Analysis of the application of power management system: low carbon and energy saving as the main direction

1. Introduction

Power consumption monitoring and management refers to: using modern electronic technology, communication technology, computer and network technology and power equipment to combine the monitoring, protection, control, metering and work management of the power supply department under normal and accident conditions of the distribution network, improve the quality of power supply, establish a closer and more responsible relationship with users, meet the diversity of user requirements at a reasonable price, and strive to achieve the best economic power supply and more effective enterprise management. Factory power consumption monitoring and management includes all functional data flows and controls related to the distribution system in the enterprise. It mainly includes the following two aspects: 10KV and low-voltage feeder automation. Feeder automation completes the monitoring, control, fault diagnosis, fault isolation and network reconstruction of the feeder line. Its main functions include: operating status monitoring, remote control and local autonomous control, fault area isolation, load transfer and power supply restoration, reactive power compensation and voltage regulation, etc. Distribution/substation automation. Substation automation refers to an automation system that uses automatic control technology and information processing and transmission technology to monitor, measure and operate substations instead of manual operations through computer hardware and software systems or automatic devices. Substation automation, marked by signal digitization and computer communication technology, has entered the field of traditional substation secondary equipment, bringing about tremendous changes in substation operation and monitoring, and achieving significant benefits. The basic functions of substation automation include: data acquisition, data calculation and processing, over-limit and status monitoring, switch operation control and locking, information exchange with relay protection, coordination and cooperation of automatic control, information exchange with other automation devices in substations, and communication with dispatching control center or centralized control center. In recent years, a large number of distribution and substations have adopted substation automation equipment, showing significant economic benefits. 2. Direct economic benefit analysis 1. Improve power supply quality With the advent of the information age, more and more computer equipment requires uninterrupted power supply, which puts higher requirements on power supply. Power outages or power restrictions will lead to reduced production, while sudden power outages will harm important equipment in the factory. The backward manual power distribution method is not applicable to modern manufacturing industry. Only by realizing distribution automation can the power supply quality be maximized to meet the needs of people's daily life, work and production. The realization of distribution station automation can improve the reliability of power supply. The automation of distribution stations can reduce the number of failures, narrow the scope of accidents, shorten the time of accidents, and provide an effective basis for restoring power supply, quickly analyzing, diagnosing, and reporting the causes of accidents. Before a factory adopted distribution automation, the number of failures per month was 1, the emergency repair time was 2 hours, the output value of goods per hour was 5,000 yuan, and it was in operation for 11 months a year. The production loss caused by power outages can be reduced by 2*1*5000*11=110,000 yuan per year. After adopting the power consumption monitoring and management system, the number of failures can be greatly reduced, and the hidden dangers of the equipment can be discovered before the failure occurs. There is no need for a comprehensive power outage for maintenance, and the production equipment can be kept running, which can reduce losses by 110,000 yuan per year. 2. Economic benefits of reducing network loss rate According to the successful experience of the operation of domestic power consumption monitoring and management systems, the network loss rate can be reduced by more than 3% through voltage and reactive power optimization control. The annual electricity consumption of a factory is 10 million KWh. Through voltage and reactive power optimization control, 300,000 KWh of electricity can be saved each year. The energy saving benefit is calculated at 0.42 yuan/KWh, saving 126,000 yuan per year. From this point of view, the direct economic benefits are very huge, and the indirect economic and social benefits are even greater. 3. Economic benefits of equipment management The benefits of the power monitoring and management system are also largely reflected in the management of power distribution equipment. For example, if there is no corresponding power distribution automation monitoring and management system, all equipment will be regularly inspected and maintained at a certain period of time. The workload is huge and consumes a lot of manpower and material resources. The use of the power distribution management system can make equipment maintenance more targeted. Change fault repair to status repair, change manual inspection to automatic fault maintenance, reduce the labor intensity of maintenance personnel; reduce the number of operators; enhance the maintenance-free nature of the power system. By monitoring the load and distributing the load reasonably, the investment in power supply equipment can also be protected to the maximum extent. It is conducive to improving the safety and health level of equipment and extending its service life. A factory loses 60,000 yuan every year due to accidents such as burning power equipment and power equipment (the value of a transformer is more than 100,000 yuan, the value of a 10KV switch cabinet is between 50,000 and 80,000 yuan, and the value of motors ranges from several thousand to tens of thousands. High-voltage motors are more expensive, and other circuit breakers, contactors, relays , and equipment are more numerous and should be more easily burned). After the realization of power distribution automation, such accidents can be completely avoided, saving 60,000 yuan in equipment maintenance costs each year. 4. Improve the management level of enterprise electricity consumption Traditional electricity consumption management is achieved by the experience of electricians (i.e. experience management), and the quality of its management depends on the experience, sense of responsibility, and mood of electricians. In the manufacturing industry in the Pearl River Delta, electricians are called "electrician bosses". They are very important figures in the company. Even some management systems of the company have to give the green light to "electrician bosses" because the boss knows that the mood of "electrician bosses" can affect the company's electricity costs. However, "electrician bosses" only play the role of ensuring electricity consumption for factories, and there is no talk of safe, reliable (quality), and efficient electricity consumption management. The power consumption monitoring and management system is a set of power consumption management means in the information age provided to modern factories. It can accurately and timely provide real-time data and information; it can intuitively monitor the operation of any place and any equipment in the whole factory, conveniently control the planned power outage and power supply, and realize overall control. Provide an effective basis for users to adjust the peak and valley periods of power consumption. The on-duty electrician can monitor the operation status of the system in real time through the computerized interface; the maintenance electrician can carry out targeted maintenance and repair of the equipment according to the warning prompts on the screen; the electrical engineer can formulate maintenance, overhaul and rectification plans through system reports and analysis curves; the management representative can calculate and control the production cost according to the detailed power statistics report; and provide sufficient and complete data information for the enterprise ERP. On the basis of not increasing personnel costs, the management level is greatly improved. 5. Save personnel costs The power consumption monitoring and management system makes the responsibilities of electricians clearer, the levels more distinct, and the division of labor more specific. It requires fewer and more refined operation and maintenance personnel. The experience of the power system: a factory 35KV substation saves 1/3 of the personnel before automation. 3. Indirect economic benefits With the widespread application of power electronic products (such as: inverters, computers, electronic ballasts, etc.), it also brings pollution to the power supply . Among them, harmonics and electromagnetic interference have the most serious impact on the environment and equipment. 1. The power consumption monitoring and management system can diagnose problems that have troubled the company for a long time and are difficult to solve, such as: bottlenecks in product qualification rates, short life of computers and power control equipment, and other problems that are usually difficult to find and solve. 2. Since the system's monitoring host is generally installed in an office or duty room, it is some distance away from electrical equipment (especially high-voltage equipment), which will reduce the number of front-line personnel such as duty officers, operators, and maintenance workers from the possible range of occupational diseases, reduce the incidence of employees in the power transmission and distribution system, reduce the medical burden of the enterprise, and improve the quality of life of employees. 4. Conclusion











































The economic benefits of the power monitoring and management system have always been a matter of opinion. It undoubtedly has strong economic benefits. If the annual direct economic benefit output is defined as

S=(J+L+W)*T

J=power outage loss caused by maintenance each year, (the above assumption is 110,000 yuan)

L=electricity waste caused by network loss each year, (the above assumption is 126,000 yuan)

W=equipment maintenance cost saved each year, (the above assumption is 60,000 yuan)

T=equipment operation life

Then, the annual economic benefit output increases by 296,000 yuan, and the longer the operation time, the more obvious the economic benefits.

In addition, it has more important social benefits. Reducing the working time of humans in strong electric fields is of great significance to the health of practitioners, and can avoid many occupational diseases and man-made electric shock accidents. Some workers who work in power plants, substations, and distribution stations for a long time have a high incidence of dizziness, palpitations, infertility, low blood pressure, diabetes, leukemia (blood cancer), lung cancer, brain tumors (cancer), etc. The cause of the disease is related to long-term radiation in strong electromagnetic fields. In modern factory power supply systems, the use of power monitoring and management systems can not only reduce these health problems as much as possible, but also generate huge economic benefits, which is undoubtedly the general trend.