Research on the operation of integrated energy microgrid based on cluster power sharing mechanism

Figures & data

Figure 1. Microgrid cluster architecture.

Figure 2. (a) MGa Forecast values of pre-day electrical load, thermal load and wind turbine output. (b) MGb day-ahead electric load, thermal load and wind turbine output forecast. (c) MGc day-ahead electric load, thermal load and wind turbine output forecast.

Figure 2b. Continued.

Figure 2c. Continued.

Table 1. Parameters of integrated energy microgrid dispatching model.

Parameter	Numerical value	Parameter	Numerical value
$Q_{ES,0}$ (kWh)	800	$P_{\text{CCS},min}$ (kW)	0
${\eta }_{ES,c}$	0.95	$P_{\text{CCS},max}$ (kW)	600
${\eta }_{ES,d}$	0.96	$P_{\text{CHP},min}$ (kW)	0
$Q_{ES,min}$ (kWh)	500	$P_{\text{CHP},max}$ (kW)	2000
$Q_{ES,max}$ (kWh)	1800	$\alpha$	0.55
$P_{\text{P}2\text{G},min}$ (kW)	0	$\beta$ (kg/kWh)	1.02
$P_{\text{P}2\text{G},max}$ (kW)	300	$H_{\text{GB},min}$ (kW)	0
$P{}_{k,tmax}^{\text{buy }}$ (kW)	500	$H_{\text{GB},max}$ (kW)	500
$P{}_{k,tmax}^{\text{sell }}$ (kW)	2000	${\eta }_{GB}$	0.9
$c_{\text{v}1}$	0.15	$A$ (kg/kWh)	0.424
$c_{v2}$	0.25	$\epsilon$ (CHY/kg)	0.5
$C_m$	0.82	$\zeta$ (CHY/kWh)	0.01
$a_{\text{c}{\text{o}}_2}$ (Kg/kWh)	0.93	$U{p}_{k,\text{t}}^{\text{C}{\text{H}}_4}$ (CHY/m^3)	2.9
$b_{\text{co}{\text{s}}_2}$ (Kg/kWh)	0.0015	$c_{\text{P}2\text{G}}$ (CHY/kW)	0.022
$c_{\text{c}{\text{o}}_2}$	28.79	$d_{\text{P}2\text{G}}$ (CHY/Kg)	0.064

Table 2. Electricity purchasing price and selling price of Microgrid.

Time	Electricity purchase price (CHY /kWh)	Electricity sales tariff (CHY/kWh)
Valley period (23:00—05:00)	0.25	0.2
Normal interval (06:00–08:00, 12:00–18:00, 21:00–22:00)	0.62	0.2
Peak period (09:00–11:00, 19:00–20:00)	0.92	0.2

Figure 3. Microgrid cluster total operating cost convergence curve.

Figure 4. Electricity trading results of each subject in the microgrid cluster.

Figure 5. Electricity trading tariff results within the microgrid cluster.

Figure 6. Power balance results for each subject within the microgrid cluster. (a) MGa; (b) MGb; (c) MGc.

Table 3. Carbon emissions before and after microgrid cluster sharing with source-load uncertainty.

Microgrid number	Independent operation carbon emissions/kg	Independent carbon trading cost/CHY	Carbon emission/kg after microgrid cluster sharing	Carbon transaction cost/yuan after microgrid cluster sharing	Carbon emission reduction /kg
MGa	30199.61	−14378.48	27968.88	−15544.7	2230.73
MGb	6526.36	−7364.84	6033.33	−7403.38	483.03
MGc	18134.91	−4884.07	17841.86	−8702.57	293.05
Microgrid cluster	54860.88	−26627.4	51844.07	−31650.65	3006.81

Table 4. Benefit and cost studies before and after microgrid cluster sharing under source-load uncertainty.

Microgrid number	Independent running cost (CHY)	Microgrid cluster sharing cost (CHY)	Negotiating power	Secondary allocation	Cost reduction
MGa	7318.47	2996.06	1.17	2037.68	958.38
MGb	5861.00	−1371.60	2.13	−5499.71	4128.11
MGc	23056.05	17663.79	0.85	22750.71	−5086.92
Microgrid cluster	36235.52	19288.25		19288.25

Table 5. Comparison of benefit distribution of standard Nash models.

Microgrid number	Independent running cost (CHY)	Microgrid cluster sharing cost (CHY)	Secondary allocation	Cost reduction
MGa	7318.47	2996.06	1989.28	1006.78
MGb	5861.00	−1371.60	−5819.32	4447.72
MGc	23056.05	17663.79	23122.16	−5458.37
Microgrid cluster	36235.52	19288.25	19288.25

Figure 7. Relationship between confidence and operating costs.