CN216312687U - Photovoltaic energy storage direct current intelligent micro-grid monitoring management system - Google Patents

Photovoltaic energy storage direct current intelligent micro-grid monitoring management system Download PDF

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CN216312687U
CN216312687U CN202122119234.6U CN202122119234U CN216312687U CN 216312687 U CN216312687 U CN 216312687U CN 202122119234 U CN202122119234 U CN 202122119234U CN 216312687 U CN216312687 U CN 216312687U
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protection
energy storage
monitoring
power
load
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陈敬欣
马明
尹丽华
苏红月
代松
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Baoding Jiasheng Photovoltaic Technology Co Ltd
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Baoding Jiasheng Photovoltaic Technology Co Ltd
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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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/14—Protecting elements, switches, relays or circuit breakers
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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Abstract

The utility model discloses a photovoltaic energy storage direct current intelligent microgrid monitoring and management system which comprises a configuration monitoring platform formed by power generation unit monitoring, energy storage unit monitoring, load unit monitoring and statistical analysis; the distributed power supply protection is formed by energy storage system protection, photovoltaic power generation system protection and low-voltage user side protection; installing a bidirectional meter at a power supply inlet wire, installing a bidirectional meter at a lithium iron phosphate battery energy storage and permanent magnet synchronous flywheel energy storage position, and installing a metering system formed by single meters between the microgrid and a terminal user; the configuration monitoring platform and the distributed power supply protection and metering system reasonably coordinate the power supply, the load and the energy storage equipment, balance of active power and reactive power is realized during off-grid operation, partial non-important loads are gradually cut off, reliable power supply to the important loads is ensured, flexibility and intelligence of the system are improved to the greatest extent, and the system is adaptive to the expansibility requirement of the system.

Description

Photovoltaic energy storage direct current intelligent micro-grid monitoring management system
Technical Field
The utility model relates to the technical field of micro-grids, in particular to a photovoltaic energy storage direct-current intelligent micro-grid monitoring and management system.
Background
The micro-grid is also translated into a micro-grid, which is a small-sized power distribution system consisting of a distributed power supply, an energy storage device, an energy conversion device, a load, a monitoring and protecting device and the like, the micro-grid is proposed to realize flexible and efficient application of the distributed power supply, solve the problem of grid connection of the distributed power supplies which are huge in quantity and various in form, develop and extend the micro-grid, can fully promote large-scale access of the distributed power supply and renewable energy, realize high-reliability supply of various energy forms of the load, and is an effective way for realizing an active power distribution network, so that the traditional power grid is transited to an intelligent power grid;
the existing microgrid system has few functions, and can not be reasonably regulated and controlled by itself when a distribution network device fails, so that outage and outage of some important devices are caused, and energy can not be utilized to the maximum extent at the same time, so that energy waste is caused.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide a photovoltaic energy storage dc intelligent microgrid monitoring and management system, which reasonably coordinates power supplies, loads and energy storage devices through a configuration monitoring platform and a distributed power protection and metering system, so as to realize the balance of active power and reactive power during off-grid operation, gradually remove some non-important loads, ensure reliable power supply for important loads, improve the flexibility and intelligence of the system to the maximum extent, and adapt to the expansibility requirement of the system.
In order to realize the purpose of the utility model, the utility model is realized by the following technical scheme: a photovoltaic energy storage direct current intelligent microgrid monitoring and management system comprises a configuration monitoring platform and a distributed power supply protection and metering system, wherein the configuration monitoring platform comprises power generation unit monitoring, energy storage unit monitoring, load unit monitoring and statistical analysis;
the distributed power supply protection comprises energy storage system protection, photovoltaic power generation system protection and low-voltage user side protection;
the metering system is characterized in that a bidirectional meter is arranged at a power inlet line to meter the electricity charge settlement between the micro-grid and the power grid, a bidirectional meter is arranged at a lithium iron phosphate electricity storage and permanent magnet synchronous flywheel energy storage to meter the charge and discharge electricity quantity, and a single meter is arranged between the micro-grid and a terminal user.
The further improvement lies in that: the microgrid monitoring and management system carries out comprehensive management and control from a microgrid centralized control layer, a distributed power supply and a load local control layer, adopts an online configuration mode, generates a network topology structure and a node connection relation according to a graph drawn by a user, and directly realizes plug and play of each configuration element by selecting a pixel association database.
The further improvement lies in that: the power generation unit monitoring is used for monitoring and displaying voltage, current and power generation power operation parameters and operation states of each power generation unit;
the energy storage unit monitoring is used for monitoring and displaying the voltage, the current, the charging power, the discharging power and the charge state operation parameters and the operation state of each energy storage unit, and issuing an energy storage controller operation instruction;
the load unit monitoring is used for monitoring and displaying the type, the name and the power of the load unit, and the running parameters and running states of the accumulated power consumption;
the statistical analysis is used for visually displaying data management and operation in various flexible and rich forms of figures, tables and characters, and processing various energy management decisions based on analysis and statistical functions.
The further improvement lies in that: the energy storage system protection comprises power grid under-overvoltage protection, power grid under-over-frequency protection, island effect protection, output short circuit protection, direct current reverse connection protection, reverse discharge protection, storage battery overcharge and over-discharge protection, hardware fault protection, transformer over-temperature protection, module over-temperature protection, contactor fault protection, three-phase imbalance protection, phase protection and overload protection.
The further improvement lies in that: the photovoltaic power generation system protection comprises polarity reverse connection protection, short circuit protection, overload protection, island effect protection, power grid over-voltage and under-voltage, power grid over-frequency and under-frequency protection, overheating protection, ground fault, load flow calculation and protection and anti-reflux protection.
The further improvement lies in that: the low-voltage user side protection is that overcurrent protection and undervoltage protection are arranged on a 0.4kV outgoing line, and overload protection and selective setting of user load capacity and leakage protection are configured.
The utility model has the beneficial effects that: the configuration monitoring platform and the distributed power supply protection and metering system reasonably coordinate the power supply, the load and the energy storage equipment, balance of active power and reactive power is realized during off-grid operation, partial non-important loads are gradually cut off, reliable power supply to the important loads is ensured, flexibility and intelligence of the system are improved to the greatest extent, and the system is adaptive to the expansibility requirement of the system.
Drawings
Fig. 1 is an architecture diagram of a microgrid monitoring and management system in embodiment 1 of the present invention.
FIG. 2 is a schematic diagram of an embodiment of the present invention in example 2.
Fig. 3 is a hardware configuration architecture diagram according to embodiment 2 of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
Example 1
According to fig. 1, the embodiment provides a photovoltaic energy storage direct current intelligent microgrid monitoring and management system, which comprises a configuration monitoring platform and a distributed power supply protection and metering system, wherein the microgrid monitoring and management system performs comprehensive management and control from a microgrid centralized control layer, a distributed power supply and a load local control layer, an online configuration mode is adopted, a network topology structure and a node connection relation are generated by the system according to a graph drawn by a user, and plug and play of each configuration element are realized directly by selecting a pixel associated database.
The configuration monitoring platform comprises power generation unit monitoring, energy storage unit monitoring, load unit monitoring and statistical analysis, wherein:
the power generation unit monitoring is used for monitoring and displaying voltage, current and power generation power operation parameters and operation states of each power generation unit;
the energy storage unit monitoring is used for monitoring and displaying the voltage, the current, the charging power, the discharging power and the charge state operation parameters and the operation state of each energy storage unit, and issuing an energy storage controller operation instruction;
the load unit monitoring is used for monitoring and displaying the type, the name and the power of the load unit, and the running parameters and running states of the accumulated power consumption;
the statistical analysis is used for visually displaying data management and operation in various flexible and rich forms of figures, tables and characters, and processing various energy management decisions based on analysis and statistical functions.
The distributed power supply protection comprises energy storage system protection, photovoltaic power generation system protection and low-voltage user side protection, wherein:
the metering system is characterized in that a bidirectional meter is arranged at a power inlet line to meter the electricity charge settlement between the micro-grid and the power grid, a bidirectional meter is arranged at a lithium iron phosphate electricity storage and permanent magnet synchronous flywheel energy storage to meter the charge and discharge electricity quantity, and a single meter is arranged between the micro-grid and a terminal user.
The energy storage system protection comprises power grid under-overvoltage protection, power grid under-over-frequency protection, island effect protection, output short circuit protection, direct current reverse connection protection, reverse discharge protection, storage battery overcharge and over-discharge protection, hardware fault protection, transformer over-temperature protection, module over-temperature protection, contactor fault protection, three-phase imbalance protection, phase protection and overload protection.
The photovoltaic power generation system protection comprises polarity reverse connection protection, short circuit protection, overload protection, island effect protection, power grid over-voltage and under-voltage, power grid over-frequency and under-frequency protection, overheating protection, ground fault, load flow calculation and protection and anti-reflux protection.
The low-voltage user side protection is that overcurrent protection and undervoltage protection are arranged on a 0.4kV outgoing line, and overload protection and selective setting of user load capacity and leakage protection are configured;
example 2
As shown in fig. 2 and 3, this embodiment provides a photovoltaic energy storage dc intelligent microgrid monitoring and management system, which includes:
a distributed power system adopts a photovoltaic power station and a diesel generating set, the photovoltaic power station is composed of two photovoltaic converters, the diesel generating set is started when a power grid is out of power and stored energy is exhausted, uninterrupted operation of load is ensured, meanwhile, the distributed photovoltaic permeability is researched to simulate the operation of a common synchronous generating set, and the two photovoltaic converters and the diesel generating set are monitored by an energy management system through an IEC104 protocol of an Ethernet.
The energy storage system adopts lithium iron phosphate battery energy storage and permanent magnet synchronous flywheel energy storage, and also comprises an energy storage inverter, wherein the energy storage inverter performs power closed-loop operation during grid-connected operation, performs voltage closed-loop operation during off-grid operation, the alternating current side of the energy storage inverter is a 380V alternating current bus, the direct current side of the energy storage inverter is a 750V direct current bus, the energy storage inverter configures a low/high voltage ride-through mode in a large-scale microgrid system during grid-connected operation, and configures two modes of uninterrupted operation in a small-scale microgrid system; the energy storage inverter operates by a voltage source when the power system is in off-grid operation;
the energy storage inverter is configured with various load types and power supply types when running off the grid, a special algorithm is built in to deal with three-phase unbalanced loads and nonlinear loads, the electric energy quality of the voltage of the micro-grid is ensured, and meanwhile, the energy storage inverter has a power supply endurance prediction function;
the energy storage inverter is also provided with a small inverter for black start of the energy storage inverter from the energy storage side, and the small inverter supplies power to the alternating current contactor and an auxiliary power supply of the control circuit during the black start;
the lithium iron phosphate battery energy storage system comprises a lithium iron phosphate battery and a battery management system, wherein the lithium iron phosphate battery adopts a three-layer control structure, the first layer is a single battery control structure, the second layer is a battery cluster control structure, and the third layer is a battery array control structure;
the battery management system can reliably complete the real-time monitoring and fault diagnosis of the battery state no matter in the charging process or the discharging process of the battery, and informs the monitoring system of the energy storage system in a bus mode so as to adopt a more reasonable control strategy and achieve the aim of effectively and efficiently using the battery;
it has the analog measurement function: measuring parameters such as battery pack string voltage, charge-discharge current, temperature, single battery terminal voltage, battery pole column temperature, leakage monitoring and the like in real time;
high-precision SOC and SOH estimation: the method comprises the steps of calculating SOC values (Ah, kWh) and SOH values (%) of a storage battery grouping unit and a storage battery subsystem, charging and discharging electric energy values (kWh) and the like of the storage battery subsystem, calculating and evaluating maximum charging current, maximum discharging current and the like of the storage battery grouping unit and the storage battery subsystem, having a power failure maintaining function and having a function of uploading a monitoring system;
efficient bidirectional self-adaptive lossless active balance: through reliable collection and processing of battery information, by utilizing multiple control strategies and control algorithms, bidirectional self-adaptive active equalization is realized between battery monomers and battery modules in the battery pack, the equalizing current is larger than 5A, efficient energy transfer is realized, further, the consistency of the batteries in the battery pack and the consistency between the modules are realized, and the service life and the available capacity of a battery system are ensured;
the operation parameters are intelligently controllable: the method comprises the following steps that parameters are set through a monitoring system, wherein the parameters include but are not limited to single battery charging upper limit voltage, single battery discharging lower limit voltage, battery running highest temperature, battery running lowest temperature, battery string overcurrent threshold and battery string short-circuit protection threshold;
the battery operates the alarm function: when the battery system runs and has the conditions of overvoltage, undervoltage, overcurrent, high temperature, low temperature, electric leakage, communication abnormity, battery management system abnormity and the like, the battery management system reports alarm information, informs a PCS (personal communications System) and a background monitoring system and changes the system running strategy;
remote and local operating functions: the remote/local switch has the capability of remotely and locally cutting off a direct current breaker and a contactor, and has a remote/local switch;
battery system protection function: when a battery system runs, if analog quantity of voltage, current, temperature and the like of a battery exceeds a safety protection threshold, a battery management system sends information in time to stop a PCS (personal computer system);
and (4) a statistical function: the system has the functions of counting the times of charging and discharging of the battery and maintaining the power failure;
the eye-watching function: the method has a time setting function, and receives IRIG-B (DC) codes to meet the time setting requirement;
the communication function is as follows: the method has the communication capability of high performance, high reliability and real-time performance, and ensures the accuracy and timeliness of large data volume uploading and instruction issuing.
The energy storage device of the permanent magnet synchronous flywheel is an energy storage device for converting mechanical energy and electrical energy, breaks through the limitation of chemical batteries, realizes energy storage by a physical method, and converts and stores the electrical energy and the mechanical kinetic energy of a high-speed running flywheel through an electric/power generation reciprocal type bidirectional motor, and is connected with different types of load interfaces through frequency modulation, rectification, constant voltage and different types of load interfaces.
During energy storage, electric energy is converted through the power converter and then drives the motor to operate, the motor drives the flywheel to rotate in an accelerated mode, the flywheel stores the energy in a kinetic energy mode, the energy storage process of converting the electric energy into mechanical energy is completed, and the energy is stored in the flywheel body rotating at a high speed; then, the motor maintains a constant rotating speed until receiving a control signal of energy release; when releasing energy, the flywheel rotating at high speed drags the motor to generate electricity, current and voltage suitable for loads are output through the power converter, the energy releasing process from mechanical energy to electric energy conversion is completed, and the whole flywheel energy storage system realizes the input, storage and output processes of electric energy.
The flywheel energy storage is composed of five main components, namely a flywheel body, a bearing, a motor/generator, a power converter and a vacuum chamber.
The energy management system consists of an operation desk, an application server, Scada main and standby servers and an encryption authentication device, adopts optical fiber Ethernet to be communicated with power grid dispatching, adopts financial and communication Ethernet to be communicated with internal equipment, and adopts an IEC104 protocol as a communication protocol;
the energy management system supports the setting of power generation prediction data and power utilization prediction data by a user or scheduling setting, and calculates scheduling instructions by operating a simplex method according to the limiting conditions of each unit to realize economic operation;
the grid-connected operation management mode of the energy management system comprises the following steps:
constant power exchange mode: adjusting the feeder power at the connection position of the microgrid and the mains supply to be a constant value or a scheduling specified value;
peak clipping and valley filling mode: when the power demand exceeds the generated energy greatly in the load peak period, the energy storage system releases energy to realize peak clipping optimized operation; when the power demand is small in the load valley period and the photovoltaic power generation amount is high, the energy storage system stores energy to realize valley filling optimized operation;
stabilizing the power fluctuation mode: the fluctuation of the generated energy of the renewable energy sources is stabilized, and the adverse effect of the photovoltaic power fluctuation on the operation of the micro-grid is reduced;
power direct control mode: the method supports manual input of power dispatching instructions, and provides online and friendly information interaction for application requirements of energy storage system emergency intervention, temporary manual dispatching and the like.
The management mode of independent operation comprises that the storage battery stores energy and works in a voltage/frequency control mode, system voltage and frequency are established and maintained, under the condition that unit power of a power supply, a load and the like fluctuates, the power flow of the microgrid is automatically balanced, and when the system is lightly loaded, the residual electric energy generated by the photovoltaic in the peak period of power generation is stored by the energy storage system;
when the photovoltaic power generation power cannot meet the load requirement or the commercial power fails for a long time, the energy storage capacity of the storage battery cannot support the power supply of the microgrid for a long time, and each energy storage unit can share the load according to the capacity proportion of the energy storage unit to provide partial power compensation.
The microgrid monitoring and management system consists of a configuration monitoring platform and a distributed power supply protection and metering system;
the microgrid monitoring and management system carries out comprehensive management and control from a centralized control layer of the microgrid, a distributed power supply and a load local control layer, adopts an online configuration mode, generates a network topology structure and a node connection relation according to a graph drawn by a user, and directly realizes plug and play of each configuration element by selecting a pixel association database;
the configuration monitoring platform comprises a power generation unit monitoring step: monitoring and displaying the operating parameters such as voltage, current, power generation power and the like of each power generation unit and the operating state;
monitoring an energy storage unit: monitoring and displaying operating parameters such as voltage, current, charging power, discharging power, state of charge and the like of each energy storage unit and operating states; issuing an operation instruction of the energy storage controller, wherein the operation instruction comprises charging and discharging power and the like;
monitoring a load unit: monitoring and displaying the type of the load unit (such as sensitive load, controllable load, switchable load and the like), the name of the load, the load power, the accumulated power consumption and other operation parameters, and the operation state;
statistical analysis: the method provides flexible and rich visual contents in various forms such as graphs, tables, characters and the like, realizes intuitive, concise and convenient data management and operation, and realizes various energy management decisions based on analysis and statistical functions.
The distributed power protection comprises energy storage system protection: configuring power grid under-overvoltage protection, power grid under-over-frequency protection, islanding effect protection, output short circuit protection, direct current reverse connection protection, anti-reverse discharge protection, storage battery overcharge and overdischarge protection (direct current over-under-voltage protection), hardware fault protection, transformer over-temperature protection, module over-temperature protection, contactor fault protection, three-phase imbalance protection, phase protection and overload protection;
protecting a photovoltaic power generation system: configuring polarity reverse connection protection, short circuit protection, overload protection, island effect protection, power grid over-voltage and under-voltage, power grid over-frequency and under-frequency protection, overheating protection, ground fault, power flow calculation and protection and anti-reflux protection;
protection of a low-voltage user side: and overcurrent protection and undervoltage protection are arranged on the 0.4kV outgoing line. Configuring protection functions on the low-voltage user side comprises: overload protection, user load capacity and leakage protection can be set selectively.
The energy between the microgrid system and the power grid has the condition of bidirectional flow. When the distributed power supply is surplus, electricity needs to be sold to a power grid; when the power generation load is well matched, the energy storage system can use part of capacity to fill in the valley and cut the peak, and earn the electricity price difference; when the distributed power generation resources are insufficient, electricity needs to be taken from a power grid. In consideration of the situation, a bidirectional meter is arranged at a power supply inlet wire to measure the electricity charge settlement between the microgrid and the power grid, a bidirectional meter is arranged at a lithium iron phosphate electricity storage position and a permanent magnet synchronous flywheel energy storage position to measure the charge and discharge electricity quantity, and a single meter is arranged between the microgrid and a terminal user.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (5)

1. A photovoltaic energy storage direct current intelligent microgrid monitoring and management system is characterized by comprising a configuration monitoring platform and a distributed power supply protection and metering system, wherein the configuration monitoring platform comprises power generation unit monitoring, energy storage unit monitoring, load unit monitoring and statistical analysis;
the distributed power supply protection comprises energy storage system protection, photovoltaic power generation system protection and low-voltage user side protection;
the metering system is characterized in that a bidirectional meter is arranged at a power inlet line to meter the electricity charge settlement between the micro-grid and the power grid, a bidirectional meter is arranged at a lithium iron phosphate electricity storage and permanent magnet synchronous flywheel energy storage to meter the charge and discharge electricity quantity, and a single meter is arranged between the micro-grid and a terminal user.
2. The photovoltaic energy storage direct current intelligent microgrid monitoring and management system of claim 1, characterized in that: the power generation unit monitoring is used for monitoring and displaying voltage, current and power generation power operation parameters and operation states of each power generation unit;
the energy storage unit monitoring is used for monitoring and displaying the voltage, the current, the charging power, the discharging power and the charge state operation parameters and the operation state of each energy storage unit, and issuing an energy storage controller operation instruction;
the load unit monitoring is used for monitoring and displaying the type of the load unit, the name of the load, the load power, the running parameters of the accumulated power consumption and the running state.
3. The photovoltaic energy storage direct current intelligent microgrid monitoring and management system of claim 1, characterized in that: the energy storage system protection comprises power grid under-overvoltage protection, power grid under-over-frequency protection, island effect protection, output short circuit protection, direct current reverse connection protection, reverse discharge protection, storage battery overcharge and over-discharge protection, hardware fault protection, transformer over-temperature protection, module over-temperature protection, contactor fault protection, three-phase imbalance protection, phase protection and overload protection.
4. The photovoltaic energy storage direct current intelligent microgrid monitoring and management system of claim 1, characterized in that: the photovoltaic power generation system protection comprises polarity reverse connection protection, short circuit protection, overload protection, island effect protection, power grid over-voltage and under-voltage, power grid over-frequency and under-frequency protection, overheating protection, ground fault, load flow calculation and protection and anti-reflux protection.
5. The photovoltaic energy storage direct current intelligent microgrid monitoring and management system of claim 1, characterized in that: the low-voltage user side protection is that overcurrent protection and undervoltage protection are arranged on a 0.4kV outgoing line, and overload protection and selective setting of user load capacity and leakage protection are configured.
CN202122119234.6U 2021-09-03 2021-09-03 Photovoltaic energy storage direct current intelligent micro-grid monitoring management system Active CN216312687U (en)

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