A power conversion device includes a power converter including an arm circuit having a plurality of converter cells connected in cascade. Each of the converter cells includes a bridge circuit including a plurality of semiconductor switching elements, and a power storage element connected to a first input/output terminal on a high potential side and a second input/output terminal on a low potential side through the bridge circuit. One or more of the converter cells are full-bridge converter cells. Among four arms that constitute the bridge circuit of the full-bridge converter cell, an arm between a high potential-side node of the power storage element and the second input/output terminal, or an arm between a low potential-side node of the power storage element and the first input/output terminal includes a resistor element connected in series with the semiconductor switching element.

A system refers to actual weather data made publicly available by a first institution, and creates a model that uses a value of a weather element for each section as an input and uses a value of a renewable energy power generation amount of the area as an output based on the actual value of the weather element calculated for each section, and the actual value of the renewable energy power generation amount of the area. The system refers to weather prediction data made publicly available by the second institution, and calculates an actual value of the weather element regarding each of the plurality of sections including the area based on a prediction value of the weather element for each segment in the corresponding section, and calculates a prediction value of the renewable energy power generation amount based on the prediction value of the weather element for each section.

A microgrid controller may measure a group state-of-charge (SOC) of a group of energy storage systems (ESSs), calculate a total real power demanded by a plurality of loads, determine an available real power for a group of renewable-energy-based (REB) energy resource systems, determine whether the available real power is greater than a sum of the total real power and an ESS parasitic consumption of the group of ESSs, and, based on the available real power being greater than the sum, generate first control signals for turning off a group of fuel-based (FB) energy resource systems or for maintaining the group of FB energy resource systems in an off-state, or, based on the available real power being less than or equal to the sum, generate second control signals for turning on the group of FB energy resource systems or for maintaining the group of FB energy resource systems in an on-state.

There is disclosed herein a converter valve assembly (20) for a power grid system, comprising two or more equal groups (6a, 6b, 6c) of prismatic converter cells (3a-ad), each group (6a, 6b, 6c) being arranged in a respective plane (7a, 7b, 7c) of a plurality of parallel planes spaced apart along a horizontal axis (8). Converter cells (3a-j) in a group (6a) are connected in series, and the groups (6a, 6b, 6c) are connected in series along the axis (8). The prismatic converter cells (3a-j) in a group (6a) are arranged such that there is a corresponding voltage difference between each converter cell (3a-j) in the group (6a) and each corresponding converter cell (3k-t) in an adjacent group (6b) that is a spatially nearest to said each converter cell (3a-j), during operation of the converter valve assembly (20). Therefore, a spacing between groups may be reduced and an overall volume of the converter valve assembly may be reduced.

In one aspect, an electrical grid for an isolated hybrid power plant includes a first grid section configured to be connected to at least one wind power installation, be connected to at least one gas production installation, and transport an electrical power generated by the wind power installation to the at least one gas production installation; a second grid section configured to be connected to the at least one gas production installation; and a grid converter configured to electrically connect the first grid section and the second grid section to one another and bidirectionally exchange electrical power between the first electrical grid section and the second electrical grid section.

A method is for testing a functionality of a system of a wind turbine. The system includes an electro-mechanical actuator, an energy storage unit, and an energy dissipating element connectable to the energy storage unit for selectively transferring energy from the energy storage unit to the energy dissipating element. The method includes: providing first information representative of an operating mode of the system, and, if the operating mode is a test mode: causing a discharging of energy from the energy storage unit and a supply of at least a portion of the discharged energy to the energy dissipating element; receiving measurements being representative of a state of at least one of the energy storage unit and the energy dissipating element during the discharging and the supply; and determining a functionality of at least one of the energy storage unit and the energy dissipating element based on the measurements.

The present disclosure relates to a system 1000 for continuous, demand-based energy supply of a building 2000, comprising: a first energy supply module 100 for providing an amount of energy of a first form of energy, a first energy converter module 200, which has a first, primary load-dependent energy converter 210 for primary load-dependent conversion of a part of the provided amount of energy of the first form of energy into a second form of energy that is different from the first form of energy, and a first energy storage 220/230 for storing an amount of energy of the second form of energy, a consumer module 600/800 that has at least one consumer of the building 2000 for consuming a demand-dependent amount of energy of the first form of energy and/or a demand-dependent amount of energy of the second form of energy, and a control unit 900 for controlling the modules of the system 1000, the system 1000 further comprising a second energy converter module 300 which has a second energy converter 310 for converting another part of the amount of energy of the first form of energy into a third form of energy different from the first and second forms of energy, wherein in the conversion of the other part of the amount of energy of the first form of energy into the third form of energy, at the same time a part of the other part of the amount of energy of the first form of energy is converted into the second form of energy, a second energy storage 320 for storing the amount of energy of the third form of energy, and a third energy converter 330/340 for converting a stored amount of energy of the third form of energy into the first form of energy, wherein when converting the stored amount of energy of the third form of energy into the first form of energy, a part of the amount of energy of the third form of energy is simultaneously converted into the second form of energy.

The present disclosure provides a method and system for utilizing a supercapacitor to participate in off-grid backup power regulation for a wind turbine generator, a device and a medium, and the method includes the following steps: S1, calculating an active power allocation requirement and a reactive power allocation requirement of a target wind farm, respectively; S2, determining active allocated power and reactive allocated power for a supercapacitor and a wind turbine in each wind turbine generator according to the obtained active power allocation requirement and reactive power allocation requirement of the target wind farm; and S3, adjusting an active power target value and a reactive power target value of each wind turbine generator according to the obtained active allocated power and reactive allocated power.

The present application relates to the technical field of microgrid operation, and in particular, to a method and system for tracking defects in key nodes of a microgrid. The method includes: obtaining and analyzing real-time data of the microgrid to obtain power generation data of each distributed wind turbine in the microgrid, and analyzing the power generation data to predict a total generating power within a preset time; obtaining an operating power required for stable operation of the microgrid based on analysis results of the real-time data; determining a total charging power for energy storage devices based on the operating power and total generating power; obtaining an operating status, a usage frequency, and a distribution status of each energy storage device, and determining a charging power that should be allocated to each energy storage device based on the total charging power, operating status, usage frequency, and distribution status.

Disclosed are a black start control method and system for a distributed energy storage system and a permanent-magnet direct-drive type wind turbine generator set, which belong to the technical field of power system control. The method is suitable for a black start coordinated control method for distributed energy storage and a wind turbine generator set. The method includes: firstly, controlling a pitch angle based on a direct-current voltage, and flexibly adjusting output of the wind turbine generator set according to load demand; and introducing secondary control into a voltage and current correction process of primary control, so as to realize coordinated control over the distributed energy storage system and the wind turbine generator set.