Stochastic Model Based Optimisation Path Study of Off-grid Optical Storage Microgrid Configuration and Economy

Figure 1.

Figure 2.

Wind speed, light intensity, temperature and latency load in a region

Time	Wind speed (m/s)	Illumination intensity (°/m2/day)	Ambient temperature (°C)	Latency load (kW)
January	3.23	2.4	-7.5	51.7
February	4.38	2.85	-4.6	45.5
March	3.6	3.15	2.5	48.7
April	2.94	4.02	9.4	50.7
May	2.88	4.17	13.6	45.8
June	2.72	6.91	22.7	49.8
July	2.84	6.16	25.9	48.2
August	4.1	6.01	22.8	51.6
September	3.81	5.32	19.2	48
October	4.02	4.87	8.9	48.5
November	4.28	4.73	-0.4	45.8
December	4.21	4.51	-5.8	50.9

Cost parameters of the net type optical storage micronet equipment

Device name (yuan/kW)	Installation cost	Replacement cost	Operating maintenance cost	Service life (Year)	Fuel cost
Wind generator (WT)	15000	——	0.09%	25	——
Photovoltaic cell (PV)	14500	——	0.05%	25	——
Photovoltaic MPPT	700	——	0.06%	25	——
Diesel generator (Gen)	850	590	0.74 yuan/h	17500h	5.08 yuan/L
Fuel cell (FC)	16800	14200	0.19 yuan/h	55000h	——
Electrolytic cell (ELE)	7840	——	0.03%	25	——
Hydrotank (HT)	2600	——	0.78%	25	——
Flow converter	4800	——	0.98%	25	——
Accumulator	1500	950	1.15%	3	——
Gas boiler	600	——	1.5%	25	3.52 yuan/m3
Microgrid controller	18000	——	0.95%	25	——

Optimize the configuration results of the energy storage system

Scheme type	WT	PV (kW)	MPPT (kW)	Gen (kW)	Battery	Converter (kW)	FC (kW)	ELE (kW)	HT (kg)
A1	55	——	——	——	2500	356.1	——	——	——
B1	55	——	——	——	2900	334.8	——	——	——
A2	——	450	450	——	2900	85.9	——	——	——
B2	——	450	450	——	3200	83.1	——	——	——
A3	18	320	320	——	2400	95.4	——	——	——
B3	18	320	320	——	2500	91.8	——	——	——
A4	15	290	290	40	600	102.3	——	——	——
B4	15	290	290	40	1200	98.7	——	——	——
A5	15	290	290	——	650	36.5	45	18	18
B5	15	290	290	——	1200	58.4	45	18	18

Optimize economic indicators

Scheme type	NPC (yuan)	LCOE (yuan)	REU (%)	LLR (%)
A1	24655595.11	2.83	94.78	10.23
B1	26666925.18	2.86	94.78	10.23
A2	24184924.71	2.44	94.78	9.26
B2	24652862.85	2.71	94.78	9.16
A3	23957793.8	2.23	94.82	6.81
B3	24080801.53	2.3	94.82	6.34
A4	17754849.7	1.71	80.87	6.08
B4	19972982.57	1.73	81.35	5.92
A5	12169284.2	1.51	99.86	5.49
B5	13053573.8	1.68	98.64	4.89

Comparison of cost changes under different scenarios

Project	Original scene	New scene
Photovoltaic installation (yuan)	25481635.52	22635487.92
Replacement cost (yuan)	42563.25	39425.62
Operating maintenance cost (yuan)	11524.63	10524.63
Photovoltaic subsidy cost (yuan)	27846.24	25146.62
Net loss cost (yuan)	1852.64	1524.28
Light storage rate	13.24%	16.47%
Voltage deviation indicator	0.8215	0.7942
Net loss index	0.3265	0.3148

Wind speed and solar radiation statistics

Season	Wind velocity distribution parameter		Wind velocity wibull distribution parameters
	k	c	α	β
Spring	2.65	5.94	2.16	0.45
Summer	1.74	6.34	2.99	0.72
Autumn	2.59	6.85	2.34	0.59
Winter	2.74	6.92	2.07	0.45
Average annual	2.43	6.51	2.39	0.55