Design of a battery energy storage system (BESS) in a buffer scheme is examined for the purpose of attenuating the effects of unsteady input power from wind farms. The design problem is formulated as maximization of an objective function that measures the economic benefit obtainable from the dispatched power from the wind farm against the cost of the BESS. Solution to the problem results in the determination of the capacity of the BESS to ensure constant dispatched power to the connected grid, while the voltage level across the dc-link of the buffer is kept within preset limits. A computational procedure to determine the BESS capacity and the evaluation of the dc voltage is shown. Illustrative examples using the proposed design method are included.

Determination of battery storage capacity in energy buffer for wind farm

The possibility of onsite production and flexible consumption is transforming consumers from passive users to active service providers in power systems with the large share of renewable energy sources. The prosumer-centric paradigm brings diverse possibilities by introducing real-time (RT) pricing, enabling easy and fast change of the supplier, creating opportunities for aggregation, enabling local energy production and local energy exchange, as well as the provision of ancillary services. The paper brings a comprehensive review of the evolution of the diverse options for prosumer to exploit their potential. It starts with the analysis of models and opportunities for a single end-user who decided to invest in Photovoltaic (PV), electric vehicles, and flexible devices. Aside from the review, the paper challenges the logic of the prosumer responding to dynamic prices and providing power system flexibility and compares it with the logic of lowering only their electricity bill. It further analyses different types of aggregation, such as energy communities or microgrids, combined market participation with RES, but also decentralization models designed to stimulate internal energy exchange and solve network problems locally. Finally, it discusses the possibility of providing service to both Transmission and Distribution System Operator and the complexity such coordination requires when procuring flexibility services from resources connected to the distribution network or aggregated prosumers. In addition to a comprehensive review and discussion, the paper brings easy-to-understand models and belong results for the reviewed cases of a) single prosumer flexibility, b) aggregated multiple flexible prosumers, c) energy community with the possibility of peer-to-peer trading.

Prosumers as active market participants: A systematic review of evolution of opportunities, models and challenges

In the power market, the reasonable configuration of the energy storage (ES) system can improve the reliability and economy of the active distribution network system. First, the stepped multiprice and multitime demand side response (DSM) model is proposed. Second, the energy type and the power type energy storage device are used together. The supercapacitor device is used to stabilize the fluctuation of the distributed power source. The lithium iron phosphate battery is used to reduce the power shortage rate of the load. At the same time, line loss is considered in the optimization goal. The location and capacity of the hybrid energy storage device are discussed. Finally, the time-of-use tariff policy is considered, the power compensation cost of the interruptible load is calculated, the DSM policy is introduced, and the joint planning with the ES system is realized.

Hybrid Energy Storage Capacity Allocation Method for Active Distribution Network Considering Demand Side Response

Hybrid energy storage systems (HESSs) have become an effective solution for smoothing the active power variations of photovoltaic (PV). In order to reduce the required capacities and costs of the HESS, a coordinated control scheme is developed to mitigate the power variations of a PV plant by using the HESS and the active power curtailment (APC) of PV. Furthermore, a multi-objective optimization model is established to dispatch the output power of batteries and supercapacitors, considering the overall losses and the state-of-charge (SOC) deviation of the supercapacitor. Based on the proposed smoothing strategy, an allocation model is developed to optimize the energy and power capacities of the HESS with the aim of maximizing the annual net income of the PV and HESS plant. The numerous simulations are carried out to verify the effectiveness of the proposed smoothing and allocation methods by using the real data of a PV plant. In addition, we also discuss the impacts of the different dispatching strategies of the HESS, grid requirements of power variations, and solution methods on the HESS allocation results.

/pdf/optimal-allocation-of-hybrid-energy-storage-systems-for-31vljm6c83.pdf

Optimal Allocation of Hybrid Energy Storage Systems for Smoothing Photovoltaic Power Fluctuations Considering the Active Power Curtailment of Photovoltaic

In this paper, a non-linear programming model to operate distribution systems considering energy storage devices and distributed generation is presented. Mathematical formulation is made taking in to account four terms for minimization: The cost operation of the electrical grid, reducing greenhouse emissions, reduction of electrical losses in conductors and voltage profile improve. As model constraints are employed the active a reactive nodal power balance, maximum capacities from distributed generation and energy storage devices, and the voltage profile regulation. To solve the proposed mathematical model a commercial optimization software GAMS and CONOPT solver are employed. To verify the efficiency and applicability of the model developed are used two test nodes 9 and 10, which have been adapted to the typical operating conditions of Colombian distribution systems. The results show the ability to adapt to various conditions and operating instructions of the utility.

Distribution Systems Operation Considering Energy Storage Devices and Distributed Generation

In order to ensure the security, the stability and the economic operation of the power grid, the energy storage system had been widely used in the power system. By regulating the power and the operation state, the flexibility of network is increased actively, so that the economic dispatch purpose of power network is achieved. First, in this paper, the power, the capacity, the state maintenance time, the ramp rate, and other constraints of the energy storage system were considered in the study, combining with the output of wind turbine, the open downtime, and other constraints. The steady state model of the energy storage system and the unit commitment model were built. Forecasting the wind power output, the scenario analysis method was applied to optimize the total power generation cost in the power system. In the case of the wind power connected to the grid, the power grid economy with the large-scale energy storage system is boosted. At last, the practical example, considering the effects of energy storage system on the wind power generation and wind power generation and the purpose balancing the load distribution of wind turbine and reducing the cost of power generation, was analyzed. The results show that the models proposed in this paper can be successfully applied to the standard network and the generator output and the system operating cost are optimized under the condition of the research of this paper.

Economic Dispatch Application of Power System With Energy Storage Systems

To ensure the security, stability and economic operation of the grid, energy storage system had been widely used in power system. Improving the flexibility of the network by regulating the power and operational status, and also to achieve the economic dispatch purpose. Firstly, in this paper, considering the power, capacity, state maintenance time, ramp rate and other constraints of the energy storage system, combining with wind turbine output, open downtime and other constraints. To establish the steady-state model of the energy storage system and UNIT scheduling model, then by predicting wind power and using scenario analysis to achieve minimize the cost of total power production spend, achieving cost-effective operation in the case of wind power connected to the grid. At last, balancing the load distribution of the wind turbines to reduce the generation cost. From analysis the practical example, the effect of energy storage systems on wind turbines' working statues, and the acceptance of wind power.

Economic dispatch analysis of wind power integration into power system with energy storage systems

The high‐temperature electric‐actuated valve widely adopts the split structure, and the valve stem drives the opening and closing of the valve after passing through the high‐temperature packing and sealing structure. However, the transmission chain is too long, which cannot meet the pursuit of small volume and lightweight in the nuclear industry. In this paper, a novel integrated structure of high‐temperature direct drive electric‐actuated valve canned permanent magnet synchronous motor (DDEAV‐CPMSM) is proposed. The structure omits the dynamic sealing structure composed of stuffing box, pressure plate and pressure sleeve, as well as the transmission structure of gears and couplings, and the reliability is significantly improved. This paper focuses on the calculation of the dimension parameters, thermal load design, and electromagnetic vibration of DDEAV‐CPMSM, and compares it with the integrated structure of the induction motor to explore the optimal topology of the high‐temperature electric‐actuated valve. Aiming at the problem of serious heat generation in limited space, it is difficult to simulate the running time of high‐temperature valve. Based on the magneto‐thermal coupling method, a 3D temperature field model considering high‐temperature heat source, canned sleeve eddy current loss, and hydraulic friction loss is established. The steady‐state temperature distribution of the system at high temperature and the transient temperature change law of valve opening and closing are analyzed, and the minimum time of secondary start‐up and the maximum running time under fault conditions are further studied, to provide a theoretical basis for the application of DDEAV‐CPMSM. © 2022 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

Electromagnetic‐Thermal Analysis of High‐Temperature Direct Drive Electric‐Actuated Valve Canned Permanent Magnet Synchronous Motor

The traditional canned electric valve consists of an induction motor and a reducer, which need to be matched with the position sensor to achieve precise control of valve position. The position sensor and reducer are not only easily damaged in high-temperature liquids, but also the slip rate of the induction motor is greatly affected by the liquid temperature, which makes it difficult to achieve accurate control. To address the above problems, this paper introduces a new topology of canned electric valve permanent magnet synchronous motor (CEV-PMSM), and a new maximum torque per ampere (MTPA) model is proposed. The new MTPA control equation considering the canned sleeve parameters is derived theoretically. By comparing it with id = 0 control and ideal MTPA control strategy, it is proved that the new MTPA model reflects the electric valve operation characteristics more realistically. In order to achieve sensorless control of the electric valve, and to achieve fast response and high-precision control under external disturbances and parameter uncertainties, the proposed control scheme combines sensorless control and two-degree-of-freedom (2-DOF) control. Consequently, the proposed control scheme can effectively improve the static and dynamic performances of the CEV-PMSM, as well as adjust the tracking and anti-disturbance performances independently. Finally, a 2 kW 100 r/min prototype was manufactured and corresponding experiments were conducted to verify the accuracy of the analysis.

/pdf/optimization-control-of-canned-electric-valve-permanent-2j9zrwka.pdf

Optimization Control of Canned Electric Valve Permanent Magnet Synchronous Motor

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