CN109066677B - Air conditioner nonlinear group load operation active demand energy storage design method - Google Patents
Air conditioner nonlinear group load operation active demand energy storage design method Download PDFInfo
- Publication number
- CN109066677B CN109066677B CN201810973941.1A CN201810973941A CN109066677B CN 109066677 B CN109066677 B CN 109066677B CN 201810973941 A CN201810973941 A CN 201810973941A CN 109066677 B CN109066677 B CN 109066677B
- Authority
- CN
- China
- Prior art keywords
- energy storage
- energy
- air conditioner
- load
- peak
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to an air conditioner nonlinear group load operation active demand energy storage design method, and belongs to the technical field of control systems. The method closely combines the characteristics of starting, running and energy consumption of the air conditioner nonlinear group load, considers the peak shaving and dispatching reserve capacity demand pressure of a power grid, and provides a harmonic processing and energy dispatching scheme for energy storage parameter and nonlinear group load running. Firstly, calculating electric energy required by harmonic processing on the basis of analyzing harmonic components of nonlinear group load operation; and secondly, calculating peak-valley compensation energy storage capacity by combining the practical feasibility of group load energy-saving operation scheduling and the active requirements of power grid faults and peak-valley compensation electric energy. And finally, combining the two functional requirements, configuring the total energy storage capacity, and carrying out energy scheduling management design. The invention has reasonable energy storage configuration and reasonable scheduling strategy, and can realize active demand management of nonlinear group load operation.
Description
Technical Field
The invention relates to an air conditioner nonlinear group load operation active demand energy storage design method, and belongs to the technical field of control systems.
Background
In order to respond to the energy-saving policy, a plurality of air conditioner manufacturers release the variable frequency air conditioners, but the energy-saving variable frequency air conditioners are connected to the power grid in a large amount, so that a large amount of harmonic waves can be caused to the power grid, the normal operation of other equipment is influenced, and the power quality is also influenced. The non-sinusoidal current generated by the air conditioner nonlinear group load is just a harmonic source of a public power grid, and harmonic current is injected into the power grid from the harmonic source, so that harmonic voltage drop is generated on circuit impedance and is superposed with sine wave voltage, voltage waveform distortion of the power grid can be caused, and power supply electric energy quality is influenced. The mine hoist faults are that the high-order harmonic wave caused by the frequency conversion operation triggers the thyristor to be conducted, so that the system is out of control. Therefore, it is particularly necessary to design a corresponding harmonic active suppression circuit on the future power grid side or load side to achieve a power grid-friendly load target. Therefore, the monitoring and the improvement of the electric energy characteristics of the air conditioner nonlinear load connected into the power grid are very important. According to the standards proposed in IEEE Std 929-. In addition, the influence of huge air conditioning load number on the voltage stability of the power grid cannot be ignored. For example, in 2010, a large-area power failure accident occurred in brazil, the united states, and the like. The reactive shortage of the peak load can cause voltage collapse and even cause the whole system to break down. This undoubtedly brings great influence to normal social and economic order and people's daily life, has also reflected some insufficiencies in the research of present electric power system scholars to voltage stability simultaneously. The nonlinear group load operation brings harmonic waves to a power grid and simultaneously causes a large amount of energy loss, and over the years, scientific research technicians propose an active filtering technology with a good effect, but the active filtering needs a direct current power supply, and the existing technology utilizes the voltage of the power grid, dynamically rectifies the power and then provides the power for an active filter. The rectification process may bring harmonic for the second time, and then the harmonic processing power supply needs 24 hours for uninterrupted power supply, and the power consumption peak demand of the power grid is higher, which is very unfavorable for the operation of the power grid. If the harmonic power supply is stably supplied with power by the energy storage system, the time-space flexible movement characteristic of the energy storage system is utilized, and the peak load regulation pressure of a power grid can be reduced. And secondly, the load operation characteristic of the air conditioner nonlinear group has particularity, and the air conditioner nonlinear group can be flexibly stopped according to environmental control parameters. Therefore, the power grid can be stopped for a short time or a part of the units at the peak time. The energy storage power supply can also be selected to be used for a standby power supply for nonlinear group load peak operation, so that the active demand management of the nonlinear group load operation can be really realized by reasonable configuration of energy storage and reasonable design of a scheduling strategy.
Disclosure of Invention
The invention aims to provide an active demand energy storage design method for nonlinear group load operation of air conditioners, which solves the technical problems that the nonlinear group load operation of the air conditioners brings harmonic waves to a power grid, simultaneously causes a large amount of energy loss, active filtering needs a direct-current power supply, the rectification process can bring harmonic waves for the second time, the harmonic processing power supply needs 24 hours of uninterrupted power supply, the power consumption peak demand of the power grid is higher, and the operation of the power grid is very unfavorable.
The invention adopts the following technical scheme for solving the technical problems:
an active demand energy storage design method for air conditioner nonlinear group load operation comprises the following steps: step 1, analyzing harmonic components at the side of an air conditioner nonlinear group load operation power grid, dynamically inhibiting harmonic waves and compensating reactive power through an active filter, and calculating the energy storage capacity required by the active filter; step 2, analyzing the energy consumption demand quantity in the peak load time of the air conditioner nonlinear group and the energy saving quantity in the temporary shutdown time period in the peak load time of the air conditioner nonlinear group, and calculating the peak-valley compensation energy storage capacity by combining the energy consumption demand quantity and the energy saving quantity;
The preferred technical proposal of the invention is as follows: the specific steps of the step 1 are as follows: step 1.1, starting and running harmonic monitoring are carried out on a building group with fixed air conditioner load, and harmonic components at the side of an air conditioner nonlinear group load running power grid are analyzed; step 1.2, giving 24-hour current time integral to the load current of each subharmonic for calculation; step 1.3, the active filter detects load current through a current transformer, extracts harmonic components in the load current through calculation of an internal DSP, then sends the harmonic components to an internal IGBT through a PWM signal, controls an inverter to generate a harmonic current which is equal to the load harmonic current in magnitude and opposite in direction, injects the harmonic current into a power grid for filtering, and calculates the load current amount of each subharmonic; and step 1.4, calculating the energy storage capacity of the active filter according to the load current magnitude of each harmonic.
The preferred technical proposal of the invention is as follows: the specific steps of the step 2 are as follows: step 2.1, calculating the total electric energy required by 24 hours of the air conditioner nonlinear group load; step 2.2, calculating the energy consumption demand quantity required by the air conditioner nonlinear group load operation in the power grid peak time period within 24 hours; step 2.3, calculating the time interval and the number of air conditioners capable of being temporarily stopped in the peak time period of the power grid within 24 hours; step 2.4, calculating the energy-saving quantity of the temporarily stopped air conditioners in the peak time period; and 2.5, combining the required quantity of electric energy consumption required by the group load operation in the peak time period of the power grid within 24 hours with the energy-saving quantity of the temporarily stopped air conditioners to obtain the peak-valley compensation energy storage capacity.
The preferred technical proposal of the invention is as follows: the total energy storage capacity power supply charging through energy dispatching management is to charge an active filter energy storage and peak-valley compensation energy storage power supply at any time by using local load electricity surplus when a building group with fixed air conditioner load has new energy for power generation; when the building group with fixed air-conditioning load does not have new energy to generate power, the active filter energy storage and peak-valley compensation energy storage power supply are charged by utilizing the power grid power consumption low-valley period.
The preferred technical proposal of the invention is as follows: the active filter is a Satonus active power filter.
Compared with the prior art, the active demand energy storage design method for the nonlinear group load operation of the air conditioners has the following technical effects:
(1) the air conditioner load is higher than the whole power grid load, the operation time period is concentrated, and the influence on the power grid electric energy characteristic is considered. Active filtering needs the power, and the operation needs the power consumption, introduces the energy storage battery as active filter power, charges at the power consumption low ebb hour, has reduced electric wire netting day power supply pressure.
(2) The energy-saving air conditioner has the advantages that the energy-saving air conditioner is powered off midway, the environment has the characteristic of long-time energy retention, the capacity required by peak-valley supplementary energy storage is properly reduced, the energy is saved, the cost is reduced, and the peak load regulation pressure of a power grid is reduced.
(3) The energy storage capacity of the active filter comes from the time integral of the harmonic current of the actual system, and the energy storage capacity can be effectively utilized.
Drawings
FIG. 1 is a schematic diagram of an energy storage capacity configuration strategy of the present invention;
FIG. 2 is a schematic diagram of the distribution of the electrical loads of the power grid according to the present invention;
FIG. 3 is a schematic diagram of a software interface for harmonic statistics according to the present invention;
FIG. 4 is a comparison of current waveforms before and after configuration of the active harmonic of the present invention;
FIG. 5 is a voltage ripple diagram of a bus of an air conditioner inverter with no energy storage for power supply in case of grid voltage failure according to the present invention;
fig. 6 is a voltage fluctuation diagram of the bus of the air conditioner inverter configured with capacity storage active power supply according to the present invention.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings:
the specific embodiment is as follows:
as shown in fig. 1, 2 and 3, the active demand energy storage design method for the air conditioner nonlinear group load operation comprises the steps of harmonic suppression of energy storage capacity for active filtering and peak-valley compensation energy storage capacity design considering the energy supply retention characteristic of the air conditioner environment, and the method closely combines the starting, operation and energy consumption characteristics of the air conditioner nonlinear group load, considers the peak regulation and dispatching standby capacity demand pressure of a power grid, and provides an energy storage parameter and nonlinear group load operation harmonic processing and energy dispatching scheme. Firstly, calculating electric energy required by harmonic processing on the basis of analyzing harmonic components of nonlinear group load operation; and secondly, calculating peak-valley compensation energy storage capacity by combining the practical feasibility of group load energy-saving operation scheduling and the active requirements of power grid faults and peak-valley compensation electric energy. And finally, combining the two functional requirements, configuring the total energy storage capacity, and carrying out energy scheduling management design. The invention comprises the following steps: step 1, analyzing harmonic components at the side of an air conditioner nonlinear group load operation power grid, dynamically inhibiting harmonic waves and compensating reactive power through an active filter, and calculating the energy storage capacity required by the active filter; step 2, analyzing the energy consumption demand quantity in the peak load time of the air conditioner nonlinear group and the energy saving quantity in the temporary shutdown time period in the peak load time of the air conditioner nonlinear group, and calculating the peak-valley compensation energy storage capacity by combining the energy consumption demand quantity and the energy saving quantity; step 3, calculating the total energy storage capacity by combining the energy storage capacity of the active filter and the peak-valley compensation energy storage capacity; and 4, charging the total energy storage capacity power supply through energy scheduling management.
The specific steps of step 1 are as follows: step 1.1, starting and running harmonic monitoring are carried out on a building group with fixed air conditioner load, and harmonic components at the side of an air conditioner nonlinear group load running power grid are analyzed; step 1.2, giving 24-hour current time integral to the load current of each subharmonic for calculation; step 1.3, the active filter detects load current through a current transformer, extracts harmonic components in the load current through calculation of an internal DSP, then sends the harmonic components to an internal IGBT through a PWM signal, controls an inverter to generate a harmonic current which is equal to the load harmonic current in magnitude and opposite in direction, injects the harmonic current into a power grid for filtering, and calculates the load current amount of each subharmonic; and step 1.4, calculating the energy storage capacity of the active filter according to the load current magnitude of each harmonic.
The specific steps of step 2 are as follows: step 2.1, calculating the total electric energy required by 24 hours of the air conditioner nonlinear group load; step 2.2, calculating the energy consumption demand quantity required by the air conditioner nonlinear group load operation in the power grid peak time period within 24 hours; step 2.3, calculating the time interval and the number of air conditioners capable of being temporarily stopped in the peak time period of the power grid within 24 hours; step 2.4, calculating the energy-saving quantity of the temporarily stopped air conditioners in the peak time period; and 2.5, combining the required quantity of electric energy consumption required by the group load operation in the peak time period of the power grid within 24 hours with the energy-saving quantity of the temporarily stopped air conditioners to obtain the peak-valley compensation energy storage capacity.
The direct current power supply of the active harmonic wave directly adopts a hybrid energy storage battery pack 1, and a low voltage ride through and peak-valley compensation strategy adopts a hybrid battery pack 2. For a building group with fixed air-conditioning load, firstly, harmonic monitoring of starting and running is carried out, FFT components are analyzed, then, current time integral of 24 hours is given to current of each harmonic, and the total amount is calculated and used as a reference for selection of capacity of a harmonic energy storage power supply. And comparing the electric energy required by the group load operation in the peak time period of the public power grid, and taking the integral of the full load power in the peak time period as a primary reference for the capacity selection of the peak-valley compensation energy storage power supply. And the basic requirement of the comfort level of the human body and the characteristic of load fluctuation are considered in combination with the energy maintaining function and the fading delay of the air-conditioning environment. And considering the limit of energy storage technology, and properly adjusting the peak-to-valley energy storage configuration capacity.
The total energy storage capacity power supply is charged through energy scheduling management, namely when a building group with fixed air conditioner load has new energy for power generation, the energy storage power supply for the active filter and the peak-valley compensation energy storage power supply is charged at any time by using the surplus of electricity consumption of local load; when the building group with fixed air-conditioning load does not have new energy to generate power, the active filter energy storage and peak-valley compensation energy storage power supply are charged by utilizing the power grid power consumption low-valley period.
The energy storage capacity and the access time are flexibly selected in combination with the environmental temperature and humidity regulation requirements during the peak time of the power grid load operation requirement, the normal energy supply of the air conditioner load is maintained, and the power supply pressure of the power grid caused by the operation of a large number of air conditioners in the concentrated time period is buffered. The energy storage capacity required by harmonic processing is calculated on the basis of nonlinear group load operation harmonic component analysis, and the power consumption valley time is utilized for charging, so that the power consumption requirement of a power grid in the daytime is reduced. The electric energy used for harmonic wave processing does not need on-line power grid consumption, independent and flexible configuration can be selected at any time period, and the energy storage capacity of peak-valley compensation is more reasonable.
The active filter is a Satonus active power filter.
Fig. 4 shows a comparison graph of current waveforms before and after the energy storage active harmonic configuration according to the present invention. The active energy storage implementation is carried out according to the active requirement of the air conditioner nonlinear group load operation, the energy storage capacity is selected through harmonic power consumption integration, the designed active filter is embedded into a load operation system, and the harmonic component is obviously reduced to a great extent through the effects before and after filtering.
As shown in fig. 5 and 6, the bus voltage ripple diagrams of the air conditioning converter with no energy storage for power supply in power grid voltage failure according to the present invention and the bus voltage ripple diagrams of the air conditioning converter with active energy storage for capacity energy storage for power supply according to the present invention are shown. Compared with the bus voltage fluctuation of the air conditioner converter configured with capacity energy storage active power supply, the bus voltage drop of the air conditioner converter configured with capacity energy storage active power supply is obviously reduced, and the system stability is enhanced.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention, and are not intended to limit the scope of the present invention, and any person skilled in the art should understand that equivalent changes and modifications made without departing from the concept and principle of the present invention should fall within the protection scope of the present invention.
Claims (3)
1. An active demand energy storage design method for air conditioner nonlinear group load operation is characterized by comprising the following steps:
step 1, analyzing harmonic components at the side of an air conditioner nonlinear group load operation power grid, dynamically inhibiting harmonic waves and compensating reactive power through an active filter, and calculating the energy storage capacity required by the active filter;
step 2, analyzing the energy consumption demand quantity in the peak load time of the air conditioner nonlinear group and the energy saving quantity in the temporary shutdown time period in the peak load time of the air conditioner nonlinear group, and calculating the peak-valley compensation energy storage capacity by combining the energy consumption demand quantity and the energy saving quantity;
step 3, calculating the total energy storage capacity by combining the energy storage capacity of the active filter and the peak-valley compensation energy storage capacity;
step 4, charging the total energy storage capacity power supply through energy scheduling management;
the specific steps of the step 1 are as follows: step 1.1, starting and running harmonic monitoring are carried out on a building group with fixed air conditioner load, and harmonic components at the side of an air conditioner nonlinear group load running power grid are analyzed; step 1.2, giving 24-hour current time integral calculation to the load current of each harmonic; step 1.3, the active filter detects load current through a current transformer, extracts harmonic components in the load current through calculation of an internal DSP, then sends the harmonic components to an internal IGBT through a PWM signal, controls an inverter to generate a harmonic current which is equal to the load harmonic current in magnitude and opposite in direction, injects the harmonic current into a power grid for filtering, and calculates the load current amount of each subharmonic; step 1.4, calculating the energy storage capacity of the active filter according to the load current magnitude of each harmonic;
the specific steps of the step 2 are as follows: step 2.1, calculating the total electric energy required by 24 hours of the air conditioner nonlinear group load; step 2.2, calculating the energy consumption demand quantity required by the air conditioner nonlinear group load operation in the power grid peak time period within 24 hours; step 2.3, calculating the time interval and the number of air conditioners capable of being temporarily stopped in the peak time period of the power grid within 24 hours; step 2.4, calculating the energy-saving quantity of the temporarily stopped air conditioners in the peak time period; and 2.5, combining the required quantity of electric energy consumption required by the group load operation in the peak time period of the power grid within 24 hours with the energy-saving quantity of the temporarily stopped air conditioners to obtain the peak-valley compensation energy storage capacity.
2. The design method for active demand energy storage for air conditioner nonlinear group load operation according to claim 1, wherein the total energy storage capacity power supply charging through energy scheduling management is to charge an active filter energy storage and peak-valley compensation energy storage power supply at any time by using surplus power of local load when a building group with fixed air conditioner load has new energy for power generation; when the building group with fixed air-conditioning load does not have new energy to generate power, the active filter energy storage and peak-valley compensation energy storage power supply are charged by utilizing the power grid power consumption low-valley period.
3. The design method for active energy storage requirement of air conditioner nonlinear group load operation as claimed in claim 1, wherein the active filter is a Saton active power filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810973941.1A CN109066677B (en) | 2018-08-24 | 2018-08-24 | Air conditioner nonlinear group load operation active demand energy storage design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810973941.1A CN109066677B (en) | 2018-08-24 | 2018-08-24 | Air conditioner nonlinear group load operation active demand energy storage design method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109066677A CN109066677A (en) | 2018-12-21 |
| CN109066677B true CN109066677B (en) | 2021-05-18 |
Family
ID=64755933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810973941.1A Active CN109066677B (en) | 2018-08-24 | 2018-08-24 | Air conditioner nonlinear group load operation active demand energy storage design method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109066677B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807143A (en) * | 2015-05-14 | 2015-07-29 | 南通大学 | Electric-energy-friendly-based air conditioner load side active demand strategy |
| CN106374470A (en) * | 2015-07-22 | 2017-02-01 | 利思电气（上海）有限公司 | High-voltage active filtering apparatus with time-sharing energy storage |
| CN106451510A (en) * | 2016-11-11 | 2017-02-22 | 国家电网公司 | Energy storage station capacity and charge-discharge power configuring method adaptive to peak clipping and valley filling |
-
2018
- 2018-08-24 CN CN201810973941.1A patent/CN109066677B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807143A (en) * | 2015-05-14 | 2015-07-29 | 南通大学 | Electric-energy-friendly-based air conditioner load side active demand strategy |
| CN106374470A (en) * | 2015-07-22 | 2017-02-01 | 利思电气（上海）有限公司 | High-voltage active filtering apparatus with time-sharing energy storage |
| CN106451510A (en) * | 2016-11-11 | 2017-02-22 | 国家电网公司 | Energy storage station capacity and charge-discharge power configuring method adaptive to peak clipping and valley filling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109066677A (en) | 2018-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201312133Y (en) | Charging device, energy-storing device and charging station | |
| CN103427430B (en) | A kind of energy management method of mixed energy storage system in microgrid | |
| CN103595138B (en) | A kind of smart micro-grid system | |
| CN102916481A (en) | Direct-current microgrid system and energy management method thereof | |
| CN105305495A (en) | Dispatching method for multi-energy complement micro-grid system | |
| WO2023029335A1 (en) | Parameter configuration method and terminal for photovoltaic storage and charging system | |
| CN204681125U (en) | A kind of charging system for electric automobile based on solar energy | |
| CN104810842A (en) | Independent micro-grid layered coordinated control method based on different time scales | |
| CN103580052B (en) | A kind of composite energy storage power station for active distribution network and distribution method thereof | |
| CN111555329B (en) | Energy storage capacity configuration method for autonomous micro-grid | |
| CN106786889A (en) | One kind is provided multiple forms of energy to complement each other system | |
| CN115441486A (en) | Light storage charging and discharging battery replacing system and system matching method | |
| CN110380506A (en) | A kind of distributed multiple-connected battery system for prefabricated cabin formula unit equipment | |
| CN201359640Y (en) | Intelligent power supply surface observation and report machine | |
| CN117498414A (en) | System for realizing electricity saving and cost reduction of communication base station by combining photovoltaic and energy storage | |
| CN105140947A (en) | Intelligent community micro power grid cell energy storage system | |
| CN109066677B (en) | Air conditioner nonlinear group load operation active demand energy storage design method | |
| CN111816941A (en) | Energy storage integrated system of retired lithium iron phosphate power battery | |
| CN204721004U (en) | A kind of wind turbine generator testing power supply with energy storage and fictitious load | |
| CN114156924A (en) | Micro-grid source-load-storage cooperative interaction control system and method | |
| CN210016289U (en) | Redundant design energy storage system of wind-powered electricity generation field backup power | |
| CN202405795U (en) | Optimized energy storing device for wind power plant | |
| CN113394868A (en) | Multi-path energy supply energy-saving system suitable for 5G communication base station | |
| CN112713520A (en) | Off-grid wind-solar energy storage intelligent power supply system | |
| CN108377001B (en) | Photovoltaic energy storage system and method for peak clipping and valley filling of electricity consumption |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |