It is of great significance to optimize the planning and layout of new energy power generation projects on the basis of fully comparing the competitiveness of various new energy power generation projects to promote the highquality development of the regional new energy industry. In order to scientifically measure the competitiveness of various new energy power generation projects in the region and analyze the competition pattern of regional new energy power generation projects, this paper constructs a model of niche width, intensity and overlap of regional new energy power generation projects based on the niche theory, and takes the western region of Inner Mongolia as an example, combined with the operation data of new energy power generation projects in 2022, to measure and analyze the ecological niche of wind power and solar power generation projects in each league city. The results show that there is a mismatch between the niche "structure" and the "scale" width of new energy power generation projects in the western region of Inner Mongolia, and it is necessary to continuously optimize the structure and scale of new energy installed capacity in Ulanqab and Bayannur City. The intensity of new energy niche in the "HohhotBaotouOrdosWuha" area is low, and the development of distributed new energy power generation projects should be considered in the future. The ecological niche overlap between Wuhai and other cities in the western region of Inner Mongolia is low, indicating that Wuhai area has strong potential for new energy development. The research results can provide theoretical support for regional new energy planning, and also provide a decisionmaking basis for the project development of energy investment enterprises.

Aiming at the problem that the random fluctuation of new energy output in new energy power grid leads to the large demand for system flexibility and the imbalance between supply and demand of flexibility, this paper proposes a robust optimization planning method for electric – hydrogen energy storage in new energy power grid considering flexibility. Firstly, the operation characteristics of electrohydrogen conversion facilities and electrohydrogen energy storage facilities in the new energy grid are analyzed, and the electrohydrogen energy coupling model is established. Secondly, the characteristics of flexibility demand and flexibility supply capacity after the introduction of electrohydrogen energy storage are analyzed, and the flexibility margin index of new energy power grid considering electrohydrogen energy storage is established. Then, with the goal of minimizing the cost, a robust optimization planning model for the distribution of electricityhydrogen energy storage in new energy power grids considering flexibility is established. Finally, through the simulation of IEEE 33 node system, it is verified that the proposed method can determine the configuration capacity of electrohydrogen energy storage in new energy power grid and improve the flexible adjustment ability of new energy power grid system.

A dual closedloop control strategy based on a combination of linear auto disturbance rejection and proportional integral control is proposed to address the resonance phenomenon of multiple inverters connected to the grid caused by the coupling effect between grid impedances. Firstly, based on the topology of multiple inverters, a mathematical model of the grid connected system with multiple inverters is established, and the mechanism of resonance generation is analyzed; Then, an equivalent circuit model of a multi inverter grid connected system is established, and the thirdorder system is processed in stages. The secondorder system adopts secondorder auto disturbance rejection, and the firstorder system adopts proportional integral control, forming a dual closedloop control strategy; Furthermore, the Lyapunov stability function is established to prove the stability of the closedloop control system; Finally, establish a digital simulation model of the parallel inverter system, and compare the simulation results of PI, 3rd order auto disturbance rejection, and improved linear auto disturbance rejection simultaneously; The results show that the proposed dual closedloop control strategy not only has excellent resonance suppression ability, but also can achieve better stability of the system.

As wind power generation technology matures and wind power penetration continues to increase, the equivalent inertia and frequency modulation reserve capacity in power systems decrease, leading to an increased frequency modulation burden on the grid. To address the issue of insufficient inertia and frequency response capability of wind turbines due to the decoupling of rotor speed and grid frequency, this paper proposes a comprehensive control strategy for wind turbines based on fuzzy logic control. By embedding a fuzzy logic controller into the wind turbine control system, frequency modulation parameters are dynamically adjusted. On this basis, considering the operational characteristics of wind turbines at different wind speeds, the wind speed is zoned, and a comprehensive control strategy is developed to adapt to the speedpower characteristics of turbines within each zone. This improves the frequency response capability of wind turbines in medium and high wind speed zones.

Direct drive wind turbine (PMSG) has become the mainstream model and is widely used in power grid because of its superiority, but it is difficult to evaluate the influence of its control parameters on shortcircuit current characteristics due to the lack of quantitative analysis methods. Therefore, the analytic expression of threephase shortcircuit current is obtained by the calculation method of PMSG active current and reactive current through Parker transformation. Based on the trajectory sensitivity method, the influence mechanism of different control parameters on shortcircuit current is quantitatively analyzed from three aspects of generator parameters, voltage drop coefficient and PI parameter, and the parameter with greater sensitivity is selected as the leading parameter. The optimization objective function is constructed to optimize the main control parameters of PMSG short circuit current. Finally, the electromagnetic transient simulation model of PMSG was established on the PSCAD platform to verify and analyze the shortcircuit current characteristics of PMSG and the optimization effect of control parameters. The research results show that the trajectory sensitivity analysis method can quantify the influence of control parameters on shortcircuit current characteristics, and can provide guidance for parameter tuning in practical engineering.

This research investigated the effects of adding zerovalent iron (ZVI), activated carbon (AC) and magnetite (Mt)on the performance and microbiological properties of twophase anaerobic digestion of food waste. The results indicated that the addition of ZVI in the acidogenic reactor with AC and Mt in the methanogenic reactor showed the best effect on the anaerobic digestion performance. In the acidogenic reactor, the addition of ZVI increased the total volatile fatty acid concentration by 46.4%~47.9% compared with the control group, which provided better initial condition for the methanogenic reactor and significantly shortened the retardation time.In the methanogenic reactor, the addition of AC and Mt improved the stability of system, and the cumulative methane production was increased by 28.1%~68.4% compared with the control group.

The key regulatory role of trace elements(TEs) in anaerobic digestion systems has been established, but their intrinsic effects and mechanisms have not yet been fully elucidated. This study investigates the biological effects of TEs on biogas fermentation by examining the dynamic distribution of TEs under different inoculum/substrate (I/S) conditions in an anaerobic digestion system. It aims to clarify the interaction between the chemical form of TEs and the key influencing factors and microbial communities in the anaerobic fermentation process. Results from the 10 batches of experimental anaerobic digestion of glucose showed an 80.7% enhancement in cumulative methane production with the addition of TEs at an I/S ratio of 1.5. Among the three TEs (Fe, Co and Ni) added, the different chemical forms of elemental Fe showed the strongest correlation with pH, alkalinity, volatile fatty acids and ammonia nitrogen content in anaerobic digestion. The pH value was notably correlated with the four chemical forms of Fe. When the anaerobic digestion system operates stably, the relative abundance of Methanosaeta was the highest (53.8%), while the relative abundance of Methanosarcina was the highest (34.0%) when the anaerobic digestion system operates abnormally.

In this paper, Miscanthus lutarioriparius (ML) cellulose was used as the raw material to produce bioethanol by a fedbatch synchronous saccharification and fermentation process. The effects of initial substrate concentration, final substrate concentration, and feeding times on ethanol yield were analyzed. The orthogonal experiments were used to optimize the process, and the optimal process parameters were obtained as follows: Initial substrate concentration was 17.5%, and the batch feeding was conducted twice until the final substrate concentration was 32.5%. Under these conditions, the highest ethanol content could reach to 70.15 g/L, which increased by 23.36% compared to the synchronous saccharification and fermentation process without fedbatch. The material balance analysis was conducted on the basis of the optimal process. The structure of ML cellulose before and after fermentation was characterized by scanning electron microscopy, fourier transform infrared spectroscopy, and Xray diffraction. The results showed that the enzymatic saccharification and fermentation process would change the internal structure of ML cellulose, break the hydrogen bond or covalent bond, and increase the crystallinity of the substrate.

In the article, biochar was prepared from corn stover, and its structure was characterised by Fourier transform infrared spectroscopy, scanning electron microscope and specific surface area tester, and the adsorption performance of biochar on phenol under different conditions was investigated. The results showed that the microstructural integrity of the biochar gradually decreased and the pore size gradually increased with the increase of carbonation temperature, and the surface contained a large number of polar functional groups, which had a good promotion effect on the adsorption of phenol in solution; the best adsorption performance was obtained for the biochar prepared at a carbonation temperature of 600 °C, with water vapour as the ambient gas and corn stover with a particle size of 40 mesh; the best adsorption performance was achieved when the dosage of CSBCW600 was 0.5 g, the reaction temperature was 35 °C, the oscillation frequency was 150 r/min, the adsorption time was 4 h, the initial concentration of phenol was 100 mg/L, and the reaction volume was 50 mL, 99.5% of phenol was removed.

The article focuses on corn stover as the research subject and prepares black titanium dioxide (RTiO₂) photocatalyst using the sodium borohydride reduction method. Through comparisons of different pretreatment results, the alkali photocatalytic pretreatment technology was selected. With the yield of reducing sugar and the main components of corn stalks as evaluation indicators, the study explores the impact of various factors, including photocatalyst concentration, reaction time, H2O2 concentration, and NaOH concentration, on the pretreatment effectiveness. The FTIR, XRD, and SEM analyses show that, compared with other pretreatment methods, the physical properties and microstructure of corn stover undergo significant changes after alkaline photocatalytic pretreatment, the lignin removal rate is effectively improved is effectively improved, which favors the subsequent enzymatic hydrolysis of corn stover.