Hybrid direct current power transmission system weak receiving end power grid voltage control method, device and equipment
Patent Information
- Application Number
- CN202611064100.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-17
- Publication Date
- 2026-10-16
AI Technical Summary
[0005]本发明实施例提供了一种混合直流输电系统弱受端电网电压控制方法、装置及设备，以解决弱受端电网深度电压跌落时，现有的电压控制方法存在无功出力不足，难以有效支撑并网点暂态电压的问题
[0016] This invention provides a method, apparatus, and equipment for controlling the voltage of the weak receiving end of a hybrid DC transmission system. First, under transient voltage control conditions, it relies on splitting dual time scales for rapid response to voltage drops, mitigating the saturation failure problem caused by integral accumulation in traditional single-bandwidth controllers. This allows for rapid calculation and issuance of reactive current commands, shortening the reactive power deployment time after a fault. Second, a current feasible domain is constructed based on four constraints: valve-side AC current, converter transformer capacity, FHMMC modulation ratio, and submodule capacitor voltage. This defines the safe boundaries for the converter's active and reactive power outputs, ensuring that the equipment does not overload during reactive power expansion. Then, an asymmetric reactive power priority limiting correction is applied to the original current command value, reducing active power consumption within the total current limit and prioritizing reactive power output. This releases the wide reactive power regulation range provided by the high modulation ratio of FHMMC, fully exploring its reactive power voltage regulation potential. Finally, the converter adjusts its power based on a safe and optimally regulated current command value, effectively improving the support effect of transient voltage at the grid connection point under weak receiving end fault conditions.