CN219779859U - Electric energy quality on-line monitoring device based on micro-grid - Google Patents
Electric energy quality on-line monitoring device based on micro-grid Download PDFInfo
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Abstract
Electric energy quality on-line monitoring device based on little electric wire netting relates to electric power system technical field. Comprising the following steps: the data receiving and forwarding module is connected with the micro-grid signal through an external wiring and forwards the micro-grid signal data read by the external wiring; the micro-grid-based power quality online monitoring device completely penetrates through the system omnibearing concepts of power sources, power storage, power conversion and the like. The system can continuously monitor the electric energy quality of the electric power source and upload and intervene in the condition of poor electric energy quality caused by climate reasons; the electric energy in the electric energy storage device can be continuously monitored, so that the reliability of energy storage is ensured; and finally, monitoring the electric energy quality of the electric energy after power conversion, ensuring that the electric energy transmitted to a user side is at a higher level, and if the electric energy quality after power conversion is poor, carrying out abrupt uploading of events, and asking for the first time to ensure the power supply level of the micro-grid of the upper power grid.
Description
Technical Field
The utility model relates to the technical field of power systems, in particular to an electric energy quality on-line monitoring device based on a micro-grid.
Background
Micro-grid is a small power generation and distribution system composed of distributed power supply, energy storage device, energy conversion device, load, monitoring and protecting device. In a traditional sense, a main expression form of the micro-grid is a distributed power system, and according to the electricity utilization characteristic and the user characteristic of a distribution network side, a cell transformer, a user transformer substation, a factory transformer substation and the like can be called as the micro-grid. Since the power distribution system is a power grid, an upper power grid and a lower user side are required to be accessed to achieve the purpose of power distribution. In recent years, with the increasing increase of environmental pollution and energy problems in the world today, distributed power generation technology based on clean energy and renewable energy has become an important technology for alleviating the contradiction between energy and environment. The micro-grid is used as one of the solutions, so that clean energy can be fully utilized, energy scheduling is optimized, energy utilization rate is improved, and the contradiction between industry and environment development is effectively solved.
The existence of the micro-grid effectively ensures the safe and stable electricity utilization of the power consumer. The micro-grid comprises an energy storage device, an energy conversion device and the like in composition and is used for reliably supplying power to a primary load, a secondary load and a tertiary load, and the problem is also caused:
1. electric energy storage problem of micro-grid: when the power supply capacity of the micro-grid is sufficient, stable power supply to the three grades of loads can be realized, but when the power supply capacity is insufficient, the three-grade load and the two-grade load can be cut off in sequence, so that the power supply to the first-grade load is preferentially ensured. The quantity and the quality of the power supply reserves at the moment completely bear the reliability of power supply, and if the power grid has more impurities and pollution, the power utilization safety of hospitals, enterprises, schools and the like under the primary load can be seriously influenced, so that potential safety hazards are caused;
2. micro grid power source problem: in light of the foregoing, the generation and operation of the micro-grid has positive significance for the use of clean energy and the protection of environmental protection systems, and the power source of the micro-grid is necessarily classified as clean energy. At present, most of clean energy utilization rates in China are wind energy, water energy, photovoltaic and the like, micro-grids are power distribution side systems, and serve urban or residential users, so that the photovoltaic systems are more. However, the sustainability, effectiveness and reliability of the power source of the photovoltaic system are all the time an urgent problem to be solved in international power. Because the photovoltaic power source is unstable and is easily influenced by natural factors such as climate, sunlight and the like, the quality of power reserve and direct power source cannot be effectively ensured;
micro grid power conversion problem: the micro-grid comprises a power energy storage device and an energy conversion device, which are used for converting stored power, so that a user side can be accessed to supply power to the user, and how the converted power quality is completely dependent on the self factors of the device. If the energy is converted for a long time and a long time, the problem of power quality caused by uncertain faults of the device is avoided, so that the power utilization experience of a user side is affected, and potential power hazards are caused.
The micro-grid is generated for improving the power utilization rate of the distribution network side and utilizing clean energy, so that the power quality of the user side and the positive benefit to the environment are ensured. However, the above problems also exist objectively, so when designing a distributed power system of a micro-grid, people often add an electric energy meter for monitoring electric energy levels of power storage and power conversion so as to solve the above problems, but the use of the electric energy meter cannot completely solve the above problems:
1. for the first point: the micro-grid electric energy storage depends on an energy storage device in the distributed power supply, which can be a battery or an electric power storage medium after passing through an energy conversion device, however, an electric energy meter can only monitor the electric energy information and the electric energy quality of stored energy at the time and cannot monitor and intervene electric energy of a subsequent energy storage device;
2. for the second point: micro-grid power comes from clean energy, more depends on photovoltaic conversion, however, photovoltaic is limited by climate level, and an electric energy meter can only monitor electric energy quality under the condition of power source when the climate level is normal, but cannot continuously and effectively monitor when no power source exists;
3. for the third point, the micro-grid power is converted and then converted power is transmitted to the user side, however, the electric energy meter cannot evaluate the quality of the converted power in the power conversion, only the power level stored before the conversion is reserved, and therefore the reliability of the converted power cannot be guaranteed.
Disclosure of Invention
Aiming at the problems, the utility model provides the micro-grid-based power quality on-line monitoring device which reduces the operation and maintenance cost and improves the energy utilization rate.
The technical scheme of the utility model is as follows: electric energy quality on-line monitoring device based on little electric wire netting includes:
the data receiving and forwarding module is connected with the micro-grid signal through an external wiring and forwards the micro-grid signal data read by the external wiring;
the classification module is communicated with the data receiving and forwarding module, and the data receiving and forwarding module forwards the power grid data to the classification module; the classification module is used for processing and classifying the received data;
the storage module is communicated with the detection module and is used for sending the power grid data processed by the classification module to the storage module;
and the mutation uploading module is communicated with the classification module and feeds the received problem data back to the external user and the upper power grid preferentially.
Specifically, the classification module comprises a three-phase voltage monitoring module, a three-phase current monitoring module, a voltage deviation monitoring module, a frequency deviation monitoring module, a flicker monitoring module, a transient event monitoring module and a three-phase unbalance monitoring module.
Specifically, the data receiving and forwarding module comprises a data receiving circuit, a data integrating circuit and a signal forwarding circuit.
Specifically, the abrupt change uploading module comprises a data receiving circuit and a signal forwarding circuit, and is used for receiving the problem data and forwarding the problem signal to the outside.
The utility model provides an on-line monitoring device for electric energy quality based on a micro-grid, which is characterized in that a distributed power system is used as a main carrier, a power source and clean energy (mainly aiming at photovoltaic in the scheme) are used as main power supply means, and a power energy storage device and an energy conversion device are used as main power supply means for directly supplying power to users at a distribution network side. From this, it can be known that:
firstly, the power grid attribute of the micro-grid belongs to clean energy, but also belongs to the distribution network side, so that the possibility of generating problems in the electric energy quality due to a plurality of users is greatly improved;
secondly, the internal operation mechanism of the micro-grid lacks monitoring and intervention of power quality, and the exact level of power supply cannot be ensured.
According to the characteristics, the utility model provides an on-line monitoring device for the electric energy quality based on a micro-grid.
1. Firstly, the power quality on-line monitoring device can be directly connected to a power supply bus of a micro-grid, and can switch the power supply receiving voltage of the power quality on-line monitoring device according to the local power supply level, and the power supply receiving voltage can be adjusted to 220V or 110V;
2. secondly, the micro-grid is a grid at the distribution network side, and is different from the main station, and the monitoring points to be monitored and the data requirements of the monitoring points are different. Therefore, aiming at a micro-grid system, the monitoring points are limited to seven types of three-phase voltage, three-phase current, voltage deviation, frequency deviation, flicker, transient event and three-phase unbalance, an abrupt uploading function is developed according to the characteristics of the micro-grid, and abrupt uploading is performed when the electric energy quality problem occurs in any link, so that most of information of the micro-grid power supply quality is basically covered;
finally, the micro-grid-based power quality online monitoring device completely penetrates through the system omnibearing concepts of power source, power storage, power conversion and the like. The system can continuously monitor the electric energy quality of the electric power source and upload and intervene in the condition of poor electric energy quality caused by climate reasons; the electric energy in the electric energy storage device can be continuously monitored, so that the reliability of energy storage is ensured; and finally, monitoring the electric energy quality of the electric energy after power conversion, ensuring that the electric energy transmitted to a user side is at a higher level, and if the electric energy quality after power conversion is poor, carrying out abrupt uploading of events, and asking for the first time to ensure the power supply level of the micro-grid of the upper power grid.
Drawings
Figure 1 is a schematic diagram of an on-line monitoring device for the power quality based on micro-grid,
figure 2 is a flowchart of the micro-grid power quality on-line monitoring device,
figure 3 is a schematic diagram of a data receiving circuit,
figure 4 is a schematic diagram of a data integration circuit,
figure 5 is a schematic diagram of a signal forwarding circuit,
fig. 6 is a schematic diagram of a snap-up circuit.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
The utility model is described with reference to fig. 1-6;
electric energy quality on-line monitoring device based on little electric wire netting includes:
the data receiving and forwarding module is connected with the micro-grid signal through an external wiring, and forwards the micro-grid signal data read by the external wiring through an internal circuit wiring;
the system comprises a classification module, a data receiving and forwarding module, a power grid data three-phase voltage monitoring module, a three-phase current monitoring module, a voltage deviation monitoring module, a frequency deviation monitoring module, a flicker monitoring module, a transient event monitoring module and a three-phase unbalance monitoring module, wherein the data receiving and forwarding module forwards seven types of power grid data to the classification module; the classification module is used for processing and classifying the received data and transmitting the data to the storage module;
the storage module is communicated with the detection module and is used for sending the power grid data of the classification module to the storage module;
and the abrupt change uploading module is communicated with the classification module and is used for feeding the received problem data back to an external user and an upper power grid preferentially so as to realize the preferential transmission of the power quality problem.
Further defined, the classification module includes a three-phase voltage monitoring module, a three-phase current monitoring module, a voltage deviation monitoring module, a frequency deviation monitoring module, a flicker monitoring module, a transient event monitoring module, and a three-phase imbalance monitoring module. The seven modules have the meaning of classifying the data and then can be displayed separately in the background.
If the power grid data is free of errors after passing through the classification module, the power grid data is directly output to an external user and stored through the internal storage module. If the power grid data has obvious power quality problems, the seven classification modules can transmit the problem data to the mutation uploading module, and the mutation uploading module can feed the problem data back to an external user and an upper power grid preferentially after receiving the problem data, so that the preferential transmission of the power quality problems is realized.
The classification module comprises a three-phase voltage monitoring module, a three-phase current monitoring module, a voltage deviation monitoring module, a frequency deviation monitoring module, a flicker monitoring module, a transient event monitoring module and a three-phase unbalance monitoring module; the three-phase voltage monitoring module, the three-phase current monitoring module and the voltage deviation monitoring module are realized through a detection module with the model ZLBM-I2; the frequency deviation monitoring module, the flicker monitoring module, the transient event monitoring module and the three-phase unbalance monitoring module are realized through a model ZLDU-02 detection module.
Further defined, the data receiving and forwarding module includes a data receiving circuit, a data integrating circuit, and a signal forwarding circuit.
Further defined, the abrupt uploading module includes a data receiving circuit and a signal forwarding circuit for receiving the problem data and forwarding the problem signal to the outside.
In a daily working environment, the three-phase voltage, three-phase current, voltage deviation, frequency deviation, flicker, transient event and three-phase unbalance are mainly monitored (7 types are feedback of the most visual electricity quality of a user side). When the phenomenon of exceeding the standard occurs in the seven monitoring contents, the data integration circuit firstly judges whether mutation uploading is needed or whether the data has no reference value; and secondly, when the signal forwarding circuit receives the electric signal of the data integration module and confirms that the electric network is true, fault data are directly transmitted to the abrupt change uploading module through the circuit. Then, the mutation uploading function is immediately used, the exceeding information is suddenly uploaded to a micro-grid superior user, the electric energy quality information in the latest time period is accurately transmitted, the decision-making is assisted in the treatment of the electric energy quality pollution, and the working efficiency is greatly improved.
As shown in fig. 2, the micro-grid system is composed of a distributed power system, an energy storage device and an energy conversion device, wherein the distributed power system further comprises photovoltaic power input, monitoring and some conventional components. After the micro-grid system is connected, the embedded structure is connected with the distributed power system, the energy storage device and the energy conversion device respectively as can be seen from the figure. When the microgrid starts to operate:
1. firstly, photovoltaic input is needed, and when the photovoltaic input is performed, the photovoltaic input is directly connected to a distributed power system, so that the electric energy quality information during electric power input can be intuitively obtained;
2. then, when the energy storage device is not required to discharge three types of loads at ordinary times, the electric energy quality level of the energy storage device is monitored in the whole process by the device, a log is formed periodically for uploading, and the electric energy quality stored by the energy storage device as a standby power supply replaces a normal power supply at critical time, so that the situation of power supply danger cannot occur;
3. finally, when the distributed power supply system works normally, an energy conversion device is needed to convert the photovoltaic into the user power for distribution network transmission, at the moment, the device monitors the whole process in an intervention way, monitors the real-time electric energy quality in an important way, and performs abrupt uploading when exceeding standards or other major events occur, so that the upper power grid can know the real power supply level of the micro power grid.
The micro-grid-based power quality on-line monitoring device is specially customized because the characteristics of the micro-grid are clean power attributes and the requirements on the complexity of the power quality on-line monitoring device are not high due to the characteristics of the distributed power system, so that the micro-grid-based power quality on-line monitoring device ensures the basic function of the micro-grid on-line monitoring, develops the special function according to the characteristics of the micro-grid, greatly saves the waste of a power system, greatly reduces the operation and maintenance cost in the future, improves the energy utilization rate and has positive effects on environmental protection.
For the purposes of this disclosure, the following points are also described:
(1) The drawings of the embodiments disclosed in the present application relate only to the structures related to the embodiments disclosed in the present application, and other structures can refer to common designs;
(2) The embodiments disclosed herein and features of the embodiments may be combined with each other to arrive at new embodiments without conflict;
the above is only a specific embodiment disclosed in the present application, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (4)
1. Electric energy quality on-line monitoring device based on little electric wire netting, its characterized in that includes:
the data receiving and forwarding module is connected with the micro-grid signal through an external wiring and forwards the micro-grid signal data read by the external wiring;
the classification module is communicated with the data receiving and forwarding module, and the data receiving and forwarding module forwards the power grid data to the classification module; the classification module is used for processing and classifying the received data;
the storage module is communicated with the detection module and is used for sending the power grid data classified by the classification module to the storage module;
and the mutation uploading module is communicated with the classification module and feeds the received problem data back to the external user and the upper power grid preferentially.
2. The micro-grid-based power quality online monitoring device of claim 1, wherein the classification module comprises a three-phase voltage monitoring module, a three-phase current monitoring module, a voltage deviation monitoring module, a frequency deviation monitoring module, a flicker monitoring module, a transient event monitoring module, and a three-phase imbalance monitoring module.
3. The micro-grid-based power quality online monitoring device of claim 1, wherein the data receiving and forwarding module comprises a data receiving circuit, a data integrating circuit and a signal forwarding circuit.
4. The micro-grid-based power quality on-line monitoring device of claim 1, wherein the abrupt uploading module comprises a data receiving circuit and a signal forwarding circuit for receiving problem data and forwarding problem signals to the outside.
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| CN202321140685.0U CN219779859U (en) | 2023-05-12 | 2023-05-12 | Electric energy quality on-line monitoring device based on micro-grid |
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