Coordination control system and method for direct-current power grid containing energy storage

Abstract

The invention relates to a coordination control system and method for a direct-current power grid containing energy storage. The control system comprises a sending end control module, an energy storage power station control module, a receiving-end master station control module and a receiving-end slave station control module, wherein each control module generates a PWM pulse signal for controllinga corresponding converter according to the running state of the direct-current power grid containing energy storage and / or the running state of the receiving-end master station of the direct-currentpower grid containing energy storage, and controls the corresponding converter by using the PWM pulse signal. According to the technical scheme, when the system is in a steady state, it can be guaranteed that the direct-current voltage of the system and the power of each receiving end are stable and controllable and free of steady-state errors, all the converters can respond rapidly and when the direct-current power grid breaks down, and the direct-current voltage of the system is kept within a safe value.

Description

technical field [0001] The invention relates to the technical field of electric power transmission and distribution, in particular to a coordinated control system and method for a direct current power grid including energy storage. Background technique [0002] With the depletion of traditional fossil energy and the increasingly prominent environmental problems, the development and utilization of new energy has become an inevitable choice for sustainable development. [0003] However, the output of new energy has randomness and volatility. In order to improve the ability of the power grid to absorb new energy, energy storage devices can be added to the power grid. Using the schedulability and flexible power output capabilities of energy storage devices, effective To stabilize the fluctuation of new energy, therefore, the DC power grid with energy storage is the main means to solve this problem. [0004] The existing control strategy of the DC grid with energy storage focuse...

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Problems solved by technology

[0003] However, the output of new energy has randomness and volatility. In order to improve the ability of the power grid to absorb new energy, energy storage devices can be added to the power grid. Using the schedulability and flexible power output capabilities of energy storage devices, effective To stabilize the fluctuation of new energy, therefore, the DC power grid with energy storage is the main means to solve this problem

[0004] The existing control strategy of the DC grid with energy storage focuses on the control of the energy storage device itself. There is a steady-state error and when the DC grid with energy storage fails, it cannot be controlled so that each converter can quickly participate in the unbalanced power. regulation, prone to DC faults

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