登录查看更多内容

How can control theory improve power system stability?

由人工智能和领英社区提供技术支持

Power system stability is the ability of an electric grid to maintain a balanced operation under normal and abnormal conditions. It is essential for ensuring the reliability and security of electricity supply to consumers. However, power system stability is challenged by various factors, such as increasing demand, renewable energy integration, and cyber-physical threats. How can control theory improve power system stability? Control theory is a branch of engineering and mathematics that deals with the design and analysis of dynamic systems and their feedback mechanisms. In this article, we will explore how control theory can help enhance power system stability by addressing four key aspects: frequency, voltage, angle, and transient stability.

此文章中的业界达人

由社区从 2 条内容中精选。了解更多

Chandan Kumar

Power System Explorer

1 Frequency stability

Frequency stability refers to the ability of a power system to maintain a constant frequency (usually 50 or 60 Hz) under normal and small disturbances, such as load changes or generator outages. Frequency stability is important for avoiding damage to equipment, ensuring power quality, and facilitating power exchange. Control theory can improve frequency stability by designing and implementing frequency control schemes, such as primary, secondary, and tertiary control. These schemes use feedback signals from frequency measurements and power imbalances to adjust the generation output and load demand to restore the frequency balance.

添加您的观点

Chandan Kumar

Power System Explorer
举报内容
Primary control is basically Primary frequency response (PFR) which is provided by available synchronous units on bar through droop control. It is fully deployed within 30 seconds from its activation and remain active till secondary control comes into action (5 min). Governor of running generating units which are mandated to provide PFR monitors the grid frequency and changes the plant output if any change in grid frequency is observed by their controller. The response depends on the droop characteristics of the unit and change in grid frequency. In addition, PFR can be provided by IBR and BESS in form of fast frequency response (FFR). With Drop in inertia due to reduction in Sync gen, IBR and BESS FFR response is of prime importance.

已翻译

赞

2 Voltage stability

Voltage stability refers to the ability of a power system to maintain acceptable voltage levels at all buses under normal and large disturbances, such as line faults or contingencies. Voltage stability is important for avoiding voltage collapse, blackouts, and equipment failures. Control theory can improve voltage stability by designing and implementing voltage control schemes, such as reactive power compensation, voltage regulation, and load shedding. These schemes use feedback signals from voltage measurements and power flow calculations to adjust the reactive power injection and absorption to maintain the voltage profile.

添加您的观点

3 Angle stability

Angle stability refers to the ability of a power system to maintain synchronism among all generators under normal and severe disturbances, such as short circuits or islanding. Angle stability is important for avoiding loss of synchronism, separation, and instability. Control theory can improve angle stability by designing and implementing angle control schemes, such as power system stabilizers, excitation systems, and inter-area oscillation damping. These schemes use feedback signals from rotor angle measurements and speed deviations to adjust the excitation voltage and torque of the generators to dampen the oscillations and enhance the synchronism.

添加您的观点

Chandan Kumar

Power System Explorer
举报内容
Angle is one of the important quantities that determine the various stability and control aspects of the power system. Different types of defined angles provide vital information ranging from the power factor, direction of power flow, stress and stability of power system, generating plant stability etc. In general, power system engineers come across three kinds of angles :Phase Angle, Torque Angle (Load Angle) and Power Angle. Each of these angles has its own role in providing input to power system engineers and operators in controlling and managing the generating units as well as the electrical grid. Better the control over these angles, more secure is power system in terms of angular stability and other defined stabilities.

已翻译

赞

4 Transient stability

Transient stability refers to the ability of a power system to maintain stability under large and sudden disturbances, such as faults, switching, or loss of generation. Transient stability is important for avoiding cascading failures, instability, and system collapse. Control theory can improve transient stability by designing and implementing transient control schemes, such as fault clearing, fast valving, braking resistors, and flexible AC transmission systems. These schemes use feedback signals from fault detection and protection devices to apply corrective actions to limit the fault duration and severity, and to accelerate the post-fault recovery.

添加您的观点

5 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

添加您的观点

Energy Engineering

+ 关注

给文章评分

我们借助人工智能创建了此文章。您认为这篇文章怎么样？

很棒不太好

举报此文章

查看全部

How can control theory improve power system stability?

1

2

3

4

5

1 Frequency stability

2 Voltage stability

3 Angle stability

4 Transient stability

5 Here’s what else to consider

Energy Engineering

给文章评分

感谢您的反馈

更多Energy Engineering相关文章

更多相关阅读内容