New energy power station system based on energy storage complementary smooth grid connection

Abstract

The invention belongs to the technical field of electric power of new energy, and particularly relates to a new energy power station system based on energy storage complementary smooth grid connection. The new energy power station system based on energy storage complementary smooth grid connection comprises a fluctuant new energy generating device A, a fluctuant new energy generating device B, a storage battery managing system, a direct-current deployment device, a generation assessment monitor, a generation power tracking, regulating and controlling device, a string formation type new energy grid-connected inverter, a bidirectional energy storage inverter, a new energy generation grid-connected inverter, an energy management and control system, a plurality of storage batteries, an energy storage subsystem, an energy storage grid-connected power regulating and controlling device, an environment monitoring system, a transformer, a communication network and a power grid. The problem of new energy electric power grid-connected fluctuation is solved effectively, black start and autonomous controlled power supplying of a new energy generating system are realized, the storage batteries are charged and discharged in a controlled manner and run safely and healthily, and the service life of the new energy power station system is prolonged.

Description

technical field [0001] The invention belongs to the technical field of new energy electric power, and in particular relates to a new energy power station system based on energy storage complementary and smooth grid connection. Background technique [0002] Through the development in recent years, new energy power such as photovoltaic, wind power and tidal power generation is gradually developing from the small-scale off-grid system in the past to distributed grid-connected and large-scale grid-connected power generation. Grid-connected power generation technology based on complementary energy storage has been extensively studied. [0003] However, since photovoltaic, wind power and tidal power generation are affected by the changing climate, the output power of new energy power generation stations such as photovoltaic, wind power and tidal power generation is not stable, resulting in fluctuations in power supply. When the generated power reaches a certain scale and proporti...

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Problems solved by technology

[0003] However, due to the influence of new energy power such as photovoltaic, wind power and tidal power generation due to the volatile climate, the output power of new energy power stations such as photovoltaic, wind power and tidal power generation is not stable, resulting in fluctuations in power supply

When the generated power reaches a certain scale and proportion, power fluctuations will bring harm to the operation of the power grid, and the current existing technical methods mainly use new energy power generation systems and energy storage systems to be connected to the power grid separately. When new energy power generation fluctuates and changes, The energy storage system needs a certain amount of time for the monitoring and control system to monitor the power generation change to analyze and implement regulation, and for the energy storage system to execute the power regulation and compensation command and complete the energy storage compensation power, often because the compensation time exceeds the time required to stabilize fluctuations. The technical effect of stabilizing fluctuations cannot be achieved due to the long time; another existing technical solution is to connect the new energy power generation directly to the energy storage system through the DC bus, and then convert it into AC power through the inverter and merge it into the grid. The fluctuating new energy power is connected in parallel, and the energy storage system charges and discharges with the fluctuation of the new energy power, making the battery of the energy storage system in an uncontrolled operation state, which seriously affects the health and safety of the battery; in addition, when the power grid fails When it is turned on, new energy power grid-connected systems such as photovoltaics, wind power, and tidal power will stop generating power, which reduces system efficiency and increases the risk of instability in new energy power generation and power supply

[0004] One of the technical directions for the industry to solve the above problems in the future is to study and adopt new energy power grid-connected power generation power stabilization control technology based on battery energy storage to solve the impact of new energy power such as photovoltaic, wind power, and tidal power generation on erratic climate. The generation of photoelectric fluctuations and grid failures is a problem that cannot be independently controlled for power supply; for this reason, the present invention proposes a new energy power station system based on energy storage complementary and smooth grid connection, which can effectively solve the problem of stabilizing the fluctuation of new energy power grid connection and realize new Black start and autonomous controlled power supply problems of energy generation systems

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