Merge pull request #32 from ps-wiki/misc

Regular update

Author: jinningwang

_wiki/adequacy.md

@@ -4,21 +4,29 @@ description: The ability to supply the demand and energy requirements of the end
 tags:
   - reliability
   - nerc
-related: []
+related:
+  - reliability
 authors:
   - name: Jinning Wang
     url: https://jinningwang.github.io
-version: 1.0.0
+version: 1.0.1
 date: 2025-03-15
-lastmod: 2025-11-29
-generated: 2025-12-02
+lastmod: 2026-01-18
+generated: 2026-01-18
 ---
 
 ### Definition by NERC
 
-Source: <d-cite key="nerc2013terminology"></d-cite>
+Source: <d-cite key="nerc2024glossary"></d-cite>
+
+> The ability of the electric system to supply the aggregate electrical demand and energy requirements of the end-use customers at all times, taking into account scheduled and reasonably expected unscheduled outages of system elements.
+
+<!-- prettier-ignore-start -->
+
+> The previous reference <d-cite key="nerc2013terminology"></d-cite> is no longer available.
+{: .block-danger }
 
-> The ability of the electricity system to supply the aggregate electrical demand and energy requirements of the end-use customers at all times, taking into account scheduled and reasonably expected unscheduled outages of system elements.
+<!-- prettier-ignore-end -->
 
 ### Definition in a European Union Regulation
 

_wiki/cascading.md

@@ -12,7 +12,7 @@ authors:
 version: 1.0.0
 date: 2025-03-15
 lastmod: 2025-06-20
-generated: 2025-12-02
+generated: 2026-01-18
 ---
 
 ### Definition by NERC
@@ -24,6 +24,6 @@ Source: <d-cite key="nerc2024glossary"></d-cite>
 <!-- prettier-ignore-start -->
 
 > This version is approved by FERC on 1/21/2016. Another version of the term "Cascading" was approved by FERC on 3/16/2007 and became inactive on 6/30/2016. The term "Cascading Outages" was remanded by FERC on 12/27/2007.
-> {: .block-tip }
+{: .block-tip }
 
 <!-- prettier-ignore-end -->

_wiki/dynamic-stability.md

@@ -14,13 +14,15 @@ related:
   - frequency-stability
   - voltage-stability
   - rotor-angle-stability
+  - small-signal-stability
+  - participation-factor
 authors:
   - name: Jinning Wang
     url: https://jinningwang.github.io
-version: 1.0.1
+version: 1.0.2
 date: 2025-12-02
-lastmod: 2025-12-03
-generated: 2025-12-03
+lastmod: 2026-01-18
+generated: 2026-01-18
 ---
 
 ### Definition by PJM

_wiki/frequency-stability.md

@@ -8,6 +8,7 @@ tags:
   - article
   - european-union
   - europe
+  - China
 related:
   - stability
   - fast-frequency-response
@@ -20,10 +21,10 @@ related:
 authors:
   - name: Jinning Wang
     url: https://jinningwang.github.io
-version: 1.0.1
+version: 1.0.2
 date: 2025-03-15
-lastmod: 2025-11-28
-generated: 2025-12-02
+lastmod: 2026-01-18
+generated: 2026-01-18
 ---
 
 ### Definition in an Article by a Task Force
@@ -37,3 +38,13 @@ Source: <d-cite key="kundur2004stability"></d-cite>
 Source: <d-cite key="eu2017guideline"></d-cite> p6
 
 > 'frequency stability' means the ability of the transmission system to maintain frequency stable in the N-situation and after being subjected to a disturbance;
+
+### Definition in China grid operation code
+
+Source: <d-cite key="gbt2022"></d-cite> p8
+
+> 频率稳定：电力系统受到扰动后，系统频率能够保持或恢复到允许的范围内，不发生频率振荡或崩溃的能力。
+
+Translation:
+
+Frequency Stability: The ability of a power system to maintain or restore system frequency within an allowable range after being subjected to a disturbance, without the occurrence of frequency oscillation or collapse.

_wiki/oscillation.md

@@ -4,13 +4,16 @@ description: A repetitive motion that can be either undamped, positively damped,
 tags:
   - event
   - oscillation
-related: []
+related:
+  - resonance-stability
+  - subsynchronous-resonance
+  - subsynchronous-oscillation
 authors:
   - name: Jinning Wang
     url: https://jinningwang.github.io
-version: 1.0.0
+version: 1.0.1
 date: 2025-03-15
-lastmod: 2025-06-18
+lastmod: 2026-01-18
 generated: 2025-12-02
 ---
 
@@ -27,3 +30,8 @@ Source: <d-cite key="powerworld2020oscillations"></d-cite>
 > - Inter-area oscillations: From 0.15 to 1 Hz
 > - Slower dynamics: Such as AGC, less than 0.15 Hz
 > - Subsynchronous resonance: 10 to 50 Hz (less than synchronous)
+
+<!-- prettier-ignore-start -->
+In the context of power systems, Oscillation is an umbrella term that includes resonance.
+{: .block-tip }
+<!-- prettier-ignore-end -->

_wiki/participation-factors.md

@@ -4,14 +4,15 @@ description: One definition is about dispath and another is about small-signal s
 tags:
   - sensitivity
   - book
-related: []
+related:
+  - small-signal-stability
 authors:
   - name: Jinning Wang
     url: https://jinningwang.github.io
-version: 1.0.0
+version: 1.0.1
 date: 2025-03-15
-lastmod: 2025-06-18
-generated: 2025-12-02
+lastmod: 2026-01-18
+generated: 2026-01-18
 ---
 
 ### Definition by NERC
@@ -26,7 +27,9 @@ Source: <d-cite key="kundur1994Power"></d-cite> p716-717, first edition
 
 > One problem in using right and left eigenvectors individually for identifying the relationship between the states and the modes is that the elements of the eigenvectors are dependent on units and scaling associated with the state variables. As a solution to this problem, a matrix called the **participation matrix** ($P$), which combines the right and left eigenvectors as follows is proposed in reference 2 as a measure of the association between the state variables and the modes.
 
-More details from the book are excerpted below for reference:
+More elaboration can be found in <d-cite key="sun2021smallsignal"></d-cite>.
+
+More details from the book are also excerpted below for reference:
 
 $$ P = [ P_1 \quad P_2 \quad \dots \quad P_n ] $$ (12.49A)
 

_wiki/reliability.md

@@ -11,10 +11,10 @@ related:
 authors:
   - name: Jinning Wang
     url: https://jinningwang.github.io
-version: 1.0.0
+version: 1.0.1
 date: 2025-03-15
-lastmod: 2025-06-22
-generated: 2025-12-02
+lastmod: 2026-01-18
+generated: 2026-01-18
 ---
 
 ### Definition in an Article by a Joint Task Force of IEEE and CIGRE
@@ -29,3 +29,20 @@ Source: <d-cite key="kundur2004stability"></d-cite>
 Source: <d-cite key="nerc2013terminology"></d-cite>
 
 > NERC defines the reliability of the interconnected Bulk-Power System in terms of two basic and functional aspects, [adequacy](/wiki/adequacy), and [operating reliability](/wiki/operating-reliability).
+
+### Definition by NREL
+
+Source: <d-cite key="geocaris2022assessing"></d-cite>
+
+> To frame the issue of reliability, researchers at the National Renewable Energy Laboratory (NREL) use the "three Rs of power system reliability": resource adequacy, operational reliability, and resilience.
+
+### Definition by FERC
+
+Source: <d-cite key="ferc2023reliability"></d-cite>
+
+> The grid remains functional even during unanticipated but common system disturbances, such as loss of a source of energy generation from an energy provider or failure of some other system element. When something fails, the grid has to be able to isolate the problem and keep functioning.
+>
+> Grid reliability is based on two key elements:
+>
+> 1. Reliable operation – A reliable power grid has the ability to withstand sudden electric system disturbances that can lead to blackouts.
+> 2. Resource adequacy - Generally speaking, resource adequacy is the ability of the electric system to meet the energy needs of electricity consumers. This means having sufficient generation to meet projected electric demand.

_wiki/security.md

@@ -7,6 +7,7 @@ tags:
   - ieee-task-force
   - cigre
   - article
+  - China
 related:
   - stability
   - reliability
@@ -16,7 +17,7 @@ authors:
 version: 1.0.0
 date: 2025-03-15
 lastmod: 2025-06-22
-generated: 2025-12-02
+generated: 2026-01-18
 ---
 
 ### Definition in an Article by a Joint Task Force of IEEE and CIGRE
@@ -25,3 +26,21 @@ Source: <d-cite key="kundur2004stability"></d-cite>
 
 > Security of a power system refers to the degree of risk in its ability to survive imminent disturbances (contingencies) without interruption of customer service.
 > It relates to robustness of the system to imminent disturbances and, hence, depends on the system operating condition as well as the contingent probability of disturbances.
+
+### Definition in China grid operation code
+
+Source: <d-cite key="gbt2022"></d-cite> p8
+
+> 电力系统安全性：电力系统在运行中承受扰动（例如突然失去电力系统的元件，较大功率波动或短路故障等）的能力。 通过两个特性表征：
+>
+> a) 电力系统能承受住扰动引起的暂态过程并过渡到一个可接受的运行工况；
+>
+> b) 在新的运行工况下，各种约束条件得到满足。
+
+Translation:
+
+Power System Security: The ability of a power system to withstand disturbances during operation (such as the sudden loss of system components, significant power fluctuations, or short-circuit faults). It is characterized by two specific attributes: 
+
+a) The power system can withstand the transient processes caused by the disturbance and transition to an acceptable operating state;
+
+b) Under the new operating state, various constraints are satisfied.

_wiki/small-signal-stability.md

@@ -4,14 +4,16 @@ description: The ability to maintain synchronism when subjected to small disturb
 tags:
   - stability
   - book
-related: []
+related:
+  - dynamic-stability
+  - participation-factor
 authors:
   - name: Jinning Wang
     url: https://jinningwang.github.io
-version: 1.0.0
+version: 1.0.1
 date: 2025-03-15
-lastmod: 2025-06-19
-generated: 2025-12-02
+lastmod: 2026-01-18
+generated: 2026-01-18
 ---
 
 ### Definition in a Textbook

_wiki/subsynchronous-oscillation.md

@@ -0,0 +1,22 @@
+---
+title: Subsynchronous Oscillation
+description: SSO.
+tags:
+  - stability
+related:
+  - oscillation
+  - subsynchronous-resonance
+authors:
+  - name: Jinning Wang
+    url: https://jinningwang.github.io
+version: 1.0.0
+date: 2026-01-18
+lastmod: 2026-01-18
+generated: 2026-01-18
+---
+
+### Defintion in an Article
+
+Source: <d-cite key="ieee1985terms"></d-cite>
+
+> Subsynchronous oscillation is an electric power system condition where the electric network exchanges significant energy with a turbine-generator at one or more of the natural frequencies of the combined system below the synchronous frequency of the system following a disturbance from equilibrium. The above excludes the rigid body modes of the turbine-generator rotors.