Multi energy complementary system

Multi energy complementary system is an extension of traditional distributed energy applications, which concretizes the concept of integrated integration in the field of energy system engineering, enabling the application of distributed energy to expand from point to surface and from local to system. Specifically, the multi energy complementary distributed energy system refers to a "regional energy internet" system that can contain multiple energy resource inputs, and has multiple output functions and transport forms. It is not a simple superposition of multiple energy sources, but a comprehensive complementary utilization based on different energy levels at the system level, and an overall arrangement for the coordination and conversion of various energy sources to achieve reasonable energy utilization results

Overview

Multi energy complementary systemIt is an extension of traditional distributed energy applications and a concrete manifestation of the integrated concept in the field of energy system engineering, which enables the application of distributed energy to expand from points to surfaces and from local areas to systems. Specifically, the multi energy complementary distributed energy system refers to a 'regional energy internet' system that can contain multiple energy resource inputs and has multiple output functions and transport forms. It is not a simple superposition of multiple energy sources, but a comprehensive and complementary utilization of different energy grades at the system level, and a coordinated arrangement of the coordination and conversion of various energy sources to achieve reasonable energy utilization effects and benefits.

General principle

(1) Progressiveness and forward-looking: the system construction adopts advanced design scheme that conforms to the future development trend.

(2) Security: Adopting a complete security architecture to avoid a security vacuum.

(3) The system should have expandability in terms of system capacity, communication capability, processing capability, etc., which can facilitate product upgrades, replacements, and functional expansion. The system adopts advanced technology, methods, and equipment to provide open standard interfaces for third-party applications. In future upgrades, it can effectively protect existing investments and has a high comprehensive performance price ratio.

(4) The system can operate normally 24 hours a day, 365 days a year, and all equipment has high reliability and excellent performance.

(5) The system has high security and confidentiality, and various forms of illegal intrusion into the system are prevented through graded protection, control of data storage permissions, and network security isolation.

(6) The system administrator is able to maintain and manage the system, and during maintenance and repair, it does not affect the overall business operation of the system. At the same time, all documents of the recording system must be complete, accurate, and consistent, and the accuracy of physical connections must be accurately recorded in the corresponding documents. In addition to accurately recording themselves, various documents must also ensure logical consistency between each other. Facilitating user maintenance after handover.

System Network Structure

The multi energy complementary intelligent scheduling system bundles various power sources such as wind, solar, water, fire, and storage within the power generation base into a virtual power plant, achieving multi energy complementary optimization scheduling and fully utilizing the frequency regulation and peak shaving capabilities of thermal power units and hydropower units. The virtual power plant shares a set of AGC and AVC command values to control the total active and reactive power output of the virtual power plant. The multi energy complementary intelligent scheduling system optimizes scheduling calculations within the virtual power plant based on the AGC and AVC command values from the grid dispatch center. It calculates the target values of active and reactive power output for each station and sends the calculated results as the AGC and AVC command values for each station, which are then distributed to each new energy station or generator set. The system architecture diagram is shown in the following figure:

Main Features

(1) A microgrid is an autonomous system that can achieve self-control, protection, and management. As a complete power system, it relies on its own control and management to achieve power balance control, system operation optimization, fault detection and protection, power quality governance, and other functions.

(2) The proposal of microgrids aims to achieve flexible and efficient application of distributed power sources, and solve the problem of grid connection of a large number and diverse forms of distributed power sources. The development and extension of microgrids can fully promote the large-scale integration of distributed power sources and renewable energy, achieve highly reliable supply of multiple forms of energy to loads, and is an effective way to achieve an active distribution network, enabling the transition from traditional grids to smart grids.

(3) The power sources in microgrids are mostly distributed power sources with small capacities, including small units with power electronic interfaces, including micro gas turbines, fuel cells, photovoltaic cells, small wind turbines, as well as energy storage devices such as supercapacitors, flywheels, and batteries. They are connected to the user side and have the characteristics of low cost, low voltage, and low pollution.

(4) The system has cross platform running characteristics and can run on Windows, Linux, and domestic operating system platforms.

Feature Introduction

The multi energy complementary intelligent scheduling system independently optimizes and schedules all power generation resources within the virtual power plant, ensuring the voltage safety (AVC) of the virtual power plant, and quickly, economically, safely, and accurately performs active power optimization scheduling (AGC) to meet the assessment requirements of various regions.

Fully utilize the frequency regulation and peak shaving capabilities of hydropower, thermal power, and energy storage. By optimizing the organization and configuration of conventional energy sources such as wind energy, solar energy and thermal power to form an energy Internet and virtual power station operation mode with the theme of multi energy complementation, learning from each other's strengths can not only improve the stability of power output, but also improve the power system's ability to absorb intermittent renewable energy sources such as wind power and photovoltaic.

summary

Multi energy complementary systems have high energy utilization efficiency and system stability. In addition to advanced control technology, the economic and stable operation of multi energy complementary systems also relies on reasonable energy management and integrated control at the system level. The energy optimization management of multi energy complementary systems themselves and distribution systems containing multi energy complementarity can effectively improve energy utilization efficiency and the economic efficiency of system operation.