?關(guān)于外部輸入位號的仿真句狼，當(dāng)前（PCTP 2009 Build 1）版本的一個重要限制是值中缺少原始的“存儲器”灭返。例如晚吞，如果已經(jīng)開發(fā)了用于檢查外部輸入位號覆蓋功能的計算劫侧，則在激活位號之后的仿真中铅辞，仿真器將永遠(yuǎn)不會恢復(fù)到原始值厌漂。
?由于實現(xiàn)方式不同，離線仿真（PCTP）行為與在線EXASMOC嵌入行為是不同的斟珊。當(dāng)處理遞歸計算時苇倡，經(jīng)常會遇到這個問題。例如囤踩，令[A] = [A] +1旨椒，并假設(shè)[A]的初始值= 10。則在每個內(nèi)核執(zhí)行時堵漱，離線仿真會增加[A]的值综慎，即11,12,13 ...，然而勤庐，在線EXASMOC控制器將保持[A]的值恒定示惊，即11,11,11好港，...
?在方案構(gòu)建過程中必須指定許多重要的可在線修改的參數(shù)。否則控制器構(gòu)建時將使用“默認(rèn)”值米罚。這些參數(shù)為：
? CV優(yōu)先級
? CV設(shè)定點跟蹤濾波器
? DV濾波器時間常數(shù)
? POV脈沖因子
?從PCTP 2010 Build 1版本開始钧汹，用戶可以為白噪聲指定隨機(jī)數(shù)生成器種子。種子值可以是零或任何正數(shù)录择。默認(rèn)種子值為0拔莱，其與先前版本中的行為一樣：當(dāng)每個仿真運(yùn)行時種子將在內(nèi)部改變，由一個仿真跳至另一個仿真時將生成不同的噪聲序列糊肠。如果用戶指定了一個非零值的種子辨宠，則除非用戶更改種子，否則在運(yùn)行時噪聲序列是相同的（可重復(fù)的）货裹。此功能對于比較不同整定參數(shù)時嗤形，控制器對相同噪聲干擾響應(yīng)性能非常有用。
?注意：即使噪聲種子參數(shù)在通用選項卡中的每個干擾和子控制器選項卡中的MV出現(xiàn)弧圆，也不能為單個干擾或MV指定噪聲種子赋兵。改變?nèi)魏谓o定仿真方案的噪聲種子參數(shù)將影響干擾和MVs的所有噪聲干擾。如果用戶要求從一個運(yùn)行轉(zhuǎn)到另一個運(yùn)行時噪聲序列自動改變搔预，則用戶必須確保所有干擾和MVs的噪聲種子參數(shù)值被設(shè)置為零（0）霹期。
原文：
? An important limitation of the current (PCTP 2009 Build 1) release with regards to the simulation of external input tags is the lack of original “memory” in the values. For example, if a calculation has been developed to check the override function of an external input tag, in simulation once the tag has been activated, the simulator will never revert back to the original value.
? Due to different implementations, the offline simulation (PCTP) behavior is NOT identical to the online EXASMOC embedding behavior. The problem is mostly observed when dealing with recursive calculations. For example, let [A]=[A]+1 and assume the initial value of [A] =10. The offline simulation increases the value of [A] at each kernel execution, i.e. 11, 12, 13, ..., however, the online EXASMOC controller keeps the value of [A] constant, i.e. 11, 11, 11, ...
?There are a number of important online modifiable parameters that MUST be specified during the scenario build process. Otherwise ‘default’ values are used in the controller build. The parameters are:
? CV priorities
? CV setpoint tracking filters
? DV filter time constants
? POV impulse factors
? ?Starting with the PCTP 2010 Build 1 release, users can specify the seed of the random number generator for the white noise. The seed value can be zero or any positive number. The default seed value is 0, which has the same behavior as in previous releases: the seed is changed internally for each simulation run, generating different noise sequences from simulation run to simulation run. If users specify a non-zero seed, the noise sequence is the same (repeatable) from run to run until users change the seed. This functionality is very useful to compare controller performance with different tunings reacting to the same noise disturbance.
?NOTE: Even though the Noise Seed parameter appears with every disturbance in the general tab and MV in the sub-controller tabs one cannot specify noise seeds for individual disturbances or MVs. Changing any Noise Seed parameter for the given Simulation Scenario will affect all noise disturbances for the disturbances and MVs. If the user requires the noise sequence to automatically change from run to run then the user must ensure that the Noise Seed parameter values for ALL the disturbances and MVs are set to zero (0).
2010.10.16
