Abstract
The scheme of a renewable hybrid power plant with the extended use of the installed equipment of the pumped storage unit for the conversion of the photovoltaic and wind generators direct current to the alternating one is proposed.The scheme is based on existing components with widely used proven technology. To output the power of solar and wind generators to the grid and for DC to AC conversion, a synchronous generator of the pumped storage unit is used in addition to grid inverters. An induction motor, powered through a variable frequency drive from a common DC bus, is used together with a hydraulic turbine to rotate the generator. In addition, batteries and capacitors banks are connected to the DC bus.The possibility of using various types of electric machines to drive a synchronous generator is analyzed and the preference of an induction motor is shown. The response of an induction motor to rotational speed fluctuations is modeled and its capability to participate in the network frequency regulation is shown. With the example of a typical daily load and generation profile, it is shown that the proposed solution for DC to AC conversion has an efficiency close to that of the grid inverter.The proposed scheme of the hybrid power plant can increase the reliability of renewable energy sources and the stability of the network frequency. This is achieved due to increasing the inertia of the rotating masses in the power system, the power factor control capabilities of the synchronous generator and the proper response of induction motor to rapid fluctuations of the rotation speed. The creation of such hybrid power plants opens the way for a further increase in the share of renewable energy sources in the power system
Highlights
Electrical power generation is changing dramatically around the world
As a result of comparison of various renewable hybrid power plant schemes comprising photovoltaic system (PV), wind generator (WG) and pumped-storage power plants (PSPP), it was determined that a rational configuration of a renewable hybrid power plants (RHPP) contains an induction motor coupled by the same shaft with a pumped storage unit synchronous generator and turbine
The induction motor is connected through a variable frequency drive to a photovoltaic and wind generators common DC bus
Summary
Electrical power generation is changing dramatically around the world. The installed capacity of wind and solar power plants is already measured in hundreds of GW. Mainly maneuverable gas turbine units and pumped-storage power plants (PSPP) are used to compensate the negative impact of renewable energy (RE) sources on the stability of the power system. We can see accelerated growth of different kinds of renewable hybrid power plants (RHPP) which can incorporate photovoltaic systems, wind generators and powerful Li-Ion storage battery units. This promising technology ensures stable generation of electricity and high maneuverability level of RHPP but it still has a number of drawbacks. The true potential of this type of plants has not yet been fully shown; and they can solve the problems that we will encounter as the use of Li-Ion storage batteries in power systems increases
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