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发电机组自动控制系统的同步发布

来源:http://www.huannengpower.com   发布于:2019-05-31

统频率的变化是由于发电机的负荷功率与原动机输入功率之间失去均衡所致.因而调频与有功功率调理是不可分开的。电力系统负荷是不时变化的,而原动机输人功率的改动则较迟缓,因而系统中频率的动摇是难免的。负荷的变动状况能够分红几种不同的重量:种是频率较高的随机重量,其变化周期普通小于10s,是靠单元机组调速系统来自动调速完成的,即一次调频,一次调频的特性是由汽轮发电机组自身的调理系统直接调理,因此其响应速度快;第二种为脉动重量,变化幅度较大,变化周期在10 s~3 min之间;第三种为变化很迟缓的持续重量。后两种要经过改动汽轮发电机组的同步器来完成,即经过平移高速系统的调理静态特性,从而改动汽轮发电机的出力来到达调频的目的,称为二次调频。当二次调频由电厂运转人员就地设定时,称为就地手动控制。

The change of the system frequency is caused by the unbalance between the load power of the generator and the input power of the motor. Therefore, frequency modulation and active power regulation are inseparable. The load of power system varies from time to time, while the change of the power of the prime mover is slow, so the frequency fluctuation in the system is inevitable. Load changes can be divided into several different weights: the first is the random weight with higher frequency, whose change period is usually less than 10 seconds, which is accomplished by automatic speed regulation of the unit unit speed control system, namely primary frequency regulation, whose characteristics are directly regulated by the regulation system of the turbogenerator unit itself, so its response speed is fast; the second is the fluctuating weight. The change period is between 10 s and 3 min, and the third is the continuous weight which changes slowly. The latter two are accomplished by altering the synchronizer of the turbogenerator unit, that is, by adjusting the static characteristics of the translation high-speed system, the output of the turbogenerator is changed to achieve the purpose of frequency modulation, which is called secondary frequency modulation. When secondary frequency modulation is set locally by power plant operators, it is called in-situ manual control.

电力系统频率的变化,对消费率以及发电厂间的负荷分配都有直接的影响。例如频率变化时,使发电机组和厂用电辅机等设备偏离额定工况,因此它们的效率降低,电厂在不经济的情况下运转,还影响整个电网的经济运转。频率过低时,还会危及全系统的平安运转。

The change of power system frequency has a direct impact on consumption rate and load distribution among power plants. For example, when the frequency changes, the generator set and auxiliary equipment deviate from the rated operating conditions, so their efficiency decreases. Power plants operate under uneconomic conditions, but also affect the economic operation of the entire power grid. When the frequency is too low, it will endanger the safe operation of the whole system.

所以,电力系统运转中的主要任务之一,就是对频率停止监视和控制。当系统机组输入功率与负荷功率失去均衡而使频率偏离额定值时,控制系统必需调理机组的出力,以保证电力系统频率的偏移在允许范围之内(普通允许偏向不得超越±0.2Hz)。

QQ截图20171025151947.jpg

Therefore, one of the main tasks of power system operation is to stop monitoring and controlling the frequency. When the input power and load power of the system unit lose balance and the frequency deviates from the rated value, the control system must adjust the output of the unit to ensure that the frequency deviation of the power system is within the allowable range (the normal allowable deviation should not exceed (+0.2Hz).

有功功率和频率的调整以及调整的幅度和速度都是经过调整汽轮机的进气量来完成的。

The adjustment of active power and frequency as well as the magnitude and speed of adjustment are accomplished by adjusting the intake of steam turbine.

当用一台或几台机组来调理频率时还会惹起机组间负荷分配的改动.这就触及电力系统经济运转问题。因而,频率的调理与电力系统负荷的经济分配有亲密的关系。在调整系统频率时,请求维持系统频率在规则范围内,此外,还要力图使系统负荷在发电机组之间完成经济分配。

When one or more units are used to adjust the frequency, the load distribution among the units will be changed, which will affect the economic operation of the power system. Therefore, frequency regulation is closely related to the economic distribution of power system load. When adjusting the system frequency, it is requested that the system frequency be maintained within the regular range. In addition, the system load should be allocated economically among generators.

完成电力系统频率和有功功率自动控制的的系统称为自动发电控制( Automatic Gen-eration Control,AGC)。自动发电控制系统主要由电网调度中心的能量管理系统(EMS)、电厂端的远方终端(RTU)和分散控制系统的谐和控制系统通道三局部组成。完成自动发电控制系统闭环自动控制必需满足以下根本请求:

Automatic Gen-eration Control (AGC) is a system that accomplishes automatic control of power system frequency and active power. The automatic generation control system is mainly composed of three parts: energy management system (EMS) of power grid dispatching center, remote terminal (RTU) of power plant and harmonic control system channel of decentralized control system. To complete the closed-loop automatic control of the automatic generation control system, the following basic requirements must be met:

(1)电厂机组的热工自动控制系统必需在自动方式运转,且谐和控制系统必需在“谐和控制”方式。

(1) The thermodynamic automatic control system of power plant units must operate in an automatic mode, and the harmonic control system must operate in a "harmonic control" mode.

(2)电网调度中心的能量管理系统、微波通道、,电厂端的远方终端RTU必需都在正常工作状态,并能从电网调度中心的能量管理系统的终端CRT上直接改动机、炉谐和控制系统中的调度负荷指令。机、炉谐和控制系统能直接纳到从能量管理系统下发的请求执行自动发电控制的“恳求”和“解除”信号、“调度负荷指令”的模仿量信号(规范接口为4~20mA DC),能量管理系统能接纳到机组谐和控制系统的反应信号、谐和控制方式信号和AGC已投入信号。

(2) The energy management system, microwave channel and RTU of power dispatching center must be in normal working state, and the dispatching load instructions of motor, Furnace Harmonic and control system can be changed directly from the terminal CRT of power dispatching center's energy management system. Machine and furnace harmonic control system can directly receive the "request" and "release" signals of automatic generation control and the analog signals of "dispatch load instructions" (the standard interface is 4-20 mA DC) from the energy management system. Energy management system can accept the response signals, harmonic control mode signals and AGC input signals of the unit harmonic control system.

(3)能量管理系统下达的“调度负荷指令”信号与电厂机组实践出力的绝对偏向必需控制在允许范围内。

(3) The absolute bias between the "dispatching load instruction" signal issued by the energy management system and the practical output of the power plant units must be controlled within the allowable range.

(4)机组在谐和控制方式下运转,负荷由运转人员设定称为就地控制;承受调度负荷指令,直接由电网调度中心控制称为远方控制。就地控制和远方控制之间互相切换是双向无扰动的。在就地控制时,调度负荷指令自动跟踪机组实发功率;在远方控制时,谐和控制系统的手动负荷设定器的输出负荷指令自动跟踪调度负荷指令。

(4) Units operate in a harmonic control mode, and the load is set by the operator as in-situ control, while the load is directly controlled by the power grid dispatching center as remote control under dispatching instructions. The switching between local control and remote control is bidirectional and undisturbed. In the local control, the dispatching load instruction automatically tracks the real power of the unit; in the remote control, the output load instruction of the manual load setter of the harmonic control system automatically tracks the dispatching load instruction.

有了焦化发电机组上面的小总结,希望对广大客户有所帮助,如果有什么不理解的或者寻求帮助的请点击我们的官方网站:http://www.huannengpower.com  或者来电咨询,我们会尽全力为您解决

With the summary above the coking power unit, I hope it will be helpful to our customers. If you don't understand or ask for help, please click on our official website: http://www.huannengpower.com or call for consultation. We will try our best to solve it for you.


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