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Isolated power grid stability control system

A technology of stable control and control system, applied in the direction of single-grid parallel feeding arrangement, electrical components, circuit devices, etc., can solve the problems of no approval, inability to connect to the grid, paying high fees, etc., to achieve the effect of load management

Active Publication Date: 2013-06-19
深圳市康必达中创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Many self-owned power plants require stable operation after new construction or expansion, but they cannot be connected to the grid due to lack of approval documents. Due to the supervision of the power department, many self-owned power plants that have been approved to be connected to the grid need to pay high fees to the power department for each kilowatt-hour of electricity

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Embodiment 1

[0024] Turbine-generator control system and excitation system design: 1. First, carry out the overall design of the turbine control system and load monitoring and classification system, so that each unit can maintain coordinated control, and ensure that the power supply and distribution system can operate safely and stably after the grid is isolated. The load actually used, through the interface with DEH, implements the steam turbine adjustment work, realizes the balance of power generation and power consumption, improves the generator speed control system, ensures the rapidity of the generator's primary and secondary frequency regulation actions, and ensures the stability of the system frequency; 2 1. In the case of large changes in power load, each unit cooperates with each other to increase or decrease the load to meet the load needs of the isolated power grid and stabilize the frequency; 3. Improve the excitation system, increase the multiple of strong excitation, and the ma...

Embodiment 2

[0028] Load management and control system and communication network design, in the monitoring center, through the establishment of a global power supply and distribution integrated management automation system, a computer network system with two functional levels covering all subsystems and electrical networks is formed to realize the monitoring of electric energy, etc. The automatic monitoring of energy medium, and then complete the optimal scheduling and control management of energy; the system adopts a reliable industrial network to form a distributed data collection, monitoring, analysis and management system, and the system communicates with the steam turbine through communication or hard wiring to realize the generator set load Control, automatic load distribution among units and implementation of load shedding.

[0029] figure 1 As shown, the power supply and distribution integrated management automation system adopts a dual-machine dual-network structure, and two hot-s...

Embodiment 3

[0035] The stability design of the isolated grid operation condition, in order not to paralyze the entire grid system when the generator fails to trip, the bus-connection section switch between the large grid and the small grid is used as the power grid-connected with the system Exchange point; in order to ensure rapid grid connection and access to the system when the generator fails to decommission, a synchronous tracking isolation transformer is added between the isolated grid of the generator and the large power grid, so that the isolated grid of the generator can be synchronized with the system in real time.

[0036] When the above failure occurs and the bus tie breaker fails to be connected to the grid, it will directly switch to the "load control system" and "low-cycle load shedding" for load stability control; isolated network” status. The revamped speed control system of the generator set, "fast primary frequency regulation circuit and secondary frequency regulation", ...

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Abstract

The invention discloses an isolated power grid stability control system based on a power grid with a small capacity which breaks away from a large power grid. The isolated power grid stability control system is an important quality indicator and reflects a balance state between supply and demand of active power of a power system. Stable frequency is an important aspect of the power system stability. Normal frequency deviation of the power system is allowed to + / - o.2 Hz. Therefore, at the instant that generating capacity is insufficient and an isolated power grid appears, part load is removed timely according to a decreased amplitude value of the isolated power grid frequency. A turbo generator control system and a load monitoring grading system are designed entirely to enable turbo generator units to keep coordinate control, and safe and stable operation of a power supply and distribution system of a power grid is guaranteed. According to the actual use of load, a turbo generator governing valve works through a digital electro-hydraulic control system (DEH) interface, balance between power generation and power consumption is achieved, quickness of primary and secondary frequency modulation of a generator is ensured, and stability of the system frequency is guaranteed.

Description

technical field [0001] The invention relates to the fields of power control such as power generation, power transmission, power transformation, power distribution and power consumption, and in particular to an isolated grid stability control system. Background technique [0002] Isolated grid is the abbreviation of isolated power grid. It generally refers to a small-capacity grid that is separated from the large grid. According to the power construction regulations, a grid with a maximum stand-alone capacity less than 8% of the total capacity of the grid can be called a large grid. At present, the power grids in major regions of my country The capacity ratio of machine-to-grid is less than 8%, which can be regarded as an infinite power grid. In contrast, grids with a capacity ratio of more than 8% are collectively referred to as small grids; small grids that operate in isolation are called isolated grids. [0003] For small grid conditions, there is a problem of load distribu...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J13/00
Inventor 林峰平丁建义鄢军华李晏张孝山刘正方周正龙
Owner 深圳市康必达中创科技有限公司
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