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Application of power demand side management and intelligent power monitoring technology in photovolt

time:2017-09-06 16:11:27source:Ziqi compressorauthor: 赵疆昆Clicks: 0
Core Tip: First, the analysis of the characteristics of electricity users in the industry Cement manufacturing under the non-metallic mineral manufacturing industry directory of cement, lime and gypsum manufacturing industry, is heavy industry, refers to

 

First, the industry user electricity characteristics analysis

The food and beverage industry can be subdivided into agricultural and sideline food processing industries (including grain milling, feed processing, vegetable oil processing, slaughtering and meat processing, fruit and vegetable processing, etc.) according to the national production industry, food manufacturing industry (including bakery products manufacturing, convenience foods Manufacturing, canning, etc.), beverage manufacturing (including the manufacture of wine, soft drinks, etc.).

The main agricultural and sideline products processing processes: raw materials - slaughtering - cooling - cutting - processing - processing - cooking - cooling - sterilization - frozen - Packaging - custody.

Canned fruits and vegetables processing mainly for the production process: cleaning - pre-treatment - pre-cooling - frozen - Canning - Sealing - sterilization - rubbing tank - storage.

The main electrical characteristics of the industry for pipeline operations; continuous operation of refrigeration equipment; fruits and vegetables seasonal seasonal electricity production significantly; export-oriented and strong demand during the contract period.

Second, the industry users participate in the peak load capacity analysis

1. The large and medium-sized enterprises in this industry basically work in three shifts for 24 hours. The load on electricity is relatively stable, with little difference between peak and trough. Small-scale enterprises to a class system, the general production time is 8: 00 ~ 17: 00. The industry according to different production situations, production shifts will be flexible.

2. Because the industry is an important industry related to people's livelihood, the general situation in the power grid for electricity into a serious level, the industry involved in peak power supply.

3. The industry's ability to shift peak emergency weak. In the case of emergency peak shifting power supply, the equipment suitable for power limitation mainly includes non-productive loads such as office, lighting and air-conditioners, auxiliary production loads such as cleaning, packing and storage.

4. The industry is more suitable for the shift off to participate in the period of peak shifting power, but to ensure its freezing, storage and other equipment load.

Third, the industry users involved in the peak load power technology solutions

(A) gap level IV level participation program

1. Staggered peaks

Taking into account the user characteristics of the industry, first advocate users to save electricity:

1) better natural lighting corridors, access roads, toilets and other places prohibited from turning on the lights;

2) the office lights open a stop; the indoor temperature is higher than 30 ℃ before turning on the air conditioning, air conditioning temperature setting is not less than 28 ℃;

3) to reduce the standby time of office equipment: office equipment, including computers, printers, fax machines, copiers and drinking fountains. After the work is completed, all the electrical equipment in the office should be shut down in time to prevent the office electrical equipment from being on standby.

4) Turn off the landscape lighting.

2 emergency peak

During the period from 8:00 to 22:00, non-productive loads such as lighting, office air-conditioners and office loads are reduced; unproductive loads such as office lighting, office air conditioners, office loads and landscape lighting are suspended between 18:00 and 22:00.

(B) Gap level III participation program

1. Staggered peaks

On the basis of the implementation of the IV plan, auxiliary production loads such as lighting, air conditioners, fans, cleaning (cleaning fans, pumps, washing machines, etc.) and packaging and storage (cleaning machines, conveyors, packaging machines, etc.)

2 emergency peak

On the basis of the implementation of the IV plan, auxiliary production loads such as lighting, air conditioners, fans, cleaning (cleaning fans, pumps, washing machines, etc.) and packaging and storage (cleaning machines, conveyors, packaging machines, etc.)

(C) Gap level II level participation program

1. Staggered peaks

On the basis of the implementation of the Level III program, reduce or discontinue the pretreatment (classifier, hoist, slicer, dicing machine, shaker, processor, rinse machine, conveyor belt, mill, etc.) Machine, meat grinder, filling machine, dryer, cooking machine, electric oven, cranes, playing wheat machine, etc.), canning and sealing (code machines, vacuum pumps, sealing machines, etc.) Press, etc.) and other production load.

2 emergency peak

Continue to implement the Level III program.

(D) Gap level I-level participation in the program

1. Staggered peaks

On the basis of the implementation of the level II program, all the pre-treatment (grading machine, hoist, slicer, dicing machine, shaker, processor, rinsing machine, conveyor belt, mill, etc.) , Meat grinder, filling machine, dryer, cooking machine, electric oven, cranes, playing the machine, etc.), canning and sealing (code machines, vacuum pumps, sealing machines, etc.) Machine, etc.) and other production load.

2 emergency peak

Continue to implement the Level III program.

Fourth, the industry users participate in the peak load risk and precautions

However, due to the particularity of the products in this industry, the power failure time of the refrigeration equipment is within 1 hour, and the shutdown of any one of the production lines in the assembly line will result in the backlog of the intermediate products in the upstream and downstream processes, forcing the entire Production halt, stop production of raw materials and intermediate products will occur during the deterioration, resulting in product quality does not meet the standards, product scrapped.

Therefore, when the industry participates in the peak power rationing, enterprises should, according to their actual conditions, formulate an internal contingency plan scientifically and reasonably, take the initiative to cooperate with the implementation of the peak load and power cut-off and make preparations in advance to minimize the losses.

Fifth, the smart power monitoring functions and applications

5.1 Project Introduction

Zhengzhou Ding Jin food is Master Kong holding company built in Zhengzhou, a drinks company. The company a total investment of 40 million US dollars, the registered capital of 18 million US dollars, mainly engaged in Master Kong drinks series of production and sales. Has a 0.4KV distribution room, a single 4-transformer power supply. Zhengzhou Ding Jin Food Co., Ltd. and Henan Province, Zhengzhou Power Company signed a power supply agreement. The Company's power supply and distribution project was designed and completed by Henan Chenyuan Power Engineering Co., Ltd. The details of power supply and distribution loop information are: four 0.4kV low-voltage incoming circuits, eight capacitive compensation circuits and 83 0.4kV low-voltage outgoing circuits.

5.2 network structure diagram

0.4KV on-site distribution room, 4 single transformer power supply, 4 0.4kV low-voltage incoming circuit, 8 capacitor compensation circuit, 83 0.4kV low-voltage outlet circuit. The project with a 8-port serial server, set 5 field bus, each bus connection 15-25 meters.

5.3 system functions

5.3.1 A system diagram

Power monitoring system data acquisition device to collect on-site power monitoring instrument data, and displayed in the system once the graph. As shown in the figure below, the three-phase current, three-phase voltage, active power, reactive power, power factor, active energy and other electrical parameters of all loops are refreshed and displayed in real time, which can directly reflect the operation status of each inlet and outlet circuit of the system.

5.3.2 Trend Curve

The major circuit current, power real-time trend display and historical trend inquiry function. Select the loop, the loop real-time trend curve will continue to refresh, select the "start time" to view the loop historical trend curve, select the "length of time" to view the history of the day, month and year trend curve can be more intuitive to reflect the operation of the loop Happening.

5.3.3 electricity consumption report

Various distribution room in accordance with the various circuits in the historical data query. Select the loop, you can choose the time interval, the length of the loop for accurate historical data query, including voltage, current, power, power factor and power and other common data. Query results can be exported into EXCEL form for saving, can also print save. The name of each distribution circuit in the plant area can be modified at any time, just enter the name you want to change in the corresponding position of the system to complete the operation.

5.3.4 user account and rights management

For different levels of users, set different permissions to prevent human misuse caused by the loss of production and life, to achieve the distribution system safe and reliable operation. You can log in through the user management, user logout, modify the password, add and delete operations, user-friendly account and permissions changes.

Sixth, the main monitoring product

(1) High-voltage circuit or low-voltage incoming circuit selected ACR330ELH meter

The table for the power quality analysis instrument, the main functions are: LCD display, all the electrical parameters of the measurement (U, I, P, Q, PF, F, S); four quadrant energy metering, complex rates of energy statistics; THDu, THDi, 2-31 times each harmonic component; voltage crest factor, telephone waveform factor, current K coefficient, voltage and current unbalance calculation; grid voltage and current positive and negative, zero sequence component (including negative sequence current) measurement; 4DI + 3DO (DO3 overvoltage, undervoltage, overcurrent, unbalanced alarm); RS485 communication interface, Modbus protocol or DL / T645 protocol. Overall dimensions: 120 × 120mm, hole size: 108 × 108mm. For high-pressure important circuit or low-voltage incoming cabinet.

(2) low-voltage contact or outlet circuit selected ACR220EL power meter

The table main functions are: LCD display, all the electrical parameters of the measurement (U, I, P, Q, PF, F); four quadrant energy metering, multi-rate energy statistics, the maximum demand statistics; 4DI + 2DO; RS485 communication interface , Modbus protocol. Overall dimensions: 96 × 96mm, hole size: 88 × 88mm. For low-voltage contact cabinet, outlet cabinet.

(3) Low-voltage outlet cabinet election ARD series

The table measures three-phase current, fixed value inquiry, setting value, overload, phase failure (unbalanced), stalling, underload, external fault, blocking, undervoltage and other protection functions, 8DI +4 DO, power management, leakage protection , SOE records, a variety of start-up mode, RS485 communication interface, MODbus protocol / Profibus-DP protocol optional.

(4) Energy-saving products Optional rail table or APF active filter device

Lighting box DDSF1352 meter main functions: current specifications 1.5 (6) A, 5 (20) A, 10 (40) A, 20 (80) A optional, multi-rate energy statistics, power pulse output, RS485 communication interface, Modbus Protocol or DL / T 645 protocol optional. Dimensions: 76 × 89 × 74mm, 4 modulus. Suitable for lighting box current, voltage measurement; single-phase energy measurement.

DTSF1352 rail meter main functions: current specifications 1.5 (6) A, 5 (20) A, 10 (40) A, 20 (80) A optional multi-rate energy statistics, electrical energy pulse output, RS485 communication interface, Modbus Protocol or DL / T 645 protocol optional. Overall dimensions: 126 × 89 × 74mm, 7 modulus. Three-phase energy metering for lighting boxes.

DTSD1352 rail meter main functions: LCD display, all the electrical parameters of the measurement (U, I, P, Q, PF, F, S); four quadrant energy metering, multi-rate energy statistics, the maximum demand statistics; 6) A, 5 (20) A, 10 (40) A, 20 (80) A optional, RS485 communication interface, Modbus protocol or DL / T 645 protocol optional. Overall dimensions: 126 × 89 × 74mm, 7 modulus. Suitable for power cabinet.

ANAPF series of active power filter devices, connected to the grid in parallel, through the real-time detection of the load harmonic and reactive components, the use of PWM converter technology, from the converter to generate a current harmonic component and the reactive component corresponding Of the reverse component and real-time injection into the power system, in order to achieve harmonic control and reactive power compensation.


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