the frequency reduction of the present invention.
The specific implementation mode is as follows:
for better understanding of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments.
Example 1: the specific implementation steps of the invention as shown in fig. 1 are as follows:
the method comprises the following steps: acquiring a power grid frequency and voltage index, an initial power scheduling instruction, application scenes capable of participating in scheduling and priorities of the application scenes;
step two: when the power grid frequency voltage index is out of limit, the energy storage system adjusts power based on the application scene priority and the state of the energy storage system;
step three: otherwise, the energy storage system adjusts the power based on the initial power scheduling instruction issued by the power grid.
According to the invention, the plug-and-play technology is applied to the energy storage system, so that the interaction capacity of various energy storage systems and the power grid can be enhanced, the power grid can preset the operation mode of the energy storage system according to the self-description of the energy storage system and in combination with the model, and the control capacity of the energy storage system is enhanced. The plug-and-play type energy storage system has certain self-adaptive power-saving capability of a power grid, can actively carry out supporting response when certain indexes of the power grid are abnormal, and flexibly switches the operation mode. In addition, the new active support power grid frequency response control method can effectively reduce the initial transient change amplitude of the power grid frequency and enhance the support effect of the energy storage system on the power grid.
The method comprises the following steps: acquiring a power grid frequency and voltage index, an initial power scheduling instruction, application scenes capable of participating in scheduling and priorities of the application scenes;
the distributed energy storage system is connected with a power grid in a primary power and information communication mode through a general physical interface technology, a low-voltage auxiliary power supply supplies power to a control circuit of the energy storage system, and communication relation is established between the energy storage system and the power grid. The energy storage system communicates various current state information and participatory power grid application scenes to the distribution network automatic management system, then waits for the power grid to issue an operation instruction, and operates according to the instruction.
The process of accessing the energy storage system with plug and play function to the power grid is shown in fig. 2, and first, the connection of primary power and information communication is realized with the power grid through a universal physical interface. After the energy storage system establishes communication with the distribution network automation system, the energy storage system reports the state information of the energy storage system to the power network: the method comprises the following steps of accessing a power grid mode, the output voltage of an energy storage system, the battery type, the energy-generating capacity of an energy storage battery pack, the allowed maximum charge-discharge power and duration of the battery pack, the reactive compensation capacity of the energy storage system and the like, and the power grid application scene in which the energy storage system can participate includes: peak clipping and valley filling, frequency modulation, power fluctuation stabilization, reactive compensation and the like. And the distribution network automation system obtains the instruction power of the energy storage system and the corresponding application scene self-adaptive regulation priority through model calculation according to the real-time energy storage type and the capacity transmitted by the energy storage system. ABC three-level priorities can be set, and the privileges of participating application scenarios are in turn in a decreasing trend. The energy storage system with the layer A priority has enough capacity and capacity to participate in the application scene for self-adaptive power and energy regulation; the B-layer priority energy storage system has the capacity of participating in adaptive power and energy regulation of the application scene but has limited capacity; the energy storage system with the priority of the C layer is not suitable for self-adaptive power and energy regulation in the application scene. The energy storage system with the layer A priority can start the self-adaptive adjustment function immediately after the indexes of the power grid are out of limit, and actively support and respond to the power grid; the energy storage system of the B layer of priority detects the index of the power grid again after the delay t, if the index of the power grid returns to normal or has a stable trend of returning to normal, the energy storage system of the B layer of priority does not execute the adaptive adjustment function and keeps the original running state, otherwise, the energy storage system of the B layer of priority executes the adaptive adjustment control strategy to enhance the support capability of the power grid; the energy storage system with the priority of the C layer does not allow adaptive adjustment in the application scene.
The universal physical interface of the energy storage system with the plug-and-play function integrates a power interface and a communication interface, and has certain universality and convenience. The state information uploaded to the distribution network automatic management system by the energy storage system mainly comprises the mode of the energy storage system accessing to a power grid, the output voltage of the energy storage system, the type of a battery, the residual energy available in an energy storage battery pack, the maximum allowable charge and discharge power and duration of the battery pack, the reactive compensation capacity of the energy storage system and the like. The application scenes uploaded by the energy storage system and capable of participating in the power grid comprise: peak clipping and valley filling, frequency modulation, power fluctuation stabilization, reactive compensation, harmonic wave treatment and the like. After finishing registering and self-describing, the energy storage system waits for the distribution network automation management system to issue an operation instruction, and the method comprises the following steps: and allowing the participated power grid to apply scenes and priorities, outputting active and reactive instructions and the like. It should be noted that, when waiting for the power grid to issue an operation instruction, the energy storage system should keep sampling the main electrical quantity of the power grid, and if the power grid is abnormal or fails in operation during the period, the energy storage system may be in a standby or adaptive adjustment state according to a preset protocol.
Step two: when the power grid frequency voltage index is out of limit, the energy storage system adjusts power based on the application scene priority and the state of the energy storage system;
after a single distributed energy storage system is connected to a power grid, the power grid determines an active reactive instruction value output by the energy storage system according to a model, and sets self-adaptive adjustment of the active reactive instruction value under a power grid frequency modulation scene to be priority A and reactive compensation application scene to be priority B according to the battery type and state information of the power grid. After receiving an instruction issued by a power grid, the energy storage system starts to work, and the working modes can be a shutdown mode, a scheduling mode, an adaptive adjustment mode and an off-grid running mode, wherein the patent mainly focuses on the running mode of the energy storage system in a grid-connected state, so that the frequency and voltage ranges of the power grid corresponding to the scheduling mode and the adaptive adjustment mode are shown as formulas (1) to (2) and (3).
Wherein, U up The upper limit value of the normal operation of the voltage of the power grid; u shape down The lower limit value is the normal operation lower limit value of the power grid voltage; f up The upper limit value of the normal operation of the power grid frequency is set; f down A lower limit value for normal operation of the power grid frequency; u shape max Protecting an upper limit value for the voltage of the power grid; u shape min Protecting a lower limit value for the voltage of the power grid; f max Protecting an upper limit value for the frequency of the power grid; f min And protecting the lower limit value for the frequency of the power grid.
Shutdown mode, system not started;
when the grid frequency and voltage are within the normal range, the energy storage system is in a dispatch mode, i.e. S mode And =0. At the moment, the energy storage system outputs power according to a power instruction issued by a power grid, and an active instruction P common Reactive instruction Q common The output may be controlled using a PQ control strategy, as shown in fig. 3;
when the frequency and voltage indexes of the power grid are abnormal, the energy storage system is in self-adaptationShould adjust the mode, i.e. S mode =1 or S mode And (5) =2. At the moment, the energy storage system carries out autonomous response support according to the index deviation value, the priority and the self energy state.
In the adaptive regulation mode, the grid frequency is t 0 Down to f at time 1 And at the moment, the energy storage system starts active support power grid frequency response control. Sampling the power grid frequency at intervals delta t, and setting the sampling time of the energy storage system as t 1 、t 2 、t 3 …t i-1 、t i 、t i+1 …, the frequency obtained each time is f 1 、f 2 、f 3 …f i-1 、f i 、f i+1 …, as shown in fig. 4. The rate of change of frequency is then:
when the energy storage system samples a new grid frequency value, a new frequency change rate k is calculated according to the formula (4) by combining the previous sampling point i . According to the difference of the frequency change rate obtained by two adjacent sampling points, the transient frequency support of the energy storage system to the power grid can be divided into the following four working conditions:
1) If k is i < 0 and k i ＜k i-1 The energy storage system then obtains k according to the new i And (5) calculating the response output power value of the energy storage system to adjust. Wherein, P ref For scheduling the command power value, K is the droop coefficient of the energy storage system, t m For a set maximum fall time of the frequency, t 0 And the system actively supports the frequency response time of the power grid.
2) If k is i < 0 and k i ≥k i-1 And if the output power is not adjusted by the energy storage system, responding according to the output power value calculated by the previous frequency sampling point.
3) If k is i And if the calculated value is more than or equal to 0 and then n continuous frequency sampling values are all more than zero, the energy storage system exits from the active support grid frequency response and returns to the conventional droop control as shown in the formula (6) or returns to the initial scheduling instruction mode.
P o ＝P ref +K(f i -f i-1 ) (6)
4) If k is i < 0 and k i ≤k min (k min The set minimum reduction frequency change rate) is obtained, the energy storage system immediately outputs at the maximum power, meanwhile, the power grid frequency value is detected at all times, and when the working operation condition 3) is met, a conventional droop control mode is switched to.
In the self-adaptive power regulation of the primary frequency modulation of the power grid, the energy storage system samples the power grid frequency at the same time interval, and when the frequency deviation is in a certain degree, the energy storage system starts active support power grid frequency response control. In the process of actively supporting the frequency response of the power grid, the energy storage system is mainly divided into two processes: transient variation support and steady state deviation support. The transient state change stage of the system refers to the process that the frequency of the power grid suddenly drops or rises, the main frequency modulation unit in the system does not completely respond, and the energy storage system calculates the corresponding frequency change rate according to the two frequency values before and after the frequency is acquired in the process. And then, comparing the frequency change rate at each moment, always obtaining the adjustment power of the energy storage system by integral operation according to the frequency change rate with a larger absolute value in the process of descending or ascending of the frequency transient, and then obtaining the real-time output value of the energy storage system by combining with the scheduling reference power. When the signs of the frequency change rates at a plurality of continuous sampling moments are opposite to the transient change process, the energy storage system performs a steady-state deviation supporting stage, and the energy storage system does not calculate an output power value according to the frequency change rate any more, but converts the frequency change rate into a conventional droop control mode to perform frequency response supporting. A block diagram of the plug-and-play energy storage system actively supporting grid frequency response power control when the grid frequency decreases is shown in fig. 5.
Step three: otherwise, the energy storage system adjusts the power based on the initial power scheduling instruction issued by the power grid.
When the application scene is the priority A, active power adjustment is adopted;
and when the application scene is B priority, adopting reactive power adjustment.
After the energy storage system is connected to the power grid, the energy storage system can operate according to the issued instruction power all the time, and can also perform adaptive power adjustment according to the set application scene priority when the power grid indexes are abnormal. When a certain index of the power grid is out of limit or abnormal, the energy storage system performs self-adaptive adjustment according to the corresponding application scene priority and by combining the self state. The priority is set by the distribution network automation system under the corresponding application scene according to the current energy storage type and the available capacity of the energy storage system, so that gradient utilization of various distributed energy storage systems in the power grid can be realized, and the influence of concentrated energy output on safe and stable operation of the power grid is avoided.
And when the power grid voltage is in the out-of-limit area of the formula (2), the energy storage system is in the priority level of the B layer, so that the output state of the original operation scheduling mode is kept, after t time, the energy storage system detects the power grid voltage again, and if the power grid voltage index is still in the out-of-limit level of the formula (2), the trend of good conversion is not existed:
In the self-adaptive adjusting mode, all the energy storage systems with the priority of the layer A and the priority of the layer B are put into operation and continue for t 1 And then, the energy storage system detects the electric indexes of the power grid, if the indexes corresponding to compensation are still in a deterioration state as shown in the formula (3) and exist
Or
Then the energy storage system adjusts the output power to the maximum at this moment, and the maximum support to the power grid is realized.
And when detecting that the corresponding electrical indexes of the power grid are in the stage of returning to the normal state, the energy storage systems participating in the support orderly exit from the self-adaptive regulation mode and return to the initial regulation mode. The electric indexes can be judged according to the regression degree and the trend of the electric indexes, when the electric indexes meet the formula (8), the energy storage systems with the B-layer priority exit the self-adaptive adjustment mode firstly, and then when the electric indexes meet the formula (1), the energy storage systems with the A-layer priority exit the self-adaptive adjustment mode.
(8) In the off-grid operation mode, the energy storage system can continue to supply power to the surrounding loads by adopting V/f control.
Based on the same inventive concept, the invention also provides an energy storage system power control system, which comprises:
an acquisition module: the power grid dispatching method comprises the steps of obtaining a power grid frequency voltage index, an initial power dispatching instruction, application scenes capable of participating in dispatching and application scene priorities;
a first adjustment module: the energy storage system is used for carrying out power regulation based on the application scene priority and the state of the energy storage system when the grid frequency voltage index is out of limit;
a second adjustment module: and the power regulating module is used for regulating the power of the energy storage system based on the initial power dispatching instruction issued by the power grid.
The first adjustment module includes: the device comprises a selection unit, a judgment unit and an exit unit;
the selection unit is used for selecting and executing adaptive regulation control or initial power scheduling instructions according to the priority of the energy storage system when the frequency and voltage indexes of the power grid are out of limit;
the judging unit is used for judging whether the power grid frequency voltage index returns to normal or not, and if the power grid frequency voltage index is abnormal, the energy storage system adjusts all the energy storage systems to be at the maximum power until the power grid frequency voltage index returns to normal;
and the exit unit is used for exiting the adaptive regulation and control according to the priority order and executing the initial power scheduling instruction after the index returns to normal.
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 block diagrams of methods, systems, and computer program products according to embodiments of the application. It will be understood that each flow and block of the flow diagrams and block diagrams, and combinations of flows and blocks in the flow diagrams and 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 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 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 block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (11)
1. An energy storage system power control method, the method comprising:
acquiring a power grid frequency and voltage index, an initial power scheduling instruction, application scenes capable of participating in scheduling and priorities of the application scenes;
when the power grid frequency voltage index is out of limit, the energy storage system adjusts power based on the application scene priority and the state of the energy storage system;
otherwise, the energy storage system adjusts the power based on the initial power scheduling instruction issued by the power grid;
when the grid frequency voltage index is out of limit, the energy storage system adjusts power based on the application scene priority and the state of the energy storage system, and the method comprises the following steps:
when the grid frequency voltage index is out of limit, selecting an application scene based on the current self-reported state information of the energy storage system;
selecting an adaptive regulation control or initial power scheduling instruction according to the priority corresponding to the application scene, and executing the instruction;
after the instruction is executed, judging whether the power grid frequency voltage index returns to normal, if not, adjusting all energy storage systems to be at the maximum power until the power grid frequency voltage index returns to normal;
when the index returns to normal, the adaptive regulation control is quitted according to the priority order, and an initial power scheduling instruction is executed;
the application scene priority comprises the following steps from high to low in sequence: priority a, priority B, and priority C.
2. The method for controlling power of an energy storage system according to claim 1, wherein the selecting to execute the adaptive regulation control or the initial power scheduling command according to the priority of the energy storage system comprises:
when the application scene of the energy storage system is priority A, the energy storage system immediately executes adaptive adjustment control;
when the application scene of the energy storage system is priority B, whether the frequency and voltage indexes of the power grid return to normal or not is detected again after a preset time period is delayed; if the power grid frequency voltage index returns to normal, the energy storage system keeps an initial power scheduling instruction; otherwise, the energy storage system immediately executes self-adaptive adjustment control;
when the application scene of the energy storage system is priority C, the energy storage system executes an initial power scheduling instruction;
the preset time period is the adjusting time of the energy storage system for executing the priority A.
3. The energy storage system power control method according to claim 2, wherein the energy storage system immediately performs adaptive regulation control, including:
acquiring the power grid frequency based on a preset time interval, and calculating the frequency change rate of all frequency sampling points according to time;
calculating a power adjustment amount based on a current frequency change amount when the calculated frequency change rate is less than 0 and less than a previous frequency change rate;
when the calculated frequency change rate is less than 0 and not less than the previous frequency change rate, adjusting based on the previous power adjustment amount;
when the calculated frequency change rate is not less than 0 and the frequency change rates of the continuous frequency sampling points are all greater than 0, calculating a power adjustment amount according to a droop control type or performing power adjustment based on an initial power scheduling instruction;
and when the calculated frequency change rate is not less than 0 and less than a preset frequency change rate, the energy storage system outputs and detects the power grid frequency voltage index with the maximum power until the working operation condition is met, and the droop control is carried out to calculate the power adjustment amount.
4. The energy storage system power control method of claim 3, wherein the rate of change of frequency is calculated as follows:
in the formula, k i Is the rate of change of frequency; t is t i Is the ith sampling moment; f. of i The frequency of the ith sampling moment; t is t i-1 The sampling time is the previous sampling time of the ith sampling time; f. of i-1 The frequency of the sampling instant preceding the ith sampling instant.
5. The energy storage system power control method of claim 3, wherein the calculation of the power adjustment based on the current frequency change amount is as follows:
in the formula, P o Is the amount of power adjustment; p ref Scheduling the command power value; k is the droop coefficient of the energy storage system; t is t m Maximum fall time for the set frequency; t is t 0 Actively supporting the power grid frequency response time for the system; k is a radical of i Is the rate of change of frequency.
6. The energy storage system power control method of claim 3, wherein the calculation of the power adjustment according to the droop control is as follows:
P o ＝P ref +K(f i -f i-1 )
in the formula, P ref Scheduling the command power value; k is the droop coefficient of the energy storage system; f. of i The frequency of the ith sampling moment; f. of i-1 The frequency of the sampling instant preceding the ith sampling instant.
7. The power control method of the energy storage system according to claim 2, wherein after the index returns to normal, the adaptive modulation control is exited according to the priority order, and the initial power scheduling command is executed, including:
and if the grid frequency voltage index returns to normal, preferentially quitting the priority B, then quitting the priority A, and executing an initial power scheduling instruction by the energy storage system.
8. The energy storage system power control method according to claim 1, wherein the obtaining of the grid frequency voltage index, the initial power scheduling command, the application scenarios that can participate in scheduling, and the priority of each application scenario further comprises:
establishing a communication relation between a power grid and an energy storage system based on a plug-and-play physical interface;
the energy storage system sends self state information and application scenes which can participate in scheduling to the power grid based on the communication relation;
wherein the plug-and-play physical interface comprises: the power interface and the communication interface are integrated into a whole interface.
9. The energy storage system power control method of claim 8, wherein the status information comprises:
the method comprises the following steps of accessing the energy storage system into a power grid mode, outputting voltage of the energy storage system, battery type, remaining energy of an energy storage battery pack, maximum allowable charge and discharge power and duration of the battery pack and reactive compensation capacity of the energy storage system.
10. The energy storage system power control method of claim 8, wherein the application scenarios that can participate in scheduling comprise:
peak clipping and valley filling, frequency modulation, power fluctuation stabilization, reactive compensation and harmonic wave treatment.
11. An energy storage system power control system, the system comprising:
an acquisition module: the power grid dispatching method comprises the steps of obtaining a power grid frequency voltage index, an initial power dispatching instruction, application scenes capable of participating in dispatching and application scene priorities;
a first adjustment module: the energy storage system is used for carrying out power regulation based on the application scene priority and the state of the energy storage system when the grid frequency voltage index is out of limit;
a second adjustment module: the initial power dispatching instruction is used for carrying out power regulation on the energy storage system based on the power grid;
the first adjustment module includes: the device comprises a first selection unit, a second selection unit, a judgment unit and an exit unit;
the first selection unit is used for selecting an application scene based on the current self-reported state information of the energy storage system when the frequency and voltage indexes of the power grid are out of limit;
the second selection unit is used for selecting an adaptive regulation control or initial power scheduling instruction according to the priority corresponding to the application scene and executing the instruction;
the judging unit is used for judging whether the power grid frequency voltage index returns to normal after the instruction is executed, and if not, adjusting all energy storage systems to be at the maximum power until the power grid frequency voltage index returns to normal;
the exit unit is used for exiting the adaptive regulation control according to the priority order and executing the initial power scheduling command after the index returns to normal;
the application scene priority comprises the following steps from high to low in sequence: priority a, priority B, and priority C.
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