Recently, Zhejiang High Resilience Grid Smart Dispatching Platform and Haining Jianshan source-network-load-storage coordinated control system carried out the first joint commissioning test. The first round of tests realized fast charging of energy storage and quickly increased the power of the source-network load-storage coordinated control system by 0.6 MW. In 10 minutes, the stored electric energy can meet the electricity consumption of an ordinary household for one month. In the second round of tests, through the second-level response of 3 MW interruptible loads and the rapid discharge of 1 MW of energy storage, the source-network-load-storage coordinated control system can quickly adjust and reduce the 4 MW load power, which can calmly cope with the summer peak time. Insufficiency problem. This marks the first time that Zhejiang has implemented the source-network-load-storage coordinated control system to participate in the grid's real-time optimized dispatching and closed-loop operation through a highly flexible grid smart dispatch platform, and is a pioneering demonstration of "source-network-load-storage" collaborative interaction.
In supporting the State Grid Zhejiang Electric Power Company to build a diversified and highly resilient grid, NARI Group has undertaken the highly resilient grid smart dispatch platform, grid balancing technical support system, grid transmission capacity improvement system, short-circuit current flexible suppression system, and grid operation efficiency The construction work of the promotion and safety and stability guarantee system and the interruptible load control system of million kilowatts per second.
assists in the construction of "high-load" power grids
In recent years, with economic development and industrial structure adjustment, the development of Zhejiang Power Grid is facing profound changes and needs for transformation. On the power source side, there are 13 types of power generation in Zhejiang, and the proportion of external electricity reaches 35.7%. At the same time, new energy is developing rapidly; on the power grid side, the safety red line is constantly tightened, and the equipment and operation redundancy is large; on the load side, users load resources In a dormant state, the interactive mechanism capabilities have not yet been established; on the energy storage side, the facility configuration is small and difficult to use. To this end, Zhejiang Electric Power pioneered the construction of a diversified and highly resilient grid in the form of the energy Internet. To build a diversified, integrated and highly resilient power grid is to use technologies such as the “Big Cloud Mobile Smart Chain” to empower the power grid, release the power grid potential, enrich the power grid adjustment methods, and greatly improve the efficiency of the power grid while improving the security level of the power grid. Multi-integrated and highly resilient power grids can solve the problems of lack of interaction between grid source and load, safety dependence on redundancy, shrinking balance capacity, and lack of efficiency improvement methods.
Building a load resource pool is an important prerequisite for improving the carrying capacity of the power grid. NARI Group combines the adjustment attributes and schedulable attributes of load resources, and faces the characteristics of hierarchical and partitioned operation of the grid, and carries out modeling and automatic aggregation layer by layer, and then builds a unified adjustable load resource pool as a whole to participate in the power grid for adjustable load resources Peak shaving, frequency modulation, accident backup, partial overload, etc. provide strong support.
Currently, NARI Group has supported Zhejiang Power Grid to achieve real-time control of the load of more than 4000 adjustable charging piles across the province. Provincial electric vehicles have the ability to participate in the load adjustment and reduction of Zhejiang Power Grid; to achieve a coordinated control system for source network load storage and storage Participate in real-time optimized dispatch and closed-loop operation of the power grid; complete batch remote control with Hangzhou Province ground load and AGC coordinated control test in Wenzhou Province. The next step will continue to implement functions such as the coordinated control of resources at the provincial level and second level, and wake up massive load resources from the society to participate in the power grid adjust.
"Online calculation and management of section stability limit for dynamic capacity increase" is another measure to improve the carrying capacity of Zhejiang Power Grid. NARI Group obtains equipment dynamic limits by making full use of the status information of online monitoring devices such as micro-meteorology, wire temperature, sag, etc., under the premise of ensuring the safe operation of the power grid, rolling calculations of the maximum power transmission capacity under multiple time scales of power transmission section of the power grid, Thereby delaying or reducing equipment construction investment and improving grid operation efficiency.
Supporting the construction of "high interaction" power grid
On September 15, the million-kilowatt-second-level interruptible load control system developed by NARI Group for Zhejiang Electric Power passed the functional test organized by Zhejiang Electric Power Control Center and completed the factory acceptance.
The system adopts a hierarchical structure design, deploys the main and sub-stations in independent load control areas, the overall structure is safe and reliable, and supports the hierarchical processing of emergency load control needs at the provincial and municipal levels. The system can perform one-stop full-process monitoring, real-time monitoring of regional, user, and terminal-level data and status, and track and report the execution of scheduling events. At the same time, the system can flexibly configure and optimize the control strategy of the load control terminal according to the actual demand of power grid peak shaving, form a reasonable and efficient user-side terminal control scheme, and achieve precise control of interruptible loads.
Currently, the mega-kilowatt-second interruptible load control system developed by NARI Group has been deployed in Zhejiang Electric Power and 11 municipal companies in Zhejiang Province. The R&D and engineering personnel of NARI Group are working hard, and strive to complete the main and sub-stations by the end of November, and achieve millions ofThe watt-second level can interrupt the load control.
Serving the development of "high-efficiency" power grids
On October 29, the on-line fine calculation of short-circuit current and the auxiliary decision-making system developed by NARI Group was applied at the debugging point in Zhejiang Province. This trial operation effectively solved the problem caused by the incomplete power grid equipment model. Inaccurate short-circuit current assessment, inability to calculate short-circuit current for medium and low-voltage power grids, and long-term use of current-limiting measures such as tripping lines and outages of units have reduced power grid operating efficiency.
On-line fine calculation of short-circuit current and auxiliary decision-making system based on the provincial power grid global perception information, Zhejiang power grid dispatching automation system equipment model and dynamic data to achieve 35 kV ~ 1000 kV full voltage level short-circuit current on-line fine evaluation, there is It helps dispatchers to grasp the short-circuit current operation level of the whole network in real time. The
power grid dynamic operation limit module can fully tap the limit transmission capacity of the existing equipment and realize the dynamic capacity increase of the equipment. At present, NARI Group has basically completed the research and development of the main functions of the dynamic stability limit system. After it is officially launched, it can provide Zhejiang Electric Power with unified management of the dynamic stability limit and static stability limit of the grid, providing strong support for improving the efficiency of the grid.
In addition, NARI Group has also developed the Haining Jianshan source network load-storage coordinated control system based on the D5000 unified platform. This system is aimed at the unified modeling of distributed power, energy storage, flexible loads and related distribution networks, and has data collection and monitoring On the basis of the platform of supporting functions such as control, with the construction idea of “provincial and local coordination, regional autonomy, and terminal interaction”, the multi-link coordinated operation control of the “source network load storage” in the region is carried out, and the “cooling, heating, power” and multi-energy are carried out. Complementary operation control realizes safe, reliable, economical, efficient and green operation of regional power grids.
Author: SHE Yong Lu Yuan Di Qin Hong
Editor: Wang Ping
proofread: Zhuo
