Integrated Power Control Devices

The devices can be applied to electrochemical energy storage power stations, new energy wind and PV (distribution and storage) power stations, new energy panoramic monitoring, overseas new energy power stations.

Product Overview

Power grids with a high proportion of new energy have challenges of multi-dimensional control, and problems such as high redundancy and low reliability of equipment, high investment, and a large amount of inspection and maintenance. Promoting the integrated power control system in new energy stations is an important measure to ensure the safe and stable operation of large power grids. It is of great significance to build a new energy control system with “clear authority and responsibilities of frequency regulation, and coordination among various types of units” for promoting the sustainable and healthy development of new energy and realizing the strategic goal of “carbon dioxide peaking and carbon neutrality".

The integrated power control device of CYG ET has the functions of data acquisition, protocol conversion, data upload, etc. It can realize coordinated control of station-level energy storage systems, including output distribution and coordinated control of station-level PCSs, and supports the protocols IEC61850 good and Modbus. The energy storage coordinated controller supports dual-machine and dual-network configuration and has the following functions: inertia support, damping control, emergency control, primary frequency modulation, dynamic voltage regulation, secondary frequency modulation, auxiliary transaction, sequence control, concurrent control, automatic SOC maintenance, anomaly detection and adjustment, etc.


Product advantages

  • Redundancy elimination and coupling reduction

    Power system: The redundancy of multiple types of power control equipment can be eliminated. A central power control system is configured for panoramic monitoring through the power control acquisition terminal. A simplified version of both the monitoring system and EMS can be achieved by using a single monitoring system, without the need for AGVC function.
    Measurement and control decoupling: A special GOOSE control network is built to decouple from the station control layer. A dedicated integrated acquisition terminal is connected to the inverter controller and converter controller to collect and control the information of containerised transformers, output GOOSE data to control host unit and MMS to station control layer.

  • Dedicated communication is established for fast control

    Device architecture: Distributed architecture of a power control host unit + an acquisition terminal. The control host employs GOOSE communication for fast control, and leverages the station control layer network for protocol forwarding and convenient scalability. The acquisition terminal supports expansion in a tree-like structure.
    Network architecture: A special GOOSE control network is built to respond to control commands quickly.

  • Multiple systems coordinate for power control

    Extended systems: Multiple systems are connected, such as the wind and PV power forecasting system, the auxiliary control system, and the auxiliary service system.
    Control functions: With stability control devices connected, the product enables emergency power control, and realizes the function of adjustment instead of cut-off. The product has the functions of inertial response, primary frequency modulation and voltage regulation, and secondary frequency modulation and voltage regulation. It also provides auxiliary power trading services. It can be connected to reactive power equipment such as SVG and SVC, and support AVC voltage regulation.

  • The system exhibits versatility and can be adapted to various scenarios with ease.

    Scope of application: The product can be applied to energy storage power stations, PV power stations, wind farms, power stations integrating wind power, PV and storage. It is equivalent to a PPC (power plant controller) overseas.
    Safety and reliability: The dual machines are standby for each other. Built on an embedded system architecture, the product incorporates electromagnetic compatibility and advanced protection techniques. Additionally, it is designed to be decoupled from other management functions, thereby enhancing its security.
    Panoramic monitoring: A special acquisition terminal is connected to the inverter and combiner box to acquire information. It is also used as a measuring and control device of the containerised transformer, and it sends data to the background through the MMS network to realize panoramic monitoring.

Technical parameters

No.

Performance indexes:

1

Response time: The response time of dynamic reactive power control is less than 30ms, the response time of interaction among power supply, grid and loads is less than 60ms, and the response time of primary frequency modulation is less than 150ms.

2

The products supports IEC61850, and 128 sets of PCSs can be connected through GOOSE and Modbus.

3

The product enables emergency control of power supply, power grids, loads and energy storage, as well as the stability control system. It can receive action signals from terminals of interaction among power supply, power grid, loads and energy storage, control PCSs to discharge at maximum power, and receive bidirectional adjustment commands from the stability control system, with response delay less than 10ms.

4

The minimum response time from coordinating energy storage to reaching 90% of the PCS output is less than 30ms.

5

The product integrates the functions of primary frequency modulation, secondary frequency modulation, and auxiliary transaction, enabling the coordinated power control of the station as a whole. It works with the auxiliary trading system of EMS, allowing for real-time tracking and analysis of generated electricity power and electricity prices, as well as the development and execution of high-yield electricity spot trading strategies.

6

The product enables sequence control of generation units and concurrent control, and supports black start.

7

The product has the automatic SOC maintenance function. It follows the control strategy of slow charging and slow discharging, issues active power adjustment commands to PCSs to carry out charging and discharging for maintenance purpose, and adjusts SOC to a reasonable range.

8

The product includes an malfunction monitoring and adjustment triggering function. In case of malfunctions, the coordinating control system is automatically triggered to perform a new round of allocation adjustment. Furthermore, the output of the abnormal device is forcibly limited to zero or switched to the standby mode, to prevent any potential damage to the battery packs that may result from malfunctions of energy storage devices.


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