Interval optimal scheduling of hydro‐PV‐wind hybrid system considering firm generation coordination

Liu, Yangyang; Tan, Shengmin; Jiang, Chuanwen

doi:10.1049/iet-rpg.2016.0152

Cited by 33 publications

(16 citation statements)

References 28 publications

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“…Finally, we establish the relation between the mean hydropower generation

{\bar{P}}_{normalG i}

and turbine discharge

Q_{normalH i}^{turb}

over the time interval

t \in [0, T]

. The electrical power of a hydropower plant is a non‐linear function of water head

H_{H i}^{normalhead} : = H_{H i}^{normalup} - H_{H i}^{normaldown}

and

Q_{normalH i}^{turb}

, known as the production function [24], which is expressed as

\begin{matrix} true \\ right {\bar{P}}_{normalG i} = f_{normalH i} (() H_{H i}^{normalhead}, Q_{H i}^{normalturb}), i \in Ω^{G} . \end{matrix}

…”

Section: Dynamic Modeling Of Islanded Power Systems With Cascaded Run‐of‐the‐river Hydropowermentioning

confidence: 99%

Tertiary regulation of cascaded run‐of‐the‐river hydropower in the islanded renewable power system considering multi‐timescale dynamics

Qiu

Lin

Liu

et al. 2021

IET Renewable Power Gen

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To enable power supply in rural areas and to exploit clean energy, fully renewable power systems consisting of cascaded run‐of‐the‐river hydropower and volatile energies such as photovoltaic (pv) and wind are built around the world. In islanded operation, the primary and secondary frequency controls, that are hydro governors and automatic generation control (AGC), are responsible for the frequency stability. However, due to limited water storage capacity of run‐of‐the‐river hydropower and river dynamics constraints, without coordination between the cascaded plants, the traditional AGC cannot fully exploit the adjustability of hydropower. When imbalances between the volatile energy and load occur, load shedding can be inevitable. To address this issue, this paper proposes a coordinated tertiary control approach by jointly considering power system dynamics and the river dynamics that couples the cascaded hydropower plants. To unify the multi‐timescale dynamics of the power system and river dynamics to establish a controller that coordinates the cascaded plants, the relation between AGC parameters and turbine discharge is approximated by a polynomial surrogate model. The cascaded plants are coordinated by optimising AGC participation factors in a receding‐horizon manner. Simulation of a real‐life system shows the proposed method significantly reduces load loss under pv volatility.

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“…Finally, we establish the relation between the mean hydropower generation

{\bar{P}}_{normalG i}

and turbine discharge

Q_{normalH i}^{turb}

over the time interval

t \in [0, T]

. The electrical power of a hydropower plant is a non‐linear function of water head

H_{H i}^{normalhead} : = H_{H i}^{normalup} - H_{H i}^{normaldown}

and

Q_{normalH i}^{turb}

, known as the production function [24], which is expressed as

\begin{matrix} true \\ right {\bar{P}}_{normalG i} = f_{normalH i} (() H_{H i}^{normalhead}, Q_{H i}^{normalturb}), i \in Ω^{G} . \end{matrix}

…”

Section: Dynamic Modeling Of Islanded Power Systems With Cascaded Run‐of‐the‐river Hydropowermentioning

confidence: 99%

Tertiary regulation of cascaded run‐of‐the‐river hydropower in the islanded renewable power system considering multi‐timescale dynamics

Qiu

Lin

Liu

et al. 2021

IET Renewable Power Gen

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show abstract

“…The complementary characteristics of inflow, wind speed, and sunlight in southwestern hydropower bases can help to reduce volatility of the combined power. This method has been considered in some real‐world projects such as Yunnan [35] and Yalong River [36]. Specifically, electricity production coordination should be carried out in long‐ and medium‐term operations to determine the total scale of electricity transfer and reasonable reservoir level range at different key periods, with the consideration of wind and solar electricity prediction.…”

Section: Solutions For Boosting Hydropower Absorptionmentioning

confidence: 99%

Overview of China's hydropower absorption: evolution, problems, and suggested solutions

Shen

Cheng

Shen

et al. 2019

IET Renewable Power Generation

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China has experienced an unprecedented increase in hydropower development with the implementation of the 'West-East Electricity Transfer' project. Its total hydropower capacity has reached 350 GW, of which nearly one-third is transmitted to the load centre through an ultra-high-voltage power network. However, the absorption of abundant hydropower in southwest China is still a challenge, with increasing hydropower curtailment each year. This study provides an overview of the evolution of hydropower absorption, analyses the major problems and possible causes, and suggests several technical solutions. It is suggested to optimise the generation operations with power network limitations and transmission schedules to make full use of transmission channels and improve operational flexibility. Meanwhile, receiving power grids should coordinate the operations between southwestern hydropower and their local plants, and hydropower allocation among subordinate power grids. The differences in operation characteristics, regulation ability, and load demands will be helpful for efficiently absorbing large-scale outer hydropower. Reasonable economic incentives and compensation mechanisms are considered as another method to alleviate hydropower curtailment. Ancillary service market and discrepant electricity prices during different receivers and different periods are suggested. The overall analysis results indicate that there is great space for promoting hydropower absorption under existing transmission channel conditions.

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“…Wind, solar and hydro are complementary in time and space [7]. The introduction of hydropower can enhance the flexibility and adjustability of complementary generation systems, which can also increase the overall utilization level of renewable energy [8][9]. Yuan An et al [10] establish a coordinated optimization model with the minimum output volatility, and compare scheduling schemes of a multi-energy power system in three different weather conditions in Qinghai Province.…”

Section: Introductionmentioning

confidence: 99%

A Short-Term Optimal Scheduling Model for Wind-Solar-Hydro Hybrid Generation System With Cascade Hydropower Considering Regulation Reserve and Spinning Reserve Requirements

et al. 2021

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Interval optimal scheduling of hydro‐PV‐wind hybrid system considering firm generation coordination

Cited by 33 publications

References 28 publications

Tertiary regulation of cascaded run‐of‐the‐river hydropower in the islanded renewable power system considering multi‐timescale dynamics

Tertiary regulation of cascaded run‐of‐the‐river hydropower in the islanded renewable power system considering multi‐timescale dynamics

Overview of China's hydropower absorption: evolution, problems, and suggested solutions

A Short-Term Optimal Scheduling Model for Wind-Solar-Hydro Hybrid Generation System With Cascade Hydropower Considering Regulation Reserve and Spinning Reserve Requirements

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