Research on the Optimal Operation of a Novel Renewable Multi-Energy Complementary System in Rural Areas
Abstract
:1. Introduction
- Propose a new type of wind–solar–biomass–storage MECS suitable for rural areas. The system can not only effectively promote the rural energy transition but also has great significance for achieving carbon neutrality in the energy system.
- Adopt a more practical grid-connected non-sales operation mode. That is, renewable power generation is all absorbed locally, and the insufficient part is supplemented by power purchase from the power grid. This operation mode can effectively reduce wind and solar abandonment and can reduce the impact of system grid connection on the grid.
- Establish a system economic operation optimization model and use an improved genetic algorithm to realize the simulation. This method overcomes the shortcomings of the standard genetic algorithm (SGA) which is easy to converge prematurely. In addition, the simulation results are compared with the SGA to verify the effectiveness of the MPGA.
2. System Description
2.1. System Structure
2.2. Principle of System Operation
3. Methodology Description
3.1. Optimal Operation Model of the System
3.1.1. System Operation Objective
3.1.2. System Constraints
- (1)
- Load supply and demand balance constraint
- (2)
- Units output constraint
- (3)
- Daily biogas power generation constraint
- (4)
- Energy storage system operation constraint
3.2. Solution Algorithm
3.2.1. Principle of MPGA
- Multiple populations with different control parameters are introduced to optimize the search at the same time to achieve different search purposes;
- The migration operator is used to connect each population and realize the co-evolution of multiple populations;
- The optimal individuals of various group evolutionary generations are preserved by the artificial selection operator and are used as the basis for judging the convergence of the algorithm.
3.2.2. MPGA Implementation Process
4. Case Analysis
4.1. Data Description
4.2. Optimization Results
5. Discussion
- The BPG system can well make up the load demand when the wind and solar power output is insufficient, and undertake certain peak shaving tasks. On a light wind and cloudy day, the output of BPG is relatively uniform; on a light wind and sunny day or a strong wind and cloudy day, the output of BPG is small in the early morning and midnight, and the rest of the time is basically full-load operation; On a strong wind and sunny day, the trend of BPG output curve and load curve is basically consistent.
- The ESS will be charged in the case of excess wind and solar power output, in order to timely absorb the excess renewable energy and ensure the safe and stable operation of the system; it will also be charged during the low electricity price period, and be discharged during the double peak period of electricity price and load, so as to realize the low electricity peak use and increase the economic benefits of system operation.
- The system only purchases electricity from the power grid when the electricity price is low, the power generation and energy storage capacity of the system cannot meet the load demand during the peak period of power consumption, and the reduced energy storage capacity cannot meet the discharge demand during the peak load period and needs to be charged.
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Nomenclature
Abbreviations | |
BPG | Biogas power generation |
ESS | Energy storage system |
MECS | Multi-energy complementary system |
MPGA | Multi-population genetic algorithm |
PVG | Photovoltaic power generation |
SGA | Standard genetic algorithm |
SOC | State of charge |
WPG | Wind power generation |
¥ | China Yuan |
Variables | |
c | The interval length of crossover operations |
Ci | Daily operation and maintenance cost [¥] |
Est | The rated capacity of ESS [kWh] |
F | Total economic benefit of MECS [¥] |
frand | A function to generate random numbers |
G | The population number |
i | Index of facilities (WPG, PVG, BPG, ESS) |
ki | Subsidy electricity price of WPG (PVG, BPG) [¥/kWh] |
M | Daily output of BPG [kW] |
m | The interval length of mutation operations |
P () | The initial population |
PBIG () | Hourly output power of BPG [kW] |
Pc | Crossover probability [%] |
Pco | The initial crossover probability [%] |
PES () | Hourly output power of ESS [kW] |
PG () | Hourly electricity purchased from the grid [kW] |
Pi () | Hourly output power of WPG (PVG, BPG) [kW] |
Pimax | Upper limit of output power [kW] |
Pimin | Lower limit of output power [kW] |
Pload () | Hourly power load [kW] |
Pm | Mutation probability [%] |
Pmo | The initial mutation probability [%] |
PPV () | Hourly output power of PVG [kW] |
Pwind () | Hourly output power of WPG [kW] |
SOC () | Hourly SOC of ESS |
SOCmax | Upper limit of SOC |
SOCmin | Lower limit of SOC |
t | Time |
∆t | Time interval |
αt | The electricity price purchased from the grid [¥/kWh] |
β | Unit charge/discharge cost coefficient of ESS [¥/kWh] |
γt | The electricity price sold to the load terminal [¥/kWh] |
ηc | The battery charge efficiency [%] |
ηd | The battery discharge efficiency [%] |
ω | The self-discharge coefficient of ESS [%] |
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Types | Power (kW) | Cost Coefficient Per Unit Generation (¥/kWh) | Subsidy Electricity Price (¥kWh) | Average Daily Operation and Maintenance Cost (¥) | |
---|---|---|---|---|---|
Lower Limit | Upper Limit | ||||
WPG | 0 | 80 | 0.00 | 0.05 | 8.74 |
PVG | 0 | 40 | 0.00 | 0.10 | 10.98 |
BIG | 0 | 20 | 0.00 | 0.25 | 5.06 |
ESS | −10 | 10 | 0.10 | 0.00 | 1.34 |
Time (h) | Load (kW) | Wind Power Output (kW) | PV Power Output (kW) | Electricity Sales Price [¥/kWh] | ElectricityPurchase Price [¥/kWh] | ||
---|---|---|---|---|---|---|---|
Strong Wind | Light Wind | Sunny Day | Cloudy Day | ||||
1 | 67.6 | 69 | 60 | 0 | 0 | 0.46 | 0.41 |
2 | 65 | 70 | 52 | 0 | 0 | 0.46 | 0.41 |
3 | 65 | 69 | 48 | 0 | 0 | 0.46 | 0.41 |
4 | 66.3 | 65 | 44 | 0 | 0 | 0.46 | 0.41 |
5 | 72.8 | 61 | 40 | 2 | 0 | 0.46 | 0.41 |
6 | 81.9 | 65.8 | 45.6 | 6 | 2 | 0.46 | 0.41 |
7 | 91 | 69 | 48 | 10 | 4 | 0.46 | 0.41 |
8 | 97.5 | 63 | 52.8 | 20 | 10 | 0.87 | 0.82 |
9 | 98.8 | 58 | 40 | 30 | 16 | 0.87 | 0.82 |
10 | 104 | 60.6 | 46.4 | 32 | 20 | 0.87 | 0.82 |
11 | 101.4 | 62 | 48 | 34 | 20 | 1.29 | 1.04 |
12 | 96.2 | 54 | 48 | 40 | 24 | 1.29 | 1.04 |
13 | 93.6 | 57 | 45.6 | 40 | 24 | 1.29 | 1.04 |
14 | 93.6 | 49 | 40 | 40 | 20 | 1.29 | 1.04 |
15 | 98.8 | 53 | 48.8 | 36 | 16 | 1.29 | 1.04 |
16 | 104 | 50 | 46.4 | 30 | 16 | 0.87 | 0.82 |
17 | 110.5 | 65 | 44 | 20 | 12 | 0.87 | 0.82 |
18 | 114.4 | 69 | 52 | 20 | 8 | 0.87 | 0.82 |
19 | 117 | 65 | 44.8 | 10 | 4 | 1.29 | 1.04 |
20 | 113.1 | 69 | 48 | 6 | 2 | 1.29 | 1.04 |
21 | 101.4 | 77 | 57.6 | 0 | 0 | 1.29 | 1.04 |
22 | 92.3 | 73 | 52.8 | 0 | 0 | 0.87 | 0.82 |
23 | 84.5 | 69 | 60 | 0 | 0 | 0.87 | 0.82 |
24 | 72.8 | 71 | 60.8 | 0 | 0 | 0.46 | 0.41 |
Algorithm | Scenario | Economic Benefit (¥) | Operation Time (s) |
---|---|---|---|
SGA | Scenario one | 1865.6 | 652.32 |
Scenario two | 1796.8 | 586.49 | |
Scenario three | 2063.5 | 623.58 | |
Scenario four | 1942.6 | 689.41 | |
MPGA | Scenario one | 1987.4 | 26.01 |
Scenario two | 1861.6 | 25.89 | |
Scenario three | 2155.7 | 24.93 | |
Scenario four | 2082.2 | 26.75 |
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Wang, T.; Wang, Q.; Zhang, C. Research on the Optimal Operation of a Novel Renewable Multi-Energy Complementary System in Rural Areas. Sustainability 2021, 13, 2196. https://doi.org/10.3390/su13042196
Wang T, Wang Q, Zhang C. Research on the Optimal Operation of a Novel Renewable Multi-Energy Complementary System in Rural Areas. Sustainability. 2021; 13(4):2196. https://doi.org/10.3390/su13042196
Chicago/Turabian StyleWang, Ting, Qiya Wang, and Caiqing Zhang. 2021. "Research on the Optimal Operation of a Novel Renewable Multi-Energy Complementary System in Rural Areas" Sustainability 13, no. 4: 2196. https://doi.org/10.3390/su13042196