CN117277595A - Control method and system of energy storage power station - Google Patents
Control method and system of energy storage power station Download PDFInfo
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- CN117277595A CN117277595A CN202311280899.2A CN202311280899A CN117277595A CN 117277595 A CN117277595 A CN 117277595A CN 202311280899 A CN202311280899 A CN 202311280899A CN 117277595 A CN117277595 A CN 117277595A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 132
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- 238000007599 discharging Methods 0.000 claims description 22
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- 230000001276 controlling effect Effects 0.000 description 19
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- 238000010248 power generation Methods 0.000 description 5
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- 238000004364 calculation method Methods 0.000 description 3
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a control method and a system of an energy storage power station, wherein the method comprises the following steps: the method comprises the steps of detecting whether the power of a first power supply is larger than the total power of a load in real time; if so, controlling the first power supply to charge the second power supply, and detecting whether the state of charge of the second power supply reaches a preset maximum electric quantity threshold value in real time; if yes, the first power supply is controlled to stop charging the second power supply, otherwise, the first step is continued; if the power of the first power supply is not greater than the total power of the load, controlling the first power supply and the second power supply to supply power to the load, and detecting whether the charge states of the first power supply and the second power supply reach a preset low-power threshold in real time; and if the charge states of the first power supply and the second power supply reach the preset low-power threshold, controlling the first power supply and the second power supply to stop supplying power to the load, otherwise, continuing to perform the first step. The safety and the reliability of the system are improved.
Description
Technical Field
The invention relates to the technical field of battery energy storage, in particular to a control method and a control system of an energy storage power station.
Background
In the existing EMS (Energy Management System, chinese name is energy management module) control system, first, the distributed power required by each PCS (Power Conversion System, chinese name is energy storage converter, also called bidirectional energy storage inverter) is calculated according to the total load power of the load side of the ac power network and the power class of each PCS. And then according to the battery SOC (State of Charge) value uploaded to the EMS by each battery communication, calculating the average value of the battery SOC, and ensuring more output energy corresponding to the larger battery SOC value in the current plurality of batteries, and less output energy corresponding to the smaller battery SOC value.
However, with the EMS control system, there occurs a long charge/discharge response time to the load, low control accuracy, and low safety, reliability, and economy of system operation.
There is thus a need for improvements and improvements in the art.
Disclosure of Invention
The invention mainly aims to provide a control method and a control system of an energy storage power station, and aims to solve the problems that an EMS control system has long charge/discharge response time to a load, low control precision and low safety, reliability and economy of system operation in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a control method of an energy storage power station, the control method of the energy storage power station comprising:
detecting whether the power of the first power supply is larger than the total power of the load in real time;
if the power of the first power supply is larger than the total power of the load, controlling the first power supply to charge the second power supply, and detecting whether the state of charge of the second power supply reaches a preset maximum electric quantity threshold value or not in real time;
if the state of charge of the second power supply reaches the preset maximum electric quantity threshold, controlling the first power supply to stop charging the second power supply, otherwise, continuously detecting whether the power of the first power supply is larger than the total power of the load;
if the power of the first power supply is not greater than the total power of the load, controlling the first power supply and the second power supply to supply power to the load, and detecting whether the charge states of the first power supply and the second power supply reach a preset low-power threshold in real time;
and if the charge states of the first power supply and the second power supply reach the preset low-power threshold, controlling the first power supply and the second power supply to stop supplying power to the load, otherwise, continuously detecting whether the power of the first power supply is larger than the total power of the load.
In the control method of the energy storage power station, the control method of the energy storage power station further comprises the following steps:
charging the second power supply when the state of charge of the second power supply is smaller than the preset low-power threshold value in a preset charging time period, and stopping charging the second power supply when the state of charge of the second power supply reaches the preset maximum-power threshold value;
and discharging the second power supply when the state of charge of the second power supply is not smaller than the preset low-power threshold value in a preset discharging time period, and stopping discharging the second power supply when the state of charge of the second power supply reaches the preset low-power threshold value.
In the control method of the energy storage power station, the control method of the energy storage power station further comprises the following steps:
and when the charge state of the first power supply is smaller than the preset low power threshold value and the charge state of the second power supply is smaller than the preset low power threshold value, controlling a third power supply to supply power to the load.
In the control method of the energy storage power station, the control method of the energy storage power station further comprises the following steps:
when the second power supply supplies power to the load, detecting the current direction of the low voltage side on the transformer connected with the third power supply in real time;
And if the current is detected to flow to the third power supply according to the current direction, controlling the second power supply to reduce the power supply output power.
In the control method of the energy storage power station, if the power of the first power supply is greater than the total power of the load, the first power supply is controlled to charge the second power supply, and whether the state of charge of the second power supply reaches a preset maximum electric quantity threshold value is detected in real time, including:
if the power of the first power supply is detected to be larger than the total power of the load, charging the second power supply by the first power supply;
detecting whether the state of charge of the second power supply reaches a preset high electric quantity threshold in real time, and reducing the power supply of the first power supply to the second power supply when the state of charge of the second power supply reaches the preset high electric quantity threshold;
and detecting whether the state of charge of the second power supply reaches the preset maximum electric quantity threshold in real time.
In the control method of the energy storage power station, the first power supply includes: a photovoltaic power source; the second power supply includes: an energy storage power supply; the energy storage power supply includes: a battery cluster; the third power supply includes: and (3) a power grid.
A control system for an energy storage power station, the control system comprising: a battery management module and an energy storage converter; the battery management module is connected with the energy storage converter;
the battery management module is used for detecting whether the power of the first power supply is larger than the total power of the load in real time;
the energy storage converter is used for controlling the first power supply to charge the second power supply when the power of the first power supply is larger than the total power of the load;
the battery management module is further configured to detect in real time whether a state of charge of the second power supply reaches a preset maximum power threshold;
the energy storage converter is further configured to control the first power supply to stop charging the second power supply when the state of charge of the second power supply reaches the preset maximum electric quantity threshold;
the battery management module is further configured to continuously detect whether the power of the first power supply is greater than the total power of the load when the state of charge of the second power supply does not reach the preset maximum power threshold;
the energy storage converter is further used for controlling the first power supply and the second power supply to supply power to the load when the power of the first power supply is not greater than the total power of the load;
The battery management module is further configured to detect in real time whether the states of charge of the first power supply and the second power supply both reach a preset low-power threshold;
the energy storage converter is further configured to control the first power supply and the second power supply to stop supplying power to the load when the states of charge of the first power supply and the second power supply reach the preset low-power threshold;
and the battery management module is further configured to continuously detect whether the power of the first power supply is greater than the total power of the load when the state of charge of the first power supply or the second power supply does not reach the preset low-power threshold.
In the control system of the energy storage power station, the control system of the energy storage power station further comprises: a battery module and an energy management module;
the battery module is respectively connected with the battery management module and the energy storage converter; the energy management module is respectively connected with the battery management module and the energy storage converter;
the battery module is used for supplying power to the load;
the energy management module is used for controlling the energy storage converter to charge the second power supply when the charge state of the second power supply is smaller than a preset low electric quantity threshold value in a preset charge time period, and controlling the energy storage converter to stop charging the second power supply when the charge state of the second power supply reaches a preset maximum electric quantity threshold value;
The energy management module is further configured to control the energy storage converter to discharge the second power supply when the state of charge of the second power supply is not less than a preset low power threshold in a preset discharge time period, and control the energy storage converter to stop discharging the second power supply when the state of charge of the second power supply reaches the preset low power threshold.
In the control system of the energy storage power station, the battery module includes: a first power supply, a second power supply, and a third power supply; the battery management module includes: a battery management unit and a power battery control unit;
the first power supply includes: a photovoltaic power source; the second power supply includes: an energy storage power supply; the energy storage power supply includes: a battery cluster; the third power supply includes: and (3) a power grid.
In the control system of the energy storage power station, the energy management module is communicated with the battery management module through a CAN bus to acquire data of the battery management module, the battery module and the battery management unit.
Compared with the prior art, the control method and the system for the energy storage power station provided by the invention comprise the following steps: detecting whether the power of the first power supply is larger than the total power of the load in real time; if the power of the first power supply is larger than the total power of the load, the first power supply is controlled to charge the second power supply, and whether the state of charge of the second power supply reaches a preset maximum electric quantity threshold value is detected in real time; if the state of charge of the second power supply reaches a preset maximum electric quantity threshold value, the first power supply is controlled to stop charging the second power supply, otherwise, whether the power of the first power supply is larger than the total power of the load is continuously detected; if the power of the first power supply is not greater than the total power of the load, controlling the first power supply and the second power supply to supply power to the load, and detecting whether the charge states of the first power supply and the second power supply reach a preset low-power threshold in real time; and if the charge states of the first power supply and the second power supply reach the preset low-power threshold, controlling the first power supply and the second power supply to stop supplying power to the load, otherwise, continuously detecting whether the power of the first power supply is larger than the total power of the load. The control precision of the charge/discharge of the EMS control system to the load is improved, so that the response time is reduced, and the safety, reliability and economy of the system operation are improved.
Drawings
FIG. 1 is a flowchart of a first embodiment of a control method of an energy storage power station according to the present invention;
FIG. 2 is a schematic functional effect diagram of an energy management system in a first embodiment of a control method of an energy storage power station according to the present invention;
FIG. 3 is a diagram of an EMS system architecture in a first embodiment of a control method for an energy storage power station according to the present invention;
FIG. 4 is a flowchart illustrating a first embodiment of a control method of an energy storage power station according to the present invention;
FIG. 5 is a flowchart of step S200 in a first embodiment of a control method of an energy storage power station according to the present invention;
FIG. 6 is a flowchart of a second embodiment of a control method of an energy storage power station according to the present invention;
FIG. 7 is a flowchart of a third embodiment of a control method of an energy storage power station according to the present invention;
fig. 8 is a hardware architecture diagram of a control system of an energy storage power station according to the present invention.
Reference numerals: 10: a pool management module; 20: an energy storage converter; 30: a battery module; 40: an energy management module; 50: a first power supply; 60: a second power supply; 70: a third power supply; 80: a battery management unit; 90: and a power battery control unit.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and more specific, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The invention provides a control method and a control system of an energy storage power station. In the invention, the power of the first power supply is compared with the total power of the load, and different charging strategies are used for the second power supply (stored energy) or the load according to different comparison results: when the power of the first power supply (photovoltaic energy source) is larger than the total power of the load, the first power supply charges the second power supply until the charge state of the second power supply reaches a preset maximum electric quantity threshold value, and the charging is stopped; and if the power of the first power supply is not greater than the total power of the load, the first power supply and the second power supply power to the load until the charge states of the first power supply and the second power supply reach the preset low-power threshold value, and discharging is stopped. Thereby effectively improving the control precision of the charge/discharge of the EMS control system to the load, reducing the response time, and improving the safety, reliability and economy of the system operation.
The following describes a design scheme of a control method of an energy storage power station through specific exemplary embodiments, and it should be noted that the following embodiments are only used for explaining the technical scheme of the invention, and are not limited in particular:
Referring to fig. 1, the present invention provides a control method of an energy storage power station in a first embodiment, including:
s100, detecting whether the power of the first power supply 50 is larger than the total power of the load in real time. Wherein the first power supply 50 includes: a photovoltaic power source.
Specifically, the control method of the energy storage power station is applied to an industrial park energy management system (namely an energy management module 40 in the application) and an energy storage system, and can achieve peak clipping and valley filling as well as optimal economic operation management.
Moreover, the control method of the energy storage power station is specially used for a BMS and EMS control system scheme of a large-scale underground energy storage power station, and has the following core functions: planning tracking, peak clipping and valley filling, stabilizing fluctuation, PID regulation, auxiliary new energy power generation, primary frequency modulation and the like.
Wherein, the energy management system can realize the optimal scheduling including: the main station basic software function, the main station expanding software function and the data of energy storage and electricity consumption are collected, so that unified data monitoring is realized; the master station basic software functions include: grid information, operational constraints and operational monitoring; the master station expansion software function comprises: electric quantity calculation, power generation analysis and power consumption analysis. The energy management system can comprehensively monitor, compare and analyze the information such as system operation information, fault information, power generation information, power utilization information and the like; and the load prediction curve and the energy storage charge-discharge guidance plan curve can be given by combining load prediction based on historical data, peak-valley electricity price difference and the like, and global coordination optimization scheduling is carried out on an industrial park, energy storage and load, such as battery information, PSC information and charge-discharge plan of the energy storage and load information of the load, so that the overall operation efficiency and the availability of the system are improved, the efficient utilization of energy is realized, and the cost, the energy conservation, the emission reduction and the environmental protection are reduced. The functional effect of the energy management system is schematically shown in fig. 2.
The energy management system has the characteristics of safety, reliability, friendly power grid, intelligence, high efficiency and the like. In addition, high-precision online calculation is carried out on the state data of the battery cells, and early warning feedback is directly carried out on abnormal results. And can realize the following functions:
1. cell health on-line monitoring: and performing real-time monitoring calculation based on the battery state data.
2. And (3) evaluating the health state of the battery cell in real time: and carrying out accurate real-time evaluation on the health state of the battery cell through lithium analysis state evaluation and internal resistance discrete analysis.
3. Early warning of a sick cell: the lithium separation degree in a pathological state, the deterioration of internal short circuit, the abnormal internal resistance early warning and the like.
The EMS control scheme provided in the application mainly comprises the following steps:
the method comprises the steps of a first electric energy input control scheme of an underground energy storage power station;
a second, internal energy control scheme of the underground energy storage power station;
and thirdly, outputting an electric energy control scheme by the underground energy storage power station.
In implementation, a specific EMS system architecture is shown in fig. 3, where an energy storage power station needs to be equipped with one set of on-site monitoring equipment (corresponding to the EMS server in fig. 3 remotely), and meanwhile, another set of on-site monitoring equipment is equipped on the load side (corresponding to the EMS server in fig. 3 locally), and both sets of on-site monitoring equipment perform parallel operation modes, so that control instructions can be issued for the operation of the energy management system.
All monitoring data acquired through the on-site monitoring equipment can be transmitted to the background server through the Internet, the informationized platform can read the data through the EMS background server and transmit the data to the background server, and the running condition of the power station can be checked in real time through account login.
The first power station and underground power station electric energy input control scheme comprises an input photovoltaic electric energy input control scheme and a wind energy input control scheme. Referring to fig. 4, in fig. 4, the energy storage Power source is used as the judging body, and the Power Grid is the Power of the total access point of the Power Grid; power Pcs is PCS Power and can be read; power PV is photovoltaic Power; power Load is the real Load Power.
First, it is detected in real time whether the power of the first power supply 50 is greater than the total power of the load, i.e. whether the current remaining power of the photovoltaic power supply is greater than the nominal power of the load, so as to supply power to the load by different power supplies according to the comparison result.
And S200, if the power of the first power supply 50 is greater than the total power of the load, controlling the first power supply 50 to charge the second power supply 60, and detecting whether the state of charge of the second power supply 60 reaches a preset maximum electric quantity threshold in real time. Wherein the second power supply 60 includes: an energy storage power supply.
Specifically, it is compared whether the power of the first power supply 50 is greater than the total power of the load:
if the power of the first power supply 50 is greater than the total power of the load, the first power supply 50 is controlled to charge the second power supply 60. Meanwhile, whether the state of charge (SOC) of the second power supply 60 reaches the preset maximum power threshold is detected in real time, which is generally 100%, so as to determine whether the photovoltaic energy source stops working according to the detection result, so as to prevent overcharging the second power supply 60.
Still further, referring to fig. 5, step S200: if the power of the first power supply 50 is greater than the total power of the load, controlling the first power supply 50 to charge the second power supply 60, and detecting whether the state of charge of the second power supply 60 reaches a preset maximum power threshold in real time includes:
s210, if it is detected that the power of the first power supply 50 is greater than the total power of the load, charging the second power supply 60 by the first power supply 50;
s220, detecting whether the state of charge of the second power supply 60 reaches a preset high power threshold in real time, and reducing the power supply of the first power supply 50 to the second power supply 60 when the state of charge of the second power supply 60 reaches the preset high power threshold;
S230, detecting whether the state of charge of the second power supply 60 reaches the preset maximum power threshold in real time.
Specifically, it is compared whether the power of the first power supply 50 is greater than the total power of the load:
if the power of the first power supply 50 is greater than the total power of the load, that is, the current remaining power of the photovoltaic power supply is greater than the nominal power of the load, at this time, the first power supply 50 charges the second power supply 60, that is, the photovoltaic power supply charges the energy storage power supply, corresponding to the energy storage charging power in fig. 4, at this time, the value of the reverse power is: set Charge P ower = Power Grid (Power of Grid total access point) +power Pcs (Pcs Power).
Meanwhile, whether the state of charge of the second power supply 60 reaches a preset high power threshold, for example, 80%, is detected in real time, and when the state of charge of the second power supply 60 reaches the preset high power threshold, the power supply of the first power supply 50 to the second power supply 60 is reduced, that is, the charging of the energy storage energy by the photovoltaic energy source is limited, the power output of the photovoltaic energy source is reduced until the energy storage energy source is full, so that the energy storage energy source can be charged and protected, and the service life of the energy storage energy source is prevented from being damaged due to too fast charging.
Then, it is further detected in real time whether the state of charge (SOC) of the second power supply 60 reaches the preset maximum power threshold, typically 100%.
With continued reference to fig. 1, S300, if the state of charge of the second power supply 60 reaches the preset maximum power threshold, the first power supply 50 is controlled to stop charging the second power supply 60, otherwise, whether the power of the first power supply 50 is greater than the total power of the load is continuously detected.
Specifically, it is detected in real time whether the state of charge of the second power supply 60 reaches a preset maximum power threshold:
if the state of charge of the second power supply 60 reaches the preset maximum power threshold, that is, the energy storage power supply is fully charged, the first power supply 50 is controlled to stop charging the second power supply 60; if the state of charge of the second power supply 60 does not reach the preset maximum power threshold, the power of the first power supply 50 is continuously detected to determine whether the power is greater than the total power of the load, so as to charge the second power supply 60, and the second power supply 60 is disconnected in time when full, so that overcharging of the second power supply 60 is effectively prevented.
And S400, if the power of the first power supply 50 is not greater than the total power of the load, controlling the first power supply 50 and the second power supply 60 to supply power to the load, and detecting whether the states of charge of the first power supply 50 and the second power supply 60 reach preset low-power thresholds in real time.
Specifically, it is compared whether the power of the first power supply 50 is greater than the total power of the load:
if the power of the first power supply 50 is not greater than the total power of the load, at this time, the first power supply 50 and the second power supply 60 are controlled to supply power to the load, that is, when the current remaining power of the photovoltaic power supply is less than the nominal power of the load, the photovoltaic power supply and the energy storage power supply are controlled to supply power to the load together, which corresponds to the energy storage discharge power in fig. 4, and at this time, the grid power is: set Charge P ower = Power Grid (Power of Grid total access point) -Power Pcs (Pcs Power).
Then, it is detected in real time whether the states of charge of the first power supply 50 and the second power supply 60 reach a preset low power threshold, for example, 20%, so as to determine whether to disconnect the first power supply 50 and the second power supply 60 according to the detection result.
And S500, if the charge states of the first power supply 50 and the second power supply 60 reach the preset low-power threshold, controlling the first power supply 50 and the second power supply 60 to stop supplying power to the load, otherwise, continuously detecting whether the power of the first power supply 50 is larger than the total power of the load.
Specifically, it is detected in real time whether the states of charge of the first power supply 50 and the second power supply 60 reach a preset low-power threshold:
if the states of charge of the first power supply 50 and the second power supply 60 reach the preset low-power threshold, for example, reach 20%, the first power supply 50 and the second power supply 60 are controlled to stop supplying power to the load so as to prevent the first power supply 50 and the second power supply 60 from overdischarging and unsafe power consumption; if the state of charge of the first power supply 50 or the second power supply 60 does not reach the preset low power threshold, the load is normally charged, and whether the power of the first power supply 50 is greater than the total power of the load is continuously detected.
However, if the first power supply 50 has reached the preset low power threshold, the second power supply 60 is only used to supply power to the load, and at this time, it is only necessary to determine whether the state of charge of the second power supply 60 reaches the preset low power threshold, and when the state of charge of the second power supply 60 reaches the preset low power threshold, the second power supply 60 is controlled to stop supplying power to the load, otherwise, it is continuously detected whether the power of the second power supply 60 is greater than the total power of the load.
Still further, referring to fig. 6, the control method of the energy storage power station according to the second embodiment of the present invention further includes:
a100, charging the second power supply 60 when the state of charge of the second power supply 60 is smaller than the preset low-power threshold value in a preset charging time period, and stopping charging the second power supply 60 when the state of charge of the second power supply 60 reaches the preset maximum-power threshold value;
and A200, discharging the second power supply 60 when the state of charge of the second power supply 60 is not less than the preset low power threshold in a preset discharging time period, and stopping discharging the second power supply 60 when the state of charge of the second power supply 60 reaches the preset low power threshold. Wherein the stored energy source comprises: a battery cluster.
Wherein, the internal energy control scheme of the second, underground energy storage power station includes: the energy management system communicates with the BMS to acquire BMS, battery clusters and BMU data (Battery management Unit, chinese name is battery management unit) and is responsible for evaluating the data transmitted by the CMU, if the data is abnormal, the battery is protected, the current reduction requirement is sent out, or a charging and discharging path is cut off so as to avoid the battery exceeding the allowable use condition, and meanwhile, the electric quantity and the temperature of the battery are managed), and the data of the BMS such as the temperature, the voltage and the current are obtained through CAN bus communication.
The energy storage data is acquired by adopting a three-layer architecture: BMS, battery clusters, and BMU.
Wherein, the data in BMU includes: the voltage, temperature, SOC and SOH (SOH refers to the capacity, health and performance state of a storage battery, and is simply the ratio of the performance parameter to the nominal parameter after the battery is used for a period of time) of each single battery core; total voltage, total current, average voltage, differential voltage, ampere hour, safety information (i.e., alarm information such as high temperature alarm, overcurrent alarm, etc.); the method can set the equalization command on a single cell in the BMU to acquire the equalized current information. The battery cluster data includes voltage, current, power, SOC, SOH, ampere-hour meter status (ampere-hour meter, a meter that measures electric power using the principle of current versus time integration), ampere-hour meter status for predicting total mileage (or electric power) that can be travelled, whether status is normal, maximum minimum voltage BMU information, and maximum minimum temperature BMU information.
The data in the BMS include: output power, total voltage, current, operating state, etc.
The battery management system (BMS, i.e. the battery management module in the present application) sends information (uploading battery information to the host computer for monitoring, and real-time reading the battery status through CAN communication) includes, but is not limited to:
1. Switching value information: positive contactor position, negative contactor position, pre-charge contactor position, maintenance switch position, fuse state, etc.;
2. analog quantity information: the battery pack voltage, the battery pack current, the battery pack power, the battery pack SOC, the battery pack SOH, the number of cycles, the positive bus insulation resistance, the negative bus insulation resistance, the battery rated capacity, the battery rated energy, the highest module voltage, the lowest module voltage, the module voltage average, the module voltage range, the module highest voltage number, the module lowest voltage number, the highest module temperature, the lowest module temperature, the module temperature average, the module temperature range, the module highest temperature number, the module lowest temperature number, the highest cell voltage, the lowest cell voltage, the cell voltage average, the cell voltage range, the cell highest voltage cell number, the cell lowest voltage cell number, the highest cell temperature, the cell highest temperature cell number, the cell lowest temperature cell number, all cell voltages and numbers, all cell temperatures and numbers.
Also, in a preset charging period, there may be one or more charging periods, and when the state of charge of the second power source 60 (for example, the battery cluster) is less than the preset low power threshold (20%), the second power source 60 is charged, and when the state of charge of the second power source 60 reaches the preset maximum power threshold (100%), the charging of the second power source 60 is stopped. And, in the preset discharging period, one or more discharging periods may be used, and when the state of charge of the second power supply 60 is not less than the preset low power threshold, the second power supply 60 is discharged, and when the state of charge of the second power supply 60 reaches the preset low power threshold, the second power supply 60 is stopped from being discharged, so as to prevent the second power supply 60 from overdischarging.
The Energy Management System (EMS) can automatically start up to charge the battery system (namely the battery module) according to the set charging time node until the battery system is full or a preset charging time period is ended, and when the set discharging time node is reached, the energy management system judges the SOC of the battery system and accords with the discharging condition (for example, after the preset discharging time is reached or the SOC is larger than a preset low-power threshold, the energy management system discharges the battery system through adjusting a strategy, and after the discharging is completed or the preset charging time period is ended, the energy management system stops to enter a sleep standby mode.
Still further, referring to fig. 7, the control method of the energy storage power station according to the third embodiment of the present invention further includes:
b100, when the second power supply 60 supplies power to the load, detecting the current direction of the low voltage side on the transformer connected to the third power supply 70 in real time;
b200, if it is detected that current flows to the third power supply 70 according to the current direction, controlling the second power supply 60 to reduce the power supply output power. Wherein the third power supply 70 includes: and (3) a power grid.
Specifically, the third and underground energy storage power station output electric energy control scheme comprises the following steps: the converted voltage is output to the national grid or to the control of the power supply equipment. In the output energy management system, since the load is constantly changing, the difference in load electricity consumption is large in the heavy load and light load periods.
Thus, to ensure that the power generated by the energy storage system is provided directly to the local load and not fed to the grid (third power supply 70), the energy storage system needs to be configured with an anti-reflux control strategy: detecting the current direction of the low voltage side of the transformer connected to the third power supply 70 in real time while the second power supply 60 supplies power to the load; and if it is detected that current flows to the third power supply 70 according to the current direction, the second power supply 60 is controlled to reduce the power supply output power, that is, the power generation power of the system is regulated by monitoring the power signal of the low-voltage side of the power grid transformer in real time, and once the inverter is found to input energy to the power grid, the inverter is controlled to reduce the output power through CAN bus communication immediately, so that the power generation power of the energy storage system is reduced, and the electric energy is saved.
Still further, the control method of the energy storage power station further comprises:
when the state of charge of the first power supply 50 is less than the preset low power threshold and the state of charge of the second power supply 60 is less than the preset low power threshold, the third power supply 70 is controlled to supply power to the load.
Specifically, when the SOC of the first power supply 50 and the SOC of the second power supply 60 are both smaller than the preset low-power threshold value by 20%, the third power supply 70 supplies power to the load, that is, when the first power supply 50 and the second power supply 60 are both low-power, the power supply to the load by the power grid is directly controlled, so that the normal power supply of the load is ensured.
Referring to fig. 8, the control system of an energy storage power station provided by the present invention includes: a battery management module 10 and an energy storage converter 20; the battery management module 10 is connected with the energy storage converter 20;
the battery management module 10 is configured to detect in real time whether the power of the first power source 50 is greater than the total power of the load;
the energy storage converter 20 is configured to control the first power source 50 to charge the second power source 60 when the power of the first power source 50 is greater than the total power of the load;
the battery management module 10 is further configured to detect in real time whether the state of charge of the second power supply 60 reaches a preset maximum power threshold;
the energy storage converter 20 is further configured to control the first power supply 50 to stop charging the second power supply 60 when the state of charge of the second power supply 60 reaches the preset maximum power threshold;
the battery management module 10 is further configured to continuously detect whether the power of the first power supply 50 is greater than the total power of the load when the state of charge of the second power supply 60 does not reach the preset maximum power threshold;
the energy storage converter 20 is further configured to control the first power source 50 and the second power source 60 to supply power to the load when the power of the first power source 50 is not greater than the total power of the load;
The battery management module 10 is further configured to detect in real time whether the states of charge of the first power supply 50 and the second power supply 60 reach a preset low-power threshold;
the energy storage converter 20 is further configured to control the first power supply 50 and the second power supply 60 to stop supplying power to the load when the states of charge of the first power supply 50 and the second power supply 60 reach the preset low-power threshold;
the battery management module 10 is further configured to continuously detect whether the power of the first power supply 50 is greater than the total power of the load when the state of charge of the first power supply 50 or the second power supply 60 does not reach the preset low battery threshold.
Specifically, the control method of the energy storage power station is applied to a control system of the energy storage power station, and then the control method of the energy storage power station is realized as follows:
first, it is detected in real time whether the power of the first power supply 50 is greater than the total power of the load, i.e. whether the current remaining power of the photovoltaic power supply is greater than the nominal power of the load:
if the power of the first power supply 50 is greater than the total power of the load, the second power supply 60 (energy storage power supply) is charged by the first power supply 50. Meanwhile, whether the state of charge (SOC, SOC refers to the state of charge, also called the remaining capacity, and represents the ratio of the remaining capacity after the battery is used for a period of time or is left unused for a long period of time to the capacity of the full charge state) of the second power supply 60 reaches the preset maximum power threshold value is generally 100%.
Next, if the state of charge of the second power supply 60 reaches the preset maximum power threshold, that is, the energy storage power supply is fully charged, the first power supply 50 is controlled to stop charging the second power supply 60; if the state of charge of the second power supply 60 does not reach the preset maximum power threshold, it is continuously detected whether the power of the first power supply 50 is greater than the total power of the load.
If the power of the first power supply 50 is not greater than the total power of the load, the first power supply 50 and the second power supply 60 are controlled to supply power to the load, that is, when the current residual power of the photovoltaic power supply is less than the nominal power of the load, the photovoltaic power supply and the energy storage power supply are controlled to supply power to the load together; then, it is detected in real time whether the states of charge of the first power source 50 and the second power source 60 reach a preset low power threshold, for example, 20%.
Finally, if the states of charge of the first power supply 50 and the second power supply 60 reach the preset low-power threshold, for example, 20%, the first power supply 50 and the second power supply 60 are controlled to stop supplying power to the load so as to prevent the first power supply 50 and the second power supply 60 from overdischarging and unsafe power consumption; if the state of charge of the first power supply 50 or the second power supply 60 does not reach the preset low power threshold, the load is normally charged, and whether the power of the first power supply 50 is greater than the total power of the load is continuously detected.
The following technical effects exist in the application:
the EMS energy storage monitoring system is utilized to communicate with the battery (cluster), the converter and other auxiliary equipment (such as a small weather station, an ammeter, fire protection, monitoring and the like) and the like, so that the running state and the working parameters of the related equipment are collected in real time, and the power distribution is carried out by combining the upper-level dispatching instruction and the battery running state, so that the energy storage system can be optimally operated.
And the EMS energy storage monitoring system rapidly completes the construction of the whole monitoring system according to the monitored object and the system requirement, such as data configuration, graphic configuration, distributed control configuration, communication configuration, report configuration and the like, so as to monitor and control on the running equipment on site, thereby realizing various functions of data acquisition, display, alarm, equipment control, parameter adjustment and the like.
Then, the EMS energy storage monitoring system is used for monitoring each device in real time, and an abnormal event (such as overcurrent, overvoltage, temperature super-high and the like) is warned according to a preset warning condition (such as setting a set value and triggering a warning when the set value is exceeded). The alarm types mainly comprise out-of-limit alarm, communication fault alarm, deflection alarm and other user-defined alarms. The alarm event reminds the user in the modes of sound, popup window, short message and mail. The system automatically records all alarm information, the alarm information is classified, archived and stored in a database, and a user can search according to time, alarm type, alarm level and other conditions. The alarm supports layering, grading and classifying alarm.
Furthermore, the EMS energy storage monitoring system can increase, decrease and define users according to the needs, the roles of the users comprise a system administrator, operation and maintenance personnel, common users and the like, and the users need to log in the system by using passwords. And users of different levels have different operation rights, and all operations of the users are automatically recorded in the work log database.
Finally, different control strategies are adopted for different states, automatic local energy balance control is achieved, remote energy scheduling management is supported, battery charge and discharge management, peak clipping and valley filling electricity utilization management, mains supply power limit management, backflow prevention control, electric automobile rapid charging management and the like are achieved.
Still further, the control system of the energy storage power station further comprises: a battery module 30 (i.e., a battery system) and an energy management module 40 (i.e., an energy management system);
the battery module 30 is connected with the battery management module 10 and the energy storage converter 20 respectively; the energy management module 40 is connected with the battery management module 10 and the energy storage converter 20 respectively;
the battery module 30 is used for supplying power to the load;
the energy management module 40 is configured to control the energy storage converter 20 to charge the second power supply 60 when the state of charge of the second power supply 60 is less than a preset low power threshold in a preset charging period, and control the energy storage converter 20 to stop charging the second power supply 60 when the state of charge of the second power supply 60 reaches a preset maximum power threshold;
The energy management module 40 is further configured to control the energy storage converter 20 to discharge the second power supply 60 when the state of charge of the second power supply 60 is not less than a preset low power threshold in a preset discharge time period, and control the energy storage converter 20 to stop discharging the second power supply 60 when the state of charge of the second power supply 60 reaches the preset low power threshold.
Wherein the battery module 30 includes: a first power supply 50, a second power supply 60, and a third power supply 70; the battery management module 10 includes: a battery management unit 80 and a power battery control unit 90; the first power supply 50 includes: a photovoltaic power source; the second power supply 60 includes: an energy storage power supply; the energy storage power supply includes: a battery cluster; the third power supply 70 includes: and (3) a power grid.
Specifically, in the preset charging period, one or more charging periods may be used, and when the state of charge of the second power supply 60 (battery system) is less than the preset low power threshold (20%), the second power supply 60 is charged, and when the state of charge of the second power supply 60 reaches the preset maximum power threshold (100%), the charging of the second power supply 60 is stopped. And, in the preset discharging period, one or more discharging periods may be used, and when the state of charge of the second power supply 60 is not less than the preset low power threshold, the second power supply 60 is discharged, and when the state of charge of the second power supply 60 reaches the preset low power threshold, the second power supply 60 is stopped from being discharged, so as to prevent the second power supply 60 from overdischarging.
Still further, the energy management module 40 communicates with the battery management module 10 through a CAN bus to acquire data of the battery management module 10, the battery module 30 and the battery management unit 80.
Specifically, the energy management system communicates with the BMS, acquires BMS, battery cluster and BMU data, etc., and acquires BMS data, such as temperature, voltage and current, etc., through CAN bus communication.
Wherein, the data in the BMU (battery management unit 80) includes: voltage, temperature, SOC, SOH of each single cell; total voltage, total current, average voltage, differential pressure, ampere hour number, insurance information; the method can set the equalization command on a single cell in the BMU to acquire the equalized current information. The battery cluster data includes voltage, current, power, SOC, SOH, ampere-hour status, maximum minimum voltage BMU information, and maximum minimum temperature BMU information.
The data in the BMS include: output power, total voltage, current, operating state, etc.
In summary, the method and system for controlling an energy storage power station provided by the invention comprise the following steps: detecting in real time whether the power of the first power supply 50 is greater than the total power of the load; if the power of the first power supply 50 is greater than the total power of the load, the first power supply 50 is controlled to charge the second power supply, and whether the state of charge of the second power supply reaches a preset maximum electric quantity threshold value is detected in real time; if the state of charge of the second power supply reaches the preset maximum electric quantity threshold, the first power supply 50 is controlled to stop charging the second power supply, otherwise, whether the power of the first power supply 50 is larger than the total power of the load is continuously detected; if the power of the first power supply 50 is not greater than the total power of the load, controlling the first power supply 50 and the second power supply to supply power to the load, and detecting whether the charge states of the first power supply 50 and the second power supply reach the preset low-power threshold in real time; if the states of charge of the first power supply 50 and the second power supply reach the preset low-power threshold, the first power supply 50 and the second power supply are controlled to stop supplying power to the load, otherwise, whether the power of the first power supply 50 is larger than the total power of the load is continuously detected. The control precision of the charge/discharge of the EMS control system to the load is improved, so that the response time is reduced, and the safety, reliability and economy of the system operation are improved.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (10)
1. The control method of the energy storage power station is characterized by comprising the following steps of:
detecting whether the power of the first power supply is larger than the total power of the load in real time;
if the power of the first power supply is larger than the total power of the load, controlling the first power supply to charge the second power supply, and detecting whether the state of charge of the second power supply reaches a preset maximum electric quantity threshold value or not in real time;
if the state of charge of the second power supply reaches the preset maximum electric quantity threshold, controlling the first power supply to stop charging the second power supply, otherwise, continuously detecting whether the power of the first power supply is larger than the total power of the load;
if the power of the first power supply is not greater than the total power of the load, controlling the first power supply and the second power supply to supply power to the load, and detecting whether the charge states of the first power supply and the second power supply reach a preset low-power threshold in real time;
And if the charge states of the first power supply and the second power supply reach the preset low-power threshold, controlling the first power supply and the second power supply to stop supplying power to the load, otherwise, continuously detecting whether the power of the first power supply is larger than the total power of the load.
2. The method of claim 1, further comprising:
charging the second power supply when the state of charge of the second power supply is smaller than the preset low-power threshold value in a preset charging time period, and stopping charging the second power supply when the state of charge of the second power supply reaches the preset maximum-power threshold value;
and discharging the second power supply when the state of charge of the second power supply is not smaller than the preset low-power threshold value in a preset discharging time period, and stopping discharging the second power supply when the state of charge of the second power supply reaches the preset low-power threshold value.
3. The method of claim 2, further comprising:
And when the charge state of the first power supply is smaller than the preset low power threshold value and the charge state of the second power supply is smaller than the preset low power threshold value, controlling a third power supply to supply power to the load.
4. The method of claim 3, further comprising:
when the second power supply supplies power to the load, detecting the current direction of the low voltage side on the transformer connected with the third power supply in real time;
and if the current is detected to flow to the third power supply according to the current direction, controlling the second power supply to reduce the power supply output power.
5. The method according to claim 2, wherein if the power of the first power source is greater than the total power of the load, controlling the first power source to charge the second power source, and detecting in real time whether the state of charge of the second power source reaches a preset maximum power threshold value, includes:
if the power of the first power supply is detected to be larger than the total power of the load, charging the second power supply by the first power supply;
Detecting whether the state of charge of the second power supply reaches a preset high electric quantity threshold in real time, and reducing the power supply of the first power supply to the second power supply when the state of charge of the second power supply reaches the preset high electric quantity threshold;
and detecting whether the state of charge of the second power supply reaches the preset maximum electric quantity threshold in real time.
6. The method of claim 3, wherein the first power source comprises: a photovoltaic power source; the second power supply includes: an energy storage power supply; the energy storage power supply includes: a battery cluster; the third power supply includes: and (3) a power grid.
7. A control system for an energy storage power station, the control system comprising: a battery management module and an energy storage converter; the battery management module is connected with the energy storage converter;
the battery management module is used for detecting whether the power of the first power supply is larger than the total power of the load in real time;
the energy storage converter is used for controlling the first power supply to charge the second power supply when the power of the first power supply is larger than the total power of the load;
the battery management module is further configured to detect in real time whether a state of charge of the second power supply reaches a preset maximum power threshold;
The energy storage converter is further configured to control the first power supply to stop charging the second power supply when the state of charge of the second power supply reaches the preset maximum electric quantity threshold;
the battery management module is further configured to continuously detect whether the power of the first power supply is greater than the total power of the load when the state of charge of the second power supply does not reach the preset maximum power threshold;
the energy storage converter is further used for controlling the first power supply and the second power supply to supply power to the load when the power of the first power supply is not greater than the total power of the load;
the battery management module is further configured to detect in real time whether the states of charge of the first power supply and the second power supply both reach a preset low-power threshold;
the energy storage converter is further configured to control the first power supply and the second power supply to stop supplying power to the load when the states of charge of the first power supply and the second power supply reach the preset low-power threshold;
the battery management module is further configured to continuously detect whether the power of the first power supply is greater than the total power of the load when the state of charge of the first power supply or the second power supply does not reach the preset low-power threshold.
8. The control system of an energy storage power plant of claim 7, further comprising: a battery module and an energy management module;
the battery module is respectively connected with the battery management module and the energy storage converter; the energy management module is respectively connected with the battery management module and the energy storage converter;
the battery module is used for supplying power to the load;
the energy management module is used for controlling the energy storage converter to charge the second power supply when the charge state of the second power supply is smaller than a preset low electric quantity threshold value in a preset charge time period, and controlling the energy storage converter to stop charging the second power supply when the charge state of the second power supply reaches a preset maximum electric quantity threshold value;
the energy management module is further configured to control the energy storage converter to discharge the second power supply when the state of charge of the second power supply is not less than a preset low power threshold in a preset discharge time period, and control the energy storage converter to stop discharging the second power supply when the state of charge of the second power supply reaches the preset low power threshold.
9. The control system of an energy storage power plant of claim 8, wherein the battery module comprises: a first power supply, a second power supply, and a third power supply; the battery management module includes: a battery management unit and a power battery control unit;
the first power supply includes: a photovoltaic power source; the second power supply includes: an energy storage power supply; the energy storage power supply includes: a battery cluster; the third power supply includes: and (3) a power grid.
10. The control system of claim 8, wherein the energy management module communicates with the battery management module via a CAN bus to obtain data for the battery management module, battery module, and battery management unit.
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