Sunday, July 28, 2024

Ten years.

For the past decade, Australia has been my home, a land of boundless opportunities.

About 12 years ago, I ventured beyond the Middle East in search of new horizons. The array of options was both exhilarating and daunting. Armed with my experience as a Power Plant Operator and comprehensive training from Japanese Engineers, I felt poised to make my mark in a new setting.

At that time, I also contemplated starting a business in the Philippines to be closer to my ailing father. But then I met my ex-wife, who was determined to relocate to Australia. She was eager to escape the derision of her relatives who had criticized her for not passing job interviews abroad and failing to obtain her Occupational Therapist certification.

Enter me: compelled to play the hero and help my ex-wife realize her dream of moving to Australia.

The process was initially straightforward – pass the IELTS exam and compile a Competency Demonstration Report (CDR) to validate my engineering credentials. A score of 60 was sufficient for migration. However, for her to join me as a secondary sponsor, we had to marry, which was complicated by the fact that she was still married. I covered the costs of her annulment. Though the expenses for visas, annulment, our wedding, her child’s tuition, and my father’s dialysis and medicines, plus our ancestral home’s renovation were substantial, I managed them with my sister’s help.

The experience proved to be financially exhausting and emotionally draining.

Despite this, I remained committed. I never anticipated that my ex-wife’s attitude would shift once our Australian visa was approved. Shortly after our marriage, she became pregnant, and with our move to Australia scheduled around her due date, we face a difficult choice. She was unwilling to stay behind until after the birth. She insisted we move immediately to Australia, but I couldn’t leave my father, especially given his dialysis needs. I needed to find a caregiver for him before we could proceed.

It was heart-wrenching when she proposed leaving my father in an aged care facility so we could move right away. Her selfishness in pursuing her Australian dream was disheartening. Torn between my duty to my father and my commitment to my ex-wife, I chouse to prioritize my father’s well-being.

One evening, I shared my decision with father, expressing my intent to put our migration plans on hold and stay with him until his health improved. To my astonishment, he urged me to find a caregiver for him and continue with our plans, stressing the importance of our future. His selflessness and insight left me profoundly moved.

Following this, my relationship with my ex-wife unravelled rapidly. She seemed to pit me against my father, making me feel used and manipulated, revealing that her primary interest was securing an Australian visa.

Tragically, she suffered a miscarriage. Despite her obstetrician’s advice to rest due to the baby’s fragile state, she continued working against my wishes. She claimed she needed 30 thousand pesos for her child’s tuition, even though I believed I had already covered these expenses.

Respect in our relationship dissolved, and I felt like a mere bystander, excluded from her life and deprived of the intimacy that should have been ours.

Eventually, lies and deceit emerged.

I discovered she had an affair and planned to meet this person in Australia, then file for divorce. This was the breaking point for me, and I confronted her. Her deceit continued, revealing that her plans were merely a scheme to extract money from her lover.

I considered withdrawing their visa, as the primary sponsor, I had the right to do so. Yet, I chose not to act out of spite. I knew that migrating to Australia would offer a brighter future for her child and for her. To this day, I have no regrets about that decision.

A decade of bliss in the land down under.

To God be the Glory!

 

---- summary of a book I recently read.

Friday, July 26, 2024

Open Cycle Gas Turbine

The open cycle gas turbine operates by drawing fresh atmospheric air at ambient conditions into a compressor, which may be a centrifugal or axial flow type. The compressor increases the temperature and pressure of the air to levels specified by the original equipment manufacturer (OEM). This compressed air, now at a higher pressure, is directed into a combustion chamber where fuel is combusted at essentially constant pressure. The resulting high-pressure hot gases drive the turbine, generating power through the rotation of the turbine shaft, which can be utilized for various applications such as electricity generation and as prime movers for industrial equipment. The exhaust gases exiting the turbine are released into the atmosphere, classifying the cycle as an open system since these gases are not recirculated.

 

The open cycle gas turbine is a versatile and rapid-response power unit that can be brought online and taken offline quickly making it a primary source of peak power in electrical grids worldwide. However, these units are generally more expensive and less efficient compared to base load power plants like combined cycle and thermal power plants.

Brayton Cycle

  • 1.     Isentropic compression: air is compressed to high pressure and temperature via an isentropic process that is adiabatic and reversible.
  • 2.       Constant pressure heat addition (Isobaric heat addition): high-pressure air is fed into a combustion chamber where fuel is added and ignited.
  • 3.       Isentropic expansion: high-temperature gases from the combustion chamber expand in the turbine in an isentropic process, producing mechanical work.
  • 4.       Constant pressure heat rejection (Isobaric heat rejection): the exhaust gases are expelled into the atmosphere.






 

 

Monday, July 22, 2024

Cascade Control System

Cascade control is a sophisticated multi-loop control structure commonly utilized in industrial applications, facilitating the implementation of advanced controllers. This method integrates two feedback loops, where the output of the primary controller sets the set-point for the secondary controller (master and slave).

Essentially, the feedback loop of one controller is nested within the other, enabling an enhanced response to disturbances.


The accompanying figure demonstrates the application of cascade control in regulating the liquid level in a container (Steam drum level). In a single-loop control system, the level sensor provides feedback, generating an error signal for the controller to adjust the fluid inflow rate (Feedwater control valve). Rapid changes in flow can lead to significant delays before the liquid level changes sufficiently to prompt a correction. In contrast, a cascade control system utilizes the level sensor’s feedback for the outer loop controller, which then adjusts the set-point for the secondary controller responsible for regulating the liquid flow rate (feedwater).

This arrangement allows the flow level loop to respond swiftly to allow disturbances, significantly minimizing level fluctuations compared to a single-loop control system.

One of the most common applications of cascade control is in managing the steam drum level of a boiler vs the feedwater control valve.

Friday, July 19, 2024

Power System Stabilizer (PSS)

Power system stabilizer (PSS) is a sophisticated control system installed on a generation unit that monitors variables such as current, voltage, and shaft speed. While excitation systems with high gain and rapid response times enhance transient stability, they can also diminish small signal stability. PSS control plays a crucial role by damping generator rotor angle oscillations across a wide range of frequencies in the power system.

When necessary, the PSS sends precise control signals to the voltage regulator to suppress system oscillations, ensuring the frequency remains within acceptable tolerances.

Rapid, minor fluctuations in frequency, known as frequency oscillations, occur in bulk electric systems due to small variations in load. These oscillations must be damped to prevent them from escalating and pushing frequencies beyond system tolerances, which could lead to system shutdowns and extensive outages. During these small oscillations, the generator’s rotational speed varies due to frequency changes. However, the turbine control, which manages speed by adjusting fuel input, is not always fast enough to respond to such oscillations.

Given the interconnected nature of multiple generators in a bulk electric system, each generator may respond differently, potentially causing them to fall out of sync. Therefore, it is vital to address these oscillations promptly. A PSS achieves this by sending control signals to the generator voltage regulator upon detecting oscillations, quickly adjusting generator operation to counteract the frequency oscillations.

Difference between AVR and PSS

Automatic Voltage Regulator (AVR) controls the generator’s terminal voltage to a specified setpoint, while the PSS modulates the AVR input to mitigate both low-frequency and local-mode power oscillations. The AVR regulates terminal voltage by controlling the current supplied to the generator field winding through the exciter. The PSS, integrated with the AVR, dampens low-frequency oscillations in the power system by providing a supplementary signal to the excitation system.

Friday, July 12, 2024

Synergy Interview

 

1.     How long have you worked at Synergy?

    ·       Hired September 2021, working with awesomeness for almost 3 years now.

2.     Where do you live?

    ·       Living in Piara Waters since 2022.

3.     Do you have any pets?

    ·       I have a female cream Golden Retriever I simply calling her Sabrina on a good day and a merchant of death when she’s annoying the neighbours with her barking and destroying my furniture.

4.     What’s your favourite thing to do on the weekend?

    ·       Aside from Netflix and chill, I walk my dog and play drums to annoy the neighbours. 😃

5.     If you could have dinner with someone famous (could be a real person/fictional person/deceased person) who would it be?

        ·       My Father and my Mamay (Aunt)
6.     Where were you born?

        ·       Manila, Philippines
7.     When you were a child, what did you want to be when you grew up?

        ·       I wanted to be a pilot; wanted to be part of Voltron, defender of the universe. (Back then I thought there’s really a Voltron Team)   
                ·       Ended up piloting Power Plants, fair enough.
8.     What is your favourite food?

        ·       Kare Kare, a Filipino dish (A variant of beef curry)

9.     If you could have any superpower, what would it be?

        ·       Time manipulation 😃

10.  What is an interesting fact about you that nobody knows?

        ·       I’m still maintaining and writing a blog; a sort of stress reliever, I guess. Feel free to check it out. 😃
                    ·       deoselosa experience

11.  What’s your favourite season of the year?

        ·       Spring to summer

12.  What high school did you go to?

        ·       Sta. Catalina College back in the Philippines

13.  Are you a morning person or a night owl?

        ·       A night owl

14.  Who/What is in your BIG 5?

        ·       My Father
        ·       My Auntie, who raised me and taught me almost everything I need to know
        ·       Coffee
        ·       My Sabrina
        ·       Learning new things

15.  What are you currently watching on TV/or reading?

        ·       Rick and Morty on Netflix
        ·       Happy sexy Millionaire by Steven Bartlett
 

A Son Never Forgets

Before moving to Australia in 2014, I spent a decade working in the Middle East, from 2004 to 2014. I held the position of Lead Power Contro...