As an important part of the new energy power station, the distributed photovoltaic power station can be installed according to local conditions to achieve local consumption, and has good economic and social benefits, but in recent years, with the continuous improvement of the installed capacity of distributed photovoltaic, some problems have been exposed in the operation of the systemFines are incurred for failure to meet the power factor
A project is located in the Jiangsu and Zhejiang regions where distributed photovoltaic is more developed, with an installed capacity of 6MW on the roof of the factory, and the existing 38 inverters are converted to a 10kV grid-connected point after being boosted by the transformer, and the new 10kV outlet line of the original 35kV substation in the plant is connected, and the photovoltaic mode is "self-generation and self-consumption, surplus power is connected to the Internet", and the assessment point is located in the 35kV incoming lineAfter photovoltaic investment, the power factor is lower than the requirements of the State Grid and the power adjustment fee is generated.
CET provided itPMC-1606+HDMI in-situ control display schemeThe built-in power factor closed-loop adjustment strategy is connected to the inverter, assessment point meter and other equipment, and the dynamic closed-loop adjustment of the inverter is taken as the target value of the assessment power factor, so as to balance the active and reactive power output of the inverter, take into account the economy of power generation, and ensure that the power factor meets the assessment requirements of the power grid.
Comparison of system operation before and after the power factor adjustment system is put into operationThe effect of power factor management is remarkable: Before the average power factor adjustment of the day, after adjustment。(Assessment value: 0.)9）
Statistics of the on-site power factor and force adjustment fee (the force adjustment fee is a fine, and a negative is a reward) found that after the power factor adjustment strategy was put into operation in September, the adjustment effect was obviousEffectively improve economic benefits for customers
In accordance with the "Regulations on the Administration of Power System Voltage and Reactive Power", the "Management of Power Factor and Reactive Power Compensation Equipment of Power Users" stipulates that:
Article 12: The power supply bureau may refuse to supply electricity to any new user whose power factor does not meet the requirements".
Article 14: For power users whose power load does not meet the requirements of Article 12, the power factor assessment and electricity fee adjustment shall be carried out in accordance with the relevant provisions of the "Measures for Adjusting Electricity Charges by Power Factor" approved by the state".
For example, for a factory with a monthly electricity consumption of 1.5 million kWh, the power factor is 09. The actual power factor is 087, a month of force adjustment charges penalty in 1About 90,000 yuan.
P.S: 09 is the standard value of the power factor adjustment electricity tariff table as follows.
After the distributed photovoltaic power station is put into operation, why is the power factor not up to standard?
After the photovoltaic power station is put into operation, the power grid and photovoltaic can be regarded as two power supply points, both power sources can supply power to the load, but in the mode of "self-generation and self-consumption, surplus power grid", photovoltaic gives priority to supplying power to the load, and the surplus power that cannot be consumed on the spot is integrated into the power grid.
When the load PF is stable, with the increase of photovoltaic output P2, the active P1 obtained by the load from the grid will be reduced (P1 is negative when the surplus power is connected to the grid), and the reactive power Q1 obtained from the grid should also be reduced theoretically, and the reactive power compensation in the enterprise power station or the photovoltaic power station provides reactive power, but in actual operation, due to the insufficient reactive power compensation capacity in the station and the failure of intelligent switching, the power station still needs to obtain a large amount of reactive power Q1 from the power gridThis results in a decrease in the power factor
CET launchedPMC-1606 Optical Storage Policy Control GatewayIt can provide customers with power factor management solutions suitable for distributed photovoltaic power stations to achieve efficiency increase and cost reduction.
PMC-1606 is an optical storage policy control gateway integrating remote motor, 4G communication, longitudinal encryption, lightweight monitoring and other functions, with built-in AGC **C, web configuration and other APPs independently developed by CET, which can meet the real-time control and monitoring needs of distributed photovoltaic and energy storage systems, and is widely used in distributed photovoltaic power stations, energy storage container battery prefabricated cabins, campus microgrids and virtual power plants.
The assessment meter and inverter are connected to PMC-1606 through RS485 to collect the power factor of the power grid assessment point and the real-time power of all inverters in real timeThe built-in power adjustment strategy adjusts the inverter to achieve dynamic reactive power compensation through intelligent algorithms, so that the power factor meets the requirements of the power grid assessmentSupport HDMI touch screen to display power station adjustment information in real time, which is convenient for customer operation and maintenance management.