Grid analog power supply
By designing a grid simulation power supply and utilizing power-taking current transformers (CTs), AC/DC converters, and DC/AC modules to simulate a grid with adjustable phase of three-phase voltage, the problem of insufficient performance testing of energy storage converters before delivery was solved, and comprehensive performance testing and reliability verification of the PCS were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHUHAI HENGQIN JIUYUAN POWER ELECTRONICS SCI &TECH CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-07-03
Smart Images
Figure CN224459267U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power grid technology, and in particular to a power grid simulation power supply. Background Technology
[0002] In the energy storage field, energy storage cabinets need to undergo power-on testing before leaving the factory. This is typically done by connecting the energy storage converter (PCS) to the grid and using high voltage. As a device directly connected to the grid, the PCS must withstand harmonics and power surges caused by grid instability. Therefore, the PCS also needs performance testing before leaving the factory to ensure it is not damaged by actual grid power input. This necessitates pre-shipment performance testing of the PCS. Consequently, a device capable of simulating real-world grid scenarios needs to be designed to meet the pre-shipment testing requirements of the PCS. Currently, no systematic device exists to achieve this goal. Utility Model Content
[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a power grid simulation power supply with a simple structure, capable of single-phase or three-phase output and adjustable frequency and phase.
[0004] The technical solution adopted by this utility model is a power grid simulation power supply, including a power-taking CT that draws power from the power grid. An AC / DC module and a DC bus are connected sequentially to the rear end of the power-taking CT. The DC bus is connected to three DC / AC modules respectively. The output terminals of the three DC / AC modules are three independent single-phase outputs, namely phase A, phase B and phase C.
[0005] The voltage output of each phase A, B, and C ranges from 0 to 690V, and the phase of each phase is adjustable.
[0006] The beneficial effects of this utility model are as follows: In this utility model, after the power CT is drawn, the AC to DC conversion is achieved through the first AC / DC module. After passing through the DC bus, the DC to AC conversion is achieved through the three-way DC / AC module, thereby making the three-phase half-bridge output into three independent single-phase outputs. The output voltage range of each phase is 0 to 690V. Since the three outputs are independent and each phase is adjustable, each phase can drive the load 100%, or all three can drive the load simultaneously. Therefore, the three outputs can be adjusted according to the PCS performance test items so that the output power meets the test requirements. In addition, this utility model has a simple structure and both the frequency and phase are adjustable. Attached Figure Description
[0007] Figure 1 This is a simplified structural diagram of the present invention. Detailed Implementation
[0008] like Figure 1 As shown, this utility model includes a power-taking CT2 that draws power from the power grid 1. An AC / DC module 3 and a DC bus 4 are sequentially connected to the rear end of the power-taking CT2. The DC bus 4 is connected to three DC / AC modules 5, each with its own independent single-phase output. These three single-phase outputs are phase A, phase B, and phase C. The voltage range of each phase (A, B, and C) is 0–690V, and the phases of the three phases are adjustable.
[0009] The working principle of this utility model is as follows:
[0010] The power CT2 draws power from the power grid 1, and the AC / DC module 3 converts the AC to DC. After passing through the DC bus 4, the DC is converted back to AC by the three DC / AC modules 5 and then output to the PCS. Finally, the outputs of the three phases A, B, and C are adjusted according to the PCS test requirements to achieve the test of the PCS.
[0011] Finally, it should be emphasized that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A grid emulated power supply comprising a power taking CT (2) taking power from a grid (1), characterized in that, An AC / DC module (3) and a DC bus (4) are sequentially connected to the rear end of the power CT (2). The DC bus (4) is connected to three DC / AC modules (5). The output terminals of the three DC / AC modules (5) are used as three independent single-phase outputs, namely phase A, phase B and phase C.
2. The grid emulated power supply of claim 1, wherein, The voltage output of each phase A, B, and C ranges from 0 to 690V, and the phase of each phase is adjustable.