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75-76 Electrical secondary section

Author: Source: Datetime: 2016-12-28 17:18:46
4.1.6 Electrical secondary section
PV power station project adopts integrated centralized control mode to realize telemetry, remote view, remote control, remote communication and remote adjustment of all electric equipments in the centralized control room of power station.

4.1.6.1 Integrated automation systems
A set of integrated automation system is set up in the electrical comprehensive building of the photovoltaic power station. The system includes a computer monitoring system and has a telecontrol function. According to the requirements of dispatching operation, the real-time data and information collected by the power station can be transmitted to the superior dispatching center, which can realize fewer people and unattended, and can analyze and print various reports.
PV power plant through the boost to 10kV and regional public power grid. In the 10kV line and grid side of the establishment of energy metering device, through the special voltage transformer and current transformer secondary side connected to the multi-function watt-hour meter, through a special multi-function watt-hour meter measurement of photovoltaic power generation capacity, Voltage, active power, reactive power and power factor meter to monitor system operating parameters. Metering With a special multi-function watt-hour meter with communication capabilities, real-time data can be uploaded to the power station integrated automation system.Power station line side of the signal access to the public power grid dispatching automation system.
It's needed to configure the communication management machine, the main screen installed in the control room, collecting the inverter, 10KV power distribution devices, step-up transformer operating data. The integrated automation system communicates with the electrical equipment in the station through the communication manager. Acquisition, analysis of the data uploaded by the subsystems, while achieving the remote control of the subsystems.
The integrated automation system sends all important information to the monitoring background of the control room. It is convenient for the attendant to monitor and manage each inverter and PV array, and display the parameters such as operation, fault type and energy accumulation on the LCD. The project company can also use the system to achieve the remote control of photovoltaic power station, telemetry and so on.

4.1.6.2 Integrated protection
The main electrical equipment in the PV power station is protected by microcomputer to meet the requirement of information transmission. Component protection in accordance with the "relay protection and safety automation technology" (GB 14285-1993) configuration.
Transformer set high temperature alarm and over-temperature trip protection, after the action of high and low side switch. The thermostat has a communication interface for uploading information.
10kV high-voltage switchgear installed on the monitoring and control devices. Set up over-current protection, zero sequence over-current protection, directional protection, monitoring and control devices to communicate all the information uploaded to the integrated automation system.
The low-voltage switchgear is equipped with a frame circuit breaker with four-stage protection, and a communication module is configured to communicate all the information to the integrated automation system by means of communication.
Inverter with reverse polarity protection, short circuit protection, islanding protection, overheating protection, overload protection, grounding protection, automatic device from the system when abnormal.
10kV grid connection line in the corresponding line configuration of computer current protection device, the specific configuration should be in the construction design by access system design and approval requirements of the file configuration.

4.1.6.3 Station DC system
In order to supply power to the control, measurement, signal, relay protection, automatic devices such as control load and unit AC power supply and other uninterruptible power supply to provide DC power, set 220V DC system.
The DC system adopts power and control combined power supply method. A set of 220V VRLA battery group should be installed in the PV power station, and two sets of high frequency switching power supply charging devices and computer DC insulation monitoring devices are set for the storage battery. 220V battery Capacity can be determined, or 100A x h.

4.1.6.4 Uninterruptible power supply system
In order to ensure the reliability of PV power station monitoring system and telecontrol equipment power supply, a set of AC uninterruptible power supply (UPS) is set up in the project of PV power station with the capacity of 5kV * A. The DC power supply from the DC system, the AC power supply from the station to provide.

4.1.6.5 station communication

Municipal communications access in the photovoltaic power plant complex, the initial consideration of access to a number of telephone network, the use of integrated wiring system.


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